JP2009099238A - Disk apparatus and adjusting method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set an optimum defocus value, an optimum detrack value, and an optimum tilt value in a disk device and an adjusting method thereof. <P>SOLUTION: A disk device 1 includes: a jitter value detecting circuit 9 detecting a jitter value on the basis of a signal read from a medium M; a setting circuit 21 in which a defocus value used for moving an objective lens 4 along the optical axis direction Df of the objective lens 4 is adjusted, and defocus adjustment is performed on the basis of the defocus value; a setting circuit 22 in which a detrack value used for moving an objective lens 4 along the radial direction Dt of the medium M is adjusted, and detrack adjustment is performed on the basis of the detrack value, and a setting circuit 23 in which the tilt value used for correcting angle deviation of the objective lens 4 with respect to the signal layer Ms of the medium M is adjusted, and tilt adjustment is performed on the basis of the tilt value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc device capable of recording a signal or the like on a medium such as an optical disc by laser light irradiated from an optical pickup device, and reproducing a signal or the like recorded on a medium such as an optical disc by laser light It relates to the adjustment method.

Laser light emitted from an optical pickup device (OPU) of the optical disc apparatus is focused on the signal surface of the optical disc. Laser (LASER) is "light amplification by stimulated
Abbreviation for “emission of radiation”. There are various techniques for focusing laser light on the signal surface of an optical disk, so-called focusing control techniques. In general, focusing control is performed using a signal obtained from a photodetector incorporated in an optical pickup device.

  Focus means, for example, focus or focus. Focusing means focusing or focusing. Further, the defocus adjustment in this specification means an adjustment operation for performing focusing on an object that is not focused, for example.

  A focusing control device that performs a focus pull-in operation reliably in a short time, for example, in an optical disc with different reflectivity depending on the state or a phase change optical disc in which the reflectivity changes due to heat of irradiated light will be described And a focus pull-in method (see, for example, Patent Document 1).

  Further, focusing control is generally performed by a circuit called a focusing servo circuit, and the displacement operation of the objective lens is performed with reference to the position that is the operation center of the objective lens, for example. The servo means, for example, a mechanism that automatically corrects and controls by measuring the state of the object to be controlled and comparing it with a predetermined reference value.

  For example, an arbitrary offset (OFFSET) can be applied by the focus mechanism, and a system that adjusts the jitter (jitter) when reading data from the disc (DISC) is provided by the focus offset (FOCUS_OFFSET), so-called defocus (DEFOCUS) There is a so-called optical pickup device. Jitter means, for example, subtle fluctuations or distortion of a signal.

  For example, there is an optical pickup device in which the position of the operation center of the objective lens is adjusted by detecting a jitter value included in a signal such as a reproduction signal (see, for example, Patent Document 2).

  Normally, in an optical pickup device, an F bias (F BIAS) value, which is a bias (BIAS) value of a focus (FOCUS), is changed so-called defocus value, and the defocus value is set with an optimum jitter value. .

  Further, for example, an optical disc reading apparatus that can obtain a focus bias amount corresponding to an optical disc by detecting a correspondence relationship between a focus bias amount for changing a focus reference position of the pickup and a jitter value of data read by the pickup. (For example, see Patent Document 3).

  Focusing control in the optical disc apparatus is performed using a focusing error signal obtained by a photodetector. When the objective lens is displaced along the direction orthogonal to the surface of the optical disc by focusing control, a focusing error signal called an S-curve is obtained as described in Patent Document 1, for example. Then, when the level of the focusing error signal falls within a focusing control possible range centered on a point called S-shaped curve zero cross, a focusing servo operation is performed and focusing control is performed. By performing the focusing servo operation, the operation of focusing the laser beam irradiated from the laser diode on the signal surface of the optical disc is performed.

  There are various techniques for determining the focal position of laser light on a substantially spiral track provided on the signal surface of an optical disk, so-called tracking control techniques. In general, tracking control is performed using a signal obtained from a photodetector incorporated in an optical pickup device.

  A track in this specification means, for example, a signal trajectory on an optical disc. Further, tracking means that light is used to trace and observe a minute signal portion provided on the signal surface of the optical disc, and the position of the orbit drawn in a substantially spiral shape is determined.

  Explaining what tracking control is described in, for example, rotation that has good information data reading performance even at high-speed rotation of an optical disk with eccentricity and surface runout, and can perform track jump and layer jump stably There are a correction circuit, a semiconductor integrated circuit, an optical disk device, and a rotation correction method (see, for example, Patent Document 4).

  The tracking control is generally performed by a circuit called a tracking servo circuit, and the displacement operation of the objective lens is performed with reference to the position serving as the operation center of the objective lens, for example.

  For example, an arbitrary offset (OFFSET) can be applied by the track mechanism, and a system that adjusts the jitter (jitter) when reading data from the disc (DISC) is equipped by the track offset (TRACK_OFFSET), so-called detrack (DETRACK) There is a so-called optical pickup device.

  Usually, in an optical pickup device, a T-bias (T BIAS) value, which is a bias (BIAS) value of a track (TRACK), is changed, and a de-track value is set with an optimum jitter value. .

  For example, an optical disc apparatus that always sets the track bias amount by arithmetic processing has been considered. In addition, for example, an optical disc apparatus that sets the track bias amount based on the minimum value of the jitter value has been considered.

  In addition, in an optical disc apparatus having a tilt mechanism and a tilt function so far, it has been useful for correcting a skew in a radial direction of a disc and correcting a recording quality. The tilt in the optical disc device or the optical pickup device means an angular deviation between the disc surface and the optical axis of the objective lens. The skew means “distortion” or “bend”.

For example, an arbitrary offset (OFFSET) can be applied by the tilt mechanism, and a system that adjusts the jitter (jitter) when reading data from the disc (DISC) is equipped with the tilt offset (TILE_OFFSET), so-called tilt (TILT). There is also an optical pickup device.

  As an apparatus having a conventional tilt function, for example, when performing tilt control, it is not necessary to add a power supply wire to the lens holder, and the optical head apparatus does not increase the size and weight of the lens holder. (For example, refer to Patent Document 5).

Normally, in an optical pickup device, the tilt value is variable and the tilt value is set with an optimum jitter value. For example, an optical disc apparatus that always sets the tilt bias amount by calculation processing has been considered. Further, for example, an optical disc apparatus that sets the tilt bias amount based on the minimum value of the jitter value has been considered.
JP 2002-342948 A (pages 1, 3-5, FIG. 1-5) Japanese Patent Laid-Open No. 7-262584 (pages 1, 2 and 1-6) Japanese Patent Laid-Open No. 10-228652 (pages 1, 2 and 1-8) Japanese Patent Laid-Open No. 2003-263760 (pages 1, 5 and 1-29) Japanese Patent Laid-Open No. 2002-197698 (pages 1, 2 and 1-3)

  In the conventional optical pickup device, the focal point controlled by the focusing servo operation is not necessarily the best focal point due to the individual difference of the optical pickup device itself or the individual difference of the optical disc, and the focusing servo operation is optimal. There was a problem that it was not done in a bad state.

  In order to solve the above problem, for example, an optical disk reading device disclosed in Patent Document 3 has been proposed. However, in the optical disk reading device disclosed in Patent Document 3, since the focus bias amount is set by, for example, arithmetic processing, there is a concern that the time required for the setting processing becomes long.

  Further, for example, when the method of setting the focus bias amount based on the minimum value of the jitter value is performed, the following problem is concerned. For example, some optical discs used have very little change in jitter value. The bias amount set in the case of such an optical disc may be the focus bias amount at the end of the detection range. When the focus bias amount is set in this way, there is a problem that the focusing servo operation becomes unstable.

  More specifically, when the defocus value is adjusted by the optical pickup device, jitter that is stable even if the jitter value corresponding to the defocus value hardly changes or even if the defocus value is set to 0. There are optical discs that are worthy of. When a defocus value deviated so as to correspond to the optimum jitter is set for such an optical disc, the servo may become unstable due to the defocus value, and so-called defocusing may occur. .

  Defocusing means that, for example, the focal point of the laser beam emitted from the optical pickup device is shifted with respect to the pit portion of the disc being followed, which makes it impossible to read the data recorded on the disc. To do. A pit means a hole or a dent.

For example, when defocus adjustment is performed based on the detected jitter, F drop may occur in an optical pickup device with little jitter change. When defocus adjustment is performed, there is a possibility that the optical pickup device with little jitter change is set with a defocus value that is away from the center value corresponding to the operation center of the objective lens. In the optical pickup device in which such setting is performed, F drop may occur.

  In addition, when a value other than 0 is set as the defocus value when the defocus adjustment is performed in the optical pickup device, the track cannot be captured when the track jump of the optical pickup device to the optical disc is performed. There was a problem that there was.

  Also, in the conventional optical pickup device, the focus position controlled by the tracking servo operation is not necessarily the best focus position due to the individual difference of the optical Bickup device itself or the individual difference of the optical disc. There was a problem that was not performed in the optimal state.

  Further, for example, in an optical disc apparatus that sets the track bias amount by arithmetic processing, the track bias amount is set by arithmetic processing, so there is a concern that the time required for the setting processing becomes long.

  Further, for example, when the method of setting the track bias amount based on the minimum value of the jitter value is performed, the following problem is concerned. For example, some optical discs used have very little change in jitter value. The bias amount set in the case of such an optical disc may be the track bias amount at the end of the detection range. When the track bias amount is set in this way, there is a problem that the tracking servo operation becomes unstable.

  When the detrack value is adjusted by the optical pickup device, when the jitter value corresponding to the detrack value hardly changes or even when the detrack value is set to 0, there is an optical disc that has a stable read jitter value. is there. When a detrack value biased so as to correspond to the optimum jitter is set for such an optical disc, the servo becomes unstable due to the detrack value, and track skipping may occur.

  For example, the track jump means that the focus of the laser beam emitted from the optical pickup device is shifted with respect to the track portion of the disc being followed, which makes it impossible to read the data recorded on the disc. To do.

  For example, when detrack adjustment is performed on the basis of detected jitter, track skipping may occur in an optical pickup device with little jitter change. When detrack adjustment is performed, there is a possibility that the optical pickup apparatus with little jitter change is set with a detrack value that is away from the center value corresponding to the operation center of the objective lens. In the optical pickup device in which such setting is performed, track skipping may occur.

  In addition, if a value other than 0 is set as the detrack value when detrack adjustment is performed in the optical pickup device, the track cannot be captured when the track jump of the optical pickup device to the optical disc is performed. There was a problem that there was.

  Also, in the conventional optical pickup device, the focus position controlled by the tilt operation is not necessarily the best focus position due to the individual difference of the optical pickup device itself or the individual difference of the optical disc, and the tilt operation is optimal. There was a problem that it was not done in a bad state.

  In addition, for example, in an optical disc apparatus that sets the tilt bias amount by arithmetic processing, the tilt bias amount is set by arithmetic processing, so there is a concern that the time required for the setting processing becomes long.

  Further, for example, when the method of setting the tilt bias amount based on the minimum value of the jitter value is performed, the following problem is concerned. For example, some optical discs used have very little change in jitter value. The bias amount set in the case of such an optical disc may be the tilt bias amount at the end of the detection range. When the tilt bias amount is set in this way, there is a problem that the tilt operation becomes unstable.

  When the tilt value is adjusted by the optical pickup device, there is an optical disc in which the jitter value corresponding to the tilt value hardly changes, or even when the tilt value is set to 0, the read jitter value is stable. If a tilt value biased so as to correspond to the optimum jitter is set for such an optical disc, the servo may become unstable due to the tilt value, and servo failure may occur.

  For example, when tilt adjustment is performed on the basis of detected jitter, servo failure may occur in an optical pickup device with little jitter change. When tilt adjustment is performed, there is a possibility that the optical pickup apparatus with little jitter change is set with a tilt value that is away from the center value corresponding to the operation center of the objective lens. In the optical pickup device in which such setting is performed, servo failure may occur.

  In addition, when tilt adjustment is performed in the optical pickup device, if a value other than 0 is set as the tilt value, servo failure is likely to occur when the optical pickup device performs a track jump with respect to the optical disc. was there.

  The present invention is to solve the above-described problems.

  In order to solve the above-described problem, a disk apparatus according to claim 1 of the present invention includes a jitter value detection circuit that detects a jitter value based on a signal read from a medium, and the jitter value detection circuit includes the jitter value detection circuit. When the objective lens is focused on the medium, the defocus value used to move the objective lens along the optical axis direction of the objective lens is adjusted based on the signal that has passed, and the defocus value is adjusted. A setting circuit that performs defocus adjustment based on a focus value; and when the objective lens is focused on the medium based on a signal that has passed through the jitter value detection circuit, the objective lens is placed on the medium. Adjust the detrack value used to move along the radial direction and adjust the detrack based on the detrack value In order to correct an angular deviation of the objective lens with respect to the signal layer of the medium when the objective lens is focused on the medium based on a setting circuit to be performed and a signal that has passed through the jitter value detection circuit And a setting circuit that adjusts a tilt value used in the adjustment and that performs a tilt adjustment based on the tilt value, and at least one setting circuit selected from the group consisting of a setting circuit selected from the group consisting of:

With the above-described configuration, a disk device that can set at least one of an optimal defocus value, an optimal detrack value, and an optimal tilt value is configured. The medium means a medium in which, for example, a signal is stored. Jitter means, for example, subtle fluctuations or distortion of a signal. The focus means, for example, a focus or focus. The defocus adjustment means an adjustment operation for performing focusing on an object that is not focused, for example. The track means, for example, a signal trajectory in the medium. Also,
The detrack adjustment means an adjustment operation for performing track alignment on a medium whose focus is not aligned with the track of the media, for example. Further, the tilt in the disk device means, for example, an angular deviation between the signal layer of the media and the optical axis of the laser light emitted from the optical pickup device. An optimal defocus value is set in the disk device based on the jitter value detected based on the signal read from the medium and the defocus value based on the detected jitter value. Alternatively, an optimum detrack value is set in the disk device based on the jitter value detected based on the signal read from the medium and the detrack value based on the detected jitter value. Alternatively, an optimum tilt value is set in the disk device based on the jitter value detected based on the signal read from the medium and the tilt value based on the detected jitter value.

  According to a second aspect of the present invention, there is provided a method for adjusting a disc device, wherein a disc device including an optical pickup device having an objective lens is used to detect a jitter value of a signal read from a medium, and based on the jitter value. A method of adjusting a disk device for adjusting the position of the objective lens with respect to the medium, wherein when the objective lens is focused with respect to the medium based on the jitter value, the objective lens is moved to the objective lens. A defocus value used to move the lens along the optical axis direction is adjusted, and the focusing adjustment of the objective lens with respect to the medium is performed. At that time, a reference value of the defocus value is set as necessary. Each time the defocus value is changed stepwise within a predetermined range of numerical values, the jitter value is detected, A step of setting an optimum defocus value based on a difference value between a maximum jitter value and a minimum jitter value in each jitter value that is output; and focusing of the objective lens with respect to the medium based on the jitter value To adjust the detrack value used to move the objective lens along the radial direction of the medium, and to adjust the tracking of the objective lens with respect to the medium, and if necessary, The jitter value is detected each time the detrack value is changed stepwise within a predetermined range of values including the reference value of the detrack value, and the maximum jitter value and the minimum jitter of each detected jitter value are detected. A step of setting an optimum detrack value based on a difference value from the value, and based on the jitter value, the objective lens with respect to the medium When performing the alignment, the tilt value used for correcting the angular deviation of the objective lens with respect to the signal layer of the media is adjusted, and the tilt adjustment of the objective lens with respect to the media is performed. If necessary, the jitter value is detected each time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum value of each detected jitter value are detected. At least one of the steps of setting an optimum tilt value based on the difference value from the jitter value is executed.

With the above configuration, at least one of the optimum defocus value, optimum detrack value, and optimum tilt value is set in the disk device. Focusing means focusing or focusing. In addition, tracking means that light is used to trace and observe minute pits, grooves, wobbles, and the like provided on the signal surface portion of the media and determine the position of the orbit drawn in a substantially spiral shape. A pit means a hole or a dent. Further, the groove means an elongated dent. Wobble means meandering of a track on which a data signal such as information is recorded. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the difference from the value, the optimum defocus value is set for the disk device. Or, if necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the reference value of the detrack value, and the maximum jitter value in each detected jitter value Since the optimum detrack value is set based on the difference from the minimum jitter value, the optimum detrack value is set for the disk device. Or, if necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum and minimum jitter values in each detected jitter value are detected. Since the optimum tilt value is set based on the difference value, the optimum tilt value is set for the disk device.

  According to a third aspect of the present invention, there is provided a method of adjusting a disk device, wherein a focusing error signal generated based on a signal detected by a photodetector provided in an optical pickup device is inputted and orthogonal to the surface of the medium. A focusing servo circuit for generating a control signal for displacing the objective lens mounted on the optical pickup device substantially along the optical axis direction, and a tracking generated based on the signal detected by the photodetector A jitter value is detected based on a tracking servo circuit that generates a control signal for displacing the objective lens substantially along the radial direction of the medium, and a signal detected by the photodetector while an error signal is input And a jitter value detection circuit for the medium based on the signal passing through the jitter value detection circuit. When performing focusing of the objective lens, the defocus value used for moving the objective lens along the optical axis direction of the objective lens is adjusted, and the focusing servo is based on the defocus value. A defocus value setting circuit for performing defocus adjustment on the circuit, and when the objective lens is focused on the medium based on a signal that has passed through the jitter value detection circuit, the objective lens is moved to the medium. A detrack value setting circuit for adjusting a detrack value used for moving along the radial direction, and for causing the tracking servo circuit to perform a detrack adjustment based on the detrack value, and the jitter value detection Based on the signal through the circuit, the focus of the objective lens on the media A tilt value setting circuit that adjusts a tilt value used to correct an angular deviation of the objective lens with respect to the signal layer of the media and performs a tilt adjustment based on the tilt value. A disk device adjustment method for adjusting the position of the objective lens with respect to the medium using a disk device, when reading the signal from the medium and detecting the jitter value, if necessary, The jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum jitter value and the minimum jitter value in each detected jitter value are A step of setting an optimum defocus value based on a difference value between the two and a predetermined range including a reference value of the detrack value if necessary. The jitter value is detected each time the detrack value is changed stepwise within the numerical value, and the optimum detrack is determined based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. A step of setting a value and, if necessary, the jitter value is detected each time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and each detected jitter is detected. At least one of the steps of setting an optimum tilt value based on the difference between the maximum jitter value and the minimum jitter value in the value is executed.

With the above configuration, at least one of the optimum defocus value, optimum detrack value, and optimum tilt value is set in the disk device. The servo means a mechanism that automatically corrects and controls by measuring the state of a control target and comparing it with a predetermined reference value. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the difference from the value, the optimum defocus value is set for the disk device. Since an optimum defocus value is set for the disk device, the optical pickup device performs a stable focusing servo operation on the medium. Or, if necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the reference value of the detrack value, and the maximum jitter value in each detected jitter value Since the optimum detrack value is set based on the difference from the minimum jitter value, the optimum detrack value is set for the disk device. Since an optimal detrack value is set for the disk device, the optical pickup device performs a stable tracking servo operation on the medium. Or, if necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum and minimum jitter values in each detected jitter value are detected. Since the optimum tilt value is set based on the difference value, the optimum tilt value is set for the disk device. Since the optimum tilt value is set for the disc device, the optical pickup device performs a stable tilt operation on the medium.

  According to a fourth aspect of the present invention, there is provided a disc apparatus including a jitter value detection circuit that detects a jitter value based on a signal read from a medium, and an objective lens for the medium based on a signal that passes through the jitter value detection circuit. A setting circuit for adjusting a defocus value used for moving the objective lens along the optical axis direction of the objective lens and performing a defocus adjustment based on the defocus value when focusing is performed. At least when the defocus adjustment of the objective lens is performed on the medium, the defocus adjustment is performed within approximately 20 seconds.

  With the above configuration, a disk device capable of setting an optimum defocus value is configured. An optimal defocus value is set in the disk device based on the jitter value detected based on the signal read from the medium and the defocus value based on the detected jitter value. Further, the defocus adjustment is performed in the disk device without waiting for a long time for the defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 20 seconds, so that waiting for a long time for the defocus adjustment performed by the disk device is avoided. The

  According to a fifth aspect of the present invention, there is provided a disc device that detects a jitter value of a signal read from a medium using an optical pickup device having an objective lens, and based on the jitter value, the objective lens for the medium. A disk device for performing position adjustment, for moving the objective lens along the optical axis direction of the objective lens when focusing the objective lens on the medium based on the jitter value The focus adjustment of the objective lens with respect to the medium is performed by adjusting a defocus value to be used, and when necessary, the defocus value is within a predetermined range including a reference value of the defocus value. The jitter value is detected each time the value is changed step by step, and the maximum jitter value in each detected jitter value Based on the value of the difference between the minimum jitter value, characterized in that to set the optimum defocus value within 20 seconds approximately.

  With the above configuration, an optimum defocus value is set for the disk device. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the value of the difference from the value, the optimum defocus value is set for the disk device. Further, the defocus adjustment is performed in the disk device without waiting for a long time for the defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 20 seconds, so that waiting for a long time for the defocus adjustment performed by the disk device is avoided. The

  The disc device according to claim 6 is the disc device according to claim 5, wherein when the defocus adjustment of the objective lens is performed on the medium, a difference value between the maximum jitter value and the minimum jitter value is obtained. The defocus value corresponding to the minimum jitter value is set as the optimum defocus value when the value is larger than a predetermined value.

With the above configuration, the optical pickup device that constitutes the disk device performs a stable focusing servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium with poor jitter characteristics, the defocus value corresponding to the minimum jitter value is set as the optimum defocus value, so that a stable focusing servo operation is executed by the optical pickup device.

  The disc device according to claim 7 is the disc device according to claim 5 or 6, wherein when the defocus adjustment of the objective lens is performed on the medium, a difference between the maximum jitter value and the minimum jitter value is obtained. When the value is smaller than a predetermined value, the reference value of the defocus value is set as the optimum defocus value.

  With the above configuration, the optical pickup device constituting the disk device performs stable focusing servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the disc device is set with the reference value of the defocus value as the optimum defocus value, so that stable focusing is possible without causing any trouble in the focusing servo operation of the optical pickup device. Servo operation is executed by the optical pickup device.

  The disc device according to claim 8 is the disc device according to any one of claims 5 to 7, wherein the defocus adjustment of the objective lens is performed on the medium within about 15 seconds. Focus adjustment is performed.

  With the above configuration, the defocus adjustment is performed in the disk device without waiting for a long time for the defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 15 seconds, so that waiting for a long time for the defocus adjustment performed by the disk device is avoided. The

  The disc device according to claim 9 is the disc device according to any one of claims 5 to 8, wherein when the defocus adjustment of the objective lens is performed on the medium, the defocus value is first set. The jitter value is detected based on the reference value, and the predetermined value including the reference value of the defocus value when the detected jitter value is larger than a predetermined jitter value determined in advance. The jitter value is detected each time the defocus value is changed stepwise within a numerical value in the range.

  With the above configuration, an optimum defocus value corresponding to the medium is set in the disk device. When defocus adjustment of the objective lens is performed on the medium, first, a jitter value based on a defocus value reference value is detected. A medium in which a jitter value based on a defocus value reference value is larger than a predetermined predetermined jitter value is a medium that needs to investigate each jitter value corresponding to each defocus value. . When the jitter value based on the detected defocus value reference value is larger than a predetermined predetermined jitter value, defocusing is performed within a predetermined range of values including the defocus value reference value. Each time the value is changed step by step, the jitter value is detected, and the optimum defocus value corresponding to the media is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. .

The disc device according to claim 10 is the disc device according to any one of claims 5 to 9, wherein when the defocus adjustment of the objective lens is performed on the medium, the defocus value is first set. The jitter value is detected based on the reference value, and the predetermined value including the reference value of the defocus value when the detected jitter value is smaller than a predetermined jitter value determined in advance. The reference value of the defocus value is set as the optimum defocus value without detecting the jitter value every time the defocus value is changed stepwise within a numerical value in a range. .

  With the above configuration, when a medium with good jitter characteristics is used, the defocus value is quickly set, and the optical pickup device constituting the disk device performs stable focusing servo operation on the medium. It will be. When defocus adjustment of the objective lens is performed on the medium, first, a jitter value based on a defocus value reference value is detected. A medium whose jitter value based on the defocus value reference value is smaller than a predetermined jitter value is determined as a medium having good jitter characteristics. When a signal is read out from a medium with good jitter characteristics, the defocus value is not detected every time the defocus value is changed stepwise within a predetermined range of values including the reference value of the defocus value. Since the reference value is set as the optimum defocus value, the setting time of the defocus value is shortened. In addition, when a signal is read from a medium with good jitter characteristics, the reference value of the defocus value is set to the disk device as the optimum defocus value, so that the focusing servo operation of the optical pickup device does not cause a problem and is stable. The focusing servo operation is executed by the optical pickup device.

  The disc device according to claim 11 is the disc device according to any one of claims 5 to 10, wherein the optimum defocus value is set to the numerical value other than the reference value. On the other hand, when the optical pickup device performs a track jump, the defocus value is set to the reference value.

  With the above configuration, even if a numerical value other than the reference value is set as the optimum defocus value in the disk device, the track jump of the optical pickup device with respect to the medium is performed well. When the defocus adjustment of the optical pickup device with respect to the media is performed and the defocus value is set to a value other than the reference value, the track capture is performed when the track jump of the optical pickup device with respect to the media is performed. There was something I couldn't do. However, even when the defocus value is set to a value other than the reference value, when the optical pickup device performs a track jump, by setting the defocus value to the reference value, the optical type for the medium is set. The track jump of the pickup device is likely to be normally performed.

  The disc device according to claim 12 is the disc device according to claim 11, wherein the defocus value is set to the numerical value other than the reference value after the track jump of the optical pickup device with respect to the medium is completed. It is characterized by returning.

  With the above configuration, a defocus value optimum for the disk device is set again. When the track jump of the optical pickup device is not performed on the media, the numerical value other than the defocus value reference value is again set to the disc device as the optimum defocus value. Done well.

According to a thirteenth aspect of the present invention, there is provided a disc apparatus including a jitter value detection circuit that detects a jitter value based on a signal read from a medium, and an objective lens for the medium based on a signal that has passed through the jitter value detection circuit. A setting circuit for adjusting a detrack value used for moving the objective lens along a radial direction of the medium when focusing is performed, and for performing a detrack adjustment based on the detrack value; When the detrack adjustment of the objective lens is performed on the medium, the detrack adjustment is performed within approximately 20 seconds.

  With the above configuration, a disk device capable of setting an optimum detrack value is configured. An optimum detrack value is set in the disk device based on the jitter value detected based on the signal read from the medium and the detrack value based on the detected jitter value. Further, the detrack adjustment is performed in the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 20 seconds, so that waiting for a long time for the detrack adjustment performed by the disk device is avoided. The

  According to a fourteenth aspect of the present invention, there is provided a disc device that detects a jitter value of a signal read from a medium using an optical pickup device having an objective lens, and based on the jitter value, the objective lens with respect to the medium. A disk device for performing position adjustment, wherein the objective lens is moved along the radial direction of the medium when the objective lens is focused on the medium based on the jitter value. The tracking value is adjusted to perform tracking adjustment of the objective lens with respect to the medium. At that time, if necessary, the detrack value is set within a predetermined range including the reference value of the detrack value. The jitter value is detected every time it is changed step by step, and the maximum jitter value and the minimum jitter value of each detected jitter value are detected. Based on the value of the difference between the value, characterized in that to set the optimum detrack value within 20 seconds approximately.

  With the above configuration, an optimum detrack value is set for the disk device. If necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum detrack value is set based on the difference from the value, the optimum detrack value is set for the disk device. Further, the detrack adjustment is performed in the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 20 seconds, so that waiting for a long time for the detrack adjustment performed by the disk device is avoided. The

  The disc device according to claim 15 is the disc device according to claim 14, wherein the difference between the maximum jitter value and the minimum jitter value is determined when detrack adjustment of the objective lens is performed on the medium. When the value is larger than a predetermined value, the detrack value corresponding to the minimum jitter value is set as the optimum detrack value.

  With the above configuration, the optical pickup device constituting the disk device performs a stable tracking servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium with poor jitter characteristics, the detrack value corresponding to the minimum jitter value is set as the optimum detrack value, so that a stable tracking servo operation is executed by the optical pickup device.

  The disc device according to claim 16 is the disc device according to claim 14 or 15, wherein the difference between the maximum jitter value and the minimum jitter value is determined when the medium is detracked by the objective lens. When the value is smaller than a predetermined value, the reference value of the detrack value is set as the optimum detrack value.

With the above configuration, the optical pickup device constituting the disk device performs a stable tracking servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the detrack value reference value is set to the disk device as the optimal detrack value, so that stable tracking is possible without causing any trouble in the tracking servo operation of the optical pickup device. Servo operation is executed by the optical pickup device.

  The disc device according to claim 17 is the disc device according to any one of claims 14 to 16, wherein the detrack adjustment of the objective lens is performed on the medium within about 15 seconds. The track adjustment is performed.

  With the above configuration, the detrack adjustment is performed in the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 15 seconds. Therefore, it is possible to avoid waiting for a long time for the detrack adjustment performed by the disk device. The

  The disc device according to claim 18 is the disc device according to any one of claims 14 to 17, wherein when the detrack adjustment of the objective lens is performed on the medium, the detrack value is first set. The jitter value is detected based on the reference value, and the predetermined value including the reference value of the detrack value when the detected jitter value is larger than a predetermined jitter value determined in advance. The jitter value is detected each time the detrack value is changed stepwise within a numerical value in the range.

  With the above configuration, an optimal detrack value corresponding to the medium is set in the disk device. When detrack adjustment of the objective lens is performed on the medium, first, a jitter value based on a reference value of the detrack value is detected. A medium whose jitter value based on the reference value of the detrack value is larger than a predetermined jitter value is determined as a medium for which it is necessary to investigate each jitter value corresponding to each detrack value. . When the jitter value based on the detected detrack value reference value is larger than a predetermined jitter value, the detrack value is within a predetermined range including the detrack value reference value. Each time the value is changed step by step, the jitter value is detected, and the optimum detrack value corresponding to the media is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. .

  The disc device according to claim 19 is the disc device according to any one of claims 14 to 18, wherein when the detrack adjustment of the objective lens is performed on the medium, the detrack value is first set. The jitter value is detected based on the reference value, and the predetermined value including the reference value of the detrack value when the detected jitter value is smaller than a predetermined jitter value determined in advance. The reference value of the detrack value is set as the optimum detrack value without causing the jitter value to be detected every time the detrack value is changed stepwise within a numerical value in a range. .

With the above configuration, when a medium with good jitter characteristics is used, the detrack value is set quickly, and the optical pickup device constituting the disk device performs a stable tracking servo operation on the medium. It will be. When detrack adjustment of the objective lens is performed on the medium, first, a jitter value based on a reference value of the detrack value is detected. A medium in which the jitter value based on the reference value of the detrack value is set to a small value equal to or smaller than a predetermined jitter value is a medium having good jitter characteristics. When a signal is read out from a medium having good jitter characteristics, the detrack value is not detected every time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value. Since the reference value is set as the optimum detrack value, the setting time of the detrack value is shortened. In addition, when a signal is read out from a medium with good jitter characteristics, the reference value of the detrack value is set in the disk device as the optimum detrack value, so that the tracking servo operation of the optical pickup device does not cause a problem and is stable. The tracking servo operation thus performed is executed by the optical pickup device.

  A disk device according to a twentieth aspect is the disk device according to any one of the fourteenth to nineteenth aspects, wherein the optimum detrack value is set to the numerical value other than the reference value when the medium is used. On the other hand, when the optical pickup device performs a track jump, the detrack value is set to the reference value.

  With the above configuration, even if a numerical value other than the reference value is set as the optimum detrack value in the disk device, the track jump of the optical pickup device with respect to the medium is performed well. When the detrack adjustment of the optical pickup device with respect to the media is performed and the detrack value is set to a value other than the reference value, the track capture is performed when the track jump of the optical pickup device with respect to the media is performed. There was something I couldn't do. However, even when the detrack value is set to a value other than the reference value, when the optical pickup device performs a track jump, the detrack value is set to the reference value, so that the optical type for the medium is set. The track jump of the pickup device is likely to be normally performed.

  The disc device according to claim 21 is the disc device according to claim 20, wherein the detrack value is set to the numerical value other than the reference value after the track jump of the optical pickup device with respect to the medium is completed. It is characterized by returning.

  With the above configuration, the optimum detrack value for the disk device is set again. When a track jump of the optical pickup device is not performed on the medium, a numerical value other than the reference value of the detrack value is set again as an optimal detrack value in the disk device. Done well.

  A disc apparatus according to claim 22 is a jitter value detection circuit that detects a jitter value based on a signal read from a medium, and an objective lens for the medium based on a signal that has passed through the jitter value detection circuit. A setting circuit that adjusts a tilt value used to correct an angular deviation of the objective lens with respect to a signal layer of the medium when focusing is performed, and performs a tilt adjustment based on the tilt value; At least, when the tilt adjustment of the objective lens is performed on the medium, the tilt adjustment is performed within approximately 20 seconds.

  With the above configuration, a disk device capable of setting an optimum tilt value is configured. An optimal tilt value is set in the disk device based on the jitter value detected based on the signal read from the medium and the tilt value based on the detected jitter value. Further, the tilt adjustment is performed in the disk device without waiting for a long time for the tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 20 seconds, so that waiting for a long time for the tilt adjustment performed by the disk device is avoided.

According to a twenty-third aspect of the present invention, there is provided a disc device that detects a jitter value of a signal read from a medium by using an optical pickup device having an objective lens, and based on the jitter value, detects the jitter value of the objective lens for the medium. A disk device for performing position adjustment, for correcting an angular shift of the objective lens with respect to a signal layer of the medium when the objective lens is focused on the medium based on the jitter value The tilt value to be used is adjusted, and the tilt adjustment of the objective lens with respect to the medium is performed. At that time, the tilt value is adjusted within a predetermined range including the reference value of the tilt value, if necessary. The jitter value is detected every time the change is made, and the maximum jitter value and the minimum jitter value of each detected jitter value are detected. Based on the value of the difference, characterized in that to set the optimum tilt value within 20 seconds approximately.

  With the above configuration, an optimum tilt value is set for the disk device. If necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum jitter value in each detected jitter value are determined. Since the optimum tilt value is set based on the difference value, the optimum tilt value is set for the disk device. Further, the tilt adjustment is performed in the disk device without waiting for a long time for the tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 20 seconds, so that waiting for a long time for the tilt adjustment performed by the disk device is avoided.

  The disc device according to claim 24 is the disc device according to claim 23, wherein when the tilt adjustment of the objective lens is performed on the medium, a difference value between the maximum jitter value and the minimum jitter value is obtained. The tilt value corresponding to the minimum jitter value is set as the optimum tilt value when the value is larger than a predetermined value.

  With the above configuration, the optical pickup device constituting the disk device performs a stable tilt operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium having poor jitter characteristics, the tilt value corresponding to the minimum jitter value is set as the optimum tilt value, so that a stable tilt operation is executed by the optical pickup device.

  The disc device according to claim 25 is the disc device according to claim 23 or 24, wherein when the tilt adjustment of the objective lens is performed on the medium, the difference between the maximum jitter value and the minimum jitter value is calculated. The reference value of the tilt value is set as the optimum tilt value when the value is smaller than a predetermined value.

  With the above configuration, the optical pickup device constituting the disk device performs a stable tilt operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read out from a medium with good jitter characteristics, the disc device is set with the reference value of the tilt value as the optimum tilt value, so there is no problem with the tilt operation of the optical pickup device, and stable tilt operation is optical. It is executed by the type pickup device.

  The disk device according to claim 26 is the disk device according to any one of claims 23 to 25, wherein the tilt adjustment is performed within approximately 15 seconds when the tilt adjustment of the objective lens is performed on the medium. It is characterized by making it carry out.

  With the above configuration, the tilt adjustment is performed in the disk device without waiting for a long time for the tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 15 seconds, so that waiting for a long time for the tilt adjustment performed by the disk device is avoided.

A disk device according to a twenty-seventh aspect is the disk device according to any one of the twenty-third to twenty-sixth aspects, wherein when the medium is tilt-adjusted with respect to the medium, the reference of the tilt value is first set. The jitter value is detected based on a value, and when the detected jitter value is larger than a predetermined jitter value, a numerical value in the predetermined range including the reference value of the tilt value The jitter value is detected each time the tilt value is changed stepwise.

  With the above configuration, the optimum tilt value corresponding to the medium is set in the disk device. When the tilt adjustment of the objective lens is performed on the medium, first, a jitter value based on the reference value of the tilt value is detected. A medium in which the jitter value based on the reference value of the tilt value is larger than a predetermined jitter value is determined as a medium that needs to investigate each jitter value corresponding to each tilt value. When the jitter value based on the detected reference value of the tilt value is larger than a predetermined predetermined jitter value, the tilt value is stepped within a predetermined range of values including the reference value of the tilt value. Each time a change is made, the jitter value is detected, and an optimum tilt value corresponding to the medium is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value.

  A disk apparatus according to a twenty-eighth aspect is the disk apparatus according to any one of the twenty-third to twenty-seventh aspects, wherein when the medium is tilt-adjusted with respect to the medium, the reference of the tilt value is first set. The jitter value is detected based on a value, and when the detected jitter value is smaller than a predetermined jitter value, a numerical value in the predetermined range including the reference value of the tilt value The reference value of the tilt value is set as the optimum tilt value without detecting the jitter value every time the tilt value is changed step by step.

  With the above configuration, when a medium with good jitter characteristics is used, the tilt value is set quickly, and the optical pickup device constituting the disk device performs a stable tilt operation on the medium. Become. When the tilt adjustment of the objective lens is performed on the medium, first, a jitter value based on the reference value of the tilt value is detected. A medium in which the jitter value based on the reference value of the tilt value is set to a small value equal to or smaller than a predetermined jitter value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the tilt value reference value can be set without detecting the jitter value every time the tilt value is changed stepwise within a predetermined range of values including the tilt value reference value. Since the optimum tilt value is set, the time for setting the tilt value is shortened. In addition, when a signal is read from a medium with good jitter characteristics, the disc device is set with the reference value of the tilt value as the optimum tilt value. Is executed by the optical pickup device.

  A disk apparatus according to a twenty-ninth aspect is the disk apparatus according to any one of the twenty-third to twenty-eighth aspects, wherein the optimum tilt value is set to the numerical value other than the reference value, and the medium is The tilt value is set to the reference value when the optical pickup device performs a track jump.

  With the above configuration, even if a numerical value other than the reference value is set as the optimum tilt value in the disk device, the track jump of the optical pickup device with respect to the medium can be performed satisfactorily. If the tilt adjustment of the optical pickup device with respect to the media is performed and the tilt value is set to a value other than the reference value, the servo failure is likely to occur when the track jump of the optical pickup device with respect to the media is performed. It was. However, even when the tilt value is set to a value other than the reference value, when the optical pickup device performs track jump, the tilt value is set to the reference value, so that the optical pickup device for the medium is set. The track jump is easily performed normally.

  The disc device according to claim 30 is the disc device according to claim 29, wherein the tilt value is returned to the numerical value other than the reference value after the track jump of the optical pickup device with respect to the medium is completed. It is characterized by that.

  With the above configuration, the optimum tilt value for the disk device is set again. When the track jump of the optical pickup device is not performed on the media, the numerical value other than the reference value of the tilt value is set again to the disc device as the optimum tilt value. Done.

  The disk device according to claim 31 is the disk device according to any one of claims 5 to 12, wherein the disk device according to any one of claims 14 to 21 and / or Any one of the disk devices described in any one of the items is merged.

  With the above configuration, it is possible to provide a disk device that can set an optimal detrack value and / or an optimal tilt value in a relatively short time in addition to an optimal defocus value.

  As described above, according to the first aspect of the present invention, a disk device capable of setting at least one of the optimum defocus value, optimum detrack value, and optimum tilt value is configured. Can do. Based on the jitter value detected based on the signal read from the medium and the defocus value based on the detected jitter value, an optimum defocus value can be set in the disk device. Alternatively, the optimal detrack value can be set in the disk device based on the jitter value detected based on the signal read from the medium and the detrack value based on the detected jitter value. Alternatively, the optimal tilt value can be set in the disk device based on the jitter value detected based on the signal read from the medium and the tilt value based on the detected jitter value.

  According to the second aspect of the present invention, at least one of the optimum defocus value, optimum detrack value, and optimum tilt value can be set in the disk device. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the value of the difference from the value, the optimum defocus value can be set in the disk device. Or, if necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the reference value of the detrack value, and the maximum jitter value in each detected jitter value Since the optimum detrack value is set based on the difference value from the minimum jitter value, the optimum detrack value can be set in the disk device. Or, if necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum jitter of each detected jitter value are detected. Since the optimum tilt value is set based on the value of the difference from the value, the optimum tilt value can be set in the disk device.

According to the third aspect of the present invention, at least one of the optimum defocus value, optimum detrack value, and optimum tilt value can be set in the disk device. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the value of the difference from the value, the optimum defocus value can be set in the disk device. Since an optimum defocus value is set for the disk device, the optical pickup device performs a stable focusing servo operation on the medium. Or, if necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the reference value of the detrack value, and the maximum jitter value in each detected jitter value Since the optimum detrack value is set based on the difference value from the minimum jitter value, the optimum detrack value can be set in the disk device. Since an optimal detrack value is set for the disk device, the optical pickup device performs a stable tracking servo operation on the medium. Or, if necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum jitter of each detected jitter value are detected. Since the optimum tilt value is set based on the value of the difference from the value, the optimum tilt value can be set in the disk device. Since the optimum tilt value is set for the disc device, the optical pickup device performs a stable tilt operation on the medium.

  According to the fourth aspect of the present invention, it is possible to configure a disk device capable of setting an optimum defocus value. Based on the jitter value detected based on the signal read from the medium and the defocus value based on the detected jitter value, an optimum defocus value can be set in the disk device. In addition, it is possible to cause the disk device to perform defocus adjustment without waiting for a long time for defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 20 seconds, thereby avoiding waiting for a long time for the defocus adjustment performed by the disk device. be able to.

  According to the fifth aspect of the present invention, the optimum defocus value can be set in the disk device. If necessary, the jitter value is detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum defocus value is set based on the value of the difference from the value, the optimum defocus value can be set in the disk device. In addition, it is possible to cause the disk device to perform defocus adjustment without waiting for a long time for defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 20 seconds, thereby avoiding waiting for a long time for the defocus adjustment performed by the disk device. be able to.

  According to the sixth aspect of the present invention, the optical pickup device constituting the disk device performs a stable focusing servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium with poor jitter characteristics, the defocus value corresponding to the minimum jitter value is set as the optimum defocus value, so that a stable focusing servo operation can be executed by the optical pickup device.

  According to the seventh aspect of the present invention, the optical pickup device constituting the disk device performs a stable focusing servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read out from a medium with good jitter characteristics, the defocus value reference value is set to the disc device as the optimum defocus value, so that the focusing servo operation of the optical pick-up device is stable and stable. The focusing servo operation can be executed by the optical pickup device.

  According to the eighth aspect of the invention, the defocus adjustment is performed in the disk device without waiting for a long time for the defocus adjustment. When the defocus adjustment of the objective lens with respect to the medium is performed, the defocus adjustment is performed within approximately 15 seconds, thereby avoiding waiting for a long time for the defocus adjustment performed by the disk device. be able to.

  According to the ninth aspect of the present invention, the optimum defocus value corresponding to the medium can be set in the disk device. When defocus adjustment of the objective lens is performed on the medium, first, a jitter value based on a defocus value reference value is detected. A medium in which a jitter value based on a defocus value reference value is larger than a predetermined predetermined jitter value is a medium that needs to investigate each jitter value corresponding to each defocus value. . When the jitter value based on the detected defocus value reference value is larger than a predetermined predetermined jitter value, defocusing is performed within a predetermined range of values including the defocus value reference value. Each time the value is changed step by step, the jitter value is detected, and the optimum defocus value corresponding to the media is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. .

  According to the tenth aspect of the present invention, when a medium having good jitter characteristics is used, the defocus value can be set quickly, and the optical pickup device constituting the disk device can be used as a medium. In contrast, stable focusing servo operation is performed. When defocus adjustment of the objective lens is performed on the medium, first, a jitter value based on a defocus value reference value is detected. A medium whose jitter value based on the defocus value reference value is smaller than a predetermined jitter value is determined as a medium having good jitter characteristics. When a signal is read out from a medium with good jitter characteristics, the defocus value is not detected every time the defocus value is changed stepwise within a predetermined range of values including the reference value of the defocus value. Since the reference value is set as the optimum defocus value, the setting time of the defocus value can be shortened. In addition, when a signal is read from a medium with good jitter characteristics, the reference value of the defocus value is set in the disk device as an optimum defocus value, so that the focusing servo operation of the optical pickup device does not cause a problem. A stable focusing servo operation can be executed by the optical pickup device.

  According to the eleventh aspect of the present invention, even when a numerical value other than the reference value is set as the optimum defocus value in the disk device, the track jump of the optical pickup device with respect to the medium can be favorably performed. When the defocus adjustment of the optical pickup device with respect to the media is performed and the defocus value is set to a value other than the reference value, the track capture is performed when the track jump of the optical pickup device with respect to the media is performed. There was something I couldn't do. However, even when the defocus value is set to a value other than the reference value, when the optical pickup device performs a track jump, by setting the defocus value to the reference value, the optical type for the medium is set. The track jump of the pickup device can be easily performed normally.

  According to the twelfth aspect of the present invention, the optimum defocus value can be set again for the disk device. When the track jump of the optical pickup device is not performed on the media, the numerical value other than the defocus value reference value is again set to the disc device as the optimum defocus value, so the focusing adjustment of the objective lens with respect to the media is good Can be done.

According to the thirteenth aspect of the present invention, it is possible to configure a disk device capable of setting an optimum detrack value. Based on the jitter value detected based on the signal read from the medium and the detrack value based on the detected jitter value, an optimal detrack value can be set in the disk device. Further, the detrack adjustment can be performed by the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 20 seconds, thereby avoiding waiting for a long time for the detrack adjustment performed by the disk device. be able to.

  According to the fourteenth aspect of the present invention, the optimum detrack value can be set in the disk device. If necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value, and the maximum and minimum jitter values for each detected jitter value are detected. Since the optimum detrack value is set based on the difference value, the optimum detrack value can be set in the disk device. Further, the detrack adjustment can be performed by the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 20 seconds, thereby avoiding waiting for a long time for the detrack adjustment performed by the disk device. be able to.

  According to the invention described in claim 15, the optical pickup device constituting the disk device performs a stable tracking servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium having poor jitter characteristics, the detrack value corresponding to the minimum jitter value is set as the optimum detrack value, so that a stable tracking servo operation can be executed by the optical pickup device.

  According to the sixteenth aspect of the present invention, the optical pickup device constituting the disk device performs a stable tracking servo operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the reference value of the detrack value is set in the disk device as the optimum detrack value, so that the tracking operation of the optical pickup device is stable and stable. The tracking servo operation can be executed by the optical pickup device.

  According to the seventeenth aspect of the present invention, the detrack adjustment is performed in the disk device without waiting for a long time for the detrack adjustment. When the detrack adjustment of the objective lens with respect to the medium is performed, the detrack adjustment is performed within approximately 15 seconds, thereby avoiding waiting for a long time for the detrack adjustment performed by the disk device. be able to.

  According to the eighteenth aspect, the optimum detrack value corresponding to the medium can be set in the disk device. When detrack adjustment of the objective lens is performed on the medium, first, a jitter value based on a reference value of the detrack value is detected. A medium whose jitter value based on the reference value of the detrack value is larger than a predetermined jitter value is determined as a medium for which it is necessary to investigate each jitter value corresponding to each detrack value. . When the jitter value based on the detected detrack value reference value is larger than a predetermined jitter value, the detrack value is within a predetermined range including the detrack value reference value. Each time the value is changed step by step, the jitter value is detected, and the optimum detrack value corresponding to the media is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. .

According to the nineteenth aspect of the present invention, when a medium having good jitter characteristics is used, the detrack value can be set quickly, and the optical pickup device constituting the disk device can be used as a medium. On the other hand, stable tracking servo operation is performed. When detrack adjustment of the objective lens is performed on the medium, first, a jitter value based on a reference value of the detrack value is detected. A medium in which the jitter value based on the reference value of the detrack value is set to a small value equal to or smaller than a predetermined jitter value is a medium having good jitter characteristics. When a signal is read out from a medium with good jitter characteristics, the detrack value is not detected every time the detrack value is changed stepwise within a predetermined range of values including the detrack value reference value. Since the reference value is set as the optimum detrack value, the setting time of the detrack value can be shortened. In addition, when a signal is read from a medium having good jitter characteristics, the reference value of the detrack value is set in the disk device as the optimum detrack value, so that the tracking servo operation of the optical pickup device does not cause a problem A stable tracking servo operation can be executed by the optical pickup device.

  According to the twentieth aspect of the present invention, even if a numerical value other than the reference value is set as the optimum detrack value in the disk device, the track jump of the optical pickup device with respect to the medium can be favorably performed. When the detrack adjustment of the optical pickup device with respect to the media is performed and the detrack value is set to a value other than the reference value, the track capture is performed when the track jump of the optical pickup device with respect to the media is performed. There was something I couldn't do. However, even when the detrack value is set to a value other than the reference value, when the optical pickup device performs a track jump, the detrack value is set to the reference value, so that the optical type for the medium is set. The track jump of the pickup device can be easily performed normally.

  According to the twenty-first aspect, the optimum detrack value can be set again for the disk device. When the track jump of the optical pickup device is not performed for the media, the numerical value other than the reference value of the detrack value is set to the disc device as the optimum detrack value again, so the tracking adjustment of the objective lens for the media is good Can be done.

  According to the twenty-second aspect of the present invention, it is possible to configure a disk device capable of setting an optimum tilt value. Based on the jitter value detected based on the signal read from the medium and the tilt value based on the detected jitter value, an optimal tilt value can be set in the disk device. Further, it is possible to cause the disk device to perform tilt adjustment without waiting for a long time for tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 20 seconds, so that it is possible to avoid waiting for a long time for the tilt adjustment performed by the disk device. .

  According to the twenty-third aspect of the present invention, the optimum tilt value can be set in the disk device. If necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum jitter value in each detected jitter value are determined. Since the optimum tilt value is set based on the difference value, the disc device can be set with the optimum tilt value. Further, it is possible to cause the disk device to perform tilt adjustment without waiting for a long time for tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 20 seconds, so that it is possible to avoid waiting for a long time for the tilt adjustment performed by the disk device. .

  According to the twenty-fourth aspect of the present invention, the optical pickup device constituting the disk device performs a stable tilt operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is larger than a predetermined value is determined as a medium having poor jitter characteristics. When a signal is read from a medium having poor jitter characteristics, the tilt value corresponding to the minimum jitter value is set as the optimum tilt value, so that a stable tilt operation can be executed by the optical pickup device.

  According to the twenty-fifth aspect of the present invention, the optical pickup device constituting the disk device performs a stable tilt operation on the medium. A medium in which the difference between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the disc device is set with the reference value of the tilt value as the optimum tilt value, so that stable tilt operation can be performed without causing problems in the tilt operation of the optical pickup device. The optical pickup device can be executed.

  According to the twenty-sixth aspect of the present invention, the tilt adjustment is performed in the disk device without waiting for a long time for the tilt adjustment. When the tilt adjustment of the objective lens with respect to the medium is performed, the tilt adjustment is performed within approximately 15 seconds, so that it is possible to avoid waiting for a long time for the tilt adjustment performed by the disk device. .

  According to the twenty-seventh aspect, the optimum tilt value corresponding to the medium can be set in the disk device. When the tilt adjustment of the objective lens is performed on the medium, first, a jitter value based on the reference value of the tilt value is detected. A medium in which the jitter value based on the reference value of the tilt value is larger than a predetermined jitter value is determined as a medium that needs to investigate each jitter value corresponding to each tilt value. When the jitter value based on the detected reference value of the tilt value is larger than a predetermined predetermined jitter value, the tilt value is stepped within a predetermined range of values including the reference value of the tilt value. Each time a change is made, the jitter value is detected, and an optimum tilt value corresponding to the medium is set based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value.

  According to the invention of claim 28, when a medium having good jitter characteristics is used, the tilt value can be quickly set, and the optical pickup device constituting the disk device can , Perform a stable tilt operation. When the tilt adjustment of the objective lens is performed on the medium, first, a jitter value based on the reference value of the tilt value is detected. A medium in which the jitter value based on the reference value of the tilt value is set to a small value equal to or smaller than a predetermined jitter value is a medium having good jitter characteristics. When a signal is read from a medium with good jitter characteristics, the tilt value reference value can be set without detecting the jitter value every time the tilt value is changed stepwise within a predetermined range of values including the tilt value reference value. Since the optimum tilt value is set, the time for setting the tilt value can be shortened. In addition, when a signal is read from a medium with good jitter characteristics, the disc device is set with the reference value of the tilt value as the optimum tilt value, so that stable tilt without causing any trouble in the tilt operation of the optical pickup device The operation can be executed by the optical pickup device.

  According to the twenty-ninth aspect of the present invention, even when a numerical value other than the reference value is set as the optimum tilt value in the disk device, the track jump of the optical pickup device with respect to the medium can be favorably performed. If the tilt adjustment of the optical pickup device with respect to the media is performed and the tilt value is set to a value other than the reference value, the servo failure is likely to occur when the track jump of the optical pickup device with respect to the media is performed. It was. However, even when the tilt value is set to a value other than the reference value, when the optical pickup device performs track jump, the tilt value is set to the reference value, so that the optical pickup device for the medium is set. It is possible to facilitate the normal track jump.

According to the invention of claim 30, the optimum tilt value can be set again in the disk device. When the optical pickup device track jump is not performed on the media, the numerical value other than the reference value of the tilt value is set again to the disc device as the optimum tilt value, so that the tilt adjustment of the objective lens with respect to the media is performed well. Can be made.

  According to the invention of claim 31, it is possible to provide a disk device capable of setting an optimum detrack value and / or an optimum tilt value in a relatively short time in addition to an optimum defocus value. it can.

  An embodiment of a disk device and an adjustment method thereof according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an embodiment of a disk device according to the present invention, FIG. 2 is an explanatory diagram showing the operating state of a surface runout disk used as a medium installed in the disk device, and FIG. FIG. 4 shows the operating state of an eccentric disk used as a medium installed in the disk device, and FIG. 4 (A) shows the state of the eccentric disk. FIG. 5B is an explanatory diagram showing a state in which the objective lens is tilted toward the outer peripheral side of the disc, FIG. 5B is an explanatory diagram showing a state in which the objective lens is tilted toward the inner peripheral side of the eccentric disc, and FIG. It is a wave form diagram which shows the rocking | fluctuation period when the eccentric disk made into is rotated.

  An optical disc apparatus 1 shown in FIG. 1 is configured to be able to set a defocus value suitable for performing a focusing servo operation using a jitter value of a signal obtained from a medium M such as an optical disc M. Further, the optical disc apparatus 1 shown in FIG. 1 is configured to be able to set a detrack value suitable for performing a tracking servo operation using a jitter value of a signal obtained from a medium M such as an optical disc M. Yes. The optical disc apparatus 1 shown in FIG. 1 is configured so that a tilt value suitable for performing a tilt operation can be set using a jitter value of a signal obtained from a medium M such as an optical disc M.

  As described above, jitter means, for example, subtle fluctuations or distortion of a signal. Further, the focus means, for example, a focus or focus. Focusing means, for example, focusing or focusing. The tracking is, for example, using light to track and observe minute pits (holes, dents), grooves (grooves), wobbles (meanders) provided on the signal surface portion Ms of the optical disk M. This means that the position of the orbit drawn in a substantially spiral shape is determined. A pit means a hole or a dent, for example. Moreover, the groove (groove) means an elongate dent-like thing, for example. Wobble means meandering of a track on which a data signal such as information is recorded. The servo means a mechanism that automatically corrects and controls by measuring the state of the control target and comparing it with a predetermined reference value.

  Further, the defocus adjustment in this specification means an adjustment operation for performing focusing on an object that is not focused, for example. Further, the detrack adjustment in this specification means an adjustment operation for performing the track alignment with respect to an object whose focal point is not aligned with the track of the optical disc, for example. The tilt in the optical disc device 1 or the optical pickup device 2 is, for example, the light of the laser light L emitted from the signal layer Ms of the optical disc M and the light emitting element 3 of the optical pickup device 2 and transmitted through the objective lens 4. This means an angular deviation from the axis La (FIGS. 1, 2, and 4A and 4B).

Further, the media means, for example, a disk on which data, information, signals, etc. are stored. An optical pickup device 2 built in the optical disc apparatus 1 (FIG. 1) is used to reproduce or record data such as information on the optical disc M. As the optical disk M, for example, “CD” series optical disks, “DVD” (registered trademark) series optical disks, “HD DVD” (registered trademark) series optical disks, and “Blu-ray Disc” (registered trademark) series Optical discs and the like. “CD” is an abbreviation for “Compact Disc” (trademark). “DVD” is an abbreviation for “Digital Versatile Disc” (registered trademark). “HD DVD” is an abbreviation for “High Definition DVD” (registered trademark).

  On the signal surface portion Ms of the optical disc M, a signal portion Mt for storing each data on the optical disc M is provided. The signal surface portion Ms of the optical disk is handled as a substantially planar signal layer surface, a substantially planar recording layer surface, or the like. The signal portion Mt of the optical disc M is formed as many fine pits Mt. When the disk-shaped optical disk M is viewed in plan, many fine pits Mt are arranged in a spiral shape. When the optical disc M is viewed from the signal surface portion Ms side of the optical disc M, the pit Mt row has a spiral shape. Since each pit Mt is very small, each pit Mt is not visible. In FIG. 1, FIG. 2, and FIG. 4, the signal layer Ms of the optical disk M and the pit Mt are shown using a broken line for convenience. In place of the pit Mt, for example, an optical disc M provided with a groove (not shown) capable of recording each signal can be used as the signal portion Mt of the optical disc M.

  Further, examples of the disc include an optical disc (not shown) in which signal surfaces are provided on both sides of the disc and data writing / erasing and data rewriting are possible. Further, examples of the disk include an optical disk (not shown) provided with a two-layer signal surface and capable of data writing / erasing and data rewriting. Also, for example, an “HD DVD” optical disc (not shown) provided with a three-layer signal surface and capable of data writing / erasing and data rewriting is also included. In addition, for example, a “Blu-ray Disc” optical disc (not shown) provided with a four-layer signal surface and capable of data writing / erasing and data rewriting is also included. In addition, for example, an optical disc (not shown) or the like on which a label or the like can be written by irradiating the label surface side of the disc with the laser light L is also included. The signal layer Ms of the optical disc M is formed of, for example, a metal layer such as a metal thin film. Information, data, and the like are recorded on the signal layer Ms formed of a metal thin film or the like.

  An optical disk M is mounted on a turntable (not shown) that is rotationally driven by a spindle motor (not shown).

  Further, the optical pickup device 2 is equipped with a light emitting element 3 so-called a laser diode 3 that irradiates the optical disk M with a light beam L that is a laser beam L. For example, the laser diode 3 is, for example, a two-wavelength light emitting element 3 capable of emitting laser light L having two types of wavelengths, that is, a first laser beam and a second laser beam having a different wavelength from the first laser beam. Composed. As described above, the laser diode 3 is, for example, the light emitting element 3 capable of emitting laser light L having a plurality of types of wavelengths. Depending on the design / specifications of the optical disk device 1 and the optical pickup device 2, for example, a single wavelength light emitting element 3 capable of emitting laser light L of one type of wavelength may be used as the laser diode 3. From the laser diode 3, for example, an infrared laser beam L for CD having a wavelength of about 765 to 830 nm (nanometer) and a reference wavelength of about 780 nm is emitted. Alternatively, a red laser beam L for DVD having a wavelength of about 630 to 685 nm and a reference wavelength of about 635 nm or about 650 nm is emitted from the laser diode 3. Alternatively, a blue-violet laser beam L for “HD DVD” and / or “Blu-ray Disc” having a wavelength of about 350 to 450 nm and a reference wavelength of about 405 nm is emitted from the laser diode 3.

A laser beam L having an output value of 0.2 to 500 mW (milliwatts), specifically 2 to 400 mW, is emitted from the laser diode 3. For example, when the laser beam L has an output value of less than 0.2 mW, the laser beam L is reflected after reaching the optical detector 5 after being irradiated on the optical disk M.
The amount of light is insufficient. When reproducing each data of the optical disc M, the laser beam L having an output value of several to several tens of mW, for example, about 2 to 20 mW is sufficient. When writing each data or the like on the optical disc M, the laser beam L having an output value of several tens to several hundreds mW is required. For example, when writing each data or the like on the optical disc M at a high speed, a pulse laser beam L having a high output value such as 400 mW or 500 mW may be required.

  For example, an infrared laser beam for CD is defined as a first wavelength laser beam. For example, a red laser beam for DVD is defined as a second wavelength laser beam. Further, for example, a blue-violet laser beam for “HD DVD” and / or “Blu-ray Disc” is defined as the third wavelength laser beam. In this specification, the definitions relating to each wavelength laser beam such as the first wavelength laser beam, the second wavelength laser beam, and the third wavelength laser beam are definitions for convenience for explaining the optical disk device 1 and the optical pickup device 2. It is said.

  In addition, a diffraction grating (not shown) having a substantially rectangular shape in plan view that branches one laser beam L emitted from the laser diode 3 into at least three light beams (not shown) is provided in the optical pickup device 2. Equipped. A laser beam diffracted and branched by a diffraction grating (not shown) includes, for example, a main beam (zero-order light) and a pair of sub beams (± first-order diffracted light beams) branched approximately symmetrically around the main beam with the main beam as a central axis. ) And at least three beams. A diffraction grating (not shown) is located immediately after the laser light emission side of the laser diode 3, for example. For example, the optical pickup device 2 is equipped with a four-divided diffraction grating (none of which is shown) having periodic structure portions with four different phases and four substantially rectangular diffraction region portions. Depending on the design / specifications of the optical disk device 1 and the optical pickup device 2, for example, a three-part type diffraction grating in which three different phase periodic structure portions are formed and three substantially rectangular diffraction region portions are used may be used. Good (none shown). In addition, for example, a two-divided diffraction grating having two different phase periodic structure portions and two substantially rectangular diffraction region portions may be used (not shown). As described above, the optical pickup device 2 is equipped with a plurality of division type diffraction gratings so-called in-line gratings having a plurality of substantially rectangular diffraction region portions. Further, depending on the design / specifications of the optical disc device 1 and the optical pickup device 2, for example, a diffraction grating (not shown) having one periodic structure portion and one substantially rectangular diffraction region portion is optically used. The type pickup device 2 may be equipped.

  The optical pickup device 2 is equipped with an objective lens 4 that narrows down the light beam L emitted from the laser diode 3 and irradiates the signal surface portion Ms of the optical disk M. When the laser beam L is narrowed down by the objective lens 4, a focused spot Ls is irradiated and formed on the signal surface portion Ms of the optical disc M. Here, for the sake of convenience, the optical pickup device 2 having one objective lens 4 is provided in the optical disc device 1, but depending on the design / specifications of the optical disc device 1 and the optical pickup device 2, for example, two or more objectives are used. An optical pickup device 2 having a lens 4 may be provided in the optical disc device 1. As described above, the optical pickup device 2 having the plurality of objective lenses 4 may be provided in the optical disc device 1.

Further, the optical pickup device 2 is equipped with a photodetector 5 that receives the light beam L reflected from the signal surface portion Ms of the optical disk M. The photodetector 5 is diffracted by transmitting a substantially rectangular main light receiving portion (not shown) corresponding to a main beam (zero-order light) that has passed through a diffraction grating (not shown) and a diffraction grating (not shown). It is configured to include at least three light-receiving portions corresponding to a pair of branched sub-beams (± first-order diffracted light beams) and a pair of sub-light-receiving portions (not shown) that are substantially rectangular in plan view. A main light-receiving part (not shown) having a substantially rectangular shape in plan view is divided into four substantially equal parts and includes four segments having a substantially rectangular shape in plan view. The sub-light-receiving unit (not shown) having a substantially rectangular shape in plan view includes four segments that are substantially equally divided into four and are substantially rectangular in plan view. Depending on the design / specifications of the optical disc device 1 and the optical pickup device 2, for example, a light receiving unit (not shown) having a substantially rectangular shape in plan view that includes two segments that are substantially equally divided into two and having a rectangular shape in plan view. The detector 5 may be configured. As described above, the optical pickup device 2 is equipped with the photodetector 5 having each of the plurality of divided type light receiving portions provided with a plurality of substantially rectangular segments in plan view. The photodetector 5 receives the laser light L reflected from the signal surface portion Ms of the optical disc M, converts the signal into an electric signal, and detects information recorded on the signal surface portion Ms of the optical disc M. ing. The light detector 5 receives the laser light L reflected from the signal surface portion Ms of the optical disk M, converts the signal into an electric signal, and forms a lens holder with an objective lens 4 (not shown) constituting the optical pickup device 2. ) Servo mechanism (not shown) is operated. When data / information / signal recorded on the optical disc M is read out or data / information / signal is written on the optical disc M by the optical pickup device 2, By irradiating the laser beam L, a main information signal of the optical disc M, a focusing error signal and a tracking error signal for the optical disc M are detected.

  Further, the optical pickup device 2 includes a focusing coil 71 that displaces the objective lens 4 substantially along a direction Df perpendicular to the surface Mf of the optical disk M, and the objective lens 4 substantially along the radial direction Dt of the optical disk M. The objective lens 4 is tilted in response to the tilting fluctuation of the optical disk M generated when the tracking coil 72 to be displaced and the optical disk M (FIG. 2) are rotating, or the optical disk M (FIGS. 4A and 4B). ) Is rotated, and the tilt coil 73 (FIG. 1) is provided to tilt the objective lens 4 in response to the roll of the optical disk M substantially along the radial direction Dt of the optical disk M. ing. For example, the optical pickup device 2 is equipped with one or a plurality of pairs or a plurality of pairs or two or more pairs of focusing coils 71. The focusing coil 71 is, for example, the first coil 71. Further, for example, one or a plurality, or a pair or a plurality of pairs of tracking coils 72 are provided in the optical pickup device 2. The tracking coil 72 is, for example, the second coil 72. Further, for example, one or a plurality, or a pair or a plurality of pairs of tilt coils 73 are mounted on the optical pickup device 2. The tilt coil 73 is, for example, a third coil 73. Further, the definitions relating to the directions Df and Dt such as the focusing direction Df or the tracking direction Dt in this specification are defined for the convenience of describing the optical disc device 1 and the optical pickup device 2.

  Further, the optical pickup device 2 includes a so-called actuator that can drive a lens holder (not shown) on which the objective lens 4 is mounted. “Actuator” means a drive device that converts energy into, for example, translational motion or rotational motion. The actuator constituting the optical pickup device 2 includes coils 71, 72, 73, lens holders (not shown) to which the coils 71, 72, 73 and the objective lens 4 are attached, and coils 71, 72, 73. Corresponding magnetic members (not shown) such as magnets close to each other, a frame yoke (not shown) having each yoke (not shown) mounted with each magnet (not shown), and a lens (not shown) A suspension wire (not shown) that elastically supports the holder and a circuit board (not shown) to which a suspension wire (not shown) is connected so as to be energized are attached.

  “Yoke” means, for example, one that structurally supports magnetic coupling. The “yoke” is supposed to reduce leakage of magnetic force generated from a magnetic member such as a magnet or magnetic steel. The “frame” means, for example, a frame, a framework, or a framework. The frame yoke is formed as a frame having a function as a yoke. The circuit board is called, for example, a PWB (printed wired board / printed wiring board). By configuring the actuator, a magnetic field generated in each magnet is efficiently used. For example, an actuator is provided that improves the driving force of each coil 71, 72, 73 with respect to each magnet.

  When electricity is passed through the first coil 71 (FIG. 1) close to the magnet, the lens holder having at least the objective lens 4 and the first coil 71 is efficiently driven substantially along the focusing direction Df (FIG. 2). . Further, when electricity is passed through the second coil 72 (FIG. 1) close to the magnet, the lens holder having at least the objective lens 4 and the second coil 72 is efficiently substantially along the tracking direction Dt (FIG. 4). To drive. Further, when electricity is passed through the third coil 73 (FIG. 1) close to the magnet, the lens holder having at least the objective lens 4 and the third coil 73 is efficiently tilted (FIGS. 2 and 4).

  When data / information / signal reading / writing of the optical disc M (FIG. 1) is performed, the optical pickup device 2 of the optical disc apparatus 1 moves substantially along the inside / outside direction Db of the rotating optical disc M. Further, when the focusing adjustment of the objective lens 4 of the optical pickup device 2 is performed with respect to the rotating optical disc M, the objective lens 4 is usually finely moved along the vertical direction Da of the disc, so that the position of the objective lens 4 is increased. Adjustments are made. The disc vertical direction Da means, for example, a direction perpendicular to the disc surface Mf formed from the inner peripheral portion Mc to the outer peripheral portion Md of the optical disc M when the optical disc M is maintained in a substantially horizontal state. The disc surface Mf of the optical disc M is formed substantially parallel to the signal surface portion Ms of the optical disc M.

The state will be described in detail when the focusing adjustment of the objective lens 4 is performed with respect to the optical disk M, the optical disc M upwards Da ₂ or the objective lens 4 substantially along the lower direction Da ₁ (FIG. 2) is slightly moved The laser light spot Ls that has passed through the objective lens 4 is focused on the signal portion Mt of the optical disk M.

  Further, when the tracking adjustment of the objective lens 4 of the optical pickup device 2 is performed on the rotating optical disc M (FIG. 1), the objective lens 4 is usually finely moved along the disc inside / outside direction Db. The position of the lens 4 is adjusted. The disc inner / outer direction Db means, for example, a direction along the disc surface Mf between the inner peripheral portion Mc and the outer peripheral portion Md of the optical disc M when the optical disc M is maintained in a substantially horizontal state.

The state when tracking adjustment of the objective lens 4 with respect to the optical disc M will be described in detail. The objective lens 4 is moved slightly along the outer direction Db ₂ or the inner direction Db ₁ of the optical disc M (FIG. 4). The laser light spot Ls transmitted through the objective lens 4 is aligned with the signal portion Mt of the optical disk M.

  In this specification, the definitions relating to each direction such as “upper”, “lower”, “inner”, “outer”, and the like are definitions for convenience in describing the optical disc apparatus 1, the optical pickup apparatus 2, and the optical disc M.

  The optical pickup is generally abbreviated as “OPU”. In addition, “optical pickup unit” is sometimes abbreviated as “OPU”. Here, for convenience, the optical pickup device is abbreviated as OPU. A laser diode is abbreviated as LD. The grating is abbreviated as “GRT”. The objective lens is abbreviated as “OBL”. The photo detector / photo diode IC is abbreviated as “PD” or “PDIC”.

The OPU 2 includes the LD 3, the GRT, the OBL 4, the lens holder, the PDIC 5, the focusing coil 71, the tracking coil 72, the tilt coil 73, the magnetic member, the frame, A yoke, the suspension wire, and the circuit board are provided. The OPU 2 is moved substantially along the radial direction Dt of the optical disc M by a feed motor (not shown) that can drive the pickup apparatus main body. Depending on the design / specifications of the OPU 2, etc., the OPU 2 constituting the optical disc apparatus 1 further includes the feeding motor.

  The optical disc apparatus 1 includes an optical output signal processing circuit 6 that receives a signal detected by the PDIC 5 installed in the OPU 2 and outputs the signal detected by the PDIC 5 as a high frequency signal, for example, as an RF signal. The RF signal means, for example, a signal converted to a high frequency that is substantially the same as a radio wave. “RF” is an abbreviation for “radio frequency”.

  A signal converted from an optical signal to an electric signal by the PDIC 5 installed in the OPU 2 is input to an optical output signal processing circuit 6 so-called front end processing unit 6. The front-end processing unit 6 is configured to generate and output a high-frequency signal such as an RF signal that is a reproduction signal of the signal recorded on the optical disc M, a focusing error signal, and a tracking error signal. Yes.

  A focusing error is a light L focused by OBL 4 along a direction Df substantially perpendicular to the signal layer Ms such as the optical axis direction Df with respect to a pit Mt or groove (not shown) of the optical disc M. This means that the focal point Ls of the lens is displaced. A tracking error is a positional deviation of the focus Ls of the light L focused by the OBL 4 in the direction Dt substantially along the signal layer Ms such as the radial direction Dt with respect to the pit Mt or groove of the optical disc M. It means to cause.

  The optical disc apparatus 1 amplifies the signal detected by the photodetector 5 and converted to a high frequency signal by the optical output signal processing circuit 6, and also converts the high frequency analog signal into a digital signal. A circuit 7 is provided. More specifically, the optical disc apparatus 1 amplifies a signal detected by the PDIC 5 and converted into an RF signal by the front-end processing unit 6, and also converts an RF signal, which is an analog signal, into a digital signal. A processing circuit 7 is provided. Analog means expressing a state of a substance or a system by a physical quantity that continuously changes. Digital means expressing a state of a substance or a system by signals such as discrete numbers and characters.

  A high-frequency signal such as an RF signal that is a reproduction signal generated by the front-end processing unit 6 is input to a signal processing circuit 7 such as an RF signal amplification / processing circuit 7. A signal processing circuit 7 such as the RF signal amplification / processing circuit 7 amplifies a high frequency signal such as an RF signal. The signal processing circuit 7 such as the RF signal amplification / processing circuit 7 is configured to output an input analog signal as a binarized signal, so-called digital signal. Based on the signal output from the signal processing circuit 7 such as the RF signal amplification / processing circuit 7, the jitter value is satisfactorily detected.

  The optical disc apparatus 1 further includes a digital signal processing circuit 8 that demodulates the digital signal output from the signal processing circuit 7 such as the RF signal amplification / processing circuit 7. The digital signal output from the signal processing circuit 7 such as the RF signal amplification / processing circuit 7 is input to the digital signal processing circuit 8. The digital signal processing circuit 8 is configured to demodulate various signals.

The optical disc apparatus 1 further includes a jitter value detection circuit 9 that detects a jitter value that is a signal fluctuation value based on a signal read from the optical disc M by the PDIC 5 of the OPU 2 having the OBL 4. More specifically, the optical disc apparatus 1 has a jitter value which is a signal fluctuation value based on a signal obtained from a digital signal processing circuit 8 through a signal processing circuit 7 such as an RF signal amplification / processing circuit 7. A jitter value detecting circuit 9 for detecting the so-called jitter measuring circuit 9.

  The signal generated by the digital signal processing circuit 8 is input to the jitter measurement circuit 9. For example, when the optical disc M is a CD standard optical disc, the jitter measurement circuit 9 detects a signal having a length of 3T to 11T, and based on the reference clock signal, the time variation of the frequency of the reproduction signal, that is, the jitter value. Is detected. The smaller the jitter value detected by the jitter measuring circuit 9, the smaller the time variation and the better the reproduction characteristics.

  When a synchronous signal is detected from a high-frequency signal such as an RF signal, the time variation of the frequency F is detected by the reference clock. The smaller the time variation, the smaller the time variation and the better the performance. The reference clock is abbreviated as a reference CLK, for example. The signal length of the synchronous system will be described. For example, 3T to 11T for the CD series, 3T to 11T for the DVD series, mainly 3T to 14T, 2T for the "HD DVD" series, for example. In the case of ˜11T and “Blu-ray Disc” series, it is 2T to 8T.

  The optical disc apparatus 1 also includes a system control circuit 10 that receives the signal output from the jitter measurement circuit 9 and controls the entire optical disc apparatus 1. Various controls / operations of the optical disc device 1 and the OPU 2 are performed by the system control circuit 10. The system control circuit 10 is configured by a microcomputer. A micro computer means a micro computer.

  The system control microcomputer is a CPU, a system controller, a microprocessor, a microcomputer, or the like, and is a control unit that controls system control of the optical disc apparatus 1 in general. “CPU” is an abbreviation for “Central Processing Unit” and means a central processing unit. Each function of the CPU 10 is realized by software so-called programs.

  The optical disc apparatus 1 further includes a first memory circuit 11 in which a program for causing the CPU 10 to perform various controls is stored. Each function implemented by software is stored in the first memory circuit 11 accessible by the CPU 10. The system control circuit 10 is configured to perform various controls / operations based on a program stored in the first memory circuit 11 such as a flash ROM. “ROM” is an abbreviation for “read-only memory”. As the first memory circuit 11, for example, a flash memory is used.

  The first memory circuit 11 will be described in detail. Examples of the first memory circuit 11 include a ROM such as an EEPROM. ROM means read-only memory. The EEPROM means a ROM whose contents can be electrically rewritten. The EEPROM is a so-called nonvolatile memory. When the EEPROM is changed, a voltage higher than a normal voltage is used. The EEPROM is capable of electrically erasing stored information. “EEPROM” is an abbreviation for “Electronically Erasable and Programmable Read Only Memory”.

  The first memory circuit 11 may be a ROM such as an EPROM. An EPROM means a ROM that can be erased and written any number of times. EPROM is performed by a special method different from that at the time of reading when the memory is erased. “EPROM” is an abbreviation for “Erasable Programmable Read Only Memory”.

  The optical disc apparatus 1 also includes a second memory circuit 12 that can store and erase various values input to the CPU 10. For example, a RAM is used as the second memory circuit 12. The RAM means a storage device that can access data in substantially the same time regardless of the storage location or order. “RAM” is an abbreviation for “random access memory”. The system control circuit 10 controls the operation of the second memory circuit 12 such as a RAM. The second memory circuit 12 is configured to store a defocus value and a jitter value corresponding to the defocus value. The second memory circuit 12 is configured to be capable of storing a detrack value and a jitter value corresponding to the detrack value. The second memory circuit 12 is configured to be able to store a tilt value and a jitter value corresponding to the tilt value. The second memory circuit 12 includes a defocus value and a jitter value corresponding to the defocus value, a detrack value and a jitter value corresponding to the detrack value, a tilt value and a jitter value corresponding to the tilt value. Among the values selected from the group, at least one value can be stored.

  The second memory circuit 12 includes a defocus value and a jitter value corresponding to the defocus value, a detrack value and a jitter value corresponding to the detrack value, a tilt value and a jitter value corresponding to the tilt value. Although it is configured to be able to store three types of values (total of six types), depending on the design / specifications of the optical disc apparatus 1, for example, a defocus value, a jitter value corresponding to the defocus value, and a detrack A second memory circuit 12 that can store two types of values (a total of four types) including a value and a jitter value corresponding to the detrack value may be configured. Further, depending on the design / specifications of the optical disc apparatus 1, for example, there are two types (a total of four types) of a detrack value and a jitter value corresponding to the detrack value and a tilt value and a jitter value corresponding to the tilt value. A second memory circuit 12 capable of storing values may be configured. Further, depending on the design / specifications of the optical disc apparatus 1, for example, there are two types (a total of four types) of a tilt value and a jitter value corresponding to the tilt value and a defocus value and a jitter value corresponding to the defocus value. A second memory circuit 12 capable of storing values may be configured.

  Depending on the design / specifications of the optical disc apparatus 1, for example, the defocus value, the jitter value corresponding to the defocus value, the detrack value, the jitter value corresponding to the detrack value, the tilt value, and the tilt value are supported. A second memory circuit 12 capable of storing a plurality of required values among values selected from the group consisting of the jitter values may be configured.

  In addition, the optical disc apparatus 1 adjusts the OBL 4 to the signal plane portion Ms of the optical disc M based on the signal passing through the jitter measurement circuit 9 and the CPU 10 when the OBL 4 is focused on the OBL 4 in the optical axis direction Df of the OBL 4. A defocus value setting circuit 21 that adjusts the defocus value used for movement along the defocus value and causes the focusing servo circuit 31 to perform defocus adjustment based on the set and adjusted defocus value.

In addition, the optical disc apparatus 1 includes a focusing servo circuit 31 that enables a focusing servo operation of a lens holder (not shown) including the OBL 4 to be executed based on a focusing error signal generated by the front end processing unit 6. . More specifically, in the optical disc apparatus 1, the focusing error signal generated by the front end processing unit 6 based on the signal detected by the PDIC 5 is input and the direction is orthogonal to the surface Mf of the optical disc M. And a focusing servo circuit 31 that generates a control signal for displacing the OBL 4 mounted on the OPU 2 substantially along the optical axis direction Df of the OBL 4. The focusing error signal output from the front end processing unit 6 after being generated by the front end processing unit 6 is input to the focusing servo circuit 31. The focusing servo circuit 31 is configured using an equalizer. The focusing servo circuit 31 is configured as a digital equalizer that can handle digital signals. An equalizer is an electric circuit for processing and adjusting the overall frequency characteristics of a signal such as an audio signal. The equalizer is abbreviated as “EQ”.

  The defocus value for the focusing servo circuit 31 is set by the defocus value setting circuit 21. The defocus value setting circuit 21 is configured to be controlled by the system control circuit 10. When an operation for setting a defocus value suitable for the optical disk (M) is performed in the optical disk apparatus 1 after the optical disk (M) is installed in the optical disk apparatus 1, for example, the reference value is used. For the defocus value 0, the defocus value set for the focusing servo circuit 31 is, for example, in 2% increments from -10% to + 10%, and specifically in 2% increments from -8% to + 8%. Change it step by step.

  After the optical disk (M) is installed in the optical disk apparatus 1 according to the design / specifications of the optical disk apparatus 1, an operation for setting a defocus value suitable for the optical disk (M) is performed in the optical disk apparatus 1. In this case, for example, the defocus value set for the focusing servo circuit 31 with respect to the defocus value 0, which is a reference value, for example, in increments of 1% from -10% to + 10%, specifically -8. It may be changed in steps of 1% from% to + 8%.

  In addition, the optical disc apparatus 1 allows the OBL 4 to be focused in the radial direction Dt of the optical disc M when the OBL 4 of the OPU 2 is focused on the signal surface portion Ms of the optical disc M based on the signal passing through the jitter measurement circuit 9 and the CPU 10. And a detrack value setting circuit 22 that causes the tracking servo circuit 32 to perform detrack adjustment based on the detrack value that has been set and adjusted.

  The optical disc apparatus 1 also includes a tracking servo circuit 32 that enables a tracking servo operation of a lens holder (not shown) including the OBL 4 to be executed based on the tracking error signal generated by the front end processing unit 6. . More specifically, the optical disc apparatus 1 receives the tracking error signal generated by the front-end processing unit 6 based on the signal detected by the PDIC 5 and supplies it to the OPU 2 substantially along the radial direction Dt of the optical disc M. A tracking servo circuit 32 that generates a control signal for displacing the equipped OBL 4 is provided. After being generated by the front end processing unit 6, the tracking error signal output from the front end processing unit 6 is input to the tracking servo circuit 32. The tracking servo circuit 32 is configured using an equalizer. The tracking servo circuit 32 is configured as a digital equalizer that can handle digital signals.

  The detrack value for the tracking servo circuit 32 is set by the detrack value setting circuit 22. The detrack value setting circuit 22 is configured to be controlled by the system control circuit 10. When an operation for setting a detrack value suitable for the optical disk (M) is performed in the optical disk apparatus 1 after the optical disk (M) is installed in the optical disk apparatus 1, for example, the reference value is used. With respect to the detrack value 0, the detrack value set for the tracking servo circuit 32 is, for example, in 2% increments from -10% to + 10%, specifically, in 2% increments from -8% to + 8%. Change it step by step.

After the optical disk (M) is installed in the optical disk apparatus 1 according to the design / specifications of the optical disk apparatus 1, an operation for setting a detrack value suitable for the optical disk (M) is performed in the optical disk apparatus 1. In this case, for example, the detrack value set for the tracking servo circuit 32 with respect to the detrack value 0 as the reference value is set in increments of 1% from -10% to + 10%, specifically, -8. It may be changed in steps of 1% from% to + 8%.

  In addition, the optical disc apparatus 1 performs OBL4 focusing on the signal plane portion Ms of the optical disc M when the OBL4 of the OPU 2 is focused on the signal plane portion Ms of the optical disc M based on the signal passing through the jitter measuring circuit 9 and the CPU 10. And a tilt value setting circuit 23 for adjusting the tilt value used for correcting the angle deviation and adjusting the tilt based on the adjusted tilt value.

  An appropriate tilt value is set by the tilt value setting circuit 23. The tilt value setting circuit 23 is configured to be controlled by the system control circuit 10. When an operation for setting a tilt value suitable for the optical disk (M) is performed in the optical disk apparatus 1 after the optical disk (M) is installed in the optical disk apparatus 1, for example, a tilt that is used as a reference value For the value 0, the set tilt value is changed in steps of 2% from -10% to + 10%, for example, in steps of 2% from -8% to + 8%.

  When the optical disk device 1 is equipped with an optical disk (M) in accordance with the design / specifications of the optical disk device 1 and the optical disk device 1 performs an operation for setting a tilt value suitable for the optical disk (M). For example, with respect to a tilt value of 0, which is a reference value, the set tilt value is, for example, in steps of 1% from -10% to + 10%, specifically in steps of 1% from -8% to + 8%. You may change it by using

  Further, the optical disc apparatus 1 receives, for example, a focusing control signal FDO output from a focusing servo circuit 31, and extracts a signal corresponding to the rotation period Cf (FIG. 3) of the optical disc M based on the focusing control signal FDO. A focusing tilt bandpass filter circuit 41 (FIG. 1) is provided. FDO in this specification is an abbreviation for “focus drive out”. The band pass filter is abbreviated as “BPF”. BPF means a filter that passes only a predetermined range of frequency signals and attenuates signals other than the predetermined range of frequency signals. If surface shake occurs in the optical disc M (FIG. 2) during disk reproduction or disk recording, the surface shake component becomes an FDO signal (FIG. 3). A focusing servo operation is executed by supplying an FDO signal.

  In addition, the optical disc apparatus 1 (FIG. 1) receives, for example, a tracking control signal TDO output from the tracking servo circuit 32, and corresponds to the rotation cycle Ct (FIG. 5) of the optical disc M based on the tracking control signal TDO. A tracking tilt bandpass filter circuit 42 (FIG. 1) for extracting a signal is provided. TDO in this specification is an abbreviation for “tracking drive out”. If an eccentricity occurs in the optical disk M (FIG. 4) during disk reproduction or recording, the eccentric component becomes a TDO signal (FIG. 5). The tracking servo operation is executed by passing the TDO signal.

  Depending on the design / specifications of the optical disk device 1 and the optical pickup device 2, for example, the optical disk device 1 can be used without the focusing tilt bandpass filter circuit 41, the tracking tilt bandpass filter circuit 42, etc. Is done.

In addition, the optical disc apparatus 1 is configured to detect the angular shift of the OBL 4 based on the jitter detected by the jitter measurement circuit 9 when an angular shift is generated in the OBL 4 of the OPU 2 with respect to the signal layer Ms of the optical disc M. A focusing tilt signal adjusting circuit 51 for adjusting the tilt of the lens. The focusing tilt signal adjustment circuit 51 can adjust the level of the signal extracted by the focusing tilt bandpass filter circuit 41. For example, an amplifier is used as the focusing tilt signal adjustment circuit 51. An amplifier is an abbreviation for amplifier and means an amplifier.

  Further, the optical disc apparatus 1 is configured such that when the angular deviation of the OBL 4 of the OPU 2 is about to occur with respect to the signal layer Ms of the optical disc M, the angular deviation of the OBL 4 is based on the jitter detected by the jitter measuring circuit 9. A tracking tilt signal adjustment circuit 52 is provided for adjusting the tilt. The tracking tilt signal adjustment circuit 52 can adjust the level of the signal extracted by the tracking tilt bandpass filter circuit 42. For example, an amplifier is used as the tracking tilt signal adjustment circuit 52.

  The optical disc apparatus 1 further includes an addition circuit 53 that adds the tilt value setting adjustment signal output from the tilt value adjustment circuit 23 to the tilt adjustment signals output from the tilt signal adjustment circuits 51 and 52. More specifically, the optical disc apparatus 1 includes a focusing tilt adjustment signal output from the focusing tilt signal adjustment circuit 51, a tracking tilt adjustment signal output from the tracking tilt signal adjustment circuit 52, and a tilt value adjustment circuit 23. An adding circuit 53 for adding the output tilt value setting adjustment signal is provided. A focusing tilt adjustment signal is output from the focusing tilt signal adjustment circuit 51. A tracking tilt adjustment signal is output from the tracking tilt signal adjustment circuit 52. Further, a tilt value setting adjustment signal set to an optimum tilt value is output from the tilt value adjustment circuit 23. These signals are combined by the adder circuit 53.

  The optical disc apparatus 1 further includes a focusing coil drive circuit 61 that receives the focusing control signal output from the focusing servo circuit 31 and supplies a driving signal to the focusing coil 71 provided in the OPU 2. The focusing servo circuit 31 outputs a focusing control signal for reducing the level of the focusing error signal to the focusing coil drive circuit 61 based on the input focusing error signal. The focusing control signal output from the focusing servo circuit 31 is input to the focusing coil drive circuit 61. The focusing coil drive circuit 61 supplies a focusing coil drive signal to the focusing coil 71. When the focal point of the laser beam L focused by the OBL4 is shifted along the focusing direction Df of the OBL4 with respect to the pit Mt of the optical disk M, a focusing coil drive is performed to adjust the OBL4 of the OPU2. A focusing drive signal is sent from the circuit 61 to the focusing coil 71 of the OPU 2. The drive circuit is called a driver or the like.

  The optical disc apparatus 1 further includes a tracking coil drive circuit 62 that receives the tracking control signal output from the tracking servo circuit 32 and supplies a drive signal to the tracking coil 72 provided in the OPU 2. The tracking servo circuit 32 outputs a tracking control signal for reducing the level of the tracking error signal to the tracking coil drive circuit 62 based on the input tracking error signal. The tracking control signal output from the tracking servo circuit 32 is input to the tracking coil drive circuit 62. The tracking coil drive circuit 62 supplies a tracking coil drive signal to the tracking coil 72. When the focal point of the laser beam L focused by the OBL 4 is shifted with respect to the pit Mt of the optical disc M along the tracking direction Df of the OBL 4, a tracking coil drive is used to adjust the tracking of the OBL 4 of the OPU 2. A tracking drive signal is sent from the circuit 62 to the tracking coil 72 of the OPU 2.

The optical disc apparatus 1 further includes a tilt coil drive circuit 63 to which the addition signal output from the addition circuit 53 is input. More specifically, the optical disc apparatus 1 includes a tilt coil drive circuit 63 that receives the tilt control signal output from the adder circuit 53 and supplies a drive signal to the tilt coil 73 provided in the OPU 2. In order to adjust the tilt of the OBL 4 of the OPU 2, a drive signal sent to the tilt coil 73 of the OPU 2 is generated by the tilt coil drive circuit 63 based on the addition signal generated by the adder circuit 53. The tilt coil drive circuit 63 supplies a tilt coil drive signal to the tilt coil 73. When the focus of the laser light L focused by the OBL 4 is shifted with respect to the pit Mt of the optical disc M, the tilt coil drive circuit 63 changes the tilt to the tilt coil 73 of the OPU 2 in order to adjust the tilt of the OBL 4 of the OPU 2. A tilt drive signal is sent.

  As shown in FIG. 1, the optical disc apparatus 1 includes setting circuits 21, 22, 23 selected from the group consisting of the defocus value setting circuit 21, the detrack value setting circuit 22, and the tilt value setting circuit 23. Of these, at least one setting circuit 21, 22, 23 is provided. Thus, the optical disc apparatus 1 is configured that can set at least one optimum value among the optimum defocus value, optimum detrack value, and optimum tilt value.

  More specifically, the optical disc apparatus 1 shown in FIG. 1 includes the OPU 2, the optical output signal processing circuit 6, the signal processing circuit 7, the digital signal processing circuit 8, the jitter value detection circuit 9, and the above. System control circuit 10, first memory circuit 11, second memory circuit 12, defocus value setting circuit 21, detrack value setting circuit 22, tilt value setting circuit 23, and focusing Servo circuit 31, tracking servo circuit 32, focusing tilt bandpass filter circuit 41, tracking tilt bandpass filter circuit 42, focusing tilt signal adjustment circuit 51, tracking tilt signal adjustment circuit 52, The adder circuit 53, the focusing coil drive circuit 61, A serial tracking coil driving circuit 62 is configured by a the tilt coil drive circuit 63. The lens adjustment circuit of the optical disc apparatus 1 is configured in this way.

  Depending on the design / specifications of the optical disc apparatus 1 and OPU 2, for example, the OPU 2 and the optical disc apparatus 1 in which the focusing coil 71 and / or the tracking coil 72 of the OPU 2 are also used as the tilt coil 73 of the OPU 2 can be used. Has been. More specifically, the conductor extended from the tilt coil drive circuit 63 of the optical disc apparatus 1 is provided in the focusing coil 71 and / or the tracking coil 72 of the OPU 2 without the OPU 2 being equipped with the tilt coil 73 dedicated for tilt adjustment. It is also possible to use the OPU 2 and the optical disc apparatus 1 that are connected to be energized and configured as a coil 71/72 in which the focusing coil 71 and / or the tracking coil 72 of the OPU 2 can also perform tilt adjustment. More specifically, the conductor extended from the tilt coil drive circuit 63 of the optical disc apparatus 1 is connected to the focusing coil 71 of the OPU 2 so as to be energized without the OPU 2 being equipped with the tilt coil 73 dedicated for tilt adjustment. Then, the focusing coil 71 of the OPU 2 may be configured to also serve as the tilt coil 73 of the OPU 2, and the focusing coil 71 may be configured as, for example, the focus / tilt coil 71 that functions at the time of focusing adjustment and / or tilt adjustment.

The optical disc apparatus 1 includes a digital signal processing apparatus including a digital signal processing circuit 8, for example, a so-called digital signal processor. The digital signal processor means, for example, a microprocessor mainly specialized in digital signal processing. The digital signal processor is abbreviated as “DSP”. A chip including a digital signal processing circuit 8 constituting the DSP is provided. By using the DSP including the digital signal processing circuit 8, for example, high-speed arithmetic processing in the CPU 10 or the like can be executed. By using the DSP, when signal processing is performed, for example, the SN (signal / noise) ratio is set to about 90 dB (decibel) or more, and the influence of noise is easily avoided, and the ambient temperature depends on the ambient temperature. The influence is also easily suppressed. For this reason, high-precision arithmetic processing and the like are performed at high speed by using the DSP.

  For example, the DSP of the optical disc apparatus 1 includes the digital signal processing circuit 8, the jitter value detection circuit 9, the system control circuit 10, the defocus value setting circuit 21, the detrack value setting circuit 22, and the above. A tilt value setting circuit 23, the focusing servo circuit 31, and the tracking servo circuit 32 are provided. Also, for example, the optical output signal processing circuit 6, the signal processing circuit 7, the digital signal processing circuit 8, the jitter value detection circuit 9, the system control circuit 10, and the first memory circuit 11 The second memory circuit 12, the defocus value setting circuit 21, the detrack value setting circuit 22, the tilt value setting circuit 23, the focusing servo circuit 31, the tracking servo circuit 32, and the The focusing tilt bandpass filter circuit 41 and the tracking tilt bandpass filter circuit 42 constitute a chip in which complicated circuits are combined into one package or the like.

  By configuring the optical disk apparatus 1 shown in FIG. 1, the optical disk apparatus 1 capable of setting an optimum defocus value is configured. An optimal defocus value is set in the optical disc apparatus 1 based on the jitter value detected based on the signal read from the optical disc M and the defocus value based on the detected jitter value.

  Further, by configuring the optical disc apparatus 1 shown in FIG. 1, the optical disc apparatus 1 capable of setting an optimum detrack value is configured. An optimal detrack value is set in the optical disk device 1 based on the jitter value detected based on the signal read from the optical disk M and the detrack value based on the detected jitter value.

  Further, by configuring the optical disc apparatus 1 shown in FIG. 1, the optical disc apparatus 1 capable of setting an optimum tilt value is configured. An optimal tilt value is set in the optical disc apparatus 1 based on the jitter value detected based on the signal read from the optical disc M and the tilt value based on the detected jitter value.

  Further, after the optical disk M is installed in the optical disk apparatus 1, when the signal is read from the optical disk M to detect the jitter value and the defocus adjustment of the OBL 4 with respect to the optical disk M is performed, the time within about 20 seconds. To adjust the defocus.

  As described above, since the time required for the defocus value adjustment method of the optical disc apparatus 1 is set to a short time, the defocus adjustment can be performed in the optical disc apparatus 1 without waiting for a long time for the defocus adjustment. Done. When the defocus adjustment of the OBL 4 with respect to the optical disc M is performed, the defocus adjustment is performed within a time of approximately 20 seconds or less. Therefore, after the optical disc M is installed in the optical disc apparatus 1, data / information of the optical disc M, etc. It is avoided that the optical disc apparatus 1 is excessively waited for a long time for the defocus adjustment that is automatically executed before the signal starts to be read.

  Further, after the optical disk M is installed in the optical disk apparatus 1, a signal is read from the optical disk M, the jitter value is detected, and the detrack adjustment of the OBL 4 with respect to the optical disk M is performed. To make detrack adjustments.

As described above, since the time required for the detrack value adjustment method of the optical disc apparatus 1 is set to a short time, the detrack adjustment can be performed in the optical disc apparatus 1 without waiting for a long time for the detrack adjustment. Done. When the detrack adjustment of the OBL 4 with respect to the optical disc M is performed, the detrack adjustment is performed within a time of approximately 20 seconds or less. It is avoided that the optical disk apparatus 1 is excessively waited for a long time for the detrack adjustment performed automatically before the signal starts to be read.

  Further, after the optical disk M is installed in the optical disk apparatus 1, a signal is read from the optical disk M to detect the jitter value, and the tilt adjustment of the OBL 4 with respect to the optical disk M is performed. Use to adjust the tilt.

  Since the time required for the tilt value adjusting method of the optical disc apparatus 1 is set in a short time as described above, tilt adjustment is performed in the optical disc apparatus 1 without waiting for a long time for the tilt adjustment. When the tilt adjustment of the OBL 4 with respect to the optical disc M is performed, the tilt adjustment is performed within a time period of approximately 20 seconds or less. Therefore, after the optical disc M is installed in the optical disc apparatus 1, a signal such as data / information of the optical disc M It is avoided that the optical disk apparatus 1 is excessively waited for a long time for the tilt adjustment that is automatically executed before being read.

  The optical disc apparatus 1 includes three setting circuits 21, 22, and 23 including the defocus value setting circuit 21, the detrack value setting circuit 22, and the tilt value setting circuit 23. For example, the optical disc apparatus 1 including the defocus value setting circuit 21 and the detrack value setting circuit 22 may be configured depending on the design / specification. Further, depending on the design / specification of the optical disc apparatus 1, for example, the optical disc apparatus 1 including the detrack value setting circuit 22 and the tilt value setting circuit 23 may be configured. Further, the optical disc apparatus 1 including the tilt value setting circuit 23 and the defocus value setting circuit 21 may be configured depending on the design / specifications of the optical disc apparatus 1 and the like.

  Depending on the design / specifications of the optical disc apparatus 1, for example, setting circuits 21, 22 selected from the group consisting of the defocus value setting circuit 21, the detrack value setting circuit 22, and the tilt value setting circuit 23. 23, the optical disc apparatus 1 including a plurality of required setting circuits 21 and / or 22 and / or 23 may be configured.

  When the adjustment method of the optical disk apparatus 1 is performed, the optical disk apparatus 1 including the OPU 2 having the OBL 4 is used to detect the jitter value of the signal read from the optical disk M and to detect the jitter value. Based on this, the position adjustment of the OBL 4 with respect to the optical disc M is performed.

  Next, a defocus value adjustment method of the disk device 1 will be described.

  FIG. 6A is a flowchart showing an embodiment of a defocus value adjusting method for the disk device, FIG. 6B is a flowchart showing each jitter value detecting step of the defocus value adjusting method for the disk device, and FIG. FIG. 8 is a graph showing a relationship between the defocus value and the jitter value, and FIG. 9 is a graph showing the relationship between the defocus value and the jitter value. 10 is a graph showing the relationship between the defocus value and the jitter value, FIG. 11 is a graph showing the relationship between the defocus value and the jitter value, and FIG. 12 is a graph showing the relationship between the defocus value and the jitter value. It is a graph which shows the relationship.

  In conjunction with the flowcharts shown in FIGS. 6A, 6B, and 7, the defocus value adjustment method of the optical disc apparatus 1 will be described with reference to the drawings.

  The defocus adjustment method of the optical disc apparatus 1 based on the jitter value is performed as follows. For example, the focus offset adjustment is performed at the time of reading the initial data of the OPU 2 in the vicinity of the inner periphery Mc of the disk immediately before the data reproduction of the reproduction / recording optical disk M (FIG. 1) or immediately after the initial data reading. At this time, for example, a defocus value adjustment process corresponding to the reference voltage value (Vref) is performed. For example, a signal having a substantially laid-down S-curve with a defocus value of −50% to + 50% centered on a reference value 0, which is a reference voltage value (Vref), is read in the optical disc apparatus 1.

  The optical disk device 1 is used to adjust the focusing of the OBL 4 with respect to the signal surface portion Ms of the optical disk M. A defocus value adjustment method in the optical disc apparatus 1 is performed using the optical disc apparatus 1.

For example, when the optical disk device 1 is powered on, preparation for executing the defocus value adjustment method of the optical disk device 1 is started. When the optical disk device 1 is turned on and the optical disk device 1 is turned on, data such as various information is sent from the memory circuit 11 such as the ROM 11 to the system control circuit 10. In this case, for example, a predetermined jitter value jitter _(i a f), various data such as the determination value jitter _(i a s) is set is sent to the system control circuit 10 to the system control circuit 10 (FIG. 6A: S110).

  This defocus value adjustment method of the optical disc apparatus 1 (FIG. 1) uses the optical disc apparatus 1 provided with the OPU 2 having the OBL 4 to detect the jitter value of the signal read from the optical disc M and to detect the detected jitter. When the OBL 4 of the OPU 2 is focused on the signal surface portion Ms of the optical disk M based on the value, the defocus value used to move the OBL 4 along the optical axis direction Df of the OBL 4 is adjusted to This is a defocus value adjustment method of the optical disc apparatus 1 for performing the OBL4 focusing adjustment. The following defocus value setting process is performed.

When the optical disc apparatus 1 is equipped with the optical disc M, an operation for causing the optical disc apparatus 1 to set an appropriate defocus value is substantially started. First, using the optical disc apparatus 1, a focus bias, so-called defocus, is applied to a focusing coil 71 to measure jitter. When the optical disc apparatus 1 is to perform the defocus value adjustment method, first, jitter is detected / measured with the defocus value ± 0 (FIG. 6A: S120). At this time, as shown in FIG. 11 or FIG. 12, for example, the jitter value jitter (i _a o) at the defocus value ± 0 is set to a small value equal to or smaller than the specified value jitter (i _a f), and the optical disc has good jitter characteristics. When it is determined by the program in the CPU 10 that it is M (FIG. 1) (FIG. 6A, S130: NO), the defocus value is set to 0 (FIG. 6A: S180), and the defocus adjustment is completed.

  This optical disc apparatus 1 (FIG. 1) has different data depending on the optical disc M having good jitter characteristics and the optical disc (M) that is estimated / determined that the jitter characteristics are not good and each jitter value needs to be detected / inspected. Adjust the focus value. In this specification, an optical disc M having good jitter characteristics and an optical disc (M) that is estimated / determined that jitter characteristics are not good and each jitter value needs to be detected / inspected are, for example, parentheses ( ) Are shown separately.

When performing the defocus value adjustment method in the optical disc apparatus 1 using the optical disc apparatus 1, the jitter values are detected / measured as necessary, for example, as shown in FIGS. More specifically, the jitter value jitter (i _a o) at the defocus value ± 0 is set to _a value larger than the specified value jitter (i _a f), and the jitter characteristics are not good in the program in the CPU 10 (FIG. 1). The following measurement is performed on the optical disc (M) that is estimated / determined and determined to require detection / inspection of each jitter value. First, when a signal is read from the optical disk (M) to detect a jitter value, the defocus value within a predetermined range is changed. More specifically, when the jitter value is detected by reading a signal from the optical disc (M), the defocus value reference value 0 including the defocus value reference value 0 (FIGS. 8, 9, and 10) is set. The defocus value is changed in steps within a numerical value within a predetermined range centered (FIG. 6A: S140, FIG. 6B: S141 to S146). Each time the defocus value is changed in stages, the jitter value is detected.

  The operation for setting the defocus value is performed by the defocus value setting circuit 21 in the state of performing the reproduction operation of the signal recorded on the optical disc (M) (FIG. 1). In the defocus value setting circuit 21, the value of the defocus value set for the focusing servo circuit 31 is increased by 2% from -8% to + 8% with respect to the reference value 0 (FIGS. 8, 9, and 10). Make changes. At the same time, the jitter measurement circuit 9 detects the jitter value of the reproduction signal corresponding to each defocus value, thereby setting the defocus value.

  More specifically, the defocus value setting circuit 21 sets the defocus value for the focusing servo circuit 31 to a value that is about -8% lower than the reference value 0, and the signal recorded on the optical disc (M). A reproduction operation is performed, and the jitter value included in the reproduction signal is detected by the jitter measurement circuit 9. The jitter value thus detected is stored in the memory circuit 12 such as the RAM 12 together with the defocus value.

  The defocus value is changed in steps of 2% from −8% to + 8% with respect to the reference value 0, and the jitter value corresponding to each defocus value is detected. The operation of memorizing is performed repeatedly.

  For an optical disc (M) in which an operation for setting a defocus value is started in the optical disc apparatus 1 and it is determined that each jitter value needs to be detected / inspected during the process of the defocus adjustment method of the optical disc apparatus 1. First, every time the defocus value is changed within a predetermined range, an operation of detecting a jitter value is performed (FIG. 6A: S140, FIG. 6B: S141 to S146). The predetermined range is, for example, a defocus value between −10% and + 10% set for the focusing servo circuit 31 with respect to the reference value when the defocus value 0 is determined as the reference value. (FIGS. 8, 9, and 10). For example, when the defocus value 0 is set as a reference value, the predetermined range of the defocus value is a range between −8% and + 8% set for the focusing servo circuit 31 with respect to the reference value. Is done.

  For example, if the defocus value is set smaller than −10%, the normal focusing servo function may not work. For example, when the defocus value is set to be larger than + 10%, the normal focusing servo function may not work. For this reason, a defocus value between −10% and + 10% around the defocus value reference value 0 is preferably set for the focusing servo circuit 31. Preferably, a defocus value between −8% and + 8% around the reference value 0 of the defocus value is set for the focusing servo circuit 31, so that a normal focusing servo function works.

For example, it is estimated that the jitter value jitter (i _a o) at the defocus value reference value 0 (FIGS. 8, 9, and 10) is larger than the specified value jitter (i _a f), and the jitter value is not good. For the optical disc (M) (FIG. 1) that is judged / necessary to detect / inspect each jitter value, the following steps are performed based on the control of the program in the CPU 10. The following steps are performed by the CPU 10 and the second memory circuit 12.

First, an initial value is set by a program in the CPU 10 and i _a = −4 is set (FIG. 6B: S141). For example, the value of “DEFOCUS = 2% × i _a ” is set to “FOCUS_BIAS” (S142). The jitter value is measured by the OPU 2 (S143), and the result is stored in the second memory circuit 12 as “jitter (i _a )” (S144).

“I _a ” is incremented by _a program in the CPU 10 (S141, S142 to S146). Increment means that a numerical value is increased by a predetermined size when an iterative process or the like is performed by programming.

When “i _a <5” is set (S146: NO), the value of “DEFOCUS = 2% × i _a ” is set to “FOCUS_BIAS” (S142), and jitter is again measured in OPU2 (S143). The result is stored in the second memory circuit 12 as “jitter (i _a )” (S144). When “i _a ≧ 5” is satisfied (S146: YES), the minimum value is obtained from “jitter (i _a )”, and “i _a ” at that time is set to “i _a min” (FIG. 6A: S150). . When “i _a ≧ 5” is satisfied (FIG. 6B, S146: YES), the maximum value is obtained from “jitter (i _a )”, and “i _a ” at that time is set to “i _a max” ( FIG. 6A: S150).

Next, based on the difference value jitter (i _a d) between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min) in each detected jitter value (S160), the optimum data is determined. Set the focus value.

When each jitter value is detected by changing the defocus value within a predetermined range (FIG. 6A: S140, FIG. 6B: S141 to S146), the maximum jitter value is detected from the detected jitter values. The jitter (i _a max) and the minimum jitter value jitter (i _a min) are selected (FIG. 6A: S150).

When the selection setting operation in step S150 is performed, [jitter (i _a max) −jitter (i _a min)> jitter (i _a s)] is set (S160: YES) or [jitter (i _a max) −jitter (i _a min)> jitter (i _a s)] is determined (S160: NO). In S160 of the step, when it is determined that the _{[jitter (i a max) -jitter (} i a min)> jitter (i a s) ] (S160: YES), the minimum jitter value jitter _(i a min) The corresponding defocus value is set as the optimum defocus value (S170). Alternatively, if it is determined in step S160 that [jitter (i _a max) −jitter (i _a min)> jitter (i _a s)] is not satisfied (S160: NO), the reference value 0 of the defocus value is optimized. The defocus value is set (S180).

By performing the defocus value adjusting method of the optical disc apparatus 1 in this way, an optimal defocus value is set for the optical disc apparatus 1. If necessary, a jitter value is detected every time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0 and centering on the defocus value reference value 0, Since the optimum defocus value is set based on the difference value jitter (i _a d) between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min) in each detected jitter value. An optimum defocus value is set for the optical disc apparatus 1. Since an optimal defocus value is set for the optical disc apparatus 1, the OPU 2 performs a stable focusing servo operation on the optical disc M. In addition, the defocus value setting operation in the optical disc apparatus 1 can be easily performed.

Further, after the optical disc (M) is completely installed in the optical disc apparatus 1, each signal is read from the optical disc (M) to detect each jitter value, and the defocus adjustment of the OBL 4 with respect to the optical disc (M) is performed. When defocusing is performed, defocus adjustment is performed within a time period exceeding 0 second and within approximately 20 seconds. More specifically, after the optical disk (M) is completely installed in the optical disk apparatus 1, the defocus value reference value 0 including the defocus value reference value 0 (FIGS. 8, 9, and 10) is provided. The defocus value is changed stepwise within a predetermined range of values centered on (FIG. 6A: S140, FIG. 6B: S141-S146), and each signal is read from the optical disc (M) (FIG. 1). to detect each jitter value, a maximum jitter value jitter in each jitter value detected _(i a max) (FIGS. 8, 9, 10) the value of the difference between the minimum jitter value jitter _(i a min) jitter ₍ i _a d) on the basis of (Fig. 6A: S160), the optical disc (M) (Fig. 1 when causing the optimum defocus value adjustment of OBL4 respect), 0 seconds in the time of 15 seconds or less substantially exceeded defocus It is preferred to terminate the adjustment.

As described above, since the time required for the defocus value adjustment method of the optical disc apparatus 1 is set to a short time, the defocus adjustment can be performed in the optical disc apparatus 1 without waiting for a long time for the defocus adjustment. The setting process when it is performed ends immediately. After the optical disk (M) is completely installed in the optical disk apparatus 1, the defocus value is set within a predetermined range of values including the defocus value reference value 0 and the defocus value reference value 0 as the center. stepwise changed, the optical disc from the (M) by reading the signals from detecting the jitter value, the maximum jitter value jitter in each jitter value detected _(i a max) and the minimum jitter value jitter _(i a min) When the defocus adjustment of the OBL 4 on the optical disc (M) is performed based on the difference value jitter (i _a d), the time is over 0 seconds and within about 20 seconds, preferably over 0 seconds. Since defocus adjustment is performed within 15 seconds, main data / information / information on the optical disk (M) after the optical disk (M) is installed in the optical disk apparatus 1 No. until begins to read, that the optical disc apparatus 1 is severely wait a long time for the defocus adjustment for automatic execution is avoided.

8, CPU 10 in (FIG. 1), _{[jitter (i a max) -jitter (} i a min)> jitter (i a s) ] and if it is determined (Fig. 6A, S160: YES) Jitter It is a characteristic view which shows the relationship between a value and a defocus value.

When performing defocus adjustment of the OBL 4 on the optical disc (M) (FIG. 1), as shown in FIG. 8, the difference value jitter between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min). When (i _a d) is set to a value larger than _a predetermined value jitter (i _a s), _a defocus value corresponding to the minimum jitter value jitter (i _a min) is set to an optimum defocus value. Let it be set as

The minimum jitter value jitter (i _a min) is smaller than the jitter value jitter (i _a f), for example, which is smaller than the maximum jitter value jitter (i _a max) by, for example, the determination value jitter (i _a s). In such a case, the focusing servo circuit 31 sets a defocus value corresponding to the minimum jitter value jitter (i _a min), that is, a defocus value larger by + 6% than the reference value 0 as the optimum defocus value. The operation is performed in the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _a max) −jitter (i _a min)”. When the value of “jitter (i _a max) −jitter (i _a min)” exceeds _a certain value jitter (i _a s), for example, “DEFOCUS” is set to “2% × i _a min”. Thus, the defocus adjustment is completed.

  When the defocus value setting operation is performed in this manner, a defocus value that is + 6% larger than the reference defocus value 0 is set in the focusing servo circuit 31, and the focusing servo circuit 31 is centered on the set defocus value. Focusing servo operation by is performed.

By performing the defocus value adjusting method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable focusing servo operation on the optical disc (M). Maximum jitter value jitter _(i a max) and the minimum jitter value jitter _(i a min) the difference between the value jitter _(i a d) is set to a value larger than a predetermined prescribed value jitter _(i a s) The optical disc (M) is an optical disc (M) having poor jitter characteristics. When the bad signal from the optical disc (M) jitter characteristics is read, since the defocus value is set corresponding to the minimum jitter value jitter (i a _min) as the optimum defocus value at stable focusing servo operation OPU2 Executed.

In S160 of the step shown in FIG. 6A, _{[jitter (i a max) -jitter (} i a min)> jitter (i a s) ] If the decision is not: a (S160 NO), the reference defocus value 0 The optimum defocus value is set (S180).

9, in CPU 10 (FIG. 1), _{[jitter (i a max) -jitter (} i a min)> jitter (i a s) ] If it is determined not to be (Fig. 6A, S160: NO) It is a characteristic view which shows the relationship between the jitter value of this, and a defocus value.

When performing defocus adjustment of the OBL 4 on the optical disc (M) (FIG. 1), as shown in FIG. 9, the difference value jitter between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min). When (i _a d) is set to a small value equal to or smaller than _a predetermined value jitter (i _a s), the defocus value reference value 0 is set as the optimum defocus value. When the maximum value-minimum value (MAX-MIN) in each jitter value is equal to or less than a certain value, the defocus value is set to ± 0. For example, when the jitter value of the waveform shown in FIG. 9 is detected, the jitter value jitter (i _a o) at the defocus value reference value 0 is set to a value larger than the predetermined jitter value jitter (i _a f), and maximum jitter value jitter _(i a max) and the minimum jitter value jitter _(i a min) the difference between the value jitter _(i a d) is set to a predetermined prescribed value jitter _(i a s) following a small value In this case, the defocus value is set to ± 0. Alternatively, for example, the jitter value of the waveform shown in FIG. 9 is detected, and each jitter value is set to a value that is all larger than _a predetermined jitter value jitter (i _a f), and the maximum jitter value jitter (i _a max) When the difference value jitter (i _a d) from the minimum jitter value jitter (i _a min) is set to a small value equal to or smaller than _a predetermined value jitter (i _a s), the defocus value is ± 0. To set.

The minimum jitter value jitter (i _a min) is larger than the jitter value jitter (i _a f), for example, which is smaller than the maximum jitter value jitter (i _a max), for example, by a determination value jitter (i _a s). In such a case, since the change of the jitter value is small, the optical disc apparatus 1 performs the operation of setting the reference defocus value as the optimum defocus value in the focusing servo circuit 31.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _a max) −jitter (i _a min)”. When the value of “jitter (i _a max) −jitter (i _a min)” is less than or equal to _a certain value jitter (i _a s),
Set “DEFOCUS” to 0. Thus, the defocus adjustment is completed.

  When the defocus value setting operation is performed in this manner, the focusing servo operation by the focusing servo circuit 31 is performed around the reference defocus value 0. Since the focusing servo operation centered on the reference defocus value 0 is performed, the focusing control in the OPU 2 can be stably performed.

By performing the defocus value adjustment method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable focusing servo operation on the optical disc M. Maximum jitter value jitter _(i a max) and the minimum jitter value jitter _(i a min) the difference between the value jitter _(i a d) is set to a predetermined prescribed value jitter _(i a s) following a small value The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disk M having relatively good jitter characteristics, the optical disk apparatus 1 is set with the reference value 0 of the defocus value as the optimum defocus value. The focusing servo operation performed is executed in OPU2. In addition, it is possible to easily set the defocus value in the optical disc apparatus 1.

When performing defocus adjustment of the OBL 4 on the optical disc (M) (FIG. 1), as shown in FIG. 10, the difference value jitter between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min) When (i _a d) is a small value equal to or smaller than _a predetermined value jitter (i _a s), the defocus value reference value 0 is set as the optimum defocus value. When the maximum value-minimum value (MAX-MIN) in each jitter value is equal to or less than a certain value, the defocus value is set to ± 0. For example, when the jitter value of the waveform shown in FIG. 10 is detected, the jitter value jitter (i _a o) at the reference value 0 of the defocus value is larger than the predetermined jitter value jitter (i _a f), and maximum jitter value jitter _(i a max) and the minimum jitter value jitter _(i a min) the difference between the value jitter _(i a d) is set to a predetermined prescribed value jitter _(i a s) following a small value In this case, the defocus value is set to ± 0. In such a case, since the change of the jitter value is small, the optical disc apparatus 1 performs the operation of setting the reference defocus value as the optimum defocus value in the focusing servo circuit 31.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _a max) −jitter (i _a min)”. When the value of “jitter (i _a max) −jitter (i _a min)” is equal to or smaller than _a predetermined value jitter (i _a s), “DEFOCUS” is set to 0. Thus, the defocus adjustment is completed.

  When the defocus value setting operation is performed in this manner, the focusing servo operation by the focusing servo circuit 31 is performed around the reference defocus value 0. Since the focusing servo operation centered on the reference defocus value 0 is performed, the focusing control in the OPU 2 can be stably performed.

By performing the defocus value adjustment method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable focusing servo operation on the optical disc M. Maximum jitter value jitter _(i a max) and the minimum jitter value jitter _(i a min) the difference between the value jitter _(i a d) is set to a predetermined prescribed value jitter _(i a s) following a small value The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disk M having relatively good jitter characteristics, the optical disk apparatus 1 is set with the reference value 0 of the defocus value as the optimum defocus value. The focusing servo operation performed is executed in OPU2. In addition, it is possible to easily set the defocus value in the optical disc apparatus 1.

When the optical disc (M) is completely installed in the optical disc apparatus 1 and each signal is read from the optical disc (M) to detect each jitter value, and the defocus adjustment of the OBL 4 with respect to the optical disc (M) is performed. In addition, the defocus adjustment is performed within a time period exceeding 0 second and within approximately 15 seconds. More specifically, after the optical disk (M) is completely installed in the optical disk apparatus 1, the defocus value reference value 0 including the defocus value reference value 0 (FIGS. 8, 9, and 10) is provided. The defocus value is changed stepwise within a predetermined range of values centered on (FIG. 6A: S140, FIG. 6B: S141-S146), and each signal is read from the optical disc (M) (FIG. 1). to detect each jitter value, a maximum jitter value jitter in each jitter value detected _(i a max) (FIGS. 8, 9, 10) the value of the difference between the minimum jitter value jitter _(i a min) jitter ₍ i _a d) on the basis of (Fig. 6A: S160), the optical disc (M) (Fig. 1 when causing the optimum defocus value adjustment of OBL4 respect), 0 seconds in the time of 10 seconds approximately exceeded defocus It is preferred to terminate the adjustment.

As described above, since the time required for the defocus value adjustment method of the optical disc apparatus 1 is set to a short time, the defocus adjustment can be performed in the optical disc apparatus 1 without waiting for a long time for the defocus adjustment. The setting process when it is performed ends immediately. After the optical disc (M) is completely installed in the optical disc apparatus 1, the defocus value is set within a predetermined range of values including the defocus value reference value 0 and the defocus value reference value 0 as the center. stepwise changed, the optical disc from the (M) by reading the signals from detecting the jitter value, the maximum jitter value jitter in each jitter value detected _(i a max) and the minimum jitter value jitter _(i a min) When the defocus adjustment of the OBL 4 on the optical disc (M) is performed based on the difference value jitter (i _a d), the time is over 0 seconds and within about 15 seconds, preferably over 0 seconds. Since defocus adjustment is performed within 10 seconds, the main data / information / information on the optical disk (M) after the optical disk (M) is installed in the optical disk apparatus 1 No. until begins to read, that the optical disc apparatus 1 is severely wait a long time for the defocus adjustment for automatic execution is avoided.

As described above, when the defocus adjustment of the OBL 4 is performed on the optical disc (M) (FIG. 1) and the optical disc apparatus 1 is set with the optimum defocus value, first, the defocus value reference value 0 (FIG. 1) is set. 8, FIG. 9, and FIG. 10), a jitter value is detected based on a reference value 0 of the detected defocus value, and a jitter value jitter (i _a o) based on a predetermined jitter value jitter (i _a ) When the value is larger than f), the defocus value is within a predetermined range (eg, −8% to +8% / − 10% to + 10%) including the reference value 0 of the defocus value. Each jitter value detection step of detecting each jitter value every time the value is changed stepwise is executed.

Thus, the optimum defocus value is set in the optical disc apparatus 1 by performing the defocus value adjustment method of the optical disc apparatus 1 (FIG. 1). When the OBL 4 defocus adjustment is performed on the optical disc (M) and the optimum defocus value is set in the optical disc apparatus 1, first, the jitter value jitter (i _a o) based on the defocus value reference value 0 is set. ) Is detected (FIG. 6A: S120). As shown in FIGS. 8, 9 and 10, the jitter value jitter (i _a o) based on the defocus reference value 0 is set to a value larger than _a predetermined jitter value jitter (i _a f). The optical disc (M) (FIG. 1) is an optical disc (M) that needs to detect / inspect each jitter value corresponding to each defocus value. As shown in FIG. 6A, when the jitter value jitter (i _a o) based on the reference value 0 of the detected defocus value is larger than _a predetermined jitter value jitter (i _a f). (S130: YES), and then a predetermined range including a defocus value reference value 0 (example:
Each jitter value is detected each time the defocus value is changed stepwise within a numerical value of −8% to +8% / − 10% to + 10%) (FIG. 6A: S140, FIG. 6B: S141 to S146), Each of the optimum defocus values is set based on the difference value jitter (i _a d) between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min) in each detected jitter value. A jitter value detection / comparison determination / optimum value setting step is executed (FIG. 6A: S140, FIG. 6B: S141 to S146, FIG. 6A: S150, S160, S170 / S180).

  Further, the defocus value is set within a predetermined range (eg, −10% to +10% / − 8% to + 8%) including the defocus value reference value 0 (FIG. 8, FIG. 9, FIG. 10). The defocus value increment when changing in stages is set to a value in the range of 0.5% to 5% of the entire defocus value, specifically to a value in the range of 1% to 4%. Is done. If the defocus value increment is set to a fine increment of less than 0.5% of the entire defocus value, for example, a large amount of data is acquired, and there is a concern that the time required for defocus adjustment may be increased. The In addition, when the defocus value increment is a coarse increment that exceeds 5% of the entire defocus value, for example, there is a concern that accurate defocus adjustment may not be performed because the number of acquired data is insufficient. . Defocus adjustment is performed by setting the defocus value increment to a value within the range of 1% to 4% of the entire defocus value, preferably 2% of the defocus value increment. The defocus adjustment is performed with a relatively high accuracy, and the time required for the defocusing is not significantly increased.

As shown in FIG. 11 and FIG. 12, the jitter value is changed every time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0 and the defocus value reference value 0 as the center. Before performing the detection operation, the jitter value is detected based on the reference value 0 of the defocus value, and the jitter value jitter (i _a o) based on the detected reference value 0 of the defocus value is determined in advance. when it is a predetermined jitter value jitter (i a _f) following a small value, thereby setting the reference value 0 of the defocus value as the optimum defocus value.

More specifically, when the defocus adjustment of the OBL 4 is performed on the optical disc M (FIG. 1) and the optimum defocus value is set in the optical disc apparatus 1, first, the defocus value reference value 0 (FIG. 11). And a jitter value jitter (i _a o) based on a reference value 0 of the detected defocus value is smaller than _a predetermined jitter value jitter (i _a f). Each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0, each jitter value detection step is omitted without detecting each jitter value. detection process of the jitter value jitter based on the reference value 0 of the focus value _(i a o), and a predetermined jitter value jitter predetermined and _(i a f) defocus Immediately after the comparison determination step of jitter value jitter based on the reference value 0 of the value (i a _o), to set the reference value 0 of the defocus value as the optimum defocus value.

When the defocus value is ± 0, when the jitter value jitter (i _a o) is set to a small value equal to or smaller than _a predetermined jitter value jitter (i _a f), the optimum defocus value is ± Set to 0. When an optical disc M with good jitter characteristics is used, priority is given to the stability of the focusing servo.

By performing the defocus value adjusting method of the optical disc apparatus 1 (FIG. 1) in this way, when the optical disc M having good jitter characteristics is used, the defocus value is quickly set and the optical disc apparatus 1 is used. The OPU 2 that constitutes a stable focusing servo operation with respect to the optical disc M. When defocus adjustment of OBL 4 is performed on the optical disc M and the optical disc apparatus 1 is set to an optimum defocus value, first, a jitter value jitter (i _a o) based on the defocus reference value 0 is first set. It detects (FIG. 6A: S120). As shown in FIG. 11, the optical disc M in which the jitter value jitter (i _a o) based on the reference value 0 of the defocus value is set to a smaller value than _a predetermined jitter value jitter (i _a f) (see FIG. 1). ) Is an optical disc M with good jitter characteristics.

When a signal is read from the optical disk M having good jitter characteristics, each jitter value is not detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0. Detection of the jitter value jitter (i _a o) based on the defocus value reference value 0, omitting the value detection / comparison determination step (FIG. 6A: S140, FIG. 6B: S141 to S146, FIG. 6A: S150, S160) Step (FIG. 6A: S120) and a step of comparing and determining a predetermined jitter value jitter (i _a f) and _a jitter value jitter (i _a o) based on a defocus value reference value 0 (FIG. 6A) : Immediately after S130), the optical disc apparatus 1 is set with the reference value 0 of the defocus value as the optimum defocus value (FIG. 6A: S180). Setting time of the defocus value in the optical disc apparatus 1 is reduced. Further, when a signal is read from the optical disc M with good jitter characteristics, the defocus value reference value 0 is set to the optical disc apparatus 1 as an optimum defocus value, so that the focusing servo operation of the OPU 2 does not cause a problem and is stable. The focusing servo operation performed is executed in OPU2.

Further, when the defocus adjustment of the OBL 4 is performed on the optical disc M (FIG. 1) and the optical disc apparatus 1 is set with the optimum defocus value, first, based on the defocus value reference value 0 (FIG. 12). The jitter value is detected, and the jitter value jitter (i _a o) based on the reference value 0 of the detected defocus value is set to a small value equal to or smaller than _a predetermined jitter value jitter (i _a f). Sometimes, each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0, each jitter value detection step is omitted without detecting each jitter value. detection process of the jitter value jitter based on the reference value 0 of the _(i a o), and a predetermined jitter value predetermined jitter _(i a f) and the defocus value of the reference value Immediately after the jitter value jitter (i a _o) and the comparative determination step based on the, to set the reference value 0 of the defocus value as the optimum defocus value.

When the defocus value is ± 0, when the jitter value jitter (i _a o) is set to a small value equal to or smaller than _a predetermined jitter value jitter (i _a f), the optimum defocus value is ± Set to 0. When an optical disc M with good jitter characteristics is used, priority is given to the stability of the focusing servo.

By performing the defocus value adjusting method of the optical disc apparatus 1 (FIG. 1) in this way, when the optical disc M having good jitter characteristics is used, the defocus value is quickly set and the optical disc apparatus 1 is used. The OPU 2 that constitutes a stable focusing servo operation with respect to the optical disc M. When defocus adjustment of OBL 4 is performed on the optical disc M and the optical disc apparatus 1 is set to an optimum defocus value, first, a jitter value jitter (i _a o) based on the defocus reference value 0 is first set. It detects (FIG. 6A: S120). As shown in FIG. 12, the optical disc M in which the jitter value jitter (i _a o) based on the reference value 0 of the defocus value is set to a smaller value than _a predetermined jitter value jitter (i _a f) (see FIG. 1). ) Is an optical disc M with good jitter characteristics. Also, for example, as shown in FIG. 12, all the jitter values between the maximum jitter value jitter (i _a max) and the minimum jitter value jitter (i _a min) are all set to a predetermined jitter value jitter (i _a f) The optical disk M (FIG. 1) having a small value equal to or smaller than the value is an optical disk M having good jitter characteristics.

When a signal is read from the optical disk M having good jitter characteristics, each jitter value is not detected each time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value 0. Detection of the jitter value jitter (i _a o) based on the defocus value reference value 0, omitting the value detection / comparison determination step (FIG. 6A: S140, FIG. 6B: S141 to S146, FIG. 6A: S150, S160) Step (FIG. 6A: S120) and a step of comparing and determining a predetermined jitter value jitter (i _a f) and _a jitter value jitter (i _a o) based on a defocus value reference value 0 (FIG. 6A) : Immediately after S130), the optical disc apparatus 1 is set with the reference value 0 of the defocus value as the optimum defocus value (FIG. 6A: S180). Setting time of the defocus value in the optical disc apparatus 1 is reduced. Further, when a signal is read from the optical disc M with good jitter characteristics, the defocus value reference value 0 is set to the optical disc apparatus 1 as an optimum defocus value, so that the focusing servo operation of the OPU 2 does not cause a problem and is stable. The focusing servo operation performed is executed in OPU2.

  Since the defocus value ± 0 is first measured and set, the measurement time for detecting the jitter value can be shortened. The defocus adjustment can be performed by the optical disc apparatus 1 including the OPU 2 only for the optical disc (M) that is estimated / determined that the jitter value is not good and each jitter value needs to be detected / inspected. Since the defocus adjustment is performed only for the optical disc (M) that is estimated / determined that the jitter value is not good and each jitter value needs to be detected / inspected, the initial measurement time of the optical disc M with good jitter characteristics in the OPU 2 Can be shortened. Further, since the defocus value is set to ± 0 for the optical disc M having good jitter, stable focusing servo can be executed for the optical disc M having good jitter. When the optical disc apparatus 1 is equipped with an optical disc M in which the jitter value does not substantially change, the defocus value for the focusing servo circuit 31 is set to ± 0, so that a focus drop, so-called F drop does not occur, and stable focusing servo can be performed. It becomes executable.

  Defocusing refers to the focus Ls (FIGS. 1, 2 and 4) of the laser light L emitted from the LD3 of the OPU2 (FIG. 1) and transmitted through the OBL4 with respect to the pit Mt of the optical disk (M) being followed. This means that the data recorded on the optical disk (M) cannot be read.

As described above, the defocus value adjusting method of the optical disc apparatus 1 detects the jitter value every time the defocus value is changed by the predetermined percentage within the predetermined range centered on the reference value 0 of the defocus value. Thus, an optimum defocus value setting operation is performed. Before performing such an operation, a jitter value detection operation is performed in a state where the reference defocus value is set to 0 and the defocus value is set. When the detected jitter value jitter (i _a o) is set to a small value equal to or smaller than the predetermined value jitter (i _a f), that is, when it is determined that the reproduction characteristic of the optical disc M is good, the reference data is unchanged. The operation of setting the focus value 0 as the optimum defocus value is performed in the optical disc apparatus 1.

When the jitter value jitter (i _a o) detected / set for performing the determination operation is detected as a small jitter value equal to or smaller than _a predetermined jitter value jitter (i _a f), for example, the optical disk M is changed to a benign disk. Therefore, the reproduction operation can be performed without any trouble without performing the defocus value selection operation.

  After the optical disc M with good jitter characteristics is completely installed in the optical disc apparatus 1, when the OBL 4 defocus adjustment is performed on the optical disc M with good jitter characteristics within the optical disc apparatus 1, the time exceeds 0 second and is approximately 3 The defocus adjustment is performed within a time within seconds, preferably within a time exceeding 0 seconds and within approximately 1 second.

  When the defocus adjustment of the OBL 4 with respect to the optical disc M is performed after the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1, it is within 0 seconds and within about 3 seconds, preferably 0 seconds. Since the defocus adjustment is performed within a time of approximately 1 second exceeding the time period, the optical disk apparatus 1 starts to read the main data / information / signal of the optical disk M after the optical disk M is installed in the optical disk apparatus 1. There is no need to wait for a long time for the defocus adjustment that 1 automatically executes. The defocus adjustment in the optical disc apparatus 1 when the optical disc M having good jitter characteristics is installed in the optical disc apparatus 1 is quickly completed in a short time.

  Next, a state when a track jump of the OPU 2 is performed when a defocus value other than the reference value 0 is set will be described.

  First, defocus adjustment of the optical disc apparatus 1 (FIG. 1) is performed. At this time, the defocus value is set to a numerical value other than the reference value 0. Before starting the track jump, the reference value 0 is set as the defocus value. Perform a track jump operation. After the track jump, the defocus value is set to a value other than the original reference value 0.

  The operation of the optical disc apparatus 1 from the start to the end of the track jump process will be described in detail. Among the defocus values within a predetermined range, the optimum defocus value is deviated to any value other than the reference value 0. When the numerical value is set (FIG. 6A: S170, FIG. 7, S191: NO, FIG. 8), the defocus value is temporarily set when the OPU 2 performs a track jump on the optical disc (M) (FIG. 1). Therefore, the reference value is set to 0. After the defocus value is temporarily set to the reference value 0 (FIG. 7: S192), the OPU 2 (FIG. 1) is caused to execute a track jump (FIG. 7: S193).

  When the defocus value is set in the optical disc apparatus (FIG. 1) as in steps S191 and S192 of FIG. 7, any defocus value other than the defocus value reference value 0 is selected from the defocus values within the predetermined range. Even if a biased numerical value (for example, + 6%) is set as the optimum defocus value, the track jump of the OPU 2 to the optical disc (M) is performed well. When the defocus adjustment of the OPU 2 with respect to the optical disc (M) is performed and the defocus value is set to a deviated numerical value (+ 6%) other than the reference value 0, the track jump of the OPU 2 to the optical disc (M) is performed. In some cases, the track of the optical disk (M) cannot be captured. However, even when the defocus value is set to a deviated numerical value other than the reference value 0, when the OPU 2 performs a track jump, by temporarily setting the defocus value to the reference value 0, The track jump of the OPU 2 with respect to the optical disc (M) is likely to be performed normally.

  After the track jump of the OPU 2 to the optical disc (M) (FIG. 1) is executed (FIG. 7: S193) and the track jump operation is completed, the defocus value is again an original biased value other than the reference value 0 (example: + 6%) (FIG. 7: S195, FIG. 8). As the initial optimum defocus value is set to a deviated numerical value other than the reference value 0 (FIG. 7, S194: NO, FIG. 8), the defocus value is set to a value other than the reference value 0 again after the end of the track jump. It returns to the original biased value (example: + 6%) (FIG. 7: S195).

Thereby, the optimum defocus value for the optical disc apparatus 1 is set again. When the OPU 2 track jump is not performed on the optical disc (M), the deviated value other than the reference value 0 of the defocus value is set again as the optimum defocus value in the optical disc apparatus 1, so that the optical disc (M) is set. The OBL2 focusing adjustment of the OPU2 is performed well. In addition, since the defocus value other than the reference value 0 previously stored in the second memory circuit 12 is set again as the optimum defocus value in the optical disc apparatus 1, the optimum defocus value can be quickly reset. Is called.

  Next, a state when the track jump of the OPU 2 is performed when the optimum defocus value is set to the reference value 0 will be described. When the optimal defocus value is set to the reference value 0, the operation of the optical disc apparatus 1 from the start to the end of the track jump process will be described in detail. The optimal defocus value is set to the reference value 0. If it is performed (FIG. 7, S191: YES, FIG. 9, FIG. 10, FIG. 11, FIG. 12), the track jump is executed by OPU2 (FIG. 1) without changing the defocus value (FIG. 7: S193). ). Since the optimum defocus value continues to be set to the reference value 0, the track jump of the OPU 2 with respect to the optical disc M / (M) (FIG. 1) is normally performed. As the initial optimum defocus value is set to the reference value 0 (FIG. 7, S194: YES, FIGS. 9, 10, 11, and 12), the defocus value is changed after the track jump ends. The optimal defocus value is maintained at the reference value 0 without any change.

  Next, a detrack value adjustment method of the disk device 1 will be described.

  FIG. 13A is a flowchart showing an embodiment of a detrack value adjusting method for a disk device, FIG. 13B is a flowchart showing each jitter value detecting step of the detrack value adjusting method for the disk device, and FIG. FIG. 15 is a flowchart showing the relationship between the detrack value and the jitter value, and FIG. 16 is a graph showing the relationship between the detrack value and the jitter value. 17 is a graph showing the relationship between the detrack value and the jitter value, FIG. 18 is a graph showing the relationship between the detrack value and the jitter value, and FIG. 19 is a graph showing the relationship between the detrack value and the jitter value. It is a graph which shows the relationship.

  In conjunction with the flowcharts shown in FIGS. 13A, 13B, and 14, the detrack value adjustment method of the optical disc apparatus 1 will be described with reference to the drawings.

  The detrack adjustment method of the optical disc apparatus 1 based on the jitter value is performed as follows. For example, the offset adjustment of the track is performed at the time of reading the initial data of the OPU 2 in the vicinity of the inner periphery Mc of the disk immediately before the data reproduction of the reproducing / recording optical disk M (FIG. 1) or immediately after the initial data reading. At this time, for example, a detrack value adjustment step corresponding to the reference voltage value (Vref) is performed. For example, a signal having a substantially laid-down S-curve with a detrack value of −50% to + 50% centered on a reference value 0, which is a reference voltage value (Vref), is read in the optical disc apparatus 1.

  The optical disk device 1 is used to perform tracking adjustment of the OBL 4 with respect to the signal surface portion Ms of the optical disk M. A detrack value adjustment method in the optical disc apparatus 1 is performed using the optical disc apparatus 1.

For example, when the optical disk device 1 is powered on, preparation for executing the detrack value adjustment method of the optical disk device 1 is started. When the optical disk device 1 is turned on and the optical disk device 1 is turned on, data such as various information is sent from the memory circuit 11 such as the ROM 11 to the system control circuit 10. At this time, for example, various data such as a predetermined jitter value jitter (i _b f) and determination value jitter (i _b s) are sent to the system control circuit 10 and set in the system control circuit 10 (FIG. 13A: S210).

The detrack value adjustment method of the optical disc apparatus 1 (FIG. 1) uses the optical disc apparatus 1 having the OPU 2 having the OBL 4 to detect the jitter value of the signal read from the optical disc M, and detects the detected jitter. When the OBL 4 of the OPU 2 is focused on the signal surface portion Ms of the optical disk M based on the value, the detrack value used to move the OBL 4 along the radial direction Dt of the optical disk M is adjusted to This is a detrack value adjustment method of the optical disc apparatus 1 that performs tracking adjustment of OBL4. The following detrack value setting process is performed.

When the optical disc apparatus 1 is equipped with the optical disc M, an operation for causing the optical disc apparatus 1 to set an appropriate detrack value is substantially started. First, by using the optical disk device 1, a track bias so-called detrack is applied to a tracking coil (TRACKINGCOIL) 72, and jitter is measured. When the optical disk apparatus 1 is to perform the detrack value adjustment method, first, jitter is detected / measured with the detrack value ± 0 (FIG. 13A: S220). At this time, as shown in FIG. 18 or FIG. 19, for example, the jitter value jitter (i _b o) at the detrack value ± 0 is set to a small value equal to or less than the specified value jitter (i _b f), and the optical disc has good jitter characteristics. When it is determined by the program in the CPU 10 that it is M (FIG. 1) (FIG. 13A, S230: NO), the detrack value is set to 0 (FIG. 13A: S280), and the detrack adjustment is completed.

  This optical disc apparatus 1 (FIG. 1) has different data depending on the optical disc M having good jitter characteristics and the optical disc (M) that is estimated / determined that the jitter characteristics are not good and each jitter value needs to be detected / inspected. Adjust the track value.

When performing the detrack value adjustment method in the optical disc apparatus 1 using the optical disc apparatus 1, the jitter values are detected / measured as necessary, for example, as shown in FIGS. More specifically, the jitter value jitter (i _b o) at the detrack value ± 0 is set to a value larger than the specified value jitter (i _b f), and the jitter characteristic is not good in the program in the CPU 10 (FIG. 1). The following measurement is performed on the optical disc (M) that is estimated / determined and determined to require detection / inspection of each jitter value. First, when a jitter value is detected by reading a signal from the optical disc (M), a detrack value within a predetermined range is changed. More specifically, when a jitter value is detected by reading a signal from the optical disc (M), the detrack value reference value 0 including the detrack value reference value 0 (FIGS. 15, 16, and 17) is set. The detrack value is changed step by step within a numerical value within a predetermined range centered (FIG. 13A: S240, FIG. 13B: S241 to S246). Each time the detrack value is changed in stages, the jitter value is detected.

  The operation for setting the detrack value is performed by the detrack value setting circuit 22 in the state of performing the reproduction operation of the signal recorded on the optical disc (M) (FIG. 1). In the detrack value setting circuit 22, the detrack value set for the tracking servo circuit 32 is incremented by 2% from -8% to + 8% with respect to the reference value 0 (FIGS. 15, 16, and 17). Make changes. At the same time, the jitter value of the reproduction signal is detected by the jitter measuring circuit 9 corresponding to each detrack value, whereby the detrack value is set.

  More specifically, the detrack value setting circuit 22 sets the detrack value for the tracking servo circuit 32 to a value that is about -8% lower than the reference value 0, and the signal recorded on the optical disc (M) A reproduction operation is performed, and the jitter value included in the reproduction signal is detected by the jitter measurement circuit 9. The jitter value thus detected is stored in the memory circuit 12 such as the RAM 12 together with the detrack value.

  The detrack value is changed in steps of 2% from −8% to + 8% with respect to the reference value 0, and the jitter value corresponding to each detrack value is detected, and the jitter value together with the detrack value is stored in the memory circuit 12. The operation of memorizing is performed repeatedly.

  For an optical disc (M) in which an operation for setting a detrack value is started in the optical disc apparatus 1 and it is determined that each jitter value needs to be detected / inspected during the process of the detrack adjustment method of the optical disc apparatus 1 First, every time the detrack value is changed within a predetermined range, an operation of detecting a jitter value is performed (FIG. 13A: S240, FIG. 13B: S241 to S246). The predetermined range is, for example, a detrack value between −10% and + 10% set for the tracking servo circuit 32 with respect to the reference value when the detrack value 0 is determined as the reference value. (FIGS. 15, 16, and 17). The predetermined range of the detrack value is, for example, a range between −8% and + 8% set for the tracking servo circuit 32 with respect to the reference value when the detrack value 0 is determined as the reference value. Is done.

  For example, when the detrack value is set smaller than −10%, the normal tracking servo function may not work. For example, when the detrack value is set to be larger than + 10%, the normal tracking servo function may not work. For this reason, it is preferable that a detrack value between −10% and + 10% around the reference value 0 of the detrack value is set for the tracking servo circuit 32. Preferably, a detrack value between −8% and + 8% around the reference value 0 of the detrack value is set for the tracking servo circuit 32, so that a normal tracking servo function works.

For example, it is estimated that the jitter value jitter (i _b o) at the detrack value reference value 0 (FIGS. 15, 16, and 17) is larger than the specified value jitter (i _b f), and the jitter value is not good. For the optical disc (M) (FIG. 1) that is judged / necessary to detect / inspect each jitter value, the following steps are performed based on the control of the program in the CPU 10. The following steps are performed by the CPU 10 and the second memory circuit 12.

First, an initial value is set by a program in the CPU 10, and i _b = −4 is set (FIG. 13B: S241). Further, for example, the value of “DETRACK = 2% × i _b ” is set to “TRACK_BIAS” (SET) (S242). The jitter value is measured by the OPU 2 (S243), and the result is stored in the second memory circuit 12 as “jitter (i _b )” (S244).

“I _b ” is incremented by a program in the CPU 10 (S241, S242 to S246).

When “i _b <5” is satisfied (S246: NO), the value of “DETRACK = 2% × i _b ” is set to “TRACK_BIAS” (S242), and the jitter is again measured by OPU2 (S243). The result is stored in the second memory circuit 12 as “jitter (i _b )” (S244). When “i _b ≧ 5” is satisfied (S246: YES), the minimum value is obtained from “jitter (i _b )”, and “i _b ” at that time is set to “i _b min” (FIG. 13A: S250). . If “i _b ≧ 5” (FIG. 13B, S246: YES), the maximum value is obtained from “jitter (i _b )”, and “i _b ” at that time is set to “i _b max” ( FIG. 13A: S250).

Next, based on the difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) in each detected jitter value (S260), the optimum data is determined. Set the track value.

When each jitter value is detected by changing the detrack value within a predetermined range (FIG. 13A: S240, FIG. 13B: S241 to S246), the maximum jitter value is detected from the detected jitter values. jitter (i _b max) and minimum jitter value jitter (i _b m
in) is selected (FIG. 13A: S250).

When the selection setting operation in step S250 is performed, [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] is set (S260: YES) or [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] is not determined (S260: NO). If it is determined in step S260 that [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] (S260: YES), the minimum jitter value jitter (i _b min) is set. The corresponding detrack value is set as the optimum detrack value (S270). Alternatively, if it is determined in step S260 that [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] is not satisfied (S260: NO), the detrack value reference value 0 is optimized. A detrack value is set (S280).

By performing the detrack value adjustment method of the optical disc apparatus 1 in this way, an optimal detrack value is set for the optical disc apparatus 1. If necessary, the jitter value is detected each time the detrack value is changed stepwise within a predetermined range of values including the detrack value reference value 0 and centering on the detrack value reference value 0, Since an optimum detrack value is set based on the difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) in each detected jitter value. The optimal detrack value is set for the optical disc apparatus 1. Since an optimal detrack value is set for the optical disc apparatus 1, the OPU 2 performs a stable tracking servo operation on the optical disc M. In addition, the detrack value setting operation in the optical disc apparatus 1 can be easily performed.

Further, after the optical disk (M) is completely installed in the optical disk apparatus 1, each signal is read from the optical disk (M) to detect each jitter value, and detrack adjustment of the OBL 4 is performed on the optical disk (M). The detrack adjustment is performed within a time period exceeding 0 second and approximately 20 seconds. More specifically, after the optical disk (M) is completely installed in the optical disk apparatus 1, the detrack value reference value 0 (FIGS. 15, 16, and 17) is included. The detrack value is changed stepwise within a predetermined range of values centered on (FIG. 13A: S240, FIG. 13B: S241 to S246), and each signal is read from the optical disc (M) (FIG. 1). Each jitter value is detected, and a difference value jitter (( _b )) between the maximum jitter value jitter (i _b max) (FIGS. 15, 16, and 17) and the minimum jitter value jitter (i _b min) in each detected jitter value. i _b d) on the basis of (Fig. 13A: S260), the optical disc (M) (Fig. 1 when to perform optimal detrack value adjustment of OBL4 respect), 0 seconds in the time of 15 seconds or less substantially exceed Detonator It is preferred to terminate the click adjustment.

As described above, since the time required for the detrack value adjustment method of the optical disc apparatus 1 is set to a short time, the detrack adjustment is performed in the optical disc apparatus 1 without waiting for a long time for the detrack adjustment. The setting process when it is performed is finished immediately. After the optical disk (M) is completely installed in the optical disk apparatus 1, the detrack value is within a predetermined range of values including the detrack value reference value 0 and the detrack value reference value 0 as the center. The jitter value is detected by reading each signal from the optical disc (M) in a stepwise manner, and the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) in each detected jitter value. When the detrack adjustment of the OBL 4 with respect to the optical disc (M) is performed based on the difference value jitter (i _b d), the time is over 0 seconds and within about 20 seconds, preferably over 0 seconds. Since the detrack adjustment is performed within 15 seconds, the main data / information / signal of the optical disk (M) is read after the optical disk (M) is installed in the optical disk apparatus 1. By begin to, that the optical disc apparatus 1 is severely wait a long time for the de-track adjustment for automatic execution is avoided.

FIG. 15 shows jitter when it is determined in CPU 10 (FIG. 1) that [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] (FIG. 13A, S260: YES). It is a characteristic view which shows the relationship between a value and a detrack value.

When the OBL4 detrack adjustment is performed on the optical disc (M) (FIG. 1), as shown in FIG. 15, the difference value jitter between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is used. When (i _b d) is larger than a predetermined value jitter (i _b s), a detrack value corresponding to the minimum jitter value jitter (i _b min) is set to an optimum detrack value. Let it be set as

The minimum jitter value jitter (i _b min) is smaller than the jitter value jitter (i _b f) which is smaller than the maximum jitter value jitter (i _b max), for example, by a determination value jitter (i _b s). In such a case, the tracking servo circuit 32 sets a detrack value corresponding to the minimum jitter value jitter (i _b min), that is, a detrack value that is + 6% larger than the reference value 0 as an optimum detrack value. The operation is performed in the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _b max) −jitter (i _b min)”. When the value of “jitter (i _b max) −jitter (i _b min)” exceeds a certain value jitter (i _b s), for example, “2% × i _b min” is set in “DETRACK”. Thus, the detrack adjustment is completed.

  When the detrack value setting operation is performed in this way, a detrack value larger by + 6% than the reference detrack value 0 is set in the tracking servo circuit 32, and the tracking servo circuit 32 is centered on the set detrack value. Tracking servo operation is performed.

By performing the detrack value adjustment method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tracking servo operation on the optical disc (M). A difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is set to a value larger than a predetermined value jitter (i _b s). The optical disc (M) is an optical disc (M) having poor jitter characteristics. When a signal is read from the optical disc (M) having poor jitter characteristics, the detrack value corresponding to the minimum jitter value jitter (i _b min) is set as the optimum detrack value. Executed.

If it is determined in step S260 shown in FIG. 13A that [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] is not satisfied (S260: NO), the reference detrack value 0 is set. The optimum detrack value is set (S280).

FIG. 16 shows a case where it is determined in CPU 10 (FIG. 1) that [jitter (i _b max) −jitter (i _b min)> jitter (i _b s)] is not satisfied (FIG. 13A, S260: NO). It is a characteristic view which shows the relationship between the jitter value of this, and a detrack value.

When the OBL4 detrack adjustment is performed on the optical disc (M) (FIG. 1), the difference value jitter between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) as shown in FIG. When (i _b d) is set to a small value equal to or smaller than a predetermined value jitter (i _b s), the detrack reference value 0 is set as the optimum detrack value. When the maximum value-minimum value (MAX-MIN) in each jitter value is equal to or less than a certain value, the detrack value is set to ± 0. For example the jitter value of the waveform shown in FIG. 16 is detected, the jitter value jitter _(i b o) at the reference value 0 of the detrack value is a value larger than the predetermined jitter value jitter _(i b f), and, A difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is set to a small value equal to or smaller than a predetermined value jitter (i _b s). In this case, the detrack value is set to ± 0. Alternatively, for example, the jitter value of the waveform shown in FIG. 16 is detected, and each jitter value is set to a value larger than a predetermined jitter value jitter (i _b f), and the maximum jitter value jitter (i _b max) is set. When the difference value jitter (i _b d) from the minimum jitter value jitter (i _b min) is a small value not more than a predetermined value jitter (i _b s), the detrack value is ± 0. To set.

The minimum jitter value jitter (i _b min) is larger than the jitter value jitter (i _b f) which is smaller than the maximum jitter value jitter (i _b max), for example, by a determination value jitter (i _b s). In such a case, since the change in the jitter value is small, the operation for setting the reference detrack value as the optimum detrack value in the tracking servo circuit 32 is performed in the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _b max) −jitter (i _b min)”. When the value of “jitter (i _b max) −jitter (i _b min)” is equal to or smaller than a predetermined value jitter (i _b s), “DETRACK” is set to 0. Thus, the detrack adjustment is completed.

  When the detrack value setting operation is performed in this way, the tracking servo operation by the tracking servo circuit 32 is performed around the reference detrack value 0. Since the tracking servo operation centered on the reference detrack value 0 is performed, the tracking control in the OPU 2 can be stably performed.

By performing the detrack value adjusting method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tracking servo operation on the optical disc M. A difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is set to a small value equal to or smaller than a predetermined value jitter (i _b s). The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disc M having relatively good jitter characteristics, the detrack value reference value 0 is set to the optical disc apparatus 1 as an optimum detrack value, so that the tracking servo operation of the OPU 2 does not cause a problem and is stable. The tracking servo operation performed is executed in OPU2. In addition, it is possible to easily set the detrack value in the optical disc apparatus 1.

When the OBL4 detrack adjustment is performed on the optical disc (M) (FIG. 1), as shown in FIG. 17, the difference value jitter between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is used. When (i _b d) is set to a small value equal to or smaller than a predetermined value jitter (i _b s), the detrack reference value 0 is set as the optimum detrack value. When the maximum value-minimum value (MAX-MIN) in each jitter value is equal to or less than a certain value, the detrack value is set to ± 0. For example the jitter value of the waveform shown in FIG. 17 is detected, the jitter value jitter _(i b o) at the reference value 0 of the detrack value is a value larger than the predetermined jitter value jitter _(i b f), and, A difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is set to a small value equal to or smaller than a predetermined value jitter (i _b s). In this case, the detrack value is set to ± 0. In such a case, since the change in the jitter value is small, the operation of setting the reference detrack value as the optimum detrack value in the tracking servo circuit 32 is as follows.
This is performed by the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter (i _b max) −jitter (i _b min)”. When the value of “jitter (i _b max) −jitter (i _b min)” is equal to or smaller than a predetermined value jitter (i _b s), “DETRACK” is set to 0. Thus, the detrack adjustment is completed.

  When the detrack value setting operation is performed in this way, the tracking servo operation by the tracking servo circuit 32 is performed around the reference detrack value 0. Since the tracking servo operation centered on the reference detrack value 0 is performed, the tracking control in the OPU 2 can be stably performed.

By performing the detrack value adjusting method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tracking servo operation on the optical disc M. A difference value jitter (i _b d) between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) is set to a small value equal to or smaller than a predetermined value jitter (i _b s). The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disc M having relatively good jitter characteristics, the detrack value reference value 0 is set to the optical disc apparatus 1 as an optimum detrack value, so that the tracking servo operation of the OPU 2 does not cause a problem and is stable. The tracking servo operation performed is executed in OPU2. In addition, it is possible to easily set the detrack value in the optical disc apparatus 1.

When the optical disc (M) is completely installed in the optical disc apparatus 1 and each signal is read from the optical disc (M) to detect each jitter value, and the OBL 4 is detracked for the optical disc (M). In addition, the detrack adjustment is performed within a time period exceeding 0 second and within approximately 15 seconds. More specifically, after the optical disk (M) is completely installed in the optical disk apparatus 1, the detrack value reference value 0 (FIGS. 15, 16, and 17) is included. The detrack value is changed step by step within a numerical value in a predetermined range centered on (FIG. 13A: S240, FIG. 13B: S241 to S246), and each signal is read from the optical disc (M) (FIG. 1). Each jitter value is detected, and a difference value jitter (( _b )) between the maximum jitter value jitter (i _b max) (FIGS. 15, 16, and 17) and the minimum jitter value jitter (i _b min) in each detected jitter value. i _b d) on the basis of (Fig. 13A: S260), the optical disc (M) (Fig. 1 when to perform optimal detrack value adjustment of OBL4 respect), 0 seconds in the time of 10 seconds shown exceed Detonator It is preferred to terminate the click adjustment.

As described above, since the time required for the detrack value adjustment method of the optical disc apparatus 1 is set to a short time, the detrack adjustment is performed in the optical disc apparatus 1 without waiting for a long time for the detrack adjustment. The setting process when it is performed is finished immediately. After the optical disk (M) is completely installed in the optical disk device 1, the detrack value is within a predetermined range of values including the detrack value reference value 0 and the detrack value reference value 0 as the center. The jitter value is detected by reading each signal from the optical disk (M) in a stepwise manner, and the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) in each detected jitter value. When the detrack adjustment of the OBL 4 with respect to the optical disc (M) is performed based on the difference value jitter (i _b d), the time is over 0 seconds and within about 15 seconds, preferably over 0 seconds. Since the detrack adjustment is performed within 10 seconds, the main data / information / signal of the optical disc (M) is read after the optical disc (M) is installed in the optical disc apparatus 1. By begin to, that the optical disc apparatus 1 is severely wait a long time for the de-track adjustment for automatic execution is avoided.

As described above, when the optical disc (M) (FIG. 1) is detracked by OBL4 and the optical disc apparatus 1 is set with an optimum detrack value, first, the detrack value reference value 0 (FIG. 1) is set. 15, 16, to detect the jitter value on the basis of FIG. 17), the jitter value jitter based on the reference value 0 of the detected detrack value _(i b o) is given a predetermined jitter value jitter (i _{b When the} value is larger than f), detracking is performed within a predetermined range (eg, -8% to +8% /-10% to + 10%) including the detrack reference value 0 next. Each jitter value detection step of detecting each jitter value every time the value is changed stepwise is executed.

Thus, the optimum detrack value is set in the optical disc apparatus 1 by performing the detrack value adjusting method of the optical disc apparatus 1 (FIG. 1). Optical disc (M) to carry out the de-track adjustment OBL4, optimal de-track value when to set the optical disc apparatus 1, firstly jitter value based on the reference value 0 of the detrack value jitter (i _b o ) Is detected (FIG. 13A: S220). As shown in FIGS. 15, 16 and 17, the jitter value jitter (i _b o) based on the detrack reference value 0 is set to a value larger than a predetermined jitter value jitter (i _b f). The optical disc (M) (FIG. 1) is an optical disc (M) that needs to detect / inspect each jitter value corresponding to each detrack value. As shown in FIG. 13A, when the jitter value jitter (i _b o) based on the reference value 0 of the detected detrack value is larger than a predetermined jitter value jitter (i _b f). (S230: YES), the detrack value is then changed stepwise within a predetermined range (eg, -8% to +8% /-10% to + 10%) including the detrack reference value 0. Each jitter value is detected every time (FIG. 13A: S240, FIG. 13B: S241 to S246), and the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) in each detected jitter value are detected. Each jitter value detection / comparison determination / optimum value setting step for setting an optimum detrack value is executed based on the difference value jitter (i _b d) (FIG. 13A: S240, FIG. 13B: S). 241 to S246, FIG. 13A: S250, S260, S270 / S280).

  Further, the detrack value is set within a predetermined range (eg, −10% to +10% / − 8% to + 8%) including the detrack value reference value 0 (FIGS. 15, 16, and 17). The increment of the detrack value when changing in stages is set to a value in the range of 0.5% to 5% of the entire detrack value, specifically to a value in the range of 1% to 4%. Is done. For example, if the increment of the detrack value is set to a fine increment of less than 0.5% of the entire detrack value, a large amount of data is acquired, so there is a concern that the time required for the detrack adjustment may be increased. The In addition, when the detrack value increment is, for example, a coarse increment exceeding 5% of the entire detrack value, there is a concern that accurate detrack adjustment may not be performed because the number of acquired data is insufficient. . The detrack adjustment is performed by setting the detrack value increment to a value within the range of 1% to 4% of the entire detrack value, preferably 2% of the detrack value increment. Therefore, the detrack adjustment is performed with relatively high accuracy, and the time required for the adjustment is not significantly increased.

As shown in FIGS. 18 and 19, the jitter value is changed every time the detrack value is changed stepwise within a predetermined range including the detrack value reference value 0 and the detrack value reference value 0 as the center. before causing the operation to be detected, by detecting a jitter value based on the reference value 0 of the detrack value, a jitter value jitter based on the reference value 0 of the detected detrack value (i b _o) is predetermined When the value is smaller than the predetermined jitter value jitter (i _b f), the reference value 0 of the detrack value is set as the optimum detrack value.

More specifically, when the detrack adjustment of the OBL 4 is performed on the optical disc M (FIG. 1) and the optical disc apparatus 1 is set with an optimum detrack value, first, the detrack value reference value 0 (FIG. 18) is set. is detected jitter value based on the jitter value jitter based on the reference value 0 of the detected detrack value _(i b o) is, the smaller value of the predetermined predetermined jitter value jitter _(i b f) below Each time the detrack value is changed stepwise within a predetermined range of values including the detrack value reference value 0, each jitter value detection step is omitted without detecting each jitter value. detection process of the jitter value jitter based on the reference value 0 of the track value _(i b o), and, the reference value 0 of the predetermined jitter value jitter _(i b f) a de-track value set in advance Immediately after the jitter value jitter (i b _o) and the comparative determination process brute to, to set the reference value 0 of the detrack value as the optimum detrack value.

When the detrack value is ± 0, when the jitter value jitter (i _b o) is set to a smaller value than a predetermined jitter value jitter (i _b f), the optimum detrack value is ± Set to 0. When an optical disc M having good jitter characteristics is used, priority is given to stability of tracking servo.

By performing the detrack value adjusting method of the optical disc apparatus 1 (FIG. 1) in this way, when the optical disc M having good jitter characteristics is used, the detrack value is set quickly and the optical disc apparatus 1 is used. The OPU 2 that constitutes a stable tracking servo operation with respect to the optical disc M. On the optical disc M to perform the de-track adjustment OBL4, when to set the optimum detrack value in the optical disc apparatus 1, firstly jitter value based on the reference value 0 of the detrack value jitter of (i b _o) It is made to detect (FIG. 13A: S220). As shown in FIG. 18, the optical disc M in which the jitter value jitter (i _b o) based on the detrack reference value 0 is smaller than a predetermined jitter value jitter (i _b f) (see FIG. 1). ) Is an optical disc M with good jitter characteristics.

When a signal is read from the optical disc M having good jitter characteristics, each jitter value is not detected each time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value 0. value detection / comparison judgment step (Fig. 13A: S240, FIG. 13B: S241~S246, FIG. 13A: S250, S260) is omitted, detection of the jitter value jitter based on the reference value 0 of detrack value _(i b o) step (Figure 13A: S220), and, predefined predetermined jitter value jitter _(i b f) jitter value based on the reference value 0 of detrack value jitter _(i b o) and the comparative determination process (FIG. 13A : Immediately after S230), the optical disc apparatus 1 is set with the reference value 0 of the detrack value as the optimum detrack value (FIG. 13A: S280). Setting time of de-track value in the optical disc apparatus 1 is reduced. Further, when a signal is read from the optical disc M having good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the detrack value as the optimum detrack value, so that the tracking servo operation of the OPU 2 does not cause a problem and is stable. The tracking servo operation performed is executed in OPU2.

When the OBL 4 detrack adjustment is performed on the optical disc M (FIG. 1) and the optical disc apparatus 1 is set with an optimum detrack value, first, based on the detrack value reference value 0 (FIG. 19). The jitter value is detected, and the jitter value jitter (i _b o) based on the reference value 0 of the detected detrack value is set to a smaller value than a predetermined jitter value jitter (i _b f). Sometimes, each time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value 0, each jitter value detection step is omitted without detecting each jitter value. detection process, and jitter predetermined jitter value jitter predetermined for the _(i b f) based on the reference value 0 of the detrack value of the jitter value jitter based on the reference value 0 of the _(i b o) jitter (i b _o) and comparing the determination step immediately following the, to set the reference value 0 of the detrack value as the optimum detrack value.

When the detrack value is ± 0, when the jitter value jitter (i _b o) is set to a smaller value than a predetermined jitter value jitter (i _b f), the optimum detrack value is ± Set to 0. When an optical disc M having good jitter characteristics is used, priority is given to stability of tracking servo.

By performing the detrack value adjusting method of the optical disc apparatus 1 (FIG. 1) in this way, when the optical disc M having good jitter characteristics is used, the detrack value is set quickly and the optical disc apparatus 1 is used. The OPU 2 that constitutes a stable tracking servo operation with respect to the optical disc M. On the optical disc M to perform the de-track adjustment OBL4, when to set the optimum detrack value in the optical disc apparatus 1, firstly jitter value based on the reference value 0 of the detrack value jitter of (i b _o) It is made to detect (FIG. 13A: S220). As shown in FIG. 19, the optical disc M in which the jitter value jitter (i _b o) based on the detrack reference value 0 is smaller than a predetermined jitter value jitter (i _b f) (see FIG. 1). ) Is an optical disc M with good jitter characteristics. Further, for example, as shown in FIG. 19, all the jitter values between the maximum jitter value jitter (i _b max) and the minimum jitter value jitter (i _b min) are all determined as predetermined jitter values jitter (i _b f) The optical disk M (FIG. 1) having a small value equal to or smaller than the value is an optical disk M having good jitter characteristics.

When a signal is read from the optical disc M having good jitter characteristics, each jitter value is not detected each time the detrack value is changed stepwise within a predetermined range of values including the detrack reference value 0. value detection / comparison judgment step (Fig. 13A: S240, FIG. 13B: S241~S246, FIG. 13A: S250, S260) is omitted, detection of the jitter value jitter based on the reference value 0 of detrack value _(i b o) step (Figure 13A: S220), and, predefined predetermined jitter value jitter _(i b f) jitter value based on the reference value 0 of detrack value jitter _(i b o) and the comparative determination process (FIG. 13A : Immediately after S230), the optical disc apparatus 1 is set with the reference value 0 of the detrack value as the optimum detrack value (FIG. 13A: S280). Setting time of de-track value in the optical disc apparatus 1 is reduced. Further, when a signal is read from the optical disc M having good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the detrack value as the optimum detrack value, so that the tracking servo operation of the OPU 2 does not cause a problem and is stable. The tracking servo operation performed is executed in OPU2.

  Since the detrack value ± 0 is first measured and set, the measurement time for detecting the jitter value can be shortened. The detrack adjustment can be executed by the optical disc apparatus 1 including the OPU 2 only for the optical disc (M) that is estimated / determined that the jitter value is not good and needs to detect / inspect each jitter value. Since the detrack adjustment is performed only for the optical disc (M) that is estimated / determined that the jitter value is not good and each jitter value needs to be detected / inspected, the initial measurement time of the optical disc M with good jitter characteristics in the OPU 2 Can be shortened. Further, since the detrack value is set to ± 0 for the optical disc M having good jitter, stable tracking servo can be executed for the optical disc M having good jitter. When the optical disk device 1 is equipped with an optical disk M in which the jitter value does not substantially change, the detrack value for the tracking servo circuit 32 is set to ± 0, so that track skipping does not occur and stable tracking servo can be executed. Become.

As described above, the detrack value adjustment method of the optical disc apparatus 1 detects the jitter value every time the detrack value is changed by the predetermined percentage within the predetermined range centered on the reference value 0 of the detrack value. Thus, the optimum detrack value setting operation is performed. Before performing such an operation, a jitter value detection operation is performed in a state where the reference detrack value is set to 0 and the detrack value is set. When the detected jitter value jitter (i _b o) is set to a small value equal to or smaller than the predetermined value jitter (i _b f), that is, when it is determined that the reproduction characteristics of the optical disc M are good, the reference data is directly used. The operation for setting the track value 0 as the optimum detrack value is performed in the optical disc apparatus 1.

When the jitter value jitter (i _b o) detected / set for performing the determination operation is detected as a small jitter value equal to or less than a predetermined jitter value jitter (i _b f), for example, the optical disk M is changed to a benign disk. Therefore, the reproduction operation can be performed without any trouble without performing the detrack value selection operation.

  After the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1, when the OBL 4 detrack adjustment is performed on the optical disc M having good jitter characteristics within the optical disc apparatus 1, the time exceeds 0 second and is approximately 3 The detrack adjustment is performed within a time within seconds, preferably within a time exceeding 0 seconds and within approximately 1 second.

  When the OBL 4 detrack adjustment is performed on the optical disc M after the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1, it is within 0 seconds and within about 3 seconds, preferably 0 seconds. Since the detrack adjustment is performed within approximately 1 second, the optical disk apparatus 1 starts to read the main data / information / signal of the optical disk M after the optical disk M is installed in the optical disk apparatus 1. There is no need to wait for a long time for the detrack adjustment performed automatically by 1. The detrack adjustment in the optical disc device 1 when the optical disc M having good jitter characteristics is installed in the optical disc device 1 is completed quickly and in a short time.

  Next, a state when a track jump of the OPU 2 is performed when a detrack value other than the reference value 0 is set will be described.

  First, detrack adjustment of the optical disc apparatus 1 (FIG. 1) is performed. At this time, the detrack value is set to a numerical value other than the reference value 0. The reference value 0 is set to the detrack value before the start of the track jump. Perform a track jump operation. After the track jump, the detrack value is set to a value other than the original reference value 0.

  The operation of the optical disc apparatus 1 from the start to the end of the track jump process will be described in detail. Among the detrack values within a predetermined range, the optimum detrack value is deviated to any value other than the reference value 0. When set to a numerical value (FIG. 13A: S270, FIG. 14, S291: NO, FIG. 15), when the OPU 2 performs a track jump on the optical disc (M) (FIG. 1), the detrack value is temporarily set. Therefore, the reference value is set to 0. After the detrack value is temporarily set to the reference value 0 (FIG. 14: S292), the OPU 2 (FIG. 1) is caused to execute a track jump (FIG. 14: S293).

  When the detrack value is set in the optical disk apparatus (FIG. 1) as in steps S291 and S292 in FIG. 14, any detrack value other than the detrack reference value 0 is selected from the detrack values within the predetermined range. Even when a biased numerical value (for example, + 6%) is set as the optimum detrack value, the track jump of the OPU 2 with respect to the optical disc (M) is performed well. When the detrack adjustment of the OPU 2 for the optical disc (M) is performed and the detrack value is set to a deviated value (+ 6%) other than the reference value 0, the track jump of the OPU 2 to the optical disc (M) is performed. In some cases, the track of the optical disk (M) cannot be captured. However, even when the detrack value is set to a deviated numerical value other than the reference value 0, when the OPU 2 performs a track jump, by temporarily setting the detrack value to the reference value 0, The track jump of the OPU 2 with respect to the optical disc (M) is likely to be performed normally.

  After the track jump of the OPU 2 with respect to the optical disc (M) (FIG. 1) is executed (FIG. 14: S293) and the track jump operation is completed, the detrack value is again an original biased value other than the reference value 0 (example: + 6%) (FIG. 14: S295, FIG. 15). As the initial optimum detrack value is set to a deviated value other than the reference value 0 (FIG. 14, S294: NO, FIG. 15), the detrack value is set to a value other than the reference value 0 again after the track jump is completed. It returns to the original biased numerical value (example: + 6%) (FIG. 14: S295).

  As a result, the optimum detrack value for the optical disc apparatus 1 is set again. When the track jump of the OPU 2 is not performed on the optical disc (M), the deviated numerical value other than the reference value 0 of the detrack value is set again as the optimum detrack value in the optical disc apparatus 1, so that the optical disc (M) is set. The tracking adjustment of OBL2 of OPU2 is performed well. In addition, since the detrack value other than the reference value 0 previously stored in the second memory circuit 12 is set again as the optimum detrack value in the optical disc apparatus 1, the optimum detrack value can be quickly reset. Is called.

  Next, the state when the track jump of the OPU 2 is performed when the optimum detrack value is set to the reference value 0 will be described. When the optimal detrack value is set to the reference value 0, the operation of the optical disc apparatus 1 from the start to the end of the track jump process will be described in detail. The optimal detrack value is set to the reference value 0. If it is performed (FIG. 14, S291: YES, FIG. 16, FIG. 17, FIG. 18, FIG. 19), the OPU2 (FIG. 1) is caused to execute a track jump without changing the detrack value (FIG. 14: S293). ). Since the optimum detrack value continues to be set at the reference value 0, the track jump of the OPU 2 with respect to the optical disc M / (M) (FIG. 1) is performed normally. With the initial optimum detrack value set to the reference value 0 (FIG. 14, S294: YES, FIGS. 16, 17, 18, and 19), the detrack value is changed after the track jump ends. The optimum detrack value is maintained at the reference value 0 without any change.

  Next, a tilt value adjusting method of the disk device 1 will be described.

  20A is a flowchart showing an embodiment of a tilt value adjusting method of the disk device, FIG. 20B is a flowchart showing each jitter value detecting step of the tilt value adjusting method of the disk device, and FIG. 21 is a tilt value adjusting of the disk device. FIG. 22 is a graph showing the relationship between the tilt value and the jitter value, FIG. 23 is a graph showing the relationship between the tilt value and the jitter value, and FIG. 24 is a flowchart showing the track jump process when the method is performed. 25 is a graph showing the relationship between the tilt value and the jitter value, FIG. 25 is a graph showing the relationship between the tilt value and the jitter value, and FIG. 26 is a graph showing the relationship between the tilt value and the jitter value.

  In conjunction with the flowcharts shown in FIGS. 20A, 20B, and 21, the tilt value adjusting method of the optical disc apparatus 1 will be described with reference to the drawings.

  The tilt adjustment method of the optical disc apparatus 1 based on the jitter value is performed as follows. For example, at the time of reproduction of the reproduction / recording optical disc M (FIG. 1), servo adjustment for data reading or the like has already been completed. In this case, for example, focus offset adjustment has already been performed. Also, for example, track offset adjustment has already been performed. For example, a signal having an approximately horizontal S-shaped curve with a tilt value of −50% to + 50% centered on the reference value 0 is read in the optical disc apparatus 1. When the tilt adjustment method of the optical disc apparatus 1 is performed, for example, the tilt adjustment method of the optical disc apparatus 1 including mechanical tilt adjustment is performed.

The optical disk device 1 is used to adjust the tilt of the OBL 4 with respect to the signal surface portion Ms of the optical disk M. Using the optical disc apparatus 1, the tilt value adjusting method in the optical disc apparatus 1 is performed.

For example, when the optical disc apparatus 1 is turned on, preparations for executing the tilt value adjusting method of the optical disc apparatus 1 are started. When the optical disk device 1 is turned on and the optical disk device 1 is turned on, data such as various information is sent from the memory circuit 11 such as the ROM 11 to the system control circuit 10. At this time, for example, various data such as a predetermined jitter value jitter (i _c f) and determination value jitter (i _c s) are sent to the system control circuit 10 and set in the system control circuit 10 (FIG. 20A: S310).

  The tilt value adjusting method of the optical disc apparatus 1 (FIG. 1) is to detect the jitter value of the signal read from the optical disc M using the optical disc apparatus 1 having the OPU 2 having the OBL 4 and to detect the detected jitter value. When the OBL 4 of the OPU 2 is focused on the signal surface portion Ms of the optical disk M, the tilt value used for correcting the angular deviation of the OBL 4 with respect to the signal surface portion Ms of the optical disk M is adjusted to It is a tilt value adjustment method of the optical disc apparatus 1 that performs tilt adjustment of the OBL 4. The following tilt value setting process is performed.

When the optical disc apparatus 1 is equipped with the optical disc M, an operation for causing the optical disc apparatus 1 to set an appropriate tilt value is substantially started. First, using the optical disk device 1, a tilt voltage is applied to a tilt coil (TILTCOIL) 73, and jitter is measured. When the optical disk apparatus 1 is caused to perform a tilt value adjustment method, first, jitter is detected / measured at a tilt value ± 0 (FIG. 20A: S320). At this time, as shown in FIG. 25 or FIG. 26, for example, the jitter value jitter (i _c o) at the tilt value ± 0 is set to a small value equal to or smaller than the specified value jitter (i _c f), and the optical disc M having good jitter characteristics. When it is determined by the program in the CPU 10 (FIG. 1A) (FIG. 20A, S330: NO), the tilt value is set to 0 (FIG. 20A: S380), and the tilt adjustment ends.

  This optical disc apparatus 1 performs different tilt value adjustment methods depending on the optical disc M having good jitter characteristics and the optical disc (M) not having good jitter characteristics.

When performing the tilt value adjustment method in the optical disc apparatus 1 using the optical disc apparatus 1, the jitter values are detected / measured as necessary, for example, as shown in FIGS. More specifically, the jitter value jitter (i _c o) at the tilt value ± 0 is assumed to be larger than the specified value jitter (i _c f), and it is estimated that the jitter characteristic is not good by the program in the CPU 10 (FIG. 1). The following measurement is performed for the optical disc (M) that has been determined to be required to detect / inspect each jitter value. First, when a signal is read from the optical disk (M) to detect a jitter value, the tilt value within a predetermined range is changed. More specifically, when a jitter value is detected by reading a signal from the optical disc (M), the tilt value reference value 0 (FIGS. 22, 23, and 24) is included, and the tilt value reference value 0 is the center. Within the predetermined range of values, the tilt value is changed stepwise (FIG. 20A: S340, FIG. 20B: S341 to S346). Each time the tilt value is changed in stages, the jitter value is detected.

  The operation for setting the tilt value is performed by the tilt value setting circuit 23 in a state where the reproduction operation of the signal recorded on the optical disc (M) (FIG. 1) is performed. In the tilt value setting circuit 23, the value of the tilt value set with respect to the reference value 0 (FIGS. 22, 23, and 24) is changed in steps of 2% from −8% to + 8%. At the same time, the jitter value of the reproduction signal is detected by the jitter measuring circuit 9 corresponding to each tilt value, whereby the tilt value is set.

  More specifically, the signal recorded on the optical disc (M) is reproduced with the tilt value set by the tilt value setting circuit 23 with the tilt value set to a value that is approximately -8% lower than the reference value 0. Is detected by the jitter measuring circuit 9. The jitter value thus detected is stored in the memory circuit 12 such as the RAM 12 together with the tilt value.

  The tilt value is changed in steps of 2% from −8% to + 8% with respect to the reference value 0, and the jitter value corresponding to each tilt value is detected, and the jitter value is stored in the memory circuit 12 together with the tilt value. The operation is repeated.

  For an optical disc (M) in which an operation for setting a tilt value is started in the optical disc apparatus 1 and it is determined that each jitter value needs to be detected / inspected during the tilt adjustment method of the optical disc apparatus 1, first. Every time the tilt value is changed within a predetermined range, the jitter value is detected (FIG. 20A: S340, FIG. 20B: S341 to S346). The predetermined range is, for example, a tilt value between −10% and + 10% set in the tilt value setting circuit 23 with respect to the reference value when the tilt value 0 is determined as the reference value (FIG. 22). , FIG. 23, FIG. 24). For example, when the tilt value 0 is set as a reference value, a preferable range of the tilt value is a range between −8% and + 8% set in the tilt value setting circuit 23 with respect to the reference value.

  For example, if the tilt value is set smaller than −10%, the normal tilt function may not work. For example, when the tilt value is set larger than + 10%, the normal tilt function may not work. For this reason, a tilt value between −10% and + 10% around the reference value 0 of the tilt value is preferably set in the tilt value setting circuit 23. Preferably, a tilt value between −8% and + 8% around the reference value 0 of the tilt value is set in the tilt value setting circuit 23 so that a normal tilt function works.

For example, it is estimated that the jitter value jitter (i _c o) in the reference value 0 (FIGS. 22, 23, and 24) of the tilt value is larger than the specified value jitter (i _c f) and the jitter value is not good. For the optical disc (M) (FIG. 1) that is determined and needs to be detected / inspected for each jitter value, the following steps are performed based on the control of the program in the CPU 10. The following steps are performed by the CPU 10 and the second memory circuit 12.

First, an initial value is set by a program in the CPU 10 and i _c = −4 is set (FIG. 20B: S341). Further, for example, the value of “TILT = 2% × i _c ” is set (SET) (S342). The jitter value is measured by the OPU 2 (S343), and the result is stored in the second memory circuit 12 as “jitter (i _c )” (S344).

“I _c ” is incremented by a program in the CPU 10 (S341, S342 to S346).

When “i _c <5” is set (S346: NO), the value of “TILT = 2% × i _c ” is set (S342), and the jitter is again measured by the OPU 2 (S343). The second memory circuit 12 stores the data as “jitter (i _c )” (S344). When “i _c ≧ 5” is satisfied (S346: YES), the minimum value is obtained from “jitter (i _c )”, and “i _c ” at that time is set to “i _c min” (FIG. 20A: S350). . When “i _c ≧ 5” (FIG. 20B, S346: YES), the maximum value is obtained from “jitter (i _c )”, and “i _c ” at that time is set to “i _c max” ( FIG. 20A: S350).

Next, based on the difference value jitter ( _ic d) between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min) in each detected jitter value (S360), an optimum tilt is obtained. Let the value be set.

When each jitter value is detected by changing the tilt value within a predetermined range (FIG. 20A: S340, FIG. 20B: S341 to S346), the maximum jitter value jitter is detected from the detected jitter values. (I _c max) and the minimum jitter value jitter (i _c min) are selected (FIG. 20A: S350).

When the selection setting operation in step S350 is performed, [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] is set (S360: YES) or [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] is not determined (S360: NO), and a determination operation is performed. If it is determined in the step of S360 that [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] (S360: YES), the minimum jitter value jitter (i _c min) is set. The corresponding tilt value is set as the optimum tilt value (S370). Alternatively, when it is determined in step S360 that [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] is not satisfied (S360: NO), the reference value 0 of the tilt value is optimized. The tilt value is set (S380).

By performing the tilt value adjustment method of the optical disc apparatus 1 in this way, an optimum tilt value is set for the optical disc apparatus 1. If necessary, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value 0 of the tilt value and centering on the reference value 0 of the tilt value. Since the optimum tilt value is set based on the difference value jitter ( _ic d) between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min) in each jitter value, the optical disc apparatus 1 Is set to the optimum tilt value. Since an optimum tilt value is set for the optical disc apparatus 1, the OPU 2 performs a stable tilt operation on the optical disc M. Also, the tilt value setting operation in the optical disc apparatus 1 can be easily performed.

Further, after the optical disc (M) is completely installed in the optical disc apparatus 1, each signal is read from the optical disc (M) to detect each jitter value, and the tilt adjustment of the OBL 4 with respect to the optical disc (M) is performed. Sometimes, the tilt adjustment is performed within a time exceeding 0 second and within approximately 20 seconds. More specifically, after the optical disc (M) is completely installed in the optical disc apparatus 1, the tilt value reference value 0 (FIGS. 22, 23, and 24) is included, and the tilt value reference value 0 is the center. Within a predetermined range of numerical values, the tilt value is changed stepwise (FIG. 20A: S340, FIG. 20B: S341-S346), each signal is read from the optical disc (M) (FIG. 1), and each jitter value is read. is detected, and the maximum jitter value jitter in each jitter value detected _(i c max) (22, 23, 24) the difference between the value jitter _(i c d the minimum jitter value jitter _(i c min) ) (FIG. 20A: S360), when the optimum tilt value adjustment of OBL4 with respect to the optical disc (M) (FIG. 1) is performed, the tilt adjustment is completed within a time period exceeding 0 seconds and within approximately 15 seconds. It is preferable.

As described above, since the time required for the tilt value adjusting method of the optical disc apparatus 1 is set to a short time, the tilt adjustment is performed in the optical disc apparatus 1 without waiting for a long time for the tilt adjustment. The setting process is immediately completed. After the optical disc (M) is completely installed in the optical disc apparatus 1, the tilt value is stepwise within a predetermined range of values including the reference value 0 of the tilt value and centering on the reference value 0 of the tilt value. The jitter value is detected by reading each signal from the optical disc (M), and the difference between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min) in each detected jitter value. based on the value jitter _(i c d), the optical disk when the tilt adjustment of OBL4 for (M) is carried out, within a time of 20 seconds approximately greater than 0 seconds, preferably within 15 seconds substantially greater than 0 seconds Since the tilt adjustment is performed within the time, the optical data is read after the optical disk (M) is installed in the optical disk apparatus 1 until the main data / information / signal of the optical disk (M) is read. Disk device 1 is avoided that severely wait a long time for the tilt adjustment to be automatically executed.

FIG. 22 shows jitter in the case where [jitter ( _ic max) −jitter ( _ic min)> jitter ( _ic s)] is determined in the CPU 10 (FIG. 1) (FIG. 20A, S360: YES). It is a characteristic view which shows the relationship between a value and a tilt value.

When tilt adjustment of the OBL 4 with respect to the optical disc (M) (FIG. 1) is performed, as shown in FIG. 22, the difference value jitter (( _c min)) between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min). When i _c d) is larger than a predetermined value jitter (i _c s), a tilt value corresponding to the minimum jitter value jitter (i _c min) is set as an optimum tilt value. .

The minimum jitter value jitter (i _c min) is smaller than the jitter value jitter (i _c f), for example, which is smaller than the maximum jitter value jitter (i _c max), for example, by a determination value jitter (i _c s). In such a case, the tilt value setting circuit 23 sets the tilt value corresponding to the minimum jitter value jitter (i _c min), that is, the tilt value larger by + 6% than the reference value 0 as the optimum tilt value. This is performed by the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter ( _ic max) −jitter ( _ic min)”. When the value of “jitter (i _c max) −jitter (i _c min)” exceeds a certain value jitter (i _c s), for example, “2% × i _c min” is set in “TILT”. This completes the tilt adjustment.

  When the tilt value setting operation is performed in this way, a tilt value larger by + 6% than the reference tilt value 0 is set in the tilt value setting circuit 23, and the tilt value is set by the tilt value setting circuit 23 around the set tilt value. Operation is performed.

By performing the tilt value adjusting method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tilt operation on the optical disc (M). A difference value jitter (i _c d) between the maximum jitter value jitter (i _c max) and the minimum jitter value jitter (i _c min) is set to a value larger than a predetermined value jitter ( _ic s). The optical disc (M) is an optical disc (M) having poor jitter characteristics. When a signal is read from the optical disc (M) having poor jitter characteristics, the tilt value corresponding to the minimum jitter value jitter ( _ic min) is set as the optimum tilt value, so that a stable tilt operation is executed in the OPU 2. .

If it is determined in step S360 shown in FIG. 20A that [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] is not satisfied (S360: NO), the reference tilt value 0 is optimized. The tilt value is set as a correct tilt value (S380).

FIG. 23 shows a case where it is determined in CPU 10 (FIG. 1) that [jitter (i _c max) −jitter (i _c min)> jitter (i _c s)] is not satisfied (FIG. 20A, S360: NO). FIG. 6 is a characteristic diagram showing a relationship between a jitter value and a tilt value.

When the tilt adjustment of the OBL 4 with respect to the optical disc (M) (FIG. 1) is performed, as shown in FIG. 23, the difference value jitter (( _c min)) between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min). i _c d) is a predetermined value jitter (i _c s)
) When the following small value is set, the reference value 0 of the tilt value is set as the optimum tilt value. When the maximum value-minimum value (MAX-MIN) in each jitter value is not more than a certain value, the tilt value is set to ± 0. For example, when the jitter value of the waveform shown in FIG. 23 is detected, the jitter value jitter (i _c o) at the reference value 0 of the tilt value is set to a value larger than the predetermined jitter value jitter (i _c f), and the maximum The difference value jitter (i _c d) between the jitter value jitter (i _c max) and the minimum jitter value jitter (i _c min) is set to a small value equal to or smaller than a predetermined value jitter (i _c s). In this case, the tilt value is set to ± 0. Alternatively, for example, the jitter value of the waveform shown in FIG. 23 is detected, and each jitter value is set to a value larger than a predetermined jitter value jitter (i _c f), and the maximum jitter value jitter (i _c max) is set. When the difference value jitter (i _c d) from the minimum jitter value jitter (i _c min) is set to a small value less than or equal to a predetermined value jitter (i _c s), the tilt value is set to ± 0. Let it be set.

The minimum jitter value jitter (i _c min) is larger than the jitter value jitter (i _c f), for example, which is smaller than the maximum jitter value jitter (i _c max), for example, by a determination value jitter (i _c s). In such a case, since the change of the jitter value is small, the operation of setting the reference tilt value as the optimum tilt value in the tilt value setting circuit 23 is performed in the optical disc apparatus 1.

CPU10 The program (FIG. 1), the following setting is made based on the value of _{"jitter (i c max) -jitter (} i c min) ". When the value of “jitter (i _c max) −jitter (i _c min)” is equal to or smaller than a predetermined value jitter (i _c s), “TILT” is set to 0. This completes the tilt adjustment.

  When the tilt value setting operation is performed in this manner, the tilt operation by the tilt value setting circuit 23 is performed around the reference tilt value 0. Since tilt setting / operation centering on the reference tilt value 0 is performed, tilt control in the OPU 2 can be stably performed.

By performing the tilt value adjustment method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tilt operation on the optical disc M. A difference value jitter ( _ic d) between the maximum jitter value jitter (i _c max) and the minimum jitter value jitter ( _{ic c} min) is set to a small value equal to or smaller than a predetermined value jitter ( _{ic c} ). The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disc M having relatively good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as an optimum tilt value, so that the tilt operation of the OPU 2 is stable and stable. Are executed in OPU2. In addition, the tilt value can be easily set in the optical disc apparatus 1.

When the tilt adjustment of the OBL 4 with respect to the optical disc (M) (FIG. 1) is performed, as shown in FIG. 24, the difference value jitter (( _c min)) between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min). When i _c d) is set to a small value equal to or smaller than a predetermined value jitter (i _c s), the tilt value reference value 0 is set as the optimum tilt value. When the maximum value-minimum value (MAX-MIN) in each jitter value is not more than a certain value, the tilt value is set to ± 0. For example, when the jitter value of the waveform shown in FIG. 24 is detected, the jitter value jitter (i _c o) at the reference value 0 of the tilt value is set to a value larger than the predetermined jitter value jitter (i _c f), and the maximum The difference value jitter (i _c d) between the jitter value jitter (i _c max) and the minimum jitter value jitter (i _c min) is set to a small value equal to or smaller than a predetermined value jitter (i _c s). In this case, the tilt value is set to ± 0. In such a case, since the change of the jitter value is small, the operation of setting the reference tilt value as the optimum tilt value in the tilt value setting circuit 23 is performed in the optical disc apparatus 1.

In the program in the CPU 10 (FIG. 1), the following setting is performed based on the value of “jitter ( _ic max) −jitter ( _ic min)”. When the value of “jitter (i _c max) −jitter (i _c min)” is equal to or smaller than a predetermined value jitter (i _c s), “TILT” is set to 0. This completes the tilt adjustment.

  When the tilt value setting operation is performed in this manner, the tilt operation by the tilt value setting circuit 23 is performed around the reference tilt value 0. Since tilt setting / operation centering on the reference tilt value 0 is performed, tilt control in the OPU 2 can be stably performed.

By performing the tilt value adjustment method of the optical disc apparatus 1 in this way, the OPU 2 constituting the optical disc apparatus 1 performs a stable tilt operation on the optical disc M. A difference value jitter ( _ic d) between the maximum jitter value jitter (i _c max) and the minimum jitter value jitter ( _{ic c} min) is set to a small value equal to or smaller than a predetermined value jitter ( _{ic c} ). The optical disc M is an optical disc M having relatively good jitter characteristics. When a signal is read from the optical disc M having relatively good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as an optimum tilt value, so that the tilt operation of the OPU 2 is stable and stable. Are executed in OPU2. In addition, the tilt value can be easily set in the optical disc apparatus 1.

When the optical disc (M) is completely installed in the optical disc apparatus 1 and each signal is read from the optical disc (M) to detect each jitter value, and the tilt adjustment of the OBL 4 with respect to the optical disc (M) is performed. The tilt adjustment is performed within a time period exceeding 0 seconds and within approximately 15 seconds. More specifically, after the optical disc (M) is completely installed in the optical disc apparatus 1, the tilt value reference value 0 (FIGS. 22, 23, and 24) is included, and the tilt value reference value 0 is the center. Within a predetermined range of numerical values, the tilt value is changed stepwise (FIG. 20A: S340, FIG. 20B: S341-S346), each signal is read from the optical disc (M) (FIG. 1), and each jitter value is read. is detected, and the maximum jitter value jitter in each jitter value detected _(i c max) (22, 23, 24) the difference between the value jitter _(i c d the minimum jitter value jitter _(i c min) ) (FIG. 20A: S360), when the optimum tilt value adjustment of OBL4 for the optical disk (M) (FIG. 1) is performed, the tilt adjustment is completed within a time period exceeding 0 second and within approximately 10 seconds. It is preferable.

As described above, since the time required for the tilt value adjusting method of the optical disc apparatus 1 is set to a short time, the tilt adjustment is performed in the optical disc apparatus 1 without waiting for a long time for the tilt adjustment. The setting process is immediately completed. After the optical disc (M) is completely installed in the optical disc apparatus 1, the tilt value is stepwise within a predetermined range of values including the reference value 0 of the tilt value and centering on the reference value 0 of the tilt value. The jitter value is detected by reading each signal from the optical disc (M), and the difference between the maximum jitter value jitter ( _ic max) and the minimum jitter value jitter ( _ic min) in each detected jitter value. based on the value jitter _(i c d), the optical disk when the tilt adjustment of OBL4 for (M) is carried out, within a time of 15 seconds or less substantially than 0 seconds, preferably within 10 seconds substantially greater than 0 seconds Since the tilt adjustment is performed within the time, the optical data is read after the optical disk (M) is installed in the optical disk apparatus 1 until the main data / information / signal of the optical disk (M) is read. Disk device 1 is avoided that severely wait a long time for the tilt adjustment to be automatically executed.

As described above, when the optical disc (M) (FIG. 1) is tilt-adjusted by the OBL 4 and the optical disc apparatus 1 is set with the optimum tilt value, first, the reference value 0 of the tilt value (FIG. 22, FIG. 23, FIG. 24), the jitter value is detected, and the reference value 0 of the detected tilt value
Next, when the jitter value jitter (i _c o) based on is set to a value larger than a predetermined jitter value jitter (i _c f), a predetermined range including the reference value 0 of the tilt value (example) : Each jitter value detection step of detecting each jitter value is executed each time the tilt value is changed stepwise within the numerical value of −8% to +8% / − 10% to + 10%).

Thus, the optimum tilt value is set in the optical disc apparatus 1 by performing the tilt value adjusting method of the optical disc apparatus 1 (FIG. 1). Optical disc (M) to carry out the tilt adjustment of OBL4, optimum tilt value when to set the optical disc apparatus 1, firstly jitter value based on the reference value 0 of the tilt value jitter (i c _o) to detect (FIG. 20A: S320). As shown in FIGS. 22, 23, and 24, the jitter value jitter (i _c o) based on the reference value 0 of the tilt value is set to a value larger than a predetermined jitter value jitter (i _c f). The optical disk (M) (FIG. 1) is an optical disk (M) that needs to detect / inspect each jitter value corresponding to each tilt value. As shown in FIG. 20A, when the jitter value jitter (i _c o) based on the reference value 0 of the detected tilt value is larger than a predetermined jitter value jitter (i _c f) ( S330: YES), each time the tilt value is changed stepwise within a predetermined range (eg, -8% to +8% /-10% to + 10%) including the reference value 0 of the tilt value. The jitter value is detected (FIG. 20A: S340, FIG. 20B: S341-S346), and the difference value between the maximum jitter value jitter (i _c max) and the minimum jitter value jitter ( _ic min) in each detected jitter value. based on the jitter _(i c d), to perform the optimum the jitter value detected to set the tilt value / comparison determination / optimal value setting process (Fig. 20A: S340, FIG. 20B: S341~S346 FIG. 20A: S350, S360, S370 / S380).

  Further, the tilt value is stepwise within a numerical value within a predetermined range (eg, −10% to +10% / − 8% to + 8%) including the reference value 0 (FIG. 22, FIG. 23, FIG. 24) of the tilt value. The increment of the tilt value at the time of changing to is set to a numerical value within the range of 0.5% to 5% of the entire tilt value, specifically, a numerical value within the range of 1% to 4%. When the increment of the tilt value is set to a fine increment of less than 0.5% of the entire tilt value, for example, a large amount of data is acquired, and there is a concern that the time required for the tilt adjustment becomes long. Further, when the increment of the tilt value is set to a coarse increment exceeding 5% of the entire tilt value, for example, there is a concern that accurate tilt adjustment cannot be performed because the number of acquired data is insufficient. By setting the increment of the tilt value to a value within the range of 1% to 4% with respect to the entire tilt value, preferably the increment of the tilt value is set to 2% of the entire tilt value, the time required for tilt adjustment is significant. Tilt adjustment that is not long and has relatively high accuracy is executed.

As shown in FIGS. 25 and 26, the jitter value is detected every time the tilt value is changed stepwise within a predetermined range of values including the reference value 0 of the tilt value and centering on the reference value 0 of the tilt value. before to perform, is detected jitter value based on the reference value 0 of the tilt value, the detected jitter value jitter based on the reference value 0 of the tilt value (i c _o) is a predetermined jitter value determined in advance jitter when (i c _f) is the following smaller value to set the reference value 0 of the tilt values as an optimal tilt value.

More specifically, when the tilt adjustment of the OBL 4 is performed on the optical disc M (FIG. 1) and the optimum tilt value is set in the optical disc apparatus 1, first, based on the reference value 0 (FIG. 25) of the tilt value. When the jitter value is detected and the jitter value jitter (i _c o) based on the reference value 0 of the detected tilt value is set to a small value equal to or smaller than a predetermined jitter value jitter (i _c f). Each time the tilt value is changed stepwise within a predetermined range of values including the tilt value reference value 0, each jitter value detection step is omitted without detecting each jitter value, and the tilt value reference value 0 is obtained. detecting step of based jitter value jitter _(i c o), and the jitter value jitter predetermined predetermined jitter value jitter of the _(i c f) based on the reference value 0 of the tilt value _{(i c} Immediately after the comparison determination step with o), the reference value 0 of the tilt value is set as the optimum tilt value.

When the tilt value is ± 0, the optimum tilt value is set to ± 0 when the jitter value jitter (i _c o) is set to a small value equal to or smaller than a predetermined jitter value jitter (i _c f). Let it be set. When the optical disc M having good jitter characteristics is used, priority is given to the stability of the tilt operation.

By performing the tilt value adjusting method of the optical disc apparatus 1 (FIG. 1) as described above, when the optical disc M having good jitter characteristics is used, the tilt value is set quickly and the optical disc apparatus 1 is configured. The OPU 2 to perform a stable tilt operation on the optical disc M. On the optical disc M to perform the tilt adjustment of OBL4, when to set the optimum tilt value to the optical disc apparatus 1, to detect the jitter value based on the reference value 0 of the tilt value jitter (i c _o) First ( FIG. 20A: S320). As shown in FIG. 25, the optical disk M (FIG. 1) in which the jitter value jitter (i _c o) based on the reference value 0 of the tilt value is a smaller value than a predetermined jitter value jitter (i _c f). Is an optical disc M with good jitter characteristics.

When a signal is read from the optical disc M having good jitter characteristics, each jitter value is detected without detecting each jitter value every time the tilt value is changed stepwise within a predetermined range of values including the reference value 0 of the tilt value. / comparison determination step (Fig. 20A: S340, FIG. 20B: S341~S346, FIG. 20A: S350, S360) is omitted, detection step (Fig jitter value based on the reference value 0 of the tilt value jitter _(i c o) 20A: S320) and a comparison determination step (FIG. 20A: S330) between a predetermined jitter value jitter (i _c f) and a jitter value jitter (i _c o) based on the reference value 0 of the tilt value. Immediately after, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as the optimum tilt value (FIG. 20A: S380). Setting time of the tilt value is shortened. In addition, when a signal is read from the optical disc M having good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as the optimum tilt value, so that the tilt operation of the OPU 2 can be performed stably without any trouble. Are executed in OPU2.

Further, when the tilt adjustment of OBL 4 is performed on the optical disc M (FIG. 1) and the optical disc apparatus 1 is set with the optimum tilt value, first, the jitter value is based on the reference value 0 (FIG. 26) of the tilt value. When the jitter value jitter (i _c o) based on the reference value 0 of the detected tilt value is set to a small value equal to or smaller than a predetermined jitter value jitter (i _c f), the tilt Each jitter value detection step is omitted without detecting each jitter value every time the tilt value is changed stepwise within a predetermined range of values including the reference value 0 of the value, and based on the reference value 0 of the tilt value. Jitter value jitter (i _c o) detection step, and comparison between a predetermined jitter value jitter (i _c f) and a jitter value jitter (i _c o) based on a tilt value reference value 0 Immediately after the determination step, the reference value 0 of the tilt value is set as the optimum tilt value.

When the tilt value is ± 0, the optimum tilt value is set to ± 0 when the jitter value jitter (i _c o) is set to a small value equal to or smaller than a predetermined jitter value jitter (i _c f). Let it be set. When the optical disc M having good jitter characteristics is used, priority is given to the stability of the tilt operation.

By performing the tilt value adjusting method of the optical disc apparatus 1 (FIG. 1) as described above, when the optical disc M having good jitter characteristics is used, the tilt value is set quickly and the optical disc apparatus 1 is configured. The OPU 2 to perform a stable tilt operation on the optical disc M. On the optical disc M to perform the tilt adjustment of OBL4, when to set the optimum tilt value to the optical disc apparatus 1, to detect the jitter value based on the reference value 0 of the tilt value jitter (i c _o) First ( FIG. 20A: S320). As shown in FIG. 26, the optical disc M in which the jitter value jitter (i _c o) based on the reference value 0 of the tilt value is set to a smaller value than a predetermined jitter value jitter (i _c f) (FIG. 1). Is an optical disc M with good jitter characteristics. Further, for example, as shown in FIG. 26, all the jitter values between the maximum jitter value jitter (i _c max) and the minimum jitter value jitter (i _c min) are all determined as predetermined jitter values jitter (i _{c f)} following a small value and optical disc M (FIG. 1) is a good optical disk M jitter characteristics.

When a signal is read from the optical disc M having good jitter characteristics, each jitter value is detected without detecting each jitter value every time the tilt value is changed stepwise within a predetermined range of values including the reference value 0 of the tilt value. / comparison determination step (Fig. 20A: S340, FIG. 20B: S341~S346, FIG. 20A: S350, S360) is omitted, detection step (Fig jitter value based on the reference value 0 of the tilt value jitter _(i c o) 20A: S320) and a comparison determination step (FIG. 20A: S330) between a predetermined jitter value jitter (i _c f) and a jitter value jitter (i _c o) based on the reference value 0 of the tilt value. Immediately after, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as the optimum tilt value (FIG. 20A: S380). Setting time of the tilt value is shortened. In addition, when a signal is read from the optical disc M having good jitter characteristics, the optical disc apparatus 1 is set with the reference value 0 of the tilt value as the optimum tilt value, so that the tilt operation of the OPU 2 can be performed stably without any trouble. Are executed in OPU2.

  Since the tilt value ± 0 is first measured and set, the measurement time for detecting the jitter value can be shortened. The tilt adjustment can be executed by the optical disc apparatus 1 provided with the OPU 2 only for the optical disc (M) that is estimated / determined that the jitter value is not good and needs to detect / inspect each jitter value. Since the tilt adjustment is performed only on the optical disc (M) that is estimated / determined that the jitter value is not good and each jitter value needs to be detected / inspected, the initial measurement time of the optical disc M with good jitter characteristics in the OPU 2 is reduced. It can be shortened. Further, since the tilt value is set to ± 0 for the optical disc M having good jitter, stable tilt setting can be executed for the optical disc M having good jitter. When the optical disc apparatus 1 is equipped with an optical disc M in which the jitter value does not substantially change, the tilt value in the tilt value setting circuit 23 is set to ± 0, so that a servo failure does not occur and a stable tilt operation can be executed. Become.

As described above, the tilt value adjustment method of the optical disc apparatus 1 detects the jitter value every time the tilt value is changed by the predetermined percentage within the predetermined range centered on the reference value 0 of the tilt value. An optimum tilt value setting operation is performed. Before performing such an operation, a jitter value detection operation is performed in a state where the reference tilt value is set to 0 and the tilt value is set. When the detected jitter value jitter (i _c o) is a small value equal to or smaller than the predetermined value jitter (i _c f), that is, when it is determined that the reproduction characteristic of the optical disc M is good, the reference tilt is used as it is. The operation of setting the value 0 as the optimum tilt value is performed in the optical disc apparatus 1.

When the jitter value jitter (i _c o) detected / set for performing the determination operation is detected as a small jitter value equal to or smaller than a predetermined jitter value jitter (i _c f), for example, the optical disk M is changed to a benign disk. Thus, the reproducing operation can be performed without any trouble without performing the tilt value selecting operation.

After the optical disk M with good jitter characteristics is completely installed in the optical disk apparatus 1, when the tilt adjustment of the OBL 4 with respect to the optical disk M with good jitter characteristics is performed in the optical disk apparatus 1, it exceeds 0 seconds and is approximately 3 seconds. The tilt adjustment is performed within a period of time, preferably within 0 second and within approximately 1 second.

  When the tilt adjustment of the OBL 4 with respect to the optical disc M is performed after the optical disc M having a good jitter characteristic is completely installed in the optical disc apparatus 1, it is within 0 second and within about 3 seconds, preferably 0 second. Since the tilt adjustment is performed within a time exceeding about 1 second, the optical disk apparatus 1 automatically executes until the main data / information / signal of the optical disk M is read after the optical disk M is installed in the optical disk apparatus 1. There is no need to wait for a long time for tilt adjustment. The tilt adjustment in the optical disc apparatus 1 when the optical disc M having good jitter characteristics is installed in the optical disc apparatus 1 is quickly completed in a short time.

  Next, a state when a track jump of the OPU 2 is performed when a tilt value other than the reference value 0 is set will be described.

  First, tilt adjustment of the optical disc apparatus 1 (FIG. 1) is performed. At this time, the tilt value is set to a numerical value other than the reference value 0. Before starting the track jump, the reference value 0 is set as the tilt value. Perform a track jump operation. After the track jump, the tilt value is set to a value other than the original reference value 0.

  The operation of the optical disc apparatus 1 from the start to the end of the track jump process will be described in detail. Among the tilt values within a predetermined range, the optimum tilt value is set to any biased value other than the reference value 0. When set (FIG. 20A: S370, FIG. 21, S391: NO, FIG. 22), the tilt value is temporarily used as a reference when the OPU 2 performs track jump on the optical disc (M) (FIG. 1). Set the value to 0. After the tilt value is temporarily set to the reference value 0 (FIG. 21: S392), the OPU 2 (FIG. 1) is caused to execute a track jump (FIG. 21: S393).

  When the tilt value is set in the optical disc apparatus (FIG. 1) as in steps S391 and S392 of FIG. 21, any biased value other than the reference value 0 of the tilt value is selected from among the tilt values within a predetermined range. Even if (example: + 6%) is set as the optimum tilt value, the track jump of the OPU 2 with respect to the optical disc (M) is performed well. When the tilt adjustment of the OPU 2 with respect to the optical disc (M) is performed and the tilt value is set to a deviated numerical value (+ 6%) other than the reference value 0, the track jump of the OPU 2 with respect to the optical disc (M) is performed. In addition, servo failure was likely to occur in OPU2. However, even when the tilt value is set to a deviated numerical value other than the reference value 0, when the OPU 2 performs a track jump, the tilt value is temporarily set to the reference value 0, so that the optical disc ( The track jump of the OPU 2 with respect to M) is likely to be performed normally.

  After the track jump of the OPU 2 with respect to the optical disc (M) (FIG. 1) is executed (FIG. 21: S393) and the track jump operation is completed, the tilt value is again an original biased value other than the reference value 0 (eg, +6) %) (FIG. 21: S395, FIG. 22). Since the initial optimum tilt value is set to a deviated numerical value other than the reference value 0 (FIG. 21, S394: NO, FIG. 22), the tilt value is again changed to the original value other than the reference value 0 after the track jump is completed. It returns to the biased numerical value (example: + 6%) (FIG. 21: S395).

Thereby, the optimum tilt value for the optical disc apparatus 1 is set again. When the track jump of the OPU 2 is not performed on the optical disc (M), the optical disc apparatus 1 is set again with a deviated numerical value other than the reference value 0 of the tilt value as the optimum tilt value, so that the OPU 2 of the optical disc (M) is set. The tilt adjustment of OBL2 is performed satisfactorily. In addition, since the tilt value other than the reference value 0 previously stored in the second memory circuit 12 is again set as the optimum tilt value in the optical disc apparatus 1, the optimum tilt value is quickly reset.

  Next, a state when the track jump of the OPU 2 is performed when the optimum tilt value is set to the reference value 0 will be described. The operation of the optical disc apparatus 1 from the start to the end of the track jump process when the optimum tilt value is set to the reference value 0 will be described in detail. The optimum tilt value is set to the reference value 0. In the case (FIG. 21, S391: YES, FIG. 23, FIG. 24, FIG. 25, FIG. 26), the track jump is executed by the OPU 2 (FIG. 1) without changing the tilt value (FIG. 21: S393). Since the optimum tilt value continues to be set to the reference value 0, the track jump of the OPU 2 with respect to the optical disc M / (M) (FIG. 1) is performed normally. The initial optimum tilt value is set to the reference value 0 (FIG. 21, S394: YES, FIG. 23, FIG. 24, FIG. 25, FIG. 26), and the tilt value is changed after the track jump ends. The optimum tilt value is maintained at the reference value 0.

  The optical disc apparatus 1 shown in FIG. 1 performs at least one of the setting steps selected from the group consisting of the defocus value setting step, the detrack value setting step, and the tilt value setting step. It is configured to be executable. As a result, at least one optimum value among the optimum defocus value, optimum detrack value, and optimum tilt value is set in the optical disc apparatus 1.

  More specifically, the optical disc apparatus 1 shown in FIG. 1 is an optical disc apparatus 1 that can execute the defocus value adjustment method of the optical disc apparatus 1. Thereby, it is possible to provide the optical disc apparatus 1 capable of setting an optimum defocus value. F dropping is prevented and stable focusing servo is executed by the optical disc apparatus 1 provided with the OPU 2.

  An optical disc apparatus 1 shown in FIG. 1 is an optical disc apparatus 1 that can execute the detrack value adjustment method of the optical disc apparatus 1. Thereby, it is possible to provide the optical disc apparatus 1 capable of setting an optimum detrack value. Track skipping is prevented, and stable tracking servo is executed by the optical disc apparatus 1 including the OPU 2.

  An optical disc apparatus 1 shown in FIG. 1 is an optical disc apparatus 1 that can execute the tilt value adjusting method of the optical disc apparatus 1. Thereby, it is possible to provide the optical disc apparatus 1 capable of setting an optimum tilt value. Servo failure is prevented and a stable tilt operation is executed by the optical disc apparatus 1 including the OPU 2.

  If the tilt adjustment circuit of the optical disc apparatus 1 is configured, even if the optical disc (M) provided in the optical disc apparatus 1 is a surface wobbling disc MA (FIG. 2), the signal layer Ms of the optical disc MA The optical axis La of the laser light L emitted from the LD 3 of the OPU 2 (FIG. 1) is always easy to be orthogonal (FIG. 2).

When the surface shake operation occurs on the optical disc (M), the focusing adjustment of the OBL 4 and the focusing tilt adjustment of the OBL 4 are performed simultaneously. When the surface shake operation occurs on the optical disc (M), the position of the OBL 4 is automatically adjusted along the vertical direction Da. At the same time, the posture of the OBL 4 is automatically adjusted so that the optical axis La of the laser light transmitted through the OBL 4 is inclined by an angle −Af to + Af. As a result, the optical axis La of the laser beam is always kept orthogonal to the signal layer Ms of the optical disc MA, and the spot Ls formed by the laser beam being narrowed by the OBL 4 is shifted from the pit Mt being followed. This is avoided. Accordingly, it is easy to prevent the occurrence of a focus drop and an error in reading the data on the optical disc MA when the data on the optical disc MA is being read using the OPU 2 (FIG. 1).

  Defocusing occurs due to surface deflection of the optical disc (M), eccentricity of the optical disc (M), vibration of the optical disc (M), and impact of the optical disc (M). When the optical disk device 1 is used to reproduce data recorded on the optical disk (M) or when data is recorded on the optical disk (M), the surface vibration of the optical disk (M) in the optical disk device 1 In addition, the eccentricity of the optical disk (M) is supposed to occur constantly. On the other hand, the vibration of the optical disc (M) and the impact of the optical disc (M) are suddenly generated.

  If the tilt adjustment circuit of the optical disc apparatus 1 is configured, even if the optical disc (M) provided in the optical disc apparatus 1 is the eccentric disc MB (FIGS. 4A and 4B), the optical disc MB The optical axis La of the laser light L emitted from the LD 3 of the OPU 2 (FIG. 1) is always easily orthogonal to the signal layer Ms.

  When an eccentric operation occurs in the optical disc (M) (FIGS. 4A and 4B), tracking adjustment of OBL4 and tracking tilt adjustment of OBL4 are performed simultaneously. When an eccentric operation occurs in the optical disc (M), the position of the OBL 4 is automatically adjusted along the disc inner / outer direction Db. At the same time, even if the optical axis La of the laser light transmitted through the OBL 4 is inclined by an angle of −At to + At, the posture of the OBL 4 is automatically adjusted. The optical axis La of the laser beam is always kept orthogonal to the signal layer Ms of the optical disc MA, and the spot Ls formed by the laser beam being narrowed by the OBL 4 is shifted from the pit Mt being followed. Is avoided. Therefore, it is easy to prevent the occurrence of a focus drop and an error in reading the data on the optical disc MB when the data on the optical disc MB is being read using the OPU 2 (FIG. 1).

  Further, even when the optical disc (M) provided in the optical disc apparatus 1 is the runout disc MA (FIG. 2), the optical disc (M) provided in the optical disc apparatus 1 is the eccentric disc MB (FIG. 4 (A) ( Even in the case of B)), the track jump of the OPU 2 with respect to the optical disc MA or the optical disc MB is likely to be normally performed.

  The optical disc apparatus 1 shown in FIG. 1 is configured to be able to execute three processes of the defocus value setting process, the detrack value setting process, and the tilt value setting process. Depending on the design / specification, for example, the optical disc apparatus 1 capable of executing the two steps of the defocus value setting step and the detrack value setting step may be configured. Further, depending on the design / specification of the optical disc apparatus 1, for example, the optical disc apparatus 1 capable of executing the two steps of the detrack value setting step and the tilt value setting step may be configured. Further, depending on the design / specification of the optical disc apparatus 1, for example, the optical disc apparatus 1 capable of executing two steps of the tilt value setting step and the defocus value setting step may be configured.

  Depending on the design / specification of the optical disc apparatus 1, for example, an optical disc apparatus capable of executing a plurality of required steps among the defocus value setting step, the detrack value setting step, and the tilt value setting step. 1 may be configured. Among the defocus value setting step, the detrack value setting step, and the tilt value setting step, a plurality of required steps are executed individually or simultaneously.

For example, the optical disc apparatus 1 adjusts the optical disc apparatus 1 that can set the optimum detrack value (FIG. 6A to FIG. 12) to the adjustment method (FIGS. 6A to 12) that can set the optimum defocus value. 13A to FIG. 19) and / or a single optical disc apparatus 1 (FIG. 1) in which the adjustment method (FIGS. 20A to 26) of the optical disc apparatus 1 capable of setting the optimum tilt value is executed in combination or in combination. Composed.

  For example, by configuring the optical disc apparatus 1 in this way, it is possible to provide the optical disc apparatus 1 capable of setting an optimum detrack value and / or an optimum tilt value in a relatively short time in addition to an optimum defocus value. It becomes.

  When the setting steps are performed after the optical disk (M) that is estimated / determined that the jitter value is not good and needs to be detected / inspected for each jitter value is completely installed in the optical disk apparatus 1, For example, each setting step is performed within a total time exceeding 0 seconds and within approximately 60 seconds, preferably within a total time exceeding 0 seconds and within approximately 45 seconds, more preferably within a total time exceeding 0 seconds and within approximately 30 seconds. Make it.

  As a result, the main data of the optical disc (M) after the optical disc (M) that is estimated / determined that the jitter value is not good and needs to be detected / inspected for each jitter value is completely installed in the optical disc apparatus 1. It is avoided that the optical disk apparatus 1 waits for a long time for each setting process that is automatically executed before the / information / signal starts to be read. It is ideal that each setting step is executed in a short time, for example, infinitely close to approximately 0 seconds. Since the total time of each setting step is, for example, within about 60 seconds, preferably within about 45 seconds, and more preferably within about 30 seconds, the waiting time for each setting step that is automatically executed by the optical disc apparatus 1 is The optical disc apparatus 1 is within the allowable range of the user / designer.

  Further, when the above-described setting steps are performed after the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1, for example, within a total time exceeding 0 seconds and within approximately 15 seconds, preferably 0 seconds. Each setting step is performed within a total time exceeding approximately 10 seconds, and more preferably within a total time exceeding 0 seconds and approximately 5 seconds.

  As a result, each setting process automatically executed by the optical disc apparatus 1 until the main data / information / signal of the optical disc M starts to be read after the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1. Therefore, it is avoided that the user waits for a long time, and each setting process is quickly completed in a short time. It is ideal that each setting step is executed in a short time, for example, infinitely close to approximately 0 seconds. The total time of each setting step after the optical disc M having good jitter characteristics is completely installed in the optical disc apparatus 1 is, for example, within about 15 seconds, preferably within about 10 seconds, and more preferably within about 5 seconds. Therefore, for example, stress is prevented from accumulating on the user / designer of the optical disk device 1 due to the waiting time of each setting process automatically executed by the optical disk device 1.

  The optical disc apparatus 1 including the OPU 2 can be used for a recording / reproducing apparatus that records data / information / signals on the various optical discs M and reproduces data / information / signals on the various optical discs M. . Further, the optical disk device 1 provided with the OPU 2 can be used as a reproduction-only device for reproducing data / information / signals and the like of the various optical disks M.

The OPU 2 is installed in the optical disc apparatus 1 that is assembled in, for example, a computer, audio / video equipment, game machine, in-vehicle device (none of which is shown). The optical disk device 1 including the OPU 2 includes, for example, a notebook personal computer (PC), a laptop PC, a desktop PC, a computer such as an in-vehicle computer, a game machine such as a computer game machine, It can be installed in audio and / or video equipment such as a CD player / CD recorder and a DVD player / DVD recorder (both not shown). Further, the optical disc apparatus 1 including the OPU 2 can be adapted to a plurality of media M such as a CD-type optical disc, a DVD-type optical disc, and a “Blu-ray Disc” -type optical disc. The optical disc apparatus 1 provided with the OPU 2 is a computer, an audio and / or video device, a game machine, an in-vehicle device, etc. compatible with various optical discs M such as “CD”, “DVD”, “HD-DVD”, “Blu ray Disc” Can be equipped (none is shown).

  As mentioned above, although embodiment of this invention was described, embodiment of the invention mentioned above is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is a block diagram which shows one Embodiment of the disk apparatus based on this invention. It is explanatory drawing which shows the operation state of the surface shake disc used as the medium with which the disc apparatus was equipped. It is a wave form diagram which shows a rocking | fluctuation period when the surface shake disc used as a medium is rotated. The operation state of an eccentric disk, which is a medium installed in the disk device, is shown. (A) is an explanatory view showing a state where the objective lens is tilted toward the disk outer peripheral side of the eccentric disk, and (B) is an eccentricity. It is explanatory drawing which shows the state in which the objective lens was inclined toward the disc inner peripheral side of the disc. It is a wave form diagram which shows a rocking | fluctuation period when the eccentric disk used as a medium is rotated. 4 is a flowchart illustrating an embodiment of a defocus value adjustment method for a disk device. It is a flowchart which shows each jitter value detection process of the defocus value adjustment method of a disc apparatus. It is a flowchart which shows a track jump process when the defocus value adjustment method of a disc apparatus is performed. It is a graph which shows the relationship between a defocus value and a jitter value. It is a graph which similarly shows the relationship between a defocus value and a jitter value. It is a graph which similarly shows the relationship between a defocus value and a jitter value. It is a graph which similarly shows the relationship between a defocus value and a jitter value. It is a graph which similarly shows the relationship between a defocus value and a jitter value. 3 is a flowchart illustrating an embodiment of a detrack value adjustment method for a disk device. It is a flowchart which shows each jitter value detection process of the detrack value adjustment method of a disc apparatus. It is a flowchart which shows a track jump process when the detrack value adjustment method of a disc apparatus is performed. It is a graph which shows the relationship between a detrack value and a jitter value. It is a graph which similarly shows the relationship between a detrack value and a jitter value. It is a graph which similarly shows the relationship between a detrack value and a jitter value. It is a graph which similarly shows the relationship between a detrack value and a jitter value. It is a graph which similarly shows the relationship between a detrack value and a jitter value. 4 is a flowchart illustrating an embodiment of a tilt value adjustment method for a disk device. It is a flowchart which shows each jitter value detection process of the tilt value adjustment method of a disc apparatus. It is a flowchart which shows a track jump process when the tilt value adjustment method of a disc apparatus is performed. It is a graph which shows the relationship between a tilt value and a jitter value. It is a graph which similarly shows the relationship between a tilt value and a jitter value. It is a graph which similarly shows the relationship between a tilt value and a jitter value. It is a graph which similarly shows the relationship between a tilt value and a jitter value. It is a graph which similarly shows the relationship between a tilt value and a jitter value.

Explanation of symbols

1 Optical disk device (disk device)
2 OPU (Pickup device)
3 LD (light emitting device)
4 OBL (objective lens)
5 PDIC (Photodetector)
6 Front-end processing unit (optical output signal processing circuit)
7 RF signal amplification / processing circuit (signal processing circuit)
8 Digital signal processing circuit 9 Jitter measurement circuit (jitter value detection circuit)
10 CPU (system control circuit)
11 ROM (memory circuit)
12 RAM (memory circuit)
21 Defocus value setting circuit (setting circuit)
22 Detrack value setting circuit (setting circuit)
23 Tilt value setting circuit (setting circuit)
31 EQ (Focusing servo circuit)
32 EQ (tracking servo circuit)
41 Focusing tilt bandpass filter circuit (bandpass filter circuit)
42 Tracking tilt bandpass filter circuit (bandpass filter circuit)
51 Focusing tilt signal adjustment circuit (tilt signal adjustment circuit)
52 Tracking tilt signal adjustment circuit (tilt signal adjustment circuit)
53 Addition circuit 61 Driver (Focusing coil drive circuit)
62 Driver (Tracking coil drive circuit)
63 Driver (tilt coil drive circuit)
71 Focusing coil (coil)
72 Tracking coil (coil)
73 Tilt coil (coil)
Af, At angle Cf, Ct Rotation period Da Up / down direction of disc (up / down direction)
Da ₁ lower side direction Da ₂ upper side direction Db disc inside / outside direction (inside / outside direction)
Db ₁ inner direction Db ₂ outer direction Df Focusing direction (direction)
Dt Tracking direction (direction)
FDO focusing control signal L beam (light)
La Optical axis Ls Spot (focus)
M Optical disc (media)
MA Surface runout disc (optical disc)
MB Eccentric disc (optical disc)
Mc inner circumference (inner circumference)
Md outer periphery Mf surface (surface)
Ms Signal surface (signal layer)
Mt pit (signal part)
TDO tracking control signal

Claims (31)

A jitter value detection circuit that detects a jitter value based on a signal read from the medium,
A defocus value used to move the objective lens along the optical axis direction of the objective lens when the objective lens is focused on the medium based on a signal passing through the jitter value detection circuit. A setting circuit that adjusts and performs defocus adjustment based on the defocus value;
A detrack value used to move the objective lens along the radial direction of the medium when the objective lens is focused on the medium is adjusted based on a signal passing through the jitter value detection circuit. And a setting circuit for performing detrack adjustment based on the detrack value;
A tilt value used to correct an angular deviation of the objective lens with respect to the signal layer of the media when the objective lens is focused on the media based on a signal that has passed through the jitter value detection circuit. A setting circuit for adjusting the tilt and adjusting the tilt based on the tilt value;
A disk device comprising: at least one setting circuit among setting circuits selected from the group consisting of: Using a disk device equipped with an optical pickup device having an objective lens, the jitter value of a signal read from the medium is detected, and the position of the objective lens relative to the medium is adjusted based on the jitter value. A disk device adjustment method,
Based on the jitter value, when the objective lens is focused on the medium, a defocus value used for moving the objective lens along the optical axis direction of the objective lens is adjusted, and the medium is adjusted. When the focus adjustment of the objective lens is performed, and the defocus value is changed stepwise within a predetermined range including the reference value of the defocus value, if necessary, the jitter Detecting a value and setting an optimum defocus value based on a difference value between a maximum jitter value and a minimum jitter value in each detected jitter value;
Based on the jitter value, when the objective lens is focused on the medium, a detrack value used to move the objective lens along the radial direction of the medium is adjusted, so that the medium with respect to the medium is adjusted. When the tracking adjustment of the objective lens is performed, the jitter value is changed every time the detrack value is changed stepwise within a predetermined range including the reference value of the detrack value, if necessary. Detecting, and setting an optimum detrack value based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value;
Based on the jitter value, when the objective lens is focused on the medium, a tilt value used for correcting an angular deviation of the objective lens with respect to the signal layer of the medium is adjusted to When the tilt adjustment of the objective lens is performed, the jitter value is detected whenever the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, if necessary. And setting an optimum tilt value based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value;
A method of adjusting a disk device, wherein at least one of the steps is executed. A focusing error signal generated based on a signal detected by a photodetector provided in the optical pickup device is input, and substantially along the optical axis direction orthogonal to the surface of the medium. A focusing servo circuit for generating a control signal for displacing an objective lens equipped in the optical pickup device;
A tracking servo circuit that receives a tracking error signal generated based on a signal detected by the photodetector and generates a control signal that displaces the objective lens substantially along the radial direction of the medium; and
A jitter value detection circuit for detecting a jitter value based on the signal detected by the photodetector;
A defocus value used to move the objective lens along the optical axis direction of the objective lens when the objective lens is focused on the medium based on a signal passing through the jitter value detection circuit. And a defocus value setting circuit for making the focusing servo circuit perform defocus adjustment based on the defocus value;
A detrack value used to move the objective lens along the radial direction of the medium is adjusted when the objective lens is focused on the medium based on a signal passing through the jitter value detection circuit. And a detrack value setting circuit for making the tracking servo circuit perform detrack adjustment based on the detrack value;
A tilt value used to correct an angular deviation of the objective lens with respect to the signal layer of the medium is adjusted based on a signal passing through the jitter value detection circuit when the objective lens is focused on the medium. And a tilt value setting circuit for performing tilt adjustment based on the tilt value;
A disk device adjustment method for adjusting the position of the objective lens with respect to the medium using a disk device comprising:
When reading the signal from the media and detecting the jitter value,
If necessary, the jitter value is detected every time the defocus value is changed stepwise within a predetermined range of values including the defocus value reference value, and the maximum jitter value in each detected jitter value is detected. A step of setting an optimum defocus value based on the difference between the minimum jitter value and
If necessary, the jitter value is detected every time the detrack value is changed stepwise within a predetermined range of values including a reference value of the detrack value, and the maximum jitter value in each detected jitter value A step of setting an optimum detrack value based on the difference between the minimum jitter value and the minimum jitter value;
If necessary, the jitter value is detected each time the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, and the maximum jitter value and the minimum value of each detected jitter value are detected. A step of setting an optimum tilt value based on a difference value from the jitter value;
A method of adjusting a disk device, wherein at least one of the steps is executed. A jitter value detection circuit for detecting a jitter value based on a signal read from the medium;
A defocus value used to move the objective lens along the optical axis direction of the objective lens when the objective lens is focused on the medium based on a signal passing through the jitter value detection circuit. A setting circuit that adjusts and performs defocus adjustment based on the defocus value;
Comprising at least
The disk device, wherein when the defocus adjustment of the objective lens is performed on the medium, the defocus adjustment is performed within approximately 20 seconds. A disk device that uses an optical pickup device having an objective lens to detect a jitter value of a signal read from a medium and adjusts the position of the objective lens relative to the medium based on the jitter value. And
Based on the jitter value, when the objective lens is focused on the medium, a defocus value used for moving the objective lens along the optical axis direction of the objective lens is adjusted, and the medium is adjusted. When the focus adjustment of the objective lens is performed, and the defocus value is changed stepwise within a predetermined range including the reference value of the defocus value, if necessary, the jitter A disk device characterized by detecting a value and setting an optimum defocus value within approximately 20 seconds based on a difference value between a maximum jitter value and a minimum jitter value in each detected jitter value. When the defocus adjustment of the objective lens is performed on the medium, the minimum jitter is set when a difference value between the maximum jitter value and the minimum jitter value is larger than a predetermined value. 6. The disk device according to claim 5, wherein the defocus value corresponding to a value is set as the optimum defocus value. When the defocus adjustment of the objective lens is performed on the medium, the defocus is performed when a difference value between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value. The disk device according to claim 5, wherein the reference value of the value is set as the optimum defocus value. 8. The disk device according to claim 5, wherein when the defocus adjustment of the objective lens is performed on the medium, the defocus adjustment is performed within approximately 15 seconds. When the defocus adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the defocus value, and the detected jitter value is set to a predetermined value. The jitter value is detected each time the defocus value is changed stepwise within the predetermined range of values including the reference value of the defocus value when the value is larger than the jitter value. The disk device according to claim 5, wherein the disk device is a disk device. When the defocus adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the defocus value, and the detected jitter value is set to a predetermined value. Without detecting the jitter value every time the defocus value is changed stepwise within the predetermined range of values including the reference value of the defocus value when the value is smaller than the jitter value The disk device according to claim 5, wherein the reference value of the defocus value is set as the optimum defocus value. When the optimum defocus value is set to the numerical value other than the reference value, the defocus value is set to the reference value when the optical pickup device performs a track jump on the medium. The disk device according to any one of claims 5 to 10, wherein The disk apparatus according to claim 11, wherein the defocus value is returned to the numerical value other than the reference value after the track jump of the optical pickup apparatus with respect to the medium is completed. A jitter value detection circuit for detecting a jitter value based on a signal read from the medium;
A detrack value used for moving the objective lens along the radial direction of the medium is adjusted when the objective lens is focused on the medium based on a signal passing through the jitter value detection circuit. And a setting circuit for performing detrack adjustment based on the detrack value;
Comprising at least
The disk device, wherein when the detrack adjustment of the objective lens is performed on the medium, the detrack adjustment is performed within approximately 20 seconds. A disk device that uses an optical pickup device having an objective lens to detect a jitter value of a signal read from a medium and adjusts the position of the objective lens relative to the medium based on the jitter value. And
Based on the jitter value, when the objective lens is focused on the medium, a detrack value used to move the objective lens along the radial direction of the medium is adjusted, so that the medium with respect to the medium is adjusted. When the tracking adjustment of the objective lens is performed, the jitter value is changed every time the detrack value is changed stepwise within a predetermined range including the reference value of the detrack value, if necessary. A disc device characterized in that an optimum detrack value is set within approximately 20 seconds based on a difference value between a maximum jitter value and a minimum jitter value in each detected jitter value. When the detrack adjustment of the objective lens is performed on the medium, the minimum jitter is set when a difference value between the maximum jitter value and the minimum jitter value is larger than a predetermined value. The disk device according to claim 14, wherein the detrack value corresponding to a value is set as the optimum detrack value. When the detrack adjustment of the objective lens is performed on the medium, the detrack is performed when a difference value between the maximum jitter value and the minimum jitter value is set to a small value equal to or smaller than a predetermined value. 16. The disk device according to claim 14, wherein the reference value of the value is set as the optimum detrack value. The disk device according to any one of claims 14 to 16, wherein when the detrack adjustment of the objective lens is performed on the medium, the detrack adjustment is performed within approximately 15 seconds. When the detrack adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the detrack value, and the detected jitter value is set to a predetermined value. The jitter value is detected each time the detrack value is changed stepwise within the predetermined range of values including the reference value of the detrack value when the value is larger than the jitter value. The disk device according to any one of claims 14 to 17, characterized in that: When the detrack adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the detrack value, and the detected jitter value is set to a predetermined value. Without making the jitter value detected every time the detrack value is changed stepwise within the predetermined range of values including the reference value of the detrack value when the value is smaller than the jitter value The disk device according to any one of claims 14 to 18, wherein the reference value of the detrack value is set as the optimum detrack value. When the optimum detrack value is set to the numerical value other than the reference value, the detrack value is set to the reference value when the optical pickup device performs a track jump on the medium. The disk device according to any one of claims 14 to 19, wherein: 21. The disk device according to claim 20, wherein the detrack value is returned to the numerical value other than the reference value after the track jump of the optical pickup device with respect to the medium is completed. A jitter value detection circuit for detecting a jitter value based on a signal read from the medium;
A tilt value used to correct an angular deviation of the objective lens with respect to the signal layer of the media is adjusted based on a signal passing through the jitter value detection circuit when the objective lens is focused on the media. And a setting circuit for performing tilt adjustment based on the tilt value;
Comprising at least
The disk apparatus, wherein when the tilt adjustment of the objective lens is performed on the medium, the tilt adjustment is performed within approximately 20 seconds. A disk device that uses an optical pickup device having an objective lens to detect a jitter value of a signal read from a medium and adjusts the position of the objective lens relative to the medium based on the jitter value. And
Based on the jitter value, when the objective lens is focused on the medium, a tilt value used for correcting an angular deviation of the objective lens with respect to the signal layer of the medium is adjusted to When the tilt adjustment of the objective lens is performed, the jitter value is detected whenever the tilt value is changed stepwise within a predetermined range of values including the reference value of the tilt value, if necessary. And setting an optimum tilt value within approximately 20 seconds based on the difference between the maximum jitter value and the minimum jitter value in each detected jitter value. When the tilt adjustment of the objective lens is performed on the medium, the minimum jitter is set when a difference value between the maximum jitter value and the minimum jitter value is larger than a predetermined value. The disk device according to claim 23, wherein the tilt value corresponding to a value is set as the optimum tilt value. When the tilt adjustment of the objective lens is performed on the medium, the tilt value is set when a difference value between the maximum jitter value and the minimum jitter value is a small value equal to or smaller than a predetermined value. 25. The disk device according to claim 23, wherein the reference value is set as the optimum tilt value. The disk apparatus according to any one of claims 23 to 25, wherein when the tilt adjustment of the objective lens is performed on the medium, the tilt adjustment is performed within approximately 15 seconds. When the tilt adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the tilt value, and the detected jitter value is a predetermined jitter value determined in advance. The jitter value is detected each time the tilt value is changed stepwise within a numerical value within the predetermined range including the reference value of the tilt value when the value is larger than the reference value. Item 27. The disk device according to any one of Items 23 to 26. When the tilt adjustment of the objective lens is performed on the medium, the jitter value is first detected based on the reference value of the tilt value, and the detected jitter value is a predetermined jitter value determined in advance. The tilt value is not detected each time the tilt value is changed stepwise within the predetermined range of values including the reference value of the tilt value when the following small value is obtained. 28. The disk device according to claim 23, wherein the reference value is set as the optimum tilt value. When the optimum tilt value is set to the numerical value other than the reference value, the tilt value is set to the reference value when the optical pickup device performs a track jump on the medium. The disk device according to any one of claims 23 to 28. 30. The disk device according to claim 29, wherein the tilt value is returned to the numerical value other than the reference value after the track jump of the optical pickup device with respect to the medium is completed. The disk device according to any one of claims 14 to 21, and / or the disk device according to any one of claims 23 to 30, are merged. 2. The disk device according to item 1.

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