JP2008090911A - Optical disk recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device which can quickly adjust servo parameters over all the areas of the optical disk by dividing the optical disk having a plurality of recording surfaces into a plurality of concentric areas in a radial direction and adjusting the servo parameters sequentially over each divided area. <P>SOLUTION: The optical disk recording/reproducing device executes the following steps: a step for sequentially adjusting the servo parameters for all the recording surfaces of the same area from the recording surface of a front face or a rear face of the inner peripheries or outer peripheries of the divided areas; and a step for sequentially adjusting the servo parameters for all the recording surfaces of the same area after moving to the same recording surfaces as the recording surface finally adjusted when moving to the neighboring area; thereby the time required for adjusting the servo parameters can be shortened and the servo parameters can be adjusted over all the areas of the optical disk. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc recording / reproducing apparatus that handles CD, DVD, HD DVD, or the like.

  A plurality of types of recording density optical disks called CD (Compact Disc) standards and DVD (Digital Versatile Disk) standards are already widely used. In recent years, by recording information using laser light of a blue-violet wavelength, In addition, an ultra-high density optical disk HD DVD (High Density Digital Versatile Disk) with a further increased recording density has been put on the market. In addition, with the increase of high-definition programs in digital broadcasting and the expansion of the broadcasting area of digital broadcasting, a large-capacity medium capable of recording high-definition programs for a long time is required. (Rewritable) is also getting on the market.

  There are many types of optical discs such as read-only and recordable optical discs in each of the above standards, and when the optical disc recording / reproducing apparatus performs recording / reproduction, it is necessary to set parameters suitable for the characteristics of those optical discs. . Furthermore, even for the same type of optical disk, the optical disk is often not uniform over the entire surface, and the thickness, warpage, eccentricity, groove shape, recording sensitivity, etc. of the substrate vary with respect to the radial direction. In order to cope with these fluctuations, the optical disk recording / reproducing apparatus tracks servo parameters such as focus offset, tracking offset, balance, and gain so that the servo parameters become optimum values according to the fluctuations. As the recording density and recording / reproducing speed increase, the influence of these fluctuations on the recording / reproducing accuracy increases, and it is required to make the servo parameter follow the optimum value quickly over the entire surface of the optical disk.

  As a method for following the servo parameters over the entire surface of the optical disc, the following technique has been proposed (for example, see Patent Document 1).

  Prior to the reproduction of an optical disk, Patent Literature 1 divides a radial direction into a plurality of virtually concentric regions, and adjusts the focus balance of the optical pickup so that an optimal focus position is obtained in each divided virtual region. To obtain each optimum focus balance adjustment value, store the adjustment value in the adjustment value storage memory, and use the optimum focus balance adjustment value corresponding to the area where the optical pickup reproduces and scans during reproduction. ing. Further, if the adjacent area is not adjusted in focus balance, it is necessary to converge the focus balance adjustment in the unadjusted area by using the already obtained adjustment result as the initial value when starting the focus balance adjustment in the unadjusted area. It is described that the time is shortened.

In the above method, adjustment is made for each region where the focus balance is not adjusted. However, it takes time, and it is difficult to cope with high-speed recording / reproduction. In addition, DVDs, HD DVDs, etc. have multi-layer optical discs having a plurality of recording layers (recording surfaces), and these optical discs require movement between layers, so that more time is required and continuous high-speed recording / reproduction is performed. May be difficult.
JP 2000-157754 A

  Optical discs vary in substrate thickness, warpage, eccentricity, groove shape, recording sensitivity, etc. with respect to the radial direction for each optical disc. Therefore, the optical disc is divided into a plurality of concentric regions in the radial direction. It is necessary to adjust servo parameters such as offset, focus balance, track offset, and tilt correction so as to have optimum values. If an adjustment value is calculated for an unadjusted area each time, it cannot be applied to high-speed recording / reproduction. For example, each area divided before the recording / reproduction operation such as the initial operation is performed over the entire area of the optical disc. Servo parameters need to be adjusted and stored. In particular, for a multilayer optical disc, it is necessary to obtain an adjustment value at the time of initializing as described above.

  However, if the servo parameters are adjusted over the entire area of the optical disk for each divided area, there is a concern that it takes time for the initial operation. Therefore, an optical disc recording / reproducing apparatus and an adjusting method that can shorten the time are desired.

  The present invention has been made in view of the circumstances as described above, and an optical disc having a plurality of recording surfaces is divided into a plurality of concentric regions in the radial direction, and servo parameters are sequentially adjusted for each of the divided regions. An object of the present invention is to provide an optical disc recording / reproducing apparatus capable of adjusting servo parameters at high speed over the entire area of the optical disc.

  In order to achieve the above object, an optical disk recording / reproducing apparatus according to the present invention includes an objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces, and a division for receiving reflected light from the optical disk. An optical pickup having a light detector provided with a light receiving unit, signal processing means for generating a focus error signal, a tracking error signal, a push-pull signal, and a data reproduction signal from an output signal of the light detector, and the signal Servo parameter setting means for setting a servo parameter from the focus error signal, tracking error signal push-pull signal and data reproduction signal generated by the processing means and storing the set value in the storage means, the servo parameter setting means , Dividing each recording surface of the optical disc into a plurality of regions in the radial direction, When setting the servo parameters sequentially for each divided area, set the servo parameters for all recording surfaces in the same area sequentially from the recording surface on the inner or outer surface of the divided area. Then, when moving to the next adjacent area, the servo parameter is adjusted for all the recording surfaces in the same area in order by moving to the same recording surface as the last set recording surface.

  An optical disk recording / reproducing apparatus of the present invention is an optical system including an objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces, and a divided light receiving unit that receives reflected light from the optical disk. An optical pickup having a detector; signal processing means for generating a focus error signal from an output signal of the photodetector; focus offset adjusting means for adjusting a focus offset in the focus error signal; and each recording surface of the optical disc And servo parameter setting means for adjusting the focus offset by the focus offset adjusting means sequentially for each divided area and storing the adjustment value in the storage means. The parameter setting means is the inner or outer surface of the divided area. Or, adjust the focus offset for all the recording surfaces in the same area sequentially from the recording surface on the back side, and then move to the recording surface that was adjusted last when moving to the adjacent area, and then sequentially record all the recording in the same area The focus offset is adjusted for the surface.

  An optical disk recording / reproducing apparatus of the present invention is an optical system including an objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces, and a divided light receiving unit that receives reflected light from the optical disk. An optical pickup having a detector, signal processing means for generating a tracking error signal from an output signal of the photodetector, track offset adjusting means for adjusting a track offset in the tracking error signal, and each recording surface of the optical disc Servo parameter setting means for dividing each of the divided areas into a plurality of areas, adjusting the track offset by the track offset adjusting means sequentially for each divided area, and storing the adjusted value in the storage means, The parameter setting means can be used for the inner or outer surface of the divided area. Adjust the track offset for all recording surfaces in the same area sequentially from the recording surface on the back side, and then move to the same recording surface as the last adjusted recording surface when adjusting to the adjacent area. Features.

  An optical disk recording / reproducing apparatus of the present invention is an optical system including an objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces, and a divided light receiving unit that receives reflected light from the optical disk. An optical pickup having a detector; signal processing means for generating a focus error signal and a data reproduction signal from an output signal of the photodetector; a focus offset adjusting means for adjusting a focus offset in the focus error signal; and the optical disc The recording surface is divided into a plurality of areas in the radial direction, and the focus offset is adjusted by the focus offset adjusting means sequentially for each divided area, and the focus offset adjustment value that maximizes the amplitude of the data reproduction signal Servo parameter setting means for storing The servo parameter setting means adjusts the focus offset for all the recording surfaces in the same region in order from the recording surface on the front surface side or the back surface side on the inner peripheral side or outer peripheral side of the divided region, and then to the adjacent region When moving, the focus offset is adjusted for all the recording surfaces in the same area in the same recording surface as the last adjusted recording surface.

  An optical disk recording / reproducing apparatus of the present invention is an optical system including an objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces, and a divided light receiving unit that receives reflected light from the optical disk. An optical pickup having a detector; signal processing means for generating a focus error signal and a push-pull signal from an output signal of the photodetector; focus offset adjusting means for adjusting a focus offset in the focus error signal; and the optical disc The recording surface is divided into a plurality of regions in the radial direction, and the focus offset is adjusted by the focus offset adjusting means sequentially for each divided region, and the focus offset adjustment value that maximizes the amplitude of the push-pull signal Servo parameter setting means for storing in the storage means; The servo parameter setting means adjusts the focus offset for all the recording surfaces in the same region sequentially from the recording surface on the front surface side or back surface side on the inner peripheral side or outer peripheral side of the divided region, and then adjacent When moving to an area, the recording surface is moved to the same recording surface as the last adjusted recording surface, and the focus offset is adjusted for all the recording surfaces in the same area sequentially.

  An optical disc recording / reproducing apparatus according to the present invention includes an objective lens for condensing laser light on a recording surface of an optical disc having a plurality of recording surfaces, and an inclination of the recording surface of the optical disc with respect to the optical axis of the laser light. An optical pickup having a tilt mechanism for tilting the objective lens, and a photodetector having a divided light receiving unit for receiving reflected light from the optical disc, and generating a data reproduction signal from the output signal of the photodetector Signal processing means, tilt control means for controlling the tilt mechanism according to the signal amplitude of the data reproduction signal, and each recording surface of the optical disc is divided into a plurality of areas in the radial direction, and each divided area is divided The tilt mechanism is adjusted sequentially by the tilt control means every time, and the adjustment value of the tilt mechanism that maximizes the amplitude of the data reproduction signal is stored in the storage means. Servo parameter setting means for storing, and the servo parameter setting means includes a tilt mechanism for all the recording surfaces in the same region in order from the recording surface on the front side or back side on the inner peripheral side or outer peripheral side of the divided region. Then, when moving to an adjacent area, the tilting mechanism is adjusted for all the recording surfaces in the same area sequentially by moving to the same recording surface as the last adjusted recording surface.

  An optical disc recording / reproducing apparatus according to the present invention includes an objective lens for condensing laser light on a recording surface of an optical disc having a plurality of recording surfaces, and an inclination of the recording surface of the optical disc with respect to the optical axis of the laser light. An optical pickup having a tilt mechanism for tilting the objective lens, and a photodetector having a divided light receiving unit for receiving reflected light from the optical disc, and generating a data reproduction signal from the output signal of the photodetector Signal processing means, tilt control means for controlling the tilt mechanism according to the signal amplitude of the data reproduction signal, and each recording surface of the optical disc is divided into a plurality of areas in the radial direction, and each divided area is divided The tilt mechanism is adjusted by the tilt control unit every time, and the adjustment value of the tilt mechanism that maximizes the amplitude of the data reproduction signal is stored in the storage unit. Servo parameter setting means for adjusting the tilt mechanism for each divided area of one recording surface and storing the adjustment value of the tilt mechanism that maximizes the amplitude of the data reproduction signal. The adjustment value of the other recording surface is stored in the means, and the adjustment value of the same area of the recording surface that has already been adjusted is a value obtained by adding a predetermined value or multiplying by a predetermined count.

  According to the present invention, since servo parameters can be adjusted at high speed over the entire area of the optical disc, information can be recorded or reproduced in an optimum state for the optical disc, and the startup time can be shortened. be able to.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of an optical disc recording / reproducing apparatus 1 to which the present invention is applied. The optical disc 2 is an optical disc capable of recording user data such as a DVD-RAM. Land tracks and group tracks are formed in a spiral shape on the surface of the optical disc 2, and the optical disc 2 is driven to rotate by a disc motor 3. The disk motor 3 is controlled by a disk motor control circuit 4.

  Information recording and reproduction with respect to the optical disc 2 are performed by the optical pickup 5. The optical pickup 5 is provided with an objective lens 6 that is movably supported by a wire or a leaf spring (not shown). The objective lens 6 is driven by a focus direction drive coil 7 in a focusing direction (the optical axis direction of the lens). Further, it is possible to move in the tracking direction (direction orthogonal to the optical axis of the lens) by driving the track direction drive coil 8.

  The modulation circuit 9 modulates user data supplied from the host device 28 via the interface circuit 27 during information recording, and provides the modulated recording data to the laser control circuit 10. The modulation method is, for example, 8-16 modulation in the case of a DVD system, and EFM modulation in the case of a CD system. The laser control circuit 10 supplies a write signal to the semiconductor laser diode 11 in the optical pickup 5 based on the modulated recording data supplied from the modulation circuit 9 when information is recorded on the optical disc 2 (at the time of mark formation). To do.

  The semiconductor laser diode 11 generates laser light in accordance with a signal supplied from the laser control circuit 10. Laser light emitted from the semiconductor laser diode 11 is irradiated onto the recording surface of the optical disc 2 through the optical system component 12 and the objective lens 6. The reflected light from the optical disk 2 passes through the objective lens 6 and the optical system component 12 and is guided to the photodetector 13 in the optical pickup 5. An output signal from the photodetector 13 is supplied to the signal processing circuit 14.

  The signal processing circuit 14 generates a focus error signal (FE signal) and outputs it to the focusing control circuit 15. The focusing control circuit 15 generates a focusing control signal, is supplied to the focus direction drive coil 7 of the optical pickup 5, and controls the objective lens 10 so that the laser light is always just focused on the recording surface of the optical disc 2. The The focusing control circuit 15 has a function of focus offset adjusting means 15a for adjusting the focus offset in the FE signal.

  Further, the signal processing circuit 14 generates a tracking error signal (TE signal) and outputs it to the tracking control circuit 16. The tracking control circuit 16 generates a tracking control signal and is supplied to the track direction drive coil 8 of the optical pickup 5 to control the objective lens 10 so that the laser light follows the track on the recording surface of the optical disc 2. . The tracking control circuit 16 has a function of track offset adjusting means 16a for adjusting the track offset in the TE signal. Further, the signal processing circuit 14 supplies a push-pull signal (PP signal) to the tracking control circuit 16.

  The signal of the tracking control circuit 16 is supplied to the sled motor control circuit 17. When the objective lens 6 is controlled by the tracking control circuit 16, the thread motor 18, that is, the optical disk 2 of the optical pickup 5 is positioned so that the objective lens 6 is positioned near the center position in the optical pickup 5 by the thread motor control circuit 17. Radial movement is controlled.

  The signal processing circuit 14 generates a data reproduction signal (RF signal) from the output signal of the photodetector 13 and outputs it to the data reproduction circuit 19. The data reproduction circuit 19 demodulates the recording data based on the reproduction clock signal from the PLL circuit 20. The reproduction data demodulated by the data reproduction circuit 19 is error-corrected by an error correction circuit (not shown) using the assigned error correction code, and then output to the host device 28 via the interface circuit 27. The signal processing circuit 14 has a function as signal processing means.

  When the recording surface of the optical disc 2 is inclined with respect to the optical axis of the laser beam passing through the objective lens 6 of the optical pickup 5 due to warpage or surface wobbling of the optical disc 2, it is generated from the output signal of the photodetector 13. The size of the data reproduction signal (RF signal) or push-pull signal (PP signal) to be reduced becomes relatively large, and noise increases relatively, causing an increase in jitter. In order to avoid this, a tilt mechanism 21 for adjusting the tilt of the objective lens 6 is provided. The tilt mechanism 21 is mounted on the optical pickup 5.

  The tilt control circuit 22 has a function of controlling the tilt mechanism 21 according to the magnitude of the RF signal obtained from the signal processing circuit 14 and tilting the optical axis of the objective lens to an appropriate value with respect to the tilt of the recording surface of the optical disc 2.

  The disk motor control circuit 4, thread motor control circuit 17, modulation circuit 9, laser control circuit 10, focusing control circuit 15, tracking control circuit 16, data reproduction circuit 19, PLL circuit 20, tilt control circuit 22 and the like are servo control circuits. These circuits are controlled by a CPU (Central Processing Unit) 24 via a bus 23.

  The CPU 24 comprehensively controls the optical disc recording / reproducing apparatus 1 in accordance with an operation command supplied from the host device 28 via the interface circuit 27. The CPU 24 uses a RAM (Random Access Memory) 25 as a work area such as a buffer memory at the time of recording and reproduction, and performs predetermined control according to a program stored in a ROM (Read Only Memory) 26.

  The CPU 24 has at least the function of the servo parameter setting means 24a in realizing the servo parameter adjustment at high speed over the entire area of the optical disk having a plurality of recording surfaces. This means uses the required work area of the RAM 25 as a temporary storage location for data. The servo parameter setting unit 24a divides each recording surface of the optical disc having a plurality of recording surfaces into a plurality of concentric regions in the radial direction, and sequentially adjusts the servo parameters for each region for each of the divided regions. It has a function of adjusting servo parameters at high speed over a region.

  Servo parameters such as focus offset, focus balance, track offset, and tilt correction are optimized for each recording surface and each divided area so that the amplitude value of the RF signal and the amplitude value of the PP signal are maximized. The value is found and stored in the RAM 25 as a storage means. When a certain area is accessed in the recording / reproducing operation, the servo parameter in that area is read, and recording / reproducing is performed under optimum conditions.

  The servo parameter setting unit 24a controls and adjusts the focus offset adjusting unit 15a for the focus offset, the track offset adjusting unit 16a for the track offset, and the tilt control circuit 22 for the tilt adjustment.

  FIG. 2 is a diagram schematically showing an adjustment order of servo parameter adjustment of the optical disc 2 having a plurality of recording surfaces. FIG. 2 shows a multilayer optical disk having, for example, three recording surfaces (three layers). Reference numeral 30 denotes a center hole, and 31a, 31b, and 31c are recording surfaces. 31a is a first recording surface, 31b is a second recording surface, and 31c is a third recording surface. The surface side, the surface facing the objective lens 6 is the front surface side, and the opposite surface is the back surface side. FIG. 2 shows a state of being divided into, for example, five areas. From the inner peripheral region, 32a is defined as a first region, 32b as a second region, 32c as a third region, 32d as a fourth region, and 32d as a fifth region.

  The arrows in FIG. 2 indicate the order in which the servo parameter setting unit 24a adjusts the servo parameters of each recording surface in the divided area. In this example, the servo parameter of the recording surface of the first divided area 32a of the first recording surface 31c is first adjusted, and when the adjustment is completed, the servo parameter of the recording surface of the second divided area 32b of the first recording surface 31c is then adjusted. Represents adjusting. In this example, the next of the fifth divided area 32d of the first recording surface 31c has moved to the first divided area 32a of the second recording surface 31b, and the next of the fifth divided area 32d of the second recording surface 31b is the second. The third recording surface 31c has moved to the first division area 32a.

  In the above adjustment sequence, in order to adjust all the recording surfaces and recording areas, the movement to the adjacent divided area is 12 times, and the movement from the fifth divided area 32d to the first divided area 32a is twice. included. In particular, the movement of the first recording surface 31a from the fifth divided region 32d to the first divided region 32a of the second recording surface 31b and the fifth divided region 32d of the second recording surface 31b are next to the third recording surface 31c. The movement to the first divided area 32a takes time due to an access operation with a long distance from the outer peripheral side to the inner peripheral side of the optical disc.

  For example, when the recording surface is divided into approximately equal parts, the moving distance to the adjacent divided area is about 7 mm (millimeters), and the moving time of the optical pickup 5 requires about 100 ms (milliseconds). The movement from the fifth divided area 32d to the first divided area 32a requires 300 ms. Therefore, 100 × 12 + 300 × 2 = 1800, that is, 1.8 s (seconds) is required. The adjustment of the servo parameters is executed in the initial operation after the optical disc 2 is loaded in the optical disc recording / reproducing apparatus, but it is desirable to shorten the time of the initial operation as much as possible.

  FIG. 3 is a diagram schematically showing another example of the adjustment order of servo parameter adjustment of the optical disc 2 having a plurality of recording surfaces. The configuration of the optical disc 2 is the same as that shown in FIG. As in FIG. 2, the arrows indicate the order in which the servo parameter setting unit 24a adjusts the servo parameters of the recording surfaces in the divided areas. In the example of FIG. 3, first, the servo parameters of the recording surface of the first divided area 32a of the first recording surface 31a are adjusted, and when the adjustment is completed, the recording surface of the first divided area 32a of the second recording surface 31b is then adjusted. This indicates that the servo parameters are adjusted. When the adjustment of the recording surface of the first divided area 32a of the third recording surface 31c is completed, the recording surface moves to the recording surface of the second divided area 32b of the third recording surface 31c. Next, the recording surface moves to the recording surface of the second divided area 32b of the second recording surface 31b. When moving between areas, it moves to an adjacent area on the same recording surface.

  In the above adjustment sequence, in order to adjust all the recording surfaces and recording areas, the movement to the adjacent divided area is included four times and the movement to the adjacent recording surface is included ten times. As described above, it takes about 100 ms to move to adjacent divided areas. On the other hand, the movement time to the adjacent recording surface is about 20 ms. Therefore, 100 × 4 + 20 × 10 = 600, that is, 0.6 s is required. Compared with the adjustment sequence shown in FIG. 2, it can be shortened by 1.2 s. The movement between the adjacent divided areas and the movement from the outer circumference to the inner circumference is accompanied by the movement of the optical pickup 5, so that there is a high possibility that an access retry will occur. In the adjustment sequence shown in FIG. 3, there is no movement from the outer circumference to the inner circumference, and there is little movement between adjacent divided areas, so the possibility of time extension caused by access retry is small.

  In FIG. 3, the processing starts from the first recording surface 31a on the front surface side of the first divided region 32a on the inner peripheral side, but may start from the third recording surface 31c on the back surface side of the first divided region 32a. Alternatively, it may start from the first recording surface 31a on the front surface side of the fifth divided region 32d on the outer peripheral side, or may start from the third recording surface 31c on the back surface side of the fifth divided region 32d. What is necessary is just to start from a place convenient for the position of the optical pickup when the process before the servo parameter adjustment is completed and other conditions.

  As described above, the servo parameters are adjusted for all the recording surfaces in the same area sequentially from the recording surface on the inner or outer surface side of the divided area, and the last time when moving to the adjacent area. By moving to the same recording surface as the recording surface adjusted in the above and adjusting the servo parameters for all the recording surfaces in the same area sequentially, the time required for adjusting the servo parameters can be shortened, and the entire area of the optical disk can be reduced. Servo parameters can be adjusted at high speed.

  FIG. 4 is a diagram schematically showing an example of the adjustment order in the tilt adjustment of the warped optical disc 2. The configuration of the optical disc 2 is the same as the configuration shown in FIG. 3, and the order of tilt adjustment is the same as the sequence described in FIG. In the tilt adjustment, when the recording surface of the optical disc 2 is tilted due to warpage of the optical disc 2 with respect to the optical axis of the laser beam passing through the objective lens 6 of the optical pickup 5, the RF signal and PP signal amplitudes are reduced. Therefore, in order to avoid this, the tilt of the objective lens is adjusted by adjusting the tilt mechanism to obtain an optimum adjustment value. As shown in FIG. 4, the tilt of the recording surface of the optical disk having a plurality of recording surfaces is obtained. If the radial positions are the same, almost the same inclination is shown. That is, for example, the inclination value of the first recording surface of the fourth divided area 32d and the inclination of the second recording surface 31b and the third recording surface 31c of the fourth divided area 32d are substantially the same.

  FIG. 5 is a diagram schematically illustrating another example of the adjustment order in the tilt adjustment of the warped optical disc 2. As described above, the inclination of the recording surface of the optical disc having a plurality of recording surfaces exhibits almost the same inclination as long as the radial position is the same. Therefore, in the tilt adjustment of the servo parameter adjustment, the tilt adjustment value of each divided area is obtained for one of the plurality of recording surfaces, and the other recording surface is the same area of the already adjusted recording surface. A value obtained by adding a predetermined value to the adjustment value or multiplying by a predetermined count can be used. The white arrow in FIG. 5 schematically shows that the tilt adjustment is calculated by calculation.

  In the example of FIG. 5, the tilt adjustment is first performed on the first divided area 32a of the first recording surface 31a, then the second divided area 32b of the first recording surface 31a is adjusted, and the adjustment is sequentially performed up to the fifth divided area. The tilt adjustment value is stored in the RAM 25. Next, the first divided area 32a of the second recording surface 31b is calculated by adding a predetermined value to the adjustment value of the first divided area 32a of the first recording surface 31a and stored in the RAM 25.

  For example, when the predetermined value indicating the difference between the first recording surface and the second recording surface is 2 minutes, when the adjustment value of the first divided area 32a of the first recording surface 31a is 1 minute, the second recording The adjustment value of the first divided region 32a of the surface 31b is 1 + 2 = 3 minutes. Similarly, when the adjustment value of the fifth divided area 32d of the first recording surface 31a is, for example, 40 minutes, the fifth divided area 32d of the second recording surface 31b can be set to 40 + 2 = 42 minutes. Further, when the predetermined value indicating the difference between the first recording surface and the third recording surface is 4 minutes, the adjustment value of the first divided area 32a of the third recording surface 31c is set to 1 + 4 = 5 minutes. Similarly, the fifth divided area 32d of the third recording surface 31c can be 40 + 4 = 44 minutes.

  The predetermined value indicating the difference between the first recording surface and the second recording surface is a predetermined value determined by the distance from the surface of the optical disc 2 to the recording surface and other factors. The predetermined value may be separately investigated before tilt servo parameter adjustment and stored in the RAM 25, read out during servo parameter adjustment, or stored in the ROM 26 at factory shipment.

  As described above, the tilt mechanism is adjusted for each divided area of one recording surface, the adjustment value of the tilt mechanism that maximizes the RF amplitude is stored in the RAM 25, and the adjustment values of the other recording surfaces are already adjusted. By adding a predetermined value to the adjustment value of the same area of the surface or multiplying the adjustment value by a predetermined count, it is possible to shorten the servo parameter adjustment time for tilt adjustment.

1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus 1 to which the present invention is applied. The figure which represented the adjustment order of servo parameter adjustment typically. Diagram showing another example of adjustment order of servo parameter adjustment The figure which represented typically the example of the adjustment order in tilt adjustment. The figure which represented typically another example of the adjustment order in tilt adjustment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk recording / reproducing apparatus 2 Optical disk 5 Optical pick-up 6 Objective lens 13 Photo detector 14 Signal processing circuit 15 Focusing control circuit 15a Focus offset adjusting means 16 Tracking control circuit 16a Track offset adjusting means 21 Tilt mechanism 22 Tilt control circuit 24 CPU
24a Servo parameter setting means 25 RAM
26 ROM
27 Interface circuit 28 Host device

Claims (7)

An optical pickup having an objective lens for condensing a laser beam on a recording surface of an optical disc having a plurality of recording surfaces and a photodetector having a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a focus error signal, a tracking error signal, a push-pull signal, and a data reproduction signal from the output signal of the photodetector;
Servo parameter setting means for setting a servo parameter from the focus error signal, tracking error signal push-pull signal and data reproduction signal generated by the signal processing means and storing the set value in the storage means;
The servo parameter setting means divides each recording surface of the optical disc into a plurality of areas in the radial direction, and sets the servo parameters sequentially for each divided area when the divided area has an inner circumference side or an outer circumference side. Set the servo parameters for all the recording surfaces in the same area sequentially from the recording surface on the front or back side, and when moving to the next adjacent area, move to the same recording surface as the last set recording surface An optical disc recording / reproducing apparatus characterized by adjusting servo parameters for all recording surfaces. An optical pickup having an objective lens for condensing a laser beam on a recording surface of an optical disc having a plurality of recording surfaces and a photodetector having a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a focus error signal from the output signal of the photodetector;
A focus offset adjusting means for adjusting a focus offset in the focus error signal;
Servo parameter setting means for dividing each recording surface of the optical disc into a plurality of areas in the radial direction, adjusting the focus offset by the focus offset adjusting means sequentially for each divided area, and storing the adjustment value in the storage means; Have
The servo parameter setting means adjusts the focus offset for all the recording surfaces in the same region sequentially from the recording surface on the front surface side or the back surface side on the inner peripheral side or outer peripheral side of the divided region, and then moves to the adjacent region An optical disc recording / reproducing apparatus characterized in that the focus offset is adjusted for all the recording surfaces in the same area in order, moving to the same recording surface as the last adjusted recording surface. An optical pickup having an objective lens for condensing a laser beam on a recording surface of an optical disc having a plurality of recording surfaces and a photodetector having a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a tracking error signal from the output signal of the photodetector;
Track offset adjusting means for adjusting the track offset in the tracking error signal;
Servo parameter setting means for dividing each recording surface of the optical disc into a plurality of areas in the radial direction, adjusting the track offset by the track offset adjusting means for each divided area, and storing the adjustment value in the storage means; Have
The servo parameter setting means adjusts the track offset for all the recording surfaces in the same region sequentially from the recording surface on the inner or outer peripheral side of the divided region, and then moves to the adjacent region. An optical disk recording / reproducing apparatus characterized in that the track offset is adjusted by moving to the same recording surface as the last adjusted recording surface. An optical pickup having an objective lens for condensing a laser beam on a recording surface of an optical disc having a plurality of recording surfaces and a photodetector having a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a focus error signal and a data reproduction signal from the output signal of the photodetector;
A focus offset adjusting means for adjusting a focus offset in the focus error signal;
Each recording surface of the optical disc is divided into a plurality of regions in the radial direction, and the focus offset is adjusted by the focus offset adjusting unit sequentially for each divided region, and the focus offset of which the amplitude of the data reproduction signal is maximized is adjusted. Servo parameter setting means for storing the adjustment value in the storage means,
The servo parameter setting means adjusts the focus offset for all the recording surfaces in the same region sequentially from the recording surface on the front surface side or the back surface side on the inner peripheral side or outer peripheral side of the divided region, and then moves to the adjacent region An optical disk recording / reproducing apparatus characterized in that the focus offset is adjusted for all the recording surfaces in the same area in order, moving to the same recording surface as the last adjusted recording surface. An optical pickup having an objective lens for condensing a laser beam on a recording surface of an optical disc having a plurality of recording surfaces and a photodetector having a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a focus error signal and a push-pull signal from the output signal of the photodetector;
A focus offset adjusting means for adjusting a focus offset in the focus error signal;
Each recording surface of the optical disc is divided into a plurality of regions in the radial direction, and the focus offset is adjusted by the focus offset adjusting unit sequentially for each divided region, and the focus offset of which the amplitude of the push-pull signal is maximized is adjusted. Servo parameter setting means for storing the adjustment value in the storage means,
The servo parameter setting means adjusts the focus offset for all the recording surfaces in the same region sequentially from the recording surface on the front surface side or the back surface side on the inner peripheral side or outer peripheral side of the divided region, and then moves to the adjacent region An optical disc recording / reproducing apparatus characterized in that the focus offset is adjusted for all the recording surfaces in the same area in order, moving to the same recording surface as the last adjusted recording surface. An objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces; and a tilt mechanism for inclining the objective lens in accordance with the inclination of the recording surface of the optical disk with respect to the optical axis of the laser light; An optical pickup having a photodetector with a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a data reproduction signal from the output signal of the photodetector;
Tilt control means for controlling the tilt mechanism according to the signal amplitude of the data reproduction signal;
The recording surface of the optical disc is divided into a plurality of regions in the radial direction, and the tilt mechanism is adjusted by the tilt control means for each divided region in order to adjust the tilt mechanism that maximizes the amplitude of the data reproduction signal. Servo parameter setting means for storing values in the storage means,
The servo parameter setting means adjusts the tilt mechanism for all the recording surfaces in the same region sequentially from the recording surface on the front surface side or the back surface side on the inner peripheral side or outer peripheral side of the divided region, and then moves to the adjacent region. An optical disk recording / reproducing apparatus characterized in that the tilt mechanism is adjusted for all the recording surfaces in the same region in order, moving to the same recording surface as the last adjusted recording surface. An objective lens for condensing laser light on a recording surface of an optical disk having a plurality of recording surfaces; and a tilt mechanism for inclining the objective lens in accordance with the inclination of the recording surface of the optical disk with respect to the optical axis of the laser light; An optical pickup having a photodetector with a divided light receiving portion for receiving reflected light from the optical disc;
Signal processing means for generating a data reproduction signal from the output signal of the photodetector;
Tilt control means for controlling the tilt mechanism according to the signal amplitude of the data reproduction signal;
The recording surface of the optical disc is divided into a plurality of regions in the radial direction, the tilt mechanism is adjusted by the tilt control means for each divided region, and the adjustment value of the tilt mechanism that maximizes the amplitude of the data reproduction signal Servo parameter setting means for storing in the storage means,
The servo parameter setting means adjusts the tilt mechanism for each divided area of one recording surface and stores the adjustment value of the tilt mechanism that maximizes the amplitude of the data reproduction signal in the storage means. An optical disc recording / reproducing apparatus characterized in that the adjustment value is a value obtained by adding a predetermined value to the adjustment value of the same area of the recording surface that has already been adjusted or by multiplying a predetermined count.

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