JP2006252691A - Optical disk device control method and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of calculating a tracking error signal for optimal tracking servo according to the recording or reproducing position of an optical disk surface and preventing the shifting of the tracking servo controlled on the basis of the tracking error signal, and its control method. <P>SOLUTION: The control method of the optical disk device being the tracking error signal calculation method of the optical device for performing tracking control by using a tracking error signal is characterized in that a relational equation for calculating the tracking error signal is changed according to the recording or reproducing position of an optical disk surface (S3 to S6). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of controlling an optical disc apparatus that performs at least one of recording and reproduction of information on an optical disc, and an optical disc apparatus.

  Optical disc devices such as audio CDs, CD-ROMs, CD-R / RWs, and DVDs (Digital Versatile Disks) have already been put into practical use, and are actively developed for various applications and high performance. Has been done. Particularly recently, along with the rapid market expansion of personal computers, the penetration rate of built-in optical disk devices in personal computers has increased.

  Here, the configuration of the optical disc apparatus will be described with reference to FIG.

  FIG. 5 is a block diagram of a conventional optical disc apparatus. In FIG. 5, 1 is an optical disk, 2 is a pickup module, 3 is a spindle motor, 4 is a tracking drive coil, 5 is an objective lens, 6 is a reflected light receiving means, 7 is a tracking error signal calculating means, and 8 is a tracking servo control means. , 9 is a tracking drive voltage supply means, and 12 is a digital servo controller.

  The operation of the conventional optical disc apparatus configured as described above will be described.

  The pickup module 2 includes a spindle motor 3 that rotates the optical disc 1, an optical pickup that performs at least one of reading and writing information signals on the optical disc 1 using a laser emission pattern, and a carriage on which the optical pickup is mounted. And a feed unit for moving the optical disk 1 in the radial direction.

  The tracking error signal calculation means 7 calculates a tracking error signal based on the signal output from the reflected light receiving means 6 inside the optical pickup in the carriage provided inside the pickup module 2, and Is output to the tracking servo control means 8. The tracking error signal is a signal including positional deviation information in the radial direction of the optical disc 1 between the light beam spot and the information track of the optical disc 1. The tracking error signal calculation means 7 takes out the tracking error signal and outputs it to the tracking servo control means 8. The tracking servo control means 8 outputs a signal for controlling the positional relationship between the information track and the light beam to the tracking drive voltage supply means 9 using the tracking error signal.

  The tracking drive voltage supply means 9 generates an output voltage for moving the tracking drive coil 4 based on the obtained tracking error signal, and outputs the output voltage to move the tracking drive coil 4 and is provided in the optical pickup. The objective lens 5 is moved. In this way, by moving the objective lens 5, the light beam spot can follow the information track of the optical disk 1.

  The tracking servo control means 8 is composed of an ON / OFF circuit, an arithmetic circuit, a filter circuit, an amplifier circuit, etc., and performs tracking control of the objective lens 5 so that the light beam spot follows the information track of the optical disc 1, and further tracking error Using the low-frequency component of the signal, feed control is performed so that the objective lens 5 maintains a substantially neutral position.

  The feed unit (not shown) is composed of a feed motor, a gear, a screw shaft, and the like, and the carriage moves by rotating the feed motor so that feed motor pulses are periodically output from the feed motor. It has become. The digital servo controller 12 receives signals sent from the tracking drive coil 4, reflected light receiving means 6, tracking error signal calculation means 7, tracking drive voltage supply means 9, and feed section (not shown). A signal calculation process or the like is performed, the result (signal) of this calculation process is sent to each part, and each part is driven and processed to control each part.

  On the other hand, a pre-groove (guide groove) is formed in the recording type optical disc 1 during the manufacturing process. This pregroove forms a wobble while meandering in a specific frequency range, and the address information of the disk is modulated and recorded. By using these pieces of information, rotation control of the spindle motor and position information on the surface of the optical disc 1 can be obtained.

  In the optical disc 1 such as DVD-RW or DVD + RW, the groove depth provided in the optical disc 1 is very shallow, 1 / 8λ to 1 / 12λ, and therefore, it is generated from one beam based on the diffracted light due to the difference in groove depth. The signal calculated by the tracking error signal calculation method called the Push-Pull method (hereinafter referred to as the PP method) becomes a small signal, and an offset occurs in the tracking error signal due to a scratch or a boundary between a recorded area and an unrecorded area. There is a problem that the tracking servo comes off. Therefore, in order to solve the above-described problem, a tracking error signal calculation method called an Advanced Push-Pull method (hereinafter, APP method) has been established.

  Next, a tracking error signal calculation method for DVD will be described.

  FIG. 6 is a polarization hologram division pattern diagram for DVD.

The division pattern of the polarization hologram for DVD used for calculating the tracking error signal is divided into two equal parts by a line parallel to the traveling direction of the objective lens 5 provided in the optical pickup, and further to the traveling direction of the optical pickup. The regions A to D, which are bisected by vertical lines, are divided into regions A and C, regions B and D diagonally, and regions A and D, regions B and C, respectively. When the region α and the region β are provided so as to straddle, and the region α and the region β are defined to be substantially parallel to the traveling direction of the optical pickup, the tracking error signal calculation method in the PP method includes the region α and the region β. A relational expression for calculating the tracking error signal TE in a state of being included in each of the areas A to D,
TE = (A + D) − (B + C) (Formula 1)
It is said. Further, in the tracking error signal calculation method in the APP method, a relational expression for calculating the tracking error signal TE in a state where the regions A to D, the region α, and the region β exist is:
TE = {(A + D) − (B + C)} − K (β−α) (Equation 2)
It is said. Here, K is a fixed value set in each optical disk device, and is set to the same constant over the entire circumference of the optical disk 1.

  In the tracking error signal calculation method in the APP method, (A + D) − (B + C), which is the first half of (Equation 2), is the same as in the conventional PP method, and the regions α and β divided by the slits have opposite polarities. Since the PP method is established, the DC offset is theoretically completely removed when K = 1. Here, K is a parameter which is divided by the slit and indicates the degree of influence of the PP method having the reverse polarity.

  Therefore, it is possible to remove the offset of the tracking error signal generated at the boundary between the recorded area and the unrecorded area on the optical disc 1 which has been a problem in the past.

As a prior example, there is (Patent Document 1) and the like.
JP-A-11-353666

  However, in the above-described conventional configuration, if the amount of light incident on the region α and the region β divided by the slit becomes non-uniform due to factors such as scratches existing on the optical disc 1, the calculation formula for the tracking error signal in the APP method is used. A new offset in which a large reverse polarity offset occurs in the K (β-α) portion of (Equation 2), and the effect increases when the K value is increased, and tracking is lost at the scratched portion. Challenges arise.

  The present invention solves such a conventional problem, and an optimal tracking error signal for tracking servo can be calculated according to the recording or reproducing position on the surface of the optical disk 1. It is an object of the present invention to provide an optical disc device control method and an optical disc device that can avoid the tracking servo controlled based on the deviation.

  The present invention has been made to solve the above problems, and is a tracking error signal calculation method for an optical disc apparatus that performs tracking control using a tracking error signal, and a relational expression for calculating a tracking error signal is: It is a control method of an optical disc apparatus, which is changed according to a recording or reproducing position on the surface of the optical disc.

  The optical disk apparatus according to the present invention includes an optical pickup that records and / or reproduces data using a laser emission pattern, reflected light receiving means for receiving reflected light from the optical disk, and tracking from the received signal. A tracking error signal calculating means for calculating an error signal, a tracking servo control means for generating a lens position signal from the tracking error signal, a tracking drive voltage supply means for driving the tracking drive coil based on the lens position signal, and a tracking drive coil A movable objective lens and a control unit that controls calculation of a tracking error signal are provided, and the control unit changes a relational expression for calculating a tracking error signal according to a recording or reproducing position on an optical disk surface. With an optical disk device That.

  In the present invention, the relational expression for calculating the tracking error signal is changed according to the recording or reproducing position on the optical disk surface, so that the recording area or the recording area with many recorded / unrecorded boundary areas on the optical disk can be obtained.・ A tracking error signal can be calculated according to each of the areas with few unrecorded boundary areas, and a tracking error signal corresponding to an area where many scratches are expected to occur when using an optical disc. It is possible to calculate a tracking error signal according to a recording situation on the optical disk surface or a malfunction that is expected to occur when the optical disk is used.

  As a result, it is possible to calculate an optimal tracking servo tracking error signal depending on the position at which recording or reproduction is performed on the optical disk surface, and to prevent the tracking servo controlled based on the tracking error signal from being lost. An optical disc device and a control method thereof can be realized.

  The invention according to claim 1 is a tracking error signal calculation method for an optical disc apparatus that performs tracking control using a tracking error signal, wherein the relational expression for calculating the tracking error signal is a position at which recording or reproduction is performed on the optical disc surface. It is characterized by being changed by. Tracking according to the recording situation on the optical disk surface and the trouble that is expected to occur when using the optical disk, by changing the relational expression to calculate the tracking error signal depending on the position to be recorded or reproduced on the optical disk surface An error signal can be calculated.

  As a result, it is possible to calculate an optimal tracking servo tracking error signal depending on the position at which recording or reproduction is performed on the optical disk surface, and to prevent the tracking servo controlled based on the tracking error signal from being lost. It is possible to realize a control method of an optical disc device that can be used.

  The invention according to claim 2 is characterized in that the relational expression for calculating the tracking error signal is changed depending on the position of the optical disk in the radial direction. The tracking error signal is calculated according to the region where many scratches are expected to occur when the optical disk is used by changing the relational expression for calculating the tracking error signal according to the radial position of the optical disk. Can do.

  In the invention according to claim 3, the division pattern of the polarization hologram for DVD used for calculating the tracking error signal is divided into two equal parts by a line parallel to the traveling direction of the optical pickup, and further to the traveling direction of the optical pickup. Regions A to D, which are divided into two equal parts by vertical lines, region A and region C, region B and region D are diagonal, and region A and region D and region B When a region α and a region β are newly provided so as to straddle the region C, and the regions α and β are defined to be substantially parallel to the traveling direction of the optical pickup, the relational expression for calculating the tracking error signal TE is TE = {(A + D) − (B + C)} − K (β−α), and by changing K, the relational expression for calculating the tracking error signal is changed.

  By using the APP method (Advanced Push-Pull method) at the same time that the relational expression for calculating the tracking error signal is changed according to the recording or reproducing position on the optical disk surface, the tracking error generating signal Since the ratio of {(A + D)-(B + C)}, which is the main beam amount portion, and (β-α), which is the sub beam amount portion, can be set separately by setting the K value, the tracking error signal calculation method is applied to the optical disc. It can be easily changed depending on the recording or reproducing position on the screen.

  The invention described in claim 4 is a constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α), and is a region provided on the outer peripheral side in the radial direction of the optical disk. The K value used for is smaller than the K value used for the area provided on the inner peripheral side in the radial direction of the optical disc. When the optical disk is used, the K value used for the area provided on the outer peripheral side in the radial direction of the optical disk is smaller than the K value used for the area provided on the inner peripheral side in the radial direction of the optical disk. It is possible to calculate a tracking error signal corresponding to the outer peripheral side region of the optical disk where many scratches are expected to occur.

  The invention according to claim 5 is a constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α), and is a disc information management area of the optical disc or a trial writing area of the disc. The K value used in at least one of the above is larger than the K value used in the user data area. A recording area in which there are many recorded / unrecorded boundary areas on the optical disk, because the K value used in at least one of the disk management area or the trial writing area of the optical disk is larger than the K value used in the user data area Alternatively, it is possible to calculate a tracking error signal corresponding to each of the areas with few recorded / unrecorded boundary areas.

  According to the sixth aspect of the present invention, the determination of the constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α) is performed at a recording / unrecording boundary in the disk information management area. A K value at which the tracking servo is removed is acquired in advance, and all or part of the K value used for the optical disc is determined based on the K value. The determination of the constant K used in the above relational expression obtains in advance a K value at which the tracking servo is released at the recording / unrecording boundary in the disc management area, and based on the K value, all or one of the K values used for the optical disc is obtained. By determining the unit, it is possible to calculate the tracking error signal corresponding to the recording condition on the optical disk surface and the trouble that is expected to occur when using the optical disk, corresponding to the variation due to the combination of the optical disk device and the optical disk. it can.

  According to a seventh aspect of the present invention, there is provided an optical pickup that records and / or reproduces data using a laser emission pattern, reflected light receiving means for receiving reflected light from an optical disk, and tracking error from the received signal. Tracking error signal calculation means for calculating a signal, tracking servo control means for generating a lens position signal from the tracking error signal, tracking drive voltage supply means for driving the tracking drive coil based on the lens position signal, and movable by the tracking drive coil And a control unit that controls the calculation of the tracking error signal, and the control unit changes a relational expression for calculating the tracking error signal depending on a recording or reproducing position on the optical disk surface. Is. When the control unit changes the relational expression for calculating the tracking error signal according to the recording or reproducing position on the optical disk surface, the recording status on the optical disk surface or a problem that is expected to occur when the optical disk is used A corresponding tracking error signal can be calculated. As a result, it is possible to calculate an optimal tracking servo tracking error signal depending on the position at which recording or reproduction is performed on the optical disk surface, and to prevent the tracking servo controlled based on the tracking error signal from being lost. An optical disc device that can be used can be realized.

  According to an eighth aspect of the present invention, there is provided an optical pickup that records and / or reproduces data using a laser emission pattern, reflected light receiving means for receiving reflected light from an optical disk, and tracking error from the received signal. Tracking error signal calculation means for calculating a signal, tracking servo control means for generating a lens position signal from the tracking error signal, tracking drive voltage supply means for driving the tracking drive coil based on the lens position signal, and movable by the tracking drive coil An objective lens that controls the calculation of the tracking error signal, and the control unit sets the division pattern of the polarization hologram for DVD used for calculating the tracking error signal in parallel to the traveling direction of the optical pickup. Divide the line in half and update Regions A to D having approximately the same area divided by two lines perpendicular to the traveling direction of the optical pickup are divided into regions A and C, regions B and D diagonally, and region A. When the region α and the region β are newly provided so as to straddle the region D, the region B, and the region C, respectively, and the region α and the region β are defined to be substantially parallel to the traveling direction of the optical pickup, the tracking error signal TE The relational expression for calculating is TE = {(A + D) − (B + C)} − K (β−α), and the relational expression calculated by changing K is changed. By changing the K value of the above relational expression, the tracking error signal calculation method is changed at the recording or reproducing position on the optical disk surface, so that the main beam amount portion of the tracking error calculation signal {(A + D) Since the ratio of-(B + C)} and the sub-beam amount portion (β-α) can be set separately by setting the K value, the tracking error signal calculation method can be made easier depending on the recording or reproducing position on the optical disk surface. Can be changed. As a result, it is possible to calculate an optimal tracking servo tracking error signal depending on the position at which recording or reproduction is performed on the optical disk surface, and to prevent the tracking servo controlled based on the tracking error signal from being lost. An optical disc device that can be used can be realized.

(Embodiment 1)
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an optical disk, 2 is a pickup module, 3 is a spindle motor, 4 is a tracking drive coil, 5 is an objective lens, 6 is a reflected light receiving means, 7 is a tracking error signal calculating means, and 8 is a tracking servo control means. , 9 is a tracking drive voltage supply means, 10 is an APP method K value storage means, 11 is a CPU, and 12 is a digital servo controller.

  An optical disc apparatus according to an embodiment of the present invention configured as described above will be described.

  In FIG. 1, a pickup module 2 includes a spindle motor 3 that rotates an optical disc 1, an optical pickup that performs at least one of reading and writing information signals on the optical disc 1 using a laser emission pattern, and an optical pickup. And a feed unit for moving the carriage in the radial direction of the optical disc 1.

  The tracking error signal calculation means 7 calculates a tracking error signal based on the signal output from the reflected light receiving means 6 inside the optical pickup in the carriage provided inside the pickup module 2, and Is output to the tracking servo control means 8. The tracking error signal is a signal including positional deviation information in the radial direction of the optical disc 1 between the light beam spot and the information track of the optical disc 1. The tracking error signal calculation means 7 takes out the tracking error signal and outputs it to the tracking servo control means 8. The tracking servo control means 8 outputs a signal for controlling the positional relationship between the information track and the light beam to the tracking drive voltage supply means 9 using the tracking error signal.

  The tracking drive voltage supply means 9 generates an output voltage for moving the tracking drive coil 4 on the basis of the obtained lens signal, and outputs the output voltage to move the tracking drive coil 4 to obtain an objective provided in the optical pickup. The lens 5 is moved. In this way, by moving the objective lens 5, the light beam spot can follow the information track of the optical disk 1.

  The tracking servo control means 8 is composed of an ON / OFF circuit, an arithmetic circuit, a filter circuit, an amplifier circuit, etc., and performs focus / tracking control of the objective lens 5 so that the light beam spot follows the information track of the optical disk 1, Using the low frequency component of the tracking error signal, feed control is performed so that the objective lens 5 maintains a substantially neutral position.

  The feed unit (not shown) is composed of a feed motor, a gear, a screw shaft, and the like, and the carriage moves by rotating the feed motor so that feed motor pulses are periodically output from the feed motor. It has become.

  The digital servo controller 12 receives signals sent from the tracking drive coil 4, reflected light receiving means 6, tracking error signal calculation means 7, tracking drive voltage supply means 9, and feed section (not shown). A signal calculation process or the like is performed, the result (signal) of this calculation process is sent to each part, and each part is driven and processed to control each part.

  The CPU 11 is a control unit according to the present invention, and performs feedback among the APP method K value storage means 10, the tracking error signal calculation means 7, and the tracking servo control means 8 in the CPU 11, and is the minimum K used in the APP method. By determining the value, an optimal tracking error signal can be calculated.

  Here, the area configuration of the optical disk will be described.

  FIG. 2 is a cross-sectional view showing an area configuration of the optical disc. In FIG. 2, 101 is a center hole, 102 is a non-user data recording area, 102a is a test writing area, 102b is a disc information management area, and 103 is a user data area.

  The optical disk 1 is arranged in the order of a test writing area 102a, a non-user data area 102 such as a disk information management area 102b, and a user data area 103 from a central hole 101 provided in the center of the disk toward the outer periphery in the radial direction. In the non-user data area 102 such as the test writing area 102a and the disk information management area 102b, a test writing area used for an OPC (Optimum Power Calibration) operation for obtaining an optimum recording power for recording on the surface of the optical disk 1 or the like There is an area in which disc management information such as TOC (Table Of Contents) is written. The user data area 103 is an area used in accordance with a user instruction.

  The optical disc 1 is generally easily damaged on the outer peripheral side and less likely to be damaged on the inner peripheral side in terms of its structure, configuration or use, and a test writing area 102a provided on the inner peripheral side, disc information In the non-user data recording area such as the management area 102b, there are many recorded / unrecorded areas.

  Next, an APP method, which is an example of a tracking error signal calculation method, will be described using a DVD polarization hologram.

  FIG. 3 is a polarization hologram division pattern diagram for DVD in an embodiment of the present invention.

The division pattern of the DVD polarization hologram used for calculating the tracking error signal is divided into two by a line parallel to the traveling direction of the objective lens 5 provided in the optical pickup, and further perpendicular to the traveling direction of the optical pickup. The regions A to D, which are divided by two lines with the same area, are divided into regions A and C, regions B and D diagonally, and regions A and D, regions B and C, respectively. When a region α and a region β are newly provided so as to straddle each other and the region α and the region β are defined to be substantially parallel to the traveling direction of the optical pickup, the tracking error signal calculation method in the PP method uses the region α and the region β. Is included in each of the regions A to D, the tracking error signal TE is
TE = (A + D) − (B + C) (Formula 1)
Is calculated by Further, in the tracking error signal calculation method in the APP method, the tracking error signal TE is expressed in a state where the regions A to D, the region α, and the region β exist.
TE = {(A + D) − (B + C)} − K (β−α) (Equation 2)
Is calculated by

  In the tracking error signal calculation method in the APP method, (A + D) − (B + C), which is the first half of (Equation 2), is the same as in the conventional PP method, and the regions α and β divided by the slits are reversed in polarity. Since the PP method is established, the DC offset is theoretically completely removed when K = 1. Here, K is divided by slits and is a parameter indicating the degree of influence of the PP method having the reverse polarity.

  Next, the tracking error signal calculation method, which is a characteristic part of the present invention, will be described using the APP method as an example.

  FIG. 4 is a flowchart showing a tracking error signal calculation method according to an embodiment of the present invention.

  When the optical disc 1 is inserted (S1), the spindle motor 3 is rotated, the optical pickup laser is emitted, focus servo and tracking servo are applied (S2), and the disc information of the optical disc 1 is acquired. .

At the time of disk information acquisition, the above relational expression is
TE = {(A + D) − (B + C)} − K (β−α) (Equation 2)
In order to determine the K value, the tracking error signal calculation means, based on the command of the CPU 11, applies to the recorded / unrecorded boundary area of the non-user data area 102 such as the test writing area 102a and the disk information management area 102b shown in FIG. While the K value is varied, the K value that causes the tracking error is acquired and stored in the APP method K value storage means 10 in the CPU 11 (S3). Here, when the K value that causes a tracking error in the recorded / unrecorded boundary area of the non-user data area 102 is K = 0.3, the K value stored in the APP method K value storage means 10 is K = 0.3.

  Next, depending on whether or not the seek address is in the user data area 103, the case value setting of the K value used in the APP method is performed based on the K value stored in the APP method K value storage means 10 (S4). By doing so, it is possible to calculate a tracking error signal corresponding to each of a recording area having a large number of recorded / unrecorded boundary areas or an area having a small number of recorded / unrecorded boundary areas on the optical disc 1.

  In the present embodiment, the optical disk 1 is divided into two areas, and the constant K used for the non-user data recording area 102 is a fixed value, and the relational expression TE = {(A + D) − (B + C)} − K ( The constant K used for β−α) is obtained in advance to obtain a K value at which the tracking servo is disengaged at the recording / unrecording boundary in the disc management area, and based on the K value, the optical disc 1 from which the K value has been obtained in advance is obtained. All or part of the K value to be used is determined. The determination of the constant K used in the above relational expression obtains in advance the K value at which the tracking servo deviates at the recording / unrecorded boundary in the disc management area, and based on the K value, the optical disc 1 from which the K value has been obtained in advance is obtained. By determining all or part of the K value to be used, it is possible to cope with variations due to the combination of the optical disk device and the optical disk, depending on the recording status on the surface of the optical disk 1 and the problems that are expected to occur when the optical disk 1 is used. A tracking error signal can be calculated.

  For example, when the seek address is not the user data area 103, that is, in the non-user data area 102, the K value is set to 0.5 whatever the K value stored in the APP method K value storage means 10 becomes. (S6). If the seek address is the user data area 103 and the K value stored in the APP method K value storage means 10 is 0.3, the stored K value (learning result) 0. 3 is set to K = 0.4, which is obtained by adding 0.1 to the error margin included in the various signals (S7).

  Here, in the present embodiment, the K value is not set to a value exceeding 0.5 in consideration of the capability value of the optical pickup. Therefore, for example, when the K value acquisition result is K = 0.4, the seek address is 0.5 in the non-user recording area, and the seek address is 0.5 in the user recording area. Become. Also, for example, when the K value acquisition result is K = 0.5, the seek address is 0.5 for the non-user recording area, and the seek address is 0.5 for the user recording area. Become.

A relational expression between the K value thus obtained and the tracking error signal TE.
TE = {(A + D) − (B + C)} − K (β−α) (Equation 2)
Thus, the tracking error signal is calculated. By doing this, the ratio of {(A + D) − (B + C)}, which is the main beam amount portion of the tracking error calculation signal, and (β−α), which is the sub beam amount portion, is set separately by setting the K value. Therefore, the tracking error signal calculation means can be easily changed depending on the recording or reproducing position on the surface of the optical disc 1.

  In this way, it is possible to calculate a tracking error signal corresponding to each of a recording area with a large number of recorded / unrecorded boundary areas or an area with a small number of recorded / unrecorded boundary areas on the optical disk 1, Problems that are expected to occur when the optical disc 1 is used, such as the recording status on the surface of the optical disc 1, such as being able to calculate a tracking error signal corresponding to an area where many scratches are expected to occur during use It is possible to calculate a tracking error signal corresponding to.

  As a result, it is possible to calculate an optimal tracking error signal for tracking servo depending on the position where recording or reproduction is performed on the surface of the optical disc 1, and to avoid the tracking servo controlled based on the tracking error signal from being lost. It is possible to realize an optical disc apparatus capable of performing the control and a control method therefor.

  In the present embodiment, the APP method has been described as an example of the tracking error signal calculation method that is changed depending on the recording or reproducing position on the optical disk 1 surface. However, recording or reproducing on the optical disk 1 surface is described. The tracking error signal calculation method that is changed depending on the position to be performed is not limited to the APP method, but the present invention can be easily realized by using the APP method.

  In this embodiment, the tracking error signal calculation method is determined for each of the non-user data recording area 102 and the user data recording area 103. However, the tracking error signal calculation method is limited to this case. It is not a thing. For example, if the tracking error signal calculation method is changed according to the radial position of the optical disc 1, a tracking error signal corresponding to an area where many scratches are expected to occur when the optical disc 1 is used is generated. Can be calculated. Further, in the constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α) used in the tracking error signal calculation method, an area provided on the outer peripheral side in the radial direction of the optical disc 1 Since the K value used for the optical disk 1 is smaller than the K value used for the area provided on the inner peripheral side in the radial direction of the optical disk 1, it is expected that many scratches will occur when the optical disk 1 is used. A tracking error signal corresponding to the outer peripheral side region of the optical disc 1 can be calculated.

  Furthermore, in the present embodiment, the determination of the constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α) for calculating the tracking error signal is performed in the recording / recording area 102b. The K value at which the tracking servo is released at the unrecorded boundary is acquired in advance, and based on the K value, all of the K values used for the optical disc 1 from which the K value has been acquired in advance are determined. It is not limited to all, and some cases may be used. In this case, for the K value that has not been determined, it is necessary to acquire again the K value from which the tracking servo is removed in the user data recording area 103 or the like.

  The present invention can calculate the tracking error signal for the optimal tracking servo depending on the position where recording or reproduction is performed on the optical disk surface, and avoids the tracking servo controlled based on the tracking error signal from being lost. Therefore, the present invention can be applied to a method for controlling an optical disc apparatus that performs at least one of recording and reproduction of information on an optical disc, an optical disc apparatus, and the like.

1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. Sectional view showing area configuration of optical disc FIG. 4 is a diagram illustrating a polarization hologram division pattern for a DVD according to an embodiment of the present invention. The flowchart which shows the tracking error signal calculation method in one embodiment of this invention Block diagram of a conventional optical disk device Polarization hologram division pattern diagram for DVD

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Pickup module 3 Spindle motor 4 Tracking drive coil 5 Objective lens 6 Reflected light light receiving means 7 Tracking error signal calculating means 8 Tracking servo control means 9 Tracking drive voltage supply means 10 APP method K value storage means 11 CPU
12 Digital servo controller 101 Center hole 102 Non-user data recording area 102a Trial writing area 102b Disk information management area 103 User data recording area

Claims (8)

A method for calculating a tracking error signal of an optical disc apparatus that performs tracking control using a tracking error signal, wherein a relational expression for calculating the tracking error signal is changed depending on a position at which recording or reproduction is performed on an optical disc surface. A method for controlling an optical disk apparatus. 2. The method of controlling an optical disc apparatus according to claim 1, wherein the relational expression for calculating the tracking error signal is changed depending on a radial position of the optical disc. The division pattern of the polarization hologram for DVD used for the calculation of the tracking error signal is divided into two equal parts by a line parallel to the traveling direction of the optical pickup, and further two parts by a line perpendicular to the traveling direction of the optical pickup. The regions A to D having substantially the same area are divided so that the region A and the region C, the region B and the region D are diagonally crossed, and the region A and the region D, and the region B and the region C are respectively straddled. When a region α and a region β are newly provided and the region α and the region β are defined to be substantially parallel to the traveling direction of the optical pickup, the relational expression for calculating the tracking error signal TE is:
TE = {(A + D) − (B + C)} − K (β−α)
3. The method of controlling an optical disk device according to claim 1, wherein the relational expression for calculating the tracking error signal is changed by changing K. The constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α), and the K value used in the area provided on the outer peripheral side in the radial direction of the optical disc is: 4. The method of controlling an optical disk device according to claim 1, wherein the optical disk apparatus has a smaller K value used in a region provided on an inner peripheral side in a radial direction of the optical disk. A constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α), and K used in at least one of the disk information management area of the optical disk or the trial writing area of the disk. 5. The method of controlling an optical disc apparatus according to claim 1, wherein the value is larger than a K value used in the user data area. The constant K used in the relational expression TE = {(A + D) − (B + C)} − K (β−α) is determined in advance by setting the K value at which the tracking servo is removed at the recording / unrecording boundary in the disk information management area. 6. The method of controlling an optical disc apparatus according to claim 1, wherein all or part of the K value used for the optical disc is determined based on the acquired K value. An optical pickup that records and / or reproduces data using a laser emission pattern, reflected light receiving means for receiving reflected light from an optical disk, and tracking error signal calculation for calculating a tracking error signal from the received signal Means, tracking servo control means for generating a lens position signal from the tracking error signal, tracking drive voltage supply means for driving the tracking drive coil based on the lens position signal, an objective lens movable by the tracking drive coil, and a tracking error signal An optical disc apparatus comprising: a control unit that controls the calculation of the tracking error signal, wherein the control unit changes a relational expression for calculating the tracking error signal according to a recording or reproducing position on the optical disc surface. An optical pickup that records and / or reproduces data using a laser emission pattern, reflected light receiving means for receiving reflected light from an optical disk, and tracking error signal calculation for calculating a tracking error signal from the received signal Means, tracking servo control means for generating a lens position signal from the tracking error signal, tracking drive voltage supply means for driving the tracking drive coil based on the lens position signal, an objective lens movable by the tracking drive coil, and a tracking error signal A control unit for controlling the calculation of
The control unit divides the division pattern of the polarization hologram for DVD used for calculation of the tracking error signal into two equal parts by a line parallel to the traveling direction of the optical pickup, and further to the traveling direction of the optical pickup. Regions A to D formed by dividing the vertical line into two equal parts, region A and region C, region B and region D are diagonal, and region A and region D, region B and region C are straddled, respectively. Thus, when the region α and the region β are newly provided and the region α and the region β are defined as being substantially parallel to the traveling direction of the optical pickup, the relational expression for calculating the tracking error signal TE is as follows:
TE = {(A + D) − (B + C)} − K (β−α)
An optical disc apparatus characterized by changing a relational expression calculated by changing K.

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