JP2005310289A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress fluctuation of servo control due to cross talk between layers in difference of inner and outer circumference and multilayer structure of an optical disk in the optical disk device. <P>SOLUTION: Based on a tracking error signal or a focus error signal, a servo processor 30 of the optical disk device performs servo control for an optical pickup 16 and performs recording or reproducing data. An optical disk 10 is divided into multiple zones in radius direction, and the optimal servo parameter at the approximately central position in each zone is set as a common servo parameter in the zone concerned. When a recording/reproducing track moves to the next zone, the optical pickup 16 is sought to the central position in the next zone concerned where servo adjustment is performed and then is sought to the head track of the zone concerned, and the recording or reproducing data is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disk device, and more particularly to servo control such as tracking servo and focus servo.

  In general, in an optical disk device such as a CD drive, DVD drive, HD-DVD drive, or Blu-ray disk drive, when an optical disk is inserted, the optical pickup is first moved to the vicinity of the innermost periphery of the optical disk to perform focus servo. Next, the tracking servo sequence is performed. Adjustments necessary for the focus servo and various adjustments necessary for the tracking servo are performed near the innermost circumference of the optical disk.

  However, optical disks are not manufactured with uniform characteristics from the inner periphery to the outer periphery, and the reflectance differs between the inner periphery and the outer periphery, or the amplitude and offset of the tracking error signal, the amplitude and offset of the focus error signal, etc. Can fluctuate.

  In particular, in a high-density optical disk having a multilayer structure in which two or more recording layers are present, reflected light from the second layer is mixed into the optical pickup during data recording or reproduction on the first layer (or the second layer). (Reflected light from the first layer is mixed into the optical pickup during recording or reproduction of data to the optical pickup). When servo adjustment is performed only on the inner circumference of the optical disc, A large servo residual is generated, and tracking or defocusing occurs, making it difficult to record or reproduce data.

  In view of such problems, a correspondence relationship between the radial position of the optical disk and the servo adjustment value is created in consideration of the difference between the inner and outer peripheral characteristics of the optical disk when the drive is started, and the servo parameter P1 at the radial position r1 and the servo parameter at the radial position r2. There has also been proposed an optical disc apparatus that performs servo control by changing a servo parameter for each radial position by holding P2 and the like as a table and referring to the table during recording or reproduction.

  In addition, in the prior art shown below, when reproducing data from the optical disk, when the amount of data to be reproduced is equal to or greater than one rotation of the optical disk, reading from the optical disk is stopped and jumping to a track where data has been reproduced is performed. A technique is described in which servo gain and servo offset adjustment is performed on the track, and then the data reproduction operation is restarted to eliminate the influence of the inner and outer circumference differences of the optical disk.

JP-A-8-180624

  However, in the method in which the servo parameter for the radial position of the optical disk is created and stored in advance as a table and the servo parameter is set by referring to the table at the time of data recording or reproduction, the table is created and the actual recording and reproduction are performed. When there is a change in conditions, particularly when a temperature difference occurs, the tracking error signal and the focus error signal change, so there is a problem that the servo parameters of the table do not become optimum values.

  Further, in the above-described prior art, the servo gain and the servo offset are adjusted every time data corresponding to one rotation of the optical disk is reproduced, so that the data reproduction speed is remarkably reduced. Although this prior art is basically only applied to data reproduction, when this is applied to data recording in an optical disc apparatus capable of recording data, data recording is stopped for each track, and data recording is performed. Since the speed is remarkably reduced, there is a problem that it is impossible to meet the recent demand for high-speed data recording.

  The object of the present invention is to perform servo control with certainty even in the presence of variations in optical disk characteristics, especially differences in reflectivity and groove shape at the inner and outer circumferences, and even interlayer crosstalk in an optical disk having a multilayer structure. Another object of the present invention is to provide an optical disc apparatus that can perform reproduction.

  The present invention includes an optical pickup that emits laser light for data recording or reproduction to an optical disc, receives reflected light from the optical disc, converts it into an electrical signal, and outputs it, and the signal from the optical pickup includes An optical disc apparatus having servo control means for servo-controlling the optical pickup based on a tracking error signal or a focus error signal, wherein the optical disc is logically divided into a plurality of zones in a radial direction, and the optical pickup is First seek means for interrupting the data recording or reproduction when the zone is shifted from the first zone to the second zone and seeking the optical pickup to a substantially central track of the second zone; and the substantially central track And adjusting means for adjusting the servo parameters for servo control, and Storage means for storing servo parameters as second zone servo parameters; and second seek means for seeking the optical pickup from the substantially central track to the first track of the second zone; and the servo control means, Data recording or reproduction is performed while performing servo control in the second zone using the second zone servo parameters stored in the storage means.

  In the present invention, the optical disk is logically divided into a plurality of zones in consideration of the inner / outer circumference difference of the optical disk characteristics and the influence of interlayer crosstalk, and the servo parameters are optimized in each zone. That is, when recording or reproducing data in a certain zone, assuming that the servo parameters used in the previous zone are not appropriate, the recording or reproducing of data is temporarily suspended, and the optical pickup is moved to the approximate center of the zone. Seek to position. Then, servo adjustment is performed at a substantially central position of the zone, and servo parameters are acquired. Thereafter, the optical pickup is returned to the head track of the zone again, and data recording or reproduction is resumed in the zone while performing servo control with the acquired servo parameters. By setting the zone width to an appropriate size, the servo parameters in that zone can be represented by the servo parameters in the center, and by changing the servo parameters dynamically for each zone, it is optimal at all positions on the optical disk. Servo control is possible.

  In a certain zone, the servo parameters obtained by adjusting the central position of the zone are used, but the error is minimized by using the value of the central position although the characteristics are not completely constant even within the zone. It is based on the premise that If there is a certain tendency, such as a linear change in the characteristics, for example, the tracking offset, within the zone, the servo parameter is changed linearly based on the servo parameter at the head of the zone or the last track of the zone, etc. Although this method can also be theoretically considered, the characteristics are actually changing nonlinearly, and the characteristics can change nonlinearly even within the zone, so the central position should be the representative value. Is preferred.

  According to the present invention, servo control can be reliably performed and data can be recorded or reproduced even in the presence of variations in characteristics between the inner and outer circumferences of an optical disc or interlayer crosstalk in an optical disc having a multilayer structure. In addition, since the servo control of the zone is performed with the servo parameter at the approximate center position of each zone, the frequency of interruption of data recording or reproduction is also suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall configuration diagram of an optical disc apparatus according to the present embodiment. A data recordable optical disk 10 such as a CD-RW, DVD + RW, DVD-RW, or DVD-RAM is rotated by a spindle motor (SPM) 12. The spindle motor SPM 12 is driven by a driver 14, and the driver 14 is servo-controlled by a servo processor 30 so as to have a desired rotation speed.

  The optical pickup 16 includes a laser diode (LD) for irradiating the optical disk 10 with laser light and a photodetector (PD) that receives reflected light from the optical disk 10 and converts it into an electrical signal, and is disposed opposite to the optical disk 10. . The optical pickup 16 is driven in the radial direction of the optical disk 10 by a thread motor 18, and the thread motor 18 is driven by a driver 20. The driver 20 is servo-controlled by the servo processor 30 similarly to the driver 14. The LD of the optical pickup 16 is driven by a driver 22, and the driver 22 is controlled by an auto power control circuit (APC) 24 so that the drive current becomes a desired value. The APC 24 controls the drive current of the driver 22 so that the optimum recording power is selected by OPC (Optimum Power Control) executed in the innermost test area (PCA) of the optical disc 10. The OPC is a process of recording test data on the PCA of the optical disc 10 by changing the recording power in a plurality of stages, reproducing the test data, evaluating the signal quality, and selecting a recording power that provides a desired signal quality. It is. For the signal quality, β value, γ value, modulation factor, jitter, etc. are used.

  When data recorded on the optical disk 10 is reproduced, a laser beam of reproduction power is irradiated from the LD of the optical pickup 16, and the reflected light is converted into an electric signal by the PD and output. A reproduction signal from the optical pickup 16 is supplied to the RF circuit 26.

  The RF circuit 26 generates a focus error signal and a tracking error signal from the reproduction signal and supplies them to the servo processor 30. The tracking error signal is generated by, for example, a differential push-pull (DPP) method. Specifically, the laser beam is divided into one main beam and two sub beams by a grating or the like, and the main beam push-pull signal and the sub-beam push-pull signal are divided. It is generated by the difference. The focus error signal is generated by, for example, an astigmatism method.

  The servo processor 30 servo-controls the optical pickup 16 based on these error signals, and maintains the optical pickup 16 in an on-focus state and an on-track state.

  Further, the RF circuit 26 supplies an address signal included in the reproduction signal to the address decoding circuit 28. The address decoding circuit 28 demodulates the address data of the optical disk 10 from the address signal and supplies it to the servo processor 30 and the system controller 32. One example of an address signal is a wobble signal in the case of a CD-RW disc. The wobble signal is extracted from a reproduction signal by wobbling the track of the optical disc 10 with a time information modulation signal indicating the absolute address of the optical disc 10. The address data (ATIP) can be obtained by decoding. In the case of a DVD-RW disc, address data can be obtained by the land pre-pit method. In the case of a DVD-RAM disc, address data can be obtained by a CAPA (Complimentary Allocated Pit Addressing) method, and the address data exists in the header portion recorded in the sector.

  Further, the RF circuit 26 supplies the reproduction RF signal to the binarization circuit 34. The binarization circuit 34 binarizes the reproduction signal and supplies the obtained EFM signal (CD disc) or 8-16 modulation signal (DVD disc) to the encode / decode circuit 36. The encode / decode circuit 36 obtains reproduction data by performing EFM demodulation or 8-16 demodulation and error correction on the binarized signal, and outputs the reproduction data to a host device such as a personal computer via the interface I / F 40. When the reproduction data is output to the host device, the encoding / decoding circuit 36 temporarily stores the reproduction data in the buffer memory 38 and outputs it.

  When recording data on the optical disk 10, data to be recorded from the host device is supplied to the encode / decode circuit 36 via the interface I / F 40. The encode / decode circuit 36 stores data to be recorded in the buffer memory 38, encodes the data to be recorded, and supplies the data to the write strategy circuit 42 as EFM data or 8-16 modulation data. The write strategy circuit 42 converts the EFM data into a multi-pulse (pulse train) according to a predetermined recording strategy and supplies it to the driver 22 as recording data. The recording strategy is composed of, for example, the pulse width of the first pulse, the pulse width of the subsequent pulse, and the pulse duty in the multi-pulse. Since the recording strategy affects the recording quality, it is usually fixed to a certain optimum strategy. A recording strategy may be set at the time of OPC. The laser light whose power is modulated by the recording data is irradiated from the LD of the optical pickup 16 and the data is recorded on the optical disk 10. Data recording is in units of packets. After recording the data in packet units, the optical pickup 16 reproduces the recorded data by irradiating the laser beam with the reproduction power, and supplies it to the RF circuit 26. The RF circuit 26 supplies the reproduction signal to the binarization circuit 34, and the binarized EFM data or 8-16 modulation data is supplied to the encode / decode circuit 36. The encode / decode circuit 36 decodes the EFM data or the 8-16 modulation data and collates it with the recording data stored in the buffer memory 38. The result of the verification is supplied to the system controller 32. The system controller 32 determines whether to continue recording data or execute a replacement process according to the result of verification.

  FIG. 2 is a block diagram showing the configuration of the servo processor 30 in FIG. The servo processor 30 includes a processor (DSP) 30a and a memory 30b. The memory 30b performs servo adjustment in each zone of the optical disk 10 and an area (initial parameter area) for storing initial parameters acquired by servo adjustment executed on the innermost circumference of the optical disk 10 after insertion of the optical disk 10 as in the conventional case. An area (zone parameter area) for storing parameters obtained by this is provided. Specifically, the servo parameter is a tracking servo gain or offset, a focus servo gain or offset, or a tilt control gain or offset. Any or all of these are stored in the memory 30b. The memory 30b is composed of a rewritable memory, such as a RAM or a flash ROM.

  When recording or reproducing data in a certain zone of the optical disc 10, the processor 30a reads out the servo parameters of the zone stored in the zone parameter area of the memory 30b and performs servo control. The servo parameters of the zone are parameters acquired as a result of servo adjustment at the approximate center position of the zone. In the zone, servo control is performed using the servo parameters acquired at the approximate center position in common. In the optical disc 10, there are differences in inner and outer peripheral characteristics such as reflectance. However, by setting the zone sufficiently finely and setting the characteristics to be considered to be substantially constant in the zone, the optimum servo parameter in the zone is set. Can be matched with the servo parameter at the center position. Although the size of the zone of the optical disk 10 is arbitrary, for example, the width of each zone is preferably about 500 μm. Even if the zone width is too small, it will be meaningless because the servo parameters that are hardly changed in the adjacent zones will be set. On the other hand, if the zone width is set too large, the servo parameters can be represented at the center position. Disappear. The zone width is set in consideration of these balances. The zone width may be defined in consideration of the amount of eccentricity of the optical disc 10.

  The basic operation of the processor 30a is as follows. That is, when the servo control for recording or reproducing data in a certain zone is performed, the optical pickup 16 is first sought to the substantially central track position of the zone by a command from the system controller 32. Thereafter, servo adjustment is performed in the central track, and servo parameters for servo control in the zone are acquired. The acquired servo parameters are stored in the zone parameter area of the memory 30b. Thereafter, the optical pickup 16 is returned to the head track of the zone, and data is recorded or reproduced sequentially from the head track. Data recording or reproduction in the zone is performed while performing servo control using the servo parameters in the zone in common.

  FIG. 3 is a functional block diagram of the processor 30a in FIG. The tracking error signal and the focus error signal from the RF processing unit 26 are converted into digital signals by the A / D 30a1, multiplied by the multiplier 30a2, and then supplied to the gain compensation unit 30a3 and the phase compensation unit 30a4. The signal compensated for gain by the gain compensator 30a3 and the signal compensated for phase by the phase compensator 30a4 are added by an adder 30a5, then amplified again by a multiplier 30a6, and returned to an analog signal by a D / A 30a7. Supplied to a driver for focus control or tracking control. The gain in the processor 30a can be made variable, for example, by changing the multiplication coefficient in the multiplier 30a6. Specifically, the gain can be made variable by changing the value of the register 30a8. The set value of the register 30a8 is set by a zone parameter in the memory 30b. That is, when data is recorded or reproduced in the first zone among the plurality of zones of the optical disc 10, the servo parameters for zone 1 are read from the memory 30b and set in the register 30a8. When recording or reproducing data in the second zone of the optical disk 10, the servo parameters for zone 2 are read from the memory 30b and set in the register 30a8. As a result, the servo parameters for zone 1 are set in the first zone, and the servo parameters for zone 2 are set in the second zone 2, so that servo control can be performed with the optimum servo parameters in each zone. Data can be recorded or reproduced.

  Hereinafter, the zone of the optical disc 10 and the method for setting the zone parameters in each zone will be described in more detail.

  FIG. 4 shows a partially enlarged view of the optical disc 10. As illustrated, the optical disk 10 is divided into a plurality of zones in the radial direction. Of course, this zone is not physically divided but logically divided, and is similar to a logical sector. In the figure, for convenience of explanation, only zones 1, 2, and 3 are shown. However, when the zone width is set to about 500 μm, for example, it is clear that there are 60 to 70 zones in a 12 cm optical disc. The zone width is arbitrary, and can be set to 500 μm or less as necessary. For example, it is preferable that each zone includes several tens to several hundred tracks. When the optical disk 10 is inserted, the system controller 32 may read the unique data of the optical disk 10 and divide it into zones according to this data. Data to be created by the system controller 32 is a track address included in each zone. For example, zone 1 is track No. 1-No. Up to 50, zone 2 is track no. 51-Track No. Up to 100 and so on. The number of tracks included in each zone may be defined. When data is recorded or reproduced sequentially from the inner circumference side to the outer circumference side, it can be specified in which zone if the number of recording or reproduction tracks is known. When the optical disc 10 has a multilayer structure, a zone may be set for each layer, or a zone may be set in common for each layer.

  FIG. 5 shows the seek operation of the optical pickup 16 when the data recording or reproduction in the zone 1 is completed and then the operation moves to the adjacent zone 2. The track address belonging to each zone is defined in advance, and when data recording or reproduction is completed in the last track in zone 1, the next track is shifted to the first track in zone 2. Based on the command, the servo processor 30 causes the optical pickup 16 to seek from the last track in the zone 1 to the central track in the zone 2. In the figure, the last track position of zone 1 is indicated by Pe, and the central track position of zone 2 is indicated by Pm. Alternatively, instead of the last track in zone 1, the transition may be made to the first track in zone 2 and then seek to the central track in zone 2. After seeking the central track of zone 2, the servo parameters in zone 2 are acquired by adjusting the gain and offset of the tracking servo, the gain and offset of the focus servo, and the gain and offset for tilt control at the track position. . For gain adjustment, for example, a reference disturbance signal is applied to the servo system, the tracking error signal or focus error signal is compared with the reference disturbance signal, the gain difference or phase difference is measured, and the measured gain difference or phase difference is measured. It is executed by comparing with the set value and adjusting it to an appropriate value. In addition, offset adjustment is performed, for example, by measuring the maximum amplitude signal or jitter of the RF signal while changing the offset in a positive or negative direction by a predetermined amount to search for a value that maximizes the RF signal amplitude or minimizes the jitter. To be executed. The acquisition of servo parameters does not have to be completed with only one track located in the center of zone 2, and may be acquired using a plurality of tracks, for example, 4 to 5 tracks. The acquired servo parameters are stored in the memory 30b as zone 2 servo parameters. For example, (Zone 2, tracking gain, tracking offset, focus gain, focus offset) and the like are stored as a set. The servo gain and offset may be stored for each groove and land of the optical disk 10, or may be stored for each layer in the case of the optical disk 10 having a multilayer structure.

  FIG. 6 shows a seek operation of the optical pickup 16 after servo adjustment is performed on the center track of the zone 2 to acquire servo parameters. The servo processor 30 obtains and stores the servo processor for the zone 2 in the central track of the zone 2 and then seeks the optical pickup 16 again to the head track of the zone 2. Of course, this seek operation is for sequentially recording or reproducing data from the head track of zone 2. At this time, it is conceivable that the servo processor 30 seeks using the servo parameters for the zone 2 acquired in the center of the zone 2, but the optical pickup 16 actually does not have the zone during the seek operation as shown in FIG. Since the overshoot from 2 to zone 1 and gradually converge to the head track of zone 2, it is not appropriate to use the zone 2 servo parameters as they are. Therefore, the servo processor 30 performs a seek operation when seeking from the center track of zone 2 to the head track of zone 2 (the same applies when seeking from the head track to the center track first as shown in FIG. 5). The tracking servo and the focus servo are executed using a predetermined servo parameter that is not optimized, that is, not optimized. As a servo parameter at this time, a drive default value stored in advance in the memory 30b may be used. After the optical disk 10 is inserted into the drive, the servo processor 30 first seeks the optical pickup 16 to the innermost circumference of the optical disk 10 and performs servo adjustment at that position. The same control as this sequence is performed to start from the center track. Return the optical pickup to the track. In order to return the optical pickup 16 to the first track once, it is necessary to store the servo parameters acquired in the central track in the memory 30b.

  After returning the optical pickup 16 to the head track of the zone 2 again by the above processing, the servo processor 30 reads the zone 2 parameter stored in the memory 30b and sets it in a register or the like. The data is recorded or reproduced in the zone 2.

  FIG. 8 shows an overall processing flowchart of data recording or reproduction in the present embodiment. First, when the optical disk is inserted into the tray of the optical disk apparatus (drive) (S101), the servo processor 30 seeks the optical pickup 16 to the innermost circumferential position of the optical disk (S102). Then, OPC is performed at the innermost peripheral position to optimize the recording power, and the gain and offset of the tracking servo, the gain and offset of the focus servo, and the gain and offset of tilt control are adjusted (S103).

  After adjusting the recording power and servo parameters in the innermost circumference of the optical disc 10, data is recorded or reproduced (S104). In a zone located on the innermost circumference of the optical disc 10, servo control is performed using servo parameters adjusted on the innermost circumference.

  Then, it is determined whether or not the track on which data is recorded or reproduced has shifted from one zone to the next zone (or whether or not to shift from now on) (S105). This determination is executed by the system controller 32 and is determined by comparing a table defining track addresses included in each preset zone with track addresses to be recorded or reproduced. As described above, for example, when the tracks belonging to the zone 1 are tracks n to n + 100 and the tracks belonging to the zone 2 are n + 101 to n + 200, the data recording or reproduction in the track n + 100 is completed and then recording or reproduction is performed. When the track to be track is track n + 101, it is determined to enter the next zone.

If YES in S105, that is, if it is determined to shift to the next zone, the servo processor 30 temporarily stops the data recording or reproduction before recording or reproducing data on the first track of the next zone, The optical pickup 16 seeks to the center position of the next zone, and the servo parameter is adjusted at the center track position (S106).
It is not necessary to seek to the center position accurately, and there may be a width of several tracks. After adjusting the servo parameter at the center track of the next zone, the servo processor 30 returns the optical pickup 16 to the first track of the next zone again (S107), and the adjusted servo parameters are used in the next zone. Recording or reproduction is performed with servo control.

  FIG. 9 shows details of S106 and S107 in FIG. The servo processor 30 sets a servo parameter to a predetermined value (for example, default value) when the optical pickup 16 seeks from the first track to the center track in the next zone (S201). After setting the servo parameter to a predetermined value, the optical pickup 16 is sought to a substantially central track of the zone using this servo parameter (S202). After seeking to the substantially central track, the gain and offset of the tracking servo and focus servo are adjusted in the zone central track, and stored in the memory 30b as servo parameters for the next zone (S203).

  After storing the servo parameter in the next zone, the servo processor 30 sets the servo parameter to a predetermined value again (S204), and seeks the optical pickup 16 from the substantially central track to the head track position with this servo parameter (S205). ). After seeking to the first track, the servo processor 30 sets the servo parameter for the next zone recorded in the memory 30b and records or reproduces data in the next zone (S206).

  As described above, in the present embodiment, the optical disk 10 is subdivided into a plurality of zones, the servo parameters in each zone are represented by the servo parameters at the center position in the zone, and the servo parameters at the center position are uniformly used for the zone. The servo parameters are adaptively adjusted even if there is a difference between the inner and outer circumferences of the characteristics such as reflectivity or the interlayer crosstalk in the multilayer structure on the optical disc 10, so that data can be recorded or reproduced reliably. It can be performed. In this embodiment, since the servo parameter at the center position of the zone is used in common in the zone, for example, the frequency of interruption of data recording or reproduction can be suppressed as compared with the case where the servo parameter is adjusted for each track. it can. The applicant of the present application performs data recording at a double speed with a conventional apparatus that performs servo adjustment only on the innermost circumference of the optical disk 10, but the apparatus according to the present embodiment can record data at a speed of about 1.8 times. I have confirmed.

  In the present embodiment, the servo parameters in each zone are not acquired in advance and stored as a table, but are acquired in actual data recording or reproduction. There is almost no temperature difference between actual data recording or reproduction and data can be recorded or reproduced under optimum conditions.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

  For example, in the present embodiment, the initial parameter area and the zone parameter area are provided in the memory 30b. However, even if the initial parameters obtained by the servo adjustment on the innermost circumference of the optical disc 10 are sequentially overwritten with the zone parameters. In this case, only the zone parameter area or only the initial parameter area exists.

  In this embodiment, the initial parameters obtained by servo adjustment in the innermost circumference are basically used only for servo control in the innermost zone, but there is almost no variation in characteristics on the inner circumference side of the optical disc. For example, the optical disk 10 is logically divided into three zones, an inner circumferential zone, a middle circumferential zone, and an outer circumferential zone, and all the inner circumferential zones use the innermost servo parameters. Also good.

  The widths of the zones that are logically divided need not be uniform. For example, the width is 500 μm on the inner circumference side, the zone width is reduced toward the outer circumference, and the zones are divided more finely toward the outer circumference. Also good.

  In this embodiment, servo parameters for each zone are stored in the memory 30b as zone parameters. However, once data is recorded or reproduced on the optical disk 10, data recording or reproduction is performed again. When performing, it is determined whether or not the servo parameter of the zone where data is to be recorded or reproduced is stored in the memory 30b. If not stored, the above processing is performed to acquire and store the servo parameter. May be. However, since the temperature may be different between the previous data recording or reproduction and the current data recording or reproduction, the above processing is performed every time data is recorded or reproduced to acquire servo parameters for each zone. It is preferable to store in the memory 30b.

1 is an overall configuration diagram of an optical disc device. FIG. 2 is a configuration block diagram of a servo processor in FIG. 1. FIG. 3 is a functional block diagram of a processor in FIG. 2. It is zone division explanatory drawing of an optical disk. 6 is an explanatory diagram showing a seek operation of the optical pickup when moving from zone 1 to zone 2. FIG. FIG. 11 is an explanatory diagram (part 1) of an operation of seeking to the head track of zone 2; FIG. 11 is an explanatory diagram (part 2) of the operation of seeking the first track of zone 2; It is a whole processing flowchart of an embodiment. It is a detailed process flowchart of S106 and S107 in FIG.

Explanation of symbols

  10 optical disk, 16 optical pickup, 30 servo processor, 32 system controller.

Claims (4)

An optical pickup that emits laser light for data recording or reproduction to an optical disc, receives reflected light from the optical disc, converts it into an electrical signal, and outputs it;
Servo control means for servo-controlling the optical pickup based on a tracking error signal or a focus error signal included in a signal from the optical pickup;
An optical disc device having
The optical disc is logically divided into a plurality of zones in the radial direction,
First seek means for interrupting the data recording or reproduction and seeking the optical pickup to a substantially central track of the second zone when the optical pickup transits from the first zone to the second zone in the plurality of zones. When,
Adjusting means for adjusting the servo parameters for the servo control in the substantially central track;
Storage means for storing servo parameters obtained by the adjustment as servo parameters for the second zone;
Second seek means for seeking the optical pickup from the substantially central track to the first track of the second zone;
And the servo control means records or reproduces data while performing servo control in the second zone using the servo parameters for the second zone stored in the storage means. apparatus. The apparatus of claim 1.
The servo control means is used for the second zone when the first seek means seeks to the substantially central track of the second zone, and when the second seek means seeks to the first track of the second zone. An optical disc apparatus that performs servo control using predetermined servo parameters different from servo parameters. The apparatus according to claim 1,
The optical disk apparatus, wherein the servo parameter includes at least one of a tracking or focus gain, a tracking or focus offset, and a tilt amount. An optical pickup that emits laser light for data recording or reproduction to an optical disc, receives reflected light from the optical disc, converts it into an electrical signal, and outputs it;
Servo control means for servo-controlling the optical pickup based on a tracking error signal or a focus error signal included in a signal from the optical pickup;
An optical disc device having
The optical disc is logically divided into a plurality of zones in the radial direction,
First seek means for seeking the optical pickup to the innermost circumferential position of the optical disc prior to recording or reproduction of data when the optical disc is inserted;
First adjustment means for adjusting servo parameters for the servo control at the innermost circumferential position;
When the optical pickup moves from the innermost peripheral zone in the plurality of zones to the next second zone, the data recording or reproduction is interrupted, and the optical pickup seeks to a substantially central track of the second zone. Two seek means,
Second adjusting means for adjusting again the servo parameters for the servo control in the substantially central track;
Storage means for storing the servo parameters obtained by adjusting again as servo parameters for the second zone;
A third seek means for seeking the optical pickup from the substantially central track to a leading track of the second zone;
And the servo control means records or reproduces data while performing servo control in the second zone using the servo parameters for the second zone stored in the storage means. apparatus.

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