JP2008186538A - Optical disk unit and optical disk recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance recording quality by enabling a satisfied recording clock to be formed even when a failure arises on a disk. <P>SOLUTION: In this optical disk unit, a WAP address counter 58 detects a first address on the basis of a wobble formed on the optical disk, a recording data address counter 59 detects a second address included in the recording data, an error detector 60 compares the detected second address with the first address and judges whether a deviation larger than a preset prescribed reference value is present or not between the first address and the second address, a third frequency divider 57 changes the number of clock frequency divisions when the presence of the deviation larger than the preset prescribed reference value is judged. A phase comparator 53, an LPF 54, a VCO 55 and a second frequency divider 56 use the number of changed clock frequency divisions to generate recording clocks which are used when the recording data are recorded on the optical disk. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus and an optical disc recording / reproducing method, and more particularly, to an optical disc apparatus and an optical disc recording method capable of generating a recording clock.

  When recording data on an optical disc by CAV (Constant Angular Velocity), the linear velocity changes depending on the radius of the recording position on the disc. Therefore, it is necessary to change the data recording rate during recording so that the recording density can be kept constant. When changing the data recording rate, generally, for example, a recording clock is generated using wobbles formed in advance on an optical disc, and the data recording rate is changed based on the generated recording clock (see, for example, Patent Document 1).

According to the technique proposed in Patent Document 1, a necessary recording clock frequency is calculated from address information modulated and recorded in a wobble signal, and a signal of the calculated recording clock frequency is converted to a crystal oscillator or the like. A recording clock can be generated from a stable reference signal source by a synthesis method.
JP 2005-18901 A

  However, in the technique proposed in Patent Document 1, the recording clock is corrected by comparing the prepit address and the recording data address. However, the recording clock serving as the correction source is a radial position from the prepit address. Therefore, there is a problem that the quality of the recording clock is deteriorated for a disk having poor mechanical characteristics.

  The present invention has been made in view of such circumstances, and provides an optical disc apparatus and an optical disc recording method capable of generating a suitable recording clock even when a disc has a defect. Objective.

  In order to solve the above-described problems, an optical disc apparatus of the present invention detects a first address that detects a first address and a second address included in recording data based on wobble formed on the optical disc. Comparing the first address detected by the second detection means, the first address detected by the first detection means, and the second address detected by the second detection means, the first address and the second address Between the first address and the second address by the determination means for determining whether or not there is a deviation larger than a predetermined reference value set in advance. When it is determined that there is a deviation larger than the predetermined reference value, the change means for changing the clock frequency division number, and the recording data to be recorded on the optical disc using the clock frequency division number changed by the change means It characterized in that it comprises generating means for generating a recording clock used.

  In order to solve the above-described problem, the optical disc recording method of the present invention includes a first detection step for detecting a first address, a second detection step for detecting a second address included in the recording data, The first address detected by the process of the first detection step is compared with the second address detected by the process of the second detection step, and between the first address and the second address , A determination step for determining whether there is a deviation larger than a predetermined reference value set in advance, and a predetermined value set in advance between the first address and the second address by the processing of the determination step When it is determined that there is a deviation larger than the reference value, the change step for changing the clock division number and the clock division number changed by the process of the change step are recorded on the optical disc. Characterized in that it comprises a generation step of generating a recording clock used in recording the data.

  In the optical disc apparatus of the present invention, the first address is detected based on the wobble formed on the optical disc, the second address included in the recording data is detected, and the detected first address and the detected first address are detected. 2 are compared, and it is determined whether or not there is a deviation larger than a predetermined reference value set in advance between the first address and the second address. When it is determined that there is a deviation larger than a predetermined reference value set in advance, the clock frequency division number is changed and recorded on the optical disk using the changed clock frequency division number. A recording clock used for recording data is generated.

  In the optical disc recording method of the present invention, the first address is detected based on the wobble formed on the optical disc, the second address included in the recording data is detected, and the detected first address is detected. The second address is compared, and it is determined whether or not a deviation larger than a predetermined reference value set in advance exists between the first address and the second address. When it is determined that there is a deviation larger than a predetermined reference value set in advance with the second address, the clock frequency division number is changed, and the changed clock frequency division number is used for the optical disc. A recording clock used when recording the recording data is generated.

  According to the present invention, it is possible to generate a suitable recording clock even when a disc has a defect, so that it is possible to improve recording quality and to reduce errors during reproduction. .

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

  FIG. 1 shows the configuration of an optical disc apparatus 1 according to the first embodiment of the present invention.

  The optical disc apparatus 1 records and reproduces information on an optical disc 40 as an information recording medium such as a DVD (Digital Versatile Disc) -R / RW and an HD (High Definition) -DVD-R / RW. The optical disc 40 has grooves concentrically or spirally formed. The concave portion of the groove is called a land, the convex portion is called a groove, and one round of the group or land is called a track. User data is recorded on the optical disk 40 by irradiating intensity-modulated laser light along the tracks (grooves only or grooves and lands) to form recording marks. Data reproduction is performed by irradiating a laser beam with a weaker read power (Read Power) than at the time of recording along a track and detecting a change in reflected light intensity caused by a recording mark on the track. The recorded data is erased by irradiating a laser beam with erase power (Erase Power) stronger than the read power along the track to crystallize the recording layer.

  The optical disk 40 is rotationally driven by the spindle motor 2. A rotation angle signal is output from the rotary encoder 2 a attached to the spindle motor 2 to the spindle motor drive circuit 3. When the spindle motor 2 makes one rotation, for example, five pulses of the rotation angle signal are generated. Thus, the spindle motor control circuit 4 can determine the rotation angle and the rotation speed of the spindle motor 2 based on the rotation angle signal input from the rotary encoder 2a via the spindle motor drive circuit 3. The spindle motor 2 is controlled by a spindle motor control circuit 4.

  Information is recorded on or reproduced from the optical disc 40 by the optical pickup 5. The optical pickup 5 is connected to a feed motor 20 via a gear 18 and a screw shaft 19, and this feed motor 20 is controlled by a feed motor drive circuit 21. The optical pickup 5 moves in the radial direction of the optical disk 40 by the feed motor 20 being rotated by the feed motor drive current supplied from the feed motor drive circuit 21.

  The optical pickup 5 is provided with an objective lens 6 supported by a wire or a leaf spring (not shown). The objective lens 6 can be moved in the focusing direction (lens optical axis direction) by driving the focus actuator 8, and can be moved in the tracking direction (direction orthogonal to the optical axis of the lens) by driving the tracking actuator 7. Is possible.

  The laser control circuit 17 is a recording laser control circuit (not shown) that generates a laser control signal for controlling the laser diode 9 during recording, and a reproduction that generates a laser control signal for controlling the laser diode 9 during reproduction. It consists of a laser control circuit (not shown), and recorded data (modulated by the EFM modulation method or the like in the modulation circuit 34) supplied from the host device 41 via the interface circuit 39 during information recording (mark formation). Based on the recording data, a writing signal is supplied to the laser diode (laser light emitting element) 9. Further, the laser control circuit 17 supplies a read signal smaller than the write signal to the laser diode 9 when reading information. The laser control circuit 17 is preset with edge timing fine adjustment information for each code length pattern, which is called a write strategy used when recording user data on the optical disc 40, and this edge timing fine adjustment information. The laser drive current (laser control signal) whose edge timing is adjusted based on the above is output to the laser diode 9.

  The front monitor photodiode 10 branches a part of the laser light generated by the laser diode 9 by a half mirror 11 by a certain ratio, detects a light reception signal proportional to the light amount, that is, the irradiation power, and converts the detected light reception signal into a laser. This is supplied to the control circuit 17. The laser control circuit 17 acquires the light reception signal supplied from the front monitor photodiode 10, and based on the acquired light reception signal, the laser power (irradiation power) during reproduction preset by a CPU (Central Processing Unit) 38 ), The laser diode 9 is controlled to emit light with the laser power at the time of recording and the laser power at the time of erasing.

  The laser diode 9 emits laser light in accordance with a signal supplied from the laser control circuit 17. Laser light emitted from the laser diode 9 is irradiated onto the optical disk 39 through the collimator lens 12, the half prism 13, and the objective lens 6. The reflected light from the optical disk 40 is guided to the photodetector 16 through the objective lens 6, the half prism 13, the condenser lens 14, and the cylindrical lens 15.

  The light detector 16 includes, for example, a four-divided light detection cell, generates a detection signal, and outputs the generated detection signal to the RF amplifier 23. The RF amplifier 23 processes the detection signal from the light detector 16, and performs a focus error signal (FE) indicating an error from the just focus, and a tracking error signal (TE) indicating an error between the laser beam spot center and the track center. ), And a reproduction signal (RF) that is a full addition signal of the detection signal, and the generated focus error signal (FE), tracking error signal (TE), and reproduction signal (RF) are converted into an A / D converter 30. To supply.

  In addition, the RF amplifier 23 generates a push-pull signal and supplies the generated push-pull signal to the wobble processing unit 33. The wobble processing unit 33 generates a wobble signal from the push-pull signal supplied from the RF amplifier 23 and generates a recording clock based on the generated wobble signal. The write strategy changes according to the change of the data recording rate according to the recording clock.

  The focus control circuit 25 generates a focus control signal according to the focus error signal (FE) fetched from the RF amplifier 23 via the A / D converter 30, and the generated focus control signal is used as the focus actuator drive circuit 24. To supply. The focus actuator drive circuit 24 supplies a focus actuator drive current for driving the focus actuator 8 to the focus actuator 8 in the focusing direction based on the focus control signal supplied from the focus control circuit 25. Thus, focus servo is performed in which the laser beam is always just focused on the recording film of the optical disc 40.

  The track control circuit 27 generates a tracking control signal according to the tracking error signal (TE) fetched from the RF amplifier 23 via the A / D converter 30, and the generated tracking control signal is used as the tracking actuator drive circuit 26. To supply. The tracking actuator driving circuit 26 supplies a tracking actuator driving current for driving the tracking actuator 7 to the tracking actuator 7 in the tracking direction based on the tracking control signal supplied from the tracking control circuit 27. As a result, tracking servo is performed in which the laser beam always traces the track formed on the optical disc 40.

  By performing such focus servo and tracking servo, the reproduction signal (RF), which is a full addition signal of the detection signal from the light detector 16 (each light detection cell), corresponds to the recording information in the optical disc 40. Changes in the reflected light from the pits formed on the track are reflected. This reproduction signal is a weak analog signal, amplified by the RF amplifier 23, sampled at a constant frequency by the A / D converter 30, and then supplied to the data reproduction circuit 31. The data reproduction circuit 31 corrects the amplitude and offset of the reproduction signal supplied from the A / D converter 30 and makes a signal synchronized with the reproduction clock signal by a PLL (Phase Locked Loop) circuit 29. And then output to the error correction circuit 32.

  The CPU 36 performs various arithmetic processes on the digital signals such as the focus error signal (FE) and the tracking error signal (TE) which are output from the RF amplifier 23 and then converted into digital signals via the A / D converter 30. The spindle motor control circuit 4, the feed motor control circuit 22, the focus control circuit 25, and the tracking control circuit 27 are controlled.

  The laser control circuit 17, the PLL circuit 29, the A / D converter 30, the error correction circuit 32, and the like are controlled by the CPU 36 via the bus 35. The CPU 36 follows an operation command supplied from the host device 41 via the interface circuit 39 and also follows a program stored in a ROM (Read Only Memory) 37 and a program loaded from the ROM 37 to a RAM (Random Access Memory) 38. Various processes are executed, various control signals are generated, and are supplied to the respective units, whereby the optical disc apparatus 1 is comprehensively controlled.

  FIG. 2 shows an internal configuration of the wobble processing unit 33 of FIG.

  As shown in FIG. 2, the wobble processing unit 33 includes a wobble signal generation unit 51, a first frequency divider 52, a phase comparator 53, an LPF (Low Pass Filter) 54, a VCO (Voltage Controlled Oscillator) 55, 2 frequency divider 56, third frequency divider 57, WAP (Wobble Address in Periodic Position) address counter 58, recording data address counter 59, and error detector 60.

  The wobble signal generation unit 51 generates a wobble signal from the push-pull signal supplied from the RF amplifier 23, outputs the generated wobble signal to the first frequency divider 52, and outputs the generated wobble signal to the WAP address. Output to the counter 58.

  The first frequency divider 52 is, for example, a 12 frequency divider and the like. The first frequency divider 52 divides the wobble signal input from the wobble signal generation unit 51 by N, and outputs the N frequency divided signal to the phase comparator 53. The phase comparator 53 outputs an error signal corresponding to the frequency and phase shift of the N-divided signal input from the first frequency divider 52 and the L-divided signal input from the third frequency divider 57. The generated error signal is output to the LPF 54.

  The LPF 54 generates a VCO control signal by cutting the high frequency component of the error signal input from the phase comparator 53, and outputs the generated VCO control signal to the VCO 55. The VCO 55 is, for example, a voltage controlled oscillator, and changes the frequency fvco of the VCO output signal based on the VCO control signal input from the LPF 54 and outputs the VCO output signal with the changed frequency fvco to the second frequency divider 56. To do.

  The second frequency divider 56 is, for example, a frequency divider of 2, and the like. The second frequency divider 56 divides the VCO output signal input from the VCO 55 by M and outputs the M-divided signal to the bus 35 as a recording clock (2 channel clock). At the same time, it is also output to the third frequency divider 57. The third frequency divider 57 is, for example, a 588 (± 1) frequency divider, etc., and divides the M frequency division signal input from the second frequency divider 56 by L, and the L frequency division signal is phase-shifted. Output to the comparator 53.

  The WAP address counter 58 sequentially detects the WAP address using the wobble signal input from the wobble signal generation unit 51, and outputs the detected WAP address to the error detector 60. The recording data address counter 59 detects a recording data address included in the recording data and outputs the detected recording data address to the error detector 60.

  Each time the WAP address is detected, the error detector 60 compares the WAP address input from the WAP address counter 58 with the recording data address input from the recording data address counter 59 and sets in advance between the two addresses. It is determined whether or not there is a deviation larger than the predetermined reference value (for example, ± 3 bytes).

  When the error detector 60 determines that there is a deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, the determination instruction signal indicating the determination result to that effect And the generated determination instruction signal is output to the third frequency divider 57.

  Next, a recording clock generation process in the optical disc apparatus 1 of FIG. 1 will be described. This recording clock generation process is started at the time of recording when recording data is recorded on the optical disc 40.

  In step S1, when recording the recording data on the optical disc 40, the wobble signal generation unit 51 generates a wobble signal from the push-pull signal supplied from the RF amplifier 23, and the generated wobble signal is a first frequency divider. The generated wobble signal is output to the WAP address counter 58.

  The WAP address counter 58 sequentially detects the WAP address using the wobble signal input from the wobble signal generation unit 51, and outputs the detected WAP address to the error detector 60.

  In step S <b> 2, the recording data address counter 59 detects a recording data address included in the recording data, and outputs the detected recording data address to the error detector 60.

  In step S3, every time a WAP address is detected, the error detector 60 compares the WAP address input from the WAP address counter 58 with the recording data address input from the recording data address counter 59, and outputs two addresses. It is determined whether or not there is a deviation larger than a predetermined reference value (for example, ± 3 bytes) set in advance.

  That is, for example, when recording an HD DVD, the recording start position of the data block is determined in advance 24 wobbles from the beginning of the physical segment, and a deviation of ± 3 bytes is allowed for the recording start position of this data block. Therefore, it is determined whether or not there is a deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address.

  The predetermined reference value may be changed as appropriate according to the type of the optical disc 40 and the like.

  When it is determined in step S3 that there is a deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, the error detector 60 determines the result of that. Is generated, and the generated determination instruction signal is output to the third frequency divider 57.

  In step S4, the third frequency divider 57, based on the determination instruction signal input from the error detector 60, sets a predetermined reference value (for example, 3 bytes) preset between the WAP address and the recording data address. For example, and the clock division number when dividing the M divided signal is changed from L division to L ± 1 division, for example, with the changed clock division number. The M frequency-divided signal is frequency-divided, and the L ± 1 frequency-divided signal is output to the phase comparator 53.

  More specifically, for example, there is a deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, and the WAP address is more than +3 bytes than the recording data address. If the frequency difference is too large, the clock frequency division frequency when dividing the M frequency division signal is changed from the L frequency division to the L-1 frequency division, and the M frequency division signal is divided by the changed clock frequency division number. Then, the L-1 frequency-divided signal is output to the phase comparator 53.

  On the other hand, for example, there is a deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, and the WAP address is larger than the recording data address by more than −3 bytes. In this case, the clock frequency division frequency when dividing the M frequency division signal is changed from L frequency division to L + 1 frequency division, and the M frequency division signal is divided by the changed clock frequency division number. The circumferential signal is output to the phase comparator 53.

  Of course, in addition to changing the number of clock divisions when dividing the M division signal from, for example, L division to L ± 1 division, for example, from L division to division other than L ± 1 division, for example. It may be changed. That is, it is only necessary to change the clock frequency division number so that the difference between the two addresses (WAP address and recording data address) is eliminated.

  In step S5, the phase comparator 53, the LPF 54, the VCO 55, and the second frequency divider 56 generate a recording clock using the L ± 1 frequency division signal with the changed clock frequency division number. That is, the phase comparator 53 responds to a frequency and phase shift between the N-divided signal input from the first frequency divider 52 and the L ± 1 frequency-divided signal input from the third frequency divider 57. The generated error signal is generated, and the generated error signal is output to the LPF 54.

  The LPF 54 generates a VCO control signal by cutting the high frequency component of the error signal input from the phase comparator 53, and outputs the generated VCO control signal to the VCO 55. The VCO 55 changes the frequency fvco of the VCO output signal based on the VCO control signal input from the LPF 54, and outputs the VCO output signal with the changed frequency fvco to the second frequency divider 56. The second frequency divider 56 divides the VCO output signal input from the VCO 55 by M, and outputs the M-divided signal to the bus 35 as a recording clock (2 channel clock).

  As a result, even when recording data (user data) is recorded on the optical disc 40, an abnormality occurs in the generation of the wobble signal due to a defect or the like occurring in the optical disc 40, and a slight fluctuation occurs in the recording clock. Even in this case, the clock frequency division number can be changed so that the difference between the two addresses (WAP address and recording data address) can be eliminated, and the recording clock can be generated using the changed clock frequency division number. .

  Accordingly, synchronization between the WAP address and the recording data address (synchronization of physical segment and data block position) can be maintained within a predetermined standard. In particular, in the present invention, it is possible to apply the correction of the recording clock, which was conventionally limited only to the synchronization of the WAP address and the recording data address at the time of DVD-R / RW recording, to the time of HD DVD recording It becomes.

  On the other hand, if it is determined in step S3 that there is no deviation larger than a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, the error detector 60 notifies that. The determination instruction signal indicating the determination result is generated, and the generated determination instruction signal is output to the third frequency divider 57.

  In step S6, the third frequency divider 57 is based on a determination instruction signal input from the error detector 60, and a predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address. The frequency division number of the M divided signal is divided by L without changing the clock division number when dividing the M divided signal from L divided. The peripheral signal is output to the phase comparator 53.

  In step S7, the phase comparator 53, the LPF 54, the VCO 55, and the second frequency divider 56 generate a recording clock using the L frequency division signal. That is, the phase comparator 53 is an error corresponding to the frequency and phase shift between the N-divided signal input from the first frequency divider 52 and the L-divided signal input from the third frequency divider 57. A signal is generated, and the generated error signal is output to the LPF 54.

  The LPF 54 generates a VCO control signal by cutting the high frequency component of the error signal input from the phase comparator 53, and outputs the generated VCO control signal to the VCO 55. The VCO 55 changes the frequency fvco of the VCO output signal based on the VCO control signal input from the LPF 54, and outputs the VCO output signal with the changed frequency fvco to the second frequency divider 56. The second frequency divider 56 divides the VCO output signal input from the VCO 55 by M, and outputs the M-divided signal to the bus 35 as a recording clock (2 channel clock).

  Thereafter, the process returns to step S1, and the processes after step S1 are repeatedly executed.

  In the embodiment of the present invention, the WAP address is sequentially detected, the recording data address is detected, and a predetermined reference value (for example, 3 bytes) set in advance between the detected WAP address and the recording data address. When it is determined whether there is a deviation larger than the predetermined reference value (for example, 3 bytes) set in advance between the WAP address and the recording data address, The number of clock divisions when dividing the M-divided signal can be changed from L division to L ± 1 division, for example. The recording clock can be generated using the changed clock frequency division number.

  As a result, even when recording data (user data) is recorded on the optical disc 40, an abnormality occurs in the generation of the wobble signal due to a defect or the like occurring in the optical disc 40, and a slight fluctuation occurs in the recording clock. Even in this case, the clock frequency division number can be changed so that the difference between the two addresses (WAP address and recording data address) can be eliminated, and the recording clock can be generated using the changed clock frequency division number. .

  As a result, a suitable recording clock can be generated even when a defect occurs in the disc.

  Accordingly, synchronization between the WAP address and the recording data address (synchronization of physical segment and data block position) can be maintained within a predetermined standard. In particular, in the present invention, it is possible to apply the correction of the recording clock, which was conventionally limited only to the synchronization of the WAP address and the recording data address at the time of DVD-R / RW recording, to the time of HD DVD recording. It becomes. As described above, the recording quality of the optical disc 40 can be improved.

  The series of processes described in the embodiments of the present invention can be executed by software, but can also be executed by hardware.

  In the embodiment of the present invention, the steps of the flowchart show an example of processing that is performed in time series in the order described. However, even if they are not necessarily processed in time series, they are executed in parallel or individually. The processing to be performed is also included.

1 is a block diagram showing an internal configuration of an optical disc apparatus according to the present invention. The block diagram which shows the internal structure of the wobble process part of FIG. 3 is a flowchart for explaining a recording clock generation process in the optical disc apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical disk apparatus, 2 ... Spindle motor, 2a ... Rotary encoder, 3 ... Spindle motor drive circuit, 4 ... Spindle control circuit, 5 ... Optical pick-up, 6 ... Objective lens, 7 ... Tracking actuator, 8 ... Focus actuator, 9 ... Laser diode, 10 ... Front monitor photodiode, 11 ... Half mirror, 12 ... Collimator lens, 13 ... Half prism, 14 ... Condensing lens, 15 ... Cylindrical lens, 16 ... Photo detector, 17 ... Laser drive circuit, 18 DESCRIPTION OF SYMBOLS ... Gear, 19 ... Screw shaft, 20 ... Feed motor, 21 ... Feed motor drive circuit, 22 ... Feed motor control circuit, 23 ... RF amplifier, 24 ... Focus actuator drive circuit, 25 ... Focus actuator control circuit, 26 ... Tracking actuator 27, tracking control circuit, 28 ... crystal, 29 ... PLL circuit, 30 ... A / D converter, 31 ... data recovery circuit, 32 ... error correction circuit, 33 ... wobble processing unit, 34 ... modulation circuit, 35 ... bus, 36 ... CPU, 37 ... ROM, 38 ... RAM, 39 ... interface circuit, 40 ... optical disk, 41 ... host device, 51 ... wobble signal generator, 52 ... first frequency divider, 53 ... phase comparison 54 ... LPF, 55 ... VCO, 56 ... second frequency divider, 57 ... third frequency divider, 58 ... WAP address counter, 59 ... recording data address counter, 60 ... error detector.

Claims (4)

First detection means for detecting a first address based on wobble formed on the optical disc;
Second detection means for detecting a second address included in the recording data;
The first address detected by the first detection means is compared with the second address detected by the second detection means, and the first address and the second address are compared. Determining means for determining whether or not there is a deviation larger than a predetermined reference value set in advance,
Changing means for changing a clock frequency division number when it is determined by the determining means that there is a deviation larger than a predetermined reference value set in advance between the first address and the second address; ,
An optical disc apparatus comprising: a generating unit configured to generate a recording clock used when recording data on the optical disc using the clock frequency division number changed by the changing unit.   2. The optical disc apparatus according to claim 1, wherein the first address is a WAP address, and the second address is a recording data address.   When the determination unit determines that there is no deviation larger than a predetermined reference value set in advance between the first address and the second address by the determination unit, the clock division number The optical disk apparatus according to claim 1, wherein the optical disk apparatus is not changed. A first detection step of detecting a first address based on the wobble formed on the optical disc;
A second detection step of detecting a second address included in the recording data;
The first address detected by the process of the first detection step is compared with the second address detected by the process of the second detection step, and the first address and the second address are compared. A determination step of determining whether there is a deviation larger than a predetermined reference value set in advance between
Change to change clock division number when it is determined by processing of the determination step that there is a deviation larger than a predetermined reference value set in advance between the first address and the second address Steps,
An optical disc recording method comprising: a generation step of generating a recording clock used when recording the recording data on the optical disc using the clock frequency division number changed by the processing of the changing step.

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