JP3044989B2 - Optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device,
In particular, the present invention relates to an optical disk device that records digital image data and other digital data (such as audio data and system data) on an optical disk (including a magneto-optical disk) rotating at a constant angular velocity at a constant recording wavelength.

[0002]

2. Description of the Related Art As a recording method of an optical disk, a CWL (Constant Wave Length) capable of performing high-density recording and easily realizing a high-speed search at the time of reproduction.
h)-CAV (Constant Angular V)
(e.g., occupancy) method. In this method, recording is performed at a constant recording wavelength while keeping the rotation speed of the optical disk constant.

As shown in FIG. 5, a conventional CWL-CAV type optical disk apparatus uses an optical disk 21 capable of recording on both sides and rotates the optical disk 21 at a constant angular velocity. The optical head 22 is moved from the outer circumference to the inner circumference of the optical disc 21 while the other optical head 23 is simultaneously moved from the inner circumference to the outer circumference of the optical disc 21 to record data. . In this case, the distance from the center of the optical disk to each optical head is detected, and the peripheral speed ratio of the track where the optical heads 22 and 23 are located is determined.
Recording is performed at a constant recording wavelength by allocating data based on the track peripheral speed ratio so that the total bit rate of the recording data supplied to 3 is always constant.

Here, a case where data is recorded on a double-sided optical disc having a diameter of 30 cm will be described as an example.

The outermost diameter of the recording area of the optical disk is 2
The recording area of the optical disk is equally divided into 103 in the radial direction, and recording is performed at the same bit rate in each divided area. The optical disk rotates at a constant angular velocity, and the peripheral speed is proportional to the distance from the center. Therefore, the peripheral speed on the outer peripheral side is faster than the peripheral speed on the inner peripheral side.

[0006] The optical heads on the front and back sides simultaneously move, and as shown in FIG.
As shown in the figure, it is assumed that the peripheral speed ratio in the region where each optical head is located changes to 103 stages as the stage changes from stage 0 to stage 102. Here, one frame is controlled by controlling the data distribution so that the data distribution amount of the optical head on the outer peripheral side is increased and the data distribution amount of the optical head on the inner peripheral side is reduced in accordance with the peripheral speed ratio. The recording data of the minute can be recorded at a substantially constant recording wavelength on one round of the front and back sides.

Now, the recording data amount for one frame is set to 26
There are 44 sync blocks. Here, the sync block (S
The abbreviation B) is, for example, a data string composed of a total of 192 bytes including a synchronization signal of 2 bytes, an ID signal of 2 bytes indicating an address, data of 172 bytes, and an error correction code of 16 bytes.

First, at the start of recording, the front side optical head 12 is located on a track having a diameter of 28.9000 cm, the rear side optical head 23 is located on a track having a diameter of 15.0568 cm, and the peripheral speed ratio is as follows. 28.9000 / 15.05
68 ≒ 1730/914. Therefore, in the stage 0, 1 out of the recording data 2644SB for one frame is recorded.
730SB is allocated to the front side optical head, and the remaining 914SB is allocated.
Are distributed to the back side optical head. That is, the front side optical head 22 writes 1730 SB per track in the track area of 28.9000 to 28.7656 cm. On the other hand, the back side optical head 23 is 15.0568 to 1
5. Write 914 SB per track in a 1912 cm track area.

Thereafter, as the optical heads on the front and back sides move, respectively, and change from step 0 to step 102 every 1.344 mm, the data distribution amount of the front side optical head becomes 8S.
The data distribution amount of the back side optical head gradually decreases by 8SB at the same time. In the final stage 102, the data distribution amount to the front side optical head is 1730 SB, and the data distribution amount to the rear side optical head is 9
14 SB. In this way, data is recorded at a constant recording wavelength by controlling data distribution according to the peripheral speed ratio.

[0010]

As described above, conventionally, in order to record data on an optical disk by the CWL-CAV method, an optical disk capable of recording on both sides is used, and an optical head is provided on the front side and the back side of the optical disk. Are provided respectively. Therefore, an optical disk capable of double-sided recording and two optical heads are required, and since the optical heads on both front and rear sides must be synchronized at the time of reproduction, there are problems in cost, mechanical accuracy, and the like.

An object of the present invention is to provide an optical disk apparatus capable of recording data at a constant recording wavelength on an optical disk rotating at a constant angular velocity by using one optical head in order to solve such a problem. is there.

[0012]

An optical disk apparatus according to the present invention is an optical disk apparatus for recording data at a substantially constant recording wavelength using one optical head on an optical disk rotating at a constant angular velocity. When the storage area is divided equally into n + 1 (n is an integer of n ≧ 1) in the radial direction and the track areas from the innermost 0th to the outermost nth are set, the optical head When it is located in the No. 0 track area, the predetermined recording data amount per track is A (A is the data amount of one frame divided by A).
Ri and satisfies a positive integer) that expires, the track territory each time said optical head moves to the next track area
The recording data amount per track in the area is ΔA (ΔA
Is a positive integer satisfying the condition that A is divisible by ΔA.
Comprising means for generating the recording data so as to increase by several), the recording data amount A and ΔA is the m (m
Is an integer that satisfies n ≧ m ≧ 0).
And the track diameter at the innermost circumference in the track area
Is selected so that the ratio with the recording data amount per track (A + ΔA · m) becomes as constant as possible.

An optical disk device according to the present invention is an optical disk device for recording data at a substantially constant recording wavelength using one optical head on an optical disk rotating at a constant angular velocity. When n + 1 (n is an integer of n ≧ 1) equally divided in the radial direction to set a track area from the nth outermost circumference to the 0th innermost circumference,
When the optical head is located in the n-th track area, the predetermined recording data amount per track is B (B is obtained by dividing the data amount of one frame by B).
A positive integer that satisfies the above condition), and each time the optical head moves to the next track area ,
The recording data amount per rack is ΔB (ΔB is B
Comprising means for generating the recording data so as to reduce by satisfying a positive integer) that are divisible by, the Symbol
The recorded data amounts B and ΔB are the m-th (m is an integer satisfying n ≧ m ≧ 0) track diameter at the innermost circumference in the track area and one track in the track area.
The recording data amount (B−ΔB · m) is selected so as to be as constant as possible.

[0014] In the above structure, when the recording input data by performing predetermined recording data processing such as image audio integration and error correction code addition generates print data of the m-th track areas, the recording on one track period The recording data processing is performed at a speed (clock frequency) at which the data amount A can be processed and temporarily written into the recording data memory, and then the recording data is read at a recording speed (clock frequency) at which the recording data can be recorded to generate the recording data. In this case, the recording data amount A per track in the track area A
Means for interrupting reading from the recording data memory and recording on the optical disk for one track period each time the integrated value of the difference between the data and (A + ΔA · m) reaches the recording data amount A.

In the above-mentioned configuration, when the reproduction data read from the m-th track area is subjected to predetermined reproduction data processing such as error correction or image / audio separation to generate reproduction output data, once written to playback data memory at a speed of reproducing the reproduction data (clock frequency), reading said reproduction data processing rate thereafter capable of processing the recording data <br/> data amount a on one track period (clock frequency) To generate the reproduction output data. In this case, one track in the track area is generated.
Means for returning the track by one track and reading the reproduction data again from the optical disk each time the integrated value of the difference between the recording data amount A per disc and (A + ΔA · m) reaches the recording data amount A. doing.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Here, the optical disk 1 is driven by the disk drive unit 11 and rotates at a constant angular velocity. Optical head 2
Is moved in the radial direction from the inner circumference to the outer circumference of the optical disc 1 by being driven by the head driving unit 3, and the recording data Dw
2 is written on the optical disk 1, and data recorded on the optical disk 1 is read out and output as reproduced data Dr1.

The track position detector 4 receives the position information P1 from the optical head 2 and outputs a signal P2 indicating the position of the track. By the way, as a method of detecting the track position, a method of mechanically reading and detecting the position of the optical head 2 or a method of previously recording track address information on the optical disk 1 and reading and detecting this track address information. Although there are methods and the like, any method may be used.

The recording control signal generator 5 outputs a recording clock signal Cw1 and a pause track control signal Cw2 based on the track position signal P2. The recording data processing unit 6 subjects the recording input data Dw1 to processing such as image / audio integration, shuffling, addition of an error correction code, modulation, and synchronization at a predetermined speed in predetermined data units, and temporarily stores the data in the recording data memory 7. At the same time, the data is read from the recording data memory 7 in accordance with the recording clock signal Cw1 and the pause track control signal Cw2 to generate the recording data Dw2, and outputs the recording data Dw2 to the optical head 2.

The reproduction control signal generator 8 outputs a reproduction clock signal Cr1 and a repeat track control signal Cr2 based on the track position signal P2. The reproduction data processing unit 9 writes the reproduction data Dr1 read by the optical head 2 into the reproduction data memory 10 once in accordance with the reproduction clock signal Cr1 and the repeat track control signal Cr2, and also writes the reproduction data Dr1 into the data read from the reproduction data memory 10. On the other hand, it performs processing such as synchronization detection and demodulation, error correction, deshuffling, and audio / video separation at a predetermined speed in predetermined data units, and sends out the reproduced output data Dr2.

Next, the operation will be described with reference to an example in which a magneto-optical disk having a diameter of 13 cm is used.

If the innermost diameter of the recording area of the magneto-optical disk is 60.0 mm, the outermost diameter is 120.6 mm, and the track pitch is 0.6 μm, the total number of tracks in the recording area is 50500. Become. This recording area is equally divided into 101 in the radial direction, and each divided area is called a clock block and is abbreviated as “CB”, so that the number of tracks per CB is 500. If the innermost clock block is CB0, the optical head 2 moves from CB0 to the outermost CB100.

The data D to be recorded on the magneto-optical disk
w2 quantizes a television signal of the current television system with a frame frequency of 30 / 1.001 Hz and 525 lines per frame to 8 bits at a sampling frequency of 13.5 MHz, and then, for example, a fixed length within a frame The data is compressed by encoding, and further, audio data, an error correction code, synchronization and the like are added to form a data string of 192 bytes. Here, each data string of 192 bytes is called a sync block (abbreviated as SB), and the recording data amount for one frame is 800 SB. Also, half of the recording data amount for one frame, that is, 400 SB is called a half frame (abbreviated as HF). The half frame does not always match the data amount of one field of the television signal, and has a different concept. Such recording data D
If the average bit rate of w2 is obtained, 800 [SB] ×
192 [bytes] x 8 [bits] x 30 / 1.001
[Hz] ≒ 36.827 [megabits / s].

Now, the optical head 2 is 60 / 1.001r
Data Dw2 is sequentially recorded on the magneto-optical disk rotating at a constant speed of ps from the innermost track.
In this case, as shown in FIG. 2, 1 HF (400 SB) is recorded per track in the innermost CB0, and the recording data amount per track is increased by 4 SB each time the next clock block is moved. In the outer CB100, 1
One frame (800 SB) is recorded on the track. That is, the average peripheral speed in the CB100 is twice as large as the average peripheral speed in the CB0. However, the recording data amount per track in the CB100 is made twice as large as the CB0 to keep the recording wavelength constant.

As shown in FIG. 2, CB0 has a diameter of 6
It is a recording area of 0.0 to 60.6 mm and has 500 tracks, and records 1 HF (400 SB) data per track. Therefore, 500 HF, that is, 250 frames can be recorded in the entire CB0. Further, the frequency f ₀ of the recording clock signal Cw1 in CB0 uses a 1,7 code, and when a track address, a redundant area for track jump, and the like are ignored, f ₀ = 400 × 192 × 8 × 60/1. 001 × 1.5
≒ 55.2 MHz. Further, the shortest recording wavelength Lw ₀ is Lw ₀ = (π × 60) / (400 × 192 × 8) ≒ 0.
307 μm.

CB1 has a diameter of 60.6 to 61.2 m
m, a recording area having 500 tracks, and 1 HF + 4 SB data is recorded per track. Therefore, 505 HF, that is, 252.5 frames can be recorded in the entire CB1. The frequency f ₁ of the recording clock in CB1 is f ₁ = 404 × 192 × 8 × 60 / 1.001 × 1.5
≒ 55.8 MHz. Further, the shortest recording wavelength Lw ₁ is Lw ₁ = (π × 60.6) / (404 × 192 × 8) ≒
0.307 μm.

In the same manner, the recording data amount per track increases by 4 SB each time the head moves to the next CB, and 1 HF + 400 S per track in the outermost CB 100.
B, that is, data for one frame is recorded. The frequency f _{100 of the} recording clock is f ₁₀₀ = 800 × 192 × 8 × 60 / 1.001 × 1.
5 ≒ 110.5 MHz. Further, the shortest recording wavelength Lw ₁₀₀ is Lw ₁₀₀ = (π × 120) / (800 × 192 × 8) ≒
0.307 μm.

As described above, by changing the recording clock frequency for each clock block, the shortest recording wavelength of each clock block can be made constant. Incidentally, the total recording data amount of this magneto-optical disk is 75750 HF.

By the way, the recording area of the optical disk whose innermost track diameter is Li is defined as n + 1 (n is n
Integer of ≧ 1) equally divided into widths ΔL with the innermost peripheral area as CB0
Areas CB0 to CBn are set, and 1 in CB0 is set.
If the amount of recording data per track is A and the amount of recording data is increased by ΔA each time the disk moves to the next area, the area C
The shortest recording wavelength per data in Bm (m is an integer satisfying n ≧ m ≧ 0) can be expressed by equation (1). The shortest recording wavelength in CBm = π · (Li + ΔL · m) / (A + ΔA · m) (1) Therefore, according to equation (1), A and ΔA are set so that the shortest recording wavelength in each area is as constant as possible. What is necessary is just to select each. In this case, A represents the data amount of one frame as A
A positive integer satisfying the condition of being divisible, ΔA is
A is a positive integer satisfying the condition that it is divisible by ΔA.
By separating tracks and frames
Since the probability of matching with the eyes is maximized, images during special playback
The quality can be improved and the non-linear editing can be facilitated.
In addition, the cue-up speed can be reduced.

It is apparent that the same result can be obtained even if the optical head moves from the outermost circumference to the inner circumference of the optical disk. In this case, the outermost track diameter is Lo, and the recording area is n + 1 (n is n
≧ 1 (integer of 1), the outermost peripheral area when equally divided is CBn,
If the recording data amount per track in CBn is B, and the recording data amount is decreased by ΔB each time the optical disk moves to the next area, the shortest recording wavelength per data in the area CBm is expressed by Expression (2). be able to. The shortest recording wavelength in CBm = π · (Lo−ΔL · m) / (B−ΔB · m) (2) Therefore, according to the equation (2), the shortest recording wavelength in each region is made as constant as possible. B and ΔB may be selected respectively.

Next, the process of generating the recording data Dw2 will be described.

The recording data processing section 6 stores the recording input data D
For w1, recording data processing such as image / sound integration, shuffling, and addition of an error correction code are performed at equal time intervals in units of 1 HF, and once written to the recording data memory 7, and in accordance with the recording clock signal Cw1 and the pause track control signal Cw2. To read out from the recording data memory 7 to generate the recording data Dw2.

First, in CB0, each of tracks # 0 to # 4
Recording data Dw2 for 1 HF per track for 99
It is sufficient sends, reads in response to the write clock signal Cw1 in FIG write once recording the data memory 7 the processed data at the timings (a), the frequency f _0. Here, as the unit of the time transition, the time of 1 HF of the recording input data Dw1 is used, and each HF is assigned a serial number.

In the next CB1, 1 HF + 4 per track
To deliver SB recording data, reading data from a recording data memory 7 by the recording clock frequency f _1. In this case, as shown in FIG.
After read out by the recording clock frequency f ₁ for # 599, as shown by asterisks in the figure, interrupting recording the data read and the disc from only one track period recording data memory 7, and thereafter, Reading of data from track # 600 and recording on the disc are resumed. Here, this interruption operation is called a “pause track”.

This pause track is performed in order to adjust the data processing speed in the recording data processing section 6 to the recording data speed. That is, while the data processing speed in the recording data processing unit 6 is 1 HF during one track period,
The recording data speed is 1 HF + 4 SB in one track period, and therefore, is 4 per data processing period for 100 tracks.
The processing time of 00SB (1HF) is insufficient. For this reason,
The timing is adjusted by suspending recording on the disk for one track period for every 100 tracks.
In B1, tracks # 600, # 700, # 800, #
At 900, a total of four pause tracks are performed.
In this pause track, the head drive unit 3
Controls the optical head 2 according to the pause track control signal Cw2.

In CB2, as shown in FIG. 3B, in the first track # 1000, a pause track for every 100 tracks of the previous CB1 is executed, and then a total of 10 pause tracks are executed for every 50 tracks. That is, in order to transmit the recording data of 1HF + 8SB per track,
Since the recording data processing time of 400 SB (1 HF) is insufficient for every 50 tracks, tracks # 1050 and # 110
At 0, # 1150,..., # 1450, a pause track is performed.

Similarly, the k-th (k is 2 to 10)
In the clock block CBk of (an integer of 0), a total of 5 × k
Run the pause track. In the outermost CB 100, a pause track is performed for each track as shown in FIG. By performing the pause track in this manner, the data processing speed in the recording data processing unit 6 is adjusted to the recording data speed.

In general, the amount of data that can be processed in the recording data processing unit 6 during one track period is A, and the recording data per track in the k-th (k is an integer of 1 to 100) clock block CBk. Assuming that the amount is (A + ΔA · k), if a pause track is generated for each T track in CBk, equation (3) holds. .DELTA.A.k. (T + 1)> A.gtoreq..DELTA.A.k.T (3) If the optical disc is an overwrite medium, the operation is continued as it is when the pause track occurs, and one track is returned at the end of the pause track. Alternatively, the data after the recording data processing may be recorded. Also in this case, the optical head 2 is controlled by sending the pause track control signal Cr2 to the head driving unit 3.

Next, the generation processing of the reproduction output data Dr2 will be described.

The reproduction data processor 9 converts the reproduction data Dr1 read by the optical head 2 into a reproduction clock signal Cw.
1 and once written to the reproduction data memory 10,
For the data read from the reproduction data memory 10, 1
The reproduction data processing such as synchronization detection demodulation, error correction, and image / audio separation is performed at equal time intervals in HF units, and output as reproduction output data Dr2.

First, each of tracks # 0 to # 499 of CB0
From Since reproduction data Dr1 per track 1HF come is read by the optical head 2, at the timing shown in FIG. 4 (a), in accordance with the reproduction clock signal Cr1 of frequency f ₀ to the reproduced data memory 10 Normal writing / reading is performed to generate reproduced output data Dr2.

[0042] In the next CB1, as shown in FIG. 4 (a), since the reproduction data per track 1 HF + 4SB come sent, the playback data memory 10 by the reproduction clock signal Cw1 frequency f ₁ write, normal go read at a clock frequency f _0. In this case, tracks # 500 to #
For 599 of the reproduction data, after read out from the reproduction data memory 10 with the clock frequency f _1, as shown in% mark in the figure, one track back-track from the # 599 reads the data again data memory Write to 10. Such an operation of returning one track and reading twice consecutively from the same track is called a "repeat track".

This repeat track is performed in order to match the data processing speed in the reproduction data processing section 9 with the speed of the reproduction data Dr1. That is, as in the case of recording data generation, the reproduction data processing speed is 1 HF during one track period, whereas the reproduction data speed from CB1 is 1 HF + 4 SB during one track period. Therefore, 10
400 SB (1
Since the processing time of HF) is insufficient, the timing is adjusted by adjusting the time by one track period for every 100 tracks. In the entire CB1, tracks # 599,
In # 699, # 799, # 899, and # 999, a total of 5 repeat tracks are generated. At the time of this repeat track, the head driving unit 3 controls the optical head 2 according to the repeat track control signal Cr2.

In CB2, as shown in FIG. 4B, tracks # 1049, # 1099, # 1149,.
At 1499, a total of 10 repeat tracks occur every 50 tracks. Similarly, in each CBk (k is an integer of 1 to 99), a total of 5 × k repeat tracks are generated. In the outermost CB 100, as shown in FIG. 4B, repeat tracks are generated in 499 tracks (# 50000 to # 50498) excluding the last track # 50499. By generating a repeat track in this way, the data processing speed in the reproduction data processing unit 9 is adjusted to the reproduction data speed.

[0045]

As described above, according to the present invention, the storage area of the optical disk is equally divided in the radial direction into n + 1 (n is an integer equal to or more than 1), and the storage area is divided from the innermost 0 to the outermost 0. set the track area to No. n, the amount of data recorded per track of the 0th track region is a, as recording data amount for each moving to the next track area is increased by .DELTA.A, recording data The amounts A and ΔA are determined by the m-th (m is n ≧ m
By selecting such that the ratio between the track diameter and (A + ΔA · m) in the above-mentioned track area of the (integral number satisfying ≧ 0) number is as constant as possible, it is possible to provide an optical disk capable of double-sided recording and two Without using an optical head, recording data can be recorded at a substantially constant recording wavelength with a simple configuration using one optical head on an optical disk that rotates at a constant angular velocity. A is the data of one frame.
A positive integer that satisfies the condition that the data quantity is divisible by A
ΔA satisfies the condition that A is divisible by ΔA
By using a positive integer, track breaks and frame
Since the probability of the match with the
Non-linear editing can improve image quality during playback
Simplification and shortening of cue-up speed
it can.

When the recording input data is subjected to recording data processing such as image / audio integration and error correction code addition to generate recording data of the m-th track area,
During the track period, recording data processing is performed at the speed of the data amount A and once written into the recording data memory, and thereafter read at the recording data speed to generate recording data. In this case, the data amount A and the data amount (A + ΔA · m ), The reading from the recording data memory and the recording on the optical disk are interrupted for one track period each time the integrated value of the difference reaches the data amount A, so that the recording data processing speed can be adjusted to the recording data speed. .

Further, when reproduction data read out from the m-th track area is subjected to predetermined reproduction data processing such as error correction and video / audio separation to generate reproduction output data,
The reproduced data is once written in the reproduced data memory at the speed of the reproduced data, and thereafter read out at a speed of the data amount A in one track period and subjected to a predetermined reproduced data processing to generate the reproduced output data. Each time the integrated value of the difference between the data and the data amount (A + ΔA · m) reaches the data amount A, the reproduction data is read back from the optical disk by one track, and the reproduction data processing speed is adjusted to the reproduction data speed. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing an operation example when a magneto-optical disk having a diameter of 13 cm is used.

FIG. 3 is a diagram for explaining an operation of a print data processing unit 6 shown in FIG.

FIG. 4 is a diagram for explaining an operation of a reproduction data processing unit 9 shown in FIG.

FIG. 5 is a diagram showing an arrangement of an optical head of a conventional optical disk device.

FIG. 6 is a diagram for explaining the relationship between the position of the optical head shown in FIG. 5 and the data distribution amount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical head 3 Head drive part 4 Track position detection part 5 Recording control signal generation part 6 Recording data processing part 7 Recording data memory 8 Reproduction control signal generation part 9 Reproduction data processing part 10 Reproduction data memory Cr1 Reproduction clock signal Cr2 repeat Track control signal Cw1 Recording clock signal Cw2 Pause track control signal Dr1 Reproduction data Dr2 Reproduction output data Dw1 Recording input data Dw2 Recording data

Claims (4)

(57) [Claims] 1. An optical disk device for recording data at a substantially constant recording wavelength on an optical disk rotating at a constant angular velocity by using one optical head, wherein a storage area of the optical disk is radially divided by n + 1 (n is n
(Integer of ≧ 1) equally divided from the innermost 0th to the outermost nth
When the optical head is located in the No. 0 track area when a track area up to No. 1 is set, a predetermined value is set.
The amount of recording data per track obtained is A (A is 1
The condition that the data amount of the frame is divisible by A
And to a positive integer), the optical head per track of the track in the area for each moving to the next track area
When the recording data amount is ΔA (ΔA is obtained by dividing A by ΔA
Comprising means for generating the recording data to increments satisfies a positive integer) refers, the recording data amount A and ΔA is the m (m is an integer satisfying n ≧ m ≧ 0)
No. track diameter at the innermost circumference in the track area and recording data per track in the track area
An optical disc device characterized in that the ratio with the quantity (A + ΔA · m) is selected to be as constant as possible. 2. An optical disk device for recording data at a substantially constant recording wavelength on an optical disk rotating at a constant angular velocity by using one optical head, wherein a storage area of the optical disk is radially divided into n + 1 (n: n
(Integer of ≧ 1) equally divided from the outermost nth to the innermost 0th
When the optical head is located in the n-th track area when the track area up to the n-th track area is set, a predetermined value is set.
The B (B is the amount of data recorded per track is because, 1
The condition that the data amount of the frame is divisible by B
And to a positive integer), <br/> recording data amount .DELTA.B (.DELTA.B per track of the track area every time the optical head is moved to the next track area, the divisible B in .DELTA.B
Means for generating the recording data so as to decrease by a positive integer that satisfies the above condition , wherein the recording data amounts B and ΔB are m-th (m is an integer satisfying n ≧ m ≧ 0)
No. track diameter at the innermost circumference in the track area and recording data per track in the track area
An optical disc device characterized by being selected so that the ratio to the quantity (B-ΔB · m) is as constant as possible. 3. The optical disk device according to claim 1, wherein the recording input data is subjected to predetermined recording data processing such as image / audio integration or error correction code addition to generate recording data of said m-th track area. A speed (clock frequency) at which the recording data amount A can be processed in one track period;
The speed at which the recording data processing is performed and the data is once written in the recording data memory, and then the recording data can be recorded.
(Clock frequency) to generate the recording data. In this case, one track in the track area is generated.
Each time the integrated value of the difference between the recording data amount A per disc and (A + ΔA · m) reaches the recording data amount A, reading from the recording data memory and recording on the optical disk are interrupted for one track period. An optical disk device comprising means. 4. The optical disk device according to claim 1, wherein the reproduction data read from the m-th track area is subjected to predetermined reproduction data processing such as error correction and image / audio separation to generate reproduction output data. In the case, the reproduction data is reproduced at a speed (clock frequency) at which the reproduction data is reproduced.
) In the reproduction data memory, and then the speed (clock ) at which the recording data amount A can be processed in one track period.
So as to generate the reproduced output data by performing the read the reproduction data processing clock frequency), in this case, the tiger
Recording data amount A per track in the
+ ΔA · m) . An optical disc apparatus comprising means for returning the track by one track and reading the reproduced data from the optical disc again each time the integrated value of the difference from the difference from + ΔA · m) reaches the recording data amount A.