JP2000011378A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the number of rewritable times of the whole disk by averaging a recording frequency to a disk recording layer and reducing the recording fatigue of the same place when the data with synchronous information added are recorded on an optical disk beforehand recorded with the synchronous information, and the position of the synchronous information to be written is matched with the position of the beforehand recorded synchronous information. SOLUTION: This recorder is constituted so that when the recording data containing a synchronous pattern are recorded on the optical disk beforehand recorded with the synchronous pattern, write clocks more by a prescribed number (n) ((n) is a positive integer) than the number of write clocks required for the recording data to be recorded in a prescribed period are generated by a write clock generation part 6, and a recording start point of the optical disk is changed at random between 0 clock-(n) clocks by a timing delay circuit part 10, and the recording data are recorded by a laser control part 5 based on it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording device for recording information on an optical disk.

[0002]

2. Description of the Related Art Conventionally, an optical disk (hereinafter referred to as "DVD-R") as described in Japanese Patent Application Laid-Open No. 9-251710.
When no data is recorded, pre-pits (hereinafter referred to as “LP”) are formed in an area between grooves (called “land”) when data is not recorded.
P "). DVD like this
The LPP on -R indicates DVD-R synchronization information (synchronization pattern) and address information, and the synchronization information is recorded once in one sector.

A frame synchronization pattern is also added to a data pattern to be written on a DVD-R.
Append (or rewrite to rewritable disc)
Therefore, when a data pattern is recorded on the DVD-R, it is necessary to record the data so that the positions of the two synchronization patterns of the data synchronization pattern by LPP on the land and the synchronization pattern on the groove overlap.

[0004] For example, as shown in FIG.
It is necessary that the position of the LPP of the first bit and the position of the mark of 14T in the frame synchronization pattern added to the write data in the synchronization pattern on the land composed of PP overlap.

In order to achieve this, a conventional optical disk recording apparatus performs CLV control of disk rotation and generation of a write clock using wobble (WBL) recorded in advance on a DVD-R at the time of data recording. LP
Using P to correct the phase of the write clock,
The VD-R address information and synchronization information are extracted to control data writing.

FIG. 8 is a block diagram showing a configuration relating to data writing in a conventional general DVD-R drive. Note that, for simplicity of illustration, control signals from the controller are omitted in FIG.

This DVD-R drive has a CPU, RO
M, and a microcomputer including a RAM, etc., and includes an LPP detection unit 41, a WBL detection unit 42, a write timing generation unit 43, an encoder 44, a laser control unit 45, a write clock generation unit 46, a spindle control unit 47, and a write It comprises a clock phase correction unit 48 and the like.

[0008] The LPP detecting section 41 detects an LPP signal from a disk read signal from the pickup. WB
The L detection unit 42 detects a WBL signal from a disk read signal from the pickup.

[0009] The write timing generation unit 43
A data write timing signal is generated and output from the signal address information and the synchronization information. The encoder 44
The data is encoded into data to be actually written on a DVD-R disc. The laser control unit 45 controls a laser beam to be irradiated on the recording surface of the DVD-R based on the data from the encoder 44.

The write clock generator 46 multiplies the WBL signal and outputs it as a write clock. This write clock generation unit 46 is usually constituted by a PLL. The spindle control unit 47 uses the WBL signal to
CLV control is performed on the spindle motor that rotates.

In the DVD-R drive, a spindle control unit 47 controls the rotation of a spindle motor so that the WBL signal output from the WBL detection unit 42 has a constant frequency.

A write clock generation section 46 multiplies the WBL signal output at a constant frequency, and further generates a write clock phase-corrected by a write clock phase correction section 48 so as to accurately synchronize with the LPP. The data is output to the write timing generator 43, the encoder 44, and the laser controller 45.

Further, the write timing generator 43
Detects timing information for detecting address information and synchronization information of a disc recorded by the LPP and recording a frame synchronization pattern included in data to be written at a synchronization pit position recorded by the LPP.
Output to 4.

At this time, the timing signal is generated by considering in advance the time when the recording mark is actually generated on the disk by the laser control unit 45 after the data is output from the encoder 44.

Then, the encoder 44 outputs data according to the timing signal, and the laser controller 5 controls the recording surface of the DVD-R to irradiate a laser beam on the recording surface according to the data output from the encoder 44. Record the mark on.

As described above, the conventional DVD-R drive controls the writing of data in the manner described above, whereby the frame synchronization pattern included in the data to be written on the DVD-R shown in FIG. Can be recorded so as to overlap the synchronous pit position recorded by LPP.

By the way, when data is recorded on a rewritable optical disk having the same format as that of a DVD-R as in the above-mentioned conventional DVD-R drive, the same pattern is written when the data is rewritten. It will be recorded in the same place. In this way, L
PP, that is, a long mark (14) included in the synchronization pattern added to the write data at the location where the synchronization pit exists.
T) is recorded.

For this reason, the same mark is always recorded at the same position at the position where the frame synchronization pattern is recorded on the disk, and the disk recording layer at that portion is compared with the disk recording layer at other positions. Since the same stress is applied more, fatigue becomes severe.

Since the limit value of the number of times that data can be rewritten on the entire disk is determined by the degree of fatigue at the position where the frame synchronization pattern is recorded, it is necessary to frequently use only a certain portion as described above. As a result, there has been a problem that the number of rewritable times of the entire disk is reduced.

To solve this problem, Japanese Patent Application Laid-Open No. 9-18019
In the optical disk recording method described in Japanese Patent Publication No. 0, the recording start position of the recording data is changed randomly within a range that can be accommodated in the sector, thereby averaging the recording frequency of the disk recording layer to reduce recording fatigue at the same location, As a result, the number of rewritable times of the entire disk has been improved.

[0021]

However, in the above-described optical disk recording method, as shown in FIG. 2 or FIG. 6 in Japanese Patent Application Laid-Open No. 9-180190, the valid period of the Therefore, if the data write start position for each sector is randomly changed, a portion overlapping the next sector or the previous sector will be formed, and the recording frequency will increase in that portion, resulting in There has been a problem that the number of rewritable times of the entire disk is reduced.

The present invention has been made in view of the above points, and records recording data to which synchronization information has been added to an optical disk on which synchronization information has been recorded in advance, and records the position of the synchronization information recorded in advance. When aligning the position of the synchronization information to be written according to the data, by shifting the data within the range where sufficient resynchronization can be achieved, the recording frequency of the disk recording layer is averaged, and the recording fatigue at the same location is reduced. An object of the present invention is to improve the rewritable number of the entire disk.

[0023]

According to the present invention, in order to achieve the above object, when recording data including synchronization information is recorded on an optical disk in which the synchronization information is recorded in advance, the recording data to be recorded within a predetermined period is recorded. A write clock is generated by a predetermined number n (n is a positive number) greater than the required number of write clocks, and the recording start point for the optical disk is randomly set between the predetermined number of clocks (0 clock to n clocks). An optical disk recording device provided with a means for recording the recording data by changing the recording data.

Further, when recording data including synchronization information is recorded on an optical disk having a wobbled groove and pre-recorded synchronization information, the cycle of the wobble is detected and multiplied, and data of one sector is written. Write clocks are generated by a predetermined number n (n is a positive number) greater than the number of write clocks required for recording, and the recording start point for the optical disk is set to the predetermined number of clocks (0 clock to n).
It is preferable that the optical disk recording apparatus includes means for recording the recording data by changing the recording data at random between clocks.

Further, the predetermined number n (n is a positive number)
May be set to be equal to or less than the number of write clocks required when recording a mark that needs to be recorded in accordance with the recording position of the synchronization information recorded in advance on the optical disc.

Further, it is preferable that a random amount when changing the recording start point between the predetermined number of clocks (0 clock to n clocks) is generated by a control unit which controls the entire optical disk recording apparatus.

Further, the random amount when changing the recording start point between the predetermined number of clocks (0 clock to n clocks) is determined by the predetermined number using a clock that is asynchronous with the write clock and has a different cycle. It may be generated based on the output value of a binary counter (n-ary counter).

The optical disk may be a phase-change optical disk. Further, the optical disk may be a magneto-optical disk.

[0029]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disk recording apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing an internal configuration of the write clock generator 6 shown in FIG. FIG.
FIG. 3 is a block diagram showing an internal configuration of the timing delay circuit unit 10 shown in FIG.

This optical disk recording apparatus has a CPU, RO
M, and a microcomputer including a RAM, etc., and as shown in FIG.
L detection unit 2, write timing generation unit 3, encoder 4, laser control unit 5, write clock generation unit 6, spindle control unit 7, write clock phase correction unit 8, delay amount setting unit 9, timing delay circuit unit 10, etc. Consists of

The LPP detector 1 detects an LPP signal from a disk read signal from the pickup. WBL
The detection unit 2 detects a WBL signal from a disk read signal from the pickup.

The write timing generator 3 generates and outputs a data write timing signal from the address information and the synchronization information of the LPP signal. The encoder 4 encodes the data into data to be actually written on the optical disk.

The laser controller 5 controls a laser beam to irradiate the recording surface of the optical disk based on the data from the encoder 4. The write clock generation unit 6 generates a write clock that only changes the tens of write timings required to record data in one sector.

As shown in FIG. 2, the write clock generator 6 is inputted from a frequency divider 20 for dividing a wobble signal (WBL signal) by M (M is an integer), and frequency dividers 20 and 24. A phase comparator 21 that compares the phases of the two signals and outputs the phase difference as a voltage, and a low-pass filter (LP
F) 22, a VCO 23 for controlling the frequency of a signal output by a voltage input from the LPF 22, and a VCO 2
And a frequency divider 24 that divides the signal input from 3 by H.

With such a configuration, the write clock generator 6 multiplies the WBL signal by H / M and outputs it as a write clock. For example, when the frequency division ratio between the frequency dividers 20 and 24 is M = 16 and H = 2977, the WBL signal is multiplied by 2977/16 and output as a write clock.

Further, it is formed according to the pre-information to be recorded at a period interval of m times the unit period (m is an integer), and
An optical disk having pre-pits for recording with a deviation of k times the unit period (k is an integer and k <m) with respect to the period interval in accordance with the recording position (Japanese Unexamined Patent Application Publication No.
251710) and the period of the WBL signal is 1/8 of the period of the frame, the number of write clocks is 2977/16 during one WBL period, and two write clocks during one frame.
977/16 × 8 = 2977/2, 29 in one sector
77/2 × 26 = 38701 write clocks are generated. This is usually 38633 + 13 clocks required to record one sector of data.

The spindle control section 7 performs CLV control of a spindle motor for rotating an optical disk using the WBL signal. As shown in FIG. 4, the write timing generation unit 3 causes the periodic pit (1st bit LPP), which is a synchronization pattern on the land, to be located at the end of the synchronization pattern (14T mark) recorded on the groove. To output a write start signal.

This is because the configuration of the write timing generator for outputting the write start signal so that the synchronous pit on the land is located at the center of the synchronous pattern recorded on the groove is changed so that the timing signal is output several clocks earlier. It can be realized by changing to

Also, from the write timing generator 3,
As shown in FIG. 5, a write start signal is output so that a periodic pit (1st bit LPP), which is a synchronous pattern on a land, is positioned at the beginning of a synchronous pattern (14T mark) recorded on a groove. You may do so.

This is because the configuration of the write timing generation unit that outputs the write start signal so that the synchronous pit on the land is located at the center of the synchronous pattern recorded on the groove is changed to output the timing signal several clocks later. It can be realized by changing to

The timing delay circuit section 10 delays the timing signal output from the write timing generation section 3 by the delay amount set by the delay amount setting section 9 and outputs the delayed signal.

As shown in FIG. 3, the timing delay circuit section 10 outputs n flip-flop circuits (DEF) 30 corresponding to an n-ary counter and outputs a predetermined delay amount to a selector (SEL) 31. And a write timing signal and one of a plurality of signals input from each DEF 30 are stored in the register 32.
And a selector 31 for selecting and outputting according to a signal input from the selector 31.

The timing delay circuit 10
Are the write start signals input from the write timing generation unit 3 by n DEFs 30 to 1 to n, respectively.
The clock is delayed and output to the SEL 31, the SEL 31 inputs the delay amount stored in the register 32, and selects one signal from the write start signal and a plurality of signals input from each DEF 30 based on the delay amount. Output.

Here, if the number of write clocks required to record data of a sector is m and the number of clocks generated by the write clock generator 6 is M, the overlapping portion between the next sectors should be prevented. To do so, the above n is
m-1 or less. Here, n = 12.

The delay amount setting section 9 outputs a delay amount for delaying the write start signal by the timing delay circuit section 10. In the case of this embodiment, the amount of delay is randomly determined between 0 and 12 clocks each time data is written to the optical disk, and is written to the register 32 in the timing delay circuit unit 10. The random value may be set by software by a control unit that controls the entire optical disc recording apparatus, that is, a CPU or the like.

That is, the recording start point of the synchronization pattern is set to 0.
A random amount when changing between the clock and n clocks (a predetermined number of clocks) may be generated by a CPU (control unit) that controls the entire optical disc recording apparatus.

Further, an output value of a counter constituted by using a clock (for example, CPU clock or the like) having a different frequency without synchronizing with the write clock may be used.

As described above, by writing data to the optical disk, as shown in FIG. 6, data can be recorded by changing the data recording start position every time data is rewritten on the optical disk. And
It is possible not to deviate from the DVD-R and DVD-RW standards.

Further, according to this optical disk recording apparatus, a phase change type optical disk using a phase change material for a recording surface,
The above-described processing can be applied to any optical disk as long as the disk material on the recording surface becomes fatigued by rewriting data on a magneto-optical disk or the like using a magneto-optical recording material on the recording surface.

That is, when recording data including a synchronization pattern (synchronization information) on an optical disk on which a synchronization pattern (synchronization information) is recorded in advance, the write clock generation unit 6 uses A write clock is generated by a predetermined number n (n is a positive number) greater than the number of write clocks required for the recording data to be recorded on the optical disk. (Predetermined number n
), And the recording data is recorded by the laser control unit 5 on the basis thereof.

When recording data including synchronization information is recorded on an optical disk having a wobbled groove and pre-recorded synchronization information, the WBL detection unit 2 and the write clock generation unit 6 detect the wobble period. Then, the write clock is generated by a predetermined number n (n is a positive number) greater than the number of write clocks required for recording data of one sector, and the timing delay circuit 10 records the data on the optical disk. The start point is randomly changed between 0 clock and n clocks (predetermined number of clocks), and the recording data is recorded by the laser control unit 5 based on that.

Further, the timing delay circuit 10 sets a predetermined number n (n) equal to or less than the number of write clocks required when recording a mark that needs to be recorded in accordance with the recording position of the synchronization information recorded in advance on the optical disk. Is a positive number).

Further, the timing delay circuit section 10
Calculates a random amount when changing the recording start point of the synchronous pattern between 0 clock and n clocks (predetermined number of clocks) by using an n-ary counter (predetermined number Octal counter).

In this optical disk recording apparatus, even if the data write start position for each sector is randomly changed, there is no portion overlapping the next sector or the previous sector, and the recording frequency of the disk recording layer is averaged. By doing so, the recording fatigue at the same location can be reduced, and as a result, the number of rewritable times of the entire disc can be improved.

Further, by using a wobble signal having a shorter cycle as a reference when generating the write clock, the accuracy (jitter or the like) of the write clock can be increased, and the data can be more accurately transferred to the target recording position. Can be recorded.

Further, by minimizing the write start position that is changed randomly, the recording space of the optical disk can be used effectively.

Further, by changing the recording start position at random from 0 clock to n clocks by the CPU, the number of hardware components of the apparatus can be reduced, and the cost and size can be reduced.

The recording start position is set to 0 in hardware.
By randomly changing between the clock and n clocks, the load on the CPU can be reduced and the processing speed can be increased.

[0059]

As described above, according to the optical disk recording apparatus of the present invention, the recording data to which the synchronization information is added is recorded on the optical disk on which the synchronization information is recorded in advance, and the recording data is recorded in advance. When aligning the position of the synchronization information to be written in accordance with the position of the synchronization information, by shifting the data within a range that allows sufficient resynchronization,
By averaging the recording frequency of the disk recording layer, the recording fatigue at the same location can be reduced, and as a result, the number of rewritable times of the entire disk can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a write clock generation unit 6 shown in FIG.

FIG. 3 is a block diagram showing an internal configuration of a timing delay circuit unit 10 shown in FIG.

FIG. 4 is a diagram showing an example of a synchronization information recording format by the optical disc recording device shown in FIG. 1;

FIG. 5 is a diagram showing another example of a synchronization information recording format by the optical disc recording device shown in FIG. 1;

FIG. 6 is a diagram illustrating an example of a synchronization information recording format when a data recording start position is randomly changed each time data is rewritten by the optical disc recording device illustrated in FIG. 1;

FIG. 7 is a diagram showing an example of a conventional synchronization information recording format.

FIG. 8 is a block diagram showing a configuration related to data writing of a conventional general DVD-R drive.

[Explanation of symbols]

 1, 41: LPP detection unit 2, 42: WBL detection unit 3, 43: write timing generation unit 4, 44: encoder 5, 45: laser control unit 6, 46: write clock generation unit 7, 47: spindle control unit 8 , 48: write clock phase correction unit 9: delay amount setting unit 10: timing delay circuit unit 20, 24: frequency divider 21: phase comparator 22: low-pass filter 23: VCO 30: flip-flop circuit 31: selector 32: register

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D075 AA03 CC01 CC22 CC24 CC31 CD10 DD01 DD06 5D090 AA01 BB05 CC01 DD03 DD05 FF07 GG09 GG23 GG26 HH01 KK05

Claims (7)

[Claims] 1. When recording recording data including synchronization information on an optical disk on which synchronization information is recorded in advance, a predetermined number of write clocks are generated more than the number of write clocks required for recording data to be recorded within a predetermined period. An optical disk recording apparatus, further comprising means for recording the recording data by randomly changing a recording start point on the optical disk between the predetermined number of clocks. 2. When recording data including synchronization information on an optical disk having a groove wobbled and preliminarily recording synchronization information, the wobble period is detected and multiplied to record data of one sector. Means for generating a predetermined number of write clocks greater than the number of write clocks required when recording, and recording the recording data by randomly changing the recording start point for the optical disc between the predetermined number of clocks. An optical disk recording device characterized by the above-mentioned. 3. The method according to claim 1, wherein the predetermined number is set to be equal to or less than the number of write clocks required when recording a mark that needs to be recorded in accordance with a recording position of synchronization information recorded in advance on the optical disc. 3. The method according to claim 2, wherein
An optical disc recording apparatus according to claim 1. 4. The optical disk according to claim 1, wherein a random amount when changing said recording start point between said predetermined number of clocks is generated by a control unit which controls the entire optical disk recording apparatus. Recording device. 5. A random amount when changing the recording start point between the predetermined number of clocks, based on an output value of the predetermined decimal counter using a clock of a different cycle asynchronous with the write clock. An optical disk recording device characterized in that the optical disk recording device is generated. 6. The optical disk recording device according to claim 1, wherein said optical disk is a phase change optical disk. 7. The optical disk recording apparatus according to claim 1, wherein said optical disk is a magneto-optical disk.