JP2003022540A - Optical disk, and method and device for information recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record information in an accurate position in an optical disk containing address information recorded by wobbling. SOLUTION: A plurality of synchronous marks S in each sector at a constant cycle are formed in a pregroove 2 in advance. The number thereof is for example 200 per track (one round). This synchronous mark S has a type different (identified) from a pit formed corresponding to the recording of data in the pregrooove 2. Among the plurality of synchronous marks, reference marks R are formed at a rate of one per round of a track. The invention is applied to an optical disk, an optical disk recorder, and an optical disk recording/ reproducing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, an information recording device, and an information recording method, and in particular,
In particular, the present invention relates to an optical disc, an information recording device, and an information recording method, in which data can be recorded at an accurate position on an optical disc on which address information is recorded by wobbling a pre-groove.

[0002]

2. Description of the Related Art In order to record data on a disc, it is necessary to record address information so that the data can be recorded at a predetermined position. This address information may be recorded by wobbling.

That is, as shown in FIG. 14, a track for recording data is previously formed as a pre-groove, and the side wall of this pre-groove is wobbled (meandered) corresponding to the address information. This way,
You can read the address from the wobbling information,
Data can be recorded at a desired position.

[0004]

However, when the address is recorded by the wobbling as described above, the address can be accurately read in the state where the data is not recorded in the pre-groove (track). Yes, data can be recorded at an accurate position, but by forming a region (pit) in the track (pre-groove) and a region where the reflectance changes (pit), When data is recorded (such a recording method is performed, for example, on a disc on which data can be re-recorded), a change in reflectance caused by wobbling and a reflection caused by recorded data (pits) There is a problem in that it is difficult to correctly reproduce the address (wobbling information) by interfering with the change in the rate. As a result, there has been a problem that it is difficult to record the data at an accurate position.

Therefore, for example, it is conceivable to include address information in the data recorded on the track and specify the recording position based on the address information.

However, for example, when recording computer data or the like, the data is not continuously recorded in order from the beginning to the end of the track (pre-groove), but as shown in FIG. Is recorded intermittently.

That is, the track is divided into a plurality of clusters (or sectors), data is recorded in cluster units, and the clusters in which the data are recorded are not necessarily continuous.

As described above, when the data is recorded intermittently, the addresses are also recorded intermittently for each cluster, but a slight deviation occurs at the recording position of the cluster at each recording. Therefore, when the next recording is performed based on the recorded address, the error of the recording position is sequentially accumulated, and as shown in FIG. 16, interference occurs between adjacent clusters (sectors) before and after. There is a risk of
That is, the recording area at the end of the previous cluster will overlap the beginning of the next cluster.

To prevent this, for example, as shown in FIG. 16, it is possible to form a buffer area in which substantially no data is recorded in the area between the front and rear clusters.
However, in such a case, the actual recording capacity of the disc becomes small.

Therefore, as shown in FIG. 15, in a disc in which data is recorded randomly (intermittently), an address is recorded by wobbling, and the data is accurately recorded at a predetermined position based on the address. Had a challenge that was difficult.

The present invention has been made in view of the above circumstances, and is intended to enable data to be recorded at an accurate position on a disc for recording addresses by wobbling.

[0012]

The optical disc of the present invention comprises:
The track is divided into a plurality of sectors, and a first mark is formed in advance on the track at a first period, and a second mark has a second period shorter than the first period of the first mark. And at least one is formed in advance in each sector.

At least one of the first mark and the second mark can be formed by wobbling the groove at a frequency higher than the wobbling frequency of the groove.

At least one of the first mark and the second mark can be formed by pits.

At least one of the first mark and the second mark may be formed at the head of the sector.

The optical disc may be a constant linear velocity disc, the first mark may be formed at the beginning of the first sector of the track, and the second mark may be formed. The length of an integral multiple of the second period may be formed so as to form one sector.

The information recording apparatus of the present invention detects by the detecting means for detecting the first mark and the second mark pre-recorded on the optical disc, the recording means for recording information on the optical disc, and the detecting means. A recording position control means for controlling the recording start position of the information recorded by the recording means in accordance with the first mark and the second mark thus formed, and the optical disc has the track for recording the information wobbled. Preformed as a groove, the track is divided into a plurality of sectors, and the track is preformed with a first mark in a first cycle and a second mark is a first mark of the first mark. The second cycle is shorter than the cycle of, and at least one is formed in advance in each sector.

An information reproducing means for reproducing the information recorded by the recording means can be further provided.

The information processing method of the present invention comprises a detection step of detecting the first mark and the second mark pre-recorded on the optical disc, a recording control step of controlling recording of information on the optical disc, and a detection step. A recording position control step of controlling a recording start position of information whose recording is controlled by the processing of the recording control step according to the first mark and the second mark detected by the processing; A track to be recorded is formed in advance as a wobbled groove, and the track is divided into a plurality of sectors.
Mark is pre-formed in the first cycle,
The second mark has a second mark shorter than the first period of the first mark.
And at least one is formed in advance in each sector.

In the optical disc of the present invention, the track is divided into a plurality of sectors, the first mark is formed in advance on the track in the first cycle, and the second mark is the first mark of the first mark. And a second period shorter than the period, and at least one is formed in advance in each sector.

In the information processing apparatus and the information processing method of the present invention, the first mark and the second mark recorded in advance on the optical disc are detected, information is recorded on the optical disc, and the detected first mark is detected. Mark and second
The recording start position of the information to be recorded is controlled according to the mark of, and the optical disc is preformed as a wobbled groove on the track for recording the information,
The track is divided into a plurality of sectors, and a first mark is formed in advance on the track at a first period, and a second mark has a second period shorter than the first period of the first mark. And at least one is preformed in each sector.

[0022]

1 shows an example of the structure of a data recording disk of the present invention. As shown in the figure, a pre-groove 2 is spirally formed in advance on a disc (optical disc) 1 from the inner circumference to the outer circumference. Of course, this pre-groove 2 can also be formed concentrically.

The pre-groove 2 has its left and right side walls, as shown in a partially enlarged view in FIG.
It is wobbled in accordance with the address information and meanders at a predetermined cycle (for example, 45.4 μs).

Further, as shown in FIG. 2, the pre-groove 2 is preliminarily formed with a plurality of synchronization marks S in each sector at a constant cycle. The number is 1 track (1 lap)
For example, the number can be 200. This synchronization mark S has a form (identifiable) different from the pits formed in the pre-groove 2 corresponding to the recording of data.

Further, among the plurality of synchronization marks, one reference mark R is formed per track of the track.

FIG. 3 shows a concrete example of the structure of the synchronization mark and the reference mark. In FIG. 7A, the synchronization mark is formed by wobbling the pre-groove at a frequency higher than the wobbling frequency according to the address information. The reference mark corresponding to this is shown in FIG.
As shown in (D), it is formed by wobbling the pre-groove 2 at a frequency higher than the sync mark.

In the embodiment of FIG. 3B, the pregroove 2
The synchronization mark S is formed by connecting and disconnecting.
In this case, as shown in FIG. 3 (E), the reference mark R is formed by setting the intermittent interval to be different from the sync mark S.

Further, FIG. 3C shows an embodiment in which the synchronization mark S is formed as a pit. In this case, the reference mark is formed with a pit having a size different from that of the synchronization mark S, as shown in FIG.
Has been formed.

When the disc 1 is a CAV disc having a constant rotational angular velocity, the synchronization mark S and the reference mark R are arranged as shown in FIG. That is, the synchronization mark S and the reference mark R of each track are arranged on the same radius line. The synchronization marks S are arranged on a plurality of radius lines,
Since only one reference mark R is formed per turn, the reference mark R is arranged on one radial line.

When the disk 1 is a CAV disk, as shown in FIG. 2, the period (interval) of the synchronization marks S
Can be set independently of the sector length. In this case, as shown in FIG. 2, a boundary between sectors occurs between one sync mark and the next sync mark.

On the other hand, when the disk 1 is a CLV disk having a constant linear velocity, as shown in FIG. 5, one sector is completed with m synchronization marks S. That is, the length of each sector is set to be an integral multiple of the cycle (interval) of the synchronization mark S. Then, the synchronization mark S or the reference mark R is always arranged at the head of each sector. Then, the reference mark R is arranged at the head of the first sector of each track (one round of the pre-groove 2).

As a result, when the disc 1 is rotated counterclockwise, as shown in FIG.
The first mark located to the right of one radius r is the reference mark R. The other marks are synchronization marks S.

By doing so, the reference marks R are not aligned on the same radial line as in the CAV disc shown in FIG. 4, but by counting the number of sectors by using the reference marks R as a reference, It is possible to specify the sector on each track.

FIG. 7 shows a structural example of a circuit for generating a wobbling signal for wobbling the pre-groove 2. The generation circuit 11 generates a signal having a frequency of 44.1 kHz. The frequency of 44.1 kHz is the same frequency as the sampling clock of audio data of Mini Disc (trademark).

The signal generated by the generation circuit 11 is supplied to the division circuit 12 and, after being divided by the value 7, has a frequency of 6300.
It is supplied to the biphase modulation circuit 13 as a biphase clock signal of Hz. Bi-phase modulation circuit 1
3 also includes ADIP (ADdress In Pre)
-Groove) Data is provided.

The ADIP data is sector data, and the format of each sector is defined as shown in FIG. That is, the first 4 bits are the synchronization signal, the next 8 bits are the upper 8 bits that represent the cluster number, and the next 8 bits are the lower 8 bits that represent the cluster number. The next 8 bits represent the sector number, and the remaining 14 bits are the CRC signal for error detection and correction.

The bi-phase modulation circuit 13 includes a divider 12
The bi-phase clock supplied from the circuit is bi-phase modulated with ADIP data supplied from a circuit (not shown),
The biphase signal is output to the FM modulation circuit 15.
The FM modulation circuit 15 also generates a signal generated by the generation circuit 11.
A carrier having a frequency of 22.05 kHz obtained by dividing the 4.1 kHz signal by a value of 2 by the divider 14 is input. The FM modulation circuit 15 frequency-modulates the carrier input from the divider 14 with the bi-phase signal input from the bi-phase modulation circuit 13, and outputs the resulting FM signal. The left and right sidewalls of the pre-groove 2 of the disc 1 are formed (wobbled) in correspondence with this FM signal.

9 and 10 show a biphase modulation circuit 1
3 shows an example of a bi-phase signal output from the device 3. In this embodiment, when the preceding bit is 0, the synchronization pattern is "11101" as shown in FIG.
000 "is used and the preceding bit is a 1,
As the synchronization pattern, as shown in FIG.
10111 ″ is used.

FIG. 11 shows an example of the structure of a recording apparatus for manufacturing the disc 1 having pregrooves. The wobbling signal generation circuit 51 has the configuration shown in FIG. 7 described above and outputs the FM signal to the synthesis circuit 52. The mark signal generation circuit 53 generates a mark signal at the timing of forming the synchronization mark and the reference mark and outputs it to the synthesis circuit 52. The synthesizing circuit 52 synthesizes the FM signal output from the wobbling signal generating circuit 51 and the mark signal output from the mark signal generating circuit 53, and outputs the synthesized signal to the recording circuit 54. The recording circuit 54 responds to the signal supplied from the synthesizing circuit 52 by the optical head 55.
The master disc 56 is controlled to generate a laser beam for forming the pre-groove, the synchronization mark, and the reference mark. The spindle motor 57 is configured to rotate the master 56 at a predetermined speed.

That is, the wobbling signal generation circuit 51
The FM signal generated by is combined with the mark signal output from the mark signal generating circuit 53 in the combining circuit 52,
It is input to the recording circuit 54. The recording circuit 54 controls the optical head 55 in response to the signal input from the synthesizing circuit 52 to generate laser light. The laser light generated from the optical head 55 is applied to the master disk 56 rotated by the spindle motor 57 at a predetermined speed.

The master 56 is developed, a stamper is created from the master 56, and a large number of replica disks 1 are formed from the stamper. As a result, the disc 1 in which the pre-groove 2 having the synchronization mark S and the reference mark R described above is formed can be obtained.

FIG. 12 shows an example of the structure of a data recording / reproducing apparatus for recording / reproducing data on / from the disc 1 thus obtained. Spindle motor 31
Is configured to rotate the disk 1 at a predetermined speed. The optical head 32 irradiates the disc 1 with laser light to record data on the disc 1 and reproduces data from the reflected light. The recording / reproducing circuit 33 causes the memory 34 to temporarily record the recording data input from the device (not shown), and when data of one sector (or one cluster) as a recording unit is stored in the memory 34, The data for the sector is read out, modulated by a predetermined method, etc.
It is designed to output to. In addition, the recording / reproducing circuit 3
Reference numeral 3 appropriately demodulates the data input from the optical head 32 and outputs the demodulated data to a device (not shown).

The address generating / reading circuit 35 comprises a control circuit 3
Addresses to be recorded in the track (pregroove 2) are generated corresponding to the control from 8 and are output to the recording / reproducing circuit 33. The recording / reproducing circuit 33 adds this address to recording data supplied from a device (not shown) and outputs it to the optical head 32. Also, the optical head 32 is the disk 1
When address data is included in the reproduction data reproduced from this track, it is separated and output to the address generation / read circuit 35. The address generation / read circuit 35 outputs the read address to the control circuit 38.

Further, the mark detection circuit 36 includes the optical head 3
2 detects components corresponding to the synchronization mark S and the reference mark R from the RF signal reproduced and output. The wobbling information reading circuit 37 reads the address information (wobbling information) included in the wobbling signal from the reproduction RF signal output from the optical head 32, and the read result is the control circuit 38.
Is output to.

The mark period detection circuit 40 determines the periodicity of the detection pulse output when the mark detection circuit 36 detects the synchronization mark S and the reference mark R. That is, since the synchronization mark S (reference mark R) is generated at a constant cycle, the detection pulse input from the mark detection circuit 36 is
It is determined whether or not the detection pulse is generated in this constant cycle, and if it is a detection pulse generated in a constant cycle, a pulse synchronized with the detection pulse is generated and the phase comparator of the PLL circuit 41 in the subsequent stage is generated. To 42. Further, the mark cycle detection circuit 40 generates a pseudo pulse at a predetermined timing so that the PLL circuit 41 in the subsequent stage is not locked to the wrong phase when the detection pulse is not input at a constant cycle.

The PLL circuit 41 includes a phase comparator 42,
Low pass filter 43, voltage controlled oscillator (VCO) 44
And a frequency divider 45. The phase comparator 42 compares the phases of the input from the mark period detection circuit 40 and the input from the frequency divider 45, and outputs the phase error. The low-pass filter 43 compensates the phase of the phase error signal output from the phase comparator 42 and outputs it to the VCO 44. VCO4
The frequency divider 4 generates a clock having a phase corresponding to the output of the low-pass filter 43 and outputs it to the frequency divider 45.
Divides the clock input from the VCO 44 by a predetermined value and outputs the divided result to the phase comparator 42.

The clock output from the VCO 44 is supplied to each circuit and also to the sector counter 46. The sector counter 46 counts the number of clocks output by the VCO 44 with a reference mark detection signal generated when the mark detection circuit 36 detects the reference mark R as a reference, and the counted value is a preset predetermined value ( When it reaches the value (corresponding to the length of one sector), a sector start pulse is generated and output to the control circuit 38.

The sled motor 39 is controlled by the control circuit 38 to move the optical head 32 to a predetermined track position on the disk 1. In addition, the control circuit 38
Controls the spindle motor 31 to rotate the disk 1 at a predetermined speed.

Next, the operation of the data recording / reproducing apparatus shown in FIG. 12 during recording will be described with reference to the flowchart of FIG. First, in step S1,
Data recording on disk 1 is the first time (first time)
Is determined. Whether or not it is the first recording can be determined by reading a flag recorded at a predetermined position (for example, the innermost or outermost control track) of the disc 1. Therefore, for example, the control circuit 38 controls the sled motor 39 to cause the optical head 32 to access a predetermined position (control track) of the disk 1. Then, the data (flag in this case) recorded therein is read. The control circuit 38 causes the recording / reproducing circuit 33 to demodulate the output of the optical head 32 and captures the demodulation result. Then, it is determined whether or not the recording of the data on the disc 1 is the first time based on the fetched result.

When it is determined in step S1 that the data recording is the first time, the process proceeds to step S2, and the positional information of the optical head 32 is read from the wobbling information. That is, the optical head 32 irradiates the disk 1 with laser light and outputs an RF signal obtained from the reflected light. The wobbling information reading circuit 37 uses the RF signal.
The wobbling information (address information) is read from the signal, and the read result is output to the control circuit 38.

Then, in step S3, the control circuit 38
Causes the optical head 32 to access a desired recording position.
That is, the control circuit 38 controls the sled motor 39 so that the address information output by the wobbling information reading circuit 37 becomes the address information for recording data,
The optical head 32 is moved to a predetermined position. At this time, the control circuit 38 uses the reference mark detection signal output from the mark detection circuit 36 as a reference, and thereafter counts the sector start pulse output from the sector counter 46 to determine the position of the sector.

Next, in step S4, the control circuit 38
Monitors the output of the sector counter 46, waits until a sector start pulse is input, and when the sector start pulse is input, proceeds to step S5 to start the recording operation.

That is, the control circuit 38 is supplied from a device (not shown), and via the recording / reproducing circuit 33, the memory 34.
The data for one sector (for one cluster) stored in 1 is read by the recording / reproducing circuit 33 and supplied to the optical head 32. The optical head 32 irradiates the disc 1 with a laser beam corresponding to the input data. As a result, recording of data for one sector is started from the position of the synchronization mark S (or the reference mark R) on the disc 1. And
Data for the required sectors are sequentially recorded.

When this recording is completed, a flag indicating that the first recording has been performed is recorded at a predetermined position (control track) on the disc 1.

At this time, the control circuit 38 also causes the address generating / reading circuit 35 to generate an address corresponding to the recording position of the disk 1 and supply it to the recording / reproducing circuit 33. The recording / reproducing circuit 33 adds this address to the recording data and supplies it to the optical head 32. As a result, together with the record data, the address data indicating the record position is recorded as a kind of data.

As described above, if the data is recorded even once, it is determined in step S1 that the data has already been recorded. Therefore, the process proceeds from step S1 to step S6, and the control circuit 38 writes the track. A process of reading address data from the recorded data is executed.

That is, the control circuit 38 controls the optical head 32.
Then, the data recorded on the track of the disk 1 is reproduced, and the recording / reproducing circuit 33 is caused to demodulate the reproduced data output from the optical head 32. The address generating / reading circuit 35 reads address data from the data reproduced / demodulated by the recording / reproducing circuit 33, and outputs the read result to the control circuit 38. The control circuit 38 determines the current position of the optical head 32 based on the address data read from the recording data. Then, the process proceeds to step S3, and the subsequent processes are executed in the same manner as described above.

That is, the current position is read from the address data existing in the recording data, the optical head 32 is controlled so that the position becomes the desired recording position, and the optical head 32 outputs the sector start pulse at the desired position. Then, recording of data for one sector is started from that position.

As described above, since the data recording is performed with the sector start pulse as a reference, even if the recording operation is performed intermittently, the deviation of the recording position is prevented from accumulating.

On the other hand, during reproduction, the control circuit 38 controls the sled motor 39 to access the optical head 32 to a desired track position on the disk 1. Control circuit 3
At this time, 8 determines the current position of the optical head 32 from the output of the address generating and reading circuit 35. Then, when the current position reaches the desired address position, a sector start pulse is detected, and then the supplied reproduction data is taken into the memory 34 via the recording / reproducing circuit 33 as the data of the sector to be reproduced. Then, the data is read again and supplied from the recording / reproducing circuit 33 to a device (not shown).

When the reading of the data of the sector recorded in the memory 34 is instructed, the memory 34
The data of the sector recorded in the above is read and output to a device (not shown).

[0062]

According to the first aspect of the present invention, information can be recorded on this optical disk. Further, according to the first aspect of the present invention, by forming the first mark and the second mark in advance, it is possible to record information at an accurate position when recording information on this optical disc. it can.

According to the second aspect of the present invention, information can be recorded on the optical disc. Further, according to the second aspect of the present invention, by making it possible to detect the first mark and the second mark, it is possible to record information at an accurate position on the optical disc.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a data recording disc of the present invention.

FIG. 2 is a diagram illustrating a synchronization mark and a reference mark.

FIG. 3 is a diagram showing a more detailed configuration example of a synchronization mark and a reference mark.

FIG. 4 is a diagram illustrating positions of a synchronization mark and a reference mark on a CAV disc.

FIG. 5 is a diagram illustrating a synchronization mark and a reference mark of a CLV disc.

FIG. 6 is a diagram illustrating positions of a synchronization mark and a reference mark on a CLV disc.

FIG. 7 is a block diagram showing a configuration example of a wobbling signal generation circuit.

FIG. 8 is a diagram showing a format of a sector.

FIG. 9 is a diagram illustrating a bi-phase signal.

FIG. 10 is a diagram illustrating another bi-phase signal.

FIG. 11 is a block diagram showing a configuration example of a disc manufacturing apparatus.

FIG. 12 is a block diagram showing a configuration example of a data recording / reproducing device.

FIG. 13 is a flowchart illustrating an operation at the time of recording in the embodiment of FIG.

FIG. 14 is a diagram illustrating address recording by wobbling.

FIG. 15 is a diagram illustrating intermittent recording.

FIG. 16 is a diagram for explaining variations in recording positions of clusters.

[Explanation of symbols]

1 disk, 2 pregrooves, 11 generation circuit, 13 bi-phase modulation circuit, 15 FM modulation circuit, 31 spindle motor, 32 optical head,
33 recording / reproducing circuit, 34 memory, 35 address generating and reading circuit, 36 mark detecting circuit, 37
Wobbling information reading circuit, 38 control circuit, 39
Sled motor, 40 mark cycle detection circuit, 4
6 sector counter

Continued front page    (72) Inventor Ritsu Takeda             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation (72) Inventor Hiroshi Ogawa             6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Soni             -Inside the corporation F-term (reference) 5D029 WA02                 5D090 AA01 CC14 GG03 GG21 GG26

Claims (8)

[Claims] 1. An optical disc in which a track for recording information is formed in advance as a wobbled groove, wherein the track is divided into a plurality of sectors, and the track has a first mark at a first cycle. It is pre-formed and the second mark is the first mark of the first mark.
An optical disc having a second period shorter than the period and at least one preformed in each sector. 2. The at least one of the first mark and the second mark is formed by wobbling a groove at a frequency higher than a wobbling frequency of the groove. The optical disc described in. 3. The optical disc according to claim 1, wherein at least one of the first mark and the second mark is formed by a pit. 4. The optical disc according to claim 1, wherein at least one of the first mark and the second mark is formed at the head of the sector. 5. The optical disk is a disk having a constant linear velocity, the first mark is formed at the head of the first sector of the track, and the second mark is of the second cycle. The optical disc according to claim 1, wherein a length of an integral multiple is formed so as to form one sector. 6. An information recording apparatus for recording information on an optical disc, the detecting unit detecting a first mark and a second mark pre-recorded on the optical disc, and recording the information on the optical disc. Recording means, and recording position control means for controlling a recording start position of the information recorded by the recording means in accordance with the first mark and the second mark detected by the detecting means, In the optical disc, a track for recording the information is formed in advance as a wobbling groove, the track is divided into a plurality of sectors, and the track has the first mark in a first cycle in advance. Being formed, the second mark has a second period shorter than the first period of the first mark, and Information recording apparatus characterized by being at least one pre-formed connector. 7. The information recording apparatus according to claim 6, further comprising an information reproducing means for reproducing the information recorded by the recording means. 8. An information processing method of an information recording apparatus for recording information on an optical disc, the detecting step of detecting a first mark and a second mark pre-recorded on the optical disc; A recording control step of controlling recording, and recording start of the information in which recording is controlled by the processing of the recording control step according to the first mark and the second mark detected by the processing of the detecting step. A recording position control step for controlling a position, the optical disc, the track for recording the information is formed in advance as a wobbled groove, the track is divided into a plurality of sectors, the track, The first mark is formed in advance in a first cycle, and the second mark is A short second period than the first period of the first mark, and the information recording method characterized in that it is at least one pre-formed in each of the sectors.