JPH10334469A - Recording and reproducing method of optical information recording medium and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording/reproducing method and device therefor capable of properly suppressing the deterioration of the recording film of an optical disk and more increasing a number of times of repeated recording by changing the changing width of the starting point of recording of a data area in accordance with a recording condition and a recording medium. SOLUTION: A recording condition in a rewriting sector on an optical disk 113 is identified by an identifier detecting circuit 119 and the range of the changing width of a recording start point is set according to the recording condition by a delaying amount control circuit 106. The recording timing of a modulating data signal 105 is changed within the set range of the changing width and the rewriting operation of information of the relevant sector on the optical disk 113 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an optical recording medium recording / reproducing method and apparatus for reproducing.

[0002]

2. Description of the Related Art In recent years, optical disks, optical cards, optical tapes and the like have been proposed and put into practical use as media for optically recording information. Among them, an optical disk has been particularly noted as a medium capable of high-capacity and high-density recording and reproduction.

[0003] A conventional recording / reproducing method for an optical disk will be described below with reference to the drawings. First, an example of a configuration of an optical disk using a phase change recording film as a recording film is shown in FIG.
FIG. A guide groove 230 is formed in a substrate 2301 made of glass or a resin material (for example, PMMA or polycarbonate).
2, and uneven pits indicating the address information and the like (the area where this pit row exists is called an ID area) are formed in advance. The guide groove is formed spirally or concentrically from the inner circumference to the outer circumference. A portion 2307 between the guide grooves is called a land. The ID areas are arranged at predetermined intervals in the guide groove. The area of each guide groove between the ID areas is called a sector. On the substrate 2301, a protective film 2303, a recording film 2304, and a reflective film 2305 are deposited by sputtering or the like, and a protective substrate 2306 is bonded.

The recording and reproduction of such an optical information recording medium will be described with reference to FIGS. FIG. 28 is a diagram showing a configuration example of a conventional recording / reproducing apparatus. FIG. 29 is a diagram for explaining the recording / reproducing operation of the optical disk.
(A) is a recording data signal, (b) is a laser driving signal,
(C) shows the recording state on the optical disk, and (d) shows the recording format.

[0005] Reproduction from an optical disk is performed as follows.
The system control circuit 101 drives the spindle motor 114 to rotate the optical disk 113. Optical head 11
2 focuses a weak laser beam (that is, the laser power Pr in FIG. 29B) and irradiates it onto the optical disc 113.
9 (c) on the guide groove 2302 and a series of pits 250
2 tracking. The amount of light reflected from the optical disk 113 changes depending on the presence or absence of the pits 2502 and the presence or absence of the recording marks 2501. By detecting the amount of reflected light, a reproduction signal 122 is obtained. Then, the reproduced signal processing circuit 115 performs signal processing such as binarization and the like, and the demodulation circuit 116 demodulates. Then, error correction is performed using the error correction information, and deinterleaving processing is performed to obtain desired reproduction information. The deinterleave processing is for restoring the recorded information rearranged by the interleave processing.

Next, recording on an optical disk is performed as follows. System control circuit 10 connected to host computer
When recording information 102 which is binary information from 1 is given, error correction information (also called parity) is added to this recording information, and an interleave process is performed. The interleaving process is for converting a burst error (that is, a continuous long error) due to a defect or the like of the optical disc 113 into a random error (that is, a short error) to facilitate error correction. This is a process of dividing and rearranging according to rules. Then, the modulation circuit 1
04, for example, the (1, 7) RLL modulation method or (8-1
6) Modulate by the modulation method. As a result, a modulated data signal 105 corresponding to the recording pattern to be recorded in the data area 604 of FIG. 29D is obtained.

The synthesizing circuit 109 adds the VFO and RESYNC from the synchronizing signal generating circuit 108 and, if necessary, the dummy data from the dummy data generating circuit 107 for each data length to be recorded in each sector. 118. Both VFO and RESYNC are synchronization signals provided to generate a clock synchronized with the reproduction signal by a PLL (synchronous signal generator) in the reproduction signal processing circuit 115. VFO is arranged before the modulated data signal, and RESYNC is arranged at a fixed interval in the modulated data signal. Dummy data is a data recording area provided to reduce the influence of recording film deterioration occurring at the recording end point in a sector during repeated recording. The dummy data does not necessarily need to include recording information. The recording data signal 118 has a waveform as shown in FIG.

In response to the recording data signal 118, a laser drive signal 111 is generated by a laser drive circuit 110, and the laser in the optical head 112 is driven to modulate the intensity of the laser light. The laser drive signal 111 has a waveform as shown in FIG.

A strong laser beam focused by the optical head 112 shown in FIG. 28 (that is, the power Pp of the laser beam shown in FIG. 29B) is applied to the recording film of the optical disk 113 so that the temperature of the recording film exceeds the melting point. When it is raised, the molten portion is rapidly cooled and becomes a recording mark 2501 in an amorphous state (refer to FIG. 29C). When a laser beam (that is, the power Pb of the laser beam in FIG. 29B) is focused and irradiated to raise the temperature of the recording film to near the melting point, the recording film in the irradiated portion is heated to a temperature higher than the crystallization temperature. Then, it is gradually cooled to a crystalline state.

In this manner, a crystalline and amorphous recording pattern corresponding to the modulated data signal 105 is formed on the data area 604 of the guide groove 2302. Then, utilizing the difference in the reflectance between crystalline and amorphous, storage of information,
Playback is performed.

As shown in FIG. 29D, a gap region 6 is provided between the ID region 601 and the VFO region 603.
02, the dummy data area 605 and the next ID area 6
A buffer area 606 is provided between the data area 01 and the data area 01. The gap area 602 is an area for obtaining a time for controlling the laser power, and the buffer area 606 is an area for absorbing a deviation of a recording position due to uneven rotation of a spindle motor.

At the time of recording, a sector 607 of the optical disk is used.
When scanning the intervening ID area 601, the address information is reproduced by lowering the intensity of the laser beam to a weak power similar to that at the time of reproduction and irradiating the laser beam onto the optical disk.

The configuration of the system control circuit will be described with reference to FIG. The transfer of the recording information and the reproduction information between the host computer and the recording / reproducing apparatus is performed by the recording information buffer circuit 2
601 and a reproduction information buffer circuit 2602. The reproduction information is also input to the address information detection circuit 2603 together with the reproduction information buffer circuit 2602.
The address information detection circuit 2603 detects address information and issues an address information detection signal indicating the timing of address information detection. The address information detection signal is transmitted to the recording information buffer circuit 2601 and the reproduction information buffer circuit 2.
602. The motor drive circuit 2604 rotates the spindle motor.

By the way, when the recording on the optical disk is repeated as described above, the quality of the reproduced signal of the data recorded in the sector tends to locally deteriorate. In particular, when similar recording data is repeatedly recorded in the same sector, this tendency becomes remarkable. This is because, on the sector, there are portions where melting / solidification is repeated many times and portions where no melting occurs at all, and the thickness of the recording film fluctuates at the boundary between both portions, thereby deteriorating thermal and optical characteristics. . As a result, the quality of the data reproduction signal may be degraded or information may not be recorded.

In order to solve such a problem, there has been proposed a recording method for recording information by randomly shifting a data recording start point in a sector of an optical disk within a certain range (this is referred to as a change width). (See, for example, JP-A-2-94113).

[0016]

However, in the above-described conventional recording method, the change width of the recording start point is constant regardless of the recording medium and the recording conditions. On the other hand, the degree of deterioration of the recording film for the same number of repeated recordings and the reproducibility for the same degree of deterioration of the recording film differ depending on the recording conditions and the recording medium.

Therefore, in the conventional recording method, the number of repetitions may not be sufficiently improved. For example,
When rewriting a data area on an optical disc, rewriting is performed in sector units. Therefore, even if the information to be rewritten is a part of the sector, the entire sector is actually rewritten. In particular, since information corresponding to a table of contents of information recorded on the disc is recorded in the directory area on the disc, repetitive recording is performed frequently and very similar data is rewritten. Therefore, in this area, the recording film tends to deteriorate earlier than in an area in which actual information is recorded (this is called a general area).

If the change width of the recording start point is increased, the deterioration of the recording film is improved. However, since the data area must be accommodated in the sector, the area that can be used for VFO and dummy data in the sector decreases. Will be. That is,
When a VFO area for obtaining a synchronizing signal is added before the data area and a dummy data area is added after the data area to cope with the deterioration of the recording film at the end of the sector, a change in the data recording start point occurs. When the width is increased, VFO
The length of the part and the dummy data part must be shortened.
Therefore, the recording film becomes sensitive to the deterioration of the recording film at the start and end portions of the sector which occurs when the recording is repeatedly performed. That is, there is a high possibility that information cannot be reproduced with respect to the same deterioration of the recording film. As a result, the number of times of repetitive recording is reduced.

Further, in the case of an apparatus for recording and reproducing both a medium having a high recording density and a medium having a low recording density, if the position (or interval) or edge of a recording mark cannot be accurately detected on a medium having a high recording density, information is reproduced. Therefore, the information reproducing ability becomes sensitive to the deterioration of the recording film. That is, even with the same deterioration of the recording film, it is more difficult to accurately reproduce information on a medium having a higher recording density.

According to the present invention, in order to solve the above-mentioned conventional problems, the deterioration of the recording film of the optical disk can be appropriately controlled by changing the change width of the recording start point of the data area according to the recording conditions and the recording medium. It is an object of the present invention to provide a recording / reproducing method and apparatus capable of further increasing the number of times of repetitive recording possible.

[0021]

According to the method and apparatus for recording / reproducing an optical information recording medium of the present invention, information is recorded by randomly changing the recording start point of data in a sector of the optical information recording medium. The change width of the recording start point is changed to at least two types, and the recording start point of the modulated data signal and the recording start point of the VFO are independently changed within a predetermined change range. Accordingly, the necessary lengths of the VFO and the dummy data can be secured at the same time while appropriately securing the gap area and the buffer area.

According to the recording / reproducing method of the present invention, a modulation step of converting an information signal into a modulation data signal corresponding to a recording pattern on the optical information recording medium, and selecting a first recording timing or a second recording timing And when the first recording timing is selected in the selecting step, the recording start point of the modulated data signal is randomly changed within a predetermined range of change with respect to the sector position. When the second recording timing is selected in the process,
A recording control step of randomly changing a recording start point of the modulated data signal within a range of a change width larger than the predetermined change width with respect to a sector position, wherein a recording start point of the modulated data signal and a VFO The recording start point is independently changed with respect to the sector position.

According to the above configuration, in the case of a medium having a high repetitive recording frequency, the length of the VFO or dummy data is shortened to secure a large change width, and local deterioration of the recording film during repetitive recording is prevented. It is possible to improve the information reproducing ability by improving the information, and at the same time, it is possible to cope with the deterioration of the start and end of the sector and to increase the number of times of repeated recording. On the other hand, in a medium having a low repetitive recording frequency, the length of the VFO and the dummy data can be increased to deal with the deterioration of the start and end of the sector, and the number of repetitive recordings can be increased.

The recording conditions and information on the recording medium can be recorded on the medium as identifiers. In this case, the recording / reproducing method of the present invention includes an identification step of detecting an identifier recorded on the optical information recording medium, and the first recording timing or the second recording timing in the selection step based on the identification result of the identification step. It is preferable to select the recording timing.
Alternatively, an identifier recorded on a cartridge holding an information recording medium may be detected.

Further, the variation width may be changed according to the type of the modulated data signal. Further, the repetitive recording frequency of the sector to be recorded, whether or not the sector to be recorded is a directory area, whether the sector is on a groove (ie, a guide groove) or on a land (ie, between guide grooves), etc. The change width of the recording start point may be set according to the recording conditions. That is, the identification step identifies a plurality of optical information recording media having different repetition recording frequencies or a plurality of regions on the optical information recording medium having different repetition recording frequencies, or on the optical information recording medium. It is preferable to identify whether the sector to be recorded is a directory area or a non-directory area, or to identify whether the sector to be recorded is on a groove or a land.

According to another aspect of the present invention, there is provided a recording / reproducing method for an optical information recording medium, comprising the steps of: identifying a plurality of optical information recording media having different recording densities; A modulation step of converting to a modulated data signal corresponding to a pattern, a selection step of selecting a first recording timing or a second recording timing based on the identification result of the identification step, and a first recording timing in the selection step Is selected, at least the recording start point of the modulated data signal is randomly changed within a predetermined range of change with respect to the sector position, and when the second recording timing is selected in the selecting step, A recording control step of randomly changing at least a recording start point of the modulated data signal with respect to a sector position within a range of change larger than the predetermined change range. It is equipped with a door. Preferably, the recording start point of the modulation data signal and the recording start point of the VFO are independently changed within a predetermined change range.

In the identifying step, a plurality of optical information recording media having different linear densities and track pitches are identified, or a plurality of optical information recording media having different modulation methods are identified. It is preferable to detect an identifier recorded in a predetermined area of the optical information recording medium.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method and apparatus for recording / reproducing an optical information recording medium according to the present invention will be specifically described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a diagram showing a configuration of a recording / reproducing apparatus using a recording / reproducing method according to the present invention, and FIG. 2 rewrites recording information of a certain sector in Embodiment 1 of the present invention. It is a flowchart explaining an operation.
After detecting the address information of the sector to be rewritten on the optical disk 113 (step 201), the system control circuit 101 connected to the host computer outputs the record information 102 which is binary information (step 202).

The recording information is added with error correction information and interleaved (step 203), and modulated by the modulation circuit 104 (step 204). The above operation is the same as the configuration of the conventional example.

Next, the modulation data signal 105 output from the modulation circuit is input to the delay amount control circuit 106. In the delay amount control circuit 106, the change width of the recording start point is reduced in the general area (step 207) according to the identification result of whether the corresponding area is an area having a high repetitive recording frequency such as a directory area (step 205). In the directory area, the change width of the recording start point is set large (step 206). The above-described identification result is obtained by detecting the identifier by the identifier detection circuit 119. The identifier is recorded in advance in the ID area (601 in FIG. 29) of each sector. The identifier detection circuit 119 is provided on the optical disc 113
The system control circuit 10 corresponds to the recording position of the above identifier.
An identifier is detected in accordance with a predetermined timing issued by 1 and the identification result is transmitted as a signal.

The delay amount control circuit 106 randomly delays the modulated data signal 105 within a range of a delay amount corresponding to the set change width (step 208). Details of the configuration of the delay amount control circuit will be described later.

The synthesizing circuit 109 adds a synchronizing signal (VFO) from the synchronizing signal generating circuit 108 for each data length to be recorded in each sector, and adds dummy data from the dummy data generating circuit 107 if necessary. The recording data signal 118 is set (step 209). The recording data signal 118 is input to a laser drive circuit 110 to generate a laser drive signal 111 to drive the laser in the optical head 112. Then, the intensity of the laser beam is modulated (step 210), and the laser beam is irradiated onto the optical disk 113 and recorded in the corresponding sector (step 211).

Here, the configuration of the system control circuit will be described with reference to FIG. 3 differs from the conventional system control circuit in that the identification timing generation circuit 2701 supplies an identification timing signal to the identifier detection circuit 119 in accordance with the address information and the address information detection signal from the address information detection circuit 2603. The address information detection signal is also provided to the delay amount control circuit 106.

Next, the delay amount control circuit 106 will be described. FIG. 4 shows an example of the configuration of the delay amount control circuit 106. The delay amount control circuit includes a recording control unit having two different types of recording timing setting functions, and a selecting unit for selecting the recording timing setting function according to an identifier. FIG.
In the delay amount control circuit of FIG. The recording control unit includes a plurality of delay circuits 301 and 30
The circuit comprises two clock generation circuits 302 and 303 for generating a clock for operating the clock signal 1, and a selector 304 for determining an input destination of the modulated data signal 105 to the delay circuit 301.

The delay amount of the delay circuit 301 is 0, T, 2T, 3T,.
It is set to be 16T. That is, when the clock is T, the interval between the stages in which the delay amount changes is T, and the number of stages of the delay amount is 16. Each delay circuit includes a shift register, a delay line, a counter, and the like.

In the delay amount control circuit of FIG. 4, two clock generation circuits 302 and 303 are provided. By switching the selection circuit 305, the first clock generation circuit 302
Is selected, the delay circuit 301 randomly changes the recording timing within the range of change from 0 to 16T (this corresponds to the first recording timing setting function).

When the second clock generation circuit 303 is selected by the selection circuit 305, the delay circuit 301
The recording timing is changed randomly within the range of the change width of 160T (this corresponds to the second recording timing setting function).

The actual operation of the delay amount control circuit of FIG. 4 is as follows. When recording on the general area of the optical disk 113, the selection circuit 305 is switched to the first clock generation circuit 30 according to the signal 121 from the identifier detection circuit 119.
Switch to 2. First clock generation circuit 302
Outputs a clock T to generate a delay amount from 0 to 16T. Then, the destination of the selector 304 is randomly determined by the address detection signal 120 from the system control circuit. The destination of the selector is held until the next address is detected.

On the other hand, when recording in the directory area, the selection circuit 305 is switched to the second clock generation circuit 303 in accordance with the signal 121 from the identifier detection circuit 119. The second clock generation circuit 303 outputs the clock 10T and generates a delay amount from 0 to 160T. Then, the destination of the selector 304 is randomly determined by the address detection signal 120 from the system control circuit. In this way, by changing the interval between the delay stages in the directory area and the other area, the change width of the recording start point in the data area can be made different.

FIG. 5 is a diagram showing another example of the configuration of the delay amount control circuit. In the delay amount control circuit of FIG. 5, the selection unit includes a selection circuit 405. The recording control unit includes a plurality of delay circuits 40
1, a clock generation circuit 402 for generating a clock for operating the delay circuit 401, and two selectors 403 and 404 for determining an input destination of the modulated data signal 105 to the delay circuit 401.

The delay amount of the delay circuit 401 is set to be 0, T, 2T, 3T,..., 160T in accordance with the delay clock T. That is, the interval between the stages in which the amount of delay changes is T, and the width of change in the amount of delay is 160T.
It is.

The delay amount control circuit of FIG. 5 has two selectors 403 and 404. When the selection circuit 405 is switched to select the first selector 403, the delay circuit 40
1 randomly changes the recording timing within a range of 0 to 16T (this corresponds to a first recording timing setting function). Also, the second selection circuit 405
When the selector 404 is selected, the delay circuit 401
The recording timing is changed randomly within the range of the change width of 160T (this corresponds to the second recording timing setting function).

The actual operation of the delay amount control circuit of FIG. 5 is as follows. When recording in the general area of the optical disk 113, the selector 405 is switched so as to pass through the first selection circuit 403 according to the signal 121 from the identifier detection circuit 119, and any one of the 16-stage delay amounts of the delay circuits 1 to 16 is used. And a delay amount of 0 to 16T is generated. Then, the destination of the first selection circuit 403 is randomly determined by the address detection signal 120 from the system control circuit. The destination of the selector is held until the next address is detected.

On the other hand, when recording in the directory area, the selector 405 is switched so as to pass through the second selection circuit 404 according to the signal 121 from the identifier detection circuit 119, and the delay amounts of the delay circuits 0 to 160 in 160 steps are set. Either one is selected and a delay amount of 0 to 160T is generated. Then, the destination of the second selection circuit 404 is randomly determined based on the address detection signal 120 from the system control circuit. In this way, by changing the number of delay stages between the directory area and the other area, the change width of the recording start point of the data area can be changed.

Next, a comparative experiment (example) performed to confirm the effect of the present embodiment will be described. For the substrate of the optical disk 113, a polycarbonate resin having a thickness of 0.6 mm was used. This substrate is pre-formatted with uneven phase pits as address information in advance,
A recording guide groove was formed in the sector area. The pitch of the guide grooves is 1.6 μm. On the substrate, a protective film, a photosensitive recording film, a protective film, and a reflective film were formed in four layers by a sputtering method, and the protective substrate was bonded thereon.

ZnS—SiO ₂ was used as a protective film, Te—Sb—Ge was used as a photosensitive recording film, and Al was used as a reflective film. The disk was rotated at a linear velocity of 5 m / s by the spindle motor 113, and recording was performed by focusing a laser beam having a wavelength of 680 nm with an objective lens having a numerical aperture (NA) of 0.6.

The power of the laser beam at the time of recording / reproduction is Pp = 1
0 mW, Pb = 4 mW, and Pr = 1 mW. The modulation method of the recording information used was (8-16) pulse width modulation. The shortest mark length was 0.6 μm. As shown in FIG. 4, the delay amount control circuit 109 employs a configuration in which the clock generation circuits 302 and 303 set the intervals of each stage to determine the change width of the recording start point.

Using the above conditions, first, the relationship between the change width of the recording start position in each area and the error rate of the reproduction information was examined. In the directory area, two patterns of recording information are repeatedly recorded on the assumption that similar recording information is recorded, and the change width is 0 to 160T (interval of each step is 0).
-10T). In the general area, recording information of 30 patterns was repeatedly recorded, and the variation width was set in a range of 0 to 64T (interval of each step was 0 to 4T). Then, the error rate of the reproduced information after the recording was repeated 10,000 times was measured.

FIG. 6A plots the relationship between the change width of the recording start position in the general area and the error rate of the reproduction information after 100,000 times of repeated recording. FIG. 6B plots the relationship between the change width of the recording start position in the directory area and the error rate of the reproduced information after 100,000 times of repeated recording.

FIG. 6 shows that the greater the change width of the recording start position, the better the error rate can be obtained after 100,000 repetitions of recording. Then, it was found that the minimum change width at which a good error rate was obtained was different in each area (that is, the randomness of recorded information).

From the above results, the range of change of the recording start point was set as follows. As a variation width at which an error rate of 5 × 10 ^-4 or less is obtained, a variation width in a general area is 16T, an interval between each stage is 1T, a variation width in a directory area is 160T, and an interval between each stage is 10T. Is a variable change width method. Then, as a comparative example, the change width in both regions is 16T, the interval between each step is 1T, the change width fixed method 1 is used, the change width in both regions is 160T,
The interval between each step was set to 10T, and the fixed change width method 2 was used.

Next, for each of the above methods,
The recording format will be described below. FIG.
FIG. 7 is a diagram illustrating a recording format when a change width of a recording start point is set to 16T (that is, when a first recording timing is set). Here, the data recording clock is the same as the delay clock T, the data capacity that can be recorded in one sector is 1000 bytes, and the length of the VFO area and dummy data when the recording start point is not changed is 15 bytes. did.

FIG. 7A shows a recording format when the recording start point is not changed. The data area (ie, the area corresponding to the modulated data signal) 604 corresponds to FIG.
After adding a delay by the delay amount control circuit 109 of FIG.
603 and dummy data 605 are added, and a signal (that is, a recording data signal) corresponding to these areas is input to the laser driving circuit 110 and the laser driving signal 111 is input.
Occurs.

FIG. 7B shows a recording format when the recording start point is shifted backward by 16T (that is, 1 byte). In this case, the laser drive signal (111 in FIG. 1) corresponding to the data area is generated at a time 16T later than in the case of FIG. 7A. When recording is performed with a change width of 16T, the timing at which the laser drive signal of the portion corresponding to the data area is generated by the delay amount control circuit changes within the range of 16T, and as a result, the recording position of the data area in the sector is 16T. (That is, 1 byte).

FIG. 8 is a diagram showing a recording format when the change width of the recording start point is set to 160T (that is, when the second recording timing is set). FIG. 8A shows a recording format when the recording start point is not changed. FIG. 8B shows that the recording start point is 80T.
(Ie, 5 bytes) is the format of the recording when shifting forward. In the case of FIG. 8B, the laser drive signal (111 in FIG. 1) corresponding to the data area is:
It occurs at a time earlier by 80T than in the case of FIG. FIG. 8C shows a recording format when the recording start point is shifted backward by 80T (that is, 5 bytes). In the case of FIG. 8C, the laser drive signal (111 in FIG. 1) corresponding to the data area is generated at a time later by 80T than in the case of FIG. 8A.

When recording is performed with a change width of 160T, the timing at which the laser drive signal is generated by the delay amount control circuit changes within the range of 160T, and as a result, the recording position in the sector is within the range of 160T (ie, 10 bytes). To change. The length of the sector is determined in advance by the ID area formed on the optical disc. Therefore, when the lengths of the gap area 802 and the buffer area 806 are fixed, the length of the VFO area and the dummy data area decreases as the change range of the recording position in the sector increases.

In the fixed change width method 1, the change width is 1 byte regardless of the directory area.
As shown in (a) and (b), the lengths of the VFO area and the dummy data area are each 15 to 16 bytes (or 14 bytes).
The VFO area and the dummy data area are 14 (or 15) bytes in the shortest case. Further, in the fixed change width method 2, since the change width is 10 bytes regardless of the directory area, the lengths of the VFO and the dummy data are 10 to 10 as shown in FIGS. V fluctuates in the range of 20 bytes and V
The shortest FO and dummy data are 10 bytes.

On the other hand, in the variable change width method, since the change width of the recording start point is 10 bytes in the case of the directory area, the lengths of the VFO area and the dummy data area are changed as shown in FIGS. The length varies in the range of 10 to 20 bytes, and the VFO area and the dummy data area have the shortest length of 10 bytes. In the case of the general area, the change width of the recording start point is 1 byte.
The length of the VFO area and the length of the dummy data area when the recording start point is changed as shown in FIGS.
Fluctuates in the range of ~ 16 (or 14 ~ 15) bytes, VF
The O area and the dummy data area are 14 (or 15) bytes in the shortest case.

Using the above conditions, two patterns of recording information are repeatedly rewritten and recorded in the same sector in the directory area and 30 patterns of recording information in the general area. Was examined.

Table 1 shows a comparison between the variable change width method, the fixed change width method 1, and the fixed change width method 2. here,
"Synchronization error" indicates a state in which information cannot be reproduced because the PLL is no longer locked, and "reproduction error" indicates a state in which information cannot be reproduced because complete error correction becomes impossible. Represents.

[0062]

[Table 1]

As shown in Table 1, in the fixed change width method 1, the sector in the general area could be reproduced even with 100,000 repetitions. However, an error occurred 50,000 times in the directory area. For sectors in the directory area,
At this point, the envelope of the reproduced waveform was distorted. From this, it is considered that in the first conventional example, an error occurred due to local deterioration of the recording film because the change width of the recording start point was too small with respect to recording with low randomness.

In the fixed change width method 2, reproduction was possible in any area when the number of repetitions was 50,000 times.
In each case, an error occurred in 100,000 times. In each area, the reproduced waveform after 100,000 repetitive recordings was VF
At least 5 bytes of O have disappeared. For this reason, in the second conventional example, the change amount of the recording start point is large and V
Since the length of the FO area may become short, the ratio of the deteriorated area in the VFO area becomes relatively large due to the deterioration of the recording film at the beginning of the sector, and it is considered that the PLL is not locked and an error has occurred. .

On the other hand, in the variable change width method, reproduction can be performed in any area when the number of repetitions is 50,000.
Even in the general area, reproduction was possible even for 10,000 times. This is thought to be because when recording in the general area, the amount of change in the recording start point was reduced and the length of the VFO area was set longer, so that the ratio of the deteriorated area in the VFO area became relatively smaller. Can be In addition, since the change width of the recording start point is increased in the directory area, local deterioration of the recording film in the data area does not significantly occur, and it is considered that reproduction was possible up to 50,000 times.

As described above, according to the recording / reproducing method for the optical information recording medium according to the present embodiment, the change width of the recording start point can be set in accordance with the recording conditions, so that the deterioration of the recording film can be reduced. In the case of a remarkable directory area, by increasing the change width, it is possible to improve the local deterioration of the recording film at the time of repetitive recording and to increase the number of times of repetitive recording. Further, in the general area where the recording film is less deteriorated with respect to the repetitive recording, the length of the VFO area or the dummy data area is increased to deal with the deterioration of the start and end of the sector, and the number of times of repetitive recording can be increased.

In the embodiment shown in FIG. 1, the delay amount control circuit 106 is provided before the synthesizing circuit 109.
As shown in FIG.
6 may be provided. In the configuration of FIG. 9, a flowchart showing an operation of rewriting a certain sector is as shown in FIG.
The difference from the flowchart of FIG. 2 is that the recording data signal is delayed by the delay amount control circuit 106 after adding the VFO 603 and the dummy data 605 (step 905) (step 909).

The recording format when the change width is 16T (ie, when the first recording timing is set) is as shown in FIG. FIG. 11A shows a recording format when the recording start point is not changed, and FIG. 11B shows a recording format when the recording start point is delayed by 16T. When the change width is 160T (that is, when the second recording timing is set), the recording format is as shown in FIG. FIG. 12A shows the recording format when the recording start point is not changed, FIG. 12B shows the recording format when the recording start point is advanced by 80T, and FIG. 12C shows the recording format when the recording start point is delayed by 80T. is there. 9 is different from FIGS. 7 and 8 in that the recording start points of all of the VFO 603, the data area 604, and the dummy data 605 are changed. As a result, since the lengths of the VFO area and the dummy data area do not become short, there is an advantage that the influence of the deterioration of the start and end of the sector is reduced.

As another embodiment of FIG. 1, FIG.
As shown in (2), two delay amount control circuits 3101 and 3102 may be provided before and after the synthesis circuit 109. The first delay amount control circuit 3101 delays the modulated data signal within the range of change from 0 to 144T, and the second delay amount control circuit 3101
102 delays the recording data signal within a range of change from 0 to 16T. FIG. 32 is a flowchart showing the operation of rewriting a certain sector in the configuration of FIG. In FIG. 32, the first delay amount control circuit 3101 delays the modulated data signal within the range of change from 0 to 144T only in an area where the recording frequency is high (3206). And
VFO 603 and dummy data 605 are added (32
07), the second delay amount control circuit 3102 delays the recording data signal within the range of change from 0 to 16T regardless of the recording frequency (3208), which is different from the flowchart of FIG.

FIG. 34 is a diagram showing a configuration example of the first delay amount control circuit in FIG. In the delay amount control circuit of FIG. 34, the selection unit 3406 includes a selection circuit 3404. The recording control unit 3405 includes a plurality of delay circuits 3401, a clock generation circuit 3402 for generating a clock for operating the delay circuit 3401, and a delay circuit 340 for the modulated data signal 105.
1 is a selector 3403 that determines the input destination to 1.

The delay amount of the delay circuit 3401 is 0, T, 2T, 3T,..., 144T according to the delay clock T.
It is set to be. That is, the interval between the stages in which the amount of delay changes is T, and the width of change in the amount of delay is 144
T.

When the selector 3403 is selected by switching the selection circuit 3404, a 0
The recording timing changes randomly within the range of a change width of ~ 144T (this corresponds to a first recording timing setting function). On the other hand, the selection circuit 3404
It is also possible to output directly without going through 1. In this case, the delay amount is always zero and the recording timing is constant (this corresponds to the second recording timing setting function).

The actual operation of the delay amount control circuit shown in FIG. 34 is as follows. When recording in the general area of the optical disk 113, the selector 3404 is switched to pass through the selection circuit 3403 in accordance with the signal 121 from the identifier detection circuit 119, and the delay circuits 1 to 144T
Select one of the delay amounts of the stages, and
A delay amount of 4T is generated. Then, the destination of the selection circuit 3403 is randomly determined based on the address detection signal 120 from the system control circuit. The destination of the selector is held until the next address is detected.

On the other hand, when recording in the directory area, the selector 3404 is switched so as not to pass through the delay circuit 3401 according to the signal 121 from the identifier detection circuit 119, so that the delay amount is always zero.

FIG. 35 is a diagram showing a configuration example of the second delay amount control circuit in FIG. In the delay amount control circuit of FIG. 35, the recording control unit 3504 includes a plurality of delay circuits 350
1. a clock generation circuit 3502 for generating a clock for operating the delay circuit 3501, and a selector 3503 for determining an input destination of the modulated data signal 105 to the delay circuit 3501
Consists of

The delay amount of the delay circuit 3501 is set to be 0, T, 2T, 3T,..., 16T according to the delay clock T. That is, the interval between the stages in which the amount of delay changes is T, and the range of change in the amount of delay is 16T.

The actual operation of the delay amount control circuit of FIG. 35 is as follows. Regardless of the recording area (or recording frequency) of the optical disk 113, the selection circuit 3503 selects any one of the 16-stage delay amounts of the delay circuits 1 to 16, and generates a delay amount of 0 to 16T. . Then, an address detection signal 120 from the system control circuit is output.
, The destination of the selection circuit 3403 is determined at random. The destination of the selector is held until the next address is detected.

As described above, by using the delay amount control circuits of FIGS. 34 and 35, the number of delay stages is made different between the directory area and the other area, so that the change width of the recording start point of the data area is made different. be able to.

The recording format in the embodiment shown in FIG. 31 will be described. In the embodiment of FIG. 31, the recording format when the change width is 16T (that is, when the first recording timing is set) is as shown in FIG. FIG. 11A shows a recording format when the recording start point is not changed, and FIG. 11B shows a recording format when the recording start point is delayed by 16T. In these cases, VFO60
3, the recording start point of the data area 604 and the dummy data 605 change uniformly by a change width of 1 byte.

When the variation width is 160T (that is, the second
The recording format when the recording timing is set is as shown in FIG. FIG. 33A shows the case where the recording start point is not changed, FIG. 33B shows the case where the recording start point is advanced by 80T, and FIG.
This is the format of the record when delayed. In these cases, the VFO 603 and the dummy data 605 change the recording start point with a change width of 1 byte, and in the data area, the recording start point changes independently with a change width of 10 bytes, which is different from FIGS.

In the embodiment of FIG. 31, when the first recording timing function is set, the VFO 603,
Although the data area 604 and the dummy data 605 change uniformly, the VFO and the dummy data and the data area may change independently. However,
Since it is not necessary to switch the recording area in the second delay amount control circuit when the change is uniform, the second
There is an advantage that the configuration of the delay amount control circuit can be simplified.

When the rotational jitter of the spindle motor 114 is small, or when the laser power control operation of the laser drive circuit 110 is sufficiently fast, the configuration shown in FIG. 9 is more preferable. Conversely, when the rotational jitter 114 of the spindle motor 114 is large or when the laser power control operation of the laser drive circuit 110 is not fast, the configuration shown in FIG. Constant gap region 602 and buffer region 60 regardless of changes in
More preferably, 6 is secured. In the configuration of FIG. 31, the gap area 602 and the buffer area 606 can be appropriately secured. 1, 9 and 31, the number of times of repetitive recording can be increased.

As another method of recording information at high density, a method of recording information on a land between guide grooves has been proposed. In this case, since the guide groove and the land have different cross-sectional shapes of the substrate around the recording mark, the thermal load on the recording mark peripheral portion is different. Therefore, even if the recording is repeated the same number of times, a phenomenon occurs in which the degree of deterioration of the recording film is different between the guide groove and the land.

In order to solve such a problem, the recording / reproducing apparatus may be configured as shown in FIG. FIG. 13 differs from FIG. 1 in that the variation amount of the recording start point is set by the delay amount control circuit based on the identification result of the land / guide groove identifier detection circuit 1201. In this case, the width of change is different between when recording on the land and when recording on the guide groove. Then, an effect similar to that of the configuration in FIG. 1 is obtained, in which the number of times of repetitive recording is further increased.

Further, in order to record information at a high density, pulse width modulation in which information is provided at both edges of a recording mark.
(Pulse Width Modulation) system has been proposed. However, the pulse width modulation is a pulse position modulation (Pulse PDM) that gives information to the position (or interval) of a recording mark.
As compared with the osition modulation) method, a long recording mark is often formed, so that the recording film tends to deteriorate quickly. Furthermore, in the pulse width modulation, information cannot be reproduced unless the edge of the recording mark can be accurately detected, so that the information reproducing capability becomes more sensitive to deterioration of the recording film. That is, even with the same deterioration of the recording film, it is more difficult to accurately reproduce information by the pulse width modulation.

In order to solve such a problem, the recording / reproducing apparatus may be configured as shown in FIG. FIG. 14 differs from FIG. 1 in that the change width of the recording start point is set by the delay amount control circuit 106 based on the identification result of the modulation scheme identifier detection circuit 1301. In this case, the change width of the recording start point differs between when recording by pulse width modulation and when recording by pulse position modulation. Then, an effect similar to that of the configuration in FIG.

A single recording / reproducing apparatus can record information on a plurality of recording media having different linear densities (also referred to as track-direction recording densities) or a plurality of recording areas in a single medium. Proposed. However, when recording at a high linear density, information cannot be reproduced unless the edge (or position) of the recording mark can be detected more precisely.
The information reproducing ability becomes more sensitive to the deterioration of the recording film. That is, even if the recording film is deteriorated to the same extent, it is difficult to accurately reproduce information when recording is performed with a high linear density.

To solve such a problem, FIG.
May be configured using a linear density identifier detection circuit instead of the modulation method identifier detection circuit 1301. In this case, the change width of the recording start point is different between when recording is performed with a high linear density and when recording is performed with a low linear density. Then, an effect similar to that of the configuration of FIG. 1 in which the number of times of repetitive recording is further increased is obtained.

It has been proposed that a single recording / reproducing apparatus records data on a plurality of recording media having different track pitches (ie, pitches between guide grooves) or on a plurality of recording areas in a single medium. However, when recording is performed in an area having a narrow track pitch, the influence of recording film deterioration due to recording on adjacent guide grooves is easily affected, so that the information reproducing ability is more sensitive to the recording film deterioration.
That is, even if the recording film is deteriorated to the same extent, it is difficult to accurately reproduce information by recording in an area having a high track pitch.

To solve such a problem, FIG.
, A track pitch identifier detection circuit may be used instead of the modulation method identifier detection circuit 1301. In this case, the change width of the recording start point differs between when recording is performed in an area having a high track pitch and when recording is performed in an area having a low track pitch. Then, an effect similar to that of the configuration of FIG. 1 in which the number of times of repetitive recording is further increased is obtained.

If the above-described repetitive recording density, modulation method of modulated data signal, linear density, and track pitch are different for each recording medium, the identifier is recorded on the cartridge holding the recording medium. However, the same effect can be obtained.

The change width of the recording start point, the number of steps, the interval, the recording format, and the like are not limited to those described in this embodiment, and appropriate values may be set according to the recording conditions and the medium. It is possible. Furthermore, it is needless to say that the change width of the recording start point may be changed to three or more types by combining the modulation method, the frequency of the repetitive recording, the land / groove, and the like as needed.

(Embodiment 2) Next, a recording / reproducing method for an optical information recording medium according to another embodiment of the present invention will be described. FIG. 15 is a diagram showing a configuration of a recording / reproducing apparatus according to the present embodiment, and FIG. 16 is a flowchart for explaining an operation of rewriting recording information of a certain sector in the present embodiment.

15 and 16 are different from the conventional configuration / operation in that the reordering method determining means 1401 arranges the reordering method (recording method) of the recording information 102 emitted as a signal before adding error correction information. ) Is randomly determined (step 1503), the reordering means 1402 divides and rearranges (converts) a series of recording information to obtain conversion information 1405 (step 1504), and restores the rearranged recording information. Is newly added as re-arrangement information as identification information (step 1505).

FIG. 17 is a flowchart for explaining the operation of reproducing the recorded information recorded in a certain sector in this embodiment. 15 and FIG. 17 are different from the conventional configuration / operation in that after performing error correction and deinterleaving (step 1604), the rearrangement information detection circuit 14
03, the information for restoring the recorded information is detected as identification information (step 1605), and the restored information is restored by the restoring unit 1404 by the restoration method selected based on the detection result (step 1606).

An example of the operation of rearranging and restoring recording information by the rearranging method determining unit 1401, the rearranging unit 1402, and the restoring unit 1404 will be specifically described with reference to FIGS.

The division and rearrangement of the recording information are performed as follows. For a series of recording information as shown in FIG. 18 (a), the position to be divided is determined at random. Then, the recording information is divided, replaced, and rearrangement information indicating the position of the division is added as identification information after the conversion information to obtain the state shown in FIG. For example, when the recording information is divided and rearranged at the 20th byte (this corresponds to a conversion method), information indicating the “20th byte” is added to the conversion information. The reordering information does not necessarily need to be recorded in each sector, but may be recorded in a directory area (directory area). Also, the reordering method for one rewrite need not necessarily be different for each sector, and the reordering method may be the same for a series of rewrites for a plurality of sectors. Then, error correction information addition and interleave processing are performed.

At the time of reproduction, as shown in FIG. 19A, after performing error correction and deinterleave processing, the rearrangement information added at the end of the conversion information is detected. For example, if the rearrangement information is information indicating the “20th byte”, the rear end 20 bytes of the conversion information are divided and added to the head (this corresponds to a restoration method), thereby obtaining FIG. ), The original record information is obtained.

The byte number at which to divide the data is determined randomly by the rearranging means 1402 in FIG. 15 every time the data is recorded in the corresponding sector. Therefore, even if the same recording information is repeatedly recorded in the same sector, it always differs. Recording is performed using the modulated data signal. As a result, V
The recording data signals other than the FO area and the RESYNC area are always recorded on the optical disc 113 by using different recording data signals. The probability that the recording mark 2501 is formed in the guide groove 2302 of the optical disc 113 depends on any position of the recording area in the sector. Are also approximately equal. therefore,
Local damage that has occurred in the recording area due to multiple rewrites is eliminated.

FIG. 20 shows a configuration example of the rearranging method determining means 1401 and the rearranging means 1402 for realizing the above rearranging operation. The random number generation circuit 2901 generates a random number using the rearrangement timing signal as a trigger. In the case where each sector of the optical disk is used for random access, even if a counter circuit is used instead of the random number generation circuit, it is substantially the same as generating a random number.
Based on the random number from the random number generation circuit 2901, the address preset circuit 2902 reads the initial memory address read from the memory 2903 (in the above rearrangement operation example, the memory corresponding to the 20th byte from the head of the record information stored in the memory 2903) Is set in the memory 2903. After temporarily storing the recording information, the memory 2903 outputs the recording information in order from the set initial memory address, and after outputting the rear end of the recording information, outputs the recording information from the top of the recording information, thereby rearranging the recording information. Will be issued. Further, identification information indicating the initial memory address is combined by the combining circuit 2904.

FIG. 2 shows a configuration example of the reordering information detecting circuit 1403 and the restoring means 1404 for realizing the above restoring operation.
It is shown in FIG. The detection circuit 3001 detects the identification information from the conversion information and the identification information after performing the error correction / deinterleaving. The hold circuit 3002 holds the identification information until the next identification information is detected and supplies the identification information to the address preset circuit 3003. The address preset circuit 3003 sets an initial memory address (an address in the memory corresponding to the 20th byte from the rear end of the recording information stored in the memory 2903 in the above-described restoring operation example) in the memory 3004. The memory 3004 temporarily stores the conversion information, sequentially outputs the conversion information from the set initial memory address, and outputs the conversion information from the beginning after outputting the rear end of the conversion information. The information will be restored.

Here, the configuration of the system control circuit is shown in FIG.
This will be described with reference to FIG. 22 is different from the conventional system control circuit in that the rearrangement timing generating circuit 2801 provides the rearrangement timing signal to the rearrangement method determining unit 1401 according to the address information and the address information detection signal from the address information detection circuit 2603. Is a point.

The effects of this embodiment will be described below with reference to specific examples. The conditions for recording on the optical disk were the same as in the previous embodiment. For the disk substrate of the optical disk 113, a polycarbonate resin having a diameter of 130 mm was used.
On this resin substrate, irregular phase pits were preformatted in advance as address information, and recording guide grooves were formed in the sector areas. A protective film, a photosensitive recording film, a protective film, and a reflective film are formed on a substrate by sputtering.
A layer was formed, and a protective substrate was adhered thereon.

In this embodiment, ZnS—Si is used as the protective film.
O ₂ , Te-Sb-Ge as a photosensitive recording film, and Al as a reflective film were used. Then, this disk is rotated at a linear velocity of 5 m / s by the spindle motor 113, and the wavelength 68
Recording was performed by converging a 0 nm laser beam with an objective lens having a numerical aperture (NA) of 0.6. The power of the laser beam during recording and reproduction was set to Pp = 10 mW, Pb = 4 mW, and Pr = 1 mW.
The modulation method of the recording information used was (1,7) RLL pulse width modulation. The shortest mark length is 0.6 μm.

Using the above conditions, the same recording information was repeatedly recorded in the same sector 100,000 times. Then, a comparison was made between the recorded information rearrangement method in which the recording information was divided into two at random positions and rearranged for each repetitive recording, and the measured error rate of the reproduced signal in the conventional system without rearrangement. In either method, the recording information to be recorded in one sector is 500 bytes, and in the recording information rearranging method,
The division position was randomly determined in byte units. Table 2 shows the comparison results.

[0106]

[Table 2]

As is clear from Table 2, the recording information rearranging method has an excellent effect that the error rate after 100,000 repetitive recordings is low and the number of repetitive recordings can be increased.

As described above, according to the recording / reproducing method of the optical information recording medium according to the present embodiment, even when the same record information is repeatedly rewritten at the same position on the disc, conversion into a plurality of different patterns is possible. Since the recording data signal has a different pattern, damage to a specific position of the recording film is dispersed, and deterioration of the recording film due to rewriting many times can be suppressed.

The number of divisions of the recording information and the like are not limited to those described in the present embodiment, and appropriate values can be set according to recording conditions and media. Also,
The method of converting a series of recording information is not limited to the method described in the present embodiment, but may be any method that converts the same recording information into any of two or more different patterns. .

For example, as shown in FIG. 23, a plurality of different interleaving methods may be provided in an interleaving circuit. In this configuration, at the time of recording, one of the interleaving methods (103, 1903) is randomly selected by the first selection circuit 1902 to perform an interleaving process, and information indicating the interleaving method is added to the conversion information as identification information. This is different from FIG. Also,
At the time of reproduction, one of the deinterleaving methods (117, 1904) is performed based on the information indicating the interleaving method detected by the interleaving method detecting circuit 1906.
Is different from FIG. 15 in that the deinterleaving process is performed by randomly selecting The interleaving method determining means 1901 is configured by a random number generating circuit and a counter circuit, similarly to the sorting method determining means 1401 in FIG.

FIG. 24A shows an example of the state of the recorded information before performing the interleave processing. FIG. 24 (b)
Indicates a state in which information indicating an interleaving method is added after the interleaving process. FIG. 24C shows an example of the state of the recording information before the deinterleave processing is performed. FIG. 24D shows a state after deinterleaving processing is performed based on information indicating the interleaving method. In this case, the division and rearrangement processing of the recording information can be used also as the interleave processing, so that the configuration of the recording / reproducing apparatus can be simplified.

The following method may be used to convert the same recording information into conversion information by two or more different conversion methods. FIG. 25 is a configuration showing an example of generating conversion information from recording information by two or more different scrambling methods. In the present configuration, a method of performing a bit shift for each recording information unit is used as a scrambling method. In this configuration, at the time of recording, the number of bits to be shifted is randomly determined by the bit shift method determining unit 2101, and the bit shift circuit 2102 sets a fixed number of bits for each specific recording information unit (for example, one byte of recording information). The difference from FIG. 15 is that conversion information 1405 is obtained by performing a shift process (this corresponds to a conversion method), and information indicating the bit shift amount of each recording information unit is added as identification information. At the time of reproduction, the inverse bit shift number is selected based on the information indicating the bit shift number detected by the bit shift information detection circuit 2103, and the inverse bit shift circuit 2104 performs an inverse bit shift process for each fixed bit (this is a Figure 1
Different from 5. Bit shift method determining means 2101
Is composed of a random number generation circuit and a counter circuit, like the sorting method determination means 1401 in FIG.

FIG. 26A shows an example of the state of the recorded information before the bit shift processing. FIG. 26B shows a state in which information indicating the bit shift method has been added after the bit shift processing. FIG. 26C shows an example of the state of the recorded information before the reverse bit shift processing is performed. FIG. 26D shows a state after the inverse bit shift processing is performed based on the information indicating the bit shift method. In this case, it is not necessary to secure many buffer memories for the rearrangement, and the configuration of the recording / reproducing apparatus can be simplified.

Further, in each of the above-described second embodiments, if the recording is started while the recording start point of the modulated data signal in the sector is changed at random, the RESYNC area in the data area is also recorded at a different position. Therefore, the number of times of repetitive recording can be further increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of rewriting recording information of a certain sector in the recording / reproducing apparatus of FIG.

FIG. 3 is a block diagram showing a configuration of a system control circuit in the recording / reproducing apparatus of FIG. 1;

FIG. 4 is a block diagram showing a configuration of a delay amount control circuit in the recording / reproducing apparatus of FIG. 1;

FIG. 5 is a block diagram showing another configuration of the delay amount control circuit in the recording / reproducing apparatus of FIG.

FIG. 6A shows a relationship between a change width of a recording start point and an error rate in the case of a general area, and FIG. 6B shows a relationship between a change width of a recording start point and an error rate in the case of a directory area. Diagram shown

FIG. 7 is a diagram showing a recording format when the change width is 16T in the recording / reproducing apparatus of FIG. 1;

FIG. 8 is a diagram showing a recording format when the change width is 160T in the recording and reproducing apparatus in FIG. 1;

FIG. 9 is a block diagram showing a modification of the recording / reproducing apparatus of FIG. 1;

10 is a flowchart showing an operation of rewriting recording information of a certain sector in the recording / reproducing apparatus of FIG.

FIG. 11 is a diagram showing a recording format when the change width is 16T in the recording and reproducing apparatus of FIG.

12 shows a change width of 160T in the recording / reproducing apparatus of FIG. 9;
Figure showing the recording format when

FIG. 13 is a block diagram showing another modification of the recording / reproducing apparatus of FIG. 1;

FIG. 14 is a block diagram showing another modification of the recording / reproducing apparatus of FIG. 1;

FIG. 15 is a block diagram showing a configuration of a recording / reproducing device according to a second embodiment of the present invention.

16 is a flowchart showing an operation of rewriting recording information of a certain sector in the recording / reproducing apparatus of FIG.

17 is a flowchart showing an operation of reproducing recording information of a certain sector in the recording / reproducing apparatus of FIG.

18 is a diagram showing a state before and after rearrangement of recorded information in the recording / reproducing apparatus of FIG.

19 is a diagram showing a state before and after restoring recorded information in the recording / reproducing apparatus in FIG.

20 is a block diagram showing a configuration of a rearranging method determining unit and a rearranging unit in the recording / reproducing apparatus of FIG.

21 is a block diagram showing a configuration of a rearrangement information detecting circuit and a restoring unit in the recording / reproducing apparatus of FIG.

FIG. 22 is a block diagram showing a configuration of a system control circuit in the recording / reproducing apparatus of FIG.

FIG. 23 is a block diagram showing a modification of the recording / reproducing apparatus of FIG.

FIG. 24 is a diagram showing an example of interleaving and deinterleaving processing in the recording / reproducing apparatus of FIG. 23;

FIG. 25 is a block diagram showing another modified example of the recording / reproducing apparatus of FIG.

26 is a diagram showing an example of bit shift and reverse bit shift processing in the recording / reproducing apparatus of FIG. 25.

FIG. 27 is a sectional view showing a conventional optical information recording medium.

FIG. 28 is a block diagram showing a configuration of a conventional recording / reproducing apparatus.

FIG. 29 is a diagram showing a recording data signal, a laser light intensity modulation state, a recording state on an optical disc, and a recording format in a conventional recording / reproducing method.

30 is a block diagram showing a configuration of a system control circuit in the recording / reproducing apparatus of FIG.

FIG. 31 is a block diagram showing a modification of the recording / reproducing apparatus of FIG. 1;

FIG. 32 is a flowchart showing an operation of rewriting recording information of a certain sector in the recording / reproducing apparatus of FIG. 31;

33 shows a change width 160 in the recording / reproducing apparatus of FIG.
Layout diagram illustrating the format of recording at T

FIG. 34 shows a first example of the recording / reproducing apparatus of FIG. 31;
Block diagram showing the configuration of the delay amount control circuit of FIG.

FIG. 35 shows a second example in the recording / reproducing apparatus of FIG. 31;
Block diagram showing the configuration of the delay amount control circuit of FIG.

[Explanation of symbols]

 Reference Signs List 101 system control circuit 102 information signal 103 error correction / interleave circuit 104 modulation circuit 105 modulated data signal 106 delay amount control circuit 107 dummy data generation circuit 108 synchronization signal generation circuit 109 synthesis circuit 110 laser drive circuit 111 laser drive signal 112 optical head 113 Optical disc 114 Spindle motor 115 Reproduction signal processing circuit 116 Demodulation circuit 117 Error correction / deinterleave circuit 118 Recording data signal 119 Recording frequency identification means 120 ID detection signal 121 Recording frequency identification signal 122 RF signal 301 Delay circuit 302 First clock generation circuit 303 second clock generation circuit 304 selector 305 selection circuit 306 recording control unit 307 selection unit 401 delay circuit 402 clock generation circuit 403 Selector 404 second selector 405 selection circuit 406 recording control unit 407 selection unit 601 ID area 602 gap area 603 VFO area 604 data area 605 dummy data area 606 buffer area 607 sector 1401 sorting information determining means 1402 sorting means 1403 Replacement information detecting means 1404 restoring means 1405 recording signal

Claims (14)

[Claims] 1. A recording / reproducing method for a rewritable optical information recording medium having a sector structure format, wherein modulation is performed to convert an information signal into a modulation data signal corresponding to a recording pattern on the optical information recording medium. Selecting a first recording timing or a second recording timing; and, when the first recording timing is selected in the selecting step, setting a recording start point of the modulated data signal to a sector position. When the second recording timing is randomly changed within a predetermined range of change and the second recording timing is selected in the selecting step,
A recording control step of randomly changing a recording start point of the modulated data signal with respect to a sector position within a range of a change width larger than the predetermined change width, at least when the second recording timing is selected, A recording / reproducing method for an optical information recording medium, wherein a recording start point of the modulated data signal and a VFO recording start point are independently changed with respect to a sector position. 2. An identification step for detecting an identifier recorded on the optical information recording medium, wherein a first recording timing or a second recording timing is selected in the selection step based on an identification result of the identification step. 2. The recording / reproducing method for an optical information recording medium according to claim 1, wherein: 3. An identification step for detecting an identifier recorded on a cartridge holding the optical information recording medium, wherein a first recording timing or a second recording in the selection step is performed based on an identification result of the identification step. 2. The recording / reproducing method for an optical information recording medium according to claim 1, wherein a timing is selected. 4. The method according to claim 1, wherein the identifying step identifies a plurality of optical information recording media having different repetition recording frequencies or a plurality of areas on the optical information recording medium having different repetition recording frequencies. A method for recording / reproducing an optical information recording medium according to any one of claims 1 to 3. 5. The method according to claim 1, wherein the identifying step identifies whether a sector to be recorded on the optical information recording medium is a directory area or a non-directory area. The recording / reproducing method of the optical information recording medium according to the above item. 6. The method according to claim 1, wherein the identifying step identifies whether a sector to be recorded on the optical information recording medium is on a groove or a land. Recording / reproducing method of the optical information recording medium according to the above. 7. A recording / reproducing method for a rewritable optical information recording medium having a sector structure format, comprising: an identification step for identifying a plurality of optical information recording media having different recording densities; A modulation step of converting to a modulation data signal corresponding to a recording pattern on an optical information recording medium; a selection step of selecting a first recording timing or a second recording timing based on an identification result of the identification step; When the first recording timing is selected in the selecting step, at least the recording start point of the modulated data signal is changed at random with respect to the sector position within a predetermined change width, and the second recording step is performed in the selecting step. When the recording timing is selected, at least the recording start point of the modulated data signal is set in a range of a change width larger than the predetermined change width with respect to the sector position. Method of recording and reproducing an optical information recording medium, characterized in that inner and a recording control step of changing at random. 8. When at least a second recording timing is selected, a recording start point of the modulated data signal and a VF
8. The recording / reproducing method for an optical information recording medium according to claim 7, wherein the recording start point of O is independently changed within a predetermined range of change. 9. The recording / reproducing method for an optical information recording medium according to claim 7, wherein in the identification step, an identifier recorded in a predetermined area of the optical information recording medium is detected. . 10. The recording / reproducing method for an optical information recording medium according to claim 7, wherein in the identification step, an identifier recorded on a cartridge holding the optical information recording medium is detected. . 11. The identification step, wherein a plurality of optical information recording media different in at least one of a linear density and a track pitch are identified.
Or a recording / reproducing method for an optical information recording medium according to item 8. 12. The recording / reproducing method for an optical information recording medium according to claim 7, wherein in the identification step, a plurality of optical information recording media having different modulation methods are identified. 13. A recording / reproducing apparatus for a rewritable optical information recording medium having a sector structure format, comprising: identification means for identifying a plurality of optical information recording media having different recording densities; A modulation circuit that converts the modulated data signal into a modulated data signal corresponding to a recording pattern on a medium; and a recording start point of the modulated data signal provided from the modulation circuit, which is randomly delayed within a predetermined variation range with respect to the sector position. A first delay means for causing the modulation circuit to start recording the modulated data signal from the modulation circuit within a range of a change width larger than a predetermined change width by the first delay means with respect to the sector position. A recording control unit including a second delay unit for delaying the first delay unit, and a selection circuit for selecting the first or second delay unit based on the identification result of the identification unit. Recording and reproducing apparatus of the optical information recording medium. 14. A synthesizing circuit for arranging a VFO immediately before a modulation data signal and arranging dummy data immediately after the modulation data signal, and setting a recording start point of the VFO provided from the synthesizing circuit to the sector position. Third delay means for randomly delaying within a range of a predetermined change width, and a predetermined change width of the VFO recording start point given from the synthesizing circuit with respect to the sector position by the third delay means A second recording control unit including a fourth delay unit that randomly delays within a range of a larger change width; a first or second delay unit based on an identification result of the identification unit; 14. The recording / reproducing apparatus for an optical information recording medium according to claim 13, further comprising a selection circuit for selecting a fourth delay unit.