• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the optical disc according to the present invention, a sector is sequentially formed by a first gap field, a first guard data recording field, a data recording field consisting of a synchronization signal and user data, a second guard data recording field, and a second gap field. And the lengths of the first and second gap fields and the lengths of the first and second guard data recording fields are changed randomly each time the recording is performed, and the amount of change of the first and second gap fields is changed to the first and second guard fields. It is set smaller than the amount of change in the data recording field, so that the optical disc medium deterioration of all sectors and all marks due to repetitive recording can be suppressed.
    公开号:KR20000048935A
    申请号:KR1019990702972
    申请日:1997-10-06
    公开日:2000-07-25
    发明作者:이시다다카시；구보타신지；쇼지마모루；이시다신지
    申请人:마츠시타 덴끼 산교 가부시키가이샤；
    IPC主号:
    专利说明:

    Optical discs, optical disc devices, and optical disc recording methods {OPTICAL DISC, OPTICAL DISC DEVICE, AND METHOD FOR RECORDING AN OPTICAL DISC}
    The present invention relates to an optical disc, an optical disc apparatus and an optical disc recording method for recording a digital signal and reproducing the digital signal in a sector unit of the optical disc.
    Description of the Prior Art
    Optical discs are currently widely distributed as read-only recording media such as compact discs (CD) used in audio and video and rewritable recording media such as mini discs (MD). In addition, as an external memory device of a computer, rewritable 3.5-inch magneto-optical discs and 5-inch phase change optical discs (PD) have become popular.
    In the future, as a recording medium for multimedia, a digital video disc (DVD) using a phase change optical disc is about to be sold. One of the advantages of the phase change optical disk is that only one laser beam is needed as the recording means to overwrite the information signal. That is, if the modulated laser output is irradiated to the recorded information track as a function of switching the information signal between the recording level and the erasing level, a new signal can be recorded while erasing the existing information signal.
    The format structure of such an optical disc will be described with reference to FIG. In Fig. 18, reference numeral 1 denotes an optical disc, reference numeral 2 denotes a track on the optical disc 1, and reference numeral 3 denotes a sector obtained by dividing the track into a plurality of fields. Each sector 3 has a header field 4 containing track and sector address information, a gap field 7 without a recorded signal, a data recording field 5 for recording user data, and incorrect results of motor rotation. It consists of a buffer field 6 for absorbing.
    The header field 4 is usually in the form of a prepit and is not used for writing. Reference numeral 4a denotes a synchronization signal VFO for synchronization, 4b denotes an address mark for detecting a header field as a special recording pattern that does not appear on the modulation pattern, and 4c denotes a physical position of the sector. A field containing a Physical Identification Address (PID) having address information (4d) is ID Error Detection (IED) for detecting an address error. The header field consisting of blocks 4a to 4d may be composed of a plurality of header fields in order to increase reliability.
    The data record field 5 consists of a synchronization signal VFO 5b and user data 5c for synchronization.
    An optical disk apparatus for recording signals and reproducing signals by means of a recordable optical disk will now be described with reference to FIG. In Fig. 19, reference numeral 1 denotes an optical disc, 10 denotes an optical head for recording a signal on a track of the optical disc 1 and reproduces the signal, and 11 denotes a semiconductor on a track of the optical disc. A servo control circuit for focusing the optical beam of the laser, 12 is a laser drive circuit for controlling the light output of the semiconductor laser, and 13 is for recording coded data. A data modulation circuit for digitally modulating in a suitable form, and 14 is a VFO generating circuit for generating a VFO as a synchronous signal. Reference numeral 15 denotes an encoding circuit for performing error detection encoding of recorded data, 16 a write control circuit for controlling write timing, and 17 an address detection for detecting an address signal from a reproduced signal. Circuit 18 is a system control circuit for controlling the operation of the entire optical disk device composed of microprocessors and other related circuits, and 19 is data to be written.
    The data encoded by the encoding circuit 15 is modulated by the data modulation circuit 13 and output from the data modulation circuit 13 as modulated data. The synchronizing signal VFO generated by the VFO generating circuit 14 is added to the beginning of this modulated data, transmitted to the laser drive circuit 12, and recorded on the optical disk 1.
    However, in such a rewritable light-operative optical disc, the number of repetitive recordings is limited because the recording medium deteriorates due to the thermal load upon repeated light exposure. In general, such deterioration phenomena tends to become more prevalent in the deterioration area as the number of repeated recordings increases. Degradation can be divided into two types.
    (1) Degradation phenomenon in each sector occurring at the beginning end (recording start position) and terminating end (recording end portion) of the recording field of the sector as the recording is repeated in the sector.
    (2) Deterioration phenomenon in each mark occurring in the mark area by repeatedly recording mark rows of the same pattern at the same position of the sector.
    First, in the phenomenon of deterioration in each sector, as recording is repeated, deterioration occurs gradually at the recording foils at the leading end and the end of the recording field in the sector, and this defect (the associated laser on the optical disk) It extends from the front end to the forward direction, and from the end to the front of the sector (for the reverse direction of the associated laser travel direction on the optical disc).
    This phenomenon is considered to occur because the phenomenon of movement of the recording foil substance in the track direction occurs when the recording foil is in the fused state. For example, by moving the recording foil material in the forward direction of the sector, dissolution and solidification are repeated a plurality of times, whereby the recording foil material is accumulated at the portion of the recording start point at which the thermal load of the recording foil suddenly changes, This recording foil material is reduced in thickness at the recording endpoint portion. As a result, the thickness of the film between the recording start point and the end point becomes uneven, the thermal or optical properties deteriorate, the film peels off, and / or the quality of the reproduction signal at the data tip or end deteriorates, It interferes with the recording of the correct information and the reproduction of the information.
    Next, in the deterioration phenomenon at each mark, as recording is repeated, a defect occurs in the recording foil when recording the same pattern, and this defect extends forward and backward of the mark portion.
    That is, when the same data is repeatedly recorded in the same sector, dissolution and solidification are repeated a plurality of times in some areas, while other areas are not dissolved at all.
    In general, when rewriting data recorded on an optical disc, the data is rewritten in sector units. Therefore, if there is a change in information in a part of the sector, the entire sector is rewritten. In the TOC (Table of Contents) field or the directory field in which information corresponding to the table of contents of the information recorded on the disk is recorded, particularly, similar data is frequently recorded repeatedly and the rewriting frequency is high. Also in the normal data sector, the same data is repeatedly recorded in the synchronization signal section VFO or the like, and in this case, the above-described degradation phenomenon occurs. As a result, in the boundary region between the repeatedly dissolved and solidified portion and the portion that is not dissolved at all, there is a variation in the film thickness of the recorded film, resulting in deterioration of the thermal and optical properties and deterioration in the quality of the reproduction signal of this portion. Prevents recording and reproduction of normal information.
    Summary and purpose of the invention
    The present invention has been made to solve the above problem, and relates to an optical disc for recording data and reproducing data in sector units. It is an object of the present invention to reduce the degradation of the recording foil of an optical disc in all sectors and all marks due to repeated recording, simplify the associated signal processing system, and suppress the degradation phenomenon for accurate recording and reproduction of information. It is possible to provide an optical disk, and an optical disk device and a recording method of the optical disk.
    In order to achieve these and other objects, according to a first aspect of the optical disk of the present invention, a header field including a sector identification signal and a data recording field including a synchronization signal are used for each of a plurality of sectors for dividing a track. Provided in the sector, a guard data record field for recording specific guard data is provided between the header field and the data record field.
    By this guard data recording field, the synchronization signal can be protected from degradation of the medium due to repeated recording.
    According to the second aspect of the optical disk of the present invention, the guard data of the guard data recording field is the same as the recording pattern of the synchronization signal field, and the phase of the recording pattern is near the boundary between the guard data recording field and the synchronization signal field. Continues.
    As a result, the guard data recording field can be used substantially as a synchronization signal field, and the stability of synchronism acquisition because the lock-in range of synchronization can be further extended than the synchronization signal field. Can be improved in view of medium degradation due to repetitive recording.
    According to the third aspect of the optical disk of the present invention, the recording portion of the guard data recording field changes randomly every time recording.
    As a result, since the mark data recorded on the recording medium by repeatedly recording the guard data recording field for recording the same signal pattern is randomly shifted every time recording, deterioration of the recording medium can be prevented. have.
    According to a fourth aspect of the optical disk of the present invention, the sector structure sequentially records data including a first gap field having no signal, a first guard data recording field for recording guard data, a synchronization signal, and user data. Field, a second guard data record field and a second gap field, wherein the total length of the first and second gap field is constant, the total length of the first and second guard data record field is constant, In recording, the lengths of the first gap field and the first guard data recording field change randomly at the time of recording, and the change amount of the first gap field is set smaller than the change amount of the first guard data recording field.
    Accordingly, since the first and second gap fields and the first and second guard data recording fields change randomly at the time of recording, medium degradation due to repetitive recording in all sectors and all marks can be suppressed.
    In addition to the fourth aspect, according to the fifth aspect of the optical disk of the present invention, the resolution of the variation amount of the first gap field is in channel bit units, and the resolution of the variation amount in the first guard data recording area is in bytes. (byte unit).
    Thus, while maintaining the realization of data processing on the signal processing system easily, the medium deterioration due to repetitive recording in all sectors and all marks can be suppressed.
    In addition to the fourth aspect, according to the sixth aspect of the optical disk of the present invention, the signal polarity of the guard data and the data recording field data change randomly every time they are recorded.
    As a result, even with a limited amount of random shift, medium degradation in all sectors and all marks can be suppressed.
    As mentioned below, the optical disk apparatus of the present invention can include means for recording to and reproducing from the optical disk, thereby suppressing media degradation due to repetitive recording in all sectors and all marks.
    Since the optical disc recording method of the present invention includes a method for recording on these optical discs, it is possible to suppress medium deterioration due to repetitive recording in all sectors or all marks.
    1 is a diagram showing a format structure of an optical disk according to Embodiment 1 of the present invention;
    2 (a) to 2 (c) show the deterioration of the recording medium and the synchronization signal field VFO at the recording start point during repeated recording;
    3 is a block diagram of an optical disc according to Embodiment 2 of the present invention for recording to and reproducing from an optical disc having a guard data recording field;
    4A to 4D are diagrams showing a synchronization signal portion in which the guard data of the guard data recording field has a pattern different from that of the synchronization signal VFO;
    5A to 5D are diagrams showing a synchronization signal portion of an optical disc of Embodiment 3 in which the guard data of the guard data recording field has the same pattern as the synchronization signal VFO;
    Fig. 6 is a block diagram of an optical disc according to the fourth embodiment for recording and reproducing the recording pattern of the guard data recording field in the same way as the synchronization signal field VFO;
    7 is a flowchart for explaining an optical disk recording method according to Embodiment 5 in which the recording pattern of the guard data recording field is recorded and reproduced in the same manner as the synchronization signal field VFO;
    8A to 8D are diagrams showing the state of a sector of an optical disc according to the sixth embodiment for randomly changing each time a sector recorder is recorded;
    Fig. 9 is a block diagram of the optical disk apparatus according to the seventh embodiment for recording a signal on the optical disk and reproducing the signal from the optical disk by changing randomly every time the sector recording unit is recorded;
    FIG. 10 is a diagram showing a format of an optical disc for recording and reproduction by randomly changing each time recording portions of the first and second gap fields and the first and second guard data recording fields are recorded in all sectors; FIG.
    Fig. 11 shows the optical disk apparatus according to the eighth embodiment for recording and reproducing by randomly changing each time the recording portions of the first and second gap fields and the first and second guard data recording fields are recorded in all sectors. Block Diagram,
    12 is a block diagram illustrating an example of a second random change circuit;
    13 is a flowchart for explaining an optical disc recording method according to the eighth embodiment;
    14A to 14D are diagrams showing modes of sectors when the first and second gap fields and the first and second guard data recording fields are randomly changed;
    15 (a) to 15 (b) show a deterioration area of a sector when the first and second gap fields and the first and second guard data recording fields are randomly changed;
    16A to 16C are diagrams for explaining the polarity and recording stage of a recording signal on an actual optical disk;
    17 is a result graph shown to explain the result of the random shift according to the present invention;
    18 is a format diagram of a conventional recordable optical disc;
    Fig. 19 is a block diagram of a conventional recordable optical disc device.
    Embodiment of the Invention
    Hereinafter, embodiments of the present invention will be described with reference to the drawings.
    (Example 1)
    1 is a diagram showing the format structure of an optical disk according to the first embodiment of the present invention. The description of the parts shown in the format structure of FIG. 18 related to the prior art will be omitted.
    Compared with the prior art, the added part and the modified part are provided as a guard data record field 100 for recording the guard data, and are provided between the header field 4 and the data record field 5. The guard data record field 100 is provided after the gap field 7 and immediately before the data record field 5. Since the signal is not recorded in the gap field 7, the recording of the signal in the sector starts in the guard data recording field 100.
    Referring to Figs. 2A to 2C, the relationship between the deterioration of the recording medium at the recording start point and the synchronization signal field VFO in the optical disk having the format structure of Fig. 1 will be described when repeating recording. .
    2A to 2C show the degradation mode of the recording medium adjacent to the recording start point of the data recording field 5, and FIG. 2A shows only one repetition, and FIG. ) Represents 50,000 repetitions, and FIG. 2C shows 100,000 repetitions.
    In the initial stage of one repetition of Fig. 2A, since the guard data recording field 100 at the recording start point of the sector is free from medium deterioration, there is no problem. Thus, in the initial state, the interval of the guard data recording field is assumed to be T 1 , and the interval of the synchronization signal field VFO is assumed to be T 2 .
    As shown in Fig. 2B, after 50,000 repetitions, the media deterioration indicated by the reference numeral 30 in the TC 1 section occurs at the beginning of the guard data recording field 100, and the guard data is generated. The recording field 100 is shortened by the TC 1 section, which is the length of the medium degradation 30, to be T4. However, when media degradation occurs, the guard data recording field 100 in which the guard data is recorded is shortened by that length. The synchronization signal field VFO required for synchronization is completely free from medium degradation 30, so that the synchronization interval T 2 remains the same as the initial state. Thus, as in the initial state, stable synchronization acquisition is realized.
    As shown in Fig. 2C, after 100,000 repetitions, the medium deterioration 30 at the head of the guard data recording field 100 is extended to the TC 2 section. As a result, the guard data recording field 100 is shorter with T 5 . However, only the guard data recording field in which the guard data is recorded is shortened by that length, and the synchronization signal field VFO necessary for synchronization is completely freed from the medium degradation 30, so that the synchronization section T 2 is the same as in the initial state. Remains. Thus, as in the initial state, stable synchronization acquisition is realized.
    As described, according to this embodiment, by providing the guard data recording field 100 for recording the guard data between the header field and the data recording field including the synchronization signal, media degradation caused by repeating recording Since the synchronization signal field is prevented from being shortened, the synchronization acquisition is stabilized.
    (Example 2)
    3, an optical disk apparatus according to Embodiment 2 of the present invention for recording and reproducing on an optical disk having a guard data recording field at the head of a sector will be described. The description of the parts already described in the optical disk device of FIG. 18 related to the conventional technology will be omitted.
    Added to the prior art are the guard data generation circuit 200 and the first write control circuit 201. The guard data generation circuit 200 generates specific guard data. First, the guard data of the guard data generating circuit 200 is provided, and then the synchronous signal VFO of the synchronous signal VFO generating circuit 14 is added, followed by the modulated data of the data modulation circuit 13. This data timing is controlled by the first write control circuit 201. The combined guard data, synchronizing signal VFO, and modulated data are provided to the laser drive circuit 12 and recorded on the optical disk.
    According to the present embodiment, as described below, in addition to the configuration of the conventional optical disk apparatus, a guard data generating circuit 200 and a first recording control apparatus 201 for generating guard data are provided, and a header field is provided. By recording the guard data of the guard data recording field 100 between (4) and the synchronization signal field VFO at the beginning of the data recording field 5, the synchronization signal is protected from medium degradation caused by repeating the recording. Thus, an optical disk device that is stable in synchronism acquisition is realized.
    (Example 3)
    In the optical disc having the format structure according to the third embodiment of the present invention, Figs. 4A to 4D and Figs. 5A to 5D are recording mediums of recording start points at the time of repeat recording. The relationship between the deterioration of and the synchronization section of the synchronization signal field VFO is shown. In the optical disc of Embodiment 3, the recording pattern of the guard data in the guard data recording field is the same as the recording pattern of the synchronization signal field VFO. Further, at the boundary between the guard data recording field and the synchronization signal field, the phase of the recording pattern is coincident so as not to cause discontinuation.
    First, in Figs. 4A to 4D, the guard data in the guard data recording field is different from the recording pattern of the synchronization signal field VFO. Fig. 4A shows a data recording field after one repetition, Fig. 4B shows a fixed range during synchronization, and Fig. 4C shows a data recording field after 100,000 repetitions. 4 (d) shows the fixed range during synchronization after 100,000 repetitions.
    In the initial state after one repetition, the guard data recording field 100 at the recording start point of the data recording field 5 is free from medium deterioration. The section of the guard data recording field in the initial state is assumed to be T 1 , and the section of the synchronization signal field VFO is assumed to be T 2 .
    After one repetition, the fixed range of the synchronization 300 becomes the T 2 section of the synchronization signal field VFO.
    In the case after 100,000 repetitions shown in FIG. 4C, the medium deterioration 30 occurs during the TC 2 section at the head of the guard data recording area 100. As a result, the guard data recording field 100 is shortened to a T 5 section. However, only the guard data recording field in which the guard data is recorded is shortened, and the synchronization signal field VFO necessary for synchronization is not affected at all by the medium degradation 30.
    As shown in (d) of FIG. 4, the fixed range at the time of synchronization 300 after 100,000 repetitions remains T 2 as in the initial state after one repetition. Thus, as in the initial state, acquisition of stable synchronization is realized.
    In Figs. 5A to 5D, the guard data of the guard data recording field is the same as the recording pattern of the synchronization signal field VFO. Further, the images of the recording pattern are coincident so as not to be discontinuous at the boundary between the guard data recording field and the synchronization signal field. Fig. 5A shows a data recording field after one repetition, Fig. 5B shows a fixed range during synchronization, and Fig. 5C shows a data recording field after 100,000 repetitions. 5 (d) shows the fixed range at the time of synchronization after 100,000 repetitions.
    As shown in Fig. 5A, in the initial state after one iteration, the guard data recording field 100 at the recording start point of the data recording field 5 is free from medium deterioration. The interval of the guard data recording field in the initial state is assumed to be T 1 , and the interval of the synchronization signal field VFO is assumed to be T 2 .
    Therefore, the fixed range of the synchronization 400 after one repetition is that the signal of the guard data recording field is maintained in the same recording pattern as that of the synchronization signal field VFO, so that the T 1 section and the synchronization signal field of the guard data recording field are maintained. T 1 + T 2, which is the sum of the T 2 intervals of the VFO. Compared to T 2 , which is a fixed range of the synchronization 300 in the recording pattern, the signal of the guard data recording field is different from the synchronization signal field VFO described in FIGS. 4A to 4D and is fixed in this embodiment. The range extends to the T 1 interval portion of the guard data record field.
    In the case after 100,000 repetitions shown in FIG. 5C, the medium deterioration 30 occurs at the head of the guard data recording area 100 during the TC 2 period. Accordingly, the guard data recording field 100 is shortened to the T 5 section. However, since only the guard data recording field in which the guard data is recorded is shortened, the synchronization signal field VFO necessary for synchronization is not affected at all by the medium degradation 30.
    A fixed range of the synchronization (400) after 100,000 iterations shown in (d) in Figure 5, T sum of five sections and the synchronous signal field VFO T 2 period of the guard data recording field (100), T is a 5 + T 2 . Compared to T 2 , which is the fixed range of the synchronization 300 in the recording pattern, the signal of the guard data recording field is different from the synchronization signal field VFO described in FIGS. 4A to 4D, and the fixed range is the guard data. It extends to the section portion of the recording field.
    Therefore, even if medium degradation occurs at the recording start point after 100,000 repetitions, the fixed range of synchronization is longer by the T 5 section portion of the guard data recording field than the T 2 section of the initial synchronization signal field VFO. As a result, the stability and reliability of phase locked loop (PLL) synchronization is improved.
    As will be explained below, according to the present embodiment, the guard data recording field 100 provided between the header field 4 and the data recording field of the optical disc is provided with guard data having the same recording pattern as the synchronization signal field VFO. By doing so, the continuity is maintained, and the fixed range of synchronization can be extended behind the synchronization signal field VFO, so that if media degradation due to repetitive recording occurs, the stability and reliability of synchronization acquisition can still be maintained.
    (Example 4)
    Hereinafter, an optical disk apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. 6, which records and reproduces by providing a recording pattern guard data recording field at the head of a sector, the guard data being a synchronization signal field. Same as in VFO. The description of the parts already described in the optical disk device of FIG. 19 associated with the conventional technology will be omitted.
    Circuits added to the prior art are the VFO guard data generation circuit 500 and the first write control circuit 201. The VFO guard data generation circuit 500 generates the same write pattern as the guard data write field 100 and the sync signal field VFO. The first write control circuit 201 generates continuous gate timing so as not to cause any discontinuity between the guard data write field 100 and the sync signal field 5b. As a result, in the guard data recording field 100 and the synchronization signal field 5b, the same recording pattern for synchronization is generated continuously.
    Modulated data from the data modulation circuit 13 is added to the head of the recording pattern generated by the VFO guard data generation circuit 500. This data timing is controlled by the first write control circuit 201. The combined data is subsequently provided to the laser drive circuit 12 at the stage and recorded on the optical disc.
    According to this embodiment, as will be described below, the VFO guard data generation circuit 500 for generating a common write pattern to the guard data write field 100 and the synchronization signal field VFO and the first write control circuit 201 is provided. By adding to the conventional optical disk device, a recording pattern for synchronization is recorded between the header field 4 and the synchronization signal field VFO, and thus, since the fixed range of synchronization extends to the rear of the interval of the synchronization signal field VFO, An optical disk device that can improve the reliability and stability of synchronizing acquisition can be realized in view of medium degradation caused by repetitive recording.
    (Example 5)
    Fig. 7 is a step by step description of a recording method for an optical disc according to Embodiment 5 of the present invention for recording and reproducing the same recording pattern of the sync signal field VFO in the guard data recording field at the head of a sector.
    In step 210, the optical disk device reads address information of the optical disk by a command from the host system of the address detection circuit 17 (see, for example, FIG. 6). The system control circuit 18 checks whether the address of the sector has been recorded.
    In step 211, the recorded data is encoded by the encoding circuit 15, modulated by the data modulation circuit 13, and the data modulation circuit 13 outputs the modulated data.
    In step 212, a synchronization signal VFO for synchronization is added by the VFO generation circuit 14 to the beginning of the modulated data.
    In step 213, guard data for suppressing medium degradation is added by the guard data generation circuit 20 to the head of the synchronization signal VFO.
    Then, in step 214, the write data generated in steps 211, 212, and 213 are controlled by the first write control circuit 201 and written in the appropriate order in the recorded corresponding sectors. Specifically, the guard data is recorded in the guard data recording field, and the synchronization signal VFO and user data are recorded in the data recording field.
    By these steps, data can be recorded on the optical disc and reproduced from the optical disc in the recording format shown in FIG.
    (Example 6)
    Hereinafter, with reference to Figs. 8A to 8D, the optical disc according to the sixth embodiment of the present invention will be described next, and the recording section of the guard recording field is randomly changed each time it is recorded.
    8A to 8D, various recording sections of the guard data recording field 100 of each sector 1, 2, 3, and 4 are shown.
    In FIG. 8A, the recording section of the guard data recording field 100, which is related to the sector 1, is T 1, and the interval of the subsequent synchronization signal field VFO is T 2 . The combined section of the guard data recording field 100 and the synchronization signal field VFO is T 1 + T 2 .
    In FIG. 8B, the recording section of the guard data recording field 100 in relation to the sector 2 subsequent to the sector 1 is extended by the dT section compared to the sector 1 to be T 1 + dT. The combined section of the guard data recording field 100 and the synchronization signal field VFO is T 1 + T 2 + dT. As the guard data record field 100 extends by dT, it can be understood that the end of the data record field is shifted backwards by the same amount.
    In FIG. 8C, the recording section of the guard data recording field 100 in relation to the sector 3 following the sector 2 extends by 2dT sections compared to the sector 1, resulting in T 1 + 2dT. . Therefore, the coupling period between the guard data recording field 100 and the synchronization signal field VFO is T 1 + T 2 + 2dT. Just as the guard data recording field 100 extends by 2dT, the end of the data recording field is likewise shifted backward by the same amount.
    In FIG. 8D, the recording section of the guard data recording field, which is related to the sector 4 subsequent to the sector 3, is T 1 as in the sector 1 . Therefore, the coupling period between the guard data recording field 100 and the synchronization signal field VFO is again T 1 + T 2 .
    According to this scheme, the recording section of the guard data recording field 100 changes randomly every time recording at a time resolution of dT in all sectors. The number of bits for randomly changing this time resolution dT is appropriately determined by the system configuration. A detailed example of a phase change optical disk will now be described.
    When the channel bit frequency is 29.18 MHz, assuming that one byte of data corresponds to 16 channel bits during the period t = 34.27 nanoseconds (nsec) of one bit of the channel bit, 16t = 548 nanoseconds becomes one byte in the data. . The line velocity is about 6 m / s. The guard data recording field 100 of section T 1 = 20 bytes is changed by eight bytes of 0 to 7 bytes by 20 bytes + K (K = 0 to 7) at a resolution of 1 byte unit. By this random time shift, since the starting point of the synchronization signal field VFO can be changed at random, recording degradation due to the same recording pattern can be prevented. The recording section of the guard data recording field is 20 bytes x 6 m / s x 548 nsec = 66 m.
    Although not shown in Figs. 8A to 8D, a random time shift is also preferably given to the guard data recording field 100, and the recording pattern is the same as that of the synchronization signal field VFO. As a result, the length of the gap field 7 changes randomly every time recording. For example, a gap field interval of 10 bytes (34 μm) is changed in 16 ways corresponding to 0 to 15 channel bits at a resolution of one channel bit t = 34.27 nanoseconds. This is described later in detail.
    When using such a random time shift, according to the relationship between the number of recordings and the deterioration interval of the guard data recording field 100, the deterioration interval is 7 µm at 20,000 recording iterations, 10 µm at 50,000 iterations, and 100,000 33 μm at each repetition.
    As a result of the random time shift, the deterioration of the recording section of the guard data recording field 100 is suppressed to 33 mu m even if the recording is repeated 100,000 times. If the recording section of the guard data recording field 100 is set to 66 µm, even after 100,000 recordings, since the degradation of the recording section does not extend to the synchronization signal field VFO, stable synchronization acquisition is maintained.
    In this regard, since the recording pattern of the guard data recording area is the same as the synchronization signal VFO, the channel bits are repeated as 00010001, and alternating repetition of mark and space in the length of four channel bits in the recording medium can be used.
    (Example 7)
    Hereinafter, an optical disk apparatus according to Embodiment 6 of the present invention will be described with reference to FIG. 9, where recording and reproduction are performed on the optical disk while randomly changing the recording section of the guard data recording field each time recording. The description of the parts already described with respect to the optical disk device of FIG. 19 related to the conventional technology will be omitted.
    Circuits added to the prior art are the guard data generation circuit 200, the first write control circuit 201, and the first random change circuit 220. The guard data generation circuit 200 generates specific guard data. In order to start the guard data from the guard data generating circuit 200, the synchronizing signal VFO from the synchronizing signal VFO generating circuit 14 is added, followed by the modulation data from the data modulation circuit 13. The first random change circuit 220 changes the write section of the guard data recording area by 20 bytes + K (K varies randomly from 0 to 7) at a resolution of 1 byte. While the recording period of the guard data recording field changes randomly, the timing of the combined guard data, the synchronization signal VFO, and the modulated data are controlled by the first write control circuit 12, and these write signals are lasered at a later stage. It is provided to the drive circuit 12, and is written to the sector on the optical disc during random changes every time recording.
    As described below, according to the present embodiment, the guard data generation circuit 200, the first write control circuit 201, and the first random change circuit 220 for generating guard data in the conventional optical disk device are described. By adding, the recording start point changes randomly every time recording, and therefore signal degradation of the synchronization signal VFO and user data due to repetitive recording can be suppressed.
    (Example 8)
    10 records and reproduces by randomly changing the lengths of the first and second gap fields and the first and second guard data recording fields each time the first gap field is smaller than the change amount of the first guard data recording field. The format structure of an optical disk according to Embodiment 8 of the present invention for setting the amount of change of Description will be omitted for the parts already described in the format structure shown in FIG. 18 related to the conventional technology.
    Added to the prior art are the mirror field 270 used to adjust the servo signal, the first gap field 271 which is the period without signal, the first guard data recording field 272 for recording the guard data, and subsequent A second guard data record field 273 for recording guard data in the data record field 5, and a second gap field 274 which is a section in which there is no signal.
    Hereinafter, the recording sections of the first and second gap fields 271 and 274 and the first and second guard data recording fields 272 and 273 change randomly every time they are recorded.
    11 records on the optical disc and reproduces from the optical disc by randomly changing the lengths of the first and second gap fields and the first and second guard data recording fields each time recording is performed. An optical disk apparatus for setting the change amount of the first gap field smaller than the change amount is shown. The same parts that have already been described with respect to the optical disk device of FIG. 19 in relation to the prior art will be omitted.
    Circuits added to the apparatus of the prior art are the guard data generation circuit 200, the second write control circuit 230, the second random change circuit 240, and the polarity conversion circuit 250. The guard data generation circuit 200 generates specific guard data. In order to start the guard data from the guard data generation circuit 200, the synchronization signal VFO from the synchronization signal VFO generation circuit 14 is added, followed by the modulated data from the data modulation circuit 13. The second random change circuit 240 randomly changes the write intervals of the first and second gap fields. For example, the first gap field is changed by 10 bytes + J / 16 (J varies randomly from 0 to 15) each time a write is made. Since the resolution of the change amount is J / 16, one byte consists of 16 bits per channel bit. The second gap field is changed by 25 bytes-J / 16 (J varies randomly from 0 to 15) each time a write is made. Accordingly, the total length of the recording section of the first gap field and the recording section of the second gap field is kept constant. Further, the second random change circuit 240 randomly changes the write intervals of the first and second guard data write fields. For example, the first guard data record field is changed by 20 bytes + K (K varies randomly from 0 to 7), which is a resolution of 1 byte. Similarly, the second guard data record field is changed by 55 bytes-K (K is randomly varied from 0 to 7), which is a resolution of 1 byte. Hereinafter, the total length of the recording section of the first guard data recording field and the recording section of the second guard data recording field is also kept constant.
    While randomly changing the recording intervals of the first and second gap fields and the first and second guard data recording fields, the combined guard data, the synchronization signal VFO, and the modulated data are controlled by the second write control circuit 230. do. The write signal composed of these signals passes through the polarity conversion circuit 250 at a later stage, and the polarity of the write signal is randomly changed in the sector section every time the recording is performed. The write signal from the polarity conversion circuit 250 is provided to the laser drive circuit 12, the write intervals of the first and second gap fields and the write intervals of the first and second guard data write fields are changed randomly, The polarity of the recording signal is changed randomly and recorded in the sector on the optical disk.
    Hereinafter, an example of the structure of the second random change circuit 240 will be described with reference to FIG. 12. In FIG. 12, the random change circuit 701 consists of 13 stages of the shift register 704 and is designed to receive a clock 703 and a random update command 704. By the command of the random update command 704, the single polarity and the amount of change are the one bit signal 705 for determining the polarity of the write signal, and the four bit signal 706 for determining the amount of change in the first and second gap fields. And a 3-bit signal 707 for determining the amount of change in the first and second guard data recording fields.
    Fig. 13 is a flowchart showing an operation for rewriting recording information by this optical disk device.
    In addition, with reference to FIG. 11, the operation | movement according to the flowchart of FIG. 13 is demonstrated below.
    In step 261, the optical disc reads the address information of the optical disc by a command from the host system of the address detection circuit 17. The system control circuit 18 checks whether the address of the sector has been recorded.
    In step 262, the recorded data is encoded in the encoding circuit 15, modulated in the data modulation circuit 13, and the data modulation circuit 13 outputs the modulated data.
    In step 263, a synchronization signal VFO for synchronization is added to the head of the data modulated by the VFO generation circuit 14.
    In step 264, the guard data for suppressing medium degradation is added by the guard data generation circuit 200 to the first guard data record field and the second guard data record field following the user data at the head of the synchronization signal VFO. do.
    In step 265, the write intervals of the first and second gap fields are randomly determined by the amount of change in the 0-15 channel bits, which is the resolution of one channel bit. Similarly, the amount of change in the recording section of the first and second guard data recording fields is randomly determined by the amount of change of 0 to 7 bytes, which is a resolution of 1 byte. In other words, by the extended portion of the first gap field, the length of the second gap field is shortened, and the total length does not change. Similarly, the total length of the first and second guard data record fields does not change.
    In step 266, while randomly changing the recording intervals of the first and second gap fields and the first and second guard data recording fields, the recording signal is divided from the combined guard data, the synchronization signal VFO, and the modulated data. Is generated.
    In step 267, it is determined whether to reverse the polarity of the write signal.
    In step 268, if it is determined in step 267 to change the polarity, the polarity of the write signal is converted.
    In step 269, the write signal determined in steps 263 to 268 is recorded in the corresponding sector recorded.
    According to the above mechanism, signals are recorded on the optical disc in the format as shown in FIG.
    Referring to Figs. 14A to 14D, the random change state of the first and second gap fields and the first and second guard data fields will be described. 14A to 14D show the recording format of a sector by randomly changing the lengths of the first and second gap fields and the first and second guard data recording fields by the above method. The sector of the optical disk includes an address signal 401, a first gap field 402, a first guard data recording field 403, a recording signal 404 consisting of a synchronization signal VFO and user data, and a second guard data recording field ( 405, and a second gap field 406.
    14A illustrates a case where the change amount J of the first gap field 402 is at least J = 0, and the change amount K of the first guard data recording field 403 is at least K = 0. Therefore, the length of the first gap field 402 is the minimum value G1min and the length of the second gap field 406 is the maximum value G2max. The length of the first guard data record field 403 is the minimum value D1min, and the length of the second guard data record field 405 is the maximum value D2max. In the case shown in Fig. 14A, the recording signal 404 is located at the most head position of the sector.
    J = Jmax and K = 0 in FIG. 14B, J = 0 and K = Kmax in FIG. 14C, and J = Jmax and K = Kmax in FIG. 14D. Hereinafter, Jmax is the maximum change amount of the gap field, which is usually 15 channel bits, and Kmax is the maximum change amount of the guard field, which is usually 7 bytes. In the case shown in Fig. 14D, the recording signal 404 is located at the end of the sector. The length of the first gap field 402 is the maximum value G1max and the length of the second gap field 406 is the minimum value G2min. The length of the first guard data recording field 403 is the maximum value D1max and the length of the second guard data recording field 405 is the minimum value D2min.
    15A to 15B are schematic diagrams of sector deterioration. In FIG. 15A, J = 0 and K = 0, and in FIG. 15B, J = Jmax and K = Kmax. As shown in the figure, the deterioration 501 of the tip occurs in the first guard data recording field 403, and the deterioration area 504 of the tip is set to the total length Jmax of the maximum change amount of the first and second gap fields. Is formed. Similarly, the terminal degradation 502 occurs in the second guard data recording field 405, and the terminal degradation region 505 is formed with the total length Jmax of the maximum change amount portions of the first and second gap fields. However, this deterioration area prevents further expansion of the deterioration areas at the front end and the end in the first and second guard data recording fields, so that the deterioration area has a detrimental effect on the recording signal 404 composed of the synchronization signal VFO and the user data. Does not have
    In addition, in the recording signal 404 composed of the synchronization signal VFO and the user data, since the recording section changes randomly and extends to a resolution of 1 byte, the range 506 for inducing local oscillation is expanded. And local degradation 503 is dispersed, so local degradation can be reduced.
    In an actual write operation, J is a channel bit, one byte consists of 16 channel bits, and K is a larger value than J. Thus, while the positions of the first and second gap fields randomly change every minute, the recording position varies more widely in the recording signal 404 surrounded by the first and second guard data recording fields.
    In this embodiment, in order to satisfy the following requirement, J is set in channel bits and K is set in bytes. That is, the random shifts of the first and second gap fields are small in order not to extend the deterioration area at the recording start and end, and the random shifts of the channel bits in the smallest unit for processing the digital data are realized, whereas Deterioration is dispersed by increasing the amount of change in the recording field of the synchronization signal and the user data recording signal, and the information arrangement is simplified.
    The first and second guard data recording fields prevent deterioration phenomena occurring at the leading and terminating ends due to repetitive recording from propagating to recording signals such as synchronization signal VFO and user data. Therefore, from the viewpoint of preventing the expansion of the deterioration area, the random shift will not be increased too much.
    Local degradation in the recording signal such as the synchronization signal VFO and the user data will be preferably distributed by changing the byte area to extend the induction area, thereby reducing the possibility of the result due to the degradation.
    Usually, when processing digital data, it is desirable to process the data in bytes. However, if the random shift is processed only in byte units, deterioration occurs in byte units, and deterioration in byte units easily occurs, so that the deterioration prevention effect of the medium is reduced as compared with random shifts in channel bits. On the other hand, if the random shift is always processed in units of channel bits where only a partial shift of 5 bits or 9 bits occurs, signal processing at the time of reproduction is difficult.
    In this embodiment, accordingly, since the random shifts of the first and second gap fields in the period without a signal are in the unit of channel bits, deterioration in byte units can be prevented, and deterioration in byte units can be prevented. And deterioration at the beginning and end of the sector can be effectively suppressed. In the recording signal of the synchronization signal VFO and the user data, if the random shift is processed in units of bytes, the recorded area can be expanded so that degradation in units of marks can be dispersed, and reproduced data can be processed in units of bytes. Therefore, there is no inconvenience when processing signals during reproduction.
    As a result, the recording position of the synchronizing signal VFO or the recording signal 404 of the user data as known from all sectors is recorded in two stages of random shift (i.e., large random shift and small random shift) every time recording. Is changed over time. In this embodiment, for two types of degradations, namely, degradation and local degradation at the start and end of a sector occur per mark, and these degradations can be effectively reduced in recording and reproducing information.
    Further, according to this embodiment, the polarity of the recording signal is randomly inverted every time recording. 16A to 16C show the relationship between the polarity of the recording signal and the actual recording state on the optical disk. The sector of the optical disk includes an address signal 604, a first gap field 605, a first guard data recording field 601, a recording signal 607 consisting of a synchronization signal VFO and user data, and a second guard data recording field ( 608, and a second gap field 609 is formed.
    If the polarity is not reversed, the recording signal 601 is recorded on the recording medium in state 602, and if the polarity is reversed, it is recorded on the recording medium in state 603. FIG. That is, by inverting the polarity, since the undissolved portion and the dissolved portion of the foil forming the mark are completely reversed, the effect of preventing deterioration can be obtained.
    17 is a diagram showing the results of confirming the result of the random shift of the present invention in the Examples. In this embodiment, the jitter value after repeatedly recording the same data signal in the sector of the optical disc is shown. After 100,000 recording repetitions, based on guidelines of error rate less than once per 10,000 times during demodulation, jitter values of 15% or less are regarded as a reference for data reproduction.
    In curve 50, the maximum change amount of the first gap field is Jmax = 15 channel bits, the maximum change amount of the first guard data recording field is Kmax = 7 bytes, and in curve 51, the maximum change amount of the first gap field. Is Jmax = 15 channel bits, the maximum change amount of the first guard data recording field is Kmax = 7 bytes, and polarity inversion is included.
    As can be seen from curves 50 and 51, the desired conditions include the maximum amount of change in the first gap field of Jmax = 15 channel bits, the maximum amount of change in the first guard data record field of Kmax = 7 bytes, and the polarity conversion. Can be satisfied. From the viewpoint of the disk capacity, it is desired that the amount of change in the first gap field and the first guard data recording field is as small as possible, so that the maximum amount of change in the first gap field of Jmax = 15 channel bits, the first guard of Kmax = 7 bytes. It is determined that the combination of the maximum amount of change in the data recording field and the polarity inversion are preferable.
    In the stage of the present embodiment, the random shift is also Jmax = 15 channel bits and Kmax = 7 bytes, but later demodulates 100,000 times with a small shift width in accordance with advances in technology such as the development of high performance recording thin film materials. We can get error rate less than once per 10,000 times. In this case, furthermore, according to the present invention, as in the present embodiment, it is possible to suppress the deterioration phenomenon for recording accurate information and reproducing the information with a predetermined limited random shift amount.
    Therefore, according to this embodiment, with the maximum amount of change of the first gap field of Jmax = 15 channel bits, the maximum amount of change of the first guard data recording field of Kmax = 7 bytes, the first gap field and the first guard each time a write is made. By randomly changing the length of the field and changing the polarity of the recording signal every time recording, the signal processing is easily carried out with a limited amount of random shift, and when the information is correctly recorded and the information is reproduced, it is required to be used in every sector and every mark. Branches of deterioration can be suppressed.
    In this embodiment, by setting the recording pattern of the guard data of the first guard data recording field to the same recording pattern of the synchronization signal field, and continuously holding the image of the recording signal between the first guard data recording field and the synchronization signal section In addition, the synchronization signal interval can be extended and system stability can be improved.
    In addition, with at least one type of recorded optical output in an optical disk apparatus utilizing a reproduced optical output, the present invention can be clearly applied to not only phase change optical disks but also magneto-optical disks and the like.
    权利要求:
    Claims (36)
    [1" claim-type="Currently amended] In an optical disc,
    A plurality of sectors are provided on the track of the optical disc, each sector including (i) a header field containing a sector identification signal and (ii) a data recording field comprising a sync signal field,
    Wherein each sector is provided between the header field and the data recording field, and includes a guard data recording field for recording guard data.
    [2" claim-type="Currently amended] The method of claim 1,
    And the synchronization signal field includes a synchronization signal for synchronizing the start of the data recording field and user data provided adjacent to the synchronization signal.
    [3" claim-type="Currently amended] The method of claim 1,
    And the guard data of the guard data recording field is the same as the recording pattern of the synchronization signal.
    [4" claim-type="Currently amended] The method of claim 3, wherein
    And the phase of the recording pattern is continuous adjacent to a boundary between the guard data recording field and the synchronization signal field.
    [5" claim-type="Currently amended] The method of claim 1,
    The recording section of the guard data recording field is randomly changeable each time recording.
    [6" claim-type="Currently amended] The method of claim 5,
    The recording section of the guard data recording field is changeable in an amount of 7 bytes or less each time, and can be changed randomly in units of 1 byte.
    [7" claim-type="Currently amended] The method of claim 6,
    Wherein the period of the one byte is 548 nanoseconds (ns), and the frequency of the channel bit for forming one byte into 16 channel bits is 29.18 MHz.
    [8" claim-type="Currently amended] An optical disc having a plurality of sectors and having a header field including a sector identification signal and a data recording field including a synchronization signal and user data in each of the sectors,
    Each sector of the sector does not have an interval gap field having no first signal, a first guard data recording field for recording guard data, the data recording field, a second guard data recording field, and a second signal. An interval gap field, the total length of the first and second gap fields is constant, the total length of the first and second guard data recording fields is constant, the first gap field and the first guard data The length of the recording field is randomly recordable each time recording, and the amount of change in the first gap field is smaller than the amount of change in the first guard data record field.
    [9" claim-type="Currently amended] The method of claim 8,
    And the resolution of the change amount of the first gap field is in channel bits and the resolution of the change amount in the first guard data recording field is in bytes.
    [10" claim-type="Currently amended] The method of claim 8,
    The polarity of the guard data and the signal of the data recording field can be changed randomly every time recording.
    [11" claim-type="Currently amended] The method of claim 9,
    The resolution of the change amount of the first gap field is 15 channel bits or less, and the resolution of the change amount of the first guard data recording field is 7 bytes or less.
    [12" claim-type="Currently amended] The method of claim 8,
    And the guard data of the first and second guard data recording fields is the same as the recording pattern of the synchronization signal.
    [13" claim-type="Currently amended] An optical disk apparatus for operating an optical disk having a plurality of sectors divided into tracks,
    Each sector has a header field containing a sector identification signal and a data recording field comprising a synchronization signal field,
    The optical disk device,
    Guard data generating means for generating guard data,
    First recording control means for recording guard data of a guard data recording field provided between the header field and the data recording field
    Optical disk device comprising a.
    [14" claim-type="Currently amended] The method of claim 13,
    And the synchronization signal field includes a synchronization signal for synchronizing the start of the data recording field and user data provided adjacent to the synchronization signal.
    [15" claim-type="Currently amended] The method of claim 13,
    And the guard data of the guard data recording field is the same as the recording pattern of the synchronization signal.
    [16" claim-type="Currently amended] The method of claim 15,
    And the phase of the recording pattern is continuously adjacent to a boundary between the guard data recording field and the synchronization signal field.
    [17" claim-type="Currently amended] The method of claim 13,
    And first random changing means for randomly changing a recording section of the guard data recording field.
    [18" claim-type="Currently amended] The method of claim 17,
    The random changing means changes the amount of change of 7 bytes or less in the guard data recording field each time recording is performed with a resolution of 1 byte.
    [19" claim-type="Currently amended] The method of claim 18,
    Wherein the period of the one byte is 548 nanoseconds, and the frequency of the channel bit for forming one byte into 16 channel bits is 29.18 MHz.
    [20" claim-type="Currently amended] An optical disk apparatus for operating an optical disk having a plurality of sectors divided into tracks,
    Each sector has a header field containing a sector identification signal and a data recording field containing a synchronization signal and user data,
    The optical disk device,
    Guard data generating means for generating guard data in the first and second guard data recording fields;
    (Iii) the total length of the first and second gap fields is constant, randomly varying the length of the first and second gap fields, and (ii) the total length of the first and second guard data recording fields is constant. Random changing means for changing the length of the first and second guard data recording fields;
    Recording control for recording signals in the first and second guard data recording fields and the data recording field based on the change amounts of the first and second gap fields and the change amounts of the first and second guard data recording fields; Way
    Optical disk device comprising a.
    [21" claim-type="Currently amended] The method of claim 20,
    The resolution of the variation amount of the first and second gap fields is in channel bits, and the resolution of the variation amount of the first and second guard data recording fields is in bytes.
    [22" claim-type="Currently amended] The method of claim 20,
    And polarity changing means for randomly changing the guard data of the data recording field and the polarity of the signal each time it is recorded.
    [23" claim-type="Currently amended] The method of claim 21,
    And the random changing means changes the first gap field by an amount of 15 channel bits or less and changes the first guard data recording field by an amount of 7 bytes or less each time recording.
    [24" claim-type="Currently amended] The method of claim 20,
    And the guard data of the first and second guard data recording fields is the same as the recording pattern of the synchronization signal.
    [25" claim-type="Currently amended] In the optical disc recording method,
    Providing each optical disc having a plurality of sectors having a header field containing a sector identification signal and a data recording field comprising a synchronization signal field, each sector divided into tracks;
    Recording guard data in a guard data recording field provided between the header field and the data recording field;
    Optical disc recording method comprising a.
    [26" claim-type="Currently amended] The method of claim 25,
    Providing a synchronization signal for synchronizing the beginning of the data recording field to the synchronization signal field, and providing user data adjacent to the synchronization signal.
    [27" claim-type="Currently amended] The method of claim 26,
    And providing guard data of the same guard data recording field as the recording pattern of the synchronization signal.
    [28" claim-type="Currently amended] The method of claim 27,
    And setting an image of a recording pattern continuously adjacent to a boundary between the guard data recording field and the synchronization signal field.
    [29" claim-type="Currently amended] The method of claim 25,
    And randomly changing each time a recording section of the guard data recording field is recorded.
    [30" claim-type="Currently amended] The method of claim 29,
    And setting a change amount of the recording section of the guard data recording field to 7 bytes or less, and randomly changing each time the change amount is recorded in units of 1 byte.
    [31" claim-type="Currently amended] The method of claim 30,
    And setting the frequency of the channel bits for configuring the one byte period to 548 nanoseconds and the one byte to 16 channel bits to 29.18 MHz.
    [32" claim-type="Currently amended] An optical disc recording method having a plurality of sectors each divided into tracks and each having a header field including a sector identification signal and a data recording field including a synchronization signal field, comprising:
    The optical disc recording method,
    A sector consisting of an interval gap field in which a first signal is not recorded, a first guard data recording field for recording guard data, the data recording field, a second guard data recording field, and an interval gap field in which a second signal is not recorded. Sequentially forming the structure,
    Setting the total length of the first and second gap fields constant, setting the total length of the first and second guard data recording fields constant, and setting the total length of the first gap field and the first guard data recording field. Randomly varying each time the length is recorded,
    Controlling the amount of change in the first gap field to be smaller than the amount of change in the first guard data recording field
    Optical disc recording method comprising a.
    [33" claim-type="Currently amended] The method of claim 32,
    And setting the change amount of the first gap field in the unit of resolution of channel bits, and setting the change amount of the first guard data record field in the unit of resolution of bytes.
    [34" claim-type="Currently amended] The method of claim 32,
    And randomly changing each time recording the guard data of the data recording field and the polarity of the signal.
    [35" claim-type="Currently amended] The method of claim 33, wherein
    And setting the amount of change in the first gap field to 15 channel bits or less, and the amount of change in the first guard data record field to 7 bytes or less.
    [36" claim-type="Currently amended] The method of claim 32,
    And setting guard data of the first and second guard data recording fields in the same manner as the recording pattern of the synchronization signal.
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    同族专利:
    公开号 | 公开日
    KR100491233B1|2005-05-25|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-10-07|Priority to JP96-265876
    1996-10-07|Priority to JP26587696
    1996-10-11|Priority to JP96-269580
    1997-10-06|Application filed by 마츠시타 덴끼 산교 가부시키가이샤
    2000-07-25|Publication of KR20000048935A
    2005-05-25|Application granted
    2005-05-25|Publication of KR100491233B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP96-265876|1996-10-07|
    JP26587696|1996-10-07|
    JP96-269580|1996-10-11|
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