JP2009076198A - Information recording medium, information recording medium recording method, information recording medium reproducing method, information recording medium recording/reproducing device, information recording medium original disk manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium in which a content of a DVD video inhibited in copying can not be copied, but a content of a DVD video not inhibited in copying or a content of self-recorded video can be copied at least once. <P>SOLUTION: In the information recording medium recording and playing back information making an error correction block as a unit of recording/reproducing, a recording region which is constituted making the error correction block recording the information as a unit of recording/reproducing and which has first depth, and a pre-pit region in which a pre-pit region in which the error correction block can be played back as a unit of recording/reproducing is formed and which has second depth have a boundary being different from a unit of the error correction block between the recording regions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information recording medium and a method for reproducing information recording medium, which are high-density recording type discs in which information prohibited from copying cannot be copied but information not prohibited from copying can be copied at least once About.

  In general, in DVD-RW (Reritable) and other high-density recordable discs that can be recorded multiple times with compatibility with DVD-Video, content protected by copyright and content that is not so are identified, so You must ensure that illegal copying is not done. A DVD video is a reproduction-only disc, and copyright information for prohibiting copying of content is recorded in a predetermined region (CSS region) of the disc by CSS (content scramble system) (recording a CSS key). A system for preventing illegal copying is adopted in which the DVD video playback apparatus reads out the CSS key and plays back the content using the CSS key.

  On the other hand, when a high-density disc on which a DVD video content is recorded together with a CSS key by a high-density disc recording device is reproduced by a DVD video reproducing device, the CSS key can be read out. Can be played. As a result, a situation occurs in which the copyright of the copy-prohibited DVD video cannot be protected.

By the way, although it is not a high-density disc that can be recorded a plurality of times, a DVD video CSS key is recorded in a normal state on a disc that can be recorded only once, such as DVD-R (Rewritable). A special code other than the CSS key is recorded in a predetermined area (CSS area) of the disk at the time of shipment so that the CSS key cannot be overwritten later. As a result, when a DVD-R on which a DVD-Video content is not recorded together with a CSS key on a high-density disc recording device is reproduced on a DVD-Video playback device, the CSS key cannot be read, so that the DVD-Video content is Cannot play. As a result, copyright protection of copy-prohibited DVD video can be achieved.
JP-A-7-182766 JP-A-11-176089

  As described above, since the DVD-R can be recorded only once, if the CSS key is not readable, it is possible to protect the copyright of copy-prohibited DVD video content. On the other hand, in the high-density type disc that can be recorded a plurality of times as described above, even if special data (a special code other than the CSS key) is recorded in the CSS area like DVD-RW, If a regular CSS key (a copy-permitted CSS key) is overwritten, the DVD-Video content whose copy is prohibited can be easily reproduced and illegally copied. As a result, in a high-density disc that can be recorded a plurality of times, a situation occurs in which the copyright protection of copy-prohibited DVD video content cannot be performed. In addition, a high-density disc that can be recorded a plurality of times is required to be able to reproduce and copy DVD video content that is not prohibited from copying or self-recorded video content.

Accordingly, the present invention has been made to solve the above-described problem, and in an information recording medium for recording and reproducing information using an error correction block as a unit of recording and reproduction,
The error correction block for recording / reproducing the error correction block is sandwiched between the recording area having the first depth configured with the error correction block for recording the information as a unit of recording / reproduction and the recording area for recording the information. A prepit area having a second depth in which a reproducible prepit is formed as a unit includes a prepit area configured to have a boundary different from the error correction block unit between the recording area and the recording area. It is an object of the present invention to provide an information recording medium and an information recording medium reproduction method characterized by the above. As a result, even if the DVD video content for which copying is prohibited is illegally copied, the copyright information relating to the content cannot be recorded, so that the content cannot be reproduced and cannot be copied. As a result, it is possible to reliably protect the copyright of this content. Further, since content of a DVD video that is not prohibited from being copied, for example, a DVD video that is not prohibited from being copied or a self-recorded video content can be recorded together with copyright information relating to this content, this content can be reproduced, and at least one copy of the content can be reproduced. It becomes possible.

In order to solve the above-described problems, the present invention provides an information recording medium, an information recording medium recording method, an information recording medium reproducing method, an information recording medium recording / reproducing apparatus, and information having the following configurations (1) to (12): A method for manufacturing a recording medium master is provided.
(1) As shown in FIGS. 1 and 7C, the first information (DVD video content for which copying is prohibited) cannot be copied, but the second information (for which copying is prohibited). Non-DVD video or self-recorded video content) is an information recording medium (optical disc) D that can be copied at least once,
A recording region R that records the first and second information, respectively, and has a first depth d1,
Copyright information indicating copy prohibition for the first information and copying allowed for the second information at least once (for example, unlimited copying, copying allowed, copying allowed twice) And a pre-pit region PR in which pre-pits having a second depth d2 deeper than the first depth d1 are formed (in the CSS region pr). A characteristic information recording medium.
(2) The information recording medium according to claim 1, wherein the recording area R is a phase change recording area, and the copyright information recorded in the prepit area PR is reproducible.
(3) An information recording medium recording method for recording the second information on the information recording medium D according to claim 1 or 2,
Based on the recording information composed of the copyright information and the second information recorded in the pre-pit region PR, error correction block information is sequentially generated in a predetermined error correction unit,
An information recording medium recording method, wherein a series of the error correction block information is sequentially recorded in the recording area R.
(4) An information recording medium reproduction method for reproducing the second information recorded on the information recording medium D according to claim 1 or 2,
Reproducing the copyright information from the pre-pit area PR,
Reproducing the error correction block information from the recording area R;
A method for reproducing an information recording medium, wherein the second information is reproduced by performing error correction on the error correction block information in a predetermined error correction unit.
(5) As shown in FIG. 8, an information recording medium recording / reproducing apparatus for recording / reproducing the second information on the information recording medium D according to claim 1 or 2,
Management means (system controller) 9 for managing the sector address of the recording area R and the recording timing for recording in the recording area R based on the sector address read from the information recording medium D;
Storage means (memory) 14 for storing the sector address of the pre-pit area PR and the copyright information;
Information generation means (signal processing unit) 5 for sequentially generating error correction block information in a predetermined error correction unit based on the recording information composed of the copyright information and the second information;
A recording means (optical head) 3 for recording a series of the error correction block information in the recording area at the recording timing;
Based on the copyright information reproduced from the pre-pit area PR, the error correction block information recorded in the recording area R is sequentially read out and error-corrected in a predetermined error correction unit. An information recording medium recording / reproducing apparatus comprising a reproducing means (AV encoding / decoding unit) 6 for reproducing information.
(6) As shown in FIGS. 1 and 7C, the first information (DVD video content for which copying is prohibited) cannot be copied, but the second information (for which copying is prohibited). Non-DVD video or self-recorded video content) is an information recording medium (optical disc) D that can be copied at least once,
A first recording area R for recording the second information using a first recording technique in units of predetermined error correction blocks;
If the error correction capability of the predetermined error correction block unit is n bytes as an information amount, the first information is prohibited from being copied and the second information is allowed to be copied at least once. A second recording area (pre-pit area) PR for recording copyright information as information having an information amount of n bytes or more in the predetermined error correction block unit by using the second recording method; A characteristic information recording medium.
(7) The information recording medium according to claim 6, wherein the first recording method is phase change recording, and the second recording method is prepit recording.
(8) An information recording medium recording method for recording the second information on the information recording medium D according to claim 6 or 7,
A series of error correction block information is generated in a predetermined error correction unit based on the recording information composed of the copyright information and the second information recorded in the second recording area (pre-pit area) PR. ,
An information recording medium recording method comprising: sequentially recording a series of the error correction block information in the first recording area.
(9) An information recording medium reproducing method for reproducing the second information recorded on the information recording medium D according to claim 6 or 7,
Reproducing the copyright information from the second recording area;
Reproducing the error correction block information from the first recording area R;
A method for reproducing an information recording medium, wherein the second information is reproduced by performing error correction on the error correction block information in a predetermined error correction unit.
(10) An information recording medium recording / reproducing apparatus for recording / reproducing the second information on an information recording medium D according to claim 6 or 7, as shown in FIG.
Management means (system controller) 9 for managing the sector address of the first recording area R and the recording timing to be recorded in the first recording area R based on the sector address read from the information recording medium D;
Storage means (memory) 14 for storing a sector address of the second recording area (pre-pit area) PR and the copyright information;
Information generation means (signal processing unit) 5 for sequentially generating error correction block information in a predetermined error correction unit based on the recording information composed of the copyright information and the second information;
A recording means (optical head) 3 for recording a series of the error correction block information in the first recording area R at the recording timing;
Based on the copyright information reproduced from the second recording area (pre-pit area) PR, the error correction block information recorded in the first recording area R is sequentially read out in predetermined error correction units. An information recording medium recording / reproducing apparatus comprising a reproducing means (AV encoding / decoding unit) 6 for reproducing the second information by correcting an error.
(11) An information recording medium master manufacturing method for manufacturing a master of the information recording medium D according to claim 1 or 2, as shown in FIGS.
On the glass substrate 1A, a first photosensitive film (second resist layer) 1B, an intermediate layer 1C, and a second photosensitive film (first resist layer) 1D are sequentially laminated, and the intermediate layer 1C The total thickness of the second photosensitive film 1D and the thickness of the second photosensitive film 1D is the same as the first depth d1 of the recording area R of the information recording medium D, and the first photosensitive film. The total thickness of the photosensitive film 1B and the intermediate layer 1C and the thickness of the second photosensitive film 1D is the same as the second depth d2 of the prepit region PR of the information recording medium D. Laminate as there is
By irradiating an exposure laser with a first light intensity from above the second photosensitive film 1D, the second photosensitive film 1D and the intermediate layer 1C are exposed to expose the glass substrate. On 1A, the recording region R is formed with a first depth d1,
By irradiating the exposure laser from above the second photosensitive film 1D with a second light intensity higher than the first light intensity, the second photosensitive film 1D and the intermediate layer 1C and the first photosensitive film 1B are all exposed to form the pre-pit region PR at a second depth d2 on the glass substrate 1A.
(12) An information recording medium master manufacturing method for manufacturing a master of the information recording medium D according to claim 6 or 7, as shown in FIGS.
On the glass substrate 1A, a first photosensitive film (second resist layer) 1B, an intermediate layer 1C, and a second photosensitive film (first resist layer) 1D are sequentially laminated, and the intermediate layer 1C The total thickness of the second photosensitive film 1D and the thickness of the second photosensitive film 1D is the same as the depth of the first recording region R of the information recording medium D, and the first photosensitive film 1B, the thickness of the intermediate layer 1C, and the thickness of the second photosensitive film 1D are the depth d2 of the second recording region (prepit region) PR of the information recording medium D. Laminate to be the same,
By irradiating an exposure laser with a first light intensity from above the second photosensitive film 1D, the second photosensitive film 1D and the intermediate layer 1C are exposed to expose the glass substrate. Forming the first recording region R on 1A;
By irradiating the exposure laser from above the second photosensitive film 1D with a second light intensity higher than the first light intensity, the second photosensitive film 1D and the intermediate layer 1C and the first photosensitive film 1B are all exposed to form the second recording region PR on the glass substrate 1A.
Further, the present invention may be the following (A) to (Q).
(A) A recording medium which can be recorded a plurality of times in a groove area having a substantially first groove depth, has an address for recording in a predetermined unit, and records in a part of the address area of the medium. A recording / reproducing medium, wherein a recording area relating to information copy prevention is formed substantially as a groove area having a second groove depth, and a predetermined pre-pit having a readable size is formed in this area.
(B) An area relating to copy protection of a part of the address area of the medium having an address for recording in a predetermined unit on a recording medium that can be recorded a plurality of times in the groove area having a substantially first groove depth. Is formed as a groove region of substantially the second groove depth, and is recorded on a recording / reproducing medium in which a predetermined pre-pit is formed in this region, and a correction block is generated in a predetermined correction unit, The recording of the data area related to copy prevention assumes the data embedded in the pre-pit, generates the correction block based on this data, and records the data of the correction block in the correction block area other than the pre-pit at the time of recording. The recording method in the recording / reproducing apparatus characterized by recording.
(C) An area related to copy protection of a part of the address area of the medium having an address for recording in a predetermined unit on a recording medium that can be recorded a plurality of times in the groove area having a substantially first groove depth. Is formed as a groove region substantially having a second groove depth, and a recording / reproducing medium in which predetermined pre-pits are formed in this region,
(D) Address reading means for reading an address from the medium;
Recording information generating means for generating a correction block in a predetermined correction unit;
Recording means for recording information on a medium;
Recording management means for managing the recording position and recording timing by the read address;
Prepit storage means for storing the address position and data of the prepit area;
Block generation means for generating the correction block of this area based on the stored value of the pre-pit storage means;
Recording comprising recording data for recording the data of the correction block on the basis of the timing signal in a correction block area other than the pre-pits in the data generated by the block generation means at the time of recording Playback device.
(E) A recording medium that can be recorded a plurality of times by the first forming method in a recording area in which a predetermined address signal is embedded in a predetermined correction block unit, and the correction capability in a predetermined correction block unit is n Assuming that a byte is used, an information amount of n bytes or more in a predetermined correction block unit is recorded in a predetermined address area as recording information related to copy prevention of recording information by the second forming method. A recording / reproducing medium characterized in that a predetermined correction block unit is used.
(F) A method of recording on a recording medium in which a predetermined address signal is embedded in a predetermined correction block unit and recording on a recording medium that can be recorded a plurality of times by the first forming method, and having a correction capability in a predetermined correction block unit Assuming that the amount of information is n bytes, an information amount of n bytes or more in a predetermined correction block unit is recorded in a predetermined address area as recording information related to copy prevention of recorded information by the second forming method. A step of reading record information relating to copy prevention stored on a medium other than the medium, and generating the correction block based on this information and information other than this information, and in the correction block area other than the information at the time of recording, the correction A recording method in a recording / reproducing apparatus, wherein data of a block is recorded.
(G) a recording medium capable of recording a plurality of times by the first forming method in a recording area in which a predetermined address signal is embedded in a predetermined correction block unit;
Assuming that the correction capability in a predetermined correction block unit is n bytes as the information amount, the information amount of n bytes or more in the predetermined correction block unit is recorded in the predetermined address area as recording information related to copy prevention of recording information by the second forming method. The recorded recording medium,
Address reading means for reading an address from the medium;
Recording information generating means for generating a correction block in a predetermined correction unit;
Recording means for recording information on a medium;
Recording management means for managing the recording position and recording timing by the read address;
A recording area storage means for storing an address position and data of the recording area relating to the copy prevention;
Correction block generation means for generating the correction block of this area based on the stored value of the recording area storage means and information other than the information;
It has recording means for recording the data of the correction block on the basis of the timing signal in a correction block area other than the recording area in the data generated by the block generation means at the time of recording. Recording / playback device.
(H) The medium according to (A) above, wherein the recording medium is phase change recording and the information in the prepit area can be reproduced.
(I) The recording method according to (B) above, wherein the recording medium is phase change recording and the information in the prepit area can be reproduced.
(J) The recording apparatus according to (C) above, wherein the recording medium is phase change recording and the information in the prepit area can be reproduced.
(K) The medium according to (D) above, wherein the first forming method is phase change recording, and the second forming method is pre-pits.
(L) The recording method according to (E), wherein the first forming method is phase change recording and the second forming method is pre-pits.
(M) The recording apparatus according to (F), wherein the first forming method is phase change recording, and the second forming method is pre-pits.
(N) a first photosensitive film for forming a groove region having a substantially first groove depth that can be recorded a plurality of times, and a substance for forming a pre-pit for copy prevention having a readable size. A second photosensitive film formed as a groove region having a second groove depth, an intermediate layer for separating the two films, and the two photosensitive films from two strength levels. The original recording method of the recording / reproducing medium characterized by recording with the light which becomes.
(O) a first photosensitive film for forming a phase change recording in a recording area in which a predetermined address signal is embedded in order to perform recording / reproduction in a predetermined correction block unit, and correction in a predetermined correction block unit When the capacity is n bytes as an information amount, a second photosensitive film that forms recording information related to copy information recording prevention by using an information amount of n bytes or more in a predetermined correction block unit as a pre-pit in a predetermined address area; An original recording method for a recording / reproducing medium, characterized in that an intermediate layer for separating the two films and the two photosensitive films are recorded with light having two intensity levels.
(P) A method of reproducing a recording medium that can be recorded a plurality of times in a groove area substantially having a first groove depth, wherein the area related to copy protection of a part of the address area of the medium is substantially A first reproduction stage for reproducing a recording area formed as a groove area having a second groove depth and having a predetermined pre-pit formed in the groove area; and a second reproduction stage for reproducing the groove area having the first groove depth. And a reproduction method in the recording / reproducing apparatus, wherein the reproduction signals at the first and second reproduction stages are corrected as a predetermined correction unit.
(Q) A method of reproducing a recording medium that can be recorded a plurality of times in the groove area by substantially the first forming method, and assuming that the correction capability of a predetermined correction block unit is n bytes as an information amount, A first reproduction step of reproducing a recording area having an information amount of n bytes or more in a predetermined correction block unit substantially by the second formation method with respect to the copy protection area of a part of the address area; A reproducing method in a recording / reproducing apparatus, characterized in that a second reproduction stage for reproducing a groove area of the method, and reproduction signals in the first and second reproduction stages are corrected as a predetermined correction unit.

  As described above, according to the present invention, in an information recording medium for recording / reproducing information using an error correction block as a recording / reproduction unit, the error correction block for recording the information is configured as a recording / reproduction unit. A recording area having a depth and a prepit area having a second depth formed between the recording area for recording the information and a prepit that can be reproduced by using an error correction block as a recording / reproducing unit; By providing a pre-pit area configured with a boundary different from the unit of error correction block between the recording area, information can be reproduced even if information is recorded using the error correction block as a unit of recording / reproduction. Since it is impossible, copyright protection of this information can be surely achieved.

  Hereinafter, an information recording medium and an information recording medium reproduction method of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged sectional view for explaining an embodiment of the information recording medium of the present invention, FIG. 2 is a diagram for explaining that data to be recorded on the information recording medium of the present invention is made into an ECC block, and FIG. FIG. 4 is a diagram for describing recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in units of sectors, and FIG. 4 is a diagram of a DVD-RW that is an embodiment of the information recording medium of the present invention. FIG. 5 is a diagram showing a physical format of one sector, FIG. 5 is a diagram for explaining a laminated state of a glass master used in an information recording medium master manufacturing method related to the present invention, and FIG. 6 is a resist layer stacked on the glass master. FIG. 7 is a diagram for explaining the steps of the information recording medium master manufacturing method related to the present invention, and FIG. 8 is a block for explaining the information recording medium recording / reproducing apparatus related to the present invention. 9 is a diagram for explaining the relationship between the data and the ECC block recorded in a predetermined area of the information recording medium of the present invention. In the following description, as an embodiment of the information recording medium of the present invention, DVD-RW is used and information is recorded on this DVD-RW. However, other recordable CD-RWs are described. Needless to say, the present invention can also be applied to high-density optical discs such as DVD + RW and next-generation DVD.

  First, before describing the embodiment of the present invention, the point that copy guard data (copy-inhibited CSS key = CSS data) is recorded on a disk and can be read stably will be described. This point is obtained by satisfying all of the following 1) to 4). That is, 1) The CSS data is recorded so that it cannot be erased. 2) Set the amount of data to a predetermined amount or more so that the CSS data cannot be altered by correction. 3) Configure to be able to read CSS data. 4) When recording, exclude CSS data. By satisfying all of the above 1) to 4), the DVD-RW player makes the DVD video content that is copy-guarded (copy prohibited) illegally copyable, while being copy-free (copy prohibited) In the case of DVD video or self-recorded video content, the copyright protection of copy-protected DVD video content can be promoted by enabling copying at least once.

In other words, the above-described matters will be described in detail, and it can be said that the present invention successfully solves the following problems (1) to (3).
(1) DVD video is a read-only disc, and CSS data and recorded content are all composed of pits, and the pit depth is about λ / 4 for a 650 nm laser. On the other hand, a DVD-RW is a phase change recording / reproducing disc, and the recorded or recorded content is recorded in the groove area. In order to optimize the recording / reproducing characteristics, the groove area is compared with the land area. Is approximately λ / 16. Therefore, when recording CSS data in a DVD video on a DVD-RW, the CSS data is not composed of pre-pits having a DVD-RW depth of about λ / 16, but a depth of about λ / 4 to λ / 8. Consists of pre-pits. As a result, the DVD video player can satisfactorily reproduce CSS data having a deep prepit of about λ / 4 to λ / 8 in the DVD-RW.

  (2) Further, even if the DVD video player can successfully reproduce CSS data of a deep prepit of about λ / 4 to λ / 8 in the DVD-RW, the CSS data is recorded in the CSS data recording area (prepit area). If the amount of data is small within the correction capability range of the ECC block including (), error correction is performed during reproduction. Therefore, the present invention sets the data amount of CSS data configured by pre-pits to a predetermined amount or more that exceeds the range of error correction capability, and if the CSS data cannot be read, the content cannot be played back. To prevent illegal copying.

  (3) Next, during recording, the CSS data recorded in the pre-pit area is held in a memory such as a ROM on the recording / reproducing apparatus side, or obtained as an input signal from the outside, and the CSS data that has been pre-pitted And content data constitute ECC block data, and this data is recorded in a recording area other than the pre-pit area, so that the ECC block can be reproduced as data including CSS data during reproduction.

Now, embodiments of the present invention will be described in the following order.
A. "Embodiment of recording format"
B. "Disk Embodiment"
C. "Configuration of information recording and playback device"

A. "Embodiment of recording format"
First, “an embodiment of a recording format” will be described. First, a general physical format when recording information is recorded on a DVD-RW and an error correction process for the recording information will be described with reference to FIGS.

  First, an error correction process in the DVD-RW of the present embodiment and an ECC block as an error correction unit in the error correction process will be described with reference to FIG.

  In general, the recording information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. In one data sector 20, from the head, ID information 21 indicating the start position of the data sector 20, an ID information error correction code (IED) 22 for correcting an error of the ID information 21, It is composed of preliminary data (for example, CPM) 23, a data area 24 for storing main data to be recorded, and an error detection code (EDC) 25 for detecting an error in the data area 24. Recording information to be recorded is constituted by being continuous.

  Next, processing when an ECC block is configured using the data sector 20 will be described with reference to FIG. When an ECC block is configured using the data sector 20, as shown in FIG. 2B, first, one data sector 20 is divided horizontally by 172 bytes, and each divided data (this) Are hereinafter referred to as data blocks 33) in the vertical direction. At this time, 12 rows of data blocks 33 are arranged in the vertical direction.

  Then, a 10-byte ECC code (PI (Pality In) code) 31 is added to the end of the data block 33 for each horizontal data block 33 arranged in the vertical direction to form one correction block 34. To do. At this stage, the correction blocks 34 to which the ECC code 31 is added are arranged in 12 rows in the vertical direction. Thereafter, this process is repeated for 16 data sectors 20 minutes. As a result, a correction block 34 of 192 rows is obtained.

  Next, with the correction blocks 34 of the 192 rows arranged in the vertical direction, the correction block 34 of the 192 rows is divided in the vertical direction from the beginning for each byte, and each divided data is divided. On the other hand, 16 ECC outer codes (PO (Pality Out) codes) 32 are added. Note that the ECC outer code 32 is also added to the portion of the ECC code 31 in the correction block 34.

Through the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. At this time, the total amount of information included in one ECC block 30 is
(172 + 10) bytes × (192 + 16) rows = 37856 bytes, of which the data recorded in the actual data area 24 is
It becomes 2048 bytes × 16 = 32768 bytes.

  In the ECC block 30 shown in FIG. 2B, 1-byte data is indicated by “D #. *”. For example, “D1.0” indicates 1-byte data arranged in the first row and 0th column, and “D190.170” indicates 1-byte data arranged in the 190th row and 170th column. Show. Accordingly, the ECC inner code 31 is arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.

  Furthermore, one correction block 34 is continuously recorded on the DVD-RW. Here, as shown in FIG. 2B, the ECC block 30 is configured so as to include both the ECC inner code 31 and the ECC outer code 32 in the horizontal (horizontal) direction in FIG. This is because the correction of the data in the ECC is performed by the intra-ECC code 31 and the correction of the data arranged in the vertical (vertical) direction in FIG. That is, in the ECC block 30 shown in FIG. 2B, it becomes possible to perform error correction twice in the horizontal (horizontal) direction and the vertical (vertical) direction, which is used for a conventional CD (Compact Disk) or the like. It is configured to perform error correction more powerfully than the error correction processing.

  More specifically, for example, one correction block 34 (including a total of 182 bytes of data including the ECC code 31 for one row, as described above, is continuously recorded on the DVD-RW. If it is up to 5 bytes, it can be corrected even if it is destroyed by a scratch or the like. However, if all of one row is destroyed by a DVD-RW scratch or the like in 6 bytes or more, the code 31 in the ECC It cannot be corrected. However, even if all the columns are destroyed due to scratches or the like, when viewed from the vertical direction, only one byte of data is destroyed for one ECC outer code 32. Therefore, if error correction is performed using the ECC outer code 32 of each column, even if all of one correction block 34 is destroyed, error correction can be performed correctly and reproduction can be performed accurately. However, considering the occurrence of acquired scratches and the like, it goes without saying that if the damage in the row (horizontal) becomes large, it will lead to an error in the next vertical row (horizontal), so that it will be kept to a minimum. Incidentally, this vertical error can be corrected even if there are 8 vertical columns (16 columns by erasure correction).

  Next, how the data sector 20 configured in the ECC block 30 shown in FIG. 2B is specifically recorded on the DVD-RW will be described with reference to FIG. In FIG. 3, data indicated by “D #. *” Corresponds to the data described in FIG.

  When recording the ECC block 30 on a DVD-RW, first, as shown in FIG. 3A, the ECC blocks 30 are arranged in a line in the horizontal direction for each correction block 34 and interleaved. It is divided into 16 recording sectors 40. At this time, one recording sector 40 includes 2366 bytes (37856 bytes ÷ 16) of information, and the data sector 20 and the ECC inner code 31 or the ECC outer code 32 are mixed therein. However, ID information 21 (see FIG. 2A) in the data sector 20 is arranged at the head of each recording sector 40.

As shown in FIGS. 3B and 3C, one recording sector 40 is divided into data 41 for every 91 bytes, and a sync H is added to each. Thereafter, the recording sector 40 in this state is subjected to 8-16 modulation, whereby one sync frame 42 is formed for each data 41. At this time, one sync frame 42 is composed of a sync H ′ and data 43 as shown in FIG. The amount of information in one sync frame 42 is
91 bytes × 8 × (16/8) = 1456 bytes, and information is written to the DVD-RW disc in a form in which the sync frames 42 are continuous. At this time, one recording sector 40 includes 26 sync frames 42.

  This will be explained together with FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. In other words, the horizontal row is composed of 13 rows including 172 bytes of data, 10 bytes of PI and 4 bytes of sync, 186 bytes, and 12 rows of vertical columns plus one row of PO. There are 26 syncs of 2 bytes from H0 to H25.

  By recording the information on the DVD-RW disc by configuring the physical format described above and performing the 8-16 demodulation and deinterleaving when reproducing the information (see FIG. 3), the original ECC block 30 is recorded. Since the amount of data blocks to be destroyed can be minimized, information can be reproduced most accurately by performing strong error correction as described above. Copy guard information is recorded as a part of data of such an ECC block.

B. "Disk Embodiment"
Next, “disc embodiments” will be described.

  As shown in FIGS. 1 and 7C, the information recording medium of the present invention cannot copy the first information (DVD video content for which copying is prohibited), but the second information ( A DVD video or a self-recorded video content that is not prohibited from being copied) is an information recording medium (optical disc) D that can be copied at least once, and is an area in which the first and second information are recorded. And a recording area R having a first depth d1, and copyright information indicating copy prohibition for the first information and copying allowed at least once for the second information. (For example, a CSS key that allows unlimited copying, one-time copying, two-time copying, etc.) and a second area deeper than the first depth d1 (in the CSS area pr) Of depth d2 An information recording medium characterized by comprising a pre-pit region PR forming a Lippit. In FIG. 1, Le is the irradiation direction of the recording / reproducing laser beam. Further, the information recording medium of the present invention can reproduce the copyright information related to the copy of the second information recorded in the pre-pit area PR.

  Further, as shown in FIGS. 1 and 7C, the information recording medium of the present invention cannot copy the first information (DVD video content for which copying is prohibited). Information (DVD video that is not prohibited from copying or content of self-recorded video, etc.) is an information recording medium (optical disc) D that can be copied at least once, and the second information is stored in a predetermined error correction block. If the first recording area R to be recorded using the first recording method in units and the error correction capability of the predetermined error correction block unit is n bytes as an information amount, the first information is copied. Copyright information indicating prohibition and indicating that at least one copy is possible for the second information, information having an information amount of n bytes or more in the predetermined error correction block unit, Te is an information recording medium characterized by comprising a second recording area for recording (pre-pit region) PR using the second recording method. In the information recording medium of the present invention, the first recording method is phase change recording, and the second recording method is prepit recording.

  The manufacturing process of the information recording medium of the present invention having the above configuration will be described below. As shown in FIGS. 5 to 7, the information recording medium master manufacturing method of the present invention is an information recording medium master manufacturing method for manufacturing the master of the information recording medium D described above. The photosensitive film (second resist layer) 1B, the intermediate layer 1C, and the second photosensitive film (first resist layer) 1D are sequentially laminated, and the thickness of the intermediate layer 1C and the second photosensitive film are laminated. The total thickness of the photosensitive film 1D is the same as the first depth d1 of the recording region R of the information recording medium D, and the first photosensitive film 1B and the intermediate layer 1C. And the thickness of the second photosensitive film 1D is equal to the second depth d2 of the prepit region PR of the information recording medium D, and the first photosensitive film 1D is laminated. By irradiating an exposure laser from above the second photosensitive film 1D with a light intensity of The second photosensitive film 1D and the intermediate layer 1C are exposed to form the recording region R with a first depth d1 on the glass substrate 1A, which is higher than the first light intensity. By irradiating the exposure laser from above the second photosensitive film 1D with a strong second light intensity, the second photosensitive film 1D, the intermediate layer 1C, and the first photosensitive film are exposed. The information recording medium master disc manufacturing method is characterized in that the pre-pit region PR is formed at a second depth d2 on the glass substrate 1A by exposing all of the conductive film 1B.

  Moreover, the information recording medium master manufacturing method related to the present invention is an information recording medium master manufacturing method for manufacturing the master of the information recording medium D as shown in FIGS. In addition, a first photosensitive film (second resist layer) 1B, an intermediate layer 1C, and a second photosensitive film (first resist layer) 1D are sequentially stacked, and the thickness of the intermediate layer 1C and the first layer The total thickness of the two photosensitive films 1D is the same as the depth of the first recording region R of the information recording medium D, and the first photosensitive film 1B and the middle The total thickness of the layer 1C and the second photosensitive film 1D is the same as the depth d2 of the second recording area (prepit area) PR of the information recording medium D. And the exposure laser is applied above the second photosensitive film 1D with the first light intensity. To expose the second photosensitive film 1D and the intermediate layer 1C, thereby forming the first recording region R on the glass substrate 1A, and the first light intensity. By irradiating the exposure laser with a higher second light intensity from above the second photosensitive film 1D, the second photosensitive film 1D, the intermediate layer 1C, and the first layer In this method of manufacturing an information recording medium master, the entire photosensitive film 1B is exposed to form the second recording region PR on the glass substrate 1A.

  Specifically, FIG. 5 shows that when the master of the disk D is manufactured, as described above, the groove area G having a depth of about λ / 16 to be recorded with the signal and the λ / 4 to λ of the prepit area PR only. For example, THMR-IP3100 (Tokyo Ohka Kogyo Co., Ltd.) is used for the first resist layer 1D and the second resist layer 1B to form deep pits of about / 8. The intermediate layer 1C that separates the first resist layer 1D and the second resist layer 1B is formed by forming a photosensitive resist layer made of, for example, polyvinyl alcohol on the glass substrate 1A by spin coating or the like. It becomes. Thus, the second resist layer 1, the intermediate layer 1C, and the first resist layer 1D are sequentially laminated on the glass substrate 1A. The first resist layer 1D and the second resist layer 1B have a low light amount (weak light amount) with respect to the light intensity of the krypton laser having a wavelength of 351 nm for recording (see FIG. 6). The second resist layer 1B has a high light amount (strong light amount) (photosensitivity property 1BB shown in FIG. 6), and is configured to react with each other, as shown in FIGS. 7A to 7C. As described above, in order to form the groove region G and the pre-pit region PR, cutting is performed while switching the light intensity between three levels (strong, normal, and weak).

  Then, the recorded glass substrate 1A is developed. A conductive film such as nickel electroless plating is applied to the recording surface in this state (FIG. 7C), and electrolytic plating of about 250 nm is applied thereto to produce a stamper (FIG. 7D). The following figures are omitted as normal steps, but a stamper is attached to the mold, a resin such as polycarbonate is injection-molded, a phase change recording film is sputtered, a protective film is finally attached, and initialization is performed. To be completed.

  Here, the length of the pre-pit region PR including the CSS data (see FIG. 9) is set as a value exceeding 16 lines of the correctable range in the ECC block. Since one sector is 13 rows as described above, it is assumed that there are at least two sectors, for example, four sectors. By setting this value, even if this pre-pit area cannot be read at the time of playback, the entire ECC block cannot be read as uncorrectable, and the disc cannot be played back. Absent.

  At the time of normal reproduction, in the case of an illegal copy by the CSS data, reproduction is not performed because the key code is different, and reproduction of a reproducible signal is permitted by this key code.

  On the other hand, if this area is, for example, about one sector or less and the amount can be corrected, when this area is overwritten for illegal copying, as an ECC block, Regardless of what is written in the CSS data, an illegal signal to be copied is read out as a result of correction and does not make sense. Therefore, the amount of pre-pits has an important meaning.

  The pre-pitted CSS data is data modulated in accordance with the conventional DVD video specification, and is configured to be in phase synchronization with the LPP address. In addition, as described above, the pit depth is optimized only for this area in the DVD video apparatus when the servo signal such as the RF playback signal and tracking error signal is optimal, or the tracking error signal at the time of recording this area. Since the servo signal is optimized, recording and reproduction can be performed stably.

C. "Configuration of information recording and playback device"
Further, “form of information recording apparatus” will be described. As shown in FIG. 8, the information recording medium recording / reproducing apparatus related to the present invention is an information recording medium recording / reproducing apparatus for recording / reproducing the second information on the information recording medium D, and the information recording medium Based on the sector address read from D, the management means (system controller) 9 for managing the sector address of the recording area R and the recording timing for recording in the recording area R, the sector address of the prepit area PR, and the first address Storage means (memory) 14 for storing copyright information indicating copy prohibition for the information of 1 and copyright information indicating that the second information can be copied at least once; and the copyright information Information generation means (signal processing unit) for sequentially generating error correction block information in a predetermined error correction unit based on the recording information including the second information And a recording means (optical head) 3 for recording a series of the error correction block information in the recording area at the recording timing, and recording in the recording area R based on the copyright information reproduced from the prepit area PR. The error correction block information is sequentially read out and error-corrected in a predetermined error correction unit, thereby reproducing the second information (AV encoding / decoding unit) 6. An information recording medium recording / reproducing apparatus is characterized.

  Further, an information recording medium recording / reproducing apparatus related to the present invention is an information recording medium recording / reproducing apparatus for recording / reproducing the second information on the information recording medium D as shown in FIG. Based on the sector address read from the recording medium D, the management means (system controller) 9 for managing the sector address of the first recording area R and the recording timing for recording in the first recording area R; A sector address of two recording areas (pre-pit areas) PR and copyright information indicating copy prohibition for the first information and copy permission for at least one copy for the second information; Error correction block information in a predetermined error correction unit based on recording information comprising the storage means (memory) 14 and the copyright information and the second information. Information generating means (signal processing unit) 5 for generating, recording means (optical head) 3 for recording a series of the error correction block information in the first recording area R at the recording timing, and the second recording area (Prepit area) Based on the copyright information reproduced from the PR, the error correction block information recorded in the first recording area R is sequentially read out, and error correction is performed in a predetermined error correction unit. An information recording medium recording / reproducing apparatus comprising reproduction means (AV encoding / decoding unit) 6 for reproducing the second information.

  A recording / reproducing apparatus related to the present invention for recording information on a DVD-RW in a physical format having “embodiment of recording format” specifically described with reference to FIGS. A form is demonstrated using FIG. In the following embodiment, in a DVD-RW, prepits in which address information on the DVD-RW is recorded on a land are formed in advance on an information track on which the recording information is to be recorded. At the time of recording, address information on the DVD-RW is obtained by detecting the pre-pits in advance, and the recording position on the DVD-RW on which recording information is recorded is detected and recorded. First, the configuration of the recording / reproducing apparatus related to the present invention will be described with reference to FIG. Here, for example, MPEG2 is adopted as the compression / decompression technique, and a rewritable DVD-RW is cited as an example of the optical disc 1 (D). Further, in the configuration of FIG. 8, many portions normally provided in a so-called DVD device or the like are omitted.

  As shown in FIG. 8, the recording / reproducing apparatus includes a spindle motor 2, an optical head 3, an amplifier unit 4, a signal processing unit 5, an AV encoding / decoding unit 6, a driver 7, a servo unit 8, a system controller 9, and a key input. Section 10, output terminal 11, input terminal 12, interface section 13, track buffer memory 14, memory 15. 1 (D) is an optical disk. In FIG. 8, an optical disc 1 (D) is a recording type optical disc made of, for example, a phase change material. In this embodiment, for example, a so-called DVD-RW disc is used. In the DVD-RW disc, sectors (tracks) are spirally arranged in the disc, the rotation is controlled at a constant linear velocity (CLV), and one block is composed of 16 consecutive sectors. A block is used as the error correction processing unit (ECC block). The optical disk 1 is attached to the spindle motor 2 by a chucking mechanism (not shown).

  The spindle motor 2 is driven to rotate by a driver 7 and rotates the optical disc 1 chucked by a chucking mechanism. The spindle motor 2 includes an FG generator and a rotational position signal detection means such as a Hall element. The FG signal from the FG generator and the rotational position signal from the Hall element are fed back to the servo unit 8 via the driver 7 as a rotational servo signal.

  The optical head 3 uses a semiconductor laser as a light source, forms a laser spot by a laser beam Le on a predetermined track of the optical disk 1 by a collimator lens, an objective lens, and the like, and drives the objective lens by a biaxial actuator. Thus, focusing and tracking of the laser spot is performed. The semiconductor laser is driven by a laser drive circuit, and the biaxial actuator is driven by a driver 7.

  The key input unit 10 includes a plurality of keys operated by the user, and sends key operation input information from the user to the system controller 9. That is, from the key input unit 10, various key operation input information for instructing start of recording, start of reproduction, stop of recording, stop of reproduction, and the like can be input by the user.

  The interface unit (ATAPI) 13 is an interface for transmitting and receiving data to and from a computer, for example, and is an interface of so-called ATAPI (ATA Packet Interface), for example.

  The system controller 9 uses, as key operation input information from the key input unit 10, an LSI (signal) of each unit of the optical disc apparatus according to this mode in accordance with various key operation input information such as recording start, reproduction start, recording stop, and reproduction stop. The processing unit 5, servo unit 8, amplifier unit 4, AV encoding / decoding unit 6 and the like are controlled. Data is transmitted and received via the interface unit 13. For example, when the resolution of an image to be recorded or a scene with a high speed such as a car race is separated, or when control data for setting with priority on recording time is input from the key input unit 10 or the input terminal 12 The system controller 9 recognizes the control data, changes the recording time based on the recognition result, and allows an external user to select the setting.

  Here, for example, when a signal is reproduced from the optical disc 1, an instruction to start reproduction is given from the key input unit 10, and the system controller 9 at this time responds to the instruction to start reproduction by an amplifier unit 4, which will be described later. The servo unit 8 and the driver 7 are controlled. That is, when reproducing a signal from the optical disk 1, the system controller 9 first rotates the optical disk 1 and irradiates a laser spot on the optical disk 1, and is formed in advance on a signal track on the optical disk 1. The address signal is read, the target sector (track) to be reproduced is found from the address information, and the optical head 3 is moved so that the laser spot is arranged on the target sector (track). After the movement to the target sector is completed, signal reproduction from the target sector is started.

  The amplifier unit 4 at the time of reproduction of the optical disk 1 amplifies an RF signal reproduced from the target sector of the optical disk 1 by the optical head 3, and also reproduces a reproduction signal and a tracking and focusing servo signal (tracking error and focus signal) from this RF signal. Error signal). The amplifier unit 4 includes at least an equalizer that optimizes the frequency characteristics of the reproduction signal, a PLL (phase lock loop) circuit that extracts a byte clock from the reproduction signal and generates a speed servo signal, and outputs from the PLL circuit A jitter generator for extracting a jitter component from a comparison between the byte clock and the time axis of the reproduction signal; The jitter value generated by the amplifier unit 4 is sent to the system controller 9, the tracking and focusing servo signal and the speed servo signal are sent to the servo unit 8, and the reproduction signal is sent to the signal processing unit 5.

  The servo unit 8 receives the speed servo signal from the amplifier unit 4 and the focusing and tracking servo signal of the optical head 3, and also receives the rotation servo signal from the spindle motor 2, and responds based on each servo signal. Servo control of the part. More specifically, the servo unit 8 determines the spindle motor 2 based on the speed servo signal generated by the PLL circuit of the amplifier unit 4 according to the disk rotation speed and the rotation servo signal from the spindle motor 2. A rotation speed servo control signal is generated so that the optical disk is rotated at a predetermined rotation speed, that is, the optical disk is rotated at a predetermined constant linear velocity.

  Although details will be described later, in this mode, recording / recording of the optical disc 1 is performed at a recording speed (recording data transfer rate) / playback speed (playback data transfer rate) faster than the maximum data transfer rate at the time of internal compression / decompression. Therefore, the servo unit 8 generates a rotation speed servo control signal for rotating the optical disc 1 at a constant linear speed that matches the recording speed / reproduction speed.

  The servo unit 8 generates an optical head servo control signal for the optical head 3 to accurately focus and track on the optical disc 1 based on the focusing and tracking servo signal. These rotational speed servo control signals and optical head servo control signals are sent to the driver 7. Hereinafter, the recording speed (recording data transfer rate) of the optical disc 1 is referred to as a recording rate, and the playback speed (playback data transfer rate) of the optical disc 1 is referred to as a playback rate.

  The driver 7 operates based on each servo control signal from the servo unit 8, and rotates the spindle motor 2 in accordance with the rotation speed servo control signal from the servo unit 8, and generates an optical head servo control signal. In response, the biaxial actuator of the optical head 3 is driven. In this embodiment, the driver 7 drives the spindle motor 2 according to the rotation speed servo control signal to rotate the optical disc 1 at a predetermined linear velocity, and the driver 7 uses the optical head servo control signal. Accordingly, by driving the biaxial actuator of the optical head 3, focusing and tracking of the laser spot on the optical disc is performed.

  The signal processing unit 5 at the time of reproducing the optical disc 1 performs A / D (analog / digital) conversion on the reproduction signal supplied from the amplifier unit 4, and performs synchronization detection from the digital signal obtained by the A / D conversion. Then, the so-called EFM + signal (8-16 modulation signal) applied to the digital signal is decoded to NRZ (Non Return to Zero) data, and further error correction processing is performed, so that the address data of the sector on the optical disc 1 is obtained. And playback data. The address data and the synchronization signal obtained by the signal processing unit 5 are sent to the system controller 9. Details of the error correction processing and the like performed by the signal processing unit 5 will be described later.

  Here, when the reproduction data is data that is compression-encoded at, for example, an MPEG variable transfer rate, the optical disk device of this embodiment temporarily stores the data in, for example, a 64-Mbyte D-RAM (track buffer memory 14). And the writing / reading of the track buffer memory 14 is controlled to absorb the time fluctuation of the variable transfer rate of the reproduced data. The track buffer memory used in this embodiment means a buffer memory that temporarily stores compressed data. For example, a buffer memory for absorbing a variable transfer rate generally provided in a DVD And a buffer memory used for MPEG encoding and decoding. Management of the storage capacity and storage area of the track buffer memory 14 and writing / reading control are performed by, for example, the system controller 9 via the signal processing unit 5.

  The AV encoding / decoding unit 6 at the time of reproduction of the optical disc 1 is the case where the reproduction data supplied from the track buffer memory 14 is data that is compression-encoded by, for example, MPEG2 and audio data and video data are multiplexed. The multiplexed compressed audio data and compressed video data are separated from each other, and each of them is decompressed and decoded by MPEG2, and further D / A (digital / analog) converted to be output from the output terminal 11 as an audio signal and a video signal. Output. The video signal output from the output terminal 11 is processed by an NTSC (National Television System Committee) encoder (not shown) and displayed on a monitor device, and the audio signal is sent to a speaker (not shown) and emitted. . Note that the decompression decoding speed (data transfer rate at the time of decompression decoding, hereinafter referred to as the decompression rate) in the AV encoding / decoding unit 6 at the time of reproduction is a recording to be described later set at the time of recording. The expansion rate depends on the mode. In other words, the AV encoding / decoding unit 6 is capable of decompression decoding processing according to a plurality of decompression rates, determines the decompression rate according to the recording mode set at the time of recording, and at that rate Perform decompression decoding. The information of the recording mode is recorded on the optical disc 1 together with the recording data as control data, and the control data is read when the optical disc 1 is reproduced and sent to the system controller 9, and the system controller 9 is based on the control data. Thus, the expansion rate of the AV encoding / decoding unit 6 is set. Note that the D / A conversion can also be performed outside the AV encoding / decoding unit 6.

  On the other hand, for example, when performing signal recording on the optical disc 1, a command to start recording is issued from the key input unit 10, and the system controller 9 responds to the recording start command to the amplifier unit 4, the servo unit 8, and the driver 7. To control. That is, when performing signal recording on the optical disc 1, first, the optical disc 1 is rotated and a laser spot is irradiated onto the optical disc 1, and an address signal previously formed as a prepit on the signal track on the optical disc 1 is recorded. The target sector (track) to be recorded is found from the address information, and the optical head 3 is moved so that the laser spot is arranged on the target sector (track). The details of the address signal recorded in advance on the optical disc 1 will be described later.

  Also, audio and video signals to be recorded are input from the output terminal 11, and these signals are sent to the AV encoding / decoding unit 6. At the time of recording on the optical disc, the AV encoding / decoding unit 6 performs A / D conversion on the audio signal and the video signal, and respectively converts the audio data and the video data into MPEG2 compression codes at a speed corresponding to a recording mode to be described later. Are further multiplexed and sent to the signal processing unit 5. Hereinafter, the compression coding speed (data transfer rate at the time of compression coding) in the AV coding / decoding unit 6 will be referred to as a compression rate. That is, the AV encoding / decoding unit 6 can perform compression encoding at a plurality of compression rates according to the recording mode.

  The 64-Mbit D-RAM 15 serving as a memory is a memory for temporarily storing data when the AV encoding / decoding unit 6 performs compression / decompression. A / D conversion can also be performed outside the AV encoding / decoding unit 6.

  In addition to video and audio information, this type of apparatus can also record and reproduce data such as still image information and computer program files. In this case, data such as still image information and program files are supplied from the interface unit 13, and these data are sent to the signal processing unit 5 via the system controller 9.

  In the signal processing unit 5 at the time of recording on the optical disc, an error correction code is added to the compressed data from the AV encoding / decoding unit 6 and the data such as the program file via the system controller 9, and NRZ and EFM + Encoding is performed, and further, a synchronization signal supplied from the system controller 9 is added to generate recording data.

  Here, the recording data is temporarily stored in the track buffer memory 7 and then read out from the track buffer memory 7 at a reading rate corresponding to the recording rate on the optical disc 1. Details of the storage capacity and storage area management and write / read control of the track buffer memory 7 at the time of recording will be described later. The recording data read from the track buffer memory 7 is subjected to predetermined modulation processing by the signal processing unit 5 and sent to the amplifier unit 3 as a recording signal. The optical head 3 uses the target sector ( Track).

  At this time, the system controller 9 performs A / D (analog / digital) conversion of the jitter value from the amplifier unit 4 and measures the waveform, and the waveform correction in the amplifier unit 4 at the time of recording is performed according to the measured jitter value and asymmetry value. Change the amount. That is, when a signal is recorded on the optical disc 1, the amplifier unit 4 corrects the waveform of the signal from the signal processing unit 5 and sends the waveform-corrected signal to the laser drive circuit of the optical head 4.

  Next, the address of the data area on the optical disc 1 according to the embodiment of the present invention will be described below.

  The optical disk 1 of the present embodiment is a DVD-RW disk that is compatible with DVD video, DVD audio, DVD-ROM, and the like and conforms to the DVD standard. In addition to this DVD-RW, a write-once or rewritable optical disc usually has a sector address recorded or formed in advance on the disc in order to enable address control during recording. However, in the existing optical disk, address recording is performed by wobbling the groove according to the frequency modulated based on the address data. However, in the case of the DVD-RW of the present embodiment, it is more In order to enable high-speed and high-density recording, a so-called LPP (land pre-pit) addressing system is employed in which predetermined pits are formed in the land portion on the optical disc together with the wobbling frequency signal of the groove.

  Here, when data is actually recorded on the optical disc 1, a sector address (hereinafter simply referred to as an LPP address) based on an LPP address that is pre-recorded on the optical disc 1 and is also a recording timing signal, and actually In general, a sector address (hereinafter referred to as a data address) included in recording data to be recorded is matched. As an example of data recording in which the LPP address and the data address coincide with each other, for example, data reproduced from a normal DVD can be recorded on a DVD-RW. In this case, data is continuously recorded on the DVD-RW disc, so that the relationship between the LPP address and the data address can be made to coincide.

  Next, the recording operation of the copy guard area handled in the embodiment of the present invention will be described below. In this embodiment, one error correction block (ECC block) is composed of 16 data sectors (32 kBytes) continuous in the data area, and this ECC block is the minimum basic unit at the time of recording and reproduction. . Each data sector is composed of a sync frame having 26 syncs recorded in synchronization with an LPP address and a sync timing signal for recording. Further, in DVD-RW, sector addresses are formed at predetermined intervals.

  As shown in FIGS. 9A to 9C, the prepit area PR of the copy guard area is arranged in advance in an area for four sectors of the ECC block. When recording this pre-pit area PR, the system controller 9 stores the pre-pit data for 4 sectors stored in the system controller ROM and the data to be recorded in this ECC block for the other 12 sectors. The track buffer memory 14 is used to generate correction additional data (PI, PO) of the ECC block, and the data from the first part of the generated data to the prepit start position is converted into an LPP sync signal (see FIG. 9 (B), the data is recorded with reference to the timing of the timing signal (sync) shown in the figure. At the start timing of the prepit area PR, the recording is temporarily stopped, the playback state is set, and then the prepit area PR ends. The recording signal at the end position of the pre-pit of the ECC block again at the LPP sync signal timing Performing the recording. Then, recording of a predetermined ECC block is finished.

  With this method, one ECC block has two linking. For example, the data area of about 2 sync frames * 2 may be destroyed due to the amplitude fluctuation at this joint, the phase shift of the recording signal, etc. during reproduction. No error occurs, and the copy guard data composed of the pre-pits can be reproduced stably.

  In the playback device, the data copied illegally due to the key data recorded in this pre-pit cannot be played back because the key data is different. On the other hand, for personal data shot with a video camera etc. Playback by DVD video or the like is possible with the key information. The contents of the disk structure, manufacturing method, and recording / reproducing procedure are merely examples, and are not limited to this range. In the above-described embodiment of the present invention, the DVD video has been described. Needless to say, the present invention can also be applied to a medium capable of high-density recording other than DVD audio.

It is an expanded sectional view for demonstrating one Example of the information recording medium of this invention. It is a figure for demonstrating making the data recorded on the information recording medium of this invention into ECC block. It is a figure for demonstrating recording the data made into ECC block on the predetermined area | region of the information recording medium of this invention per sector. It is a figure which shows the physical format of 1 sector in DVD-RW which is one Example of the information recording medium of this invention. It is a figure for demonstrating the lamination | stacking state of the glass original disk used for the information recording medium original disk manufacturing method relevant to this invention. It is a light quantity vs. sensitivity characteristic view of a resist layer laminated on a glass master. It is a figure for demonstrating the process of the information recording medium original disc manufacturing method relevant to this invention. It is a block diagram for demonstrating the information recording-medium recording / reproducing apparatus relevant to this invention. It is a figure for demonstrating the relationship between the data recorded on the predetermined area | region of the information recording medium of this invention, and an ECC block.

Explanation of symbols

1, D disc, optical disc (information recording medium)
1A Glass substrate 1B Second resist layer 1C Intermediate layer 1D First resist layer 3 Optical head 5 Signal processing unit 6 AV encoding / decoding unit 9 System controller 14 Track buffer memory d1, d2 depth (first and second depths) Sa)
G groove area pr recording position PR pre-pit area R recording area

Claims (2)

The first information cannot be copied, but the second information is an information recording medium that can be copied at least once.
An area for recording the first information and the second information, respectively, and a recording area having a first depth;
An area for recording copyright information indicating copy prohibition for the first information and indicating that copying is possible at least once for the second information, and deeper than the first depth. An information recording medium comprising: a prepit area in which prepits having a second depth are formed.   2. The information recording medium according to claim 1, wherein the recording area is a phase change recording area, and the copyright information recorded in the prepit area is reproducible.

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