JP4666042B2 - Information recording medium, information recording medium recording method, and information recording medium reproducing method - Google Patents

Description

The present invention relates to a DVD video and a high-density optical disc recorded based on the RTR (real-time recording) standard that is not compatible with DVD video, and a DVD-RW that is compatible with DVD video as a physical standard. Information recording medium, information recording medium recording method, and information recording medium reproduction capable of recording and reproducing contents such as video and audio on a high-density optical disc of (DVD-RW Re-rewritable) standard corresponding to copyright information mETHODS about.

In general, in DVD-RW and other high-density recording discs that can be recorded multiple times with compatibility with DVD video, copyright-protected content and non-copyrighted content are identified, and illegally copied content illegally (Recording and playback) must not be performed.
A DVD video is a reproduction-only disc, and copyright information prohibiting copying of content is recorded in a predetermined area (information area relating to copyright protection such as a CSS key) of the disk by CSS (content scramble system). (CSS key recording). 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 type disc that can be recorded a plurality of times, a disc that can be recorded only once, such as a DVD-R, is a predetermined disc on which a DVD video CSS key is recorded in a normal state. In this area (CSS area), a special code other than the CSS key is recorded at the time of shipment, and processed so that the CSS key cannot be overwritten later. As a result, when a DVD-R in 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 corresponding to the content cannot be read. Video content cannot be played. As a result, copyright protection of copy-prohibited DVD video can be achieved.
JP 09-055025 A

As described above, since the DVD-R can be recorded only once, the CSS key is set to a predetermined value (a value other than that recognized as a CSS key, for example, all zeros in which data is filled with “0”). If it is recorded as “0” or the like, it is possible to protect the copyright of the content of the DVD video whose copy is prohibited. On the other hand, in the above-described high-density type disc that can be recorded a plurality of times, special data (a value other than that recognized as a CSS key, for example, data of all “0”) is stored in the CSS area like DVD-RW. Even if an all-zero “0” is recorded, if the regular CSS key corresponding to the content (CSS key for copy permission) is overwritten, the content of the copy-prohibited DVD video is recorded. It can be easily copied and played. 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. Further, in high-density discs that can be recorded a plurality of times, it has been required that the content of DVD videos that are not prohibited to be copied or self-recorded video content can be reproduced and copied as necessary.
Furthermore, even when using an optical disc on which content based on the RTR standard that is not compatible with the DVD video standard is used, the content must be copied (recorded and reproduced) in accordance with the content of the copyright information. I must.

Accordingly, the present invention provides a first lead-in information area in which lead-in information related to the content recorded in the data area is recorded at a first depth, and copyright protection related to the content recorded in the data area. Is recorded in the data area by forming a second lead-in information area on the information recording medium in which the prepits having a second depth substantially deeper than the first depth are recorded. A first lead-in information area in which lead-in information related to the content is recorded, and a second lead recorded so that information related to copyright protection related to the content recorded in the data area cannot be erased By forming the in-information area on the information recording medium, for example, in the first recording / reproducing mode, for example, the RTR recording / reproducing mode, content copying ( In the case of reproduction in the second recording / reproducing mode such as the DVD compatible recording / reproducing mode, the content of information related to copyright protection such as CSS key is formed by pre-pits. Information such as that the content of information related to copyright protection such as CSS key cannot be reproduced, but the content that is not copy-prohibited can be copied (recorded and reproduced). recording medium or a recording medium recording method using the information recording medium, and to provide an information recording medium reproducing how.

To solve the problems described above, the present invention provides the information recording medium having a structure of the following (1) to (3), the information recording medium recording method, and information recording medium reproducing how the.
(1) and the first lead-in information area and the second lead-in information area is formed in the lead-in area, and an information recording medium forming the data region that enables recording data,
The first lead-in information area, wherein for recording lead-in information related to the data recorded in the data area, an area of the phase change recording method that is formed by a first depth,
The second lead-in information area includes a phase-change recording area formed at the first depth, and lead-in information related to data recorded in the data area is the first depth. substantially deeper second depth information recording medium, wherein the benzalkonium formed as pit area than is.
(2) In an information recording medium recording method for recording data on the information recording medium of (1 ) above,
Generating data to be recorded as recording information corresponding to the area of the phase change recording method;
Recording the recording information in an area of a phase change recording system other than the pre-pit area;
An information recording medium recording method comprising:
(3) In an information recording medium reproducing method for reproducing recorded data from the information recording medium recorded by the information recording medium recording method of (2 ) above,
The step of continuously reproducing the recording information in the data area according to the lead-in information in the first lead-in information area or the lead-in information in the second lead-in information area
An information recording medium reproducing method comprising:

  According to the present invention having the above-described configuration, self-recorded content can be copied (recorded and reproduced) in the first recording mode such as the RTR recording mode, and the second recording mode such as DVD. In compatible recording mode, copy-prohibited DVD-Video content cannot be copied (even if recorded, it cannot be reproduced due to inconsistencies in copyright protection information such as CSS keys), but copyright information that is not prohibited from being copied When content corresponding to the above is recorded, it is possible to provide a reproducible information recording medium, method and apparatus thereof.

Hereinafter, an information recording medium, an information recording medium recording method, an information recording medium recording apparatus, an information recording medium reproducing method, and an information recording medium reproducing apparatus 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 the physical format of one sector, FIG. 5 is a diagram for explaining the laminated state of the glass master used in the master manufacturing method for producing the information recording medium of the present invention, and FIG. 6 is a resist laminated on the glass master. FIG. 7 is a diagram for explaining the steps of the master manufacturing method for producing the information recording medium of the present invention, FIG. 8 is a block diagram for explaining the information recording medium recording / reproducing apparatus, and FIG. 9 is book FIG. 10 is a diagram for explaining the relationship between data to be recorded in a predetermined area of the bright information recording medium and the ECC block, FIG. 10 is a diagram for explaining the lead-in area and the data area of the information recording medium of the present invention, 11 and 12 are main flowcharts for explaining the information recording medium recording and reproducing method of the present invention, respectively.

  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 disks such as DVD + RW and next-generation DVD.

First, before describing the embodiment of the present invention, lead-in information including, for example, a CSS key, which is information related to copyright protection, is recorded in the lead-in area on the disc so that it can be read stably. The points to be described will be described. This point is obtained by satisfying all of the following (i) to (iii).
That is, (i) the lead-in information including the CSS key is written in the first lead-in information area LI1 (the CSS key may be omitted) in the lead-in area LI at the time of content recording, and the second lead-in information area Record in advance in LI2. If there is a CSS key in the first lead-in information area LI1, it is recorded so that it can be re-recorded, and the second lead-in information area LI2 is related to copyright protection such as a CSS key of a predetermined value. Information is recorded so that it cannot be re-recorded (for example, information related to copyright protection such as a CSS key is formed with pre-pits). (ii) At the time of recording or reproduction, if there is a CSS key in the first lead-in information area LI1 in the first recording mode, the lead-in information including this is recorded, and the first lead-in is recorded in the first reproduction mode. If there is a CSS key recorded in the information area LI1, lead-in information including the CSS key is reproduced. In addition, when there is a recordable area in the second lead-in information area LI2 in the second recording mode, the lead-in information excluding information related to copyright protection such as a CSS key is recorded, and the second reproduction is performed. In the mode, lead-in information including information related to copyright protection such as a CSS key recorded in the second lead-in information area LI1 is reproduced. (iii) Information related to copyright protection such as CSS key recorded in the second lead-in information area LI2 so as not to be re-recorded is error-corrected for information related to copyright protection such as CSS key. Therefore, it is composed of a predetermined number or more of pit rows so that they cannot be tampered with.

  By satisfying all of the above (i) to (iii), it is assumed that information related to copyright protection such as CSS key is maintained in the reproduction compatible machine, and content prohibited to copy by copyright is recorded in the data area DA. On the other hand, contents that can be copied for copyright-free or copyright-free contents can be reproduced even if they are recorded in the data area DA. Protection is possible.

In other words, the above-described matters will be described in detail, and it can be said that the present invention successfully solves all of the following problems (1) to (4).
(1) The DVD video is a reproduction-only disc, and the CSS key and recorded content recorded in a part of the position corresponding to the second lead-in area in FIG. 10 are all composed of pits. The depth is about λ / 4 for a laser having a wavelength of 650 nm. 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 (λ / 10 to λ / 18).
For this reason, when a CSS key in DVD video is recorded on a DVD-RW, information related to copyright protection such as the CSS key is not composed of a pre-pit having a depth of about λ / 16 of the DVD-RW. / 4 to λ / 8 deep prepits. Thereby, the DVD video player can satisfactorily reproduce information related to copyright protection such as a deep pre-pit CSS key of about λ / 4 to λ / 8 in the DVD-RW.

(2) Also, in a DVD video player, copyright such as a CSS key having a deep prepit of about λ / 4 to λ / 8 recorded in a part of the second lead-in area shown in FIG. Even if the information area related to protection can be successfully reproduced, the information related to copyright protection such as the CSS key is an ECC including the information recording area (pre-pit area PR) related to copyright protection such as the CSS key. If the amount of data is small within the range of the block correction capability, errors are corrected during reproduction, and the CSS key can be read. Therefore, the present invention sets the data amount of information related to copyright protection such as CSS keys configured by prepits to a data amount exceeding a predetermined range exceeding the range of error correction capability, and information related to copyright protection of CSS keys and the like. If the content cannot be read, the content cannot be reproduced to prevent illegal copying of the content.

(3) Next, if there is a recordable area other than the pre-pit area PR of the second lead-in area in FIG. 10, at the time of recording, the copyright of the CSS key etc. recorded in this pre-pit area PR is protected. Relevant information is stored in a memory such as a ROM on the recording / reproducing apparatus side, or obtained as an input signal from the outside, and information related to copyright protection such as a pre-pitted CSS key and contents are stored in the ECC block. By configuring data and recording this data in the lead-in information area other than the pre-pit area PR, the ECC block can be reproduced as data including information related to copyright protection such as a CSS key during reproduction.

(4) With the above method, it is possible to handle playback compatibility of content that does not require copyright protection. Next, content that does not require copyright protection may be recorded, for example, in the RTR standard (real-time recording) that is not compatible with DVD video, for example, which is under discussion at the DVD Forum.
For this purpose, the present invention assigns the above items (1) to (3) to the second lead-in information area LI2, which will be described later, at the same physical position as the lead-in information area of the DVD video. Lead-in information such as information related to protection is formed by pre-pits, and lead-in information compliant with the RTR standard is recorded in a first lead-in information area LI1 described later. By configuring, it is configured to satisfy both standards.

Now, embodiments of the present invention will be described in the following order.
A. "Embodiment of recording format"
B. "Disk Embodiment"
C. “Embodiment of Information Recording 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 error correction processing in the recording information (lead-in 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 (Parity 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 (Parity 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, correct error correction can be performed 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 (information relating to copyright protection such as a CSS key) in the copy guard information area located in the second lead-in information area 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 10, the information recording medium of the present invention has a first lead-in provided corresponding to a first recording / playback mode (for example, an RTR playback mode (playback by an RTR playback player)). An information area LI1 and a second lead-in information area LI2 provided corresponding to a second recording / playback mode (for example, a DVD compatible playback mode (playback by a DVD playback player)) are formed in the lead-in area LI. And an information recording medium (optical disc) D in which a data area DA for recording content (content such as video and audio) is formed,
In the first lead-in information area LI1, lead-in information (lead-in information such as disc manufacturing information and content start position information) corresponding to the content recorded in the data area DA has a first depth d1. Is an area recorded in
The second lead-in information area LI2 includes information relating to copyright protection and lead-in information (disc manufacturing information, content start position information) related to the contents (contents such as video and audio) recorded in the data area DA. The information recording medium is a region formed of prepits having a second depth d2 that is deeper than the first depth d1.

As shown in FIGS. 1 and 10, the information recording medium of the present invention has a first recording / reproducing mode (for example, an RTR reproducing mode (reproduction by an RTR reproducing player)) provided in correspondence with the first recording / reproducing mode. A lead-in information area LI1 and a second lead-in information area LI2 provided corresponding to a second recording / playback mode (for example, a DVD compatible playback mode (playback by a DVD playback player)) are included in the lead-in area LI. An information recording medium (optical disc) D formed and formed with a data area DA for recording content (content such as video and audio),
The first lead-in information area LI1 includes lead-in information (disc manufacturing information, content start position information, etc.) corresponding to contents recorded in the data area DA in predetermined error correction block units (ECC block units). Is the area where the lead-in information) is recorded,
The second lead-in information area LI2 is related to contents (contents such as video and audio) recorded in the data area DA when the error correction capability in the predetermined error correction block unit is n bytes as an information amount. Information related to copyright protection (CSS key, etc.) is recorded as information having an amount of information of n bytes or more in the predetermined error correction block unit so that it cannot be erased (it cannot be altered when overwritten), and An information recording medium characterized in that it is an area in which lead-in information (lead-in information such as disc manufacturing information and content start position information) is recorded.

  In the information recording medium of the present invention, the lead-in information includes flag information indicating the validity of the lead-in information (information indicating a category such as standard information or version information). Yes.

  The information recording medium of the present invention is a phase change recording medium, and the second copyright information is reproducible. In FIG. 1, G is a groove area, L is a land area, and Le is an irradiation direction of a recording / reproducing laser beam.

Hereinafter, the manufacturing process of the information recording medium having the above-described configuration will be described.
That is,
The second resist layer 1B, the intermediate layer 1C, and the first resist layer 1D are sequentially laminated on the glass substrate 1A, and the thickness of the intermediate layer 1C and the thickness of the first resist layer 1D is equal to the thickness of the optical disc D. The thickness of the second resist layer 1B, the intermediate layer 1C, and the thickness of the first resist layer 1D is equal to the depth d2 of the prepit region PR of the optical disc D. Laminate to be the same,
By irradiating an exposure laser with a first light intensity from above the first resist layer 1D, the first resist layer 1D and the intermediate layer 1C are exposed to form a recording region R on the glass substrate 1A. ,
All of the first resist layer 1D, the intermediate layer 1C, and the second resist layer 1B are exposed by irradiating an exposure laser from above the first resist layer 1D with a second light intensity higher than the first light intensity. This is a master manufacturing method for forming the prepit region PR on the glass substrate 1A.

  Specifically, FIG. 5 shows a groove area G having a depth of about λ / 16 (range from λ / 10 to λ / 18) at which a signal is to be recorded, as described above, at the time of manufacturing the master of the disk D. In order to form deep pits of about λ / 4 to λ / 8 only in the prepit region PR, the first resist layer 1D and the second resist layer 1B use, for example, THMLIP3100 (Tokyo Ohka Kogyo Co., Ltd.). . 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 quantity (weak light quantity) 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 μm is applied thereto to form 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. As a result, in FIG. 10, the data area DA other than the second lead-in information LI2 area and the first lead-in information LI1 area become groove areas which are recordable areas having a depth of about λ / 16.

  Here, the length (see FIG. 9) of the prepit region PR including the CSS key formed by the prepits described above 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 the pre-pit area cannot be read at the time of playback, the entire ECC block cannot be read as uncorrectable, so even if the content itself can be recorded, the content cannot be played back. Illegal copying is never done.

  During normal playback, the content scrambled by CSS is illegally recorded in the data area by using a predetermined CSS key such as all 0, which is determined in advance. Since the key code is different from the predetermined all-zero CSS key, for example, it is not reproduced without being scrambled. For example, a reproducible signal that is not scrambled is permitted to be reproduced.

  On the contrary, if this area is, for example, about one sector or less and the amount of correction is possible, the amount of correction that can be corrected is overwritten on this area for illegal copying. Moreover, as an ECC block, no matter what is written in the CSS key, an illegal signal to be copied is read out as a result of correction, and it does not make sense. Therefore, the data amount of the pre-pitted CSS key has an important meaning.

The pre-pitted CSS key is data modulated in accordance with the conventional DVD video specification, and has a configuration 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. “Embodiment of Information Recording Device”
Further, an “embodiment of the information recording apparatus” will be described.

  FIG. 10 schematically shows an area from the inner periphery to the outer periphery of the disk. Here, the lead-in area LI is located on the inner peripheral side from the data area DA. In this lead-in area LI, the first lead-in information area LI1 and the second lead-in information area LI1 are used as areas for recording and reproducing lead-in information such as disc manufacturing information and content start position information (CSS key related to copy guard). Lead-in information area LI2 area. In this embodiment, the two areas LI1 and LI2 are each composed of 192 ECC blocks. The lead-in information includes flag information indicating the validity of the lead-in information. The first lead-in information area LI1 and the second lead-in information area LI2 are all normal recording areas R (phase change recording layers). Zero (“0”) is recorded as data in an area excluding the two areas LI1 and LI2 from the lead-in area LI.

  Hereinafter, recording for recording / reproducing information (lead-in information and content) on a DVD-RW in a physical format having “embodiment of recording format” specifically described with reference to FIGS. An embodiment of a playback device will be described with reference to 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 information, it is assumed that address information on the DVD-RW is obtained by detecting the pre-pits in advance, and a recording position on the DVD-RW on which recording information is recorded is detected and recorded.

  First, the configuration of a recording / reproducing apparatus for recording / reproducing the information recording medium of 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 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, the key input unit 10 allows the user to input various key operation input information for instructing recording start, reproduction start, recording stop, reproduction stop, and the like.

  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 the LSI of each part of the optical disk apparatus according to the present embodiment as key operation input information from the key input unit 10 according to various key operation input information such as recording start, reproduction start, recording stop, and reproduction stop. (Signal processing unit 5, servo unit 8, amplifier unit 4, AV encoding / decoding unit 6, etc.) are controlled. Data is transmitted and received via the interface unit 13. For example, control data for setting the resolution of an image (content) to be recorded, a scene having a high speed such as a car race, or setting with priority on recording time is input from the key input unit 10 or the input terminal 12. In this case, 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 bit clock from the reproduction signal and generates a speed servo signal, and a PLL circuit A jitter generator for extracting a jitter component from a comparison between the bit clock and the time axis of the reproduced 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 the present embodiment, the optical disc 1 is recorded at a recording speed (recording data transfer rate) / reproduction speed (reproduction 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 the present embodiment, the driver 7 drives the spindle motor 2 in accordance with the rotation speed servo control signal to rotate the optical disc 1 at a predetermined linear velocity, and the driver 7 controls the optical head servo. By driving the biaxial actuator of the optical head 3 in accordance with the signal, 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 modulated 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. The details of 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 apparatus according to the present embodiment stores the data in, for example, a 64-Mbyte D-RAM (track buffer memory 14). By temporarily storing and controlling writing / reading of the track buffer memory 14, the time fluctuation of the variable transfer rate of the reproduced data is absorbed. The track buffer memory used in the present embodiment is a buffer memory that temporarily stores compressed data, for example, for absorbing a variable transfer rate generally provided in a DVD. It includes a buffer memory 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, the apparatus according to the present embodiment can record and reproduce still image information and data such as a program file on a computer. 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 to 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 disc 1 according to the present embodiment is a DVD-RW disc that is compatible with contents recorded on DVD video, DVD audio, DVD-ROM, and the like and conforms to the recordable 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 adopted in which predetermined pits are formed in land portions on the optical disk 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, recording in a second lead-in area including a copy guard area (information area relating to copyright protection (recording area such as CSS key data), pre-pit area PR), which will be described later with reference to FIG. 9 handled in the embodiment of the present invention. The reproduction operation will be described below.
This apparatus is configured so that, for example, recording in the RTR recording mode or recording in the DVD video compatible recording mode can be selected, for example, by the key input and the system controller 9 determining (FIG. 11, FIG. 12). For example, the selection may be automatically determined according to the type of the input signal.

  That is, in the recording operation, as shown in FIG. 11, for example, if the recording mode is the RTR recording mode, the content is recorded in the data area DA and the CSS key is included in the first lead-in information area LI1 (described later). In this case, the lead-in information is recorded (steps S1 and S2). On the other hand, if the recording mode is not the RTR recording mode but the DVD compatible recording mode, for example, the content is recorded in the data area DA, and the ECC block configuration of Example 1 in FIG. In the lead-in information area LI2 of 2, the lead-in information excluding information related to copyright protection such as the CSS key of the prepit (24K bytes (= 32-8) since 1 ECC block is 32K bytes) is recorded (steps S3 and S4). ). Also, if the ECC block configuration of Example 2 in FIG. 9 (32K bytes of one ECC block is configured with pre-pits), the process proceeds to the next step without performing recording.

  In the RTR recording mode, content and lead-in information can be recorded in real time, but it is not compatible with DVD video. On the other hand, in the DVD compatible recording mode, content with complicated editing cannot be recorded in real time (since the CSS key is formed so that it cannot be re-recorded), but it is compatible with DVD video. It can be played on DVD video players currently on the market. As described above, since the recording mode to be used has respective advantages and disadvantages, the recording mode can be selected in accordance with the recording environment.

  In FIG. 11, after the recording operation is started, “RTR recording” is performed in step S1, “recording in the first lead-in” is performed in step S2, “DVD compatible recording” is performed in step S3, and “second recording is performed in step S4”. The flow of “record in lead-in” is shown, but not limited to this, after starting the recording operation, “DVD compatible recording” in step S1, and “record in second lead-in” in step S2, or not recording, step The flow may be “RTR recording” in S3 and “recording in the first lead-in” in step S4.

Next, the reproduction operation will be described. In the present plan, there are three types of DVD discs according to the present invention that can be regarded as having substantially the same physical characteristics at the time of starting to perform reproduction. At the physical radius position in FIG. 10, the first DVD video already sold has only the second lead-in information area including the CSS key, not the first lead-in information area, and the second lead-in information area. DVD-RW version 1.0 has a first lead-in information area and a second lead-in information area that cannot be read at the position of the second lead-in information area in the figure, and the third RW of the present plan. This proposal is a disc having first lead-in information that can be read and second lead-in information including information relating to copyright protection such as a CSS key having a predetermined value.
In the reproducing operation, as shown in FIG. 12, first, when information is recorded by reading the first lead-in information area LI1, a flag of the recorded lead-in information (disc type and version information (media type)) ), The lead-in information including the CSS key of the first lead-in information area LI1 (the CSS key may be omitted) is reproduced. Then, the reproduction process of the content recorded in the data area DA is performed (for example, in the RTR reproduction mode) according to the reproduced lead-in information (steps S5, S6, S7). On the other hand, with reference to the flag of the first lead-in information area LI1, it is detected that the lead-in information is not valid or the first lead-in information area is necessary (or the signal cannot be reproduced). If it is detected that the lead-in information is valid with reference to the flag of the second lead-in information area LI2 (detects whether the signal is reproducible), The lead-in information including the CSS key recorded in the pre-pit of the second lead-in information area LI2 is reproduced, and the content recorded in the data area DA is reproduced according to the reproduced lead-in information (for example, DVD (In compatible playback mode) (steps S8, S9). Here, depending on the relationship between the playback device and the lead-in information including the CSS key, the playback process is stopped.

  In FIG. 12, after the reproduction operation is started, “first lead-in reproduction” in step S5, “valid” in step S6, “reproduction according to the first lead-in” in step S7, and “first reproduction in step S8”. 2 ”, the flow of“ playback according to the second lead-in ”is shown in step S9. However, the present invention is not limited to this, and after the start of the playback operation,“ second lead-in playback ” Even if the flow is “valid” in step S6, “playback according to second lead-in” in step S7, “first lead-in playback” in step S8, and “playback in accordance with first lead-in” in step S9. good. In this way, even if there are three types of discs, the second lead-in area can be played back by the above method, the copyright protection information of a predetermined value can be read, and the above playback method can be used. Maintains compatibility with each other and enables copyright protection during playback. Alternatively, an abnormal operation that occurs because the information in the second lead-in area cannot be reproduced depending on the reproduction apparatus is prevented.

  By the way, in this embodiment, one ECC block is constituted by 16 consecutive data sectors (32 kbytes) in the data area DA, 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.

Specifically, as shown in FIGS. 9B and 9C, the pre-pit area of the copy guard area of the second lead-in area (information area related to copyright protection in which a predetermined CSS key value or the like is recorded). The PR is a copy guard area (predetermined CSS key) of the second lead-in area, as shown in FIGS. 9 (F) and 9 (G). The pre-pit area PR of the information area relating to copyright protection in which values and the like are recorded will be described in Example 2 that is arranged in advance in all 16 sectors of the ECC block.
When recording in this ECC block area in Example 1, the system controller 9 should record the pre-pit data for 4 sectors stored in the syscon ROM and the ECC block for the other 12 sectors. The ECC block correction additional data (PI, PO) is generated using the track buffer memory 14 described above. Then, data from the first portion of the generated data to the prepit start position is recorded with reference to the timing of the LPP sync signal (timing signal shown in FIG. 9B). At the start timing of the pre-pit area PR, recording is temporarily stopped and a reproduction state is set. Next, recording is performed again from the recording signal at the prepit end position of the ECC block at the LPP sync signal timing when the prepit ends. Then, recording of a predetermined ECC block is finished. In Example 2, since all the ECC blocks are configured as the prepit area PR, it is not necessary to record them.

On the other hand, at the time of reproduction by the DVD video reproduction apparatus, the second lead-in information area LI2 is reproduced, and reproduction is performed based on this information. Here, depending on the relationship between the playback device and the lead-in information including the CSS key, the playback process is stopped. When playing back with this recording / playback apparatus (see FIG. 9), the first lead-in information area LI1 is played back first, and if there is no lead-in information as a result of playback, or the flag of the lead-in information (disc When the type and version information (media type) are invalid, or in addition to the lead-in information, information related to copyright protection in the second lead-in LI2 area (a predetermined CSS key such as all 0) (Or copyright management information proposed as a copy protection method) is read, the second lead-in LI2 area is reproduced. Then, reproduction is performed based on this information. On the contrary, when the first lead-in information area LI1 is reproduced and there is lead-in information as a result of the reproduction, and when the flag of the lead-in information is valid, reproduction is performed based on this information. .
In the case of Example 1, there are two linkings (joints) in one ECC block. 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 copy guard data (information relating to copyright protection) composed of the pre-pits can be reproduced stably.

As described above, in the playback device, the illegally copied content is different from the information related to copyright protection such as the CSS key recorded in the prepit, and the information related to copyright protection such as the CSS key is different. On the other hand, content such as personal data shot by a video camera or the like can be played back on a DVD video or the like based on copyright protection information such as the CSS key.
Note that the contents of the disc 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.
In the present embodiment, the pit depth of the pre-pit area is physically different (d1 <d2), but substantially corresponds to a depth of about λ / 4 to λ / 8. I just need it.
In the present embodiment, the depth of the groove area for recording the first lead-in and data is substantially about λ / 10 to λ / 18, with the depth centered at λ / 16. As long as it corresponds to the depth of.
In the above-described embodiment, the state in which the lead-in information including the copyright protection information (CSS key) is recorded in the first lead-in information area LI1 has been described. However, the present invention is not limited to this. Of course, the present invention can be similarly applied to a state in which lead-in information that does not include copyright protection information (CSS key) is recorded in the first lead-in information area LI1.

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 original disk manufacturing method which produces the information recording medium of 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 original disc manufacturing method which produces the information recording medium of this invention. It is a block diagram for demonstrating an information recording medium recording / reproducing apparatus. 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. It is a figure for demonstrating the lead-in area | region and data area | region of the information recording medium of this invention. It is a main flowchart for demonstrating the information recording medium recording method of this invention. It is a main flowchart for demonstrating the information recording medium reproduction | regeneration method of this invention.

Explanation of symbols

1, D disc, optical disc (information recording medium)
DA data area d1 first depth d2 second depth PR pre-pit area R recording area LI lead-in area LI1 first lead-in information area

Claims (3)

A first lead-in information area and the second lead-in information area is formed in the lead-in area, and an information recording medium forming the data region that enables recording data,
The first lead-in information area, wherein for recording lead-in information related to the data recorded in the data area, an area of the phase change recording method that is formed by a first depth,
The second lead-in information area includes a phase-change recording area formed at the first depth, and lead-in information related to data recorded in the data area is the first depth. substantially deeper second depth information recording medium, wherein the benzalkonium formed as pit area than is. An information recording medium recording method for recording data on the information recording medium according to claim 1,
Generating data to be recorded as recording information corresponding to the area of the phase change recording method;
Recording the recording information in an area of a phase change recording system other than the pre-pit area;
An information recording medium recording method comprising: An information recording medium reproducing method for reproducing recorded data from the information recording medium recorded by the information recording medium recording method according to claim 2,
The step of continuously reproducing the recording information in the data area according to the lead-in information in the first lead-in information area or the lead-in information in the second lead-in information area
An information recording medium reproducing method comprising:

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