JP2002304816A - Information recording medium and method for reproducing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium from which video contents of a DVD video whose copy is not inhibited can be copied at least once although the contents can be copied in the RTR(Real-Time Recording) mode and the contents cannot be copied in the DVD compatible mode. SOLUTION: An optical disk D includes a lead-in area, which includes a first lead-in information area LI1 provided corresponding to the RTR mode and a second lead-in information area LI2 provided corresponding to the DVD compatible mode, and a data area DA. The area LI1 is an area in which lead-in information corresponding to contents recorded in the data area DA is recorded with a depth d1, and the area LI2 is an area in which the lead-in information except a CSS(Contents Scramble System) key corresponding to the contents recorded in the data area DA and formed by pre-bits with a depth d2 deeper than the depth d1 and the lead-in information except the CSS key is recorded with the depth d1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DVD-Video and a high-density optical disk recorded on the basis of the RTR (Real-Time Recording) standard which is incompatible with DVD-Video and a DVD-Video as a physical standard. Compatible DVD-RW (DVD-RW Re-r
The present invention relates to an information recording medium and an information recording medium reproducing method capable of recording and reproducing contents such as video and audio in accordance with copyright information on a high-density optical disk of the ewritable standard.

[0002]

2. Description of the Related Art In general, in a high-density recording type disc such as a DVD-RW which can be recorded a plurality of times with compatibility with a DVD video, a content protected by copyright and a content not protected by copyright are distinguished. It must be ensured that illegal copying (recording and playback) of the content is not performed without permission. A DVD video is a playback-only disk. Copyright information that prohibits copying of content is recorded in a predetermined area (information area related to copyright protection such as a CSS key) of the disk by CSS (content scramble system). Yes (recording CSS key).
Then, the DVD video reproducing apparatus reads the CSS key, and reproduces the content using the CSS key.

On the other hand, a high-density type disk recording device uses a DVD.
When a high-density disc on which video content is recorded together with a CSS key is played back by a DVD video playback device, the CSS key can be read, so that copy-protected DVD video content can be played back. As a result, a situation occurs in which the copyright of the copy-protected DVD video cannot be protected.

[0004] By the way, although it is not a high-density type disc which can be recorded a plurality of times as described above, a disc which can be recorded only once such as a DVD-R is usually a DVD-R.
At the time of shipment, a special code other than the CSS key is recorded in a predetermined area (CSS area) of the disc where the video CSS key is recorded, and processed so that the CSS key cannot be overwritten later. As a result, the content of DVD video can be converted
When a DVD-R that has not been recorded with the SS key is played back by a DVD video playback device, the CSS key corresponding to the content cannot be read, so that the DVD video content cannot be played back. As a result, the copyright of the copy-protected DVD video can be protected.

[0005]

As described above, the DV
Since the DR can be recorded only once, the CSS key is set to a predetermined value (a value other than a value recognized as a CSS key,
For example, if the data is recorded as all zeros “0” or the like in which data is filled with “0”, a copy-protected DV
It is possible to protect the copyright of the D-video content. On the other hand, in a high-density disc capable of recording a plurality of times, special data (a value other than a value recognized as a CSS key, for example, data of all "0") is stored in its CSS area, such as a DVD-RW. Even if the all-zero “0” or the like is recorded, a regular CSS key corresponding to the content (a copy-permitted CSS)
If the key is overwritten, copy-protected DVD-Video contents can be easily copied and reproduced. As a result, in a high-density disc that can be recorded a plurality of times, a situation arises in which copyright protection of copy-protected DVD-Video contents cannot be performed. In addition, in a high-density disc that can be recorded a plurality of times, it has been required that the content of a DVD video or a self-recorded video whose copying is not prohibited can be reproduced and, if necessary, copied. Furthermore, even when using an optical disc on which content based on the RTR standard which is incompatible with the DVD video standard is used, it is necessary to copy (record and reproduce) the content in accordance with the content of the copyright information. Must.

[0006]

In order to solve the above-mentioned problems, the present invention provides an information recording medium and an information recording medium reproducing method having the following constitution. (1) An information recording medium in which a first lead-in information area and a second lead-in information area are formed in a lead-in area and a data area for recording information is formed. The in-information area is an area formed at a first depth for recording lead-in information such as manufacturing information and start position information of the information, and the second lead-in information area is An information recording medium, wherein lead-in information such as start position information of the information is an area formed by prepits having a second depth greater than the first depth.

(2) An information recording medium in which a first lead-in information area and a second lead-in information area are formed in a lead-in area, and a data area for recording information is formed. 1 lead-in information area includes manufacturing information,
An area formed at a first depth for recording lead-in information such as start position information of the information, and the second lead-in information area includes manufacturing information, start position information of the information, and the like. An information recording medium reproducing method for reproducing information in units of error correction blocks from an information recording medium in which lead-in information is formed by prepits having a second depth greater than the first depth. An information recording medium reproducing method, comprising a step of reproducing information in the data area according to information in one lead-in information area or the second lead-in information area.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an information recording medium and an information recording medium reproducing method according to 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, and FIG. 2 is a view for explaining that data to be recorded on the information recording medium of the present invention is divided into ECC blocks. FIG. 3 is a diagram for explaining recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in sector units, and FIG. 4 is a DVD as an embodiment of the information recording medium of the present invention. FIG. 5 is a diagram showing a physical format of one sector in RW, FIG. 5 is a diagram for explaining a state of lamination of a glass master used in a method of manufacturing a master for producing an information recording medium of the present invention, and FIG. FIG. 7 is a diagram for explaining steps of a method of manufacturing a master for manufacturing an information recording medium of the present invention, and FIG. 8 is a block for explaining a recording / reproducing apparatus for an information recording medium. FIG. 9 is a view for explaining a relationship between data to be recorded in a predetermined area of the information recording medium of the present invention and an ECC block, and FIG. 10 is a view for explaining a lead-in area and a data area of the information recording medium of FIG. 11 and 12 are main flow charts for explaining a recording and reproducing method for recording and reproducing the information recording medium of the present invention, respectively.

In the following description, a DVD-RW is used as an embodiment of the information recording medium of the present invention.
Recording information on the D-RW will be mainly described. However, it goes without saying that the present invention can be applied to other recordable high-density optical discs such as CD-RW, DVD + RW, and next-generation DVDs.

Before describing an embodiment of the present invention, first, lead-in information including, for example, a CSS key, which is information related to copyright protection, is recorded in a lead-in area on a disk, and is read stably. A description will be given of the point that the information can be output. This point is obtained by satisfying all of the following conditions. That is, the lead-in information including the CSS key is written into the first lead-in information area LI1 (the CSS key does not have to be present) in the lead-in area LI at the time of recording the content, and is previously written into the second lead-in information area LI2. Record. First lead-in information area L
If there is a CSS key in I1, it is recorded so that it can be re-recorded. In addition, in the second lead-in information area LI2, information related to copyright protection such as a predetermined value of a CSS key cannot be re-recorded. (For example, information related to copyright protection such as a CSS key is formed by pre-pits).
If a CSS key is present in the first lead-in information area LI1 in the first recording mode during recording or reproduction, lead-in information including the CSS key is recorded, and the first lead-in information area LI1 is recorded in the first reproduction mode. If there is a CSS key recorded in the file, the lead-in information including the CSS key is reproduced. In the second recording mode, the second lead-in information area LI
If there is a recordable area in 2, record lead-in information excluding information related to copyright protection such as a CSS key,
In the second reproduction 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. C recorded in the second lead-in information area LI2 so as not to be re-recordable
Information related to copyright protection such as SS key
It is composed of a pit train of a predetermined amount or more so that information related to copyright protection such as a key cannot be falsified by error correction.

By satisfying all of the above conditions, information related to copyright protection, such as a CSS key, is maintained in a playback compatible device, and even if copy-prohibited contents are recorded in the data area DA by copyright, Content that cannot be played back and that can be copied by permission or copyright free by the data area D
Even if it is recorded in A, it can be reproduced, thereby expanding the market and protecting the copyright.

In other words, the present invention can be said to be a solution to all of the following problems (1) to (4). (1) DVD video is a read-only disc,
The CSS key recorded at a part of the position corresponding to the second lead-in area of 0 and the recorded content are all composed of pits, and the pit depth is determined by a laser having a wavelength of 650 nm. It is about λ / 4. On the other hand, DVD-RW is a phase change recording / reproducing disc,
The recorded or to-be-recorded contents are recorded in the groove area. To optimize the recording / reproducing characteristics, the depth of the groove area with respect to the land area is about λ / 16 (λ / 10 to λ / 18 range). For this reason, when a CSS key in a DVD video is recorded on a DVD-RW, information related to copyright protection such as the CSS key is not composed of pre-pits having a depth of about λ / 16 of the DVD-RW, and It was composed of deep pre-pits of about / 4 to λ / 8. As a result, 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) In a DVD video player,
In the DVD-RW, an information area related to copyright protection such as a deep pre-pit CSS key of about λ / 4 to λ / 8 recorded in a part of the second lead-in area shown in FIG. 10 is satisfactorily reproduced. Even if it can be done, the information related to the copyright protection such as the CSS key is stored in the information recording area (pre-pit area PR) related to the copyright protection such as the CSS key.
If the data amount is small within the range of the correction capability of the ECC block including
The SS key can be read. In view of this, the present invention sets the data amount of information related to copyright protection such as a CSS key composed of pre-pits to a data amount equal to or more than a predetermined value exceeding the range of error correction capability, and sets the information amount related to copyright protection such as the CSS key. If the content cannot be read, the content cannot be reproduced, thereby preventing 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. The information related to the copyright protection is stored in a memory such as a ROM on the recording / reproducing apparatus side, or obtained as an external input signal, and the information related to the copyright protection such as the pre-pitted CSS key and the contents are combined. By composing the data of the ECC block and recording this data in the lead-in information area other than the pre-pit area PR, this ECC block can be reproduced as data including information related to copyright protection such as a CSS key during reproduction. I do.

(4) With the above-mentioned method, it is possible to cope with the reproduction compatibility of the content that does not require copyright protection. Next, for example, DV compatible with DVD video,
In the RTR standard (real-time recording) under discussion in the D forum, for example, contents that do not require copyright protection may be recorded. For this purpose, the present invention stores the above items (1) to (3) in a second lead-in information area LI2, which will be described later, at the physically same position as the DVD-Video lead-in information area, such as a CSS key. Lead-in information such as information related to protection is formed by pre-pits, and lead-in information conforming to the RTR standard is stored in a first lead-in information area LI1 described later.
By recording the lead-in information in the
It is designed to satisfy both standards.

An embodiment of the present invention will be described in the following order. A. “Format of recording format” B. "Embodiment of Disk""Type of information recording device"

A. "Form of Recording Format" First, "form of recording format" will be described.
First, a general physical format when recording information is recorded on a DVD-RW and error correction processing on the recording information (lead-in information) will be described with reference to FIGS.

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

Generally, recording information recorded on a DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. Then, in one data sector 20, from the head thereof, ID information 21 indicating the start position of the data sector 20, and the ID information 2
ID information error correction code (I
ED) 22, 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 a plurality of consecutive data sectors 20.

Next, using this data sector 20, E
Processing for configuring a CC block will be described with reference to FIG. When forming an ECC block using the data sector 20, as shown in FIG. 2B, first, one data sector 20 is divided horizontally into 172 bytes, and each divided data (this Is hereinafter referred to as a data block 33). At this time,
12 rows of data blocks 33 are arranged in the vertical direction.

A 10-byte ECC code (P) is assigned to each of the horizontal data blocks 33 arranged in the vertical direction.
I (Parity In) code 31 to the data block 33
To form one correction block 34. At this stage, 12 correction blocks 34 to which the ECC internal code 31 is added are arranged in the vertical direction. Thereafter, this process is repeated for 16 data sectors for 20 times. As a result, a correction block 34 of 192 rows is obtained.

Next, the correction block 34 of 192 rows is used.
Are arranged in the vertical direction, this time, the correction block 34 of 192 rows is vertically divided from the beginning for each byte, and 16 ECCs are applied to each divided data.
An outer code (PO (Parity Out) code) 32 is added. The ECC outer code 32 is also added to the ECC inner code 31 in the correction block 34.

By the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. At this time, one ECC block 30
The total amount of information contained in is: (172 + 10) bytes × (192 + 16) rows = 378
56 bytes, and the data recorded in the actual data area 24 is 2048 bytes × 16 = 32768 bytes.

The ECC block 3 shown in FIG.
0, 1-byte data is indicated by “D #. *”. For example, “D1.0” indicates 1-byte data arranged in the first row and the zeroth column, and “D190.
“170” indicates 1-byte data arranged in the 190th row and the 170th column. Therefore, the ECC code 31
Are arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.

Further, one correction block 34 is a DVD-R
It is recorded continuously on W. Here, as shown in FIG. 2B, the ECC block 30 is divided into the ECC inner code 31 and ECC.
The configuration including both of the CC outer codes 32 is shown in FIG.
2B, the data arranged in the horizontal (horizontal) direction is corrected by the ECC inner code 31, and the data arranged in the vertical (vertical) direction in FIG. 2B is corrected by the ECC outer code 32. It is. That is, E shown in FIG.
In the CC block 30, it is possible to perform double error correction in the horizontal (horizontal) direction and the vertical (vertical) direction,
The configuration is such that error correction can be performed more strongly than error correction processing used for a conventional CD (Compact Disk) or the like.

More specifically on this point, for example,
One correction block 34 (as described above, one line of ECC
It contains a total of 182 bytes of data including the inner code 31, and is recorded continuously on the DVD-RW. ) Is up to 5 bytes, it can be corrected even if it is destroyed by a flaw or the like. However, if the entire row is destroyed by flaws or the like in a DVD-RW with 6 bytes or more, the ECC internal code 31 can correct it. Disappears. However, even if the entire column is destroyed due to a flaw or the like, when viewed from the vertical direction, only one byte of data is destroyed for the ECC outer code 32 in one column. Therefore, if error correction is performed using the ECC outer code 32 in 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, taking into account the occurrence of acquired scratches, etc., if the row (horizontal) scratches become large,
Needless to say, it also minimizes the next vertical row (horizontal) error. Incidentally, this vertical error can be corrected even if there are 8 vertical columns (16 columns by erasure correction).

Next, the ECC block 3 shown in FIG.
0 is a data sector 20
How it is recorded in the RW will be described with reference to FIG. In FIG. 3, the 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.
The blocks 30 are divided into 16 recording sectors 40 by being arranged in a row in the horizontal direction for each correction block 34 and interleaved. At this time, one recording sector 40 has 2366 bytes (3
7856 bytes ÷ 16), which includes the data sector 20 and the ECC code 31 or ECC.
CC outer code 32 is mixed. However, at the beginning of each recording sector 40, ID information 21 (see FIG. 2A) in the data sector 20 is arranged.

Then, one recording sector 40
As shown in FIGS. 3B and 3C, is divided into data 41 of 91 bytes each, and a sink H is added to each.
After that, the recording sector 40 in this state is 8--
By performing the 16 modulation, one sync frame 42 is formed for each data 41. At this time, one sync frame 42 has a sync H ′ as shown in FIG.
And data 43. The amount of information in one sync frame 42 is 91 bytes × 8 × (16/8) = 1456 bytes.
Information is written to the D-RW disc. At this time, one recording sector 40 includes 26 sync frames 42.

This will be described with reference to FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. That is, the row is composed of 186 bytes of 172 bytes of data, 10 bytes of PI and 4 bytes of sync, and is composed of 13 rows obtained by adding one row of PO to 12 columns. Sync from H0 to H25
26 bytes.

By recording information on a DVD-RW disc by constructing the physical format described above, if the information is reproduced by 8-16 demodulation and deinterleaving (see FIG. 3), the original data can be obtained. Since the ECC block 30 can be restored and the amount of destroyed data blocks can be minimized, information can be reproduced most accurately by performing strong error correction as described above. Copy guard information (information related to copyright protection such as a CSS key) in a 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. "Embodiment of Disk" Next, "Embodiment of Disk" will be described.

As shown in FIGS. 1 and 10, the information recording medium of the present invention is provided with a first recording / reproducing mode (for example, an RTR reproducing mode (reproducing by an RTR reproducing player)). And a second lead-in information area LI2 provided corresponding to a second recording / reproducing mode (for example, a DVD compatible reproduction mode (reproduction by a DVD reproducing player)) in the lead-in area LI. And an information recording medium (optical disc) D having a data area DA for recording content (content such as image and sound), wherein the first lead-in information area LI1
Indicates that the 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.
The second lead-in information area LI2 includes information related to copyright protection related to content (content such as image and sound) recorded in the data area DA and lead-in information (disc of the disc). An information recording medium characterized in that the area is formed by pre-pits having a second depth d2 which is deeper than the first depth d1 (lead-in information such as manufacturing information and content start position information). is there.

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

Also, in the information recording medium of the present invention, the lead-in information includes flag information (information indicating a category such as standard information and version information) indicating the validity of the lead-in information. It is characterized by.

The information recording medium of the present invention is a phase change recording medium, and the second copyright information can be reproduced. In FIG. 1, G indicates a groove area, L indicates a land area, and Le indicates 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 total thickness of the intermediate layer 1C and the first resist layer 1D is: The depth of the recording region R of the optical disc D is the same as that of the second resist layer 1
B and the thickness of the intermediate layer 1C and the thickness of the first resist layer 1D are laminated so that the total thickness is the same as the depth d2 of the pre-pit region PR of the optical disc D, and is exposed at a first light intensity. By irradiating a laser 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.
By irradiating an exposure laser with a second light intensity higher than the first light intensity from above the first resist layer 1D,
The resist layer 1D, the intermediate layer 1C, and the second resist layer 1B are all exposed, and a pre-pit region PR is formed on the glass substrate 1A.
Is a method for producing a master.

More specifically, FIG. 5 shows a state where a signal is to be recorded at a depth λ at the time of manufacturing a master disk D, as described above.
/ 16 (range from λ / 10 to λ / 18), and λ / 4 to λ / 8 of only the pre-pit region PR.
In order to form a pit having a depth as large as possible, the first resist layer 1D and the second resist layer 1B are formed, for example, using THMLIP3.
100 (Tokyo Ohka Kogyo Co., Ltd.) is used. The intermediate layer 1C separating the first resist layer 1D and the second resist layer 1B is made of, for example, a photosensitive resist layer made of polyvinyl alcohol by spin coating or the like.
A is formed on A. 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 wavelength of 351n for recording.
The first resist layer 1D has a low light quantity (weak light quantity) (light sensitivity characteristic 1DD shown in FIG. 6) and the second resist layer 1B has a high light quantity (strong light quantity) with respect to the light intensity of the krypton laser of m. (Photosensitivity characteristics 1BB shown in FIG. 6), and are configured to react with each other, as shown in FIGS. 7 (A) to 7 (C).
In order to form the groove area G and the pre-pit area PR, cutting is performed while switching the light intensity in three stages (strong / normal / weak).

Then, the glass substrate 1A after the recording is developed. A conductive film such as nickel electroless plating is applied to the recording surface in this state (FIG. 7C), and an electrolytic plating of about 250 μm is applied thereto to form a stamper (FIG. 7D).
The figures after this are omitted as a normal process, but the stamper is attached to the mold, the resin such as polycarbonate is injection-molded, the phase change recording film is sputtered, and finally the protective film is attached, the disk is initialized and initialized. Completed as 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 of the pre-pit area PR including the CSS key formed by the pre-pits (see FIG. 9) is set as a value exceeding the correctable range of 16 rows in the ECC block. I do. As described above, one sector is composed of thirteen rows, so that at least two sectors or more, for example, four sectors are used. By setting this value, even if the pre-pit area cannot be read at the time of reproduction, the entire ECC block cannot be read as uncorrectable, so that even if the content itself can be recorded, the content cannot be reproduced. No illegal copying is done.

At the time of normal reproduction, the content scrambled by the CSS is illegally recorded in the data area by the predetermined CSS key, for example, all 0s, and when the content is reproduced, the content is scrambled. Since the CSS key code for deciphering is different from the above-mentioned predetermined CSS key of, for example, all 0, the reproduction is not performed without descrambling. For example, a reproducible signal without scrambling is permitted to be reproduced. You.

Conversely, assuming that this area is, for example, about one sector or less and has an amount in a correctable range, the amount of the correctable range due to an illegal copy is placed on this area. In the case of overwriting, no matter what is written in the CSS key, an illegal signal to be copied is read as a result of correction and has no meaning, regardless of what is written in the CSS key. Therefore, the data amount of the pre-pitched CSS key has an important meaning.

The pre-pitted CSS key is data modulated in accordance with the conventional DVD video specifications, and has a configuration in which the phase is synchronized with the LPP address. In addition, as described above, the pit depth is adjusted only in this area by the servo signal such as the RF reproduction signal and the tracking error signal at the time of reproduction by the DVD video device, or by the tracking error signal and the like at the time of recording this area. Since the servo signal is optimized, recording and reproduction can be performed stably.

C. “Form of Information Recording Device” Further, “Form of Information Recording Device” will be described.

FIG. 10 schematically shows the area from the inner circumference to the outer circumference of the disk. Here, the lead-in area LI
Are located on the inner peripheral side of the data area DA. In the lead-in area LI, disc manufacturing information and content start position information (a CSS key related to copy guard, etc.)
The first lead-in information area LI1 and the second lead-in information area L
There is an I2 region. In the case of this embodiment, each of the two areas LI1 and LI2 is composed of 192 ECC blocks. The lead-in information includes flag information indicating the validity of the lead-in information. The entire area of the first lead-in information area LI1 and the second lead-in information area LI2 is a normal recording area R (phase-change recording layer). Zero (“0”) is recorded as data in an area excluding the two areas LI1 and LI2 from the above-described lead-in area LI.

Hereinafter, information (lead-in information and content) is recorded and reproduced on the DVD-RW in a physical format having the “embodiment of recording format” described specifically with reference to FIGS. Of a recording / reproducing apparatus for the above will be described with reference to FIG. In the following embodiment, the DVD-RW
A pre-pit in which address information and the like on the RW are recorded on the land is formed in advance on an information track on which the recording information is to be recorded. When recording the recording information, the pre-pit is detected in advance to make the DVD-RW DVD-RW for obtaining the above address information and thereby recording information
The upper recording position is detected and recorded.

First, the configuration of a recording / reproducing apparatus for recording / reproducing an information recording medium according to the present invention will be described with reference to FIG.
Here, for example, MPEG2 is adopted as the compression / expansion technique, and a rewritable D is used as an example of the optical disc 1 (D).
VD-RW. Further, in the configuration of FIG. 8, many parts usually 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 4, a signal processor 5, an AV encoder / decoder 6, a driver 7, a servo unit 8, and a system controller 9. , Key input unit 10, output terminal 11, input terminal 12, interface unit 13, track buffer memory 14, memory 15.1 (D) is an optical disk.

In FIG. 8, an optical disk 1 (D) is a recording type optical disk made of, for example, a phase change material. In this embodiment, for example, a so-called DVD-RW disk 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 the continuous 16
One block is composed of a sector, and this one block is a processing unit (ECC block) of the error correction. The optical disc 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 disk 1 chucked by a chucking mechanism. The spindle motor 2 includes an FG generator and a rotation position signal detecting means such as a Hall element. The FG signal from the FG generator and the rotation position signal from the Hall element are fed back to the servo unit 8 via the driver 7 as a rotation 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 controls the objective lens by a biaxial actuator. By driving, focusing and tracking of the laser spot are 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, recording start, reproduction start, recording stop,
Various key operation input information for instructing stop of reproduction and the like can be input by the user.

Interface (ATAPI) 13
Is an interface for transmitting / receiving data to / from a computer or the like.
This is a PI (ATA Packet Interface) interface.

The system controller 9 includes the key input unit 1
As key operation input information from 0, according to various key operation input information such as recording start, reproduction start, recording stop, reproduction stop, etc., the LSI (signal processing unit 5, servo unit 8, The amplifier section 4, the AV encoding / decoding section 6 and the like are controlled. In addition, data is transmitted and received via the interface unit 13. For example, control data for setting a resolution of an image (content) to be recorded, a high-speed scene such as a car race, or recording time is input from the key input unit 10 or the input terminal 12. Also 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, a reproduction start command is issued from the key input unit 10, and the system controller 9 at this time responds to the reproduction start command by an amplifier (to be described later). The control unit 4 controls the servo unit 8 and the driver 7. That is, the optical disk 1
When a signal is reproduced from the system controller 9
First, the optical disk 1 is rotated and a laser spot is irradiated on the optical disk 1, an address signal formed in advance on a signal track on the optical disk 1 is read, and a target sector to be reproduced from the address information is read. The optical head 3 is moved so that a laser spot is located on the target sector (track). After the movement to the target sector is completed, signal reproduction from the target sector is started.

The amplifier section 4 at the time of reproducing the optical disk 1 amplifies the RF signal reproduced from the target sector of the optical disk 1 by the optical head 3 and, based on the RF signal, reproduces a reproduction signal and a tracking and focusing servo signal (tracking servo signal). Error and focus error signals). The amplifier unit 4 further includes an equalizer that optimizes at least 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 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 section 8 receives the speed servo signal from the amplifier section 4 and the focusing and tracking servo signals of the optical head 3, and receives the spindle motor 2
And performs a servo control of a corresponding portion based on each of the servo signals. More specifically, the servo unit 8 controls the PL of the amplifier unit 4.
Based on the speed servo signal generated by the L circuit according to the disk rotation speed and the rotation servo signal from the spindle motor 2, the spindle motor 2 is rotated at a predetermined rotation speed, that is, the optical disk is rotated at a predetermined constant speed. A rotation speed servo control signal for rotating at a linear velocity is generated.

Although details will be described later, in the present embodiment, the optical disc 1 has a recording speed (recording data transfer rate) / reproduction speed (reproduction data transfer rate) higher than the maximum data transfer rate during internal compression / expansion. Record of /
Playback is performed, and therefore, the servo unit 8
Generates a rotation speed servo control signal for rotating the optical disk 1 at a constant linear speed that matches the recording speed / reproduction speed.

The servo section 8 generates an optical head servo control signal for the optical head 3 to accurately perform focusing and tracking on the optical disk 1 based on the focusing and tracking servo signals. The rotation speed servo control signal and the optical head servo control signal 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 reproducing speed (reproducing data transfer rate) of the optical disc 1 is referred to as a reproducing rate.

The driver 7 operates on the basis of each servo control signal from the servo unit 8. The driver 7 drives the spindle motor 2 to rotate in accordance with the rotational speed servo control signal from the servo unit 8, and controls the optical head servo. The two-axis actuator of the optical head 3 is driven according to the control signal.
In the present embodiment, the driver 7 drives the spindle motor 2 in accordance with the rotation speed servo control signal, thereby rotating the optical disc 1 at a predetermined linear speed.
The driver 7 drives the biaxial actuator of the optical head 3 according to the optical head servo control signal, so that focusing and tracking of the laser spot on the optical disk are performed.

The signal processing unit 5 when reproducing the optical disk 1
The reproduction signal supplied from the amplifier unit 4 is A / D (analog / digital) converted, synchronization is detected from the digital signal obtained by the A / D conversion, and a so-called EFM + signal applied to the digital signal is converted. (8-1
(6 modulation signals) to NRZ (Non Return to Zero) data, and further performs error correction processing to obtain address data and reproduction data of a sector on the optical disk 1. The address data and the synchronization signal obtained by the signal processing unit 5 are sent to the system controller 9. In addition,
The details of the error correction processing performed by the signal processing unit 5 will be described later.

Here, the reproduced data is, for example, MPEG
If the data is compression-encoded at a variable transfer rate, the optical disc device of the present embodiment stores the data in a D-RAM (track buffer memory 1
4), the writing / reading of the track buffer memory 14 is controlled to absorb the time variation of the variable transfer rate of the reproduced data. Note that the track buffer memory used in the present embodiment is a buffer memory for temporarily storing compressed data, for example, a buffer memory for absorbing a variable transfer rate generally provided in DVD. And a buffer memory used for MPEG encoding and decoding. The management of the storage capacity and storage area of the track buffer memory 14 and the write / read control are performed by the system controller 9 via the signal processing unit 5, for example.

The AV encoding / decoding section 6 at the time of reproducing the optical disk 1 converts the reproduction data supplied from the track buffer memory 14 into data obtained by compression-encoding, for example, MPEG2 and multiplexing audio data and video data. , The multiplexed compressed audio data and compressed video data are separated, and
The signal is decompressed and decoded at G2, and is further D / A (digital / analog) converted and output from the output terminal 11 as an audio signal and a video signal. The video signal output from the output terminal 11 is supplied to an NTSC (National
(Television System Committee) Processed by an encoder or the like and displayed on a monitor device, and the audio signal is sent to a speaker or the like (not shown) and emitted. Note that the speed of the decompression decoding by the AV encoding / decoding unit 6 at the time of this reproduction (the data transfer rate at the time of decompression decoding; hereinafter, referred to as the decompression rate) is the recording speed set at the time of recording, which will be described later. The expansion rate is set according to the mode. In other words, the AV encoding / decoding unit 6 is capable of performing expansion / decoding processing according to a plurality of expansion rates, determines the expansion rate in accordance with a recording mode set at the time of recording, and determines the expansion rate 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 out when the optical disc 1 is reproduced and sent to the system controller 9. The decompression rate of the AV encoding / decoding section 6 is set. The D / A conversion can be performed outside the AV encoding / decoding unit 6.

On the other hand, when recording a signal on the optical disk 1, for example, a recording start command is issued from the key input unit 10, and the system controller 9 responds to the recording start command by the amplifier unit 4 and the servo unit 8. And the driver 7. 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 pre-pit on a signal track on the optical disc 1 is recorded. Is read, a target sector (track) to be recorded is found from the address information, and the optical head 3 is moved so that a 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.

From the output terminal 11, audio and video signals to be recorded are input, and these signals are
It is sent to the encoding / decoding unit 6. At the time of recording on the optical disc, the AV encoding / decoding unit 6 A / D converts the audio signal and the video signal, and converts the audio data and the video data into MPEG2 compression codes at a speed corresponding to a recording mode described later. And multiplexes them and sends them to the signal processing unit 5. Hereinafter, the speed of compression encoding (data transfer rate at the time of compression encoding) in the AV encoding / decoding unit 6 is 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.

It is to be noted that a memory of 64 Mbits DR is used.
The AM 15 is a memory for temporarily storing data when the AV encoding / decoding unit 6 performs compression / expansion. Also, the A / D conversion can be performed outside the AV encoding / decoding unit 6.

The apparatus of this embodiment can record and reproduce still image information and data such as program files on a computer in addition to video and audio information. In this case, data such as still image information and a program file is supplied from the interface unit 13, and the data is sent to the signal processing unit 5 via the system controller 9.

At the time of recording on the optical disk, the signal processing section 5 adds an error correction code to the compressed data from the AV encoding / decoding section 6 or data such as a program file via the system controller 9 to add an NRZ code. And EFM + encoding, and further adds a synchronization signal supplied from the system controller 9 to generate recording data.

Here, the recording data is temporarily stored in the track buffer memory 7 and then read from the track buffer memory 7 at a reading rate corresponding to the recording rate on the optical disk 1. In addition,
The details of the management of the storage capacity and storage area of the track buffer memory 7 and the write / read control during this recording will be described later. The recording data read out from the track buffer memory 7 is subjected to a predetermined modulation process in the signal processing unit 5 and sent to the amplifier unit 3 as a recording signal. Track).

At this time, the system controller 9
A / D (analog / digital) converts and measures the jitter value from the amplifier unit 4, and changes the waveform correction amount in the amplifier unit 4 during recording according to the measured jitter value and asymmetry value. That is, when recording a signal on the optical disk 1, the amplifier unit 4 corrects the waveform of the signal from the signal processing unit 5 and sends the signal whose waveform has been corrected to the laser drive circuit of the optical head 4.

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

The optical disc 1 of the present embodiment is a DVD-RW disc that is compatible with content recorded on DVD video, DVD audio, DVD-ROM, etc., and conforms to the recordable DVD standard. . This DVD
Not only in the case of -RW, but also on write-once or rewritable optical disks, usually, the address of the sector is recorded or formed on the disk in advance in order to enable address control during recording. However, in the conventional optical disc, the address recording is performed by wobbling the groove according to the frequency modulated based on the address data.
In the case of W, in order to enable higher-speed and higher-density recording, together with the wobbling frequency signal of the groove,
A so-called LPP (land pre-pit) address system for forming predetermined pits on land portions on an optical disk is adopted.

Here, when data is actually recorded on the optical disk 1, a sector address (hereinafter simply referred to as an LPP address) based on an LPP address which is recorded in advance on the optical disk 1 and is also a recording timing signal is used. Generally, a sector address (hereinafter, referred to as a data address) included in recording data to be actually recorded is made to match. As an example of data recording in which the LPP address and the data address match in this way, for example, there is a case where data reproduced from a normal DVD is entirely recorded on a DVD-RW. In this case, data is continuously recorded on the DVD-RW disc, and therefore, the relationship between the LPP address and the data address can be made to match.

Next, a second lead-in area including a copy guard area (information area related to copyright protection (recording area for CSS key data, etc.) and pre-pit area PR) which will be described later with reference to FIG. The operation of recording and reproduction to and from the DVD will be described below. This apparatus is configured such that it is possible to select whether to record in, for example, the RTR recording mode or the DVD-video compatible recording mode by, for example, determining a key input and the system controller 9 at the time of recording (FIG. 11 and FIG. 12). This selection may be made, for example, in such a manner that it is 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 written in the first lead-in information area LI1. Including (including a CSS key as described later) lead-in information is recorded (steps S1 and S2). On the other hand, RT
In the case of a DVD compatible recording mode instead of the R recording mode, contents are recorded in the data area DA,
In the case of the ECC block configuration of Example 1 in FIG. 9 (8 Kbytes of 4 sectors are composed of pre-pits), lead-in information (1 ECC) excluding information related to copyright protection such as a pre-pit CSS key is stored in the second lead-in information area LI2. Since the block is 32 Kbytes, 24 Kbytes (= 32−
8)) is recorded (steps S3 and S4). FIG.
ECC block configuration of example 2 (32 of one ECC block)
If the K bytes are composed of pre-pits), the process proceeds to the next step without recording.

In the RTR recording mode, content and lead-in information can be recorded in real time.
Not compatible with DVD video. On the other hand, DVD
In the compatible recording mode, content with complicated editing cannot be recorded in real time (because the CSS key is formed so as not to be re-recordable), but it is compatible with DVD video and is currently available on the market. DVD on the market
It can be played back with a video player. As described above, since the recording modes to be used have their respective advantages and disadvantages, the recording modes can be selected according to the environment at the time of recording.

In FIG. 11, after the recording operation is started, “RTR recording” is performed in step S1, “record on first lead-in” is performed in step S2, and “DVD is recorded” in step S3.
The flow of “compatible recording” and “record on second lead-in” in step S4 are shown, but the present invention is not limited to this. After starting the recording operation, “DVD compatible recording” is performed in step S1 and “second compatible recording” is performed in step S2. Not recorded in the lead-in "or not recorded,
“RTR recording” is performed in step S3, and “first recording” is performed in step S4.
Of the lead-in.

Next, the reproducing operation will be described. In the present invention, there are three types of DVD disks according to the present invention that can be regarded as having substantially the same physical characteristics at the time of starting reproduction. At the physical radius position in FIG. 10, the first DVD video already sold has no first lead-in information area, only a second lead-in information area including a CSS key, and a second DVD-Video. 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. This is a disc having second lead-in information including information about copyright protection such as a first lead-in information and a predetermined value of a CSS key. As shown in FIG. 12, first, when the first lead-in information area LI1 is read and information is recorded, the reproduction operation is performed using a flag of the recorded lead-in information (disc type and version information (media type), as shown in FIG. 12). ), If it is detected that the lead-in information is valid as a media type, the first
Including the CSS key of the lead-in information area LI1 (CS
(It is not necessary to have the S key.) The lead-in information is reproduced,
According to the reproduced lead-in information, the data area DA
(For example, RT)
(In the R playback mode) (steps S5, S6, S
7). On the other hand, by referring to the flag of the first lead-in information area LI1, it is detected that this lead-in information is not valid or that the first lead-in information area is also necessary (or if the signal cannot be reproduced and the first lead-in information area cannot be reproduced). Is detected), and by referring to the flag of the second lead-in information area LI2, whether the lead-in information is valid (detecting whether the signal can be reproduced) is detected. The lead-in information including the CSS key recorded in the pre-pits of the second lead-in information area LI2 is reproduced, and the reproduction processing of the content recorded in the data area DA is performed according to the reproduced lead-in information (for example, DVD). In compatible playback mode)
(Steps S8 and S9). Here, the playback device and C
Depending on the relationship with the lead-in information including the SS key, a process for stopping the reproduction process is performed.

In FIG. 12, after the reproduction operation is started, "first lead-in reproduction" is performed in step S5, "valid" is performed in step S6, "reproduction is performed according to first lead-in" in step S7, and step S8 is performed. Shows a flow of "second lead-in reproduction" and step S9 of "reproduction according to second lead-in". However, the present invention is not limited to this. 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 reproduced by the above-described method, a predetermined value of information relating to copyright protection can be read, and the reproduction method as described above can be used. Maintain mutual compatibility and enable copyright protection during playback. Alternatively, depending on the reproducing apparatus, an abnormal operation that occurs because information in the second lead-in area cannot be reproduced conventionally can be prevented.

In the present embodiment, 16 consecutive data sectors (32 kB) in the data area DA are used.
yte) constitutes one ECC block.
A block is the minimum basic unit for recording and reproduction. Each data sector is composed of a sync frame having 26 syncs recorded in synchronization with an address composed of LPP and a sync timing signal for recording. Further, in the DVD-RW, sector addresses are formed at predetermined intervals.

More specifically, as shown in FIGS. 9B and 9C, a copy guard area of the second lead-in area (an information area related to copyright protection in which a predetermined CSS key value and the like are recorded). 9 is different from Example 1 in which the pre-pit area PR of FIG.
As shown in (F) and (G), a pre-pit area PR in a copy guard area (information area related to copyright protection in which a predetermined CSS key value or the like is recorded) in the second lead-in area.
Will be described in an example 2 in which ECC blocks are arranged in advance in all 16 sectors. When recording in this ECC block area in Example 1, the system controller 9 uses the pre-pit data of four sectors stored in the system ROM and the EC data of twelve other sectors.
For the data to be recorded in the C block, correction additional data (PI, PO) of the ECC block is generated using the track buffer memory 14 described above. Then, data from the first part of the generated data to the pre-pit start position is recorded with reference to the timing of the LPP sync signal (the timing signal shown in FIG. 9B). At the start timing of the pre-pit area PR, the recording is temporarily stopped and the reproduction state is set. Next, at the LPP sync signal timing at the end of the pre-pit, the ECC
Recording is performed from the recording signal at the end position of the pre-pit of the block. Then, the recording of the predetermined ECC block ends. In Example 2, since all of the ECC blocks are configured as the pre-pit area PR, there is no need to record.

On the other hand, at the time of reproduction by the DVD video reproducing apparatus, the second lead-in information area LI2 is reproduced, and reproduction is performed based on this information. Here, the playback device and CSS
Depending on the relationship with the lead-in information including the key, a process for stopping the reproduction process is performed. In the case of reproduction by the present recording / reproduction device (see FIG. 9), first, the first lead-in information area LI
1 if there is no lead-in information as a result of the reproduction, or if the flag (disc type and version information (media type)) of the lead-in information is invalid, or if the lead-in information is In addition to the above, information relating to copyright protection of the second lead-in LI2 area (a predetermined CSS key such as all 0s and / or copyright management information proposed as a copy protection method, etc.)
When the reading of the second lead-in LI2 area is required, the second lead-in LI2 area is reproduced. Then, reproduction is performed based on this information.
Conversely, the first lead-in information area LI1 is reproduced, and if there is lead-in information as a result of the reproduction, and if the flag of the lead-in information is valid, reproduction is performed based on this information. . In the case of the example 1, one EC
The C block will have two linkings (joints). At the time of reproduction, for example, two sync frames * due to amplitude fluctuation at the joint, phase shift of the recording signal, etc.
Although about two data areas may be destroyed, as described above, since errors are in the range of the correction capability, no error occurs at the time of reproduction, and copy guard data composed of the pre-pits (for copyright protection). Information) is stable,
Can be regenerated.

As described above, in the reproducing apparatus, the contents copied illegally based on the information on the copyright protection such as the CSS key recorded by the pre-pits are used as the C content.
Because information about copyright protection such as SS key is different,
Reproduction is not possible, and on the other hand, contents such as personal data photographed by a video camera or the like can be reproduced on a DVD video or the like by using information on copyright protection such as the CSS key. Note that the disc structure, the manufacturing method, and the contents of the recording / reproducing procedure are merely examples, and are not limited to this range. Further, in the above-described embodiment of the present invention, the explanation has been made using DVD video, but the same applies to DVD audio, and it goes without saying that the present invention can be applied to a medium other than DVD that can record at high density. The pit depth of the pre-pit area is
In this embodiment, the depths are physically different (d1 <d2).
Should be substantially equivalent to a depth of about λ / 4 to λ / 8. In the present embodiment, the depth of the groove area for recording the first lead-in and data is as follows.
Physically, the depth is centered on λ / 16 and substantially λ / 10
What is necessary is just to correspond to a depth of about λ / 18. In the above-described embodiment, the first lead-in information area L
A description has been given of a state in which lead-in information including information (CSS key) relating to copyright protection is recorded in I1. However, the present invention is not limited to this. Information (CSS
Of course, the same can be applied to a state where lead-in information that does not include the key is recorded.

[0085]

According to the present invention having the above structure,
In a recording mode related to the first lead-in information area, for example, in the RTR recording mode, self-recorded content can be copied (recorded and reproduced), and in a recording mode related to the second lead-in information area. For example, in a DVD compatible recording mode, copy-protected DVD-Video contents cannot be copied (even if they are recorded, they cannot be reproduced due to inconsistency in information related to copyright protection such as a CSS key), but copying is not prohibited. When a content corresponding to the copyright information is recorded, it is possible to provide an information recording medium and an information recording medium reproducing method that can be reproduced.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view for explaining one embodiment of an information recording medium of the present invention.

FIG. 2 shows data recorded on an information recording medium according to the present invention as EC.
FIG. 4 is a diagram for explaining that a C block is formed.

FIG. 3 is a diagram for describing recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in sector units.

FIG. 4 shows a DVD as an embodiment of the information recording medium of the present invention.
It is a figure which shows the physical format of one sector in -RW.

FIG. 5 is a diagram for explaining a laminated state of a glass master used in a master manufacturing method for manufacturing an information recording medium according to the present invention.

FIG. 6 is a light intensity versus sensitivity characteristic diagram of a resist layer laminated on a glass master.

FIG. 7 is a diagram for explaining steps of a master production method for producing an information recording medium according to the present invention.

FIG. 8 is a block diagram illustrating an information recording medium recording / reproducing apparatus.

FIG. 9 is a diagram for explaining the relationship between data recorded in a predetermined area of the information recording medium of the present invention and an ECC block.

FIG. 10 is a diagram for explaining a lead-in area and a data area of the information recording medium of the present invention.

FIG. 11 is a main flowchart for explaining a recording method for recording an information recording medium of the present invention.

FIG. 12 is a main flowchart for explaining a reproducing method for reproducing the information recording medium of the present invention.

[Explanation of symbols]

 1, D disk, optical disk (information recording medium) DA data area d1 first depth d2 second depth PR prepit area R recording area LI lead-in area LI1 first lead-in information area LI2 second lead-in Information area

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 27/00 G11B 27/00 D H04N 5/85 H04N 5/85 Z 5/91 5/91 PF term (Reference) 5C052 AA04 AB08 AB09 CC11 CC12 DD04 EE10 5C053 FA24 GA11 GB05 GB15 GB38 JA30 5D044 AB07 BC03 CC06 DE50 DE54 EF05 FG18 GK12 HL08 5D090 AA01 BB02 CC04 GG33 GG36 5D110 AA15 AA29 BB01 DC04

Claims (2)

[Claims] 1. An information recording medium in which a first lead-in information area and a second lead-in information area are formed in a lead-in area, and a data area for recording information is formed. Is a region formed at a first depth for recording lead-in information such as manufacturing information and start position information of the information, and the second lead-in information region is An information recording medium, wherein lead-in information such as manufacturing information and start position information of the information is an area formed by prepits having a second depth greater than the first depth. 2. An information recording medium in which a first lead-in information area and a second lead-in information area are formed in a lead-in area and a data area for recording information is formed. Is a region formed at a first depth to record lead-in information such as manufacturing information and start position information of the information, and the second lead-in information region is Information is reproduced in units of error correction blocks from an information recording medium in which lead-in information such as manufacturing information and start position information of the information is an area formed by prepits having a second depth greater than the first depth. An information recording medium reproducing method, comprising: reproducing information in the data area according to information in the first lead-in information area or the second lead-in information area. Recording medium playback method.