JP2002208137A - Information recording medium, and method for reproducing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium incapable of copying the content of a DVD video inhibited for copying, but capable of copying, at least once, the content of a DVD video uninhibited for copying or a self-recorded video. SOLUTION: The information recording medium for recording/reproducing information with an error correction block set as a unit for recording/ reproducing is provided with a recording area, in which the error correction block for recording information is set as a unit for recording/reproducing, and an error correction block, in which when the error correction capability of the error correction block n bytes as an information quantity, a prepit area having a prepit formed for reproducing the error correction block as a unit for recording/reproducing is recorded as information having an information quantity equal to/more than the n bytes of the specified error correction block unit, and less than one error correction block.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording apparatus which is a high-density recording type disc on which copying prohibited information cannot be copied, but copying not prohibited information can be copied at least once. The present invention relates to a medium and an information recording medium reproducing method.

[0002]

2. Description of the Related Art In general, in a high-density recording type disc such as a DVD-RW (Reritable) which can be recorded a plurality of times with compatibility with DVD video, contents protected by copyright and contents not protected by copyright are distinguished. We must ensure that content is not illegally copied. DVD-Video is a playback-only disc, and the copyright information that prohibits copying of the content is CSS
The content is recorded in a predetermined area (CSS area) of the disc (contents scramble system) (recording of a 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, in the case of a disc which is not a high-density disc which can be recorded a plurality of times but which can be recorded only once, such as a DVD-R (Rewritable), a DVD video CSS key is normally recorded. In a predetermined area (CSS area) of the disc to be
A special code other than the S key is recorded so that the CSS key cannot be overwritten later. As a result, DVD-Video contents in which DVD video contents are not recorded together with a CSS key in a high-density type disc recording apparatus are recorded.
When R is reproduced by a DVD video reproducing device, CS
Since the S key cannot be read, the DVD video content cannot be reproduced. 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, if the CSS key cannot be read, it is possible to protect the copyright of the copy-protected DVD-Video contents. On the other hand, in the above-described high-density type disc that can be recorded a plurality of times, even if special data (a special code other than the CSS key) is recorded in the CSS area, such as a DVD-RW, If a regular CSS key (copy-permitted CSS key) is overwritten, copy-protected DVD-Video contents can be easily reproduced and illegally copied. As a result, in a high-density disc that can be recorded a plurality of times, a situation 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 must be able to be reproduced and copied.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an error correction block for recording the information in an information recording medium for recording and reproducing information using the error correction block as a unit of recording and reproduction. Assuming that the error correction capability of the error correction block unit is n bytes as the information amount, a prepit area in which a prepit that can reproduce an error correction block as a unit of recording and reproduction is formed. An information recording medium and an information recording medium reproducing method, comprising: an error correction block recorded as information having an information amount of n bytes or more in the predetermined error correction block unit and less than one error correction block. The purpose is to provide. Thus, according to the present invention, even if illegally copying DVD-Video content whose copying is prohibited, the copyright information relating to the content cannot be recorded, so that the content cannot be reproduced and the copying is impossible. As a result, the copyright of the content can be reliably protected. Also, for example, the content of a DVD video or a self-recorded video whose copy is not prohibited, for example, the copy of which is not prohibited, can be recorded together with the copyright information related to the content, so that the content can be reproduced, and at least one copy thereof can be made. It is possible to do it.

[0007]

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 constitutions (1) and (2).

(1) In an information recording medium for recording and reproducing information using an error correction block as a unit of recording and reproduction, a recording area configured as an error correction block for recording the information as a unit of recording and reproduction; Assuming that the error correction capability of a unit is n bytes as an information amount, the prepit area in which a prepit that can reproduce an error correction block as a unit for recording and reproduction is equal to or more than n bytes of the predetermined error correction block unit and one error An information recording medium having an error correction block recorded as information having an information amount less than a correction block. (2) An information recording medium for recording and reproducing information using an error correction block as a unit for recording and reproduction, a recording area configured as an error correction block for recording the information as a unit for recording and reproduction, and the error correction block unit Assuming that the error correction capability of the memory is n bytes as the information amount, the pre-pit area in which the pre-pit which can reproduce the error correction block as a unit of recording and reproduction is equal to or more than the predetermined error correction block unit of n bytes and one error correction block In an information recording medium reproducing method for reproducing information in units of error correction blocks from an information recording medium having an error correction block recorded as information having an information amount less than a block, the recording area up to a boundary portion of the pre-pit area And error correction blocks comprising the pre-pit area as continuous correction block information. Information recording medium reproducing method characterized by performing live.

[0009]

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, 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, and FIG. FIG. 4 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. FIG. 4 is a diagram showing a DVD-RW as an embodiment of the information recording medium of the present invention. FIG. 5 is a view showing a physical format of one sector, FIG. 5 is a view for explaining a laminated state of a glass master used in a method of manufacturing an information recording medium master related to the present invention, and FIG. 6 is a resist layer laminated on the glass master. FIG. 7 is a diagram for explaining steps of a method of manufacturing an information recording medium master related to the present invention, and FIG. 8 is a block for explaining an information recording medium recording / reproducing apparatus related to the present invention. 9 is a diagram for explaining the relationship between the data and the ECC block recorded in a predetermined area of the information recording medium of the present invention. In the following description, as an embodiment of the information recording medium of the present invention, DV
Recording of information on a DVD-RW using a D-RW will be mainly described.
It goes without saying that the present invention can also be applied to high-density optical disks such as W, DVD + RW and next-generation DVDs.

First, before describing the embodiment of the present invention, copy guard data (copy-inhibited CSS key = C
A description will be given of how to record SS data) on a disk and read it out stably. This point is obtained by satisfying all of the following conditions.
That is, the CSS data is recorded so as not to be erased.
The data amount is set to a predetermined amount or more so that the CSS data cannot be falsified by correction. It is configured so that CSS data can be read. At the time of recording, the CSS data is recorded except for the CSS data. By satisfying all of the above conditions, in the DVD-RW player, the copy-protected (copy prohibited) DVD-Video contents cannot be illegally copied, while the copy-free (copy prohibited) DVDs cannot be copied. In the case of video or self-recorded video content, a copy-protected DV
This enables promotion of copyright protection of D-video contents.

In other words, the present invention can be said to be a solution to all of the following problems (1) to (3). (1) DVD-Video is a read-only disc, CS
The S data and recorded content are all composed of pits, and the pit depth is about λ / 4 for a 650 nm laser. On the other hand, a DVD-RW is a phase-change recording / reproducing disc, and recorded or to-be-recorded contents are recorded in a groove area. Is about λ / 16. For this reason, the CSS data in the DVD video is
In the case of recording on a DVD-RW, the CSS data was not composed of DVD-RW pre-pits having a depth of about λ / 16, but composed of pre-pits having a depth of about λ / 4 to λ / 8. Thus, the DVD video player can satisfactorily reproduce CSS data of deep pre-pits of about λ / 4 to λ / 8 in the DVD-RW.

(2) In a DVD video player,
Even if CSS data of deep pre-pits of about λ / 4 to λ / 8 in a DVD-RW can be satisfactorily reproduced,
If the CSS data has a small data amount within the range of the correction capability of the ECC block including the CSS data recording area (pre-pit area), an error is corrected during reproduction. Therefore, the present invention provides a CS composed of pre-pits.
The data amount of the S data is set to a predetermined amount or more exceeding the range of the error correction capability, and when the CSS data cannot be read, the content cannot be reproduced, thereby preventing illegal copying of the content.

(3) Next, at the time of recording, the CSS data recorded in the pre-pit area is held in a memory such as a ROM of the recording / reproducing apparatus, or obtained as an external input signal, and The data of the ECC block is composed of the CSS data and the data of the content, and this data is recorded in a recording area other than the pre-pit area, so that the ECC block can be reproduced as data including CSS data at the time of reproduction.

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

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

First, an error correction process in the DVD-RW according to the present 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 code) is assigned to each of the horizontal data blocks 33 arranged in the vertical direction.
I (Pality 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 above-mentioned 192 line correction block 34
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 (Pality 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
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 and demodulated and deinterleaved by 8-16 (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. The copy guard information is recorded as a part of data of such an ECC block.

B. "Embodiment of Disk" Next, "Embodiment of Disk" will be described.

The information recording medium of the present invention is shown in FIGS.
As shown in (C), the first information (copy-protected DVD-Video content) cannot be copied, but the second information (copy-protected DVD video or self-recorded video). Is an information recording medium (optical disc) D that can be copied at least once, and is an area for recording the first and second information, respectively, and has a first depth d1. Region R and copyright information indicating copy prohibition for the first information and copying at least once for the second information (for example, unlimited copying permitted, copying allowed once, A pre-pit area in which a pre-pit of a second depth d2 which is larger than the first depth d1 is formed (in the CSS area pr) and in which an area for recording a CSS key such as two-time copying is allowed. An information recording medium characterized by comprising a R. In FIG. 1, Le denotes the irradiation direction of the recording / reproducing laser beam. In the information recording medium of the present invention, the copyright information on the copy of the second information recorded in the pre-pit area PR can be reproduced.

Further, the information recording medium of the present invention has the structure shown in FIG.
As shown in FIG. 7 (C), the first information (copy-protected DVD-Video content) cannot be copied, but the second information (DVD whose copy is not prohibited).
Video or self-recorded video content)
Is an information recording medium (optical disk) D that can be copied at least once, and includes a first recording area R for recording the second information in units of predetermined error correction blocks using a first recording method. If the error correction capability of the predetermined error correction block unit is n bytes as the information amount, the first information indicates copy prohibition and the second information indicates
The copyright information indicating that copying is possible at least once is recorded as information having an information amount of n bytes or more in the predetermined error correction block unit using the second recording method. Recording area (pre-pit area) PR
An information recording medium comprising: Furthermore, in the information recording medium of the present invention, the first recording method is phase change recording, and the second recording method is pre-pit recording.

Hereinafter, the manufacturing process of the information recording medium of the present invention having the above-described configuration will be described. As shown in FIGS. 5 to 7, the information recording medium master manufacturing method of the present invention is an information recording medium master manufacturing method for manufacturing the above-described master of the information recording medium D. , A photosensitive film (second resist layer) 1B, an intermediate layer 1C, and a second photosensitive film (first resist layer) 1D are sequentially laminated, and the thickness of the intermediate layer 1C and the second photosensitive The total thickness of the recording film R and the intermediate layer 1C is the same as the first depth d1 of the recording region R of the information recording medium D. And the thickness of the second photosensitive film 1D are equal to the thickness of the information recording medium D.
Are laminated so as to have the same depth as the second depth d2 of the pre-pit region PR, and irradiating an exposure laser at a first light intensity from above the second photosensitive film 1D,
The second photosensitive film 1D and the intermediate layer 1C are exposed to form the recording region R at a first depth d1 on the glass substrate 1A. The exposure laser is applied to the second photosensitive film 1 with a strong second light intensity.
D, the second photosensitive film 1D, the intermediate layer 1C, and the first photosensitive film 1B are all exposed to light, and a second D
2. An information recording medium master manufacturing method, wherein the pre-pit region PR is formed in step 2.

As shown in FIGS. 5 to 7, the method for manufacturing an information recording medium master related to the present invention is a method for manufacturing an information recording medium master for manufacturing an information recording medium D as described above. A first photosensitive film (second resist layer) 1B, an intermediate layer 1C, a second photosensitive film (first resist layer) 1D are sequentially laminated on a substrate 1A, and the intermediate layer 1C
And the thickness of the second photosensitive film 1D are the same as the depth of the first recording region R of the information recording medium D, and the first photosensitive film 1D has the same thickness. The total thickness of the thickness of the film 1B and the intermediate layer 1C and the thickness of the second photosensitive film 1D is equal to the second thickness of the information recording medium D.
The recording region (pre-pit region) PR is stacked so as to have the same depth d2, and the exposure laser is irradiated at a first light intensity from above the second photosensitive film 1D, thereby forming the second region. And exposing the second photosensitive film 1D and the intermediate layer 1C to form the first recording region R on the glass substrate 1A, and the second light intensity higher than the first light intensity. Irradiates the exposure laser from above the second photosensitive film 1D to thereby obtain the second photosensitive film 1D.
And the intermediate layer 1C and the first photosensitive film 1B are all exposed to form the second recording area PR on the glass substrate 1A. is there.

More specifically, FIG. 5 shows a state where a signal is to be recorded at a depth λ, as described above, when a master disk D is manufactured.
To form a groove area G of about / 16 and a deep pit of about λ / 4 to λ / 8 of only the pre-pit area PR, the first resist layer 1D and the second resist layer 1B
For example, THMR-IP3100 (Tokyo Ohka Kogyo Co., Ltd.)
Is used. The intermediate layer 1C separating the first resist layer 1D and the second resist layer 1B is formed, for example, by forming a photosensitive resist layer made of polyvinyl alcohol on the glass substrate 1A by spin coating or the like. It becomes. Thus, the second resist layer 1, the intermediate layer 1C, and the first resist layer 1D are sequentially laminated on the glass substrate 1A. The first resist layer 1D and the second resist layer 1B have a low light amount (weak light amount) with respect to the light intensity of the krypton laser having a wavelength of 351 nm for recording (see FIG. 6). The light sensitivity characteristic 1DD shown in FIG. 7) and the second resist layer 1B are configured to react with a high light amount (strong light amount) (light sensitivity characteristic 1BB shown in FIG. 6).
As shown in (A) to (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, and 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. 7 (C)), and electrolytic plating of about 250 nm is applied thereto to form a stamper (FIG. 7 (D)).
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

Here, the length of the pre-pit area PR including the CSS data (see FIG. 9) is set as a value exceeding the correctable range of 16 rows in the ECC block. 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 the disk cannot be reproduced and an illegal copy is reproduced. Absent.

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

Conversely, if this area is, for example, about one sector or less and has an amount within a range that can be corrected, if this area is overwritten due to illegal copying, it will be used as an ECC block. No matter what is written in this CSS data, an illegal signal to be copied is read as a result of the correction and is meaningless. Therefore, the amount of pre-pits has an important meaning.

The pre-pitched CSS data is data modulated according to the conventional DVD video specification, 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 / Reproducing Apparatus” Further, “Form of the information recording apparatus” will be described. As shown in FIG. 8, the information recording medium recording / reproducing apparatus related to the present invention is an information recording medium recording / reproducing apparatus for recording / reproducing the second information on / from the information recording medium D, A management unit (system controller) 9 for managing a sector address of the recording area R and a recording timing for recording in the recording area R based on the sector address read from D;
Storage means (memory) 14 for storing a sector address of R and copyright information indicating that copying is prohibited for the first information and that copying is permitted at least once for the second information; Information generation means (signal processing unit) 5 for sequentially generating error correction block information in predetermined error correction units based on recording information including the copyright information and the second information; A recording unit (optical head) 3 for recording the corrected block information in the recording area at the recording timing; and the recording area R based on the copyright information reproduced from the pre-pit area PR.
Reproducing means (AV encoding / decoding unit) 6 for sequentially reading out the error correction block information recorded in the second section and correcting the error in a predetermined error correction unit to reproduce the second information. An information recording medium recording / reproducing apparatus characterized in that:

As shown in FIG. 8, the information recording medium recording / reproducing apparatus according to the present invention is an information recording medium recording / reproducing apparatus for recording / reproducing the second information on / from the information recording medium D. A management means (system controller) 9 for managing a sector address of the first recording area R and a recording timing for recording in the first recording area R based on a sector address read from the information recording medium D; The second recording area (pre-pit area) PR
Indicates copy prohibition for the sector address and the first information, and at least 1 for the second information.
An error correction block in a predetermined error correction unit based on storage means (memory) 14 storing copyright information indicating that copying is possible, and recording information including the copyright information and the second information. An information generating unit (signal processing unit) 5 for sequentially generating information; a recording unit (optical head) 3 for recording a series of the error correction block information in the first recording area R at the recording timing; The error correction block information recorded in the first recording area R is sequentially read based on the copyright information reproduced from the recording area (pre-pit area) PR, and error correction is performed in a predetermined error correction unit. Thus, the information recording medium recording / reproducing apparatus further comprises a reproducing means (AV encoding / decoding unit) 6 for reproducing the second information.

Hereinafter, a recording related to the present invention for recording information on a DVD-RW in a physical format having the "embodiment of a recording format" described specifically with reference to FIGS. The mode of the playback device will be described with reference to FIG. In the following embodiment, the DVD-
In the RW, pre-pits in which address information and the like on the DVD-RW are recorded on lands are formed in advance on information tracks where recording information is to be recorded, and when recording information is recorded, the pre-pits are detected in advance. As a result, address information on the DVD-RW is obtained, and a recording position on the DVD-RW where the recording information is recorded is detected and recorded. First, the configuration of a recording / reproducing apparatus related to the present invention will be described with reference to FIG. Here, a rewritable DVD-RW is cited as an example of the optical disk 1 (D), employing, for example, MPEG2 as the compression / expansion technique. 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 the present 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 one block is composed of continuous 16 sectors. The block is a processing unit (ECC block) for 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 on a predetermined track of the optical disk 1 with a laser beam Le using a collimator lens, an objective lens, and the like, and controls the objective lens using 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 unit (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 is a 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, when the resolution of an image to be recorded or a high-speed scene such as a car race is selected, or when control data for setting with priority on the recording time is input from the key input unit 10 or the input terminal 12. The system controller 9 recognizes the control data, changes the recording time based on the recognition result, and allows an external user to select the setting.

Here, for example, when a signal is reproduced from the optical disk 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 reproduces a reproduction signal and a tracking and focusing servo signal (tracking signal) from the RF signal. Error and focus error signals). Further, the amplifier unit 4 includes an equalizer that optimizes at least the frequency characteristics of the reproduced signal, a PLL (phase lock loop) circuit that extracts a byte clock from the reproduced signal and generates a speed servo signal, and a signal from the PLL circuit. A jitter generator for extracting a jitter component from a comparison between the byte clock and the time axis of the 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 this 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. Recording / reproducing, 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 disk 1 will be referred to as a recording rate, and the reproduction speed (reproduction data transfer rate) of the optical disk 1 will be referred to as a reproduction rate.

The driver 7 operates based on each servo control signal from the servo unit 8. The driver 7 rotates the spindle motor 2 in accordance with the rotation 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 this 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. By driving the biaxial actuator of the optical head 3 accordingly, focusing and tracking of the laser spot on the optical disk are performed.

The signal processing unit 5 during reproduction of the optical disc 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 modulated signals) to NRZ (Non Return to Zero) data, and further perform error correction processing.
The address data and the reproduction data of the sector on the optical disk 1 are obtained. The address data and the synchronization signal obtained by the signal processing unit 5 are sent to the system controller 9. The details of the error correction processing performed by the signal processing unit 5 will be described later.

Here, the reproduction data is, for example, MPEG
In the optical disk device of this embodiment, the data is temporarily stored in, for example, a 64-Mbyte D-RAM (track buffer memory 14). By controlling the writing / reading of the data, the time variation of the variable transfer rate of the reproduced data is absorbed. Note that the track buffer memory used in this embodiment is a buffer memory for temporarily storing compressed data, and 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. Management of the storage capacity and storage area of the track buffer memory 14,
The reading control is performed by, for example, the system controller 9 via the signal processing unit 5.

The AV encoding / decoding section 6 at the time of reproducing the optical disk 1 converts the reproduced 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 disc 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 64M bit DR memory 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 also record and reproduce data such as still image information and 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 and data such as a program file via the system controller 9 to generate an NRZ signal. And EFM +
, 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 DVD video, DVD audio, DVD-ROM, etc., and conforms to the DVD standard. Not only this DVD-RW, but also on a write-once or rewritable optical disk, the address of a sector is usually 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, but in the case of the DVD-RW of the present embodiment, the address recording is more performed. To enable high-speed and high-density recording, a so-called LPP (land pre-pit) is used to form a predetermined pit in a land portion on an optical disk together with a wobbling frequency signal of the groove.
It also uses an address method.

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, the operation of recording a copy guard area handled in the embodiment of the present invention will be described below. In the present embodiment, one error correction block (ECC block) is composed of 16 consecutive data sectors (32 kBytes) of the data area, and this ECC 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.

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

According to this method, one ECC block has two linkings (joints). At the time of reproduction, the data area of, for example, about 2 sync frames * 2 places may be destroyed due to the amplitude fluctuation at the joint, the phase shift of the recording signal, and the like. An error does not occur, and the copy guard data composed of the prepits can be reproduced stably.

In the reproducing apparatus, data copied illegally by the key data recorded in the pre-pit cannot be reproduced because the key data is different.
On the other hand, personal data captured by a video camera or the like can be reproduced on a DVD video or the like by using the key information. 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. In the embodiment of the present invention described above, the DV
Although the description has been made using the D video, the same applies to the DVD audio, and it goes without saying that the present invention can be applied to a medium capable of high-density recording other than the DVD.

[0073]

As described above, according to the present invention, in an information recording medium for recording and reproducing information using an error correction block as a unit for recording and reproduction, the error correction block for recording the information is configured as a unit for recording and reproduction. Recording area,
Assuming that the error correction capability of the error correction block unit is n bytes as an information amount, a prepit area in which a prepit that can reproduce an error correction block as a unit of recording and reproduction is formed in n or more bytes of the predetermined error correction block unit. In addition, by having an error correction block recorded as information having an information amount less than one error correction block, even if information is recorded as an error correction block as a unit of recording and reproduction, this cannot be reproduced. The copyright protection of this information can be ensured.

[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 method of manufacturing an information recording medium master related 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 method of manufacturing an information recording medium master related to the present invention.

FIG. 8 is a block diagram for explaining an information recording medium recording / reproducing apparatus related to the present invention.

FIG. 9 is a diagram 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.

[Explanation of symbols]

 Reference Signs List 1, D disk, optical disk (information recording medium) 1A glass substrate 1B second resist layer 1C intermediate layer 1D first resist layer 3 optical head 5 signal processing unit 6 AV encoding / decoding unit 9 system controller 14 track buffer memory d1, d2 Depth (first and second depths) G Groove area pr Recording position PR Prepit area R Recording area

Claims (2)

[Claims] 1. An information recording medium for recording and reproducing information using an error correction block as a unit of recording and reproduction, wherein: a recording area configured as an error correction block for recording the information as a unit of recording and reproduction; Assuming that the error correction capability of the memory is n bytes as the information amount, the pre-pit area in which the pre-pit which can reproduce the error correction block as a unit of recording and reproduction is equal to or more than the predetermined error correction block unit of n bytes and one error correction block An information recording medium comprising an error correction block recorded as information having an information amount less than a block. 2. An information recording medium for recording and reproducing information by using an error correction block as a unit of recording and reproduction, comprising: a recording area configured as an error correction block for recording the information as a unit of recording and reproduction; Assuming that the error correction capability of the block unit is n bytes as the information amount, the pre-pit area in which the pre-pit that can reproduce the error correction block as a unit of recording and reproduction is equal to or more than n bytes of the predetermined error correction block unit and one An information recording medium reproducing method for reproducing information in units of error correction blocks from an information recording medium having an error correction block recorded as information having an information amount less than the error correction block, A recording area;
An information recording medium reproducing method, comprising: reproducing an error correction block including the pre-pit area as continuous correction block information.