JP3389989B2 - Information recording medium, information recording medium reproducing method, and information recording medium recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording which is a high-density recording type disc capable of copying at least one copy of information prohibited from being copied, but prohibited from copying at least once. The present invention relates to a medium , an information recording medium reproduction method, and an information recording medium recording method .

[0002]

2. Description of the Related Art Generally, in DVD-RW (Reritable) and other high-density recording discs that can be recorded multiple times with compatibility with DVD video, copyright-protected content and non-copyrighted content are distinguished. Therefore, it is necessary to prevent illegal copying of content. DVD video is a reproduction-only disc, and the copyright information of content copy prohibition is CSS.
(Content scramble system) is recorded in a predetermined area (CSS area) of the disc (recording of CSS key). A system for preventing illegal copying is adopted in which the DVD video playback apparatus reads out the CSS key and plays back the content using the CSS key.

On the other hand, a high-density disk recording device is 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 out, so that copy-prohibited DVD video content can be played back. As a result, a situation occurs in which the copyright of the copy-prohibited DVD video cannot be protected.

By the way, although it is not a high-density type disc that can be recorded a plurality of times, a disc that can be recorded only once, such as a DVD-R (Rewritable), is normally recorded with a CSS key for DVD video. To a predetermined area (CSS area) of the disc that is
A special code other than the S key is recorded and processed so that the CSS key cannot be overwritten later. As a result, DVD-contents that are not recorded with a CSS key in a high-density disc recording device are recorded on a DVD-
When R is played back by a DVD video playback device, CS
Since the S key cannot be read, the DVD video content cannot be reproduced. As a result, copyright protection of copy-prohibited DVD video can be achieved.

[0005]

SUMMARY OF THE INVENTION As described above, DV
Since the D-R can be recorded only once, the copyright protection of the copy-prohibited DVD video content can be achieved if the CSS key cannot be read. On the other hand, in the high-density type disc that can be recorded a plurality of times as described above, even if special data (a special code other than the CSS key) is recorded in the CSS area like DVD-RW, If a regular CSS key (a copy-permitted CSS key) is overwritten, the DVD-Video content that cannot be copied can be easily reproduced and illegally copied. As a result, in a high-density disc that can be recorded a plurality of times, there is a situation where the copyright protection of copy-prohibited DVD video content cannot be performed. In addition, a high-density disc that can be recorded a plurality of times is required to be able to reproduce and copy DVD video content that is not prohibited from copying or self-recorded video content.

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

[0007]

In order to solve the above-mentioned problems, the present invention provides an information recording medium , an information recording medium reproducing method and an information recording medium having the following configurations (1) to (3).
Provide a recording method .

(1) In an information recording medium for recording / reproducing information using an error correction block as a recording / reproducing unit, the information is recorded in error correcting block units, and has a first depth having address information. And a prepit area in which a second depth reproducible prepit having an information amount larger than n bytes is formed, assuming that the error correction capability in units of error correction blocks is n bytes. And the pre-pit area is sandwiched between the recording areas. (2) error correction block information recording medium for recording and reproducing information as a unit of recording and reproducing is the information is configured to record in the error correction block, and recording and reproducing of the first depth with address information Possible recording area and error correction capability in units of error correction blocks are n
When bytes, and a pre-pit region formed with the second depth renewable prepits having a larger amount of information than n bytes, the pre-pit region is configured by sandwiched between the recording area, the information from the recording medium, wherein
In the information recording medium reproducing method for reproducing the error correction block units of information, by the step of reproducing said recording area to a boundary portion of the pre-pit region, the error correction block of said pre-pit region, as a continuous information An information recording medium reproducing method characterized by the above. (3) Information with error correction block as the unit of recording / playback
An information recording medium to be recorded / reproduced records the information in an error correction block.
Address information.
A recording area capable of recording and reproducing at a first depth,
Error correction capability in units of error correction blocks is n
Bytes have the amount of information greater than n bytes.
Pre-pits with 2 deep reproducible pre-pits
And the pre-pit area is in the recording area.
Is configured pinched, in the information recording medium, the information
In an information recording medium recording method for recording information,
Generating error correction block information; and
According to the address information of the recording area.
Other than the pre-pit area of the error correction block including the area
The error correction block information is recorded in the recording area.
Information recording medium recording, characterized by comprising steps
Method.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The information recording medium , information recording medium reproducing method and information recording medium recording method of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view for explaining an embodiment of the information recording medium of the present invention, FIG. 2 is a diagram for explaining that data to be recorded on the information recording medium of the present invention is made into ECC blocks, and FIG. FIG. 5 is a diagram for explaining recording of ECC block data in a predetermined area of the information recording medium of the present invention in units of sectors;
FIG. 4 is a diagram showing an example of an information recording medium according to the present invention.
The figure which shows the physical format of 1 sector in RW,
FIG. 5 is a diagram for explaining the laminated state of the glass master used in the information recording medium master manufacturing method related to the present invention, FIG. 6 is a light quantity versus sensitivity characteristic diagram of the resist layer laminated on the glass master, and FIG. FIG. 8 is a diagram for explaining the steps of the information recording medium master manufacturing method related to the present invention, FIG. 8 is a block diagram for explaining the information recording medium recording / reproducing apparatus related to the present invention, and FIG. 9 is the information of the present invention. It is a figure for demonstrating the relationship between the data recorded on the predetermined area | region of a recording medium, and an ECC block. In the following description, a DVD-RW is used as an embodiment of the information recording medium of the present invention.
Although mainly recording information on RW, other recordable CD-RW, DVD + RW and next-generation DVD
Needless to say, the present invention can also be applied to high-density optical disks such as the above.

First, before describing the embodiment of the present invention, copy guard data (copy-inhibited CSS key = C
(SS data) is recorded on the disk, and the point which enables it to be read stably will be described. This point is obtained by satisfying all of the following.
That is, the CSS data is recorded so that it cannot be erased.
The data amount is set to a predetermined amount or more so that the CSS data cannot be altered by correction. It is configured so that CSS data can be read. When recording, the CSS data is excluded. By satisfying all of the above, in the DVD-RW player, the content of the DVD video that is copy-guarded (copy prohibited) cannot be illegally copied, while the copy-free DVD (copy is not prohibited) In the case of video or self-recorded video content, copy-protected DV by making it possible to copy at least once
It is possible to promote copyright protection of D-video content.

In other words, the above description will be specifically described. The present invention is a solution that satisfactorily solves the following problems (1) to (3). (1) DVD video is a playback-only disc, and CS
The S data and the 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 recorded content is recorded in the groove area. In order to optimize the recording / reproducing characteristics, the groove area is compared with the land area. Is approximately λ / 16. For this reason, CSS data in DVD video is converted to DVD-RW.
In this case, the CSS data is not composed of pre-pits having a depth of about λ / 16 of DVD-RW, but is composed of deep pre-pits of about λ / 4 to λ / 8. As a result, the DVD video player can satisfactorily reproduce CSS data of a deep prepit of about λ / 4 to λ / 8 in the DVD-RW.

(2) In a DVD video player,
Even if the CSS data of a deep pre-pit of about λ / 4 to λ / 8 in DVD-RW can be reproduced well,
If the CSS data has a small amount of data within the correction capability range of the ECC block including the CSS data recording area (pre-pit area), errors are corrected during reproduction. Therefore, the present invention provides a CS composed of prepits.
The data amount of S data is set to a predetermined amount or more exceeding the range of 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 on the recording / reproducing apparatus side, or obtained as an external input signal, and this pre-pit is recorded. The CSS data and the content data constitute ECC block data, and this data is recorded in a recording area other than the pre-pit area, so that the ECC block can be reproduced as data including CSS data during reproduction.

Now, embodiments of the present invention will be described in the following order. A. “Embodiment of Recording Format” “Embodiment of Disk” C.I. "Configuration of information recording and playback 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 for the recording 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.

In general, the recording information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. In one data sector 20, 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 continuous data sectors 20.

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

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

Next, the correction block 34 of the 192 rows described above.
Are arranged in the vertical direction, the correction block 34 of the 192 rows is divided in the vertical direction from the beginning for each byte, and 16 ECCs are divided for each divided data.
An outer code (PO (Pality Out) code) 32 is added. Note that the ECC outer code 32 is also added to the portion of the ECC code 31 in the correction block 34.

As a result of 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 (172 + 10) bytes × (192 + 16) rows = 378
Of these, the data recorded in the actual data area 24 is 2048 bytes × 16 = 32768 bytes.

The ECC block 3 shown in FIG.
In 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, ECC internal 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.
W is continuously recorded on W. Here, as shown in FIG. 2B, the ECC block 30 is divided into the ECC code 31 and the E code.
The configuration including both CC outer codes 32 is shown in FIG.
In order to correct the data arranged in the horizontal (horizontal) direction in (B) with the ECC inner code 31, and to correct data arranged in the vertical (vertical) direction in FIG. It is. That is, E shown in FIG.
In the CC block 30, it becomes possible to perform error correction twice in the horizontal (horizontal) direction and the vertical (vertical) direction,
Compared to the error correction processing used in a conventional CD (Compact Disk) or the like, the error correction can be performed more powerfully.

More specifically about this point, for example,
One correction block 34 (as described above, one row of ECC
A total of 182 bytes of data including the inner code 31 is recorded and continuously recorded on the DVD-RW. If it is up to 5 bytes, it can be corrected even if it is destroyed by scratches, etc., but if all of one column is destroyed by scratches on DVD-RW etc. with 6 bytes or more, it can be corrected by ECC code 31. Disappear. However, even if all the columns are destroyed due to scratches or the like, when viewed from the vertical direction, only one byte of data is destroyed for one ECC outer code 32. Therefore, if error correction is performed using the ECC outer code 32 of each column, even if all of one correction block 34 is destroyed, correct error correction can be performed and reproduction can be performed accurately. However, taking into account the occurrence of acquired scratches, etc., when the horizontal (horizontal) scratches become large,
Needless to say, it will also lead to errors in the next vertical row (horizontal). 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.
The data sector 20 configured to 0 is specifically a DVD
How to record in -RW will be described with reference to FIG. In FIG. 3, data indicated by “D #. *” Corresponds to the data described in FIG.

When recording the ECC block 30 on the DVD-RW, first, as shown in FIG.
The block 30 is divided into 16 recording sectors 40 by being arranged in a line 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 data sector 20 and ECC code 31 or E.
CC outer code 32 is mixed. However, ID information 21 (see FIG. 2A) in the data sector 20 is arranged at the head of each recording sector 40.

Then, one recording sector 40
3B and 3C, the data 41 is divided into 91-byte data 41, and a sync H is added to each.
After that, the recording sector 40 in this state is changed to 8-
By performing 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. Also, 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 collectively described with reference to FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. In other words, the horizontal row is composed of 13 rows including 172 bytes of data, 10 bytes of PI and 4 bytes of sync, 186 bytes, and 12 rows of vertical columns plus one row of PO. The sink is 2 from H0 to H25
There are 26 bytes.

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

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

The information recording medium of the present invention is shown in FIGS.
As shown in (C), the first information (DVD video content for which copying is prohibited) cannot be copied, but the second information (DVD video for which copying is not prohibited 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. Copyright information (for example, unlimited copying, one copying permitted, copy permission permitted for the region R and the first information and copying permitted for the second information at least once) A pre-pit area in which a pre-pit having a second depth d2 deeper than the first depth d1 is formed (in the CSS area pr). An information recording medium characterized by comprising a R. In FIG. 1, Le is the irradiation direction of the recording / reproducing laser beam. Further, the information recording medium of the present invention can reproduce the copyright information related to the copy of the second information recorded in the pre-pit area PR.

Further, the information recording medium of the present invention is shown in FIG.
As shown in FIG. 7C, the first information (DVD video content for which copying is prohibited) cannot be copied, but the second information (DVD for which copying is not prohibited).
Video or self-recorded video content)
Is an information recording medium (optical disc) D that can be copied at least once, and a first recording area R that records the second information in units of a predetermined error correction block using a first recording technique. 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
The copyright information indicating that the information can be copied at least once is recorded using the second recording method as information having an information amount of n bytes or more in the predetermined error correction block unit. Recording area (pre-pit area) PR
And an information recording medium. In the information recording medium of the present invention, the first recording method is phase change recording, and the second recording method is prepit recording.

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

Also, the information recording medium master manufacturing method related to the present invention is an information recording medium master manufacturing method for manufacturing the master of the information recording medium D as shown in FIGS. A first photosensitive film (second resist layer) 1B, an intermediate layer 1C, and a second photosensitive film (first resist layer) 1D are sequentially stacked on the substrate 1A, and the intermediate layer 1C is laminated.
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 property is the same. The total thickness of the film 1B and the intermediate layer 1C and the thickness of the second photosensitive film 1D is the second thickness of the information recording medium D.
The recording area (pre-pit area) PR is stacked so as to be equal to the depth d2, and the exposure laser is irradiated from above the second photosensitive film 1D with the first light intensity, whereby the first The first photosensitive region 1D and the intermediate layer 1C are exposed to form the first recording region R on the glass substrate 1A, and the second light intensity is higher than the first light intensity. By irradiating the exposure laser from above the second photosensitive film 1D, the second photosensitive film 1D is irradiated.
And the intermediate layer 1C and the first photosensitive film 1B are all exposed to form the second recording region PR on the glass substrate 1A. is there.

Specifically, FIG. 5 shows the depth λ at which a signal should be recorded as described above at the time of manufacturing the master of the disk D.
In order to form a groove region G of about / 16 and a deep pit of about λ / 4 to λ / 8 of only the prepit region PR, the first resist layer 1D and the second resist layer 1B are
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 by forming a photosensitive resist layer made of, for example, polyvinyl alcohol on the glass substrate 1A by spin coating or the like. It becomes. Thus, the second resist layer 1, the intermediate layer 1C, and the first resist layer 1D are sequentially laminated on the glass substrate 1A. The first resist layer 1D and the second resist layer 1B have a low light amount (weak light amount) with respect to the light intensity of the krypton laser having a wavelength of 351 nm for recording (see FIG. 6). The second resist layer 1B is configured to react with each other with a high light amount (strong light amount) (the light sensitivity property 1BB shown in FIG. 6).
As in (A) to (C), in order to form the groove region G and the pre-pit region PR, cutting is performed while switching the light intensity in three steps (strong, normal, and weak).

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

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

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

On the other hand, if this area is, for example, about one sector or less and the amount is within a range that can be corrected, when this area is overwritten for illegal copying, it becomes an ECC block. No matter what is written in the CSS data, a signal to be copied illegally is read out as a result of correction and does not make sense. Therefore, the amount of pre-pits has an important meaning.

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

C. “Configuration of Information Recording / Reproducing Device” Furthermore, “Configuration of Information Recording Device” will be described. As shown in FIG. 8, the information recording medium recording / reproducing apparatus related to the present invention is an information recording medium recording / reproducing apparatus for recording / reproducing the second information on the information recording medium D, and the information recording medium Management means (system controller) 9 for managing the sector address of the recording area R and the recording timing for recording in the recording area R based on the sector address read from D, and the prepit area P
Storage means (memory) 14 for storing R sector addresses and copyright information indicating copy prohibition for the first information and copy permission for the second information at least once. And information generation means (signal processing unit) 5 for sequentially generating error correction block information in a predetermined error correction unit based on recording information including the copyright information and the second information, and a series of the errors Based on the copyright information reproduced from the prepit area PR, the recording area (optical head) 3 for recording the correction block information in the recording area at the recording timing, and the recording area R
And a reproducing means (AV encoding / decoding unit) 6 for reproducing the second information by sequentially reading out the error correction block information recorded in the information and correcting the error in a predetermined error correction unit. This is an information recording medium recording / reproducing apparatus.

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

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

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

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

The optical head 3 uses a semiconductor laser as a light source, a laser spot is formed by a laser beam Le on a predetermined track of the optical disk 1 by a collimator lens, an objective lens, and the like. By driving, laser spot focusing and tracking 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 this key input unit 10, recording start, reproduction start, recording stop,
Various kinds of key operation input information for instructing to stop reproduction can be input by the user.

Interface unit (ATAPI) 13
Is an interface for transmitting / receiving data to / from a computer, for example, so-called ATA.
PI (ATA Packet Interface) interface.

The system controller 9 includes a key input unit 1
As key operation input information from 0, in accordance with various key operation input information such as recording start, reproduction start, recording stop, reproduction stop, etc., LSI (signal processing unit 5, servo unit 8,. An amplifier unit 4, an AV encoding / decoding unit 6, and the like). Data is transmitted and received via the interface unit 13. For example, when the resolution of an image to be recorded or a scene with a high speed such as a car race is selected, or when control data for setting recording time priority is input from the key input unit 10 or the input terminal 12 The system controller 9 recognizes the control data, changes the recording time based on the recognition result, and allows an external user to select the setting.

Here, for example, when a signal is reproduced from the optical disc 1, a reproduction start command is issued from the key input unit 10. At this time, the system controller 9 responds to the reproduction start command by an amplifier described later. The unit 4, the servo unit 8 and the driver 7 are controlled. That is, the optical disc 1
When the signal is reproduced from the system controller 9
First, the optical disc 1 is rotated and a laser spot is irradiated onto the optical disc 1, an address signal formed in advance on a signal track on the optical disc 1 is read, and a target sector (to be reproduced from the address information) The optical head 3 is moved so that the 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 unit 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 also reproduces the reproduced signal and the tracking and focusing servo signal (tracking) from this RF signal. Error and focus error signal). The amplifier unit 4 includes at least an equalizer that optimizes the frequency characteristics of the reproduction signal, a PLL (phase lock loop) circuit that extracts a byte clock from the reproduction signal and generates a speed servo signal, and outputs from the PLL circuit A jitter generator for extracting a jitter component from a comparison between the byte clock and the time axis of the reproduction signal;
The jitter value generated by the amplifier unit 4 is sent to the system controller 9, the tracking and focusing servo signal and the speed servo signal are sent to the servo unit 8, and the reproduction signal is sent to the signal processing unit 5.

The servo unit 8 receives the speed servo signal from the amplifier unit 4 and the focusing and tracking servo signal of the optical head 3, and the spindle motor 2.
Rotation servo signals are received from the servomotors, and servo control of corresponding parts is performed based on these servo signals. Specifically, the servo unit 8 is connected to 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 set at a predetermined constant. A rotation speed servo control signal that rotates at a linear speed 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) faster than the maximum data transfer rate at the time of internal compression / decompression. Therefore, the servo section 8 is recorded / reproduced.
Generates a rotation speed servo control signal for rotating the optical disc 1 at a constant linear speed that matches the recording speed / reproduction speed.

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

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

The signal processing unit 5 at the time of reproducing the optical disc 1
The reproduction signal supplied from the amplifier unit 4 is A / D (analog / digital) converted, the synchronization is detected from the digital signal obtained by the A / D conversion, and the so-called EFM + signal applied to the digital signal. (8-1
6 modulation signals) to NRZ (Non Return to Zero) data, and error correction processing,
The sector address data and reproduction data 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. Details of the error correction processing and the like performed by the signal processing unit 5 will be described later.

Here, the reproduction data is, for example, MPEG.
In this type of optical disk apparatus, the data is temporarily stored in, for example, a 64-Mbyte D-RAM (track buffer memory 14), and the track buffer memory 14 By controlling the writing / reading of the data, the time fluctuation of the variable transfer rate of the reproduced data is absorbed. The track buffer memory used in this embodiment means a buffer memory that temporarily stores compressed data. For example, a buffer memory for absorbing a variable transfer rate generally provided in a DVD And a buffer memory used for MPEG encoding and decoding. Management of storage capacity and storage area of the track buffer memory 14, writing /
Read control is performed by, for example, the system controller 9 via the signal processing unit 5.

The AV encoding / decoding unit 6 at the time of reproduction of the optical disc 1 is data in which reproduction data supplied from the track buffer memory 14 is compression-encoded by, for example, MPEG2, and audio data and video data are multiplexed. The multiplexed compressed audio data and compressed video data are separated from each other and MPE
The signal is decompressed and decoded by G2 and 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 an NTSC (National
Television System Committee) is processed by an encoder and displayed on a monitor device, and an audio signal is sent to a speaker (not shown) and emitted. Note that the decompression decoding speed (data transfer rate at the time of decompression decoding, hereinafter referred to as the decompression rate) in the AV encoding / decoding unit 6 at the time of reproduction is a recording to be described later set at the time of recording. The expansion rate depends on the mode. In other words, the AV encoding / decoding unit 6 is capable of decompression decoding processing according to a plurality of decompression rates, determines the decompression rate according to the recording mode set at the time of recording, and at that rate Perform decompression decoding. The information of the recording mode is recorded on the optical disc 1 together with the recording data as control data, and the control data is read when the optical disc 1 is reproduced and sent to the system controller 9, and the system controller 9 is based on the control data. Thus, the expansion rate of the AV encoding / decoding unit 6 is set. Note that the D / A conversion can also be performed outside the AV encoding / decoding unit 6.

On the other hand, for example, when recording a signal on the optical disk 1, a command to start recording is given 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 is controlled. That is, when performing signal recording on the optical disc 1, first, the optical disc 1 is rotated and a laser spot is irradiated onto the optical disc 1, and an address signal previously formed as a prepit on the signal track on the optical disc 1 is recorded. The target sector (track) to be recorded is found from the address information, and the optical head 3 is moved so that the laser spot is arranged on the target sector (track). The details of the address signal recorded in advance on the optical disc 1 will be described later.

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

It should be noted that the memory is a 64 Mbit D-R.
The AM 15 is a memory for temporarily storing data when the AV encoding / decoding unit 6 performs compression / decompression. A / D conversion can also be performed outside the AV encoding / decoding unit 6.

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

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

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

Also, the system controller 9 at this time
Measures the jitter value from the amplifier unit 4 by A / D (analog / digital) conversion, 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 a signal is recorded on the optical disc 1, the amplifier unit 4 corrects the waveform of the signal from the signal processing unit 5 and sends the waveform-corrected signal to the laser drive circuit of the optical head 4.

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

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

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

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

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

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

The reproducing apparatus cannot reproduce the data illegally copied by the key data recorded in the prepit because the key data is different.
On the other hand, personal data shot with a video camera or the like can be reproduced with a DVD video or the like using this key information. The contents of the disk structure, manufacturing method, and recording / reproducing procedure are merely examples, and are not limited to this range. In the above-described embodiment of the present invention, DV
Although described using D-video, the same applies to DVD audio, and it goes without saying that the present invention can also be applied to media capable of high-density recording other than DVD.

[0073]

As described above, according to the present invention, a recording area is obtained.
The copyright protection of the information recorded in the area 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 EC data recorded on the information recording medium of the present invention.
It is a figure for demonstrating making it into C blocks.

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

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 1 sector in -RW.

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

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

FIG. 7 is a diagram for explaining a process of an information recording medium master manufacturing method 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 the 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]

1, D disc, optical disc (information recording medium) 1A glass substrate 1B Second resist layer 1C Middle layer 1D first resist layer 3 Optical head 5 Signal processing section 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 pre-pit area R Recording area

Claims (3)

(57) [Claims] 1. An information recording medium for recording / reproducing information using an error correction block as a unit of recording / reproduction, wherein the information is recorded in error correction block units, and has a first depth having address information. A recording area that can be recorded / reproduced, and a prepit area in which a second depth reproducible prepit having an information amount larger than n bytes is formed, assuming that the error correction capability of the error correction block unit is n bytes. The information recording medium is characterized in that the prepit area is sandwiched between the recording areas. 2. An information recording medium for recording and reproducing information an error correction block as a unit of recording is configured the information to record in the error correction block, and the first depth with address information A recording area that can be recorded / reproduced, and a prepit area in which a second depth reproducible prepit having an information amount larger than n bytes is formed, assuming that the error correction capability of the error correction block unit is n bytes. The pre-pit area is configured to be sandwiched between the recording areas.
It is in and, wherein the information from the recording medium, the error correction block single said information
In the information recording medium reproducing method for reproducing at a position , the recording area up to the boundary of the prepit area ;
A method for reproducing an information recording medium, comprising: reproducing an error correction block including the pre-pit area as continuous information. 3. An error correction block is used as a recording / reproduction unit.
An information recording medium for recording and reproducing information is Configuration to record the information in error correction block units
And recording / reproducing at a first depth having address information
Possible recording area, The error correction capability of the error correction block unit is the amount of information.
N bytes, the amount of information is larger than n bytes.
A second depth reproducible pre-pit was formed. Pripi
And an area The pre-pit area is configured to be sandwiched between the recording areas.
It is , Information recording medium for recording the information on the information recording medium
In the recording method, Step of generating error correction block information to be recorded
When, According to the address information of the recording area,
The pre-pit area of the error correction block including the code area
The error correction block information is recorded in the recording area other than
An information recording medium characterized by having a recording step
Body recording method.