JP2002230775A - Recorder for information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder for information recording medium which can obtain good reproduction information both from a reproduction-dedicated pit string and from a guide groove for recording/reproducing and can obtain optimum tracking characteristics at all times even in an unrecorded region as well as in a recorded region, by reproducing the intermediate area consisting of the pit rows by a tracking system of a differential push-pull system or a differential phase detect system. SOLUTION: The method employs an information recording medium in which bottom surface positions of the guide grooves and the pit rows formed on a disk substrate are both flat on a same plane, and an intermediate region consisting of pit rows is provided where the height from the bottom surfaces to the side surfaces of the grooves and the height from the bottom surface to the side surfaces of the pit rows vary at the portions changing-over from the pit rows to the guide grooves and vice versa.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing area (guide groove, groove) and a reproduction-only area (area in which a pit row is formed), and address information of the recording / reproducing area includes a land (guide groove). For example, a DV formed as a land pre-pit (hereinafter referred to as “LPP”)
The present invention relates to a recordable information recording medium recording device such as a D-RW.

[0002]

2. Description of the Related Art In general, a high-density recording type optical disk such as a DVD-RW which can be recorded a plurality of times with compatibility with a DVD video (hereinafter sometimes simply referred to as a recording type optical disk).
In, the content protected by copyright must be distinguished from the content not protected by copyright, so that illegal copying (recording and reproduction) of the content must not be performed without permission. A DVD video is a read-only disc, and copyright information for prohibiting copy of content is recorded in a predetermined area of the disc (information area related to copyright protection such as a CSS key) by CSS (content scramble system). I have. Then, a system for preventing illegal copying is adopted, in which a DVD-Video playback device reads information related to copyright protection such as the CSS key and reproduces the content using the information related to copyright protection such as the CSS key. ing.

[0003]

A high-density disc in which DVD-Video contents are recorded together with information on copyright protection by the above-described high-density disc recording apparatus is called a DV.
When the content is reproduced by a D-video reproducing device, there is a possibility that information related to copyright protection may be read out, so that copy-protected DVD-Video contents can be reproduced. There was a problem that it could not be sufficiently protected.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an information recording medium recording apparatus having the following configuration. An information recordable area formed from a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and a signal to be reproduced are recorded as pits. An information recording medium, comprising: a first read-only area in which a signal to be reproduced is recorded as pits; and a second read-only area in which a frequency signal and an address signal are recorded in advance. Recordable area and the first
In the vicinity of the boundary between the read-only area and the tracking error signal near the boundary, the amplitude in both directions from the center of the amplitude of the tracking error signal in the information recordable area,
An information recording medium recording device that records information on an information recording medium defined as a ratio of the amplitude of the tracking error signal, wherein the information can be continuously reproduced near a boundary of the information recordable area. Tracking means for performing tracking based on the amplitude of the tracking error signal in the information recordable area and the first read-only area;
Address management means for managing an address of the information recordable area; and recording means for recording information based on the address signal up to a boundary between the information recordable area and the first read-only area. Information recording medium recording device.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a recordable disc such as a DVD-RW, a predetermined area (an information area related to copyright protection) of a disc in which information related to copyright protection of DVD video is recorded in a normal state. Then, record information on copyright protection information with embossed pre-pits,
The copyright protection information is processed so that it cannot be overwritten later. Thus, when the DVD video content is recorded on the DVD-RW by the high-density type disc recording device and the content is not compatible with the copyright protection information, and when the DVD video playback device reproduces the content, the content is compatible with the content. Since the copyright protection information cannot be read, DVD-Video contents cannot be reproduced. As a result, the copyright of the copy-protected DVD video can be protected.

[0006] For a recordable optical disk, conditions for specifying the light amount of a recording laser, the type of the disk, already recorded information such as the name of a manufacturer, or address information for finding a specific position of a recordable guide groove, as well as the disk The frequency information used for the rotation speed control is previously recorded at a specific position.

[0007] The recording type optical disc is devised so that use (recording) can be started immediately after purchase. This can be performed by recording the above-mentioned recorded information and address information at a specific position on the disc as in the following (1) to (3). That is,

(1) The previously recorded information is recorded as embossed pits at the time of cutting the master disk, and the disk substrate is formed by using a metal matrix formed by the master disk, thereby obtaining the above-described recording mold. Recording is performed at a specific position (such as a lead-in area of the disk) on the disk substrate of the optical disk. Further, when the recorded information is not recorded at the time of cutting the master disc,
At the time of shipment after the above-mentioned recordable optical disc is produced,
Using a recorder for recording the already-recorded information, pits and marks are additionally recorded at the above-described specific positions.

(2) On the other hand, the address information described above is recorded as LPP in a specific portion of the guide groove with an increased width. (3) Further, the above-mentioned frequency information is recorded as a frequency of a wobble in which the guide groove is slightly shaken in the radial direction.

The recording of the recorded information, the address information, the frequency information, and the guide groove at a specific position on the disk substrate is specifically performed as follows. First, a photosensitive resist is uniformly applied on a smooth polished glass disk to a thickness corresponding to the depth of the guide groove. If the recordable optical disc is a DVD-RW disc, the photosensitive resist is uniformly applied to a thickness of about 30 nm on a glass disc.

Next, the glass disk (resist disk) on which the photosensitive resist is uniformly applied is carried to a cutting device. The cutting device is equipped with a laser beam control device that changes a cutting laser beam emitted from a light source into intermittent light or slightly fluctuates in the radial direction (left and right). After the resist disc is mounted at a predetermined position of the cutting device, by irradiating the resist disc with intermittent light or a cutting laser beam slightly vibrated in the radial direction onto the resist disc, the previously recorded information,
Address information and frequency information are recorded at each specific position.

Here, two cutting laser beams are used, one of the cutting laser beams is used as continuous light to form a guide groove, and the other is intermittently formed to form an LPP. The recorded information is recorded as a pit at a specific position (such as a lead-in area) by using a cutting laser beam that forms a guide groove as intermittent light.

After cutting the resist board,
The resist disc is developed and the shape information is changed as the shape information (the previously recorded information, address information, frequency information, guide groove)
Precipitates. Then, a conductive thin film is coated on the developed resist disk, and the above-mentioned shape information on the resist disk is transferred onto the plating disk by using electroplating. By processing this plating board to a desired size and forming a metal matrix, using an injection molding machine equipped with this metal matrix, the shape information is transferred as a shape change onto a plastic substrate by being transferred, A disk substrate of the recordable optical disk described above is obtained.

On the disk substrate, the place where the above-mentioned shape change is transferred is called an information surface, and a functional film for recording is formed on this information surface, and various post-processing is performed thereafter. And a recordable optical disk is created. By the way, in the disk substrate obtained by injection molding using the above-described metal matrix, the guide grooves and the pits have the same depth over the entire disk substrate.

As described above, since the guide groove of the recordable optical disk is formed at a depth necessary for tracking guide at the time of recording, it is attempted to take out the signal from the record mark recorded at the time of reproduction to the maximum. Then, there is a problem that the reflectance is reduced due to the phase difference of the reflected light caused by the depth difference between the recording groove and the land. In land / groove recording such as that employed in a DVD-RAM disc that can be repeatedly rewritten, the guide groove is limited to an allowable range in order to reduce crosstalk between tracks between lands (between guide grooves) and grooves (guide grooves). In general, the depth of the guide groove is made shallower than the depth (1/8 wavelength of the reproduction wavelength) at which the guide signal from the guide groove is most efficiently taken out. It is a target. The tracking operation to the guide groove is performed by the push-pull method.

On the other hand, a read-only disk, DVD-R
In the OM disk, the depth of the pit is set near the depth at which diffraction by laser light is efficiently performed so that a reproduction signal as large as possible is obtained (1/3 of the reproduction wavelength).
Around 4 wavelengths). Therefore, in the tracking operation, a signal necessary for tracking cannot be sufficiently obtained by the push-pull method for the pit row, and the tracking is performed by the phase difference method.

As described above, the recording type optical disc DV
The guide groove depth is set so that the recording and reproducing operation can be performed efficiently in the D-RAM disk, and the pit depth convenient for reproduction is set in the DVD-ROM disk which is a read-only disk. .

The following two methods (1) and (2) are conceivable as methods for providing guide grooves and pits having different depths on the disk substrate of a single recordable optical disk.

(1) As a first method, as shown in FIG. 7, when cutting the resist disc, a cutting laser beam (laser A for convenience) for forming pits and guide grooves is used. A method of forming a depth that is convenient for pit reproduction with one output and a shallow groove that is convenient for recording a guide groove with the other output. It is. However, in this cutting method, since the bottom surface of the shallower guide groove does not reach the glass master below the resist, the bottom surface of the guide groove is determined not by the glass master but by the output distribution of the laser A. Therefore, the shape of the bottom surface of the guide groove is not flat but funnel-shaped. Actually, the output distribution of the laser A becomes non-uniform with the beam center being the maximum, so that it is difficult to obtain the uniformity of the bottom surface of the guide groove, and the signal characteristics of recording / reproducing greatly deteriorate.

In FIGS. 7 and 8, and in the following description, "LP
"P" indicates a "land pre-pit" formed on the land, and the laser B is described as a laser beam output for forming the land pre-pit for convenience.

(2) As a second method, as shown in FIG. 8, when cutting the resist disc, a cutting laser beam (laser A) for forming pits and guide grooves, This is another method using a cutting laser beam (laser B) for forming land prepits. A pit and a guide groove having the same depth are formed by using a laser A having a constant output (the bottom surfaces of the pit and the guide groove reach the glass master below the resist). Also, a method is used in which the resist adjacent to both ends of the guide groove is exposed to an arbitrary height using a laser B to adjust the relative depth of the guide groove. With this method, the bottom surface of the guide groove is the surface of the glass master disk, and the shape of the bottom surface of the guide groove is flat. Can be.

However, in the second method, when the boundary between the pit row and the guide groove and the transition from the guide groove to the pit row is reproduced, the height of the resist between the two pit rows and the pit row Since the height of the resist is different between the guide grooves (or between the guide groove and the pit row), the pit signal and the land pre-pit at the portion where the pit row is switched from the pit row to the guide groove and from the guide groove to the pit row-pit row are switched. Disturbances such as loss of signal and difference in amplitude, difference in amplitude of tracking signal such as push-pull method and occurrence of offset occur.

As described above, when one recording-type optical disk includes both a pit row having a depth convenient for reproduction and a guide groove having a depth convenient for recording and reproduction, In order to obtain sufficient recording / reproducing characteristics, it is desirable to design the glass master so that the bottom surface is flat and the bottom surface is flat. Then, when reproducing the part where the pit train is switched from the pit row to the guide groove and from the guide groove to the pit row, it was found that there is a recording device in which the pit signal is missing or the push-pull tracking of the reproduction is disturbed at the switched part. . The cause is that the signal of the pit row is affected by the adjustment of the resist thickness of the adjacent guide groove, so that the signal cannot be taken out properly, and the pit row and the guide groove are adjacent to each other. The signal information of all the pit rows was missing. The recording device in which tracking is disturbed in this way is
At the part where the pit train changes from the pit train to the guide groove and from the guide groove to the pit train, the tracking control signal becomes an abnormal value and tracking is lost, and the reproduction track position moves by several tens of tracks or more. Some things became impossible.

As described above, in order to be able to obtain a sufficient reproduction signal by recording / reproducing in the guide groove and record information which cannot be rewritten in the pit row, in the case of one recording type optical disk, It is necessary that the groove depth of the groove and the pit depth of the pit row are the optimum depth respectively, and the bottom surface of the guide groove and the bottom surface of the pit are both flat on the surface of the glass master, and both recording and reproduction are performed. There has been a demand for a disk having excellent characteristics, capable of recording / reproducing even if a pit signal is missing at a portion where a pit and a guide groove are switched, and free from some kind of disturbance of a tracking signal.

Therefore, according to the present invention, in particular, a guide groove and a pit row formed on a disk substrate are both flat on the same plane, and are switched from a pit row to a guide groove or from a guide groove to a pit row. In the part, an intermediate area consisting of a pit row whose height changes between the height from the bottom to the side of the guide groove and the height from the bottom to the side of the pit row is provided, and this intermediate area is tracked by the differential push-pull method Good reproduction information from the pit train dedicated for reproduction by reproducing by the method or the phase difference method,
Good reproduction information can be obtained together with the recording / reproducing guide groove, the optimum tracking characteristic can always be obtained even in an unrecorded area, and the optimum tracking characteristic can always be obtained even in a recorded area. An object of the present invention is to provide an information recording medium recording device capable of stably reproducing copyright protection information of a pit string dedicated to reproduction and recording contents based on the information.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged cross-sectional view for explaining a first example of an information recording medium, FIG. 2 is a diagram for explaining that data to be recorded on the information recording medium is ECC-blocked, and FIG. For recording the data in a predetermined area of the information recording medium in sector units, FIG. 4 is a diagram showing a physical format of one sector in a DVD-RW which is an example of the information recording medium, and FIG. FIG. 6 is a view showing a lead-in area and a data area of the medium, FIG. 6 is an enlarged sectional view for explaining a second example of the information recording medium, and FIG. FIG. 8 is a diagram for explaining another example of the cutting state in the information recording medium.

In the following description, a DVD-RW is used as a form of an information recording medium related to the present invention, and recording of information on the DVD-RW is mainly described. Needless to say, the present invention can be applied to high-density optical disks such as CD-RW, DVD + RW, and next-generation DVDs.

The form of the information recording medium is as follows: "Format of recording format", B. The description will be made in the order of “disc form”. A. "Form of Recording Format" First, "form of recording format" will be described.
First, a general physical format when recording information is recorded on a DVD-RW and error correction processing on the recording information (lead-in information) will be described with reference to FIGS.

An error correction process in a DVD-RW and an ECC block as an error correction unit in the error correction process will be described with reference to FIG.

Generally, the recording information recorded on the 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.

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

Next, the 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 (Parity Out) code) 32 is added. The ECC outer code 32 is also added to the ECC inner code 31 in the correction block 34.

By the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. At this time, one ECC block 30
The total amount of information contained within is (172 + 10) bytes x
(192 + 16) rows = 37856 bytes, of which the data recorded in the actual data area 24 is 2
048 bytes x 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, etc. However, if one row is destroyed by a flaw of DVD-RW, etc. with 6 bytes or more, the ECC internal code 31 can correct it. Disappears. However, even if the entire row is destroyed by scratches, etc., when viewed from the vertical direction,
Only one byte of data is destroyed for one column of the ECC outer code 32. 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 and the like, it is needless to say that a row (horizontal) scratch becomes large, which leads to an error in the next vertical row (horizontal). By the way,
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 information amount in one sync frame 42 is 91 bytes × 8 × (16
/ 8) = 1456 bytes, and this sync frame 4
The information is written on the DVD-RW disc in the form of a series of 2s. At this time, one recording sector 40
Include 26 sync frames 42.

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

By recording information on a DVD-RW disc by constructing the physical format described above, if the information is reproduced by 8-16 demodulation and deinterleaving (see FIG. 3), the original data can be obtained. Since the ECC block 30 can be restored and the amount of destroyed data blocks can be minimized, information can be reproduced most accurately by performing strong error correction as described above. Information related to copyright protection (for example, a media key block) located in the lead-in information area is recorded as a part of data of such an ECC block.

B. [Disc Form] A characteristic intermediate area in a recordable optical disc is a recordable optical disc having a disc substrate created based on a resist disc shown in FIG. 1 as a first example and FIG. 6 as a second example, A read-only area (areas P1 and P2) in which pit strings PA and PB are formed, a recording / playback area (area 1) in which a guide groove 1 is formed, a read-only area (area P1), and a read-only area (area P2) ) Or between the read-only area (area P1) and the recording / reproducing area (guide groove 1).

As shown in FIG. 1, the pit row PA in the area P1
, The bottom of the pit row PB in the area P2 (the glass master), the bottom of the guide groove 1 in the area 1 (the glass master), and the bottom of the pit row PM in the intermediate area (the glass master). 6) are on the same plane, and, as shown in FIG.
The bottom surface of the guide groove 1 in the region 1 (glass master side) and the bottom surface of the pit row PM in the intermediate region (glass master side) are on the same plane.

The depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate area is, for example, as shown in FIG. 1, the land depth (optical depth) on the read-only area (area P1) side. From the depth of the land in the area P1 with respect to the bottom surface (the glass master side) of the pit row PM, the depth a in FIG. 1, the depth of the land in the read-only area (area P2) (optical depth, pit row) The depth of the land (the depth b in FIG. 1) of the land P2 with respect to the bottom surface (the glass master side) of the PM is reduced to a depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate region. For example, as shown in FIG. 6, the depth of the land on the read-only area (area P1) side (optical depth, the depth of the land in the area P1 with respect to the bottom surface of the pit row PM (glass master)), as shown in FIG. Now, from the depth c) in FIG. Depth of the lands (optical depth, the bottom of the pit array PM (the depth of the land area 1 to the glass master side), the depth d of FIG. 6) is configured to decrease.

As described above, even for a recordable optical disk, a disk on which a sufficient reproduction signal can be obtained by recording / reproducing in the guide groove and in which non-rewritable information can be recorded in a pit row is used. The groove depth and the pit depth of the pit row need to be the optimum depths respectively, and the bottom surface of the guide groove and the bottom surface of the pit are both on the surface of the glass master and have excellent recording and reproduction characteristics. It is necessary that the disc has no pit signal missing and no tracking signal disturbance at the switching portion of the guide groove.

Hereinafter, the optical disk will be described with reference to the drawings. 1 and 6 are views for explaining the cutting state of the master optical disc. This optical disk is designed so that the groove depth of the guide groove and the pit depth of the pit row are different by exposing the guide groove resist, and the bottom surface of the guide groove and the pit row depth is formed by the surface of the glass master. In addition, a recording type optical disc is proposed in which a resist exposure laser output is changed and a height of the guide groove is changed at a portion where the guide groove is switched from the pit row to the guide groove and the guide groove is changed to the pit row. In particular, in FIGS. 1 and 6, signals in a range of an amplitude difference and an offset level in which a tracking error signal of a differential push-pull and a DPD (Differential Phase Detect) can be obtained in an intermediate region can be obtained.

As a result, the pit signal adjacent to the guide groove at the switching portion between the pit row and the guide groove is not greatly affected by the resist exposure due to the adjustment of the guide groove resist thickness. It was confirmed that accurate reading of the recorded information and accurate recording of the recorded information in the recording area could be performed.

The master disc of the recordable optical disc is prepared by the following steps using a cutting device (not shown).

A glass disk having a smooth surface is prepared, and a resist is applied on the surface of the glass disk to a thickness corresponding to a depth having a deepest shape (corresponding to the depth of the pit row).
Two lasers (beams) emitted from the laser light source 1
On the optical path of the laser (beam) A of A and B, an optical polarizer for slightly oscillating the laser beam left and right and an optical modulator for changing the laser beam intensity are sequentially provided.

As shown in FIG. 1 or FIG. 6, a guide groove 1 having a bottom surface on a glass master disk surface on a resist disk R has a laser beam intensity (laser beam intensity) suitable for recording the guide groove using a laser (beam) A. PA1). At this time, the bottom surface of the guide groove 1 is exposed to the surface of the glass master. Guide groove 1
Causes a slight wobble at a predetermined frequency. The laser beam B is required for the guide groove 1 because a resist thicker than the resist necessary for forming an appropriate guide groove depth exists beside the guide groove portion (between the guide grooves 1 and the land, land). Laser light intensity (PB
Record in 1). Further, at the time of land pre-pit recording, a laser beam intensity necessary for land pre-pit formation is output.

At this time, a pinhole or the like is inserted on the beam expander 9 for extracting the laser (beam) B. A device for enlarging the spot of the laser (beam) B that emits light may be incorporated, for example, a device for exposing one track width may be included. At this time, the laser (beam) B may also be slightly wobbled at a predetermined frequency.

Next, as shown in FIG. 1, following the formation of the guide groove 1 in the recording / reproducing area (area 1), the guide groove 2 in the pit area pit row PB in the area P2 uses the laser (beam) A. And exposure at a laser beam intensity (PA3) suitable for recording the guide groove 2. At this time, the bottom surface of the guide groove 2 is preferably exposed to the surface of the glass master disk, but is not particularly limited. In addition, laser (beam) B
Next to the guide groove part (between the guide groove and the land. Land)
In the pit row PB (region P), the same resist thickness as that of the guide groove 1 (region 1) remains, and the resist thickness sequentially increases.
In the guide groove 1 adjacent to the pit row PB (area P2), the laser beam reaches the same resist thickness as the pit row PB (area P2) in the guide groove 1 adjacent to the pit row PB (area P2) so that the resist having the thickness required for 2) remains. Formed with light intensity. Further, at the time of land pre-pit recording, a laser beam intensity necessary for land pre-pit formation is output. At this time, the laser (beam) B may also be slightly wobbled at a predetermined frequency.

Subsequently, a laser (beam) A is used to expose pits and is exposed in the entire resist thickness direction in a region P1 having identification information indicating that the optical disk is a recordable optical disk having a pit row PA. The recording is performed at a laser beam intensity (PA2) suitable for the exposure, and the surface of the glass master is exposed. At this time, the pit row PA is slightly wobbled at a predetermined frequency. In some cases, no wobble is needed.

Thus, the recording / reproducing area (area 1)
And a read-only area (areas P1 and P2), a recording / playback area (area 1), and an intermediate area. ) Is recorded.

In the next development step, the latent image is precipitated as a shape change, and carried to a metal master forming step. In the metal master forming process, a conductive film such as nickel is coated on the resist disc R, and nickel plating or the like is applied thereon.
A nickel coating is formed. Thereafter, the metal master made of nickel is peeled from the resist disc R, and the peeled metal master is washed and processed into a size that can be mounted on a molding die. The metal master after processing is called a matrix. A matrix is mounted on a molding die, and a plastic disk substrate is formed by molding.

After that, a recording functional film (recording layer) is formed on the disk substrate, for example, a protective film is applied thereon, or a substrate called a dummy substrate is bonded to manufacture a recording type disk. You.

The first example shown in FIG. 1 and the second example shown in FIG. 6 are formed in almost the same manner, but in FIG.
6 and the area P2 (pit row PB), and in FIG. 6, the intermediate area is a pit area (pit row PM) in the area P2.
1 (pit train PA) and the area 1 which is a recordable area.

The depth (optical depth) of the pit row PM in the intermediate region is equal to or less than the depth (optical depth) of the region P1 (optical depth). In some cases, the depth cannot be specified (optical depth).

Next, the format of the disc will be described. Type 1 shown in FIG.
FIG. 8 shows a state in which the track in the right reproduction-only pit P area is continuously switched to the left recordable groove G (groove) area on the disk described later using the comparative example of FIG. In FIG. 8, "LPP" indicates "land pre-pits" formed on a land, and laser B is a laser beam output for forming land pre-pits. 1 and / or FIG. 6 shows that the depth changes between a track in a pit area dedicated to reproduction on the right and a recordable groove G (groove) area on the left in a disk described later as type 2 in FIG. This indicates that there is an area having a pit which is an intermediate area.

FIG. 5 shows the structure from the lead-in area (inner direction) to the data area (outer direction) of the disk. As described above, the disc manufacturing method differs in this area, and two types of type (type) 1 described in the comparative example and type (type) 2 described in the present example can coexist as a format. It is configured as follows. In this format, the signal performance (recording / reproducing characteristics) is not so good in type (type) 1, but it is relatively easy to manufacture. In type (type) 2, the signal performance (recording / reproducing characteristics) is preferable, but the intermediate region is preferable. The coexistence of the two schemes that require a restriction on the signal performance in the above method can provide flexibility in the manufacturing method.

A lead-in area of type (type) 1 is (1-1) a land area on an outer peripheral side of a wobble and a groove area having a depth of about λ / 12 from an inner circumference which is a recordable / reproducible area. Initial zone, which is a recordable and reproducible area having a land pre-pit LPP having information such as an address and from which a differential push-pull tracking error signal is obtained.
system reserved zone, buff
er zone0, RW-physical form
at information zone, Refer
ence code zone, buffer zone
e1, linking loss area, (1-
2) A read-only area from which a DPD tracking error signal composed of prepits having a depth of about λ / 4 and having wobbles but no land prepits LPP can be obtained and from which a recording signal can be read. Control data with information and lead-in information
zone (Readable emboss with
out LPP), (1-3) in a read-only area in which a DPD tracking error signal having a depth of about λ / 12 and comprising a pre-pit having a wobble and a land pre-pit LPP is obtained and a recording / reproducing signal cannot be read. Certain unreadable emboss zone z w
is a LPP, (1-4) a recordable / reproducible area having a land prepit LPP having information such as an address in a land area on the outer peripheral side of the wobble and groove areas, and a differential push-pull tracking error signal. Buffer zone that gives
e2, da for recording user content that follows
The area is divided in the outer circumferential direction in the order of taarea. Here, the start address of each area is shown at the upper right of each area. The operation at the time of recording of type (type) 1 is shown in Write Mode on the left side of FIG. 5, and the operation at the time of reproduction is shown in Read Mode on the left side of FIG.
"recording" indicates a recording operation, "reading" indicates a reproducing operation, "seek" indicates a seek operation or an operation of skipping a track, and "read gen wclk" indicates an operation of reproducing a wobble signal and an LPP address to generate a recording clock signal and a recording timing signal. ing.

Next, the lead-in area of type (type) 2 is (2-1) a wobble and a land area on the outer peripheral side of a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area. Is a recording / reproducing area in which recording / reproducing is possible and has a land pre-pit LPP having information such as an address, and an initial zone where a differential push-pull tracking error signal is obtained.
e, system reserved zone, bu
fer zone0, RW-physical fo
rmat information zone, Ref
erence code zone, (2-2) boundary flag zone 1 (which may be absent) in which a code for determining whether the type is 1 or type 2 is recorded.
mboss zone1 (from a depth of about λ / 12,
(2-3) A pit area formed to have a depth of about λ / 4 and having a wobble and capable of obtaining a differential push-pull tracking error signal and a DPD tracking error signal. A read-only area from which a DPD tracking error signal composed of prepits having depth but having wobbles but no land prepits LPP can be obtained and from which a recording signal can be read, and having information relating to copyright protection and lead-in information.
control data zone (Readable
emboss without LPP), (2-
4) type (type) 1 or type (type) 2
Boundary where the code for determining whether
flag zone2 (may not be present), a boundary emb having a structure reverse to that of the intermediate region described above.
ossone 2 (from about λ / 4 depth to about λ /
(A pit area formed to have a depth of about 12 in which wobbles and LPPs are recorded (LPPs may be omitted), a differential push-pull tracking error signal and a DPD tracking error signal are obtained), 2-5) Unread, which is a read-only area in which a DPD tracking error signal having a depth of about λ / 12 and composed of a prepit having a wobble and a land prepit LPP is obtained and a recording signal cannot be read.
able embossone with LPP,
(2-6) A recordable / reproducible area which has a land prepit LPP having information such as an address in a land area on the outer peripheral side of a wobble and a groove area having a depth of about λ / 12, and is a recordable / reproducible area. The area is divided in the outer peripheral direction in the order of buffer zone 2 from which a push-pull tracking error signal is obtained, and dataarea for recording user content. Here, the start address of each area is shown at the upper right of each area. t
The operation at the time of recording of type (type) 2 is represented by Wr on the right side of FIG.
item mode, and the operation at the time of reproduction is indicated by R on the right side of FIG.
This is indicated by an ead mode. "recording" indicates a recording operation, "reading" indicates a reproducing operation, "seek" indicates a seek operation, or an operation of skipping a track.
Ead gen wclk indicates an operation of reproducing a wobble signal and an LPP address to generate a recording clock signal and a recording timing signal.

Boundary flag zone 1
The boundary flag zone 2 and the boundary flag zone 2 need not be located at this position, but the boundary zone 1 and the boundary flag zone 2 have the above-mentioned lead-in information so as to change the recording / reproducing method depending on the type (type) 1 or type (type) 2 of the disc. The control data zone and the address information of the LPP in the recordable area are embedded and recorded in advance, and the type of the disc to be recorded / reproduced is recorded.
e (type) 1 or type (type) 2 can be determined.

Next, type (type) 1 and type
Referring to FIG. 9, a case where this area is commonly reproduced and a case where this area is recorded on a (type) 2 disc will be described. FIG. 9 is a diagram for simplifying the expression of the format of FIG. 5 as a track position and explaining mainly the physical contents for recording and reproduction.

FIG. 9 shows an outer circumferential direction in the direction of each track from track number 1 to track number 9.
Corresponds to track number 1 of type 1
Each track of track number 2 has a land pre-pit LPP having information such as an address in a land area on the outer peripheral side of a groove area having a depth of about λ / 12. And an initial zone and system response where a differential push-pull tracking error signal is obtained.
rved zone, buffer zone 0, RW
-Physical format informat
ion zone, Reference code z
one, buffer zone1, linking
loss area. Wobble signals are arranged in all the regions in FIGS. Each track of track number 3 and track number 4 is approximately λ /
A DPD tracking error signal composed of prepits having a depth of about 4 and having no land prepits LPP is obtained, and a read-only area C in which a recording signal can be read out.
control data zone (Readable
emboss with LPP). DPD in which each track of track number 5, track number 6, and track number 7 has a depth of about λ / 12 and has prepits having land prepits LPP
Unreadable em which is a read-only area where a tracking error signal is obtained and a recording signal cannot be read.
boss zone with LPP. Recordable and reproducible information in which each track of track number 8 and track number 9 has a differential push-pull tracking error signal having land pre-pits LPP having information such as addresses in land areas on the outer peripheral side of the groove area Recordable / reproducible area (Data a
rea).

Next, the track of track number 1 of type 2 is a land area on the outer circumference side of a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area in the lead-in area. Is a recordable and reproducible area having a land pre-pit LPP having information such as an address, and is provided with a differential push-pull tracking error signal.
zone, system reserved zone
e, buffer zone 0, RW-physica
l format information zone
e, Reference code zone and the like. The track of track number 2 is an intermediate area. A read-only area in which each track of track number 3 and track number 4 has a depth of about λ / 4 and has a DPD tracking error signal composed of prepits without land prepits LPP and from which recording signals can be read. Control data zone (Readab
le emboss with LPP). The track of track number 5 is the intermediate area. Each track of track number 6 and track number 7 is
Land pre-pit LPP with a depth of about λ / 12
Unreadable emboss zone in a read-only area where a DPD tracking error signal composed of prepits having
with LPP. A recordable / reproducible area in which each track of track number 8 and track number 9 has a land push bit LPP having information such as an address in a land area on the outer peripheral side of the groove area and a differential push-pull tracking error signal is obtained. (Data area).

In this arrangement, when performing recording or reproduction, type (type) 1 or type (type)
2 needs to be determined. As a method of detecting the type (type) 1 or the type (type) 2, when the disc is inserted and the startup process is performed, the control data zone having the lead-in information is reproduced, and the type (type) is stored in this area. 1 or type
If (type) 2 is recorded, determination is made based on this value. This can be read by a recording device or a reproducing device in a similar manner. In another example of this example, bou
ndary flag zone1 and boundar
Since the type (type) 1 or the type (type) 2 is recorded as the LPP in the y flag zone 2, it can be determined by reading this value at the time of recording. This method can be applied when recording is performed by a recording device. This type of recording may be performed by any other method as long as it can be detected in the state of a disc on which no recording has been performed.

Now, when recording type (type) 1 in order from the track of track number 1 (Write Mode shown on the left side of FIG. 5), each of track number 1, track number 2, track number 8, and track number 9 is recorded. The track is a track to be recorded, and there are wobble frequency signals on both sides of the tracks in all areas as described above. Is controlled at a constant linear velocity and a recording clock signal is generated. Next, an LPP recorded on the land is detected, an address signal is generated, and recording is performed at a predetermined linking timing of this track based on the detected timing signal (record in the Write Mode shown on the left side of FIG. 5).
ing, Initial zone ~ Linking
loss area). Then, the recording is stopped at the linking timing at the address corresponding to the track of the track number 3, and the reproduction state (W shown on the left side of FIG. 5).
write mode).

The track of track number 3 is composed of reproducible pits in the recording area. Although there is no LPP signal, an address is detected from the reproducible pits and the reproducing operation is performed based on the address (see the left side of FIG. 5). Write Mod shown
reading in e, Control data
zone (Readable emboss wit
hout LPP)) This is performed up to the track of track number 4. Next, each of track No. 5, track No. 6, and track No. 7 is a track from which pit signals cannot be reproduced.
Since there is a P signal, the wobble signal and the LPP address are reproduced during reproduction of this track, and a recording clock and a recording timing are generated (Write Mod shown on the left side of FIG. 5).
e, reading gen wclk, Unr
eadable emboss with LPP),
Similarly, recording is started at the linking timing on the track having the track number of track number 8 and thereafter, and the subsequent recording process is performed (recording, buffer zone 2 to 2 in write mode shown on the left side of FIG. 5).
Data area). Here, type (type) 1
On both sides of the track, all tracks are symmetrical, each track of track number 2 and track number 3, each track of track number 4 and track number 5, and each of track number 7 and track number 8 The tracking error signal due to the differential push-pull at the track boundary can be continuously obtained with a certain amplitude difference.

As described above, since the boundary of the pit area can be continuously recorded, the RF signal can be continuously obtained at the time of the reproduction, and the processing at the time of the reproduction (the R signal shown on the left side of FIG. 5).
In the "Ead Mode", the tracking error is reproduced in order from the track of track number 1 to the track of track number 9 using the phase difference method (DPD) (differential push-pull may be used) (Rea shown on the left side of FIG. 5).
reading in d Mode, Initial
zone ~ Control data zone (R
eadable emboss without LP
P)). At this time, since the signals of the track Nos. 5, 6, and 7 cannot be reproduced, they are skipped (Read shown in the left side of FIG. 5).
Seek, Unreadable in Mode
emboss with LPP ~ buffer zo
ne2) Then, the tracks of track numbers 8 and thereafter are continuously reproduced (Rea shown on the left side of FIG. 5).
reading, Data ar in d Mode
ea).

Next, when recording type (type) 2 in order from the track of track number 1, the tracks of track number 1, track number 8, and track number 9 are tracks to be recorded. The track of track number 2 which is an intermediate area is a recordable track in type (type) 1, whereas the track of type 2 is a recordable track.
The reason is that the track of track number 2 has different lands on both sides of the track, and the wobble signal and LPP necessary for recording are different.
This is because even if a signal is recorded, the signal cannot be obtained at the signal amplitude or the offset level of the signal as in the previous track, and the recording clock or the timing signal may not be obtained accurately. .

Similarly, the track of track number 5 which is an intermediate area also has a different land depth on both sides of the track.
Even if the wobble signal and the LPP signal necessary for recording are recorded, an accurate signal may not be obtained at the signal amplitude or the offset level of the signal as in the previous track. Since a signal may not be accurately obtained, a recording clock or a timing signal may be accurately obtained on a track having a track number of track number 6 or later.

The recording process is performed in order (Writ shown on the right side of FIG. 5).
e Mode) will be described. In the track of track number 1, as described above, there is a wobble frequency signal on both sides of the track, and by detecting this frequency signal, a speed signal for rotating the disk is fed back to control the disk at a constant linear velocity. And a recording clock signal is generated. Next, an LPP recorded on the land is detected, an address signal is generated, and recording is performed at a predetermined linking timing of this track based on the detected timing signal (rewrite in Write Mode shown on the right side of FIG. 5).
cording, Initial zone ~ boun
Initiate the daily flag zone 1).

Then, the recording is stopped at the linking timing corresponding to the address corresponding to the track of the track number 2, and the reproduction state is set. The track of track number 2 is skipped because the recording area is composed of unreproducible or reproducible pits (Write M shown on the right side of FIG. 5).
The dashed line of recording in the mode, bou
ndary flag zone 2). The track of track number 3 has a recording area composed of reproducible pits and does not have an LPP signal.
(Tracks of Write M shown on the right side of FIG. 5)
reading, Control da in mode
ta zone (Readable emboss w
itout LPP)-boundary flag
zone 2).

Next, the track of track number 5 may not be able to reproduce the pit signal, and the LPP signal is a track that may not be accurately reproduced, so that it is skipped. Next, the tracks of track number 5, track number 6, and track number 7 are signals for which pit signals cannot be reproduced. Since wobble signals and LPP signals are present in this area, wobble signals are reproduced during reproduction of these tracks. The signal and the LPP address are reproduced to generate a recording clock and a recording timing (reading gen wclk, Unrea in Write Mode shown on the right side of FIG. 5).
Similarly, recording is started at the linking timing on the track having the track number of track number 8 or later, and the subsequent recording process is performed (rewrite in Write Mode shown on the right side of FIG. 5).
coding, buffer zone 2-Data
area).

Here, in the type (type) 2, the tracks 2 and 5 in which both sides of the track are intermediate areas are also asymmetric, and in the track at this boundary, the tracking error signal of the push-pull system shows the amplitude difference and offset. Although it occurs and recording or reproduction cannot be performed accurately, the tracking error signal by the differential push-pull method can be continuously obtained within a certain allowable range of the amplitude difference.

By arranging the areas in this way, the boundaries of the pit areas can be recorded continuously,
The F signal can be obtained continuously, and the processing during reproduction (FIG. 5)
(Read Mode) shown on the right side of (1) uses a tracking error as a phase difference method (DPD) (differential push-pull may be used) to sequentially reproduce tracks from track number 1 to track number 9. At this time, in type (type) 2, signals cannot be reproduced from the tracks of track number 2, track number 5, track number 6, and track number 7, so that the tracks are skipped (see, seek in Read Mode shown on the right side of FIG. 5).
Initial zone ~ boundary emb
oss zone 1, boundary flag
zone2-buffer zone 2), and then
Each track having track numbers 3, 4, and 8 and subsequent track numbers is continuously played back (reading, control data zone in Read Mode shown on the right side of FIG. 5).
e (Readable emboss withwithout
LPP) ~ boundary flag zone
2, Data area).

Further, suppose that type (type) 1 and ty
type cannot detect the type of pe (type) 2
(Type) If it is set to 1, or by mistake
The present invention is also effective when e (type) 2 is detected as type (type) 1. In other words, in this case, in the case of recording, the recording apparatus attempts to perform the recording process on the track with the track number 2, but with the track number with the track number 2,
Even if the wobble signal can be detected, the LPP cannot be detected accurately, so the recording is stopped halfway. Alternatively, the recording processing is performed while performing the complement processing of the LPP signal in the signal processing circuit. Even if all tracks of track number 2 have been recorded, when this track is reproduced,
Since a tracking error signal can be obtained from this area, a reproduction signal cannot be read from the track of track number 2, but continuous reproduction is possible without any problem. There is a possibility that the track with track number 5 cannot read the LPP signal, but since it is read from the next track, recording and reproduction can be performed without any problem.

FIG. 10 is a diagram for explaining a lead-in area and a data area of an information recording medium according to the third example. Buffer of type (type) 2 shown in FIG.
zone1 is unreadabl in FIG.
e emboss with LPP boundary
The difference is that flag 1 is set. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. This disk is ty
pe (type) 3 is assumed. Regarding the recording and reproducing operation of type (type) 3, Wr is shown on the right side of FIG.
It is indicated by item mode and read mode. For this operation, see unreadable emb
oss with LPP boundary fla
Since it is the same as type (type) 2 except for g1,
Although the description of the overlapping operation is omitted, the type (type)
The description of the operation different from 2 is as follows. unrea
double emboss with LPP bou
The region of ndaryflag 1 is unreadabl
e Emboss with the same as the LPP area, and a boundary flat in the LPP in this area.
The difference is that g1 has been written. In FIG. 10, buf
The place to be recorded in fer zone1 is unrea
Since the area is a double emboss area, the recording is ended in the preceding reference code zone, and the operation is switched to the reproducing operation. In addition, type
The (type) 1 is the same as the type (type) 1 shown in FIG.

FIG. 11 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fourth example. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 4 and the type (type) 5 shown in FIG. 11 are bo of the type (type) 2 shown in FIG.
unary emboss zone 1 and bound
The ary embosszone2 is changed to the ty shown in FIG.
Pe (type) 1 and type (type) 2 are arranged at the same address position. boundar
y embass zone 1 and boundary
The emboss zone 2 is, as described above, the FIG.
1 A region composed of embossed pits as shown in the control table shown on the right side, and type (type)
4, wobble and LPP are recorded.
In e (type) 5, wobble is recorded, but LPP may not be recorded. Alternatively, the LPP is an area that cannot be read accurately even if it is recorded.
The emboss pits in this area may or may not be able to reproduce data. type (type) 4 or type
e (type) 5 is identified by LPP or readable control data zone.
e is previously recorded in a read-only area such as e.

By adopting such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) in FIG.
Record until ng loss area (recordin
g) and switch to playback mode (reading),
readable emboss with reproduces a wobble signal from the LPP area, generates a clock for recording, generates an address signal from the LPP and generates a recording timing (reading gen wclk),
Next, record again from the buffer zone (recorder
ding). Note that the reproduction operation is the same as in the above-described example, and a description thereof will be omitted.

As described above, even in type (type) 4, t
The same recording / reproducing method can be used for type 5
Since it can be applied, there is an advantage that the design of the device becomes easy. However, as described above, type (type) 4
In the case of, the tracking signal is almost no problem with push-pull or differential push-pull,
In the case of (type) 5, the tracking signal has almost no problem in the differential push-pull, but in the push-pull, the boundary emboss zone 1 is used.
And it is difficult to pass continuously through the boundary emboss zone 2 and the type (type)
4 or type (type) 5 identification information by LPP or readable control data zone
By recording in advance in a read-only area such as e, it is possible to cope with each disc.

The disk type described in each of the above examples
When e (type) is classified, type (type) 1 and t
Since type (type) 4 belongs to the same group, type (type) 1 will be described as a representative in the following description. In addition, type (type) 2, type
Since (type) 3 and type (type) 5 belong to the same group, they will be referred to as type (type) in the following description.
2 will be described as a representative. With such a configuration, two different manufacturing methods of type (type) 1 and type (type) 2 are permissible, and a tracking error signal can be continuously obtained during recording and reproduction. DVD-ROs that can be played continuously without interruption during playback
M and DVD video playback devices
This is to increase the added value of D-RW.

In the above example, a bout consisting of a pit area of one track, which is an intermediate area between the read-only area and the recording area or between the read-only area and the read-only area.
ndary emboss zone1 and bounda
Although the dry emboss zone 2 is provided, it is a matter of course that the area may be two or more tracks.
As can be seen in FIG. 5, type (type) 1 and type
The difference between (type) 2 is negligible, and the boundary embo, which is the boundary area between the recording area and the read-only area,
boundary embos, which is a boundary area between ss zone 1, the first read-only area, and the second read-only area
s zone2 as a boundary area, an area which does not need to be recorded when an address cannot be detected accurately, or
If a region where a reproduced signal does not need to be accurately read out is defined, type (type) 1 and type (type) 2 can have a common format. The names used here are examples, and are not limited to the manufacturing method, the correction format, the disk structure, and the like.

FIG. 12 is a diagram for explaining a lead-in area and a data area of an information recording medium according to a fifth example. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 6 and the type (type) 7 shown in FIG. 12 are b of the type (type) 4 shown in FIG.
Bound ordinary emboss zone 1
In the case of type 1 (type), this area is a recordable groove area where the wobble and the LPP are recorded. Not embossed pit area and bound
The ary emboss zone 2 is a wobble and an LPP similar to the boundary emboss zones 1 and 2 shown in FIG. It is a good area. type
The identification information indicating e (type) 6 or type (type) 7 is LPP or readable cont
The data is recorded in advance in a read-only area such as a roll data zone.

If the area is defined as described above, the type
The (type) 6 and the type (type) 7 can have a common format. At this time, there are cases where this area is recorded and reproduction is performed. Therefore, if a wobble signal is recorded in advance in this area even if there is no LPP address signal, a spindle speed signal can be generated, and the LPP address signal can be generated. Can be recorded in a circuit-complementary manner. Actually, in the case of the recording of the boundary zone 1, in the case of type 6, as shown in the table, the latter half of the two ECC blocks is linked to the Linki.
ng Loss Area
In the case of type 7, the first half ECC block is
Recording is performed up to this point as ng Loss Area.

Also, boundary emboss z
For the same reason, if the wobble signal is recorded in advance in one2, continuous generation of a recording clock for recording and generation of a spindle speed signal can be performed by using type (type) 6 and type (type) 7. Thus, the recording / reproducing process can be performed while maintaining the compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal and an offset occurs in the wobble signal in a DC manner. However, if this offset signal is passed through a band-pass filter or the like, the wobble signal is Since the wobble signal can be continuously obtained without any loss or the wobble signal can be lost for a short time, this effect can be eliminated by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when performing recording / reproduction, and a method for manufacturing two discs is enabled, thereby contributing to the development and spread of such a format.

Incidentally, as is common to all the examples, b
ordinary embass zone1 or bo
The unary zone 1 is formed such that one round of the disk-shaped disk is formed as pits in the intermediate area, and the 2ECC block arranged as the intermediate area is an area slightly larger than one round. Therefore, several sectors or several sync frames of the latter half of the ECC block are readable areas in the same manner as the control data zone which is the next area. Since at least two sync frames are secured in this area, when an attempt is made to reproduce the control data zone, the reproduction signal P
By performing LL pull-in and sync detection, the control data zone can be accurately read from the beginning. Similarly, in the boundary emboss zone 2, the 2ECC block arranged as the intermediate area is an area slightly larger than one round. Therefore, several sectors or several sync frames of the latter half of the ECC block are areas in which the wobble signal and the LPP signal can be read out in the same manner as the next area, the unreadable emboss zone.

With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) in FIG. 12 are omitted from the description of the same processing as in the above example, as shown on the left side of FIG. Obtains information of type 6 or 7 recorded in the LPP or control data area. In the case of type 6,
The recording operation (Write mode) is boundary
Linking the last ECC block of zone1
Loss area and record so far (record
ding), switch to the playback mode (reading), and unreadable emboss with
A wobble signal is reproduced from the LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading gen wc).
lk) and then record again from the buffer zone (r
resume). In the case of type 7, the recording operation (Write mode) is boundary.
Link the last ECC block before zone1
ng loss area and record up to this point (rec
ordering), switching to a playback mode (reading), and unreadable emboss with
The wobble signal is reproduced from the LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading gen w).
clk), and then restart recording again from the buffer zone. In addition, temporarily LPP
Alternatively, even when the type 6 medium is recorded by the type 6 method assuming the type 6 without acquiring the type 6 or 7 information recorded in the control data area, the wobble signal is continuously obtained. Therefore, based on this signal, continuous recording can be performed even when an LPP signal cannot be obtained. In this case, if this area is reproduced, the recorded signal cannot be read, but 1
Since the information is track information and not important information area information, no trouble occurs. The rest of the reproducing operation is the same as in the above-described example, and a description thereof will be omitted.

FIG. 13 is a diagram for explaining the concept of the cutting state of the information recording medium according to the sixth example. Figure 1
3 has the same depth (position) in the bottom surface in the above description, whereas the sixth example has the pits in the intermediate region in FIG. The row region and the bottom surface of the guide groove region gradually become shallower at a predetermined inclination as going from the guide groove direction to the pit row direction, and the bottom surface in the pit row is again flush with the bottom of the guide groove. are doing. Modifications of the method for manufacturing in such a manner as compared with the conventional method are roughly performed as follows.

In the switching portion between the guide groove and the pit row whose bottom surface is on the surface of the glass master, a condition for cutting the guide groove and land prepit exposed to the surface of the glass master is used as an initial condition. The laser (light) A contains a wobble signal. The wobble signal was swept right and left by an optical polarizer so that the wobble signal had an amplitude of 15 nm on the resist disk. The laser beam intensity was set such that the width of the guide groove to be cut was 0.3 μm and the groove depth was about 30 nm (PA3). On the other hand, the laser (light) B was set to have a laser beam intensity (PB3) at which a desired land prepit was formed, and the depth of the land prepit to be cut was set to about 30 nm. Cutting was performed at a constant linear velocity. The turntable is equivalent to the track pitch during one rotation of the resist disc.
It was controlled to move at a constant speed from the inner circumference to the outer circumference of the resist board at 0.74 μm. Subsequently, each laser output was continuously varied while cutting the three track slopes. At this time, the laser (beam) A
Was controlled to reach a laser intensity suitable for recording a guide groove having a bottom surface not reaching the surface of the glass master. At this time, the bottom of the guide groove is not exposed to the surface of the glass master. The wobble signal has a laser beam oscillated left and right by an optical polarizer so as to have an amplitude of 15 nm on the resist disk. The width of the guide groove to be cut is 0.3 μm, and the laser beam intensity is such that the groove depth is about 30 nm. The laser (beam) B is controlled so as to continuously reach the laser intensity required for forming land prepits beside the guide groove.

Similarly, the switching portion between the pit row and the guide groove having the bottom surface on the surface of the glass master is suitable for recording a guide groove having a bottom surface where the laser (beam) A does not reach the surface of the glass master as an initial condition. In this case, the laser intensity is controlled so as to continuously reach a laser intensity suitable for recording a guide groove exposed to the surface of the glass master while cutting the three-track inclination. Similarly, the laser (beam) B light is set so that the depth of the land pre-pit to be cut during the cutting of the three track inclination is set to be about 30 nm from the laser light intensity at which the desired land pre-pit is formed. Continuously.

As described in the above example, the track in the recordable intermediate area having the inclination of the disc manufactured by the method described above may be slightly moved by the push-pull method as the tracking method or the differential push-pull method. Although this offset may occur, recording and reproduction can be performed on this track. Therefore, since recording cannot be performed by the push-pull method as in the above-described example, it is possible to provide a recordable area without having to be configured with pre-pits. Further, after recording in this area, stable tracking can be performed with little occurrence of offset or the like by a differential phase detect (DPD) method. In the above example, an offset or the like may occur in the differential phase detect (DPD) method depending on whether the intermediate area including the pit area is overwritten or depending on the pit shape of the intermediate area. Then, the occurrence of this problem can be solved. Also, since the wobble signal and the LPP address signal can be prepared in advance in this intermediate area, the recording operation of the signal to be written can be performed almost exactly, and the reproduction operation of the reproduction signal is also stable. Can be performed.

FIG. 14 is a diagram for explaining a lead-in area and a data area of an information recording medium according to the sixth example. Also in this case, a wobble signal is recorded in all areas, and a wobble signal can be obtained in all areas. The type (type) 6 shown in FIG.
The type (type) 8 shown in FIG. 14 is substantially the same as the type (type) 6, and the type (type) 8 shown in FIG.
(Type) In the boundary zone 1 of 7,
This area is an embossed pit area where wobble can be recorded but LPP is not recorded. On the other hand, in type (type) 8, a recording in which wobble and LPP are recorded is inclined as described above. A possible groove area, and even if the LPP of this area
This is an area where the PP does not need to be accurately read. boun
The daily emboss zone 2 is a wobble and an LPP similar to the boundary emboss zone 2 shown in FIG. 12, and the embossed pit area is a recorded emboss pit area.
This is an area where the PP does not need to be accurately read. type
The identification information indicating that it is (type) 6 or type (type) 8 is LPP or a readable contr.
ol data zone or the like is recorded in advance in a read-only area. For example, the identification information is set to Disc Phys of LPP information.
0: b for Media type 3 (media type) of ical code
No boundary 1: Defined as bounded

If the area is defined as described above, the type
The (type) 6 and the type (type) 8 can have a common format. At this time, when this area is recorded and reproduced, an LPP is temporarily stored in this intermediate area.
Even if the address signal cannot be detected from the wobble signal,
A spindle speed signal can be generated, and recording can be performed by complementing an LPP address signal in a circuit manner. Actually, in the case of the boundary zone 1 recording,
EC of 2F1F0h for both type 6 and type 8
The recording is performed so far with the C block as a Linking Loss Area.

Also, boundary emboss z
For the same reason, if a wobble signal is recorded in advance in one2, a recording clock for recording can be continuously generated, and a spindle speed signal can be generated, and the type (type) 6 and the type (type) 8 can be generated. Thus, the recording and reproducing process can be performed while maintaining the compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal and an offset occurs in the wobble signal in a DC manner. However, if this offset signal is passed through a band-pass filter or the like, the wobble signal is Since the wobble signal can be continuously obtained without any loss or the wobble signal can be lost for a short time, this effect can be eliminated by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when performing recording / reproduction, and a method for manufacturing two discs is enabled, thereby contributing to the development and spread of such a format.

With such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) in FIG. 14 are omitted from the description of the same processing as in the above example, as shown on the left side of FIG. However, information of type 6 or 8 recorded in the LPP or the control data area is acquired, and in the case of types 6 and 8, the recording operation (write mode)
link of the last ECC block of ary zone1
ing loss area and record up to this point (re
cording), switching to the playback mode (reading), and unreadable emboss wit
h Reproduce a wobble signal from the LPP area, generate a clock for recording, generate an address signal from the LPP, generate a recording timing (reading gen)
wclk), and then resume recording from bufferzone. Also, in the case where recording is performed in the boundary zone 1 in type 8 and the push-pull method is used as a tracking error, an offset signal within an allowable range is generated in the tracking error signal. By measuring a value of the offset and controlling to cancel the offset according to the value, recording can be performed more accurately. Also, if L
Even when the type 6 medium is recorded by the type 6 method assuming the type 6 without acquiring the type 6 or 8 information recorded in the PP or control data area, the wobble signal is continuously obtained. Therefore, based on this signal, continuous recording can be performed even when an LPP signal cannot be obtained.

The boundary zone described here
The expressions e1 and e2 are expressed as described above because they are regions sandwiched between regions having substantially different depths, but may be expressed as a normal data region as a different expression method. In particular, the difference between Type 6 and Type 8 is slight, and is expressed as a normal data area. As a characteristic of the data in the area, for example, the jitter of the reproduction signal of Type 6 is 8% or less. Is less than 10% or the error rate of the type 6 LPP reproduced signal is a
% Or less, the error rate of the type 8 LPP reproduction signal is b% or less, or the offset of the type 6 tracking signal is c% or less, but the offset of the type 8 tracking signal is d% or less. The difference between the existing data may be defined as the type difference. Further, as a different expression method, the standard value defined for the normal data area is not accurately defined for this area for both Type 6 and Type 8, so that the two types are commonly expressed. There is a way. In this example, b
Although the area of the boundary zone 1 is configured to gradually change the depth, the boundary zone 2 may be configured so as to gradually change the depth.

In the seventh example, a case will be described in which what is equivalent to the contents of the example of FIG. 14 is defined as the type 1 type of FIG. The description of FIGS. 14 and 5 has already been made and is omitted here, but the differences are as follows. That is, when the difference is considered in a large field of view, the type (type) 6 shown in FIG.
14 is substantially the same as the type (type) 6 shown in FIG. 12 and the type (type) 1 shown in FIG. 5 except that the name of the area is changed, and the type (type) shown in FIG. On the other hand, if the boundary zone 1 is a recordable groove area where the wobble and the LPP are recorded as described above, the type 1 b
Since it is the same area as the buffer zone 1,
ferzone1 can be defined. Similarly, the boundary emboss zone shown in FIG.
Since the wobble and LPP are embossed pit areas where e2 is also recorded, unreadable emb
oss with the same area as the LPP area,
unreadable emboss with LP
It can be defined as a P region.

According to this definition, type 6 and type 8 in FIG. 14 can be the same as type 1 in FIG. The type 6 and type 8 described in FIG.
Does not exist. However, two boundary areas where two boundary zones existed as the positional relationship in FIG. 14 (the boundary track is one track near the boundary of a track in a recordable area or a read-only track composed of pits) Or several tracks), as described above, among the tracking error signals, the push-pull tracking error signal may be different from the amplitude level or offset level of the normal signal area.

The amplitude of the push-pull tracking error signal is originally different between the recordable area and the read-only area, and is defined in each area. In the boundary area, as shown in FIG. The amplitude of the push-pull tracking error signal in the recordable area when crossing the track at the time of tracking off is defined as an upper peak value P1 and a lower peak value P2 based on the center voltage. Is defined as an upper peak value P3 and a lower peak value P4 based on
3 / (P1 + P2)> 0.2 and P4 / (P1 + P2)
> 0.2. The numerical value of 0.2 is obtained even when the amplitude of the push-pull tracking error signal is reduced.
This value is necessary so that control such as tracking does not become unstable when recording or reproducing this area. In addition,
Since the value of 0.2 varies depending on the measurement method or the like, the value of 0.2 is preferably in the range of about 0.15 to 0.3. For example, in a recordable area other than the boundary area, the value of the offset amount of the amplitude of the push-pull signal is defined using a mathematical formula (P1-P2) / (P1 + P2) as a standard of asymmetry. When an attempt is made to define a boundary region using this equation, as shown in FIG. 15, when the amplitudes of P3 and P4 are symmetrical and the amplitudes are extremely small,
Although the expression of (P1-P2) / (P1 + P2) is satisfied, the tracking servo may become unstable. On the contrary, as shown in FIG. 15, the amplitudes of P3 and P4 are symmetric,
Even if the amplitude is small in a range where the tracking servo is stable, the disc becomes unsatisfactory due to the value of (P1−P2) / (P1 + P2), which causes a deterioration in the manufacturing margin of the disc. Therefore, introducing this new formula to define this area is most preferred for this type of disc.

With such a format, the recording operation (Write Mode) and the reproduction operation (Read Mode) of FIG. 5 are performed as shown on the left side of FIG. 5, but it is determined that the disc is of this type. At this stage, the recording operation (Writemode) is first performed by bo.
l of the last ECC block in the secondary zone1
An inking loss area is recorded up to this point. However, as described above, the area near this linking loss area is a boundary area, and when the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks. Recording control can be stably performed by changing the gain or offset control value during tracking control only when recording an area. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Next, the mode is switched to a reproducing mode (reading), the control data area is reproduced, and the unreadable emboss is reproduced.
The wobble signal is reproduced from the with LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading).
gen wclk), and then resume recording from the buffer zone. From this control data area, unreadable em
The boundary between the bus with LPP areas is also a boundary area. At this time, similarly, when the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks. Recording control can be performed stably by changing the gain and offset control value during tracking control only when reproducing. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Next, the reproduction operation (Read Mode) in FIG.
When it is determined that the disc is of this type, first, when reproducing the control data area, the bound
link of the last ECC block of ary zone1
It is a usual method to move to the vicinity of the ing loss area and reproduce the first area of the control data area. In this case, as described above, this linking is performed.
The area near the loss area is a boundary area,
If the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from other tracks, so by changing the gain and offset control value during tracking control only when reproducing this area Passing can be achieved by performing stable recording control. Further, the offset level of the tracking error signal in this area may be measured in advance, and the control value may be changed according to the learned result. Since this area is recorded as information having no meaning such as 0 data, even if the reproduced data has an error, it can be skipped. After the control data area is reproduced and necessary lead-in information and information on copy protection are obtained, the control data area is moved to the data area and the content is reproduced.

Note that the manufacturing method, configuration,
The name is an example, and the present invention is not limited to a manufacturing method, a correction format, a disk structure, or the like.

[0105]

According to the present invention, near the boundary between the information recordable area and the first read-only area, the recording / reproducing signal characteristics are improved and an excessive offset signal is generated in the tracking error signal. In addition, there is an advantage that a problem such as a decrease in trackability at the time of recording due to lack of a tracking error signal or the like does not occur. In addition, there is an advantage that recording can be performed without any problem even with discs of different types.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an example of an information recording medium.

FIG. 2 is a diagram for explaining that data to be recorded on an information recording medium is divided into ECC blocks.

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

FIG. 4 is a diagram showing a physical format of one sector in a DVD-RW which is an example of an information recording medium.

FIG. 5 is a diagram for explaining a lead-in area and a data area of the information recording medium.

FIG. 6 is a diagram for explaining an information recording medium of a second example.

FIG. 7 is a diagram for explaining an example of a cutting state in the information recording medium.

FIG. 8 is a diagram for explaining another example of a cutting state in the information recording medium.

FIG. 9 is a diagram for explaining a positional relationship between recording and reproduction operations related to the present invention.

FIG. 10 is a diagram for explaining a lead-in area and a data area of an information recording medium of a third example.

FIG. 11 is a diagram for explaining a lead-in area and a data area of the information recording medium of the fourth example.

FIG. 12 is a diagram for explaining a lead-in area and a data area of an information recording medium of a fifth example.

FIG. 13 is a diagram for explaining another example of the cutting state in the information recording medium of the sixth example.

FIG. 14 is a diagram for explaining a lead-in area and a data area of an information recording medium of a sixth example.

FIG. 15 is a diagram for explaining the amplitude of the tracking error signal of the seventh example.

[Explanation of symbols]

 PA, PB, PM Pit train P1, P2 Read-only area Area 1 Recording / playback area

 ──────────────────────────────────────────────────続 き Continuation of the front page (31) Priority claim number Japanese Patent Application No. 2000-211615 (P2000-211615) (32) Priority date July 12, 2000 (July 12, 2000) (33) Priority claim country Japan (JP)

Claims (1)

[Claims] 1. An information recordable area which is formed from a spiral or concentric information track, in which a frequency signal and an address signal are recorded in advance from an inner periphery of the information track, and a signal to be reproduced are recorded as pits. An information recording medium having a first read-only area in which a frequency signal is recorded in advance, and a second read-only area in which a signal to be reproduced is recorded as pits and in which a frequency signal and an address signal are recorded in advance. In the vicinity of the boundary between the information recordable area and the first read-only area, the tracking error signal near the boundary has an amplitude in both directions from the center of the amplitude of the tracking error signal of the information recordable area. An information recording medium recording apparatus for recording information on an information recording medium defined as a ratio of the amplitude of the tracking error signal, Tracking means for performing tracking based on the amplitude of a tracking error signal in the information recordable area and the first read-only area to enable continuous reproduction near the boundary of the information recordable area; Information, comprising: address management means for managing an address of a possible area; and recording means for recording information based on the address signal up to a boundary between the information recordable area and the first read-only area. Recording medium recording device.