JP3391387B2 - Information recording medium and information recording medium reproducing method - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, a high density recording type optical disk such as a DVD-RW which is compatible with a DVD video and can be recorded a plurality of times (hereinafter, may be simply referred to as a recording type optical disk).
In (1), the content protected by copyright and the content not protected by copyright must be discriminated from each other so that the illegal copying (recording and reproduction) of the content is not performed. A DVD video is a read-only disc, and copyright information that prohibits copying of content is recorded in a predetermined area (information area related to copyright protection such as CSS key) of the disc by a CSS (content scramble system). There is. Then, a system for preventing illegal copying is adopted, in which the DVD video reproducing apparatus reads out information regarding copyright protection such as the CSS key and reproduces the content using the information regarding copyright protection such as the CSS key. ing.

[0003]

A high-density disc in which DVD video contents are recorded together with information relating to copyright protection by the above-mentioned high-density disc recording device is used as a DV.
When the information is reproduced by the D-video reproducing apparatus, there is a possibility that the information regarding the copyright protection may be read out. Therefore, the content of the copy-protected DVD video can be reproduced. It had a problem that it could not be sufficiently protected.

[0004]

In order to solve the above problems, the present invention provides an information recording medium and an information recording medium reproducing method having the following configurations (1) and (2) . (1) An information recordable area formed from a spiral or concentric circular information track, in which a frequency signal and an address signal are recorded in advance from the inner circumference of the information track, and a signal to be reproduced is recorded as a pit, An information recording medium having a first reproduction-only area in which a frequency signal is recorded and a second reproduction-only area in which a signal to be reproduced is recorded as pits and a frequency signal and an address signal are recorded in advance. , Tracking the boundary region between the information recordable region and the boundary region between the first read only area and said first read only area and said second read only area
Tracking error signal at the time Nguofu the tracking error signal when the tracking off of the information recording area
When the maximum amplitude of the signal is A,
Maximum in both directions from the center of maximum amplitude of the locking error signal
The amplitudes B1 and B2, respectively, are B1> 0.2 * A and B
An information recording medium characterized in that the range is 2> 0.2 * A. (2) Information recording for reproducing the information recording medium according to claim 1.
In the medium reproducing method, the address signal of the information track is
According to the number, the information recordable area, the first reproduction only
Tracking error signal between the area and the second read-only area
Track the boundary area continuously based on the signal amplitude.
Information recording medium having a step of
Body regeneration method.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a recordable disc such as a DVD-RW, a predetermined area (information area regarding copyright protection) in which information regarding copyright protection of a DVD video is recorded in a normal state. In the embossed pre-pit, record information about copyright protection information,
The copyright protection information will be processed later so that it cannot be overwritten. As a result, when the content of the DVD video is not recorded on the DVD-RW by the high-density type disc recording apparatus, and the content is recorded on the DVD-RW, and is reproduced by the DVD video reproducing apparatus, the content is recorded. Since the copyright protection information cannot be read, the DVD video content cannot be played. As a result, it is possible to protect the copyright of the copy-protected DVD video.

The recordable optical disk includes conditions for specifying the light quantity of the recording laser, recorded information such as the kind of the disk, the manufacturer's name, etc., or address information for finding a specific position of the recordable guide groove, and the disk. The frequency information used for the rotation speed control is recorded in advance at specific positions.

This recording type optical disc is designed so that it can be used (recorded) immediately after it is purchased. This can be done 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 disc master, and the disc substrate is molded by using the metal master die made of this disc master, whereby the above-mentioned recording mold is formed. It is recorded in a specific position (such as the lead-in area of the disc) on the disc substrate of the optical disc. In addition, when the above-mentioned recorded information is not recorded when cutting the disc master,
At the time of shipment after the above-mentioned recordable optical disc is produced,
By using the recorder for recording the already-recorded information described above, additional recording is performed at the above-mentioned specific position as pits or marks.

(2) On the other hand, the above-mentioned address information is recorded as LPP in a specific portion of the guide groove with a wider width. (3) Furthermore, the above-mentioned frequency information is recorded as the frequency of the wobble that slightly fluctuates the guide groove in the radial direction.

Recording of the above-described recorded information, address information, frequency information, and guide groove at a specific position on the disk substrate is specifically performed as follows. First, a photosensitive resist is uniformly applied on a glass plate that has been smoothly polished to a thickness corresponding to the depth of the guide groove. When the above-mentioned recording type optical disk is a DVD-RW disk, the photosensitive resist is uniformly applied on the glass disk to a thickness of about 30 nm.

Next, the glass disk (resist disk) on which the photosensitive resist is uniformly applied in this manner is carried to a cutting device. The cutting device is equipped with a laser beam control device that makes a cutting laser beam emitted from a light source into intermittent light or slightly oscillates 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 laser light or a laser beam for minute vibration in the radial direction, the above-mentioned recorded information is recorded.
Address information and frequency information are recorded at their specific positions.

Here, two cutting laser beams are used, one of them is used as continuous light to form a guide groove, and the other is intermittently formed to form an LPP. In addition, the previously recorded information is recorded as a pit at a specific position (lead-in area or the like) by making the cutting laser beam for forming the guide groove intermittent light.

Thus, after cutting the resist board,
The resist disk is developed, and the shape information (the previously recorded information, the address information, the frequency information, the guide groove) is formed as the shape change.
Is deposited. Then, a conductive thin film is coated on the developed resist board, and the above-mentioned shape information on the resist board is transferred onto the plating board by electroplating. This plating machine is processed into a desired size to form a metal mold, and an injection molding machine equipped with this metal mold is used to transfer the shape information described above as a shape change on a plastic substrate, The disc substrate of the above-mentioned recording type optical disc can be obtained.

A portion on the disk substrate where the above-mentioned shape change is transferred is called an information surface. A functional film for recording is formed on this information surface, and various post-processing thereafter. A recordable optical disc is created through the steps. By the way, in the disc substrate obtained by injection molding using the above-mentioned metal matrix, the guide groove and the pit have the same depth over the entire disc substrate.

As described above, since the guide groove of the recordable optical disc is formed to a depth necessary for the tracking guide during recording, it is intended to maximize the signal from the record mark recorded during reproduction. Then, there arises a problem that the reflectance decreases 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 used in a rewritable DVD-RAM disk, in order to reduce crosstalk between lands (between the guide grooves) and tracks between the grooves (guide grooves), the guide grooves are allowed within the allowable range. Although the depth is deeper, generally the depth of the guide groove is generally made shallower than the depth (1/8 wavelength of the reproduction wavelength) at which the guide signal from the guide groove is most efficiently extracted. Target. Then, the tracking operation to the guide groove is performed by the push-pull method.

On the other hand, a DVD-R which is a reproduction-only disc
In the OM disc, the pit depth is set near the depth at which diffraction by the laser light is efficiently performed so that a reproduction signal as large as possible can be obtained (1 / the reproduction wavelength).
(Around 4 wavelengths). For this reason, in the tracking operation, the push-pull method for the pit train cannot obtain a sufficient signal required for tracking, and therefore the tracking is performed by the phase difference method.

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

The following two methods (1) and (2) can be considered as methods for providing the guide groove and the pit having different depths on the disk substrate of one recording type optical disk.

(1) As a first method, as shown in FIG. 8 , a cutting laser beam (for convenience, laser A is used for forming pits and guide grooves when cutting the resist board). The output of (1) is changed to form a depth convenient for pit reproduction with one output, and a shallow groove convenient for recording the guide groove with the other output. Is. However, in this cutting method, the bottom surface of the shallow guide groove does not reach the glass master disk under the resist, so that the bottom surface of the guide groove is determined not by the glass master disk but by the output distribution of the laser A. Therefore, 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 as 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 and reproduction are significantly deteriorated.

In FIGS. 7 and 8 and in the following description, "LP
“P” indicates “land prepits” formed on the land, and for convenience, the laser B is described as a laser light output for forming the land prepits.

(2) Next, as a second method, a cutting laser beam (laser A) for forming pits and guide grooves when cutting the resist board as shown in FIG. 7 , This is a method of using another cutting laser beam (laser B) for forming land prepits. A pit and a guide groove having the same depth are formed by using the laser A having a constant output (each bottom surface of the pit and the guide groove reaches the glass master disk under the resist). Further, it is a method of exposing the resist adjacent to both ends of the guide groove to an arbitrary height using the laser B and adjusting the relative depth of the guide groove. With this method, the bottom of the guide groove will be the surface of the glass master, and the bottom of the guide groove will have a flat shape. You can

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

As described above, when a pit row having a depth convenient for reproduction and a guide groove having a depth convenient for recording / reproduction are both present in one recording type optical disc, the guide groove In order to obtain sufficient recording / reproducing characteristics, it is desirable that the bottom surface of the guide groove is designed to be flat so that the bottom surface of the glass master disk is placed. Then, when the portion where the pit row is switched to the guide groove and the portion where the guide groove is switched to the pit row is being reproduced, it was found that there is a recording device in which the pit signal is missing or the push-pull type tracking of reproduction is disturbed at the switching portion. . The cause is that the recording device is switched from the guide groove to the pit row, and the signal of the pit row is affected by the adjustment of the resist thickness of the adjacent guide groove, and the signal cannot be correctly extracted, and the pit row and the guide groove are adjacent to each other. The signal information of all the pit strings was missing. The recording device whose tracking is disturbed in this way is
At the switching part from the pit row to the guide groove and from the guide groove to the pit row, the tracking control signal becomes an abnormal value and tracking is lost, and the playback track position moves for several tens of tracks or more, and recording / playback from the desired location. There were things that wouldn't be possible.

As described above, in the case of a single recording type optical disc, in order to obtain a sufficient reproduction signal by recording / reproducing in the guide groove and record information that cannot be rewritten in the pit row, It is necessary that the groove depth of the groove and the pit depth of the pit row are optimal depths, and both the bottom of the guide groove and the bottom of the pit are flat on the surface of the glass master, and both recording and reproduction are performed. There has been a demand for a disk which is excellent in characteristics and is capable of recording / reproducing even if there is a lack of a pit signal at the switching portion between the pit and the guide groove, and which is free from any disturbance in the tracking signal.

Therefore, according to the present invention, in particular, the guide groove formed on the disk substrate and the bottom surface of the pit row are both flat on the same plane, and the switching from the pit row to the guide groove or from the guide groove to the pit row is performed. An intermediate area consisting of a pit row whose height changes from the bottom surface to the side surface of the guide groove and the height from the bottom surface to the side surface of the pit row is provided in this part, and this intermediate area is tracked by the differential push-pull method. By reproducing by the method or phase difference method, good reproduction information from the pit row for reproduction only,
Good reproduction information can be obtained together from the recording / reproducing guide groove, and optimal tracking characteristics can always be obtained even in an unrecorded area, and optimal tracking characteristics can always be obtained even in a recorded area. An object of the present invention is to provide an information recording medium capable of stably reproducing copyright protection information in a pit string exclusively for reproduction and recording a content based on this information.

The information recording medium of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an enlarged sectional view for explaining a first embodiment of an information recording medium of the present invention, and FIG. 2 is a view for explaining that data to be recorded on the information recording medium of the present invention is divided into ECC blocks. FIG. 3 is a diagram for explaining that ECC block data is recorded in a predetermined area of the information recording medium of the present invention in sector units, FIG.
Is a DVD-RW which is an embodiment of the information recording medium of the present invention.
5 shows a physical format of one sector in FIG.
6 is a diagram showing a lead-in area and a data area of the information recording medium of the present invention, FIG. 6 is an enlarged sectional view for explaining a second embodiment of the information recording medium of the present invention, and FIG. 7 is a cutting state in the information recording medium. FIG. 8 is a diagram for explaining one example, and 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 an embodiment of the information recording medium of the present invention, and this DV
Although recording information on the D-RW will be mainly described, it goes without saying that the present invention can also be applied to other recordable CD-RW, DVD + RW, high-density optical discs such as next-generation DVDs.

Embodiments of the invention are described in A. “Embodiment of recording format”, B. The description will be given in the order of “embodiment of the disk”. A. "Embodiment of Recording Format" First, "embodiment of recording format" will be described. First, a general physical format when recording record information on a DVD-RW and an error correction process on the record information (lead-in information) will be described with reference to FIGS.

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

Generally, the record information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. 2 (A). Then, in one data sector 20, the ID information 21 indicating the start position of the data sector 20 and the ID information 2 are displayed from the beginning.
ID information error correction code (I
ED) 22, spare 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 configured by a plurality of continuous data sectors 20.

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

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

Next, the correction block 34 of 192 rows described above.
Are arranged in the vertical direction, this time, the correction block 34 of the 192 rows is divided vertically in the vertical direction from the beginning, and 16 ECCs are added 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 portion of the correction block 34.

By the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. 2 (B). 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 actual data recorded in the 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 1st row and 0th column, and “D190.
170 "indicates 1-byte data arranged in the 190th row and the 170th column. Therefore, the ECC inner 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 replaced with the ECC inner code 31 and E.
The configuration including both of the CC outer codes 32 is as shown in FIG.
Since the ECC inner code 31 corrects the data arranged in the horizontal (horizontal) direction in (B), and the ECC outer code 32 corrects the data arranged in the vertical (vertical) direction in FIG. 2B. 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 error correction processing is configured to be more powerful than the error correction processing used in a conventional CD (Compact Disk) or the like.

More specifically in this respect, for example,
One correction block 34 (as described above, one row of ECC
Data including 182 bytes in total including the inner code 31 is continuously recorded on the DVD-RW. ) Is up to 5 bytes, it can be corrected even if it is destroyed by scratches, etc., but if all the columns in 6 bytes or more are destroyed by scratches on the DVD-RW, it can be corrected by the ECC internal code 31. Disappear. However, even if all the rows are destroyed due to scratches, etc., when viewed from the vertical direction,
There is only 1 byte of data destruction for one row of ECC outer code 32. Therefore, if error correction is performed using the ECC outer code 32 of each column, even if all of the one correction block 34 is destroyed, correct error correction can be performed and accurate reproduction can be performed. However, considering the occurrence of acquired scratches and the like, if the scratch in a row (horizontal) becomes large, it also leads to an error in the next row in the vertical direction (horizontal), so it is needless to say that it should be minimized. 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.
The data sector 20 configured to 0 is a DVD
-How to be recorded in the RW will be described with reference to FIG. Note that 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 arranged in a row in the horizontal direction for each correction block 34 and are interleaved to be divided into 16 recording sectors 40. At this time, one recording sector 40 has 2366 bytes (3
7856 bytes ÷ 16) information is included in the data sector 20 and the ECC inner code 31 or E.
The CC outer code 32 is mixed. However, the 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
3 is divided into data 41 of 91 bytes each, as shown in FIGS. 3B and 3C, and a sync H is added to each of them.
After that, the recording sector 40 in this state is
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. The amount of information in one sync frame 42 is 91 bytes x 8 x (16/8) = 1456 bytes, and this sync frame 42 is DV in a continuous form.
Information is written on 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. That is, the horizontal row consists of 172 bytes of data, 10 bytes of PI, and 4 bytes of sync, which are 186 bytes, and 12 rows of vertical columns, plus 13 rows of one 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, if 8-16 demodulation and deinterleaving are performed when the information is reproduced (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 strong error correction as described above can be performed to reproduce the information most accurately. Information relating to copyright protection (for example, a media key block) located in the lead-in information area is recorded as a part of such ECC block data.

B. [Embodiment of Disc] A characteristic intermediate area in a recordable optical disc, which is an example of the information recording medium of the present invention, is shown in FIG. 1 as a first embodiment.
A second embodiment is a recording-type optical disc having a disc substrate formed on the basis of the resist disc shown in FIG. 6, which is a reproduction-only region (regions P1 and P2) in which pit rows PA and PB are formed and a guide groove. 1 is formed between the recording / reproducing area (area 1), the reproduction-only area (area P1) and the reproduction-only area (area P2), or the reproduction-only area (area P).
1) is a recording type optical disc having an intermediate region formed between the recording / reproducing region (guide groove 1).

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

The depth (optical depth) of the pits PM with respect to the bottom surface of the pit row PM in the intermediate region is, for example, as shown in FIG. 1, the depth of the land (optical depth) on the reproduction-only region (region P1) side. From the depth of the land in the area P1 to the bottom surface (the glass master side) of the pit row PM, the depth a in FIG. 1, from the depth of the land in the reproduction-only area (area P2) (optical depth, pit row) The depth of the land in the area P2 with respect to the bottom surface of the PM (glass master side), the depth b in FIG. 1, is reduced, and the depth of the pit PM with respect to the bottom surface of the pit row PM in the intermediate area (optical 6, the depth of the land in the read-only area (area P1) side (optical depth, the depth of the land in the area P1 with respect to the bottom surface (glass master side) of the pit row PM) as shown in FIG. Now, from the depth c in FIG. 6, from the recording / reproducing area (guide groove 1 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.

By the way, as described above, even in the case of a recording type optical disc, a disc in which a sufficient reproduction signal can be obtained by recording / reproducing in the guide groove and information which cannot be rewritten can be recorded in the pit row is used. It is necessary that the groove depth and the pit depth of the pit row are optimal depths, respectively, and both the bottom of the guide groove and the bottom of the pit are on the surface of the glass master, which is excellent in recording / reproducing characteristics, and It is necessary for the disk to have no pit signal loss and no tracking signal disturbance in the switching portion of the guide groove.

The present invention will be described below with reference to the drawings. 1 and 6 are views for explaining a cutting state of an optical disk master according to the present invention. In the present invention, the groove depth of the guide groove and the pit depth of the pit row are designed to be different by exposing the resist of the guide groove, and the bottom surface of the guide groove and the pit row depth is formed by the glass master surface. Then, a recording type optical disc is proposed in which an intermediate area for changing the height of the guide groove is provided by changing the resist exposure laser output at the portion where the pit row is changed to the guide groove and the guide groove is changed to the pit row. 1 and 6, differential push-pull and DPD (differential phase detect) in the intermediate area
It is possible to obtain a signal in the range of the amplitude difference and offset level in which the tracking error signal of (1) is allowed.

As a result, the pit signal adjacent to the guide groove in the switching portion between the pit row and the guide groove is not significantly affected by the resist exposure due to the adjustment of the guide groove resist thickness, and the pit shape is not missing or missing. It was confirmed that the recorded information can be accurately read and the recorded information can be accurately recorded in the recording area.

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

A glass plate having a smooth surface is prepared, and a resist is applied to the surface of the glass plate to a depth corresponding to the depth having the 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 deflector for slightly swinging the laser beam right and left and an optical modulator for changing the laser beam intensity are sequentially provided.

As shown in FIG. 1 or 6, the guide groove 1 having a bottom surface on the surface of the glass master disk on the resist disk R has a laser beam intensity suitable for recording the guide groove using the laser (beam) A ( Recorded in PA1). At this time, the bottom surface of the guide groove 1 is exposed up to the surface of the glass master. Guide groove 1
Is slightly wobbled at a predetermined frequency. Further, the laser beam B is required in the guide groove 1 because there is a resist thicker than the resist thickness necessary for forming an appropriate guide groove depth beside the guide groove portion (between the guide groove 1 and the guide groove 1, a land). Laser intensity (PB
Record in 1). Further, the laser light intensity necessary for land prepit formation is output during land prepit recording.

At this time, a pinhole or the like is inserted on the beam expander 9 for guiding the laser (beam) B, and the laser (beam) B reduces the beam system introduced into the objective lens 12 and collects it on the resist plate. It is also possible to incorporate a device for enlarging the spot of the laser (beam) B that emits light, for example, a device for exposing one track width. At this time, the laser (beam) B may 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. The guide groove 2 is exposed with a laser light intensity (PA3) suitable for recording. At this time, it is desirable that the bottom surface of the guide groove 2 is exposed to the surface of the glass master disk, but it is not particularly specified. Also, laser (beam) B
Next to the guide groove part (between the guide groove and the land)
Has the same resist thickness as that of the guide groove 1 (region 1), and the pit row PB (region P
2) The laser light intensity (PB3) is set so that a resist having a required thickness remains in the guide groove 1 adjacent to the pit row PB (region P2) and reaches the same resist thickness as the pit row PB (region P2). It is formed with light intensity. Further, the laser light intensity necessary for land prepit formation is output during land prepit recording. At this time, the laser (beam) B may be slightly wobbled at a predetermined frequency.

Next, the laser (beam) A is used to expose the area P1 having the pit row PA where the identification information of the recording type optical disk is pits and suitable for recording the pits and in the entire resist thickness direction. Laser light intensity (PA2) suitable for recording is recorded and the surface of the glass master is exposed. At this time, the pit train PA is slightly wobbled at a predetermined frequency. Wobble may not be necessary in some cases.

In this way, the recording / reproducing area (area 1)
A read-only area (areas P1 and P2), a recording / playback area (area 1), and an intermediate area, and guide grooves, pits, and land pits LPP (address information) are formed as latent images on the above-mentioned one resist disk R. ) Is recorded.

In the next development step, this latent image is deposited as a shape change and carried to the metal master forming step. In the metal master making process, a conductive film such as nickel is coated on the resist plate R described above, and nickel is plated on the conductive film.
A nickel film is formed. After that, the metal master made of nickel is peeled off from the resist plate R, and the peeled metal master is washed and processed into a size that can be mounted on a molding die. The processed metal master is called a master mold. A mother disk is attached to a molding die, and a plastic disk substrate is formed by molding.

After that, a functional film for recording (recording layer) is formed on the disc substrate, and, for example, a protective film is coated thereon, or a substrate called a dummy substrate is attached to manufacture a recording type disc. It

The first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 6 are prepared in almost the same manner, but in FIG. 1, the intermediate area is the pit area (pit row PM) and the area P1 (pit row PA). 6 and an area P2 (pit row PB), and in FIG. 6, an intermediate area is formed as a pit area (pit row PM) between the area P1 (pit row PA) and the recordable area 1. It is different.

The depth (optical depth) of the pit row PM in this intermediate region is the same as or smaller than the depth (optical depth) of the region P1 (optical depth), and is accurate. The depth may be undefined (optical depth).

Next, a disk format embodiment will be described. The type 1 shown in FIG. 5 is continuous from the track in the right reproduction-only pit P area to the left recordable groove G (groove) area on the disc described later by using the comparative example of FIG. The state is being switched to. In FIG. 8, “LPP” indicates “land prepits” formed on the land, and laser B is a laser light output for forming land prepits. 1 and / or FIG. 6, in a disc described later as a type (type) 2 in FIG. 5, the depth changes from the track of the right pit area for reproduction only to the left recordable groove G (groove) area. It 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 circumference direction) to the data area (outer circumference direction) of the disk in the embodiment of the present invention. This area is different in the disk manufacturing method as described above, and is t described in the comparative example.
type (type) 1 and type described in this embodiment
The two types (Type) 2 are configured to coexist as a format. This format has signal performance (recording / reproducing characteristics) in type 1
Is not very good, but is relatively easy to manufacture,
Type 2 is preferable in signal performance (recording / reproducing characteristics), but coexistence of two methods in which the signal performance in the intermediate region needs to be restricted allows the manufacturing method to have flexibility.

The lead-in area of type (type) 1 is (1-1) a land area on the outer peripheral side of a wobble and a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area. Initial zone in which a recording / reproducing area having a land pre-pit LPP having information such as an address is recordable / reproducible and a tracking error signal of a differential push-pull can be 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) It is a read-only area in which a DPD tracking error signal obtained from a prepit having wobbles but not having land prepits LPP and having a depth of about λ / 4 can be obtained, and 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 composed of wobbles and pre-pits having land pre-pits LPP and having a depth of about λ / 12 is obtained and the read / write signal cannot be read. A certain unreadable emboss zone w
it LPP, (1-4) recordable and reproducible area having land prepits LPP having information such as addresses in the land area on the outer peripheral side of the wobble and groove areas, and a tracking error signal of differential push-pull. Buffer zon
e2, da that records the content of the user following
It is divided in the outer peripheral direction in the order of taarea. Here, the start address of each area is shown in the upper right of each area. The operation at the time of recording of the type 1 is shown in the write mode on the left side of FIG. 5, and the operation at the time of reproduction is shown in the read mode on the left side of FIG.
recording is a recording operation, reading is a reproduction operation, seek is a seek operation, or an operation of skipping a track is skipped, and read gen wclk is 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 land area on the outer peripheral side of a wobble and a groove area having a depth of about λ / 12 from the inner circumference which is a recordable / reproducible area. Initial zone, sy, which has a land pre-pit LPP having information such as an address, is a recordable and reproducible recording / reproducible area, and can obtain a differential push-pull tracking error signal.
stem reserved zone, buffer
zone0, RW-physical format
information zone, Referen
ce code zone, (2-2) bounce in which a code for judging whether it is type 1 or type 2 is recorded
dary flag zone 1 (may be omitted), a boundary embos that is the intermediate region described above
s zone1 (from a depth of about λ / 12, about λ / 4
It is a pit area formed so as to have a depth of about a wobble, a tracking error signal of a differential push pull and a DPD tracking error signal can be obtained), and (2-3) a depth of about λ / 4. A writable read-only area in which a DPD tracking error signal composed of pre-pits having wobbles but not having land pre-pits LPP can be obtained and a recording signal can be read out, and a contr having information relating to copyright protection and lead-in information
ol data zone (Readable emb
oss without LPP), (2-4) type
Boundary flag in which a code for determining whether it is e (type) 1 or type (type) 2 is recorded
zone2 (may be omitted), which has a structure opposite to that of the intermediate region described above, a boundary emboss z
one2 (a pit area formed from a depth of about λ / 4 to a depth of about λ / 12, wobbles and LPPs are recorded (the LPP is not necessary)
Both a differential push-pull tracking error signal and a DPD tracking error signal can be obtained),
(2-5) A read-only area in which a DPD tracking error signal having a depth of about λ / 12 and composed of prepits having wobbles and land prepits LPP is obtained and the recording signal cannot be read.
embosszone with LPP, (2-
6) A writable and recordable reproducible area having 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, which is a push-pull area. The buffer zone 2 where the tracking error signal is obtained and the data area where the user's contents are recorded are sequentially divided in the outer peripheral direction. Here, the start address of each area is shown in the upper right of each area. type
The operation during recording of (Type) 2 is Write on the right side of FIG.
Mode is shown and the operation at the time of reproduction is Read on the right side of FIG.
It is shown in Mode. recording is a recording operation, reading is a reproduction operation, seek is a seek operation, or a track skip operation is performed.
d gen wclk indicates an operation of reproducing the wobble signal and the LPP address to generate the recording clock signal and the recording timing signal.

Boundary flag zone1
The boundary flag zone 2 and the boundary flag zone 2 do not have to be in this position, but the boundary zone 1 and the boundary flag zone 2 have the lead-in information for changing the recording / reproducing method according to the type (type) 1 or the 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.
The e (type) 1 or the type (type) 2 can be determined.

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

FIG. 9 shows an outer peripheral direction in the direction of each track of track number 1 to track number 9.
Corresponds to the track number 1 of type (type) 1,
A recordable and reproducible area in which each track of track number 2 has a land prepit 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 a systemrease for obtaining a differential push-pull tracking error signal.
rved zone, buffer zone0, RW
-Physical format information
ion zone, Reference code z
one, buffer zone1, linking
loss area and the like. The wobble signal is arranged in all the regions of FIGS. 5 and 9. Each track of track number 3 and track number 4 is approximately λ /
A read-only area C in which a DPD tracking error signal is obtained which is composed of prepits having a depth of about 4 and which does not have land prepits LPP and in which a recording signal can be read out.
control data zone (Readable
emboss without LPP). DPD composed of prepits each having a track number 5, a track number 6, and a track number 7 each having a depth of about λ / 12 and having a land prepit LPP
An unreadable em that is a read-only area in which a tracking error signal is obtained and a recording signal cannot be read.
It is a boss zone with LPP. Recordable / reproducible information for obtaining a tracking error signal of a differential push-pull in which each track of track number 8 and track number 9 has a land prepit LPP having information such as an address in the land area on the outer peripheral side of the groove area. Recordable / reproducible area (Data a
rea).

Next, the track of the track number 1 of type (type) 2 is a land area on the outer peripheral side of the groove area having a depth of about λ / 12 from the inner circumference which is the recordable and reproducible area in the lead-in area. Initially in which a tracking error signal of differential push-pull can be obtained, which is a recordable / reproducible area in which recording / reproduction is possible, which has a land pre-pit LPP having information such as an address.
zone, system reserved zone
e, buffer zone0, RW-physica
l format information zone
e, Reference code zone and the like. The track with track number 2 is the 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 is composed of pre-pits without land pre-pits LPP to obtain a DPD tracking error signal and from which a recording signal can be read Control data zone (Readab
Le embossed without LPP). The track with track number 5 is the intermediate area. Track number 6 and track number 7 are
Land pre-pit LPP consisting of a depth of about λ / 12
Of the read-only area where a DPD tracking error signal composed of pre-pits and a recording signal cannot be read
It is with LPP. A recordable / reproducible area in which each track of track number 8 and track number 9 has a differential push-pull tracking error signal having a land prepit LPP having information such as an address in a land area on the outer peripheral side of the groove area. (Data area).

In this arrangement, when recording or reproducing is performed, type (type) 1 or type (type)
It is necessary to judge 2. The type 1 or type 2 detection method is as follows: When the disc is inserted and the start-up process is performed, the control data zone having the lead-in information is reproduced, and the type (type) is set in this area. 1 or type
If (Type) 2 is recorded, this value is used for the determination. This can be read by a recording device or a reproducing device in a similar manner. In another example of this embodiment, b
boundary flag zone 1 and bound
type as LPP to the ary flag zone2
Since (Type) 1 or Type (Type) 2 is recorded, it is possible to judge by reading this value at the time of recording. This method can be applied when recording is performed by the recording device. This type of recording may be performed by any other method as long as it can be detected in the state of an unrecorded disc.

When the type 1 is recorded 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 wobbled frequency signals on both sides of the track in all areas as described above. By detecting this frequency signal, the speed signal for rotating the disk is fed back to The recording clock signal is generated while the constant linear velocity is controlled. Next, the 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) is started. Then, the recording is stopped at the linking timing at which the address corresponding to the track of track number 3 is reached, and the reproduction state (W shown on the left side of FIG.
read) in write mode.

Although the track of track number 3 is composed of reproducible pits in the recording area and has no LPP signal, an address is detected from the reproducible pits and a reproducing operation is performed based on the address (on the left side of FIG. 5). Shows the Write Mod
In e, reading, Control data
zone (Readable embroid wit
hout LPP)) Perform up to track number 4. Next, the track number 5, the track number 6, and the track number 7 are tracks in which the pit signal cannot be reproduced.
Since there is a P signal, the wobble signal and the LPP address are reproduced during reproduction of this track to generate the recording clock and the recording timing (Write Mod shown on the left side of FIG. 5).
e in reading gen wclk, Unr
enableable emboss with LPP),
Similarly, recording is started at the linking timing on the tracks of track numbers 8 and thereafter, and the subsequent recording processing is performed (recording, buffer zone 2 to 2 in Write Mode shown on the left side of FIG. 5).
Data area). Where type (type) 1
Then, both sides of the track are symmetrical with respect to each other, and each track of track number 2 and track number 3, each track of track number 4 and track number 5, and track number 7 and track number 8 respectively. The tracking error signal due to the differential push-pull of the track boundary can be continuously obtained with a certain amplitude difference.

Since the boundary of the pit area can be continuously recorded in this manner, the RF signal can be continuously obtained at the time of reproduction and the processing at the time of reproduction (R shown on the left side of FIG. 5).
Ead Mode) uses tracking errors as a phase difference method (DPD) (which may be differential push-pull) and sequentially reproduces tracks from track number 1 to track number 9 (Rea shown on the left side of FIG. 5).
d Mode, reading, Initial
zone ~ Control data zone (R
eable embossed without LP
P)). At that time, since signals cannot be reproduced on the respective tracks of track number 5, track number 6, and track number 7, they are skipped (Read in the left side of FIG.
Seek, Unreadable in Mode
emboss with LPP-buffer zo
ne2), and thereafter, the tracks of track numbers 8 and later are continuously reproduced (Rea shown on the left side of FIG. 5).
Reading and Data ar in d Mode
ea).

Next, when the type 2 is recorded in order from the track with the track number 1, the respective tracks of the track number 1, the track number 8 and the track number 9 are tracks to be recorded. The track of the track number 2 which is the intermediate area is a recordable track in the type (type) 1, whereas the track of the type (type) 2 is
The reason why it is a pit track is that the track number 2 has different land depths 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, it is possible that the signal cannot be obtained and the recording clock or the timing signal cannot be obtained accurately at the signal amplitude and the signal offset level as in the previous track. .

Similarly, in the track of track number 5 which is the intermediate area, the depths of lands on both sides of the track are different,
Even if the wobble signal and the LPP signal necessary for recording are recorded, there is a possibility that an accurate signal may not be obtained with the signal amplitude and the signal offset level as in the previous track. Since the signal may not be accurately obtained in some cases, the recording clock and the timing signal may be accurately obtained in tracks with track numbers 6 and later.

Recording processing in sequence (Writ shown on the right side of FIG. 5)
e Mode) will be described. In the track of track number 1, there is a wobbled frequency signal on both sides of the track as described above. The frequency signal that detects the frequency signal is fed back to the disk to control the disk at a constant linear velocity. And a recording clock signal is generated. Next, the 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 (rewriting in the Write Mode shown on the right side of FIG. 5).
cording 、 Initial zone ~ boun
Start the dary flag zone 1).

Then, at the linking timing when the address corresponding to the track of track number 2 is reached, recording is stopped and the reproduction state is set. The track of track number 2 is skipped because the recording area cannot be reproduced or is composed of reproducible pits (Write M shown on the right side of FIG. 5).
The wavy line of recording in ode, bou
ndary flag zone 2). The track of track number 3 is composed of reproducible pits in the recording area, and there is no LPP signal, but the address is detected from the reproducible pits and the reproduction track number 4
Up to the track (Write M shown on the right side of FIG. 5)
reading, control da in ode
ta zone (Readable emboss w
itthout LPP) ~ boundary flag
zone 2).

Next, since the pit signal may not be reproduced on the track with track number 5, and the LPP signal may not be reproduced correctly, it is skipped. Next, the track number 5, the track number 6, and the track number 7 are signals in which the pit signal cannot be reproduced. However, since the wobble signal and the LPP signal are present in this area, the wobble signal is reproduced during this track. The signal and the LPP address are reproduced, and the recording clock and the recording timing are generated (reading gen wclk, Unrea in Write Mode shown on the right side of FIG. 5).
In the same manner, recording is started at the linking timing on the tracks of the track number 8 and later, and the subsequent recording process is performed (re in the 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, which are intermediate regions on both sides of the track, are also asymmetrical, and the tracking error signal of the push-pull system has an amplitude difference and an offset in the tracks at this boundary. Although the recording error cannot be accurately recorded or reproduced, the tracking error signal by the differential push-pull method can be continuously obtained within a certain allowable difference in amplitude.

By arranging the areas in this way, it is possible to continuously record the boundaries of the pit areas.
F signal can be continuously obtained, and processing at the time of reproduction (Fig.
(Read Mode) shown on the right side of FIG. 1 sequentially reproduces the tracking error from the track of track number 1 to the track of track number 9 using the phase difference method (DPD) (which may be differential push-pull). At this time, in type (type) 2, since signals cannot be reproduced on the respective tracks of track number 2, track number 5, track number 6, and track number 7, they are skipped (seek in Read Mode shown on the right side of FIG. 5,
Initial zone-boundary emb
oss zone 1, boundary flag
zone 2 to buffer zone 2), and then
Tracks number 3, track number 4, and track numbers 8 and subsequent track numbers are continuously reproduced (reading, Control data zone in Read Mode shown on the right side of FIG. 5).
e (Readable embroidery without
LPP) -boundary flag zone
2, Data area).

Further, temporarily, type (type) 1 and ty
The type of pe (type) 2 cannot be detected.
If it is set as (Type) 1, or if it is accidentally typed
The present invention is also effective when e (type) 2 is detected as type (type) 1. That is, in this case, in the case of recording, the recording device tries to perform the recording process on the track of track number 2, but with the track number of track number 2,
Although the wobble signal can be detected, the LPP cannot be detected accurately, so the recording is stopped midway. Alternatively, the recording processing is performed while the LPP signal is complemented by the signal processing circuit. Even if all the tracks of track number 2 are recorded, when this track is played back,
Since the tracking error signal can be obtained from this area, the 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 LPP signal cannot be read from the track with track number 5, but since it is read from the next track, recording / reproduction can be performed without problems.

FIG. 10 is a diagram for explaining the lead-in area and the data area of the information recording medium which is the third embodiment of the present invention. The buffer zone 1 of type 2 shown in FIG. 5 is unr in FIG.
accessible emboss with LPP b
The difference is that it is founder flag 1. Also in this case, the wobble signal is recorded in all areas, and the wobble signal can be obtained in all areas. This disk is called type (type) 3. type
Regarding the recording and reproducing operations of the (type) 3, Write Mode and Read are shown on the right side of FIG. 10, respectively.
It is shown in Mode. For this behavior, unre
addle emboss with LPP bou
It is the same as the type (type) 2 except for the end flag 1 and therefore the description of the overlapping operation is omitted.
The description of the operation different from that of type (type) 2 is as follows. unreadable emboss with
The area of the LPP boundary flag 1 is u
nreadable emboss with LPP
Same as area, in the LPP in this area,
The difference is that dary flag 1 is written. In FIG. 10, the area to be recorded in the buffer zone 1 is the unreadable emboss area, so the reference code z before that area is set.
Recording is terminated with one, and the operation is switched to the reproduction operation. Since the type (type) 1 is the same as the type (type) 1 shown in FIG. 5, the description thereof will be omitted.

FIG. 11 is a diagram for explaining the lead-in area and the data area of the information recording medium according to the fourth embodiment of the present invention. Also in this case, the wobble signal is recorded in all areas, and the wobble signal can be obtained in all areas. The type 4 and the type 5 shown in FIG. 11 are the boundary emboss zone 1 of the type 2 shown in FIG.
And the boundary embossing zone 2 in FIG.
Type (type) 1 and type (type) 2 shown in
It is arranged at the same address position in and. b
foundry emboss zone 1 and bou
As described above, the ndary emboss zone 2 is an area composed of embossed pits as shown in the comparison table on the right side of FIG.
In (Type) 4, wobbles and LPPs are recorded, but in Type (Type) 5, wobbles are recorded, but LPPs may not be recorded. Or LPP
Is an area that cannot be read accurately even if it is recorded. The embossed pits in this area may or may not be able to reproduce data. type 4
Alternatively, identification information indicating that the type (type) is 5 is LPP, or readable control data.
It is recorded in advance in a reproduction-only area such as a zone.

With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) shown in FIG. 11 are linked as shown in the left side of FIG.
Record up to ng loss area (recordin
g), switch to playback mode (reading), un
A wobble signal is reproduced from the readable emboss 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).
Then, re-record from the buffer zone (record
ding) is restarted. Since the reproducing operation is the same as that of the above-mentioned embodiment, its explanation is omitted.

As described above, even with type (type) 4, t
The same recording / playback method for ype (type) 5
Since it can be applied, there is an advantage that the device can be easily designed. However, as mentioned above, type 4
In the case of, the tracking signal may be push-pull or differential push-pull with almost no problem.
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
Since it is difficult to pass through and the boundary emboss zone 2 in succession, type (type)
4 or type (type) 5 identification information is LPP or readable control data zone
By pre-recording in a reproduction-only area such as e, it is possible to adapt to each disc.

The t of the disk described in each of the above embodiments
When the type (type) is classified, the type (type) 1
And type (type) 4 are in the same group,
In the following description, this will be described with the type 1 as its representative. In addition, type (type) 2, type
Since the e (type) 3 and the type (type) 5 are in the same group, the following description will be made with the type (type) 2 as a representative. With such a configuration, type (type) 1 and type (type)
Since two different manufacturing methods of (Type) 2 are acceptable and the tracking error signal can be continuously obtained at the time of recording and reproducing, the recording and reproducing can be continuously performed without interruption. DVDs on sale
-It increases the added value of the DVD-RW without affecting the ROM or the DVD video reproducing device.

In the above-described embodiment, a bo track consisting of a pit area of one track which is an intermediate area between the reproduction-only area and the recording area or between the reproduction-only area and the reproduction-only area.
unbounded emboss zone 1 and bound
Although the early emboss zone 2 is provided, it goes without saying that the area may be two or more tracks. As can be seen in FIG. 5, type 1 and type
The difference between e (type) 2 is very small, and is the boundary area between the recording area and the reproduction-only area.
Boundary embos, which is a boundary area between the ss zone 1, the first reproduction-only area, and the second reproduction-only area.
An area that does not need to be recorded when the address cannot be accurately detected, using s zone2 as a boundary area, or
If it is defined that the reproduction signal does not need to be accurately read out, the type 1 and the type 2 can have a common format. The names used here are only 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 the lead-in area and the data area of the information recording medium which is the fifth embodiment of the present invention. Also in this case, the wobble signal is recorded in all areas, and the wobble signal can be obtained in all areas. The type (type) 6 and the type (type) 7 shown in FIG. 12 are the boundary emboss zones of the type (type) 4 shown in FIG.
In 1 (type) 6, wobble and LPP are recorded writable groove areas in which the wobble is recorded, and in type (type) 7, wobbles are recorded in this area, but LPP is recorded. Not embossed pit area, b
founder emboss zone 2 is shown in FIG.
Boundary emboss zone 1 shown in
The wobbles and LPPs similar to those in # 1 and # 2 are recorded embossed pit areas, and in the case of type 7, they are areas in which the LPPs cannot be read accurately even if the LPPs are recorded. Identification information indicating the type (type) 6 or the type (type) 7 is recorded in advance in the read-only area such as the LPP or the readable control data zone.

By defining the area in this way, type
The (type) 6 and the type (type) 7 may have a common format. At this time, this area may be recorded or played back. Therefore, if the wobble signal is recorded in advance in this area even if there is no LPP address signal, the spindle speed signal can be generated, and the LPP address signal can be generated. It is possible to record by complementing the circuit. Actually, in the case of the recording of the boundary zone 1, in the case of the type 6, as shown in the table, the ECC blocks in the latter half of the two ECC blocks are Linki.
Record up to here as ng Loss Area,
In the case of type 7, the first half ECC block is Linki
Recording is performed up to this point as ng Loss Area.

Boundary emboss z
For the same reason, if the wobble signal is recorded in advance in the one 2, it is possible to continuously generate the recording clock for recording and to generate the speed signal of the spindle. The type (type) 6 and the type (type) 7 Thus, it is possible to perform recording / reproduction processing while maintaining compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal, and a DC offset also occurs in the wobble signal. However, if the offset signal is passed through a bandpass filter or the like, the wobble signal becomes since missing without continuously obtained, or may be a lack of short wobble signal, by circuitry to complement the continuity of the wobble signal, it is possible to eliminate this effect. With such a configuration, compatibility is maintained during recording and reproduction, a method for manufacturing two discs is possible, and it contributes to the development and spread of such a format.

It should be noted that, as is common to all the embodiments, the boundary emboss zone 1 or the boundary zone 1 is formed by forming a pit in the middle region of one round of a disc-shaped disc, but is arranged as an intermediate region 2ECC. The block is a slightly larger area than the one lap. Therefore, the second half ECC
Several sectors or several sync frames of the block are readable areas like the control data zone which is the next area. And this area is at least 2
Since the sync frame is secured, when the control data zone is to be reproduced, the control data zone can be accurately read from the beginning by pulling in the PLL of the reproduction signal and detecting the sync during this period. boundary emboss zone 2
Similarly, the 2ECC block arranged as the intermediate region is a region slightly larger than one round.
Therefore, several sectors or several sync frames of the latter half ECC block are areas in which the wobble signal and the LPP signal can be read out similarly to the unreadable emboss zone which is the next area.

With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) in FIG. 12 are the same as those in the above-described embodiment, as shown on the left side of FIG. However, the type 6 or 7 information recorded in the LPP or the control data area is acquired, and in the case of the type 6, the recording operation (Write mode) is bounda.
Link the last ECC block of ry zone 1
ng loss area and record up to here (rec
, and 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 recording timing is generated (reading gen w
clk) and then restart recording from the buffer zone. In the case of type 7, the recording operation (Write mode) is bounda
li the last ECC block before ry zone 1
Recording loss up to this point, and playback mode (readin)
g) switch to unreadable emboss
A wobble signal is reproduced from the within LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading g).
en wclk), and then restart recording from the buffer zone. Further, even if the type 7 medium is recorded by the type 6 method assuming that the type 6 or 7 information recorded in the LPP or control data area is not acquired, the wobble signal is continuous. It is also possible to continuously perform recording based on this signal even if the LPP signal cannot be obtained. In this case, when the area is reproduced, the recorded signal cannot be read out, but since it is the information of one track and not the information of the important information area, no trouble occurs. The rest of the reproducing operation is the same as that of the above-mentioned embodiment, and therefore its explanation is omitted.

FIG. 13 is a view for explaining the concept of the cutting state of the information recording medium which is the sixth embodiment of the present invention. In FIG. 13, in the above description of the present invention, the bottom surface is configured with the same depth (position), while in the sixth embodiment, the bottom surface of FIG. 13 is a different guide groove. In the intermediate area, the pit row area and the bottom surface of the guide groove area gradually become shallower with a predetermined inclination from the guide groove direction toward the pit row direction, and the bottom surface of the pit row is the same as the bottom of the guide groove again. It is configured to face. The modified part of the method for manufacturing as described above with respect to the conventional method is roughly performed as follows.

At the switching portion of the guide groove and the pit row whose bottom surface is on the surface of the glass master, the condition for cutting the guide groove and the land pre-pit exposed up 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 oscillated right and left by the optical polarizer so that the wobble signal had an amplitude of 15 nm on the resist board. The laser light intensity was set so 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, laser (light) B was set to have a laser light intensity (PB3) for forming a desired land prepit, and the depth of the land prepit to be cut was set to about 30 nm. The cutting was performed at a constant linear velocity. The turntable is equivalent to the track pitch during one rotation of the registration board,
It was controlled to move at a constant velocity from the inner circumference to the outer circumference of the resist plate at 0.74 μm. Subsequently, each laser output was continuously changed while cutting the inclined portions of the three tracks. At this time, laser (beam) A
Controlled so that the laser intensity was suitable for recording a guide groove having a bottom surface that did not reach the glass master surface. At this time, the bottom surface of the guide groove is not exposed to the surface of the glass master. The wobble signal has an amplitude of 15 nm on the resist board, and the laser light is swung left and right by the optical polarizer. The laser light intensity is set so that the width of the guide groove to be cut is 0.3 μm and the groove depth is about 30 nm. The laser (beam) B is controlled so as to continuously reach the laser intensity necessary 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 glass master disk surface is suitable for recording the guide groove having the bottom surface where the laser (beam) A does not reach the glass master disk surface as an initial condition. Here, the laser intensity is controlled so as to continuously reach the laser intensity suitable for recording the exposed guide groove up to the surface of the glass master while cutting the three-track inclination. Similarly, the laser (beam) B light has a laser intensity set so that the depth of the land pre-pits to be cut is about 30 nm from the laser light intensity at which desired land pre-pits are formed to the land pre-pits to be cut during cutting of three track inclinations. Continuously change to.

The track in the recordable intermediate area having the inclination of the disc manufactured by the above method is somewhat in the push-pull system or the differential push-pull system as the tracking system as described in the above embodiment. Although offset may occur, recording / reproduction is possible on this track. Therefore, since recording cannot be performed in the push-pull method as in the above-described embodiment, it is possible to provide a recordable area that does not need to be composed of prepits. Also, after recording in this area,
With the differential phase detect (DPD) method, stable tracking can be performed with almost no occurrence of offset or the like. In the above-described embodiment, there is a case where the intermediate area including the pit area is overwritten or an offset or the like occurs in the differential phase detect (DPD) method depending on the pit shape of the intermediate area. In the example, this problem can be solved. The wobble signal is also LP in this intermediate area.
Since the P address signal can also be prepared in advance, the recording operation of the signal to be written can be performed almost accurately, and similarly, the reproduction operation of the reproduction signal can be stably performed.

FIG. 14 is a diagram for explaining the lead-in area and the data area of the information recording medium according to the sixth embodiment of the present invention. Also in this case, the wobble signal is recorded in all areas, and the wobble signal can be obtained in all areas. The type 6 shown in FIG. 14 is shown in FIG.
2 is substantially the same as the type (type) 6 shown in FIG. 2, and the type (type) 8 shown in FIG. 14 is a boundary zo of the type (type) 7 shown in FIG.
In ne1, this area is an embossed pit area in which wobbles can be said to be recorded but LPPs are not recorded, whereas in type (type) 8, wobbles and LPPs are slanted as described above. A recordable groove area is recorded, and the LPP in this area is an area in which the LPP does not have to be accurately read even if it is arranged. Boundary emboss zone 2
The boundary emboss zo shown in FIG.
The wobbles and LPPs similar to ne2 are the embossed pit areas recorded, and in the case of type 8, even if the LPPs are recorded, the LPPs cannot be read accurately. The identification information indicating the type (type) 6 or the type (type) 8 is recorded in advance in the read-only area such as the LPP or the readable control data zone. For example, the identification information can be defined as 0: no boundary present and 1: boundary present in Media type 3 (media type) of the Disc Physical code of the LPP information.

If the area is defined in this way, type
The (type) 6 and the type (type) 8 can have a common format. At this time, in the case of recording and reproducing this area, the LPP is temporarily assumed in this intermediate area.
Even if the address signal of is not detected, from the wobble signal,
It is possible to generate a speed signal of the spindle and to supplement the address signal of the LPP in a circuit manner for recording. Actually, in the case of the boundary zone 1 recording,
2F1F0h EC for both Type 6 and Type 8
Recording is performed up to this point with the C block as the Linking Loss Area.

Boundary emboss z
For the same reason, if the wobble signal is recorded in advance in the one 2, it is possible to continuously generate the recording clock for recording and to generate the spindle speed signal. The type 6 and the type 8 Thus, it is possible to perform recording / reproduction processing while maintaining compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal, and a DC offset also occurs in the wobble signal. However, if the offset signal is passed through a bandpass filter or the like, the wobble signal becomes This effect can be eliminated by complementing the continuity of the wobble signal with a circuit, since the wobble signal can be obtained continuously without any loss or can be made to be a short period of time. With such a configuration, compatibility is maintained during recording and reproduction, a method for manufacturing two discs is possible, and it contributes to the development and spread of such a format.

With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) of FIG. 14 are the same as those of the above-described embodiment, as shown on the left side of FIG. However, the type 6 or 8 information recorded in the LPP or the control data area is acquired, and in the case of the types 6 and 8, the recording operation (Write mode) is a bounce.
The lin of the last ECC block of the dry zone 1
King loss area and recorded up to here (r
recording), playback mode (reading)
Switch to unreadable emboss wi
The wobble signal is reproduced from the th LPP area, the clock for recording is generated, the address signal is generated from the LPP, and the recording timing is generated (reading gen).
wclk), and then restart recording from the bufferzone. Further, when recording to the boundary zone 1 with type 8, when the push-pull method is used as a tracking error, an offset signal within an allowable range is generated in the tracking error signal, and therefore, only when recording this area in advance. By measuring the offset value and controlling the offset to be canceled according to this value, more accurate recording can be performed. Also, if it is L
Even if the type 7 medium is recorded by the type 6 method assuming that the type 6 is recorded 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, it is possible to continuously record even if the LPP signal cannot be obtained.

The boundary zone described here
The expressions e1 and e are expressed as described above because they are areas sandwiched between areas having substantially different depths, but different expressions may be expressed as normal data areas. In particular, the difference between type 6 and type 8 is small, and it is expressed as a normal data area. As a characteristic of the data therein, for example, the jitter of the reproduced signal of type 6 is 8% or less. The reproduced signal has a jitter of 10% or less, and the type 6 LPP reproduced signal has an error rate of 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. You may define the difference in data such as a difference as the type. Further, as a different expression method, the standard value defined for a normal data area is not accurately defined for both type 6 and type 8 and this area is expressed in common. There is a way. Further, in this embodiment, the region of the boundary zone 1 is configured so that the depth is gradually changed.
The e2 is different only in that it is formed by pits, but similarly, the depth may be gradually changed.

In the seventh embodiment of the present invention, a case will be described in which what corresponds to the contents of the embodiment of FIG. 14 is defined as the type 1 form of FIG. The description of FIGS. 14 and 5 is omitted because it has already been described, but the differences are as follows. That is,
The ty shown in FIG. 14 when the difference is considered in a large field of view.
pe (type) 6 is the type (type) shown in FIG.
6 is substantially the same as the type (type) 1 shown in FIG. 5 except that the name of the region is changed, and the type (type) 8 shown in FIG. 14 is a boundary zo.
ne1 is slanted as above, wobbles and LP
If P is a recordable groove area,
On the contrary, since it is the same area as the type 1 buffer zone 1, it can be defined as the buffer zone 1. Similarly, the boundary em shown in FIG.
In the boss zone 2 as well, since wobbles and LPPs are recorded embossed pit areas, unread
Since it is the same as the available emboss with LPP region, it is an unreadable emboss.
It can be defined as a with LPP region.

By this definition, type 6 and type 8 in FIG. 14 can be made the same as type 1 in FIG. The type 6 and type 8 described in FIG.
Flag does not exist. However, two boundary areas where two boundary zones were present as the positional relationship in FIG. 14 (this boundary track is one track near the boundary of a read-only track composed of a track in a recordable area or a pit). In some cases, the push-pull tracking error signal among the tracking error signals may differ from the amplitude level and offset level of the normal signal area as described above.

The amplitude of the push-pull tracking error signal is originally different in the recordable area and the read-only area, and is defined in each area. In this boundary area, as shown in FIG. The amplitude of the push-pull tracking error signal in the recordable area when crossing the track when tracking off is set to the peak value P1 in the upward direction and the peak value P2 in the downward direction with reference to the center voltage, and the center voltage in the area near the boundary is set. When the upper peak value P3 and the lower peak value P4 are based on
3 / (P1 + P2)> 0.2 and P4 / (P1 + P2)
> 0.2. Even if the amplitude of the push-pull tracking error signal becomes small, this value of 0.2 is
This is a value necessary for controlling tracking and the like to be stable when recording or reproducing this area. In addition,
The value of 0.2 is preferably in the range of 0.15 to 0.3 because there is a factor that varies depending on the measuring method. For example, in the recordable area other than this boundary area, the offset amount of the amplitude of the push-pull signal is defined as a standard of asymmetry using the equation (P1-P2) / (P1 + P2). When an attempt is made to define the boundary region using this equation, as shown in FIG. 15, the amplitudes of P3 and P4 are symmetric, and when the amplitude is extremely small,
Although the expression (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 tracking servo has a small amplitude in a stable range, the value of (P1-P2) / (P1 + P2) makes the disk unsatisfactory, which is a factor that deteriorates the manufacturing margin of the disk. Therefore, the introduction of this new equation to define this area is the most preferable for the disc of the present scheme.

With such a format, the recording operation (Write Mode) and the reproducing 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) starts with bo.
l of the last ECC block of unary zone 1
Inking loss area is set and recording is performed up to this point. However, as described above, the area near the 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 that of other tracks. The recording control can be stably performed by changing the gain and offset control values during the tracking control only when recording the 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 playback mode (reading) is switched to, the control data area is played back, and the unreadable emboss
A wobble signal is reproduced from the within LPP area, a clock for recording is generated, an address signal is generated from the LPP, and recording timing is generated (reading).
(gen wclk), and then restart recording from the buffer zone. From this control data area, unreadable em
The boundary between the both with LPP areas is also a boundary area. At this time as well, when the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from that of other tracks. It is possible to perform stable recording control by changing the gain or 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 reproducing operation (Read Mode) of FIG.
When it is determined that the disc is this type, if the control data area is reproduced first, the bound
link of the last ECC block of the ary zone1
The usual method is to move to the vicinity of the ing loss area and reproduce the first area of the control data area. In that case, as described above, this linking is performed.
The area near the loss area is the boundary area,
When the amplitude of the tracking error signal is small, the offset level of the tracking error signal may be different from that of other tracks, so changing the gain or offset control value during tracking control only when reproducing this area. It is possible to pass 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. It should be noted that this area is recorded as information that does not have any meaning, such as 0 data, so that even if the reproduced data has an error, it may be skipped. After the control data area is reproduced and necessary lead-in information and information regarding copy protection are obtained, the control area is moved to the data area and content reproduction processing is performed.

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

[0105]

According to the present invention, near the boundary between the information recordable area and the first read-only area and near the boundary between the first read-only area and the second read-only area. It is said that there will be no problems such as deterioration of trackability at the time of recording due to improvement of recording / reproducing signal characteristics, generation of an excessive offset signal in a tracking error signal, or loss of a tracking error signal. Have advantages. Further, there is an advantage that reproduction can be performed without problems even if the discs are different types.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of an information recording medium of a first embodiment of the present invention.

FIG. 2 is an EC for data to be recorded on the information recording medium of the present invention.
It is a figure for explaining making into C block.

FIG. 3 is a diagram for explaining that ECC block data is recorded in a predetermined area of an information recording medium of the present invention in sector units.

FIG. 4 is a DVD which is 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 diagram for explaining a lead-in area and a data area of the information recording medium of the present invention.

FIG. 6 is a diagram for explaining an embodiment of the information recording medium of the second embodiment of the present invention.

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

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

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

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

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

FIG. 12 is a diagram for explaining a lead-in area and a data area of the information recording medium of the fifth embodiment of the present invention.

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

FIG. 14 is a diagram for explaining a lead-in area and a data area of the information recording medium of the sixth embodiment of the present invention.

FIG. 15 is a diagram for explaining the amplitude of the tracking error signal according to the seventh embodiment of the present invention.

[Explanation of symbols]

PA, PB, PM pit row P1, P2 play-only area Area 1 Recording / playback area

   ─────────────────────────────────────────────────── ─── Continued front page    (31) Priority claim number Japanese Patent Application 2000-211615 (P2000-211615) (32) Priority date July 12, 2000 (July 12, 2000) (33) Priority claiming country Japan (JP)    Application for accelerated examination

Claims (2)

(57) [Claims] 1. An information recordable area formed from a spiral or concentric information track, in which a frequency signal and an address signal are previously recorded from the inner circumference of the information track, and a signal to be reproduced is recorded as a pit. An information recording medium having a first reproduction-only area in which a frequency signal is recorded in advance and a second reproduction-only area in which a signal to be reproduced is recorded as a pit and in which a frequency signal and an address signal are recorded in advance. In the tracking-off of the boundary area between the information recordable area and the first reproduction-only area and the boundary area between the first reproduction-only area and the second reproduction-only area , The tracking error signal is the tracking error signal of the information recordable area .
Maximum amplitude of tracking error signal at racking off
Where A is the tracking error of the boundary area.
-Each of the maximum amplitude in both directions from the center of the maximum amplitude of the signal
B1 and B2 are B1> 0.2 * A and B2> 0.2 *
An information recording medium characterized in that it is defined to be in the range of A. 2. The information recording medium according to claim 1 is reproduced.
In the information recording medium reproducing method, the information recording is performed according to the address signal of the information track.
Available area, the first reproduction-only area and the second reproduction-only area.
Based on the amplitude of the tracking error signal in the
There is a step of continuously tracking the boundary area.
An information recording medium reproducing method characterized by the following.