JP4878649B2 - Information recording medium, information recording medium reproducing method, information recording medium reproducing apparatus, information recording medium recording method, and information recording medium recording apparatus - Google Patents

Description

The present invention has both a recording / reproduction area (guide grooves and grooves) and a reproduction-only area (area where pit rows are formed), and the address information of the recording / reproduction area includes land pre-pits (land between guide grooves). the following are formed as described as "LPP") for example, the recording and reproducing information recording medium such as a DVD-RW, a method of reproducing the information recording medium, and reproducing apparatus of the information recording medium, method of recording the information recording medium, and The present invention relates to a recording apparatus for an information recording medium .

In general, in a high-density recording type optical disc such as a DVD-RW that can be recorded a plurality of times with compatibility with DVD video (hereinafter sometimes simply referred to as a recording type optical disc), the content is protected by copyright. It is necessary to prevent unauthorized copying (recording and reproduction) of content unintentionally. A DVD video is a reproduction-only disc, and copyright information prohibiting copying of content is recorded in a predetermined area (information area relating to copyright protection such as a CSS key) of the disk by CSS (content scramble system). Yes. Then, the DVD video playback apparatus reads information related to copyright protection such as the CSS key and reproduces the content using the information related to copyright protection such as the CSS key. ing.

When a high-density disc in which the DVD video content is recorded together with information related to copyright protection by the above-described high-density disc recording device is reproduced by the DVD video playback device, the copyright protection information can be read out. Therefore, the content of the copy-prohibited DVD video can be reproduced, and as a result, the copyright of the copy-prohibited DVD video cannot be sufficiently protected.

In the present invention, in order to solve the above-mentioned problem, the first invention has a plurality of spiral information tracks, and the information is formed as first emboss on the track in the land area. In order to manage user information to be reproduced from the information track following the first intermediate area, an intermediate area, a first read-only area in which control data is formed as a first emboss, and the land A second reproduction-only area in which information is formed as a second emboss different from the first emboss on a track in the area; an information track area in which user information is recorded; and the first reproduction-only area A second intermediate area between the first reproduction-only area and the second reproduction-only area between the first reproduction-only area and the second reproduction-only area. First re The tracking error signal at the time of tracking off of the second intermediate area between the dedicated area and the second read-only area is the maximum of the tracking error signal at the time of tracking off of the information track area in which the user information is recorded. An information recording medium characterized by being defined as a ratio of the maximum amplitude in both directions from the center of amplitude is provided.
According to another aspect of the present invention, there is provided an information recording medium reproducing method for reproducing the information recording medium according to the first invention, wherein the information is based on reproduction of the control data. Provided is a method for reproducing an information recording medium, wherein user information recorded on a track is reproduced.
According to another aspect of the present invention, there is provided an information recording medium reproducing apparatus for reproducing the information recording medium according to the first aspect, wherein the information is based on the reproduction of the control data. Provided is an information recording medium reproducing device for reproducing user information recorded on a track.
In order to solve the above problems, the present invention provides a recording method of an information recording medium for recording information on the information recording medium of the first invention, based on reproduction of the control data. There is provided a recording method for an information recording medium, wherein user information is recorded on the information track.
In order to solve the above-mentioned problems, the present invention provides a recording apparatus for an information recording medium for recording information on the information recording medium of the first invention, wherein the control data is reproduced. According to the present invention, there is provided a recording apparatus for an information recording medium, wherein user information is recorded on the information track.
In order to solve the above-described problems, the sixth invention has a plurality of spiral information tracks, and information is formed as first emboss on the tracks in the land area. A first reproduction-only area in which control data is formed as a first emboss to manage user information to be reproduced from the information track, following the first intermediate area; A second reproduction-only area in which information is formed as a second emboss different from the first emboss on a track in the land area; an information track area in which user information is recorded; and the first reproduction A second intermediate area between the dedicated area and the second read-only area for continuously connecting tracks of the first read-only area and the second read-only area; The first The push-pull tracking error signal at the time of tracking off of the second intermediate area between the reproduction-only area and the second reproduction-only area is the push-pull at the time of tracking-off of the information track area in which the user information is recorded. Provided is an information recording medium characterized in that a predetermined value can be secured in both directions from the center level of the push-pull tracking error signal with respect to the maximum amplitude of the tracking error signal.
In order to solve the above-described problems, the present invention provides a method for reproducing an information recording medium according to a sixth aspect of the present invention, wherein the information is recorded on the basis of reproduction of the control data. Provided is a method for reproducing an information recording medium, wherein user information recorded on a track is reproduced.
According to another aspect of the present invention, there is provided an information recording medium reproducing apparatus for reproducing the information recording medium according to the sixth aspect, wherein the information is based on reproduction of the control data. Provided is an information recording medium reproducing device for reproducing user information recorded on a track.
In order to solve the above problems, the present invention provides a recording method of an information recording medium for recording information on the information recording medium of the sixth invention, wherein the ninth invention is based on reproduction of the control data. There is provided a recording method for an information recording medium, wherein user information is recorded on the information track.
Further, in order to solve the above-mentioned problems, the present invention provides a recording apparatus of an information recording medium for recording information on the information recording medium of the sixth invention, based on reproduction of the control data, There is provided a recording apparatus for an information recording medium, wherein user information is recorded on the information track.

According to the present invention, by providing an intermediate region between the playback-only area and the reproduction only area, to improve the recording and reproduction signal characteristics, and or generating excessive offset signal to the tracking error signal, a tracking There is an advantage that a problem such as a drop in trackability during recording does not occur due to an error signal being lost. In addition, even if the discs are of different types, there is an advantage that recording or reproduction can be performed without any problem.

It is a figure for demonstrating one Example of the information recording medium of 1st Example of this invention. It is a figure for demonstrating making the data recorded on the information recording medium of this invention into ECC block. It is a figure for demonstrating recording the data made into ECC block on the predetermined area | region of the information recording medium of this invention per sector. It is a figure which shows the physical format of 1 sector in DVD-RW which is one Example of the information recording medium of this invention. It is a figure for demonstrating the lead-in area | region and data area of the information recording medium of this invention. It is a figure for demonstrating one Example of the information recording medium of 2nd Example of this invention. It is a figure for demonstrating an example of the cutting state in an information recording medium. It is a figure for demonstrating the other example of the cutting state in an information recording medium. It is a figure for demonstrating the positional relationship of the operation | movement of recording and reproduction | regeneration in this invention. It is a figure for demonstrating the lead-in area | region and data area | region of the 3rd information recording medium of this invention. It is a figure for demonstrating the lead-in area | region and data area of the information recording medium of the 4th Example of this invention. It is a figure for demonstrating the lead-in area | region and data area | region of the information recording medium of the 5th Example of this invention. It is a figure for demonstrating the other example of the cutting state in the information recording medium of the 6th Example of this invention. It is a figure for demonstrating the lead-in area | region and data area of the information recording medium of the 6th Example of this invention. It is a figure for demonstrating the amplitude of the tracking error signal of the 7th Example of this invention.

In a recordable disc such as a DVD-RW, an embossed pre-pit is used to write in a predetermined area (information area related to copyright protection) of a disc in which information related to copyright protection of DVD video is recorded in a normal state. Information related to copyright protection information is recorded and processed so that copyright protection information cannot be overwritten later. As a result, when a high-density disc recording device records content that does not support copyright protection information on a DVD-RW and plays it back on a DVD-video playback device, it corresponds to the content. Since the copyright protection information cannot be read, the DVD video content cannot be reproduced. As a result, copyright protection of copy-prohibited DVD video can be achieved.

For recordable optical discs, the conditions for specifying the amount of laser light for recording, the type of disc, pre-recorded information such as the manufacturer's name, or address information for finding the specific position of the recordable guide groove, and the rotational speed of the disc Frequency information used for control is recorded in advance at specific positions.

This recordable optical disc is devised so that use (recording) can be started immediately after purchase. This can be performed by recording the previously 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 emboss pits when the disc master is cut, and the disc substrate of the recordable optical disc is formed by forming a disc substrate using a metal matrix created by the disc master. Recorded at a specific position on the substrate (such as the lead-in area of the disc). If the recorded information is not recorded when the disc master is cut, a pit or mark is recorded using a recorder that records the recorded information at the time of shipment after the recordable optical disc is produced. Are additionally recorded at the above-mentioned specific positions.
(2) On the other hand, the address information described above is recorded as LPP in a specific portion of the guide groove widened.
(3) Further, the frequency information described above is recorded as a wobble frequency obtained by slightly shaking the guide groove in the radial direction.

The recording of the previously 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 to a thickness corresponding to the depth of the guide groove on a smoothly polished glass plate. If the recording type optical disc is a DVD-RW disc, the photosensitive resist is uniformly applied to a thickness of about 30 nm on the glass plate.

Next, the glass disk (resist disk) on which the photosensitive resist is uniformly applied in this way is carried to a cutting device. The cutting device is equipped with a laser beam control device that turns the cutting laser beam emitted from the light source into intermittent light or slightly shakes it in the radial direction (left and right). After the registration board is mounted in the predetermined position of the cutting device,
By irradiating the resist board with intermittent light or a cutting laser beam that is slightly vibrated in the radial direction, the above-mentioned recorded information, address information, and frequency information are recorded at their specific positions.

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

Thus, after cutting the resist disk, the resist disk is developed, and shape information (the previously recorded information, address information, frequency information, guide grooves) is deposited as a shape change. The developed resist board is coated with a conductive thin film, and the above-described shape information on the resist board is transferred onto the plating board using electroplating. By processing this plating machine into a desired size and making it a metal mold, using the injection molding machine equipped with this metal mold, the above-mentioned shape information is transferred as a shape change on the plastic substrate, A disk substrate of the recording type optical disk described above is obtained.

The portion of the disk substrate on which the above-described shape change is transferred is called an information surface. A functional film for recording is formed on the information surface, and recording is performed through various post-processings thereafter. Type optical disc is created. By the way, in the disk substrate obtained by injection molding using the above-described metal matrix, the guide grooves and pits have the same depth over the entire disk substrate.

As described above, the guide groove of the recordable optical disc is formed with a depth necessary for tracking guidance during recording. Therefore, if the signal from the record mark recorded during reproduction is to be extracted to the maximum extent, Decrease in reflectance due to the phase difference of reflected light caused by the difference in depth from the groove land becomes a problem. In land / groove recording as used in a DVD-RAM disc that can be rewritten repeatedly, the guide groove is within the allowable range to reduce crosstalk between tracks between the land (between the guide grooves) and the groove (guide grooves). In general, the depth of the guide groove is generally shallower than the depth at which the guide signal from the guide groove is extracted most efficiently (1/8 wavelength of the reproduction wavelength). Is. The tracking operation to the guide groove is performed by the push-pull method.

On the other hand, in a DVD-ROM disc which is a read-only disc, the pit depth is set near the depth at which diffraction by a laser beam is efficiently performed so that a reproduction signal as large as possible can be obtained (1 of the reproduction wavelength). / 4 wavelength vicinity). For this reason, the tracking operation is performed by the phase difference method because a signal necessary for tracking cannot be sufficiently obtained by the push-pull method for the pit row.

As described above, the DVD-RAM disc, which is a recordable optical disc, has a guide groove depth that allows efficient recording / reproducing operation, and the DVD-RAM, which is a read-only disc.
The ROM disk has a pit depth that is convenient for reproduction.

The following two methods (1) and (2) are conceivable as a method of providing guide grooves and pits having different depths on the disk substrate of one recording type optical disk.

(1) As a first method, as shown in FIG. 7, when cutting the resist board, a cutting laser beam for forming pits and guide grooves when cutting the resist board (referred to as laser A for convenience). In other words, a depth convenient for pit reproduction is formed with one output, and a shallow groove convenient for recording a guide groove is formed with the other output. However, in this cutting method, since the bottom surface of the shallow guide groove does not reach the glass master disk below the resist, the bottom surface of the guide groove is determined by the output distribution of the laser A, not the glass master disk. For this reason, the shape of the bottom surface of the guide groove is not flat but a funnel shape. Actually, the output distribution of the laser A becomes non-uniform with the beam center at the maximum, so that the uniformity of the bottom surface of the guide groove is difficult to obtain, and the signal characteristics of recording and reproduction are greatly deteriorated.

In FIG. 7 and FIG. 8, and in the following description, “LPP” indicates “land prepit” formed on the land, and for convenience, the laser B is described as laser light output for forming the land prepit.

(2) Next, as a second method, a cutting laser beam (laser A) for forming pits and guide grooves when the resist board is cut as shown in FIG.
And another cutting laser beam (laser B) for forming land prepits. A pit and a guide groove having the same depth are formed using a laser A having a constant output (the bottom surfaces of the pit and the guide groove reach the glass master disk under the resist). Further, the resist adjacent to both ends of the guide groove is exposed to an arbitrary height using the laser B, and the relative depth of the guide groove is adjusted. With this method, since the bottom surface of the guide groove is the surface of the glass master, the shape of the bottom surface of the guide groove is flat. Can do.

However, in this second method, if the boundary portion where the pit row is switched to the guide groove and the guide groove to the pit row is reproduced, the height of the resist between the two pit rows and the pit row to the guide groove (Or between the guide groove and the pit row), because the resist height is different, the pit row-
Disturbances such as missing or different amplitudes of pit signals and land pre-pit signals and differences in amplitudes, tracking signal amplitude differences such as push-pull methods, and occurrence of offset Occurs.

As described above, when both a pit row having a depth convenient for reproduction and a guide groove having a depth convenient for recording / reproduction exist in one recording-type optical disc, the recording / reproduction characteristics of the guide groove In order to ensure a sufficient thickness, it is desirable to design the bottom surface of the glass groove so that the surface of the glass master comes to the bottom surface of the guide groove. It was also found that there is a recording device that, when playing the part that switches from the pit row to the guide groove and from the guide groove to the pit row, lacks the pit signal and disturbs the push-pull tracking of the playback 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 resist thickness adjustment of the adjacent guide groove, and the signal cannot be taken out correctly, and the pit row and the guide groove are adjacent. The signal information of all the pit rows was missing. In such a recording device in which the tracking is disturbed, the tracking control signal becomes an abnormal value at the switching portion from the pit row to the guide groove and from the guide groove to the pit row, the tracking is lost, and the playback track position moves by several tens of tracks or more. In some cases, recording / reproduction from the desired location becomes impossible.

In this way, in order to be able to record information that cannot be rewritten in a pit row with a single recordable optical disc, a sufficient reproduction signal can be obtained by recording and reproduction in the guide groove,
The groove depth of the guide groove and the pit depth of the pit row need to be optimum depths respectively, and the bottom surface of the guide groove and the bottom surface of the pit are both flat on the surface of the glass master, and both are recorded. There has been a demand for a disc that has excellent reproduction characteristics and can cope with recording and reproduction even if a pit signal is missing at the switching portion between the pit and the guide groove, and does not disturb the tracking signal in any way.

Therefore, the present invention particularly provides a bottom surface at the switching portion where the bottom surface positions of the guide grooves and pit rows formed on the disk substrate are both flat on the same plane and change from the pit rows to the guide grooves or from the guide grooves to the pit rows. An intermediate area consisting of pit rows whose height varies between the height from the side to the side of the guide groove and the height from the bottom surface to the side of the pit row is provided, and this intermediate region is designated as a differential push-pull tracking method or position. By reproducing by the phase difference method, it is possible to obtain both good reproduction information from the reproduction-only pit row and good reproduction information from the recording / reproducing guide groove, and always obtain optimum tracking characteristics even in an unrecorded area. Therefore, the optimum tracking characteristic can always be obtained even in the recorded area. An object of the present invention is to provide an information recording medium capable of stably reproducing the copyright protection information of the reproduction-only pit row and recording the content based on this information.

Hereinafter, the information recording medium of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged cross-sectional view for explaining a first embodiment of the information recording medium of the present invention. FIG. 2 is a diagram for explaining that data to be recorded on the information recording medium of the present invention is made into an ECC block. 3 is a diagram for explaining recording of ECC-blocked data in a predetermined area of the information recording medium of the present invention in units of sectors, and FIG. 4 is a DVD-RW which is an embodiment of the information recording medium of the present invention. 1 in
FIG. 5 is a diagram showing a physical format of a sector, FIG. 5 is a diagram showing a lead-in area and a data area of the information recording medium of the present invention, and FIG. 6 is an enlarged sectional view for explaining a second embodiment of the information recording medium of the present invention. 7 is a diagram for explaining an example of the cutting state in the information recording medium, and FIG. 8 is a diagram for explaining another example of the cutting state in the information recording medium.

In the following description, DVD-RW is used as an embodiment of the information recording medium of the present invention, and information is recorded on this DVD-RW. However, other recordable CDs are described.
It goes without saying that the present invention can also be applied to high-density optical disks such as −RW, DVD + RW, etc., and next-generation DVDs.

An embodiment of the present invention is described in A. “Embodiment of Recording Format”, B.I. Description will be made in the order of “disc embodiments”.
A. "Embodiment of recording format"
First, “an embodiment of a recording format” will be described.
First, a general physical format when recording information is recorded on a DVD-RW and error correction processing in the recording 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.

In general, recorded information recorded on a DVD-RW is a data sector 20 shown in FIG.
Are formed to form a physical structure including a plurality of. In one data sector 20, ID information 21 indicating the start position of the data sector 20 and the ID information 2
ID information error correction code (IED) 22 for correcting 1 error, spare data (for example, CPM) 23, data area 24 for storing main data to be recorded, and data area 2
4 and an error detection code (EDC) 25 for detecting an error in
Recording information to be recorded is configured by a plurality of data sectors 20 being continuous.

Next, the processing when an ECC block is configured using this data sector 20 is shown in FIG.
A description will be given using B). When configuring an ECC block using the data sector 20,
As shown in FIG. 2B, first, one data sector 20 is divided horizontally by 172 bytes, and the divided data (hereinafter referred to as data blocks 33) are arranged in the vertical direction. . At this time, 12 rows of data blocks 33 are arranged in the vertical direction.

A 10-byte ECC for each horizontal data block 33 arranged in the vertical direction
An inner code (PI (Parity In) code) 31 is added to the end of the data block 33 to form one correction block 34. At this stage, the correction blocks 34 to which the ECC code 31 is added are arranged in 12 rows in the vertical direction. Thereafter, this process is repeated for 16 data sectors 20 minutes. Thereby, the correction block 34 of 192 rows is obtained.

Next, with the correction blocks 34 of 192 rows arranged in the vertical direction, the correction block 34 of the 192 rows is divided in the vertical direction from the beginning for each byte, and each divided data is divided. On the other hand, 16 ECC outer codes (PO (Parity Out) codes) 32 are added. Note that the ECC outer code 32 is also added to the portion of the ECC code 31 in the correction block 34.

As a result of the above processing, one ECC block 30 including 16 data sectors 20 is obtained as shown in FIG.
It is formed as shown in B). At this time, the total amount of information included in one ECC block 30 is (172 + 10) bytes × (192 + 16) rows = 37856 bytes, and the data recorded in the actual data area 24 is 2048 bytes. X16 = 32768 bytes.

In the ECC block 30 shown in FIG. 2B, 1-byte data is converted into “D #.
* ". For example, “D1.0” indicates 1-byte data arranged in the first row and 0th column, and “D190.170” indicates 1-byte data arranged in the 190th row and 170th column. Show. Accordingly, the ECC inner code 31 is arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.

Furthermore, one correction block 34 is continuously recorded on the DVD-RW. Here, FIG.
As shown in FIG. 2B, the ECC block 30 is configured so as to include both the ECC inner code 31 and the ECC outer code 32. Correction of data arranged in the horizontal (horizontal) direction in FIG. This is because the ECC inner code 31 is used to correct the data arranged in the vertical (vertical) direction in FIG. That is, in the ECC block 30 shown in FIG. 2B, it becomes possible to perform error correction twice in the horizontal (horizontal) direction and the vertical (vertical) direction, which is used for a conventional CD (Compact Disk) or the like. It is configured to perform error correction more powerfully than the error correction processing.

More specifically, for example, one correction block 34 (including a total of 182 bytes of data including the ECC code 31 for one row, as described above, is continuously recorded on the DVD-RW. If it is up to 5 bytes, it can be corrected even if it is destroyed by a scratch or the like, but if it is 6 bytes or more and all of one column is destroyed by a DVD-RW scratch or the like, E
The intra-CC code 31 cannot be corrected. However, even if all the columns are destroyed by scratches or the like, when viewed from the vertical direction, only one byte of data is destroyed for the ECC outer code 32 of one column. Therefore, if error correction is performed using the ECC outer code 32 of each column, even if all of one correction block 34 is destroyed, correct error correction can be performed and reproduction can be performed accurately. However, considering the occurrence of acquired scratches and the like, it goes without saying that if the damage in the row (horizontal) becomes large, it will lead to an error in the next vertical row (horizontal), so that it will be kept to a minimum. Incidentally, this vertical error can be corrected even if there are 8 vertical columns (16 columns by erasure correction).

Next, how the data sector 20 configured in the ECC block 30 shown in FIG. 2B is specifically recorded on the DVD-RW will be described with reference to FIG. In FIG. 3, data indicated by “D #. *” Corresponds to the data described in FIG.

When recording the ECC block 30 on a DVD-RW, first, as shown in FIG. 3A, the ECC blocks 30 are arranged in a line in the horizontal direction for each correction block 34 and interleaved. It is divided into 16 recording sectors 40. At this time, one recording sector 40 includes 2366 bytes (37856 bytes ÷ 16) of information, and the data sector 20 and the ECC inner code 31 or the ECC outer code 32 are mixed therein. However, ID information 21 (see FIG. 2A) in the data sector 20 is arranged at the head of each recording sector 40.

One recording sector 40 is 91 as shown in FIGS. 3 (B) and 3 (C).
The data is divided into data 41 for each byte, and a sync H is added to each. Thereafter, the recording sector 40 in this state is subjected to 8-16 modulation, whereby one sync frame 42 is formed for each data 41. At this time, one sync frame 42 is composed of a sync H ′ and data 43 as shown in FIG. The amount of information in one sync frame 42 is 91 bytes × 8 × (16/8) = 1456 bytes, and information is written to the DVD-RW disc in a form in which the sync frames 42 are continuous. At this time,
One recording sector 40 includes 26 sync frames 42.

This will be explained together with FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. In other words, the row is 172 bytes of data PI
10 bytes and 4 bytes of sync are 186 bytes, and 13 rows are obtained by adding one row of PO to 12 columns. There are 26 syncs of 2 bytes from H0 to H25.

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

B. "Disk Embodiment"
A characteristic intermediate region in a recordable optical disc as an example of the information recording medium of the present invention is a disc substrate created based on the resist board shown in FIG. 1 as the first embodiment and shown in FIG. 6 as the second embodiment. A read-only area (area P1, P2) in which pit rows PA and PB are formed, a record / playback area (area 1) in which a guide groove 1 is formed, and a read-only area (area P1). ) And the reproduction-only area (area P2) or the reproduction-only area (area P1)
) And a recording / reproducing area (guide groove 1).

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

The depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate area is, for example,
As shown in FIG. 1, the land depth (optical depth, pit row P) on the read-only area (area P1) side is shown.
From the depth of the land in the region P1 with respect to the bottom surface (the glass master side) of M, the depth a in FIG. 1, the land depth (optical depth, the bottom surface of the pit row PM (region P2) ( The land depth of the region P2 with respect to the glass master side) is configured to be reduced to the depth b) of FIG.
The depth (optical depth) of the pit PM with respect to the bottom surface of the pit row PM in the intermediate area is, for example, the depth of the land (optical depth, pit) on the read-only area (area P1) side as shown in FIG. Row PM
From the depth of the land in the region P1 with respect to the bottom surface (glass master side), the depth c in FIG. 6, the land depth (optical depth, the bottom surface of the pit row PM (guide groove 1)) Glass master side)
The depth of the land in the region 1 is reduced to the depth d) in FIG.

By the way, as described above, even in the case of a recordable optical disk, a disk capable of obtaining a sufficient reproduction signal by recording / reproduction in the guide groove and recording information that cannot be rewritten by the pit row is equal to the groove depth of the guide groove. The pit depth of the pit row needs to be the optimum depth, and the bottom surface of the guide groove and the bottom surface of the pit are both on the surface of the glass master, and the recording / reproduction characteristics are excellent. It is necessary that the disc has no pit signal loss and no tracking signal disturbance in the switching portion.

The present invention will be described below with reference to the drawings.
1 and 6 are diagrams for explaining a cutting state in an embodiment of an optical disc 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 have different depths by exposing the resist in the guide groove, and the bottom surface of the guide groove and the pit row depth is formed by the glass master surface. A recording type optical disc is proposed in which a resist exposure laser output is changed to change the height of the guide groove at a portion where the pit row switches to the guide groove and from the guide groove to the pit row. In particular, in FIGS. 1 and 6, a signal in the range of an amplitude difference and an offset level in which a differential push-pull and a DPD (differential phase detect) tracking error signal are allowed can be obtained in the intermediate region.

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

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

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

As shown in FIG. 1 or 6, a guide groove 1 having a bottom surface on the surface of the glass master on the resist plate R
Is a laser beam intensity (PA1) suitable for recording a guide groove using a laser (beam) A.
) Is recorded. At this time, the bottom surface of the guide groove 1 is exposed to the surface of the glass master. Guide groove 1
Is slightly wobbled at a predetermined frequency. The laser beam B is necessary for the guide groove 1 because there is a resist thicker than the resist thickness necessary for forming an appropriate guide groove depth on the side of the guide groove (between the guide groove 1 and the guide groove 1 and the land). Recording is performed with laser light intensity (PB1) so that a resist with a sufficient thickness remains. Furthermore, the laser beam intensity required for land pre-pit formation is output during land pre-pit recording.

At this time, a pinhole or the like is inserted on the beam expander 9 for deriving the laser (beam) B, and the laser (beam) B reduces the beam system introduced into the objective lens 12,
A device for increasing the spot of the laser (beam) B that is focused on the resist board may be incorporated, and for example, a device for exposing one track width may be incorporated. 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 is guided using the laser (beam) A. 2
Is exposed at a laser beam intensity (PA3) suitable for recording. At this time, it is desirable to expose the bottom surface of the guide groove 2 to the surface of the glass master, but it is not particularly defined. Further, a guide groove 1 is formed in the side of the guide groove portion (between the guide groove and the guide groove, land) using a laser (beam) B.
The same resist thickness as in (Area 1) remains, and the resist thickness gradually increases in the pit row PB.
In the guide groove 1 adjacent to the pit row PB (region P2), the resist thickness is the same as that of the pit row PB (region P2) with the laser light intensity (PB3) so that the resist having the necessary thickness remains in the (region P2). It is formed with the laser light intensity. Furthermore, the laser beam intensity required for land pre-pit formation is output during land pre-pit recording. At this time, the laser (beam) B may be slightly wobbled at a predetermined frequency.

Subsequently, an area P having identification data or the like indicating a recordable optical disk has a pit row PA.
First, using a laser (beam) A, a laser beam intensity (PA2) suitable for recording pits and exposing all the resist thickness directions is recorded and exposed to the glass master surface. At this time, the pit row PA is slightly wobbled at a predetermined frequency. In some cases, no wobble is required.

In this way, the recording / reproduction area (area 1) to the reproduction-only area (areas P1, P2), the recording / reproduction area (area 1), and the intermediate area are provided.
Guide grooves, pits, and land bripits LPP (address information) are recorded.

In the next development process, this latent image is deposited as a shape change and is carried to a metal master production process.
In the metal master production process, a conductive film such as nickel is coated on the resist board R described above,
A nickel film is formed thereon by nickel plating or the like. Thereafter, the metal master made of nickel is peeled off from the resist board R, and the peeled metal master is cleaned and processed into a size that can be mounted on a molding die. The processed metal master is called the master. A mold is mounted on a molding die, and a plastic disk substrate is formed by molding.

Thereafter, a recording functional film (recording layer) is formed on the disk substrate. For example, a protective film is applied thereon, or a substrate called a dummy substrate is bonded to manufacture a recording disk.

The first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 6 are created in substantially the same manner, but in FIG. (
6 is different from FIG. 6 in that an intermediate region is formed as a pit region (pit row PM) between a region P1 (pit row PA) and a region 1 which is a recordable region. .

The depth (optical depth) of the pit row PM in this intermediate area is the same as or less than the depth (optical depth) of the area P1 (optical depth), and cannot be accurately defined. (Optical depth).

Next, an embodiment of disk formatting will be described. Type shown in FIG.
e (Type) 1 is a reproduction-only pit P on the right side of the disc described later using the comparative example of FIG.
A state is shown in which the track of the area is continuously switched to the recordable groove G (groove) area on the left. In FIG. 8, “LPP” indicates “land prepits” formed on the land, and laser B is a laser beam output for forming land prepits. FIG. 1 and FIG. 6 show that the depth changes between the track in the right reproduction-only pit area and the left recordable groove G (groove) area on the disc, which will be described later as type (type) 2 in FIG. It shows that there is an area having a pit which is an intermediate area.

FIG. 5 shows the structure from the lead-in area (inner circumferential direction) to the data area (outer circumferential direction) of the disk in the embodiment of the present invention. As described above, the disc manufacturing method is different in this area, and two types of type (type) 1 described in the comparative example and type (type) 2 described in the present embodiment coexist as formats. It is configured to be able to.
In this format, the signal performance (recording / reproduction characteristics) is not so good in type (type) 1, but it can be manufactured relatively easily. In type (type) 2, the signal performance (recording / reproduction characteristics) is preferable, but the intermediate region is used. The coexistence of two methods that require restrictions on the signal performance in the manufacturing method can give a degree of freedom to the manufacturing method.

The lead-in area of type (type) 1 is
(1-1) Land pre-pits L having information such as addresses from the inner circumference, which is a recordable / reproducible area, to the land area on the outer circumference side of the groove area having a depth of about λ / 12.
Initial zone, system reser that is a recordable / reproducible area having PP and that can obtain a differential push-pull tracking error signal.
bed zone, buffer zone 0, RW-physical format
information zone, reference code zone, bu
fer zone 1, linking loss area, (1-2) DPD tracking error signal consisting of pre-pits with wobbles but no land pre-pits LPP can be obtained and recorded signals can be read. Control data zone which is a read-only area and has information on copyright protection and lead-in information
e (Readable emboss without LPP), (1-3) about λ / 1
Unreadable emboss zone with LPP, which is a read-only area in which a DPD tracking error signal consisting of prepits having wobbles and land prepits LPP having a depth of about 2 is obtained and a recorded / reproduced signal cannot be read.
(1-4) A recordable / reproducible area having land pre-pits LPP having information such as addresses in the land area on the outer peripheral side of the wobble and groove areas, and a differential push-pull tracking error signal can be obtained. buffer zone2,
Subsequent data areas are recorded in the order of the data area for recording the user content. Here, the start address of each area is shown in the upper right of each area. The operation at the time of recording of type (type) 1 is shown by Write Mode on the left side of FIG. 5, and the operation at the time of reproduction is shown by Read Mode on the left side of FIG. “recording” indicates a recording operation, “reading” indicates a reproduction operation, “seek” indicates a seek operation or an operation for skipping a track, and “read gen wclk” indicates an operation for reproducing a wobble signal and an LPP address to generate a recording clock signal and a recording timing signal. ing.

Next, type (type) 2 lead-in area (2-1) addresses from the inner circumference, which is a recordable / reproducible area, to the land area on the outer circumference side of the groove area having a depth of about λ / 12. Is a recordable / reproducible area having a land pre-pit LPP having the above information, and a differential push-pull tracking error signal can be obtained.
initial zone, system reserved zone, buffer
zone0, RW-physical format information zone
e, Reference code zone, (2-2) boundary flag zone 1 (which may be omitted) in which a code for determining whether it is type 1 or type 2 is recorded, and boundary emboss zone 1 (about λ /
A pit region formed so as to have a depth of about λ / 4 from a depth of about 12 and has a wobble so that a differential push-pull tracking error signal and a DPD tracking error signal can be obtained), (2-3 ) Information relating to copyright protection, which is a read-only area in which a DPD tracking error signal consisting of prepits having a depth of about λ / 4 but having wobbles but not having land prepits LPP is obtained and recording signals can be read out. And control data zone (Readable embo with lead-in information)
ss without LPP), (2-4) boundary flag zone 2 in which a code for determining whether type (type) 1 or type (type) 2 is recorded
(May be omitted), a boundary embo having a structure opposite to the intermediate region described above
ss zone2 (a pit area formed to have a depth of about λ / 4 to a depth of about λ / 12, in which wobbles and LPP are recorded (LPP may be omitted) differential push (2-5) A DPD tracking error signal composed of a pre-pit having a wobble and a land pre-pit LPP having a depth of about λ / 12 is obtained. An unreadable emboss zone that is a read-only area where the recorded signal cannot be read.
With recording / reproduction capable of recording / reproduction with a land LPP having information such as address in the land area on the outer peripheral side of the groove area having a width LPP, (2-6) wobble and a depth of about λ / 12 The area is divided in the order of the buffer zone 2 from which a push-pull tracking error signal is obtained and the data area in which the user content is recorded. Here, the start address of each area is shown in the upper right of each area. The operation when recording type 2 is shown on the right side of FIG.
The operation during playback is indicated by Read Mode on the right side of FIG. reco
rding indicates a recording operation, reading indicates a reproduction operation, seek indicates a seek operation, or an operation of skipping a track, read gen wclk indicates a wobble signal and LPP
An operation of reproducing an address to generate a recording clock signal and a recording timing signal is shown.

Boundary flag zone 1 and boundary flag zone
2 may not be in this position, but boundary zone 1 and boundary
flag zone 2 is the disk type (type) 1 or type (type) 2
Control da having the lead-in information to change the recording / reproducing method
Type and type (type) 1 or type (type) of the disc to be recorded / reproduced by pre-embedding and recording together with address information of L zone and LPP in the recordable area
2 can be determined.

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

FIG. 9 shows the track number 1 to the track number 9 in the direction of the outer circumference, and the correspondence with FIG. 5 is that the track number 1 of type (type) 1 and the track number 2 are about λ. / 12 is a recordable / reproducible area having land prepits LPP having information such as addresses in the land area on the outer peripheral side of the groove area having a depth of about / 12, and a differential push-pull tracking error signal is obtained. Ini
tial zone, system reserved zone, buffer zo
ne0, RW-physical format information zone,
Reference code zone, buffer zone 1, linking
loss area and the like. The wobble signal is arranged in all the regions shown in FIGS.
Each track number 3 and track number 4 has a depth of about λ / 4 and a DPD tracking error signal composed of pre-pits having no land pre-pit LPP is obtained, and the recording signal can be read out. Area control data zo
ne (Readable emboss without LPP).
Each track number 5, track number 6, track number 7 is about λ / 12
Unread, which is a read-only area where a DPD tracking error signal consisting of a pre-pit having a land pre-pit LPP having a certain depth is obtained and a recorded signal cannot be read out
It is an emblem zone with LPP.
Information that can be recorded / reproduced so that each track number 8 and track number 9 can obtain a differential push-pull tracking error signal having a land pre-pit LPP having information such as an address in the land area on the outer peripheral side of the groove area. This is a recordable / reproducible area (Data area).

Next, the track of type 2 (track number 1) is addressed to a land area on the outer peripheral side of the groove area having a depth of about λ / 12 from the inner periphery where the lead-in area is a recordable / reproducible area. An initial zone, a system reserved zone, and a buff that have a land pre-pit LPP having the information of
er zone0, RW-physical format information
zone, Reference code zone, and the like.
The track with track number 2 is the intermediate area.
A read-only area in which the track number 3 and track number 4 have a depth of about λ / 4 and a DPD tracking error signal composed of pre-pits having no land pre-pits LPP is obtained and the recorded signal can be read out. The control data zone
e (Readable emboss without LPP).
The track with track number 5 is the intermediate area.
A read-only area where each track number 6 and track number 7 has a DPD tracking error signal having a pre-pit having a land pre-pit LPP having a depth of about λ / 12 and a recording signal cannot be read out. Unreadable embo
ss zone with LPP.
A recordable / reproducible area in which each track number 8 and track number 9 has a differential push-pull tracking error signal having land prepits LPP having information such as addresses in the land area on the outer peripheral side of the groove area. (Data
area).

In this arrangement, when recording or reproduction is performed, type (type) 1 or type
(Type) 2 must be determined. type (type) 1 or type (type) 2
As a detection method, when the disk 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 reproduced in this area.
If 1 or type (type) 2 is recorded, it is determined by this value. This can be read out in the same way by the recording device or the reproducing device. Further, in another example of the present embodiment, the boundary flag zone 1 and the boundary flag zone
Since type 2 or type 2 is recorded as an LPP in e2, it can be determined by reading this value during recording. This method can be applied when recording is performed by a recording apparatus. 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.

Now, when recording type (type) 1 in order from the track of track number 1 (FIG. 5).
(Write Mode shown on the left side of FIG. 2), track number 1, track number 2, track number 8, and track number 9 are tracks to be recorded. As described above, wobbles are provided on both sides of tracks in all areas. The frequency signal is detected and the speed signal for rotating the disk is fed back to control the disk at a constant linear velocity and generate a recording clock signal. 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 Write Mode shown on the left side of FIG. 5).
ing, Initial zone to Linking loss area). Then, the recording is stopped at the linking timing corresponding to the track corresponding to the track of track number 3, and the reproduction state (reading in the write mode shown on the left side of FIG. 5).
).

The track of track number 3 is composed of reproducible pits, and there is no LPP signal, but an address is detected from the reproducible pits and a replay operation is performed based on the addresses (FIG. 5).
Reading and Control data in Write Mode shown on the left side of
zone (Readable Emboss Without LPP)) Track number 4 is performed.
Next, each track number 5, track number 6, and track number 7 is a track in which a pit signal cannot be reproduced. In this area, there are a wobble signal and an LPP signal. The signal and the LPP address are reproduced, and the recording clock and recording timing are generated (readin in Write Mode shown on the left side of FIG. 5).
g gen wclk, Unreadable emboss with LPP), and starts recording at the linking timing in the same way for the tracks with track numbers after track number 8 and performs the subsequent recording processing (record mode in the Write Mode shown on the left side of FIG. 5).
ding, buffer zone 2 -Data area).
Here, in type (type) 1, both sides of the track are symmetrical with respect to each other, and each track with track number 2 and track number 3, each track with track number 4 and track number 5, and track number The tracking error signal by differential push-pull at the track boundary between track No. 7 and track number 8 can be obtained continuously with a certain amplitude difference.

As described above, since the boundary of the pit area can be continuously recorded, an RF signal can be continuously obtained during reproduction, and the processing during reproduction (Read Mode shown on the left side of FIG. 5) Are sequentially reproduced from the track number 1 to the track number 9 (reading, initial zone in Read Mode shown on the left side of FIG. 5).
~ Control data zone (Readable emboss witho)
ut LPP)). At that time, the track number 5, track number 6, and track number 7 cannot be reproduced, so skip reading (Read shown on the left side of FIG. 5).
Seek, Unreadable emboss with LPP in Mode
~ Buffer zone2), and then the tracks with track numbers after track number 8 are continuously reproduced (reading, Da in Read Mode shown on the left side of FIG. 5).
ta area).

Next, when recording type (type) 2 in order from the track of track number 1, each track of track number 1, track number 8, and track number 9 is a track to be recorded. The track of track number 2 that is an intermediate area is a recordable track in type (type) 1, whereas it is a track of pits in type (type) 2. Even if the wobble signal and LPP signal necessary for recording are recorded with different side land depths, the signal cannot be obtained with the signal amplitude or the signal offset level as in the previous track. This is because there is a possibility that the clock and timing signal cannot be obtained accurately.

Similarly, the track number 5 which is an intermediate area has different land depths on both sides of the track, and even if the wobble signal and the LPP signal necessary for recording are recorded, the signal amplitude as in the previous track is recorded. And at the offset level of the signal, there is a possibility that an accurate signal may not be obtained, and a recording clock and timing signal may not be obtained accurately. You may carry out with the track of the track number after track number 6.

The recording process (Write Mode shown on the right side of FIG. 5) will be described in order. Track number 1
In this track, there is a wobbled frequency signal on both sides of the track as described above.
The frequency signal is detected and a speed signal for rotating the disk is fed back to control the disk at a constant linear velocity and generate a recording clock signal. Next, LP recorded in the land
P 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 (recording in Write Mode shown on the right side of FIG. 5, Initial zone to boundary flag z).
start one).

Then, recording is stopped at the linking timing that becomes an address corresponding to the track of track number 2, and the reproduction state is set. The 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 order, boundary flag zone
2). The track number 3 is composed of reproducible pits in the recording area, and there is no LPP signal. However, an address is detected from the reproducible pits and tracks up to the reproduction track number 4 are performed based on the addresses (FIG. 5). Read in Write Mode shown on the right
ing, Control data zone (Readable emboss wi
second LPP) -boundary flag zone 2).

Next, since the track number 5 track may not be able to reproduce the pit signal, the LPP signal is skipped because it may not be reproduced accurately. Next, track number 5
The track number 6 and track number 7 are signals in which the pit signal cannot be reproduced. However, since there are a wobble signal and an LPP signal in this area, the wobble signal and the LPP address are set during reproduction of this track. Play and generate recording clock and recording timing (
Reading gen wclk, U in Write Mode shown on the right side of FIG.
nreadable emboss with LPP), recording is similarly started at the linking timing on the tracks with track numbers after track number 8 and the subsequent recording processing is performed (
Recoding and buffer zo in Write Mode shown on the right side of FIG.
ne2-Data area).

Here, in type 2 (type 2), the tracks 2 and 5 where both sides of the track are intermediate regions are also asymmetrical, and the tracking error signal of the push-pull method causes an amplitude difference or an offset in the track of this boundary. Although the recording or reproduction cannot be performed accurately, the tracking error signal by the differential push-pull method can be continuously obtained within a certain allowable range of amplitude difference.

If the area is arranged in this way, the boundary of the pit area can be recorded continuously,
RF signals can be obtained continuously during playback, and processing during playback (Read shown on the right side of FIG. 5).
Mode) uses a tracking error as a phase difference method (DPD) (which may be a differential push-pull) and sequentially reproduces tracks from track number 1 to track number 9. At this time, in type (type) 2, track number 2, track number 5,
Since the track number 6 and the track number 7 cannot be reproduced, they are skipped (see seek and Initial zo in Read Mode shown on the right side of FIG. 5).
ne ~ boundary emboss zone 1, boundary flag
zone 2 to buffer zone 2), and thereafter, the tracks of track number 3, track number 4, and track numbers after track number 8 are continuously reproduced (reading, Control da in Read Mode shown on the right side of FIG. 5).
ta zone (Readable emboss without LPP) ~ bou
nary flag zone 2, Data area).

Also, if type (type) 1 and type (type) 2 cannot be detected and type (type) 1 is detected, or type (type) 2 is typed by mistake.
This scheme is also effective when e (type) 1 is detected. In that case, in the case of recording,
The recording apparatus tries to perform recording processing on the track with track number 2. However, with the track number with track number 2, even if the wobble signal can be detected, LPP cannot be detected accurately, so recording is stopped halfway. . Alternatively, the recording process is performed while the LPP signal is complemented by the signal processing circuit. If all tracks with track number 2 have been recorded,
Since the tracking error signal can be obtained from this area during reproduction of this track, the reproduction signal cannot be read from the track of track number 2, but continuous reproduction is possible without any problem. Although there is a possibility that the LPP signal cannot be read from the track of track number 5 as well, since it is read from the next track, recording and reproduction can be performed without any problem.

FIG. 10 is a diagram for explaining the lead-in area and the data area of the information recording medium according to the third embodiment of the present invention. Buffer zone of type 2 shown in FIG.
e1 is unreadable emboss with LPP b in FIG.
The difference is that it is undary 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 type (type) 3. The type 3 recording and playback operations are shown as Write Mode and Read Mode on the right side of FIG. For this operation, unreadable emboss with LPP bound
Since it is the same as type (type) 2 except for the early flag 1, the description of the overlapping operation is omitted, but the description of the operation different from type (type) 2 is as follows. unr
The area of the embeddable with LPP boundary flag 1 is the same as the area of the embeddable with LPP, and the difference is that the boundary flag 1 is written in the LPP in this area.
In FIG. 10, the place to be recorded in buffer zone 1 is unreadable.
Since the emboss area is used, recording is terminated at the previous reference code zone, and the reproduction operation is switched. Since type (type) 1 is the same as type (type) 1 shown in FIG. 5, description thereof is 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 (type) 4 and the type (type) 5 shown in FIG. 11 are the boundary em of the type (type) 2 shown in FIG.
The boss zone 1 and the boundary emboss zone 2 are arranged at the same address position in the type (type) 1 and the type (type) 2 shown in FIG. Boundary emboss zone 1 and boundary emb
As described above, oss zone 2 is an area composed of embossed pits as shown in the comparison table shown on the right side of FIG. 11. In type (type) 4, wobble and LPP are recorded. , Type (type) 5 has wobble recorded but LP
P may not be recorded. Alternatively, the 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 reproduced. Identification information indicating type (type) 4 or type (type) 5 is recorded in advance in a reproduction-only area such as LPP or readable control data zone.

By adopting such a format, the recording operation (Write Mode in FIG.
) And the playback operation (Read Mode), as shown on the left side of FIG.
item mode is recorded until the linking loss area.
g) to switch to the playback mode (reading), unreadable emboss
A wobble signal is reproduced from the with LPP area, a clock for recording is generated, and L
An address signal is generated from the PP and a recording timing is generated (reading gen w
clk), and then resume recording from the buffer zone. Since the reproducing operation is the same as that in the above embodiment, the description thereof is omitted.

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

When classifying the type (type) of the disc described in each of the above-described embodiments, type (
Since type (type) 1 and type (type) 4 are in the same group, in the following description, type (type) 1 will be described as a representative. Also, type (type) 2, type
Since e (type) 3 and type (type) 5 are in the same group, in the following description, this will be described using type (type) 2 as a representative. With such a configuration, two different manufacturing methods of type (type) 1 and type (type) 2 can be allowed, and a tracking error signal can be continuously obtained during recording and reproduction. DVD-R, which has been released in the past, can be performed continuously without interruption during playback.
The added value of the DVD-RW is increased without affecting the OM and the DVD video playback device.

In the above embodiment, a boundary emb that consists of a pit area of one track that is an intermediate area between the reproduction-only area and the recording area or between the reproduction-only area and the reproduction-only area.
Although the oss zone 1 and the boundary emboss zone 2 are provided, it goes without saying that the area may be two or more tracks. As can be seen in FIG.
The difference between the type (type) 1 and type (type) 2 is negligible, and is the boundary area between the boundary area between the recording area and the reproduction-only area, the boundary emboss zone 1, the first reproduction-only area, and the second reproduction-only area. Boundary emboss zone 2 as a boundary area, or an area that may not be recorded if the address cannot be detected correctly, or
If it is defined as an area where the reproduction signal does not need to be read out accurately, type (type) 1 and type (type) 2 can be set to a common format. The name used here is one example, and the present invention is not limited to the manufacturing method, correction format, disk structure, and the like in this example.

FIG. 12 is a diagram for explaining the lead-in area and the data area of the information recording medium according to 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 e of the type (type) 4 shown in FIG.
mboss zone1 as boundary zone1, type (type) 6
Then, this area is a recordable groove area in which wobbles and LPPs are recorded, and t
In type 7, this area is an embossed pit area where wobbles can be recorded but LPP is not recorded, and boundary emboss zone 2 is shown in FIG.
Boundary emboss zone 1 and 2 shown in 1 wobble and LP
P is a recorded emboss pit area. In the case of type 7, even if the LPP is recorded, the LPP does not need to be read accurately. Identification information indicating that the type (type) 6 or type (type) 7 is LPP, or a control d that can be read.
It is recorded in advance in a read-only area such as data zone.

If the region is defined in this way, the type (type) 6 and the type (type) 7 can be set in a common format. At this time, there are cases where this area is recorded and reproduced, so even if there is no LPP address signal in this area, if a wobble signal is recorded in advance,
A spindle speed signal can be generated, and the LPP address signal can be complemented by a circuit to perform recording. Actually, in the case of recording of boundary zone 1, in the case of type 6, as shown in the table, the latter half of the two ECC blocks are set to Lin.
Record up to this point as king Loss Area.
The CC block is recorded as Linking Loss Area so far.

For the same reason, if a wobble signal is recorded in advance in the boundary emboss zone 2, a recording clock for recording can be continuously generated and a speed signal of the spindle can be generated. Type (type) 6 and type ( Type) 7 can be recorded and played back while maintaining compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal, and an offset also occurs in the wobble signal in a DC manner. If this offset signal is passed through a bandpass filter, the wobble signal is Since it is possible to obtain continuously without omission or to eliminate a short-time wobble signal, it is possible to eliminate this influence by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when recording / reproducing is performed, and a method of manufacturing two discs is made possible, which contributes to the development and popularization of such a format.

In addition, although it is common to all the embodiments, the boundary emboss zone
The e1 or the boundary zone 1 is formed by pits in the middle area of the disk-shaped disc, but the 2ECC block arranged as the middle area is a slightly larger area than the circumference. Thus, several sectors or several sync frames of the latter half ECC block are readable areas in the same manner as the control data zone which is the next area. Since at least two sync frames are secured in this area, when the control data zone is to be reproduced, the control data zone is accurately read from the beginning by pulling in the PLL of the reproduction signal and performing sync detection during this period. You can start f. Similarly, the boundary emboss zone 2 also has a 2ECC block arranged as an intermediate area that is 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 in the same manner as the unread emboss zone which is the next area.

By adopting such a format, the recording operation (Write Mode in FIG.
) And playback operation (Read Mode), as shown on the left side of FIG. 12, the description of the same processing as in the above embodiment is omitted, but the information of type 6 or 7 recorded in the LPP or control data area is used. If it is type 6 and the recording operation (Write mo
de) linking the last ECC block of boundary zone 1 to lo
ss area, recording to this point (recording), playback mode (ready)
ng), a wobble signal is reproduced from the unreadable emboss with LPP area, a clock for recording is generated, an address signal is generated from the LPP, a recording timing is generated (reading gen wclk), and then buffer z
Recording is resumed from one again. For type 7, recording operation (
Write mode) is the last ECC block before boundary zone 1 as a linking loss area, and is recorded so far.
Switch to the playback mode (reading), unreadable emboss wit
h A wobble signal is reproduced from the LPP area, a clock for recording is generated, an address signal is generated from the LPP, and a recording timing is generated (reading gen wclk).
Next, recording is resumed from the buffer zone. Also,
Even when a type 7 medium is recorded by the type 6 method on the assumption that the type 6 or 7 information recorded in the LPP or control data area is not obtained, the wobble signal is continuously generated. Therefore, continuous recording can be performed based on this signal even when an LPP signal cannot be obtained. In this case, when this area is reproduced, the recorded signal cannot be read, but there is no problem because it is information of one track and not information of an important information area. Since other reproduction operations are the same as those in the above embodiment, the description thereof is omitted.

FIG. 13 is a diagram for explaining the concept of the cutting state of the information recording medium according to the sixth embodiment of the present invention. FIG. 13 shows the same depth (position) of the bottom surface in the above description of the present invention.
In the sixth embodiment, the bottom surface of FIG. 13 is in the intermediate region having different guide grooves, and the pit row region and the bottom surface of the guide groove region are in the pit row direction from the guide groove direction. The bottom surface of the pit row is formed so as to be flush with the bottom of the guide groove. Compared with the conventional method, the modified part of the method for manufacturing in this way is performed roughly as follows.

In the switching portion between the guide groove and the pit row whose bottom surface is on the surface of the glass master, conditions for cutting the guide groove and the land pre-pit exposed to the surface of the glass master are used as initial conditions. The laser (light) A includes a wobble signal. The wobble signal was oscillated from side to side by the optical polarizer so that the wobble signal had an amplitude of 15 nm on the resist board. The laser light intensity was such that the width of the guide groove to be cut was 0.3 μm and the groove depth was about 30 nm (PA3). On the other hand, the laser (light) B has a laser beam intensity (PB3) at which a desired land prepit is formed, and the land prepit to be cut has a depth of about 30 nm.
It set so that it might become. Cutting was performed at a constant linear velocity. The turntable was controlled so as to correspond to the track pitch during one rotation of the resist disk and moved at a constant speed from the inner periphery to the outer periphery at 0.74 μm. Subsequently, each laser output was continuously changed while cutting the inclined portion of the three tracks. At this time, the laser (beam) A was controlled to reach a laser intensity suitable for recording a guide groove having a bottom surface that does 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 is oscillated from side to side by the optical polarizer so that the wobble signal has an amplitude of 15 nm on the resist board. The width of the guide groove to be cut is 0.3 μm, and the laser beam intensity is such that the groove depth is about 30 nm. The laser (beam) B is controlled so as to continuously reach the laser intensity necessary for forming the land prepits beside the guide groove.

Similarly, the switching portion between the pit row and the guide groove whose bottom surface is on the glass master surface is, as an initial condition, the laser (beam) A has a laser intensity suitable for recording a guide groove having a bottom surface that does not reach the glass master surface. Here, while cutting the 3-track inclination, control is performed so as to continuously reach the laser intensity suitable for recording the guide groove exposed to the surface of the glass master. Similarly, the laser intensity of the laser (beam) B light is set so that the depth is about 30 nm in the land pre-pit that is cut while cutting the 3-track inclination from the laser light intensity at which the desired land pre-pit is formed. Change continuously.

The track of the recordable intermediate area with the inclination of the disc manufactured in this way is
As described in the above embodiment, the push-pull method and the differential push-pull method as the tracking method may cause some offset, but recording and reproduction can be performed 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. In addition, after recording in this area, the differential phase detect (DP
D) With the method, tracking can be performed stably with almost no occurrence of offset or the like. In the above embodiment, when an intermediate area composed of pit areas is overwritten or depending on the pit shape of the intermediate area, an offset or the like may occur in the differential phase detect (DPD) method. In the example, the occurrence of this problem can be solved. In addition, since a wobble signal and an LPP address signal can be prepared in advance in this intermediate area, the recording operation of the signal to be written can be performed almost accurately, and the reproduction operation of the reproduction signal is also stable. Can be done.

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.
The type (type) 8 shown in FIG. 14 is substantially the same as the type (type) 6 shown in FIG. 2, and the type (type) 8 shown in FIG. 14 is wobbled in the boundary zone 1 of the type (type) 7 shown in FIG. Can be said to be recorded, but LPP is an embossed pit area that is not recorded, whereas type (type) 8 is a recordable groove area that is inclined as described above and in which wobbles and LPPs are recorded. The LPP in this area is an area where the LPP does not need to be read accurately even if it is arranged. boundary embos
s zone2 is a wobble and LPP similar to the boundary emboss zone 2 shown in FIG. 12, and the embossed pit area is recorded.
Even if P is recorded, it is an area where the LPP does not have to be read accurately. type (type)
Identification information indicating 6 or type (type) 8 is recorded in advance in a reproduction-only area such as LPP or readable control data zone. For example, the identification information is set to 0: b in Media type 3 (media type) of Disc Physical code of LPP information.
No oundary 1: Can be defined as having a boundary.

If the area is defined in this way, the type (type) 6 and the type (type) 8 can have a common format. At this time, when this area is recorded and reproduced, even if the LPP address signal cannot be detected in this intermediate area, the spindle speed signal can be generated from the wobble signal, and the LPP address signal can be generated in a circuit form. It is possible to supplement and record. Actually, in the case of recording of boundary zone 1, the ECC block of 2F1F0h is linked to Linking Loss Ar in both cases of type 6 and type 8.
Recording is performed so far as ea.

For the same reason, if a wobble signal is recorded in advance in the boundary emboss zone 2, a recording clock for recording can be continuously generated and a speed signal of the spindle can be generated. Type (type) 6 and type ( Type) 8 can be recorded and reproduced while maintaining compatibility. In this case, in the intermediate region, an offset occurs in the push-pull signal, and an offset also occurs in the wobble signal in a DC manner. If this offset signal is passed through a bandpass filter, the wobble signal is Since it is possible to obtain continuously without omission or to eliminate a short-time wobble signal, it is possible to eliminate this influence by complementing the continuity of the wobble signal with a circuit. By adopting such a configuration, compatibility is maintained when recording / reproducing is performed, and a method of manufacturing two discs is made possible, which contributes to the development and popularization of such a format.

By adopting such a format, the recording operation (Write Mode in FIG.
) And the playback operation (Read Mode), as shown on the left side of FIG. For type 6 and 8, recording operation (Write
mode) is the linking of the last ECC block of boundary zone 1
loss area, recording to this point (recording), playback mode (rea
), a wobble signal is reproduced from the unreadable emboss with LPP area, a clock for recording is generated, an address signal is generated from the LPP, a recording timing is generated (reading gen wclk), and then a buffer
Recording is resumed from the zone again. Type 8 and boon
If the push-pull method is used as a tracking error when recording to the darly zone 1, an offset signal within an allowable range for the tracking error signal is generated. In addition, it is possible to perform recording more accurately by performing control so as to cancel the offset in accordance with this value. Also, if a type 7 medium is recorded by the type 6 method on the assumption that the type 6 or 8 information recorded in the LPP or control data area is not acquired, the wobble signal is continuous. Therefore, continuous recording can be performed on the basis of this signal even when an LPP signal cannot be obtained.

The representation of boundary zone 1 and 2 described here is an area sandwiched between areas having substantially different depths, and thus is represented in this way. However, as a different expression method, it is represented as a normal data area. You may do it. In particular, the difference between Type 6 and Type 8 is slight and expressed as a normal data area. As a characteristic of the data therein, for example, the jitter of the reproduction signal of Type 6 is 8% or less. The playback signal jitter is 10% or less, the error rate of the type 6 LPP playback signal is a% or less, but the error rate of the type 8 LPP playback signal is b% or less, Although the tracking signal offset is c% or less, the difference in data such as the type 8 tracking signal offset being d% or less may be defined as the type difference. As a different expression method, the standard value defined for the normal data area is not defined accurately for both type 6 and type 8, so that the two types are expressed in common. There is a way. Further, in this embodiment, the boundary zone 1 region is configured to gradually change the depth, but the boundary zone 2 is also configured only with pits.
You may comprise so that a depth may be changed gradually.

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 has already been described and is omitted, but the differences are as follows.
That is, when the difference is considered with a large field of view, the type (type) 6 shown in FIG. 14 is the type (type) 6 shown in FIG. 12, the type (type) 1 shown in FIG. The type (type) 8 shown in FIG. 14 is substantially the same only by changing.
If the boundary zone 1 is a recordable groove area that is inclined as described above and in which wobbles and LPPs are recorded, it is the same area as the buffer zone 1 of type 1 and can be defined as buffer zone 1. it can. Similarly, FIG.
Boundary emboss zone 2 shown in FIG. 4 is also an embossed pit area where wobbles and LPPs are recorded.
Since it is the same area as the th LPP area, it is unreadable emboss w
h It can be defined as LPP region.

With this definition, type 6 and type 8 in FIG. 14 can be the same as type 1 in FIG. There is no flag indicating type 6 and type 8 described in FIG. However, two boundary areas where two boundary zones existed as the positional relationship of FIG. 14 (this boundary track is one track near the boundary of a reproduction-only track composed of tracks or pits in a recordable area) (Or several tracks), as described above, the push-pull tracking error signal in the tracking error signal may be different from the amplitude level and offset level of the normal signal region.

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 in FIG.
And the peak value P2 in the downward direction, and the peak value P in the upward direction based on the center voltage in the region near the boundary.
3 and the downward peak value P4,
Let P3 / (P1 + P2)> 0.2 and P4 / (P1 + P2)> 0.2.
This numerical value of 0.2 is a value necessary to prevent tracking and other controls from becoming unstable when recording or reproducing this area even when the amplitude of the push-pull tracking error signal becomes small. Note that the value of 0.2 is 0.
A range of about 15 to 0.3 is desirable.
For example, in the recordable area other than the boundary area, the value of the offset amount of the amplitude of the push-pull signal is defined using an equation of (P1−P2) / (P1 + P2) as an asymmetry standard. When an attempt is made to define a boundary region using this equation, the amplitudes of P3 and P4 are symmetrical as shown in FIG. 15, and when the amplitude is extremely small, (P1-P2)
The expression / (P1 + P2) is satisfied, but the tracking servo may become unstable. On the contrary, as shown in FIG. 15, even when the amplitudes of P3 and P4 are symmetric and the amplitude is small within a stable tracking servo range, the value of (P1−P2) / (P1 + P2) is not satisfactory. It becomes a disk and becomes a factor which worsens the manufacturing margin of a disk. Therefore, it is most preferable for this type of disk to introduce this new formula to define this area.

By adopting such a format, the recording operation (Write Mode) of FIG.
The read operation (Read Mode) is performed as shown on the left side of FIG. 5. When it is determined that the disc is of this type, the write operation is first executed as “bo”.
linking loss area of the last ECC block of unary zone1
Let a be the recording so far. However, as mentioned above, this linki
The area in the vicinity of ng loss area is a 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. Recording control can be performed stably by changing the gain and offset control value during control. Further, the control value may be changed according to the result of learning by measuring the offset level of the tracking error signal in this region in advance. Next, switching to the playback mode (reading), playing the control data area, playing the wobble signal from the unreadable emboss with LPP area, generating the clock for recording, generating the address signal from the LPP, and generating the recording timing Generating (reading gen wclk), then buf
Recording is resumed from the fer zone. This control data area and unreadable emboss with LPP area is also a boundary area, and 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 other tracks. Because there is sex
Only when reproducing this area, the recording control can be stably performed by changing the gain and the offset control value at the time of tracking control. Further, the control value may be changed according to the result of learning by measuring the offset level of the tracking error signal in this region in advance. Next, when the playback operation (Read Mode) in FIG. 5 is determined to be a disc of this type, when the control data area is first played back,
It is a normal method to move to the vicinity of the linking loss area of the last ECC block of zone 1 and reproduce the first area of the control data area. In this case, as described above, the area near the linking loss area Is a boundary area, and if 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. By changing the value, the recording can be performed stably. Further, the control value may be changed according to the result of learning by measuring the offset level of the tracking error signal in this region in advance. Since this area is recorded with information that has no meaning such as 0 data as information, even if the reproduced data has an error, it may be skipped. The control data area is reproduced, and necessary lead-in information and information relating to copy protection are acquired. Then, the control data area is moved to the data area, and content reproduction processing is performed.

The manufacturing method, configuration, and name used here are examples, and the present invention is not limited to the manufacturing method, correction format, disk structure, and the like in this example.

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

Claims (10)

A first intermediate area having a plurality of spiral information tracks, and information is formed as a first emboss on the track in the land area, and reproduced from the information track following the first intermediate area A first read-only area in which control data is formed as a first emboss to manage user information to be
A second read-only area in which information is formed on a track in the land area as a second emboss different from the first emboss;
An information track area where user information is recorded, and
A second intermediate area between the first reproduction-only area and the second reproduction-only area for continuously connecting tracks of the first reproduction-only area and the second reproduction-only area And
The tracking error signal at the time of tracking off of the second intermediate area between the first reproduction-only area and the second reproduction-only area is the tracking error signal at the time of tracking off of the information track area where the user information is recorded. An information recording medium characterized by being defined as a ratio of the maximum amplitude in both directions from the center of the maximum amplitude of the tracking error signal.   2. The information recording medium reproducing method for reproducing the information recording medium according to claim 1, wherein the user information recorded on the information track is reproduced based on the reproduction of the control data. Method.   2. The information recording medium reproducing apparatus for reproducing the information recording medium according to claim 1, wherein the user information recorded on the information track is reproduced based on the reproduction of the control data. apparatus.   2. The information recording medium recording method for recording information on the information recording medium according to claim 1, wherein user information is recorded on the information track based on reproduction of the control data. .   2. The information recording medium recording apparatus for recording information on the information recording medium according to claim 1, wherein user information is recorded on the information track based on reproduction of the control data. . A first intermediate area having a plurality of spiral information tracks, and information is formed as a first emboss on the track in the land area, and reproduced from the information track following the first intermediate area A first read-only area in which control data is formed as a first emboss to manage user information to be
A second read-only area in which information is formed on a track in the land area as a second emboss different from the first emboss;
An information track area where user information is recorded, and
A second intermediate area between the first reproduction-only area and the second reproduction-only area for continuously connecting tracks of the first reproduction-only area and the second reproduction-only area And
The push-pull tracking error signal at the time of tracking off of the second intermediate area between the first read-only area and the second read-only area indicates that the information track area in which the user information is recorded is tracked off. An information recording medium characterized in that a predetermined value can be secured in both directions from the center level of the push-pull tracking error signal with respect to the maximum amplitude of the push-pull tracking error signal at that time.    7. The information recording medium reproducing method for reproducing the information recording medium according to claim 6, wherein the user information recorded on the information track is reproduced based on the reproduction of the control data. Method.    7. The information recording medium reproducing apparatus for reproducing the information recording medium according to claim 6, wherein the user information recorded on the information track is reproduced based on the reproduction of the control data. apparatus.    7. The information recording medium recording method for recording information on the information recording medium according to claim 6, wherein user information is recorded on the information track based on reproduction of the control data. .   7. An information recording medium recording apparatus for recording information on the information recording medium according to claim 6, wherein user information is recorded on the information track based on reproduction of the control data. .

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