JP4613972B2 - Information recording medium recording method, information recording medium reproducing method, information recording medium recording apparatus, and information recording medium reproducing 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). hereinafter referred to as "LPP") are formed as, for example, a method of recording recording information recording medium such as a DVD-RW, a method of reproducing the information recording medium, a recording apparatus of the information recording medium, and information recording medium The present invention relates to a reproducing apparatus .

  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 order to solve the above-described problems, the present invention provides: (1) an information recordable area formed of a spiral information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track; The information recordable area includes a control data area in which data is recorded as an emboss and a frequency signal is recorded in advance, and a reproduction-only area in which an information signal is recorded as an emboss and a frequency signal and an address signal are recorded in advance. boundaries and, push-pull tracking error signal when the boundary of the tracking-off between the control data area and the reproduction only area between the control data area and a push-pull during the tracking off of the information recording area Tracking the boundary when the maximum amplitude of the tracking error signal is A Each B1 and B2 of the maximum amplitude from the center of both the maximum amplitude of the push-pull tracking error signal at the time of off is formed so as to satisfy a relation of B1> 0.2 × A and B2> 0.2 × A An information recording medium recording method for recording information on the information recording medium, wherein the information is recorded before an linking loss area located on the inner circumference side of the control data area based on an address signal of the information recordable area. After recording to the front of the linking loss area, the step of switching to the playback mode and the information recordable area following the playback-only area based on the address signal of the playback-only area are specified, and the recording is started from the playback mode. Switching to a mode and starting recording in an information recordable area following the read-only area. To provide a recording method of the recording medium.
In order to solve the above problems, the present invention provides (2) an information recording medium reproducing method for reproducing an information recording medium recorded by the information recording medium recording method described in (1) above, wherein the control Provided is a method for reproducing an information recording medium, wherein information recorded in the information recordable area is reproduced based on information in a data area.
In order to solve the above-described problems, the present invention provides: (3) an information recordable area formed of a spiral information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track; The control data area is recorded as embossed and the frequency signal is recorded in advance, and the information recording is recorded as embossed and the read-only area in which the frequency signal and the address signal are recorded in advance. The push-pull tracking error signal at the time of tracking off of the boundary between the recordable area and the control data area and the boundary between the control data area and the read-only area When the maximum amplitude of the push-pull tracking error signal is A, the boundary track The push-pull tracking from the maximum amplitude center of the error signal and the respective B1 of maximum amplitude of both B2 during Nguofu is formed so as to satisfy a relation of B1> 0.2 × A and B2> 0.2 × A An information recording medium recording apparatus for recording information on a recorded information recording medium, before a linking loss area located on an inner circumference side in the control data area based on an address signal of the information recordable area at the time of recording After recording to the front of the linking loss area, the playback means for switching to the playback mode, and the information recordable area that follows the playback-only area based on the address signal of the playback-only area, And recording means for switching to a recording mode and starting recording in an information recordable area following the read-only area. To provide a recording apparatus of the information recording medium.
In order to solve the above-described problems, the present invention provides (4) an information recording medium reproducing apparatus for reproducing an information recording medium recorded by the information recording medium recording apparatus described in (3), wherein the control There is provided a reproducing apparatus for an information recording medium, wherein information recorded in the information recordable area is reproduced based on information in a data area.

  According to the present invention, by providing an intermediate area between the read-only area and the recording area or between the read-only area and the read-only area, the recording / playback signal characteristics are improved and the tracking error signal is excessive. Therefore, there is an advantage that a problem such as a decrease in trackability at the time of recording does not occur due to generation of an offset signal or a missing tracking error signal. In addition, even if the discs are of different types, there is an advantage that recording or reproduction can be performed without any problem.

    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 embossed pits when the disc master is cut, and a disc substrate is formed by using a metal matrix created by the disc master, whereby the disc of the recordable optical disc described above is used. 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 resist board is mounted at a predetermined position of the cutting device, the previously recorded information, address information, and frequency information are respectively obtained by irradiating the resist board with intermittent light or a laser beam for cutting that is slightly vibrated in the radial direction. Is recorded at a specific position.

  Here, two cutting laser beams are used, one of the cutting laser beams is used as continuous light to form a guide groove, and the other is intermittently formed to form an LPP. The recorded information 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 covered with a conductive thin film, and the 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 guide groove depth is set so that a recording / reproducing operation can be efficiently performed on a DVD-RAM disc that is a recordable optical disc, and it is convenient for reproduction on a DVD-ROM disc that is a reproduction-only disc. The pit depth is set.

  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 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 land prepits.

  (2) Next, as a second method, when cutting the resist board as shown in FIG. 8, a cutting laser beam (laser A) for forming pits and guide grooves, and a land pre-pit. This is a method using another cutting laser beam (laser B) for forming the film. 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, so that the recording / reproducing signal characteristics similar to those of a disk formed with only a conventional guide groove can be obtained. 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) The resist height is different, so the pit signal and the land pre-pit signal are missing from the pit row-pit row to the guide groove and from the guide groove to the pit row-pit row. Or a difference in amplitude, a difference in tracking signal amplitude such as a push-pull method, or an occurrence of an 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.

  As described above, in order to record information that cannot be rewritten and can be recorded in a pit row by recording / reproducing in a guide groove and recording information in a guide groove, a groove in the guide groove is used. The depth 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 have excellent recording and reproduction characteristics. Furthermore, there has been a demand for a disc that 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 that does not disturb the tracking signal in some manner.

  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, it is possible to always obtain optimum tracking characteristics even in a 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. 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 view for explaining a second embodiment of the information recording medium of the present invention. FIG. 7 is a cross-sectional view, FIG. 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, as an embodiment of the information recording medium of the present invention, DVD-RW is used and information is recorded on this DVD-RW. However, other recordable CD-RWs are described. Needless to say, the present invention can also be applied to high-density optical disks such as DVD + RW and next-generation DVD.

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, the recording information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. In one data sector 20, from the head, ID information 21 indicating the start position of the data sector 20, an ID information error correction code (IED) 22 for correcting an error of the ID information 21, It is composed of preliminary data (for example, CPM) 23, a data area 24 for storing main data to be recorded, and an error detection code (EDC) 25 for detecting an error in the data area 24. Recording information to be recorded is constituted by being continuous.

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

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

  Next, with the correction blocks 34 of the 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.

  Through the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. 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 indicated by “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, 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 in the horizontal (horizontal) direction in FIG. This is because the correction of the data in the ECC is performed by the intra-ECC code 31 and the correction of 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 all of one column is destroyed by a DVD-RW scratch or the like with 6 bytes or more, the code 31 in the ECC It 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.

  As shown in FIGS. 3B and 3C, one recording sector 40 is divided into data 41 for every 91 bytes, 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 horizontal row is composed of 13 rows including 172 bytes of data, 10 bytes of PI and 4 bytes of sync, 186 bytes, and 12 rows of vertical columns plus one row of PO. 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 read-only area (area P2) or between the read-only area (area P1) and the recording / playback 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 (glass master side) and the bottom surface of the intermediate region pit row PM (glass master side) are on the same plane.

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

  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, and the pit shape is not lost or lost. 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 FIG. 6, the guide groove 1 having a bottom surface on the surface of the glass master on the resist board R has a laser beam intensity (PA1) suitable for recording the guide groove using a laser (beam) A. To be recorded. At this time, the bottom surface of the guide groove 1 is exposed to the surface of the glass master. The 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 and focuses the light on the resist board. For example, a device for increasing the spot of (beam) B may be included, for example, a device for exposing one track width. At this time, the laser (beam) B may be slightly wobbled at a predetermined frequency.

  Next, as shown in FIG. 1, following the formation of the guide groove 1 in the recording / reproducing area (area 1), the guide groove 2 in the pit area pit row PB) in the area P2 is guided using the laser (beam) A. 2 is exposed at a laser beam intensity (PA3) suitable for recording 2. 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, the same resist thickness as that of the guide groove 1 (region 1) remains on the side of the guide groove portion (between the guide groove and the land) using the laser (beam) B, and the resist thickness is sequentially increased. The guide groove 1 adjacent to the pit row PB (region P2) is the same as the pit row PB (region P2) with the laser light intensity (PB3) so that the resist having the necessary thickness remains in the pit row PB (region P2). It is formed with a laser beam intensity that reaches the resist thickness. 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, the identification information indicating that it is a recordable optical disc is suitable for recording pits and exposing all the resist thickness directions in the region P1 having the pit row PA using the laser (beam) A. It is recorded with the laser light intensity (PA2) 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, and 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. 1, the intermediate region is a pit region (pit row PM), and region P1 (pit row PA) and region P2 In FIG. 6, the intermediate region is formed as a pit region (pit row PM) between the region P1 (pit row PA) and the recordable region 1 in FIG. Different.

  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. The type (type) 1 shown in FIG. 5 is continuous from the track in the right reproduction-only pit P area to the left recordable groove G (groove) area on the disc described later using the comparative example in FIG. It shows the state that has been switched to. 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 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 LPP having information such as addresses are provided in the land area on the outer peripheral side of the wobble and the groove area having a depth of about λ / 12 from the inner circumference which is the recordable / reproducible area. Initial zone, system reserved zone, buffer zone 0, RW-physical format information zone, reference code zone, reference code zone, which is a recordable / reproducible area where a differential push-pull tracking error signal can be obtained. -2) A DPD tracking error signal composed of prepits having a depth of about λ / 4 and wobbles but no land prepits LPP is obtained and recorded. Control data zone (Readable emboss without LPP), which is a read-only area where signals can be read and has information on copyright protection and lead-in information. (1-3) Wobble and land preamp Unreadable emboss zone with LPP, which is a read-only area in which a DPD tracking error signal composed of pre-pits having pits LPP is obtained and a recording / playback 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. It is divided in the outer peripheral direction in the order of buffer zone 2 and the following data area for recording 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. The recording zone is a recordable / reproducible area having a land pre-pit LPP having the following information: Initial zone, system reserved zone, buffer zone 0, RW-physical format information zone from which a differential push-pull tracking error signal can be obtained. Reference code zone, (2-2) boundary flag zone 1 in which a code for determining whether it is type 1 or type 2 is recorded (which may not be present), and which is an intermediate area described above dary emboss zone 1 (a pit area formed to have a depth of about λ / 12 to a depth of about λ / 12, which has a wobble and a differential push-pull tracking error signal and a DPD tracking error signal. (2-3) A read-only area in which a DPD tracking error signal consisting of prepits having a depth of about λ / 4 but having no wobbles but no land prepits LPP is obtained and recording signals can be read out A control data zone (Readable emboss with LPP) having information on copyright protection and lead-in information, (2-4) a boundary in which a code for determining whether it is a type (type) 1 or a type (type) 2 is recorded flag one2 (may be omitted), a boundary emboss zone2 having a structure opposite to the intermediate region described above (pits formed to have a depth of about λ / 4 to a depth of about λ / 12) (2-5) From a depth of about λ / 12, a wobble and an LPP are recorded (a differential push-pull tracking error signal and a DPD tracking error signal can be obtained). 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 is obtained, and recording signals cannot be read, (2-6) wobbles and about λ / 12 The land area on the outer peripheral side of the groove area of a depth of The record zone is a recordable / reproducible area having a land pre-pit LPP having information such as “less”, and the outer zone in the order of buffer zone 2 from which a push-pull tracking error signal is obtained and data area for recording the user's content. It is divided. 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) 2 is shown by Write Mode on the right side of FIG. 5, and the operation at the time of reproduction is shown by Read Mode on the right 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.

  Boundary flag zone 1 and boundary flag zone 2 do not have to be in this position, but boundary zone 1 and boundary flag zone 2 change the recording / reproducing method according to type (type) 1 or type (type) 2 of the disc. Control data zone with in-information and LPP address information in the recordable area are embedded and recorded in advance so that the type (type) 1 or type (type) 2 of the disc to be recorded / reproduced can be determined. Keep it.

  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. Initial zone, system reserved zone, buffer zone 0, RW-physical format information zone, reference code zone, buffer zone 1, and linked loss area. 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. This is the control data zone (Readable emboss without LPP) of the area.
Each track number 5, track number 6, and track number 7 has a depth of about λ / 12 and a DPD tracking error signal composed of pre-pits having land pre-pits LPP is obtained, and the recording signal cannot be read out. Unreadable emboss zone with LPP which is a reproduction-only area.
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. The recording zone is a recordable / reproducible area having a land pre-pit LPP with the following information: Initial zone, system reserved zone, buffer zone 0, RW-physical format information zone from which a differential push-pull tracking error signal can be obtained. Reference code zone.
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. Control data zone (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 emboss 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, it is necessary to determine type (type) 1 or type (type) 2. As a detection method of type (type) 1 or type (type) 2, the control data zone having the lead-in information is reproduced at the time when the disk is inserted and the startup process is performed, 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. In another example of this embodiment, type (type) 1 or type (type) 2 is recorded as LPP in boundary flag zone 1 and boundary flag zone 2, so that this value can be determined by reading this value during recording. Can do. 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 (Write Mode shown on the left side of FIG. 5), each track of track number 1, track number 2, track number 8, track number 9 is recorded. As described above, there are frequency signals that are wobbled on both sides of the track in all areas, and this frequency signal is detected and the speed signal for rotating the disk is fed back to make the disk linear velocity A constant control is performed and a recording clock signal is generated. Next, the LPP recorded in 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 (recording in Write Mode shown on the left side of FIG. 5). (Initial zone to Linking loss area) is started. Then, recording is stopped at the linking timing corresponding to the track corresponding to the track of track number 3, and the reproduction state is set (reading in Write Mode shown on the left side of FIG. 5).

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 pit, and a reproduction operation is performed based on the address (Write Mode shown on the left side of FIG. 5). Reading, control data zone (Readable emboss with 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, the recording clock and the recording timing are generated (reading gen wclk, Unreadable emboss with LPP in the Write Mode shown on the left side of FIG. 5), and the linking timing is similarly applied to the tracks of the track numbers after the track number 8. Then, the recording is started, and the subsequent recording process is performed (recording, buffer zone 2 to data area in the write mode shown on the left side of FIG. 5).
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 at the time of reproduction, and the processing at the time of reproduction (Read Mode shown on the left side of FIG. 5) is a tracking error. Are sequentially reproduced from the track number 1 to the track number 9 (reading, initial zone to control data zone (read mode shown in the left side of FIG. 5). Readable emboss with LPP)). At that time, since the signals of track number 5, track number 6, and track number 7 cannot be reproduced, they are skipped (see read, unreadable emboss with LPP to buffer zone 2 in the Read Mode shown on the left side of FIG. 5), and then the track Tracks with track numbers after number 8 are continuously reproduced (reading, Data area in Read Mode shown on the left side of FIG. 5).

  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 because the track of track number 2 has both tracks. 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 and 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 perform by the track | truck of the track number after the track number 6.

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

  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 of track number 2 is skipped because the recording area cannot be reproduced or is composed of reproducible pits (recording wavy line portion in write mode shown in the right side of FIG. 5, 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). Reading in Write Mode shown on the right side, Control data zone (Readable emboss without LPP) to 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, the track number 5, track number 6, and track number 7 are signals in which the 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, the recording clock and the recording timing are generated (reading gen wclk and Unreadable emboss with LPP in the Write Mode shown on the right side of FIG. 5), and the linking timing is similarly applied to the tracks of the track numbers after the track number 8. Then, the recording is started and the subsequent recording processing is performed (recording in write mode, buffer zone 2 to data area shown on the right side of FIG. 5).

  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 areas are arranged in this manner, the boundary of the pit area can be recorded continuously, so that an RF signal can be obtained continuously during reproduction, and processing during reproduction (Read Mode shown on the right side of FIG. 5). Uses a phase difference method (DPD) (which may be a differential push-pull) as a tracking error, and sequentially reproduces tracks from track number 1 to track number 9. At this time, in type (type) 2, the signals of track number 2, track number 5, track number 6, and track number 7 cannot be reproduced, so skip reading (see seek and initial in Read Mode shown on the right side of FIG. 5). zone-boundary emboss zone 1, boundary flag zone 2-buffer zone 2), and then continuously playing the respective tracks of track number 3, track number 4, and track numbers after track number 8 (right side of FIG. 5) (Reading, Control data zone (Readable emboss without LPP) to boundary flag zone 2, Data area) .

  Also, if type (type) 1 and type (type) 2 cannot be detected and type (type) 1 is detected, or if type (type) 2 is mistakenly detected as type (type) 1 However, this plan is effective. That is, in this 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, it is impossible to detect LPP accurately even if the wobble signal can be detected. As a result, recording is interrupted. Alternatively, the recording process is performed while the LPP signal is complemented by the signal processing circuit. Even if all tracks with track number 2 have been recorded, a tracking error signal can be obtained from this area during playback of this track, so that the playback signal cannot be read from the track with track number 2. And continuous playback is possible. 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. The buffer zone 1 of type (type) 2 shown in FIG. 5 is different from that shown in FIG. 10 in that it is unreadable emboss with LPP boundary 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. Since this operation is the same as type (type) 2 except for unreadable emboss with LPP boundary flag 1, the description of the overlapping operation is omitted, but the description of the operation different from type (type) 2 is as follows. is there. The area of unreadable emboss with LPP boundary flag 1 is the same as the unreadable emboss with LPP area, and the difference is that boundary flag 1 is written in the LPP in this area. In FIG. 10, since the area to be recorded in the buffer zone 1 is an unreadable emboss area, the recording is terminated in the previous reference code zone and switched to the reproduction operation. 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 types of the boundary emboss zone 1 and the boundary emboss zone 2 of the type (type) 2 shown in FIG. 5, and the type (type) 1 and type shown in FIG. (Type) 2 are arranged at the same address position. Boundary emboss zone 1 and boundary emboss zone 2 are areas composed of embossed pits as shown in the comparison table shown on the right side of FIG. 11, and in type (type) 4, wobble and LPP Is recorded, but in type (type) 5, the wobble is recorded, but the LPP does not have to 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) and the reproducing operation (Read Mode) in FIG. 11 are recorded until the recording loss area is recorded as shown in the left side of FIG. ), Switching to the reproduction mode (reading), reproducing the wobble signal from the unreadable emboss with LPP area, generating a clock for recording, generating an address signal from the LPP, and generating a recording timing (reading gen wclk) Next, recording is resumed 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. However, in push-pull, it is difficult to pass through the boundary emboss zone 1 and the boundary emboss zone 2 in succession, so that the identification information of type 4 (type) 4 or type 5 (type) 5 can be read by LPP or control data zone, etc. By recording in advance in the read-only area, it is possible to cope with each disc.

  When the disk type (type) described in each of the above embodiments is classified, type (type) 1 and type (type) 4 are in the same group. In the following description, this is referred to as type (type) 1. I will explain as a representative. Since type (type) 2, type (type) 3, and type (type) 5 are in the same group, in the following description, type (type) 2 will be described 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. This can be performed continuously without interruption, and the added value of the DVD-RW can be increased without affecting the DVD-ROM and DVD video playback apparatus that have been put on the market.

  In the above-described embodiment, a boundary emboss zone 1 and a boundary emboss zone 2 including a pit area of one track as an intermediate area are provided between the reproduction-only area and the recording area or between the reproduction-only area and the reproduction-only area. Of course, it may be an area of two or more tracks. As can be seen in FIG. 5, the difference between type (type) 1 and type (type) 2 is negligible, and boundary emboss zone 1, which is the boundary area between the recording area and the reproduction-only area, the first reproduction-only area, and the second reproduction-only area. Boundary emboss zone 2 that is the boundary area of the read-only area is defined as a boundary area that does not need to be recorded if the address cannot be accurately detected, or an area where the playback signal may not be accurately read. , Type (type) 1 and type (type) 2 can have 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. Type (type) 6 and type (type) 7 shown in FIG. 12 are defined as boundary zone 1 of type 4 (type) 4 shown in FIG. 11 as boundary zone 1, and in type (type) 6, this area is a wobble and LPP. Is a recorded recordable groove area, and in type (type) 7, this area is an embossed pit area where a wobble is recorded but LPP is not recorded, and a boundary emboss zone 2 is shown in FIG. The wobble and LPP similar to the boundary emboss zones 1 and 2 are recorded embossed pit areas. In the case of type 7, even if the LPP is recorded, the LPP may not be accurately read. Identification information indicating type (type) 6 or type (type) 7 is recorded in advance in a reproduction-only area such as LPP or readable control 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. Therefore, 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 generated. It is possible to record by supplementing with a circuit. Actually, in the case of recording of boundary zone 1, in the case of type 6, as described in the table, the latter half of the two ECC blocks are recorded as Linking Loss Area, so far, in the case of type 7, The first ECC 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.

  As is common to all the embodiments, the boundary emboss zone 1 or the boundary zone 1 is formed as a pit of an intermediate area of a circular disk, but the 2 ECC blocks arranged as the intermediate area are , It is a little larger area than its lap. 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) and the reproducing operation (Read Mode) in FIG. 12 are omitted from the description of the same processing as in the above embodiment, as shown on the left side of FIG. The type 6 or 7 information recorded in the LPP or control data area is acquired. In the case of type 6, the recording operation (Write mode) is the last ECC block of boundary zone 1 and is linked so far. recording), switching to the reproduction mode (reading), reproducing a wobble signal from the unreadable emboss with LPP area, generating a clock for recording, generating an address signal from the LPP, and generating a recording timing (ready) g gen wclk), then resumed again recording (Recording) from buffer zone. In the case of type 7, the recording operation (Write mode) sets the last ECC block before the boundary zone 1 as a linking loss area, records it up to this point, switches to the playback mode (reading), and switches from the unreadable emboss with LPP area. The wobble signal is reproduced, a clock for recording is generated, an address signal is generated from the LPP, a recording timing is generated (reading gen wclk), and then recording (recording) is restarted from the buffer zone. Also, if a type 7 medium is recorded by the type 6 method assuming that the type 6 or 7 information recorded in the LPP or control data area is not acquired, the wobble signal is continuous. Therefore, continuous recording can be performed on the basis of 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. In the above description of the present invention, FIG. 13 shows that the bottom surface is configured with the same depth (position), whereas the sixth embodiment uses a guide groove with a different bottom surface in FIG. In the intermediate area, the pit row area and the bottom surface of the guide groove region gradually become shallower with a predetermined inclination as it goes from the guide groove direction to the pit row direction. Again, the bottom surface in the pit row is the same as the bottom of the guide groove. It is configured to be a surface. 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 was set to have a laser beam intensity (PB3) at which a desired land pre-pit was formed, and the depth of the land pre-pit to be cut was set to about 30 nm. 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.

  As described in the above embodiment, the track of the recordable intermediate area having the tilt of the disk manufactured by the method is slightly offset even in the push-pull method and the differential push-pull method as the tracking method. Although it may occur, 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 (DPD) method can be used for stable tracking with almost no offset. 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 (type) 6 shown in FIG. 14 is substantially the same as the type (type) 6 shown in FIG. 12, and the type (type) 8 shown in FIG. 14 is the type (type) shown in FIG. In the boundary zone 1 of FIG. 7, this area is an embossed pit area where wobbles are recorded but LPP is not recorded, whereas in type (type) 8, the wobble is inclined as described above. The LPP is a recordable groove area in which LPP is recorded, and the LPP in this area is an area where the LPP may not be read accurately even if it is arranged. Boundary emboss zone 2 is a wobble and LPP similar to Boundary emboss zone 2 shown in FIG. 12, and an embossed pit area is recorded. In the case of type 8, an area where LPP may be recorded but LPP may not be read accurately. It is. Identification information indicating that it is type 6 or type 8 is recorded in advance in a reproduction-only area such as LPP or readable control data zone. For example, the identification information can be defined as 0: no boundary 1: boundary present in Media type 3 (media type) of Disc Physical code of LPP information.

  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, in both cases of type 6 and type 8, the 2F1F0h ECC 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) 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) and the reproduction operation (Read Mode) in FIG. 14 are omitted from the description of the same processing as in the above embodiment, as shown on the left side of FIG. The type 6 or 8 information recorded in the LPP or control data area is acquired. In the case of types 6 and 8, the recording mode (Write mode) is the linking loss area of the last ECC block of boundary zone 1, and so far Recording (recording), switching to the reproduction mode (reading), reproducing a wobble signal from the unreadable emboss with LPP area, generating a clock for recording, generating an address signal from the LPP, and generating a recording timing (rea) ing gen wclk), then resumed again recording (Recording) from buffer zone. Further, when the type 8 is recorded in the boundary zone 1 and the push-pull method is used as the tracking error, an offset signal in an allowable range is generated in the tracking error signal, and only when this area is recorded beforehand. By measuring the offset value in advance and performing control so as to cancel the offset in accordance with this value, recording can be performed more accurately. 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. 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, but similarly, the boundary zone 1 is configured to gradually change the depth. Also good.

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 a recordable groove area in which the boundary zone 1 is inclined as described above and the wobble and the LPP are recorded. Then, since it is the same region as type 1 buffer zone 1, it can be defined as buffer zone 1. Similarly, the boundary emboss zone 2 shown in FIG. 14 is the same as the unreadable emboss with LPP area because the wobble and LPP are the embossed pit areas recorded, and can therefore be defined as the unreadable emboss with LPP area. it can.

  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 the 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. 5 is set to the peak value P1 in the upward direction and the peak value P2 in the downward direction on the basis of the center voltage, and based on the center voltage in the area near the boundary. When the peak value P3 in the upward direction and the peak value P4 in the downward direction are set,
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. The value of 0.2 is preferably in the range of about 0.15 to 0.3 because there are factors that vary depending on the measurement method.
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 the boundary region is to be defined using this equation, the amplitudes of P3 and P4 are symmetric as shown in FIG. 15, and when the amplitude is extremely small, (P1-P2) / ( Although the expression (P1 + P2) is satisfied, 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, it cannot be satisfied depending on the value of (P1−P2) / (P1 + P2). 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.

  With such a format, the recording operation (Write Mode) and the reproducing operation (Read Mode) in FIG. 5 are performed as shown on the left side of FIG. In the recording operation (Write mode), first, the linking loss area of the last ECC block of the boundary zone 1 is set, and recording is performed up to this point. However, as described above, the area in the vicinity of this linking 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 other tracks. Only when the area is recorded, the recording control can be stably performed by changing the gain and the offset control value in the 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, 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 It is generated (reading gen wclk), and then recording is resumed from the buffer 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. Therefore, recording control can be stably performed by changing the gain and offset control value during tracking control only when reproducing this area. 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 played back first, in the vicinity of the linking loss area of the last ECC block of boundary zone 1 It is a normal method to move to and reproduce the first area of the control data area. In this case, as described above, the area in the vicinity of the linking loss area is a boundary area, and the amplitude of the tracking error signal Is small, the offset level of the tracking error signal may be different from that of other tracks, so recording control can be performed stably by changing the gain and offset control value during tracking control only when reproducing this area. You can pass by doing. 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.

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 | region 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.

Explanation of symbols

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

Claims (4)

An information recordable area formed of a spiral information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and control data in which the control data is recorded as emboss and the frequency signal is recorded in advance And a read-only area in which an information signal is recorded as an emboss and a frequency signal and an address signal are recorded in advance, a boundary between the information recordable area and the control data area, and the control data area The push-pull tracking error signal at the time of tracking off of the boundary between the read-only area and the read-only area has the boundary tracking when the maximum amplitude of the push-pull tracking error signal at the time of tracking off of the information recordable area is A. the push-pull tracking error signal in the oFF Maximum from the amplitude center of the respective B1 of both the maximum amplitude B2 is, B1> 0.2 × recording information formed on the information recording medium so as to satisfy the relationship of A and B2> 0.2 × A of A recording method for an information recording medium,
At the time of recording, recording is performed up to the linking loss area located on the inner circumference side in the control data area based on the address signal of the information recordable area, and recording is performed up to the linking loss area before switching to the reproduction mode. Steps,
Identifying an information recordable area following the read-only area based on an address signal of the read-only area, switching from the reproduction mode to the recording mode, and starting recording in the information recordable area following the reproduction-only area; A method for recording an information recording medium, comprising: An information recording medium reproducing method for reproducing an information recording medium recorded by the information recording medium recording method according to claim 1,
A method for reproducing an information recording medium, wherein information recorded in the information recordable area is reproduced based on information in the control data area. An information recordable area formed of a spiral information track, in which a frequency signal and an address signal are recorded in advance from the inner periphery of the information track, and control data in which the control data is recorded as emboss and the frequency signal is recorded in advance And a read-only area in which an information signal is recorded as an emboss and a frequency signal and an address signal are recorded in advance, a boundary between the information recordable area and the control data area, and the control data area The push-pull tracking error signal at the time of tracking off of the boundary between the read-only area and the read-only area has the boundary tracking when the maximum amplitude of the push-pull tracking error signal at the time of tracking off of the information recordable area is A. the push-pull tracking error signal in the oFF Maximum from the amplitude center with each B1 in both directions of the maximum amplitude B2 is, B1> 0.2 × recording information formed on the information recording medium so as to satisfy the relationship of A and B2> 0.2 × A of An information recording medium recording apparatus comprising:
At the time of recording, recording is performed up to the linking loss area located on the inner circumference side in the control data area based on the address signal of the information recordable area, and recording is performed up to the linking loss area before switching to the reproduction mode. Reproduction means;
Recording means for specifying an information recordable area following the reproduction-only area based on an address signal of the reproduction-only area, switching from the reproduction mode to the recording mode, and starting recording in the information recordable area following the reproduction-only area A recording apparatus for an information recording medium, comprising: An information recording medium reproducing apparatus for reproducing an information recording medium recorded by the information recording medium recording apparatus according to claim 3,
An information recording medium reproducing apparatus, wherein information recorded in the information recordable area is reproduced based on information in the control data area.

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