JP2005259269A - Optical disk, recording method of optical disk, reproduction method of optical disk, optical disk driving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium in which identification information unique to a disk for preventing illegal copy, to be recorded in an optical disk or the like is recorded in a region in which at least ternary or more reproduction signal levels are obtained and an another detection slice level B is provided between the levels, authenticity of the optical disk can be discriminated depending on existence of detection in the detection slice level B, and its reproduction method. <P>SOLUTION: This is an optical disk in which either or both of a groove and a land are used as a recording track and which is provided with a recording layer in which information can be recorded, at least ternary or more reproduction signal levels are obtained by providing a flat part at specific positions of fixed interval between the recording tracks or a groove part at specific positions of fixed interval between information pit columns. The flat part or the groove part can be detected by only the detection slice level B, an optical disk copied illegally to a recording medium and an optical disk illegally duplicated to a ROM can be distinguished by forming identification information unique to a medium of the optical disk in this region. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc and an optical disc recording / reproducing method, and more particularly to an optical disc on which disc-specific identification information for preventing unauthorized copying is recorded, an information management method thereof, and a drive device.

  Conventionally, in an optical disc, identification information unique to each optical disc is recorded for preventing unauthorized copying. Conventional techniques for recording identification information include methods such as BCA (Burst Cutting Area) recording used in DVDs (Digital Versatile Disks) and the like, and JP-A-9-091781 and JP-A-2002-197670. Are known. (See Patent Documents 1 and 2)

  BCA is a method of recording disc-specific identification information by partially melting a reflective layer of a disc by laser trimming to form a non-reflective portion on a plurality of tracks and arranging the non-reflective portion in a bar code shape. Yes, it is effective for a read-only optical disk such as a CD-ROM or DVD-ROM that has only a reflective layer, but the BCA writer is very expensive, which increases the cost.

  Since information recorded on a write-once optical disc such as a CD-R or DVD-R cannot be rewritten, it is possible to record disc-specific identification information using a recorder, but dead copy on a blank disc Then, the original disc and the copy disc cannot be identified.

JP-A-9-091781 JP 2002-197670 A

  Even when the disc-specific identification information of the recordable optical disc is formed in advance by prepits, there is no characteristic difference in signal level, which is similar to the above. However, since disc-specific information is common at the stamper level, the disc It is necessary that the unique information can be identified from the optical disc formed with pre-pits in advance.

  The present invention has been made in view of the above points, and disc-specific identification information for preventing unauthorized copying, etc., is obtained by cutting the lands on both sides of the recording track groove to make the flat portion wider than the recording track width in the radial direction. And the reproduction signal level of the recording track portion and the identification information portion are made different, the signal of the identification information portion is detected at a signal detection level different from that of the recording track portion, and the identification signal is read out. Accordingly, it is an object of the present invention to provide a reproducing method and a medium structure therefor that can easily identify an unauthorized copy disc created by a method other than the present invention using a normal drive.

  In addition to the above-described illegal copy prevention, an optical disc recorded with high density reproduces a signal by reflected light, so that a deviation of reflected light due to disc tilt is also a serious problem.

  According to the present invention, there is provided a copyrighted work protection means that is difficult to duplicate without imposing a complicated mechanism on the drive and the optical disk and that allows unauthorized duplication to be easily observed. Its characteristics are as follows. (1) By forming identification information with recording marks across the flat part and the recording track groove, a level difference occurs in the reproduction signal of the recording mark in the flat part and the recording track groove part, and the recording mark recorded in each part By mixing at least three states with different reproduction signal levels and detecting them by providing slice levels corresponding to the respective signal levels, only two values of the recorded state can be obtained on an optical disc that does not have a flat portion. In addition, since the unique identification information area and the recording mark are not completely reproduced, it is possible to see a duplicate. (2) Flat portions wider than the recording tracks formed in the recording track direction are arranged at regular intervals, and medium specific information such as medium type, servo method, etc., and medium-specific information such as serial number and media ID are recorded on the optical disc. By recording with marks, information that has a different playback signal level from the recording marks recorded in the normal recording track groove is recorded, and the slice level for recording is different because the slice level for playback is different. Since it cannot be played back, illegal duplication becomes difficult. In this way, it is also possible to discriminate even when legitimate disc unique identification information is illegally copied to a recording track of an optical disc on which disc unique identification information is not recorded.

  In order to achieve the above-described object, an object of the present invention is to record disc-specific identification information that makes it easy to determine the authenticity of an optical disc that uses a groove as a recording track and has a recording layer capable of recording information. A track structure is provided, wherein a flat portion wider than a track width is formed by cutting a part of a land on both sides of a recording track of an information recording region in a track direction, and the recording track including the flat region is irreversible. Disc-specific identification information is formed with a typical recording mark, and in the track-on state in which the recording track on which the disc-unique identification information is recorded is tracked, the unique identification information is reproduced, and a normal recording track groove is formed. The regular disc can be easily identified by the slice level provided between the signal level of the recorded recording mark and the playback signal level of the recording mark on the flat part. Characterized in that it. In the coating type dye recording medium, since the film thickness of the recording track groove portion is thicker than that of the flat portion, the signal amplitude level is higher in the normal recording track groove portion than in the flat portion, but conversely, the reproduction level of the unrecorded flat portion is It becomes higher than the reproduction level of the recording track groove. For this reason, in a disc that does not have a flat portion in the recording track, a signal that can be detected at the slice level for detecting the unrecorded flat portion does not appear, or the detected slice level of the recording mark recorded in the normal recording track groove portion Can not be detected by detecting the presence or absence of this signal. Further, a drive capable of demodulating data from a signal recorded in the flat part or a data block continuous to the flat part, obtaining security information, and accessing a recording information area, with the detection of this signal as a trigger By using the system, it becomes easy to distinguish the disc from unauthorized duplication. The amount of data required for disc-specific identification information recorded on the flat portion is several bytes to several tens of bytes. The length in the track direction of the groove-cutting flat area required for this purpose is several micrometers to several tens of micrometers. Since it is in the range of about a meter, even if the lands on both sides of the recording track groove are cut in the track direction, tracking does not come off. As described above, since the data capacity of the unique identification information is about several tens of bytes at the maximum, it is sufficient to provide several places with an appropriate interval around the track, but the unique identification information is divided into several bytes. The same information may be duplicated on several tracks.

  FIG. 1 shows the relationship between a track direction substrate cross section and a reproduction signal when management information including medium-specific information is constituted by grooves and prepits in an information recording area of a coating type dye recording disk. The reproduction signal level of the flat portion where the groove which is the recording track is cut is higher than that of the groove portion, and the reproduction signal level of the portion where the recording mark is formed is lowered, but the interval between the recording marks is the original flat portion level and the groove portion level. Therefore, there are at least three reproduction signal levels: flat part level> groove part level> recording mark part level. Therefore, when the detection slice level B is set between the flat part level and the groove part level, the recording mark recorded on the normal recording track that can be detected at the detection slice level A set between the groove part level and the recording mark part level. Is not detected at the detected slice level B, and only the space portion of the recording mark written on the flat portion is detected. Therefore, the medium management information such as read-only, recordable, and non-recordable information is included in this portion as the position information. By recording together, it is possible to change and set the recording state for each information recording unit such as a corresponding recording frame, sector, and error correction block. Further, by recording the copy management information, it is possible to manage any copy level management that can be copied once, cannot be copied, or can be copied in the optical disk drive. In addition, when the recording information area is preliminarily divided into multi-session format layouts divided in units of the maximum capacity of the lower medium, it is possible to set different management levels that cannot be copied for each session. .

  Even if a part of the land on both sides of the recording track groove is cut at a constant interval or the formation of the recording track groove is interrupted, a flat region is formed, but in the latter case, the depth change, that is, the phase change And the servo may be disturbed, so the former with a smaller phase change is preferable.

  In addition, in a flat portion larger than the diameter of the laser spot used for recording / reproduction, diffraction due to grooves and pits does not occur, so the deviation between the beam returning to the optical detector of the pickup and the center of the optical detector is on the optical disc recording surface. Since this is a tilt, this signal can be fed back and used for tilt correction.

  When a coating type dye material is used for the recording layer, the dye material used for the recording layer can be a dye material suitable for good recording and reproduction by a known general laser, for example, a cyanine dye or a squarylium dye. And organic substances that are altered by light irradiation, such as polymethine dyes such as azulenium dyes, macrocyclic azaanelene dyes such as phthalocyanine dyes, dithiol dyes, porphycene compounds, and annulene compounds. Such materials may be a mixture of one or more of these organic materials.

  Furthermore, when the laser beam used for recording / reproduction has a wavelength in the vicinity of 400 nm, it is desirable to use a porphycene compound or an annulene compound.

The porphycene compound has the following general formula (Formula 1), and R ^{1 to} R ⁴ in the general formula are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a methyl group, or an ethyl group. A linear or branched alkyl group having 1 to 20 carbon atoms such as n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group and n-hexyl group. It is done. X ^{1 to} X ⁸ in the general formula are each independently a hydrogen atom; a halogen atom; a hydroxyl group; a formyl group; a carboxyl group; a cyano group; a nitro group; an amino group; a sulfonic acid group; or a methyl group, an ethyl group, a linear or branched alkyl group having 1 to 20 carbon atoms such as n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group, n-hexyl group; vinyl group 1-20 linear or branched alkenyl groups such as propenyl group, bethenyl group, pentenyl group, hexenyl group; methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, tert-butoxy group , An ethoxycarbonylpropoxy group, a sec-butoxy group, an n-pentyloxy group, an n-hexyloxy group, an n-heptyloxy group, etc. Alkoxy groups; hydroxyalkyl groups having 1 to 20 carbon atoms such as hydroxymethyl group and hydroxyethyl group; benzene ring, naphthalene ring, anthracene ring, thiophene ring, furan ring, pyrrole ring, pyrazole ring, pyridine ring, pyran ring Aromatic ring or heterocyclic ring having 6 to 12 carbon atoms such as carboxyl group such as carboxymethyl group; methoxycarbonyl group, trifluoromethoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, isopropoxycarbonyl group, n- Linear or branched alkoxycarbonyl having 2 to 21 carbon atoms which may be substituted, such as butoxycarbonyl group, tert-butoxycarbonyl group, sec-butoxycarbonyl group, n-pentyloxycarbonyl group, n-hexyloxycarbonyl group, etc. Group; methylcarbonyloxy group, Substituted with tilcarbonyloxy group, n-propylcarbonyloxy group, isopropylcarbonyloxy group, n-butylcarbonyloxy group, sec-butylcarbonyloxy group, tert-butylcarbonyloxy group, n-pentylcarbonyloxy group, etc. A linear or branched alkylcarbonyloxy group having 2 to 21 carbon atoms; methoxycarbonylmethyl group, methoxycarbonylethyl group, ethoxycarbonylmethyl group, ethoxycarbonylethyl group, n-propoxycarbonylethyl group, n-propoxycarbonylpropyl And straight-chain or branched alkoxycarbonylalkyl groups having 3 to 22 carbon atoms such as a group, isopropoxycarbonylmethyl group, isopropoxycarbonylethyl group and the like. Further, adjacent substituents of X ^{1 to} X ⁸ and R ^{1 to} R ⁴ may be bonded to form a ring. In the above general formula, M is two hydrogen atoms, divalent metal such as Ni, Co, Cu, Zn, Pd, Pt, Fe, Mn, Sn, Mg, Rh, TiO, FeCl, VO, Sn (Y ) Trivalent and tetravalent metal derivatives such as ₂ and derivatives such as Si (Y) ₂ and Ge (Y) ₂ (Y is a halogen atom, alkyl group, aryl group, hydroxyl group, alkoxy group, aryloxy group, alkylthio group) And any derivative capable of coordinating with a porphycene-based compound such as arylthio group). Ni, Zn, Co, and Cu are particularly preferable in that they have a maximum absorption at 300 to 500 nm and a large molar extinction coefficient. preferable.
General formula

The annulene-based compound has the following general formula (Formula 2), and as X ^{1 to} X ³ in the general formula, an oxygen atom, a sulfur atom, a selenium atom, and an imino group are exemplified. R ^{1 to} R ⁶ in the above general formula are each independently a hydrogen atom; halogen atom; hydroxyl group; carboxyl group; methoxycarbonyl group, trifluoromethoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, isopropoxy group C2-C21 straight chain which may be substituted such as carbonyl group, n-butoxycarbonyl group, tert-butoxycarbonyl group, sec-butoxycarbonyl group, n-pentyloxycarbonyl group, n-hexyloxycarbonyl group, etc. Or branched alkoxycarbonyl group; or carbon number such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group, n-hexyl group, etc. Examples thereof include 1 to 20 linear or branched alkyl groups. R ^{7 to} R ¹² in the general formula are each independently a hydrogen atom; a halogen atom; a hydroxyl group; a formyl group; a carboxyl group; a cyano group; a nitro group; an amino group; a sulfonic acid group; a linear or branched alkyl group having 1 to 20 carbon atoms such as n-propyl group, isopropyl group, n-butyl group, tert-butyl group, sec-butyl group, n-pentyl group, n-hexyl group; vinyl group 1-20 linear or branched alkenyl groups such as propenyl group, bethenyl group, pentenyl group, hexenyl group; methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, tert-butoxy group , An ethoxycarbonylpropoxy group, a sec-butoxy group, an n-pentyloxy group, an n-hexyloxy group, an n-heptyloxy group, etc. Alkoxy groups; hydroxyalkyl groups having 1 to 20 carbon atoms such as hydroxymethyl group and hydroxyethyl group; benzene ring, naphthalene ring, anthracene ring, thiophene ring, furan ring, pyrrole ring, pyrazole ring, pyridine ring, pyran ring Aromatic ring or heterocyclic ring having 6 to 12 carbon atoms such as carboxyl group such as carboxymethyl group; methoxycarbonyl group, trifluoromethoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, isopropoxycarbonyl group, n- Linear or branched alkoxycarbonyl having 2 to 21 carbon atoms which may be substituted, such as butoxycarbonyl group, tert-butoxycarbonyl group, sec-butoxycarbonyl group, n-pentyloxycarbonyl group, n-hexyloxycarbonyl group, etc. Group; methylcarbonyloxy group, An ethylcarbonyloxy group, n-propylcarbonyloxy group, isopropylcarbonyloxy group, n-butylcarbonyloxy group, sec-butylcarbonyloxy group, tert-butylcarbonyloxy group, n-pentylcarbonyloxy group, etc. A linear or branched alkylcarbonyloxy group having 2 to 21 carbon atoms; methoxycarbonylmethyl group, methoxycarbonylethyl group, ethoxycarbonylmethyl group, ethoxycarbonylethyl group, n-propoxycarbonylethyl group, n-propoxycarbonylpropyl And straight-chain or branched alkoxycarbonylalkyl groups having 3 to 22 carbon atoms such as a group, isopropoxycarbonylmethyl group, isopropoxycarbonylethyl group and the like. Moreover, adjacent substituents among R ^{1 to} R ¹² may be bonded to form a ring.
General formula

  These organic dyes can be formed on the transparent resin substrate by using a coating method such as a casting method, a spin coating method, or a dipping method, directly or via another layer. The coating solvent is not particularly limited as long as it does not attack the substrate. For example, ketone alcohol solvents such as diacetone alcohol and 3-hydroxy-2-butanone, cellosolv solvents such as methyl cellosolve and ethyl cellosolve, hydrocarbon solvents such as n-hexane and n-heptane, tetrafluoropropanol, octa Perfluoroalkyl alcohol solvents such as fluoropentanol and hexafluorobutanol, hydrocarbon solvents such as cyclohexane, methylcyclohexane, ethylcyclohexane, dimethylcyclohexane, n-butylcyclohexane, t-butylcyclohexane, cyclooctane, diisopropyl ether, dioctane Examples include ether solvents such as butyl ether, and hydroxyl ester solvents such as methyl lactate, ethyl lactate, and methyl isobutyrate.

  The film thickness of the recording layer is appropriately selected according to the wavelength, the optical constant of the light reflecting layer, and the material of the light absorbing layer in consideration of the recording sensitivity performance coefficient with respect to the power of recording light such as laser light used for recording. . In addition, in order to form disc-specific identification information with irreversible recording marks on the land track, which is the gist of the present invention, it is necessary to be able to record in the land portion. However, in the recording layer of the dye recording medium formed by the spin coating method, the dye film thickness of the groove portion that is recessed when viewed from the coating surface is increased, and the dye film thickness of the land portion is decreased. Therefore, at least the dye thickness of the land portion needs to be λ / 6n or more with respect to the laser wavelength λ, and for this reason, the solvent for dissolving the dye and the dye so that the film thickness of the recording layer of the land portion meets the above conditions, Alternatively, it is necessary to optimize the shape of the U-shaped groove of the groove formed on the substrate. In addition to this, since it is essential that the recording and reproducing characteristics over the entire recording medium are required to be superior to those in the land portion, the optical constant n of the dye must be 1.8 or more. The depth of the U-shaped recess should be 20 nm to 150 nm, preferably 50 nm to 120 nm.

  The reflective layer can be composed of a metal such as Au, Ag, Cu, Al or an alloy containing these as a main component, but silver or silver is the main component from the viewpoint of wavelength dependency of reflectance and durability. Alloys are preferred. As a film forming method, the film can be formed by vacuum deposition, sputtering, ion plating, or the like. The film thickness of the light reflecting layer is preferably 0.02 μm to 0.5 μm in consideration of the reflectance and the thermal diffusion efficiency.

  As the protective layer formed on the light reflecting layer, it is preferable to use a hard material such as an acrylic ultraviolet curable resin. This is because the protective layer can be prevented from being deformed over time when stored for a long time under high temperature and high humidity. Usually, it is formed by applying a thickness of 1 to 20 μm by spin coating on the light reflecting layer directly or through another layer, and then curing by ultraviolet irradiation. When a dummy substrate is bonded as in the case of DVD, an acrylic ultraviolet curable resin protective layer may be directly bonded between the reflective layer of the substrate provided with the dye recording layer and the reflective layer and the dummy substrate.

  As the recording film material, in addition to the coating type dye, a vapor deposition type dye or a phase change recording film that can be formed by sputtering can be used. In the case of a recording material that can be formed in a vacuum such as a phase change recording film, a heat-resistant dielectric protective film is required on both sides of the recording film, but it depends on the pattern shape on the substrate like a coating type dye. The groove depth is an optical depth of about λ / 8 to λ / 6 with respect to the laser wavelength λ without being buried.

  According to the present invention, a part of the land on both sides of the groove which is a recording track is cut at a specific position with a constant interval, or a part of a recording track constituted by a pit row is set at a specific position with a constant interval. By forming the groove, at least three reproduction signal levels can be obtained, and a detection slice level B different from the detection slice level A of the normal information recording signal is provided between any three levels. The management information specific to the medium of the optical disc that can be detected only by the detected slice level B as in 1 or Example 2 is recorded, or the information that is not detectable at the detected slice level B as in Example 3 is recorded. Recording management information makes it easy to distinguish between regular and unauthorized optical discs, and prevents unauthorized access to management information. It is possible to provide a high security level optical media such as preventing unauthorized copying of the recording information.

  Further, in a flat part larger than the diameter of the laser spot used for recording / reproduction, diffraction due to grooves or pits does not occur, so that the deviation between the beam returning to the optical detector of the pickup and the center of the optical detector is not on the optical disc recording surface. Since this is a tilt, this signal can be fed back and used for tilt correction.

(Examples) Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples without departing from the gist thereof.

The structure of a write-once optical disk used in the present invention is shown in FIG. On the surface of a polycarbonate resin substrate having a diameter of 120 mm and a thickness of 0.6 mm, a wobble groove modulated with address information (ID) with a U-shaped groove with a track pitch of 0.4 μm and a recording track modulated with a constant period are recorded in advance. A formed substrate 111 was prepared. The U-shaped groove had a groove width of about 0.20 nm and a depth of 100 nm. The U-shaped groove was formed for each 64 kB error correction block, and a 91-byte gap region was provided as a flat portion between the error blocks. As a recording layer material formed on the substrate 111, 0.5 g of a porphycene compound dye represented by the following general formula (Chemical Formula 3) is used, and the dye is dissolved in 40 g of tetrafluoropropanol. After ultrasonic dispersion for 30 minutes, the mixture was filtered with a 0.2 μm filter. The dye solution thus prepared was spin-coated on the substrate 111 while accelerating the solution from 500 rpm to 2000 rpm to form the recording layer 114. Next, the substrate 111 coated with the recording layer 114 is dried in an oven at 80 ° C. for 30 minutes, and then an Ag alloy film having a thickness of 100 nm is formed on the recording layer 114 by a sputtering method to form a reflective layer 117. did. Further, an ultraviolet curable resin 119 was spin-coated on the reflective layer 117 to a thickness of 5 μm, and this was cured by irradiating with ultraviolet rays to obtain a substrate with a recording layer. Further, a slow-acting ultraviolet curable adhesive 120 was applied and adhered to the dummy substrate 112 obtained in the same manner except that no recording layer was formed to obtain an optical information recording medium.
General formula

  Alternatively, the ultraviolet curable resin 119 on the reflective layer 117 may not be formed, and the dummy substrate 112 may be directly bonded using the ultraviolet curable adhesive 120 ′. Further, in a part of the information management area, medium identification information such as a write-once medium, recording conditions such as reproduction power, recording power, recording waveform, or management information unique to the medium is recorded on the flat portion (gap area) with a recording mark. Append.

  A first embodiment of a recording medium according to the present invention will be described. FIG. 1 is a schematic diagram of a part of a predetermined area in which identification information unique to a disk, which is a first embodiment of a coated dye recording optical disk according to the present invention, is recorded, and a track-on state on a recording track. The schematic of the signal waveform reproduced | regenerated by is shown. The amount of data required for disc-specific identification information is from several bytes to several tens of bytes, and the length of the cutting mirror area required for this is in the range of several micrometers to several tens of micrometers. Even if the lands on both sides of the groove are cut, tracking does not come off.

  FIG. 4 shows a layout of an optical disk 200 as an example of a recordable medium. Here, the lead-in area 210 is an area where information relating to the recordable medium is recorded and is provided in the inner peripheral part, and this area may be provided in the outer peripheral part. The information recorded in the lead-in area is information necessary for recording / reproducing information to / from the area 211 when accessing the medium, and there is usually no restriction on the arrangement thereof.

  The recording medium of this embodiment is a disk-shaped optical recording medium, and a groove for recording information is spirally or concentrically formed in a range from the inner periphery to the outer periphery, and a predetermined range thereof For example, by using a dedicated servo writer on a recording track that includes a flat portion (gap area) wider than the recording track obtained by cutting a part of the land on both sides of a predetermined range of grooves on the inner circumference side of the disc, the medium unique identification information of the optical disc is obtained. A copy is made illegally by preventing the signal detected at the detected slice level B that is set larger than the unrecorded level of the recording track from being output to the outside separately from the normal detected slice level A. Such an optical disk cannot reproduce the identification information unique to the medium, and is difficult to reproduce. Also, when these illegal discs are played back by a normal optical disc drive, identification information unique to the optical disc cannot be recognized and user information (content data etc.) recorded on the recording track in the information recording area cannot be accessed. The drive device stops the access operation or ejects the optical disc.

  In the case of a coating type dye recording medium, since the dye film thickness applied to the flat portion is thinner than the groove which is the recording track, the reproduction signal amplitude of the recording mark of the identification signal is smaller than the reproduction signal amplitude of the recording track groove, By reducing the signal amplitude of the recording mark of the identification signal recorded on the flat portion, the data recorded on the flat portion cannot detect the identification signal at the normal detection slice level A, and the corresponding recording data block Prevent access to. On the other hand, when the identification signal can be detected at the detected slice level B, recording / reproduction access to the recording data block corresponding to the identification signal can be performed, so that information management for illegal copying can be performed. . Furthermore, a security level can be raised by combining these.

  Separately from the above case, only the dummy signal or the trigger signal may be recorded on the flat portion, and the management information may be recorded on the recording track groove of the data block paired with the flat portion.

  In Example 1, an example of an optical disk using a coating type dye recording film is shown, but in Example 2, an example of an optical disk using a recording film formed in a vacuum such as sputtering is shown.

  Examples of the recording film used here include a write-once recording film such as a silicon alloy or GeSbTe / CoO2, and a rewritable phase change recording film such as AgInSbTe, GeSbTe, GeBiTe, or GeBiSbTe.

  The coating type dye is suitable for on-groove recording in which the groove is thickly filled with the dye and the signal modulation degree of the recording mark is large. However, in the case of a recording film capable of vacuum film formation, the recording track is on the groove as in the first embodiment. However, it may be on land between the grooves or land / groove recording to be recorded on both the grooves and lands, but the dye film thickness depends on the pattern shape on the substrate. The method according to the first embodiment that uses different things cannot be used. Since the flat portion obtained by cutting the groove for recording on the groove and the flat portion obtained by cutting the land for land recording look almost the same as the optical phase depth, Embodiment 2 will be described by taking the recording on the groove as an example. The recording track format is the same as in Example 1 except that the groove depth is about 40 nm which is 1 / 6n of the laser wavelength λ405 nm of the driving device (n is the refractive index of the substrate and n≈1.59 in the case of a polycarbonate substrate). The same. A heat-resistant dielectric film, a recording film, a heat-resistant dielectric film, and a reflective film are laminated on a substrate on which this format pattern is formed, and bonded to a dummy substrate through an ultraviolet curable resin adhesive, and the adhesive is applied by ultraviolet irradiation. Harden. As shown in FIG. 2, when a prepit is provided in a flat part with the same recording track and prepit depth, there are three reproduction signal levels in addition to the unrecorded level, groove part level and prepit level of the flat part. . In this case, since the unrecorded level of the flat portion is higher than the groove level that is the recording track, as in the first embodiment, if the detection slice level B is set between the groove portion level and the unrecorded level of the flat portion, the flat portion is provided. Since no illegal level optical disc can obtain a signal of level B or higher, recognition information unique to the medium of the optical disc is not detected, and recording / reproduction access to the information recording area becomes impossible.

  In the first and second embodiments, the example of the recording area for recording information data in the groove has been described. However, when the system management information area used by the optical disk drive device is formed by prepits, a flat portion is formed in the specific area. On the contrary, at least three reproduction signal levels can be obtained by providing the groove. FIG. 8 shows an embodiment of the present invention. An optical disc master coated with a photoresist is irradiated with an exposure beam modulated by a system management information signal, and exposure is performed by superimposing position information on a groove signal wobbled at a constant cycle, which continuously becomes a recording track of an information recording area. Irradiate the beam. The exposed photoresist master is removed from the laser exposure apparatus, and the format is patterned by the developing process of the exposure unit. The photoresist master on which the format pattern is formed forms a conductive film on the surface by electroless plating or sputtering, and a stamper is produced by a plating process. The stamper after plating is processed into a stamper for substrate formation by backside polishing, stamper peeling, residual resist removal, and inner / outer diameter processing. In the exposure process of the system management information area, a groove signal having an intermediate level of prepit depth is formed by inserting groove signals having an intermediate level of the prepit signal level at specific positions corresponding to the gap area of the first embodiment. The Here, by using the method disclosed in Japanese Patent Application Laid-Open No. 2001-067733, it is also possible to form a groove having an intermediate depth of the prepit and a flat bottom. In this way, by providing the intermediate depth grooves at regular intervals, three reproduction signal levels of the prepit level, the groove level, and the space level can be obtained. By providing the detection slice level C between the groove portion and the space level, it is impossible to form a signal higher than the groove portion level in the groove portion. Therefore, it is possible to identify an unauthorized disk by detecting the presence or absence of a signal in this groove portion. .

  Similarly to the first and second embodiments, the medium unique information of the optical disc is recorded with prepits or recording marks in the grooves provided at regular intervals, and the information recording area is accessed using the medium unique information as key information. It can also be used in combination with management and copy management.

  Further, in the read-only medium, not only the system management information area, but also a groove portion is provided in a portion corresponding to the gap area of the information recording area, and the medium specific information of the optical disc is recorded with prepits or recording marks, thereby the information recording area It can be used for access management and copy management, and can also be managed by changing the management level to data program units or contents.

  In FIG. 8, the gap regions are aligned in the radial direction, but in the case of CLV recording, they are provided at different positions in adjacent tracks. In the first embodiment, the second embodiment, and the third embodiment, it is not necessary to perform the process for all the gap regions, and a part of unrecorded or a part of dummy signal may be recorded. For example, when recording in multi-session, a gap signal in the information recording area of each session records a linking information for data linking or a gap signal as an area, but there is a gap in an area for managing these recording information. By recording the trigger signal for accessing the recording information in the area and the security key information for restricting access, a signal having a reproduction signal level different from that of the recording information area is obtained, and this signal is detected at the detection slice level B. Therefore, it can be used for access management and copy management of recorded information. In addition, the capacity of each session may be fixed uniformly in units of 140 Mbytes of 80 mm CD or 650 Mbytes of 120 mm CD, or may be configured by a plurality of units, and can be set when recording medium-specific management information in the gap area in advance. A management level can be set for each session.

  An outline of the signal detection circuit and the optical disk drive of the present invention is shown in FIGS. In each of the optical disc media according to the first embodiment, the second embodiment, and the third embodiment, an area having a reproduction signal level different from that of the recording track is provided for information management, and the recording mark of the recording track is set by appropriately setting the detected slice level. At least three reproduction signal levels can be detected by detection level A to be detected and detection level B or detection level C to detect medium-specific management information.

Since there is a signal level change at the boundary between the recording track and the area where the medium specific management information is recorded, the medium specific management information area is detected by the detection level B, and the management information recorded in this area is read. Here, since the management information and the recording mark (recording data) of the recording track can be detected even at the detection level A, the following two methods are possible:
(1) Detect three values simultaneously at detection level B and detection level A.
(2) After detecting the medium specific management information at the detection level B, an offset is added to the detection level B to lower it to level A, and the recording data of the recording track is detected.
In particular, the sequential detection method of (1) has a simpler signal detection circuit than (1), but the processing steps are complicated, but it is effective because it can be handled by upgrading the firmware of a conventional device. It is a technique. In the case of a read-only disc, detection level C and detection level A can be the same as (1) and (2).

  Since the regular optical disk exemplified in the embodiment of the present invention has the ternary level medium-specific management information, the ternary level cannot be detected by an illegally copy-recorded optical disk, or from the beginning of the medium-specific information area. Since the time phase is shifted, the regular optical disk drive device can easily recognize that the disk is an illegal disk, and executes ejection of the disk, display of an illegal disk, and access stop.

  Further, in a normally recorded disc, the flat portions arranged at regular intervals are larger than the diameter of the recording / reproducing laser spot, and therefore can be used as a tilt correction region that is not affected by the format pattern.

It is the schematic which shows Embodiment 1 of this invention. It is the schematic (1) which shows Embodiment 2 of this invention. It is a figure which shows the structure of the coating type pigment-type optical disk of this invention FIG. 3 is a schematic diagram of a medium layout of the present invention. It is a format example of the medium specific information recording area of the present invention. It is the schematic of the signal detection circuit of this invention It is the schematic of the optical disk drive device of this invention. It is the schematic which shows Embodiment 3 of this invention.

Explanation of symbols

111 Coating type dye recording film substrate 112 Dummy substrate 114 Coating type dye recording film 117 Silver alloy reflective film 119 UV curable resin protective layer 120 Adhesive layer 200 Optical disc 210 Management information area 211 Information recording area

Claims (8)

An optical disc comprising an information recording area for recording information and an information management area for managing data in the information recording area,
An information management area for accessing the optical disc is provided outside the information recording area,
A flat portion is formed from a recording track width obtained by partially cutting lands on both sides of the groove in the recording track direction formed by the groove in at least the information management area, and disc-specific identification information is recorded on at least the flat portion. An optical disc characterized by that. An optical disc comprising an information recording area for recording information and an information management area for managing data in the information recording area,
An information management area for accessing the optical disc is provided outside the information recording area,
A flat portion is formed from the recording track width obtained by partially cutting the lands on both sides of the groove in the recording track direction formed at least in the information management area, and at least the flat portion has access to disc-specific identification information. An optical disc in which a trigger signal for recording is recorded. An optical disc comprising an information recording area for recording information and an information management area for managing data in the information recording area,
An information management area for accessing the optical disc is provided outside the information recording area,
A recording mark formed at least in the information management area in the direction of the recording track formed by the groove and having a flat part wider than the recording track obtained by partially cutting the lands on both sides of the groove, and at least the recording mark irreversibly added to the flat part. An optical disc characterized by recording disc-specific identification information.   3. The optical disk according to claim 1, wherein the flat portions are areas provided at regular intervals in the recording track direction and used for tilt correction.   5. The optical disc according to claim 4, wherein the flat portion is provided for each error correction block.   An optical disk recording / reproducing method using the optical disk according to claim 1 or 2, wherein a recording slice reproduction signal A of a recording mark recorded in a groove which is a recording track is set, and the recording is recorded on a flat portion. A detection slice level B is provided as the reproduction signal level of the mark, the detection slice level B is set to a level at which the reproduction signal of the recording mark recorded on the recording track is not detected, and the reproduction signal is detected by the detection slice level B. An optical disk recording / reproducing method that enables recording or reproduction on a recording track.   7. An optical disk drive apparatus using the recording / reproducing method according to claim 6, wherein when a reproduction signal is not detected by the slice level B, access to a recording track of the optical disk mounted on the recording / reproducing apparatus is stopped, An optical disc driving apparatus that performs an operation of ejecting the optical disc. 3. The optical disc according to claim 1 or 2, wherein the information recording area is a recording unit of a recording medium having a lower recording capacity and is arranged in a multi-session physically fixed in advance. A flat portion is formed by the recording track width obtained by partially cutting the land on both sides of the groove in the recording track direction formed by the groove in the information management area for each section, and at least the flat portion has disc-specific identification information. An optical disc on which is recorded.

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