JP2007080406A - Optical recording medium - Google Patents

Abstract

An optical recording medium capable of setting optimum recording conditions for each optical recording medium and enabling suitable recording.
A substrate 101 and multilayer recording layers 102 and 105 provided on the substrate 101 are provided, and information recording is performed by causing a change in optical properties of the recording layers 102 and 105 by irradiation of a laser beam. In the optical recording medium 100, judgment information relating to the recording conditions of the optical recording medium 100 is recorded in advance so as to be readable by laser light irradiation.
[Selection] Figure 1

Description

  The present invention is applied to an optical recording medium, particularly an optical recording medium such as a recordable compact disc (CD-R / RW) and DVD-R / RW, DVD + R / + RW.

  The storage capacity of information recording media has been increasing year by year, and various methods have been studied. As an optical recording medium (optical disk), an optical recording medium having a plurality of data surfaces (having a multi-layered recording layer) has been studied.

  Here, a technique is disclosed in which a servo layer is formed in advance on an optical recording medium in a bulk state, and thereby recording is accurately performed on a data layer at a position corresponding to the servo layer while performing focus and tracking servo ( For example, see Patent Document 1.) In the conventional optical recording medium, servo signals for recording and reproduction are embedded in the optical recording medium in some form, and good recording can be performed according to the servo signals.

JP 2002-31958 A JP 2002-63738 A Japanese Patent Laid-Open No. 2003-85761 International Publication No. WO01 / 099103 Japanese Patent No. 3128313 Japanese Unexamined Patent Publication No. 7-50014 Japanese Patent No. 3643179 Japanese Patent No. 3209126 Japanese Patent Laid-Open No. 2001-67721

  However, there are many types of optical recording media, servo characteristics and recording methods are different, and it is difficult to perform appropriate recording according to the type of optical recording media, and recording and reproduction cannot be performed due to deterioration in recording quality. There was a thing.

  The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide an optical recording medium in which optimum recording conditions can be set for each optical recording medium and suitable recording can be performed.

The present inventors pay attention to the fact that servo characteristics and recording methods differ depending on the manufacturing method in a multilayer optical recording medium, and as a result of intensive studies, the above problems are solved by the following inventions (1) to (10). Found to be solved by. That is,
(1) In an optical recording medium comprising a substrate and a multilayer recording layer provided on the substrate, and recording information by causing a change in optical properties of the recording layer by irradiation with laser light, An optical recording medium characterized in that judgment information relating to recording conditions of the optical recording medium is recorded so as to be readable by laser light irradiation.
(2) The optical recording medium according to (1), wherein the determination information relates to a method for forming the recording layer.
(3) The optical recording medium according to (2), wherein the determination information identifies a type of a method for forming the recording layer based on whether information is recorded on the substrate.
(4) An optical recording medium having a guide groove that scans a laser beam when information is recorded on the recording layer, wherein the determination information is recorded on each of the concave protrusions of the guide groove. The optical recording medium according to (2), wherein the optical recording medium indicates that the thickness varies depending on the method of forming the recording layer.
(5) The optical recording medium according to (2), wherein the recording layer is formed by applying a recording layer material in a liquid state.
(6) The optical recording medium according to (1), wherein the determination information is recorded as meandering guide grooves that scan a laser beam when information is recorded on the recording layer.
(7) The optical recording medium according to (1), wherein the determination information is recorded as phase-modulated information.
(8) The optical recording medium according to (1), wherein the determination information is recorded by being included in manufacturer information or version information of the optical recording medium.
(9) In the case where the optical recording medium is a DVD + R recording medium or a DVD + RW recording medium, the determination information is recorded by being included in revision information of the optical recording medium (1 ) Optical recording medium.
(10) The optical recording medium according to (9), wherein when the revision information is 1-byte information, the determination information is recorded within the upper 5 bits.

As an effect of the present invention, according to the first aspect of the present invention, optimum recording conditions can be set for each optical recording medium based on the determination information, and suitable recording becomes possible.
According to the second to fourth aspects of the present invention, it is possible to set an optimum recording condition for each optical recording medium based on the information relating to the method for forming the recording layer, and suitable recording becomes possible. It is particularly suitable for an optical recording medium having a plurality of recording layers.
According to the invention of claim 5, it is possible to provide an optical recording medium provided with the determination information that does not affect the reproducing apparatus.
According to the sixth aspect of the present invention, the determination information can be densified by adding the determination information to the recording guide groove.
According to the seventh to tenth aspects of the present invention, it is possible to provide an optical recording medium provided with the determination information that does not affect the conventional recording apparatus.

The configuration of the optical recording medium according to the present invention will be described below.
An optical recording medium according to the present invention includes a substrate and a multilayer recording layer provided on the substrate, and records information by causing a change in optical properties of the recording layer by irradiation with a laser beam. In the medium, judgment information regarding the recording conditions of the optical recording medium is recorded in advance so as to be readable by laser light irradiation.

  The optical recording medium referred to in the present invention is, for example, a DVD-RAM / WO, DVD-R, DVD + R and DVD-RAM, DVD-RW, DVD + RW recording medium, and a writable (recordable) DVD (Digital Versatile). Disc). The former DVD-RAM / WO, DVD-R, and DVD + R are DVDs that can be written only once (also referred to as DVD Write Once). The latter DVD-RAM, DVD-RW, and DVD + RW are DVDs that can be written a plurality of times.

  Here, an undercoat layer or a protective layer may be provided between the recording layer and the substrate, and each layer may have a laminated structure of two or more layers in order to improve the function. An example of the configuration is shown in FIGS.

  FIG. 1 shows an optical recording medium 100 of the present invention as a first substrate 101 / L0 recording layer 102 / L0 reflecting layer 103 / adhesive layer (not shown) / L1 recording layer 105 / L1 reflecting layer on the recording light incident side. An example of a structure composed of 106 / second substrate (protective substrate) 107 is shown.

  FIG. 2 shows an optical recording medium 200 of the present invention as a first substrate 201 / L0 recording layer 202 / L0 reflecting layer 203 / L1 recording guide groove forming layer 204 / L1 recording layer 205 / L1 on the recording light incident side. An example of a structure composed of a reflective layer 206 / second substrate (protective substrate) 207 is shown. The constituent materials of the layers of the optical recording media 100 and 200 may be the same.

  The first substrates 101 and 201 must be transparent to the laser used when the optical recording medium performs recording / reproduction from the substrate side, but when the recording / reproduction is performed from the recording layer side. Need not be transparent. As the substrate material, for example, a polyester resin, an acrylic resin, a polyamide resin, a polycarbonate resin, a polyolefin resin, a phenol resin, an epoxy resin, a polyimide resin such as a polyimide resin, glass, ceramic, metal, or the like can be used. A tracking guide groove or guide pit and a preformat such as an address signal may be formed on the surface of the substrate.

  The recording layers 102, 105, 202, and 205 are intended to cause some optical change by irradiation with laser light and record information by the change, and the material is composed mainly of an organic dye. Here, the main component means that it contains a sufficient amount of an organic dye necessary for recording and reproduction, but usually only an organic dye is used except for a small amount of additives that are appropriately added as necessary. The recording layer may be a single organic dye layer or a laminate of an organic dye layer and a reflective layer in order to increase reflectance.

  Examples of organic dyes include azo, formazan, dipyrromethene, (poly) methine, naphthalocyanine, phthalocyanine, tetraazaporphyrin, squarylium, croconium, pyrylium, naphthoquinone, anthraquinone (in) (Dansylene), xanthene, triphenylmethane, azulene, tetrahydrocholine, phenanthrene, triphenothiazine dyes, or metal complexes thereof. Among these, azo (metal chelate) dye, formazan (metal chelate) dye, squarylium (metal chelate) dye, dipyrromethene (metal chelate) dye, trimethine cyanine dye, and tetraazaporphyrin dye are preferable.

  As the thermal decomposition characteristics, the above dyes preferably have a decomposition start temperature of 100 to 360 ° C, particularly preferably 100 to 350 ° C. If the decomposition start temperature exceeds 360 ° C., pit formation at the time of recording is not performed well, and jitter characteristics deteriorate. Further, if the temperature is lower than 100 ° C., the storage stability of the disk deteriorates.

  For the purpose of improving optical characteristics, recording sensitivity, signal characteristics, etc., the above dyes may be mixed with other organic dyes, metals, metal compounds, or a layer composed of a dye layer and other organic dyes, metals, metal compounds. May be laminated.

Examples of such metals and metal compounds include In, Te, Bi, Se, Sb, Ge, Sn, Al, Be, TeO ₂ , SnO, As, Cd, and the like. It can be used by laminating.

  Furthermore, various materials such as ionomer resin, polyamide resin, vinyl resin, natural polymer, silicone, liquid rubber, or a silane coupling agent may be dispersed and mixed in the dye, For the purpose of improving the properties, stabilizers (for example, transition metal complexes), dispersants, flame retardants, lubricants, antistatic agents, surfactants, plasticizers and the like can be used together.

The recording layers 102, 105, 202, and 205 can be formed by ordinary means such as vapor deposition, sputtering, CVD, and solvent coating. When the coating method is used, the above-described dye or the like can be dissolved in an organic solvent, and the coating can be performed by a conventional coating method such as spraying, roller coating, dipping, or spin coating.
Organic solvents generally used include alcohols such as methanol, ethanol and isopropanol; ketones such as acetone, methyl ethyl ketone and cyclohexanone; amides such as N, N-dimethylformamide and N, N-dimethylacetamide; sulfoxides such as dimethyl sulfoxide Ethers such as tetrahydrofuran, dioxane, diethyl ether and ethylene glycol monomethyl ether; esters such as methyl acetate and ethyl acetate; aliphatic halogenated hydrocarbons such as chloroform, methylene chloride, dichloroethane, carbon tetrachloride and trichloroethane Aromatics such as benzene, xylene, monochlorobenzene and dichlorobenzene; cellosolves such as methoxyethanol and ethoxyethanol; hexane and penta , Cyclohexane, and hydrocarbons such as methylcyclohexane.

  The film thickness of the recording layers 102, 105, 202 and 205 is 10 nm (100 mm) to 10 μm, preferably 20 to 200 nm (200 to 2000 mm).

  Examples of the material of the reflective layers 103, 106, 203, and 206 include Au, Ag, Cr, Ni, Al, Fe, Sn, and the like, which are highly corrosive metals and metalloids that are not easily corroded. Au, Ag, and Al are particularly preferable from the viewpoint of rate and productivity. In addition, these metals and metalloids may be used alone or as two or more alloys. Examples of the film forming method include vapor deposition and sputtering, and the film thickness is 5 to 500 nm (50 to 5000 mm), preferably 10 to 300 nm (100 to 3000 mm).

  Any material can be used as the material for the adhesive layer as long as it can adhere two recording media. In view of productivity, an ultraviolet curable adhesive or a hot-melt adhesive is preferable. The L1 recording guide groove forming layer 204 is preferably an ultraviolet curable resin. In this case, a material suitable for peeling off the stamper forming the L1 recording guide groove is suitable.

It is also preferable to provide an undercoat layer in order to suppress corrosion on the L0 reflective layers 102 and 202.
The undercoat layer consists of (1) improved adhesion, (2) a barrier such as water or gas, (3) improved storage stability of the recording layer, (4) improved reflectance, and (5) a substrate from a solvent. And (6) guide grooves, guide pits, and preformats.

For the purpose of (1), various polymer compounds such as ionomer resin, polyamide resin, vinyl resin, natural resin, natural polymer, silicone, liquid rubber, or a silane coupling agent can be used. . For the purposes (2) and (3), in addition to the polymer material, inorganic compounds such as SiO, MgF, SiO ₂ , TiO, ZnO, TiN, and SiN can be used. Metals or semimetals such as Cu, Ni, Cr, Ge, Se, Au, Ag, and Al can be used. For the purpose (4), an organic thin film having a metallic luster made of a metal such as Al, Au or Ag, a methine dye, a xanthene dye, or the like can be used. For the purposes (5) and (6), an ultraviolet curable resin, a thermosetting resin, a thermoplastic resin, or the like can be used.

  The thickness of the undercoat layer is 0.01 to 30 μm, preferably 0.05 to 10 μm.

  The protective layer and the hard coat layer on the substrate surface are (1) protection from scratches, dust and dirt on the recording layer (reflection / absorption layer), (2) improvement in storage stability of the recording layer (reflection / absorption layer), (3 ) Used for the purpose of improving the reflectance. For these purposes, the same material as the undercoat layer can be used. Also heat of polymethyl acrylate resin, polycarbonate resin, epoxy resin, polystyrene resin, polyester resin, cellulose resin, aliphatic hydrocarbon resin, natural rubber, styrene butadiene resin, chloroprene rubber, wax, alkyd resin, drying oil, rosin, etc. Organic materials such as softening and heat-melting resins can also be used. The most preferable is an ultraviolet curable resin excellent in productivity.

  The film thickness of the protective layer or the substrate surface hard coat layer is 0.01 to 30 μm, preferably 0.05 to 10 μm.

  As in the case of the recording layer, the undercoat layer, protective layer and substrate surface hard coat layer may contain a stabilizer, a dispersant, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer, and the like. it can.

  The second substrates 107 and 207 must be transparent to the laser beam used when irradiating laser light from the second substrate (protective substrate) side, but are transparent when used as a simple protective plate. It does not have to be. The protective substrate material that can be used is exactly the same as the above substrate material, such as polyester resin, acrylic resin, polyamide resin, polycarbonate resin, polyolefin resin, phenol resin, epoxy resin, polyimide resin, or glass, ceramic, metal, etc. Can be used. Further, the cost can be reduced by using the same material as the first substrates 101 and 201.

Here, there are roughly two methods for manufacturing an optical recording medium which is judgment information regarding the recording conditions of the optical recording medium.
As a first method, the L0 recording layer 102 and the L0 reflecting layer 103 are formed on the first substrate 101, the L1 reflecting layer 106 and the L1 recording layer 105 are formed on the second substrate 107, and bonded to each other with an adhesive layer. A laminating method is mentioned.
As a second method, after forming the L0 recording layer 202 and the L0 reflecting layer 203 on the first substrate 201, a recording guide groove is formed on the L1 recording guide groove forming layer 204, and then the L1 recording layer 205 is formed thereon. And a 2P (photopolymer) method in which the second substrate 207 is bonded after the L1 reflective layer 206 is formed.

  In these two methods, a difference occurs between the recording guide grooves and the incident direction of the recording light when the L0 recording layer and the L1 recording layer are formed. For example, in the reverse stacking method, the L0 recording layer 102 is formed on the surface of the incident light side first substrate 101 where the recording guide groove is cut, and the L1 recording layer 105 is the second substrate 107 opposite to the incident light. The recording guide groove is formed on the cut surface. However, in the 2P method, the L0 recording layer 201 and the L1 recording layer 205 are respectively formed on the first substrate 201 on the incident light side and on the surface on which the recording guide groove is cut on the L1 recording guide groove forming layer 204. Has been. Here, when the recording layer is formed by applying a recording layer material in a liquid state, the thickness varies depending on the unevenness of the recording guide groove. Therefore, in the two manufacturing methods, the L1 recording guide groove as viewed from the incident light side (the recording guide groove on the second substrate 107 in the reverse lamination method, and the recording groove forming layer 204 in the L1 recording in the 2P method). The thicknesses of the L1 recording layers 105 and 205 with respect to the unevenness of the guide groove) are different, resulting in differences in servo conditions and recording light emission waveform shapes that are optimal for recording on the respective optical recording media.

  The judgment information relating to the recording conditions of the optical recording medium, which is recorded in advance on the optical recording medium of the present invention, is preferably information relating to the manufacturing method of the optical recording medium as described above, more preferably the recording layer. The present invention relates to a forming method. More preferably, the determination information indicates that the thickness of the recording layer provided on each of the concave and convex portions of the recording guide groove varies depending on the method of forming the recording layer.

  In addition, the determination information regarding the recording conditions of the optical recording medium may identify the type of the recording layer forming method based on whether information is recorded on the substrate. For example, it is assumed that predetermined information is recorded on the substrate 101 in the case of the reverse lamination method, and no predetermined information is recorded in the substrate 201 in the case of the 2P method.

  Alternatively, as the format of the determination information, it is preferable that the determination information is included in the manufacturer information or version information of the optical recording medium that can be arbitrarily entered by the optical recording medium manufacturer.

  When the optical recording medium is a DVD + R recording medium or a DVD + RW recording medium, the determination information may be recorded by being included in revision information of the optical recording medium that can be arbitrarily described by the manufacturer. This eliminates the need to consider compatibility with existing drives. At this time, if the revision information is 1-byte information, the determination information is preferably recorded within the upper 5 bits.

  Such determination information regarding the recording conditions of the optical recording medium includes guide grooves (a recording guide groove on the first substrate 101 and / or the second substrate 107, a first guide groove for scanning the laser beam when information is recorded on the recording layer). It is preferably recorded as meandering of one substrate 201 and / or recording guide groove of the L1 recording guide groove forming layer 204. The determination information may be recorded as phase-modulated information. Thereby, in the recording apparatus described later, determination information relating to the recording condition of the optical recording medium can be acquired together with other information read by scanning the recording guide groove during recording on the recording layer.

  As described above, by adding information to the recording guide groove as a method for identifying judgment information relating to the recording conditions of the optical recording medium, the information can be read only by the recording device, and there is no need to consider the compatibility of the reproducing device. . In addition, recording density can be improved by describing a high-frequency signal using a phase modulation method.

  In this embodiment, an example of an optical recording medium having two recording layers is shown. However, even in an optical recording medium having more recording layers, the recording guide groove and the recording layer forming method are essentially different. However, it is possible to implement the present invention.

The optical recording medium of the present invention records and reproduces information by a recording apparatus as shown in FIG.
FIG. 3 is a functional block diagram showing an example of the configuration of the main part of a recording apparatus for an optical recording medium. In the figure, 100 (200) is an optical recording medium, 2 is a spindle motor, 3 is an optical pickup, 4 is a motor driver, 5 is a read amplifier, 6 is a servo means, 7 is a DVD decoder, 8 is an ADIP decoder, and 9 is a laser. Controller, 10 DVD encoder, 11 DVD-ROM encoder, 12 buffer RAM, 13 buffer manager, 14 DVD-ROM decoder, 15 API / SCSI interface, 16 D / A converter, 17 ROM, 18 Represents a CPU, 19 represents a RAM, 20 represents a pulse generator, LB represents a laser beam, and Audio represents an audio output signal.

  In FIG. 3, arrows indicate the direction in which data mainly flows, and in order to simplify the drawing, the CPU 18 that controls each block in FIG. Is omitted. The ROM 17 stores a control program written in a code readable by the CPU 18. When the power of the optical recording medium recording apparatus is turned on, the program is loaded into a main memory (not shown), and the CPU 18 controls the operation of each unit in accordance with the program and stores data necessary for the control. The data is temporarily stored in the RAM 19. The configuration and operation of the optical recording medium recording apparatus are as follows. The optical recording medium 100 (200) is rotationally driven by the spindle motor 2. The spindle motor 2 is controlled by the motor driver 4 and the servo means 5 so that the linear velocity or the angular velocity is constant. This linear velocity or angular velocity can be changed stepwise.

  The optical pickup 3 includes a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element, and a position sensor (not shown), and irradiates the optical recording medium 100 (200) with a laser beam LB. The optical pickup 3 can be moved in the sledge direction by a seek motor. These focus actuators, track actuators, and seek motors are designed to make the spot of the laser beam LB on the optical recording medium 100 (200) by the motor driver 4 and the servo means 5 based on signals obtained from the light receiving element and the position sensor. It is controlled to be located in the place.

  At the time of reading, the reproduction signal obtained by the optical pickup 3 is amplified by the read amplifier 5 and binarized. In the read amplifier, it is binarized mainly through a process of normalizing the longest signal amplitude and a waveform equivalent function for amplifying the recordable mark signal. The input binarized data is demodulated 8/16 in the DVD decoder 7. Note that the recording data is modulated in units of 8 bits and modulated (8/16 modulation). In this modulation, 8 bits are converted to 16 bits. In this case, the combined bits are attached so that the number of previous “1” s and “0” s are equal on average. This is called “DC component suppression”, and the slice level fluctuation of the DC-cut reproduction signal is suppressed.

  The demodulated data is subjected to deinterleaving and error correction. Thereafter, this data is input to the DVD-ROM decoder 14, and further error correction processing is performed in order to increase the reliability of the data. The data that has been subjected to the error correction processing twice as described above is temporarily stored in the buffer RAM 12 by the buffer manager 13 and is arranged as sector data to the host computer (not shown) via the ATAPI / SCSI interface 15. It is transferred at a stretch. In the case of music data, the data output from the DVD decoder 7 is input to the D / A converter 16 and extracted as an analog audio output signal Audio.

  At the time of writing, data sent from the host computer through the ATAPI / SCSI interface 15 is temporarily stored in the buffer RAM 12 by the buffer manager 13. Thereafter, the write operation is started. In this case, it is necessary to position the laser spot at the write start point before that. In DVD + RW / + R, this point is calculated | required by the wobble signal carved by the meandering of the track on the optical recording medium 100 (200) previously.

  Note that the above points are obtained by land pre-pits instead of wobble signals in DVD-RW / -R, and by pre-pits in DVD-RAM / RAM / WO.

  The wobble signal in the DVD + RW / + R recording medium includes address information called ADIP (ADress In Pre-groove), and this information is extracted by the ADIP decoder 8. The synchronization signal generated by the ADIP decoder 8 is input to the DVD encoder 10 so that data can be written at an accurate position on the optical recording medium 100 (200). The data in the buffer RAM 12 is subjected to 8/16 conversion as a recording signal by adding an error correction code or interleaving in the DVD-ROM encoder 11 or the DVD encoder 10.

  The signal modulated for recording is converted into a recording light waveform suitable for the recording medium by the pulse generator 20 and recorded on the optical recording medium 100 (200) via the laser controller 9 and the optical pickup 3. In order to correct the efficiency of the optical pickup, the diffracted light of the recording light can be directly measured by the light receiving element, and the recording power of the laser controller 9 can be changed by the power fluctuation. As a method for correcting the recording power with respect to the optical recording medium, it is possible to measure the recording power efficiency with respect to the optical recording medium and correct the recording power of the laser controller 9 from the fluctuation of the reflected light during light emission after recording. The address control method may be a configuration in which address information is obtained from land prepits or prepits.

FIG. 4 is a schematic diagram of an information processing apparatus using this optical recording medium recording apparatus.
The information processing apparatus 50 includes an optical disk device (recording device) 51, a main control device 52, an interface 53, a recording device (HDD) 54, an input device 55, a display device 56, and the like.

  The main control device 52 includes a microcomputer, a main memory (both not shown) and the like, and controls the entire information processing device 50.

  The interface 53 is a bidirectional communication interface with the optical recording medium recording device 51, and conforms to standard interfaces such as ATAPI and SCSI. The interface 53 is connected to the interface 15 of the optical recording medium recording apparatus. The connection form between the interfaces may be not only a cable connection using a communication line such as a communication cable (for example, a SCSI cable) but also a wireless connection using infrared rays.

  The recording device (hard recording medium HDD) 54 stores a program written in a code readable by the microcomputer of the main control device. When the information processing apparatus is powered on, the program is loaded into the main memory of the main control apparatus.

  The display device 56 includes a display unit (not shown) such as a CRT, a liquid crystal display (LCD), and a plasma display panel (PDP), and displays various information from the main control device.

  The input device 55 includes at least one input medium (not shown) of, for example, a keyboard, a mouse, and a pointing device, and notifies the main control device of various information input by the user. Note that information from the input medium may be input in a wireless manner. Further, as an integrated display device and input device, for example, there is a CRT with a touch panel.

  Further, the information processing apparatus is equipped with an operating system (hereinafter referred to as “OS”). It is assumed that all devices constituting the information processing apparatus are managed by the OS.

  As a recording apparatus that achieves the effects of the present invention, it has a function of reading out information relating to the manufacturing method of the optical recording medium 100 (200) as judgment information relating to the recording conditions of the optical recording medium, This can be realized by having a function for comparison and reference, and a recording condition setting function (servo setting, recording light emission waveform setting) suitable for the optical recording medium corresponding to the referenced manufacturing method.

  For example, when the recording / reproducing apparatus of FIG. 3 is used, the CPU 18 has a function of calculating a recording waveform in accordance with the measured conditions, and the pulse generator 20 has a function of recording by changing the recording waveform. It is feasible. As the recording waveform deformation condition, the set value of the recording power of the laser controller 9 is suitable.

  In addition, if there is an optimized setting from the manufacturer information, version information, etc. of the optical recording medium, the setting condition is used, and a recording method more suitable for each medium is obtained by using information on the manufacturing method of only the unknown optical recording medium. Can be set.

  As a configuration necessary for the recording apparatus of the present invention, a condition for changing a recording waveform is evaluated for a function of recording on an optical recording medium in a general CD-R / RW drive, DVD-R, DVD-RW, and DVD + RW drive. This can be realized by having a function to perform recording and a function to continue recording by changing the recording waveform.

FIG. 5 shows an example of a procedure for determining recording conditions (servo parameters, recording strategy parameters) on the optical recording medium.
Here, a step (S1) of determining whether information such as the corresponding recording speed and type of the optical recording medium is known (whether the drive recognizes) and a step of determining whether the manufacturer information and version information of the optical recording medium are known. (S2) and a step (S3) for determining whether the manufacturing method of the optical recording medium is known from the revision information. By changing the servo setting and the recording strategy according to the conditions determined in each step, It is possible to set recording conditions for each recording medium.

Hereinafter, effects of the present invention will be described based on examples.
In this embodiment, a double layer type DVD + R (DVD + R_DL) disc is used, and information (manufacturing information) relating to the manufacturing method of the optical recording medium is described as a signal engraved as a meandering guide groove for recording in the information format shown in FIG. .
Specifically, an optical recording medium that is prepared by the reverse lamination method as a sample of Example 1 and records “1” as discrimination information in the area corresponding to the symbol X in the information format shown in FIG. An optical recording medium in which “0” is recorded as discriminating information in the area corresponding to the symbol X in the information format shown in FIG. 6B, a sample of a comparative example, and a reverse lamination method. In the information format shown in FIG. 6B, an optical recording medium in which the discrimination information is not described in the area corresponding to the symbol X was used.

  In the optical recording medium of the present embodiment, the area where the manufacturing information is described (the area corresponding to the symbol X in the information format shown in FIG. 6B) is an area where the optical recording medium manufacturer can write arbitrary information (revision) Information), which is an area not used for recognition of an optical recording medium in a conventional recording apparatus. Therefore, recording / reproduction can be performed as usual for a recording apparatus that does not support the present invention.

  As an embodiment of the present invention, whether a recording / reproducing operation can be performed in a recording apparatus having the function shown in FIG. 3 was evaluated. In the recording apparatus of the present embodiment, the recording method of the optical recording medium of the 2P method is adopted as the recording light waveform and the servo condition of the unknown recording medium in which the manufacturing conditions are not described.

The results are shown in Table 1.
In the embodiment of the present invention, both optical recording media were recordable / reproducible. However, in the comparative example, the focus servo characteristics for the optical recording media did not match and a recording error occurred.

It is sectional drawing which shows the structural example (1) of the optical recording medium based on this invention. It is sectional drawing which shows the structural example (2) of the optical recording medium based on this invention. 1 is a block diagram showing a configuration of a recording apparatus suitable for an optical recording medium of the present invention. It is a block diagram which shows the structural example of the information processing apparatus provided with the recording device shown in FIG. 4 is a flowchart illustrating an example of a procedure for determining a recording condition on an optical recording medium in the recording apparatus illustrated in FIG. 3. It is a figure which shows the example of the information format recorded on the optical recording medium of this invention.

Explanation of symbols

2 spindle motor 3 optical pickup 4 motor driver 5 read amplifier 6 servo means 7 DVD decoder 8 ADIP decoder 9 laser controller 10 DVD encoder 11 DVD-ROM encoder 12 buffer RAM
13 Buffer Manager 14 DVD-ROM Decoder 15 ATAPI / SCSI Interface 16 D / A Converter 17 ROM
18 CPU
19 RAM
20 Pulse Generator 50 Information Processing Device 51 Optical Disc Device (Recording Device)
52 Main controller 53 Interface 54 Recording device (HDD)
55 Input device 56 Display device 100, 200 Optical recording medium 101, 107, 201, 207 Substrate 102, 105, 202, 205 Recording layer 103, 106, 203, 206 Reflective layer 204 L1 recording guide groove forming layer

Claims (10)

In an optical recording medium comprising a substrate and a multilayer recording layer provided on the substrate, and recording information by causing a change in optical properties of the recording layer by irradiation with laser light,
An optical recording medium characterized in that judgment information relating to recording conditions of the optical recording medium is recorded in advance so as to be readable by laser light irradiation.   The optical recording medium according to claim 1, wherein the determination information relates to a method for forming the recording layer.   The optical recording medium according to claim 2, wherein the determination information identifies a type of the recording layer forming method based on whether or not information is recorded on the substrate. An optical recording medium having a guide groove for scanning a laser beam when recording information on the recording layer,
3. The light according to claim 2, wherein the determination information indicates that a thickness of a recording layer provided on each of the concave and convex portions of the guide groove varies depending on a method of forming the recording layer. recoding media.   The optical recording medium according to claim 2, wherein the recording layer is formed by applying a recording layer material in a liquid state.   The optical recording medium according to claim 1, wherein the determination information is recorded as meandering guide grooves that scan a laser beam when information is recorded on the recording layer.   2. The optical recording medium according to claim 1, wherein the determination information is recorded as phase-modulated information.   2. The optical recording medium according to claim 1, wherein the determination information is recorded by being included in manufacturer information or version information of the optical recording medium. In the case where the optical recording medium is a DVD + R recording medium or a DVD + RW recording medium,
2. The optical recording medium according to claim 1, wherein the determination information is recorded by being included in revision information of the optical recording medium.   10. The optical recording medium according to claim 9, wherein, when the revision information is 1-byte information, the determination information is recorded within the upper 5 bits.

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