Classifications

• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
  • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
  • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
  • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
  • G11B7/248—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes porphines; azaporphines, e.g. phthalocyanines
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
  • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
  • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
  • G11B7/24073—Tracks
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
  • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
  • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
  • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
  • G11B7/247—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes
  • G11B7/2472—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes cyanine
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
  • G11B7/263—Preparing and using a stamper, e.g. pressing or injection molding substrates
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
  • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
  • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
  • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
  • G11B2007/24612—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes two or more dyes in one layer
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/2403—Layers; Shape, structure or physical properties thereof
  • G11B7/24035—Recording layers
  • G11B7/24038—Multiple laminated recording layers
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
  • G11B7/24073—Tracks
  • G11B7/24079—Width or depth
• • G—PHYSICS
  • G11—INFORMATION STORAGE
  • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
  • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
  • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
  • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
  • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
  • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
  • G11B7/259—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/146—Laser beam
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

• the present invention relates to an optical recording medium, and more particularly to an optical recording medium using an organic dye as a recording layer and a method for producing the same.
• An optical recording medium using an organic dye material as a recording layer (hereinafter referred to as an organic dye-type optical recording medium) is provided with a recording layer containing an organic dye as a main component on a transparent substrate such as plastic.
• the information is recorded at high density by scanning the laser beam integrated on the surface of the recording layer and forming pits only on the irradiated surface.
• the CD-R (Recordable CD: Compact Disc, registered trademark) DVD—R, DVD + R (recordable DVD: Digital Versatile Disc, registered trademark), etc. have been put into practical use. Since these organic dye-type optical recording media have a simple structure and can be manufactured at low cost, they are widely accepted in the field for knocking up data and images and for music applications.
• Information is recorded on the organic dye-type optical recording medium in a heat mode.
• the irradiated organic dye absorbs the laser light and decomposes by heat. Since the portion where the organic dye is decomposed has a different reflectance from the portion where the organic dye is not decomposed, pits are formed in the recording layer. Therefore, in organic dye-type optical recording media, a mechanism for absorbing heat becomes important. The amount of heat necessary for decomposing the organic dye in the recording layer is determined by the laser light quantity and the absorption spectrum. In organic dye-type optical recording media, these balances determine the reflectivity and recording sensitivity of the recording layer.
• the transmittance of the first recording layer is about 50%. It is necessary to develop a material with high sensitivity and high reflectivity so that both the first recording layer and the second recording layer can be satisfactorily recorded with the same laser light source while securing%.
• a light-transmitting material layer a so-called spacer layer
• the first recording layer via a very thin transflective film
• the second recording layer is formed on the spacer layer. Since they are directly stacked, in an optical recording medium having a two-layer recording layer, ensuring storage reliability is a very big issue.
• the present invention provides good recording / reproduction characteristics and recording information in an optical recording medium having an organic dye as a recording layer, particularly an optical recording medium having a two-layer recording layer.
• the purpose is to ensure the reliability of storage.
• the first aspect of the present invention includes at least a first recording layer, a semi-transmissive reflective layer, a light-transmissive material layer, a second recording layer, and a reflective layer on a light-transmissive substrate.
• the optical recording medium in which the first and second recording layers contain an organic dye the general formula shown in the following chemical formula 1 (wherein R1 is carbon Represents an alkyl group having 1 to 4 carbon atoms, R2 and R3 each represent an alkyl group having 1 to 4 carbon atoms, a benzyl group, or a group that is linked to form a 3- to 6-membered ring, and Yl and ⁇ 2 are each independently Represents an organic group, X represents CIO, BF, PF, SbF
• an organic dye represented by the following chemical formula (wherein Rl and R4 represent an alkyl group having 1 to 4 carbon atoms, and R2 and R3 represent 1 to 4 carbon atoms, respectively).
• At least the following general formula 3 (wherein R1 and R2 represent an alkyl group having 1 to 4 carbon atoms, Yl and ⁇ 2 each independently represent an organic group, X represents CIO, BF, PF, SbF
• an organic dye represented by the following chemical formula (wherein Rl and R4 represent an alkyl group having 1 to 4 carbon atoms, and R2 and R3 represent 1 to 4 carbon atoms) Represents an alkyl group or a group formed by linking to form a 3- to 6-membered ring, Yl and ⁇ 2 each independently represent an organic group, and X represents CIO, BF, PF, S
• the second recording layer has at least the following chemical formula 3
• the organic dye represented by the general formula and the organic dye represented by the general formula shown in the following chemical formula 4 are used.
• a second aspect of the present invention is an optical recording medium comprising at least one recording layer containing an organic dye, and the recording layer includes at least an organic pixel represented by the general formula shown in Chemical Formula 3 above; The organic dye represented by the general formula shown in Chemical Formula 4 above is used.
• a method for manufacturing an optical recording medium includes: forming at least a first recording layer and a semi-transmissive reflective layer on a light-transmitting substrate on which a group is formed; A photocurable material layer is deposited on the transparent reflective layer, and the photocurable material is irradiated with light in a state where a stamper having a group pattern formed thereon is pressed on the photocurable material layer. The layer is cured to form a light transmissive material layer, the stamper is peeled off from the light transmissive material layer, and then at least a second recording layer and a reflective layer are laminated to produce an optical recording medium.
• So-called 2P (Photo-Polymerization) Method of manufacturing an optical recording medium wherein the first recording layer is represented by at least an organic dye represented by the general formula shown in Chemical Formula 1 and a general formula shown in Chemical Formula 2 above. Or a material having at least the organic dye represented by the general formula shown in Chemical Formula 3 and the organic dye represented by the general formula shown in Chemical Formula 4 in the first recording layer. Use a fee.
• a method for manufacturing an optical recording medium includes forming at least a first recording layer and a semi-transmissive reflective layer on a light-transmitting first substrate on which a group is formed. Then, at least a reflective layer and a second recording layer are stacked on the second substrate on which a group having a polarity opposite to that of the first substrate group is formed, and the light-transmitting material portion is sandwiched therebetween. V, a semi-transparent reflective layer on the first substrate and a second recording layer on the second substrate are joined to produce an optical recording medium.
• V light by the inverted inverted stack method
• the first recording layer has at least an organic dye represented by the general formula shown in Chemical Formula 1 and an organic dye represented by the general formula shown in Chemical Formula 2 above. Or at least the organic dye represented by the general formula shown in the chemical formula 3 and the general formula shown in the chemical formula 4 in the first recording layer.
• an organic dye represented by the general formula shown in the chemical formula 3 and an organic dye represented by the general formula shown in the chemical formula 4 are used in the second recording layer.
• An optical recording medium is manufactured using a material having the following.
• the first recording layer configured to have an organic dye represented by the general formula shown in Chemical Formula 1 and Chemical Formula 2 above? Or an organic dye represented by the general formulas shown in the above chemical formulas 3 and 4 in the second recording layer. It is set as the structure which has.
• an optical recording medium provided with at least one recording layer containing an organic dye
• a material containing an organic dye represented by the general formula shown in Chemical Formula 3 and Chemical Formula 4 in the recording layer Good recording / reproduction characteristics and storage reliability of recorded information can be ensured.
• optical recording medium and the method for producing the same of the present invention it is possible to ensure good recording / reproduction characteristics and storage reliability of recorded information in an optical recording medium having an organic dye as a recording layer. it can.
• the second recording layer is made of a material having an organic dye represented by the general formula shown in Chemical Formula 3 and Chemical Formula 4 above, whereby the second recording layer is formed. It is possible to ensure good recording / reproducing characteristics and recording information storage reliability in the layer.
• FIG. 1 is a schematic cross-sectional configuration diagram of an optical recording medium according to an embodiment of the present invention.
• FIGS. 2A to 2C are schematic manufacturing process diagrams of an optical recording medium manufacturing method according to an embodiment of the present invention.
• FIG. 3 is a manufacturing process diagram of an optical recording medium manufacturing method according to an embodiment of the present invention.
• FIG. 4 is a schematic cross-sectional configuration diagram of a main part of an optical recording medium according to an embodiment of the present invention.
• FIG. 5 is a schematic cross-sectional configuration diagram of a substantial part of an optical recording medium according to an embodiment of the present invention.
• FIG. 6 is a schematic cross-sectional configuration diagram of a substantial part of an optical recording medium according to an embodiment of the present invention.
• FIG. 7 is a diagram showing the results of studying the durability of optical recording media according to an embodiment and a comparative example of the present invention.
• FIG. 8 is a diagram showing a relationship between group depth and jitter of an optical recording medium according to an embodiment of the present invention.
• FIG. 9 shows a relationship between group width and jitter of an optical recording medium according to an embodiment of the present invention.
• FIG. 10 is a graph showing the relationship between the weight ratio of the recording layer material of the optical recording medium according to the embodiment of the present invention and the recording sensitivity.
• FIG. 11 is a diagram showing the relationship between the weight ratio of the quenching agent in the recording layer of the optical recording medium according to the embodiment of the present invention and the jitter change.
• FIG. 12 is a diagram showing the relationship between the weight ratio of the phthalocyanine dye in the recording layer of the optical recording medium according to the embodiment of the present invention and the jitter change.
• FIG. 13 is a diagram showing the relationship between the optical density of the recording layer of the optical recording medium according to the embodiment of the present invention and jitter.
• FIG. 14 is a diagram showing the relationship between the film thickness of a transflective layer and the reflectance of an optical recording medium according to an embodiment of the present invention.
• FIG. 15 is a schematic sectional view of an optical recording medium according to an embodiment of the present invention.
• FIGS. 16A to 16C are schematic manufacturing process diagrams of an optical recording medium manufacturing method according to an embodiment of the present invention.
• FIG. 17 is a manufacturing process diagram of a method for manufacturing an optical recording medium according to an embodiment of the present invention.
• FIG. 18 is a schematic cross-sectional configuration diagram of the main part of an optical recording medium according to an embodiment of the present invention.
• FIG. 19 is a schematic cross-sectional configuration diagram of a substantial part of an optical recording medium according to an embodiment of the present invention.
• FIG. 20 is a diagram showing the relationship between the group width and jitter of the optical recording medium according to the embodiment of the present invention.
• FIG. 21 is a view showing the relationship between the optical density of the recording layer of the optical recording medium according to the embodiment of the present invention and jitter.
• the present invention relates to, for example, a disk-type optical recording medium having a recording layer made of an organic dye.
• the recording layer is compatible with single-layer DVD-R and DVD + R.
• DVD—R DL and DVD formed by the method or the inverted stack method Provide an optical recording medium capable of high-speed recording and high data storage reliability in + R DL (recordable DVD, registered trademark with two recording layers).
• FIG. 1 shows a schematic sectional configuration diagram of an embodiment in which the present invention is applied to an optical recording medium by the 2P method.
• a light-transmitting substrate 1 made of PC (polycarbonate) or the like
• a first recording layer 2 containing at least an organic dye
• a semi-transmissive reflective layer 3 made of a silver alloy, or the like
• a light-transmitting material layer 4 made of cured resin or the like
• a second recording layer 6 containing an organic dye, and a reflective layer 7 made of a silver alloy or the like are laminated.
• the protective layer 8 is provided on the reflective layer 7.
• Such an optical recording medium is irradiated with the recording or reproduction light L from the substrate 1 side to perform recording or reproduction.
• the light transmissive material layer 4 may be any material that transmits light in the wavelength band for recording and reproduction with a required transmittance, such as a dielectric layer and a UV curable resin. It is good also as a laminated structure. Therefore, the dielectric layer having light transmittance in the required wavelength band is arranged between the semi-transmissive reflective layer 3 and the light transmissive material layer 4 and between the Z or light transmissive material layer 4 and the second recording layer. It is also possible to intervene between them! When the dielectric layer is interposed between the recording layer and the light transmissive material layer in this way, it is possible to suppress the influence of the light transmissive material layer on the recording layer and improve durability. is there.
• optical recording medium manufacturing method One embodiment of this optical recording medium manufacturing method will be described with reference to the manufacturing process diagrams of FIGS. 2A to 2C and FIGS. 3A and 3B.
• a light transmissive substrate 1 having a group 1G having a predetermined track pitch and depth and made of PC or the like is prepared.
• the substrate 1 is manufactured by, for example, injection molding.
• the first recording layer 2 is applied by spin coating or the like, and the transflective layer 3 is further laminated by sputtering.
• a light transmissive material layer 4 such as UV curable resin is applied on the transflective layer 3 by a spin coating method or the like.
• This state sand
• the light transmissive material layer 4 is cured by irradiating with ultraviolet rays.
• a group 4G having a predetermined track pitch and depth is formed in one layer of the light transmissive material layer 4 and the so-called spacer.
• the stamper 5 is peeled off, and as shown in FIG. 3B, the second recording layer 6 is applied by a spin coating method or the like, and further a reflective layer 7 is formed by a sputtering method, and a UV curable resin is formed thereon.
• An optical recording medium manufactured by the 2P method can be obtained by forming the protective layer 8 by, for example, adhering a light-transmitting substrate via the like.
• a substrate made of PC having a thickness of 575 mm is prepared as the substrate 1, and a first recording layer 2 of the material described later is formed thereon, and a silver alloy is formed thereon by sputtering.
• the semi-transmissive reflective layer 3 was laminated.
• a so-called spacer layer a UV-cured resin was applied by spin coating to 50 m, and a group having a polarity opposite to that of the substrate 1 double 1G was previously formed.
• a light-transmitting material layer 4 was obtained by pressing a stamper 5 made of Zeonor manufactured by Zeon Co., Ltd. and irradiating with UV to cure the UV-cured resin.
• a second recording layer 6 made of a material described later was formed by spin coating, and a silver reflective film 7 was laminated thereon by sputtering.
• a protective substrate 8 is formed by attaching a transparent substrate having a thickness of 0.6 mm through a UV-curing resin, thereby producing an optical recording medium having the configuration of the present invention. did.
• a single recording layer in which a recording layer 32 containing an organic dye, a reflective layer 33, and a protective layer 34 are formed on a substrate 31 is provided.
• a layer-type optical recording medium was also produced.
• the coating liquid used in the coating process of the first and second recording layers 2 and 6 in the optical recording medium having the recording layer two-layer structure and the recording layer 32 in the optical recording medium having the single-layer structure is as follows. What dissolved the organic pigment
• TFP tetrafluoro propanol
• As an organic dye used for the material of the recording layer among the general formulas shown in the above-mentioned chemical formula 1, as an example, a dye having the structural formula shown in the chemical formula 5 below, and as an example of the general formula shown in the above chemical formula 2, A dye having the structural formula shown in FIG.
• the substrates 1 and 31 used have the shape shown in the schematic cross-sectional configuration diagram of FIG. 5.
• the track pitch T p force SO. 74 i um, the groove depth D (L0) and the width Wg (L0 ) was 160 nm and 220 nm, respectively.
• the groove width Wg (LO) of the group is defined as the width of the bottom of the groove portion with the inclined side surface.
• the group 4G for the second recording layer 6 formed on the light transmissive material layer 4 in the optical recording medium having the recording layer two-layer configuration has the shape shown in the schematic cross-sectional configuration diagram of FIG.
• the track pitch Tp is 0.74 m
• the groove depth D (L1) and width Wg (Ll) of group 4G are 160 nm and 220 nm, respectively.
• the groove width Wg (L 1) of the group 4G is defined as the width of the bottom of the groove portion with the inclined side surface.
• ODU-1000 (trade name) manufactured by Pulstec Industrial Co., Ltd. was used for signal recording and reproduction.
• the wavelength of the laser beam of this evaluator is 650 nm, and the numerical aperture NA of the condenser lens is 0.65.
• the EFM plus signal is randomly recorded and the jitter value of the reproduced signal is measured.
• the recording conditions are as follows: Pulse rate based on DVD + R (recording layer single layer) and DVD + R DL (recording layer two layers) recording method standards.
• the jitter value represents the variation in the time axis of the recorded mark and space during playback, it is an indicator of the accuracy of the recorded mark and space. The smaller the jitter value, the higher the signal quality. To do. Tables 1 and 2 below show the jitter values at 2.times. Speed and 8.times. Speed recording at the optimum recording power.
• the weight of the organic dye shown in Chemical Formula 1 above that is, the organic dye shown in Chemical Formula 5 in this example is Wl
• the organic dye shown in Chemical Formula 2 that is, the organic dye shown in Chemical Example 6 in this example.
• the weight of the organic dye shown in the above chemical formula 3 that is, the organic dye shown in the chemical formula 7 in this example is W3
• the organic dye shown in the chemical formula 4 in this example that is, the organic dye shown in the chemical formula 8 in this example.
• the weight of the dye was W4
• the weight of the deactivator was W5
• the weight of the phthalocyanine dye was W6
• the weight ratio of each material in each recording layer was prepared under the following conditions.
• the recording layer in the optical recording medium having a single-layer recording layer has the weight ratio W4Z (W3 + W4) of the weights of organic dyes W3 and W4 shown in Chemical Formula 7 and Chemical Formula 8 above, and
• the weight ratio W5Z (W3 + W4 + W5) of the weight W5 and the weight ratio W6Z (W3 + W4 + W5 + W6) of the phthalocyanine dye weight W6 were selected as follows.
• optical recording media having the following two types of material structures were produced. These are shown as an optical recording medium (1) and an optical recording medium (2).
• the first recording layer (1) is an organic dye represented by the above chemical formulas 5 and 6.
• Weight Wl, W2 weight ratio W2Z (W1 + W2), quencher weight W5 weight ratio W5 / (W3 + W4 + W5), phthalocyanine dye weight W6 weight ratio W6Z (W3 + W 4 + W5 + W6) was selected and configured as follows.
• the first recording layer (2) of the optical recording medium (2) has a weight ratio W4Z (W3 + W4) of the weights of the organic dyes W3 and W4 shown in the chemical formulas 7 and 8 and is deactivated.
• the weight ratio W5Z (W3 + W4 + W5) of the agent and the weight ratio W6Z (W3 + W4 + W5 + W6) of the phthalocyanine dye weight W6 were selected as follows.
• the second recording layer (1) of the optical recording medium (1) has a weight ratio W2Z (W1 + W2) of the organic dye weight Wl and W2 shown in the chemical formulas 5 and 6 and is deactivated.
• the weight ratio W5Z (W3 + W4 + W5) of the agent and the weight ratio W6Z (W3 + W4 + W5 + W6) of the phthalocyanine dye weight W6 were selected as follows.
• the second recording layer (2) of the optical recording medium (2) has a weight ratio W4Z (W3 + W4) of the weights of the organic dyes W3 and W4 shown in Chemical Formula 7 and Chemical Formula 8 above, and is deactivated.
• the weight ratio W5Z (W3 + W4 + W5) of the agent and the weight ratio W6Z (W3 + W4 + W5 + W6) of the phthalocyanine dye weight W6 were selected as follows.
• the upper limit of jitter at the optimum recording power is 9%. It can be seen that it has very good jitter characteristics from low-speed recording to high-speed recording.
• Fig. 7 shows the results of an accelerated test to confirm the storage reliability of recorded information.
• the test conditions were a temperature of 70 ° C. and a humidity of 85%.
• a phthalocyanine dye and an organic dye represented by the structural formulas shown in Chemical Formula 5 and Chemical Formula 6 above were used for the first recording layer and the second recording layer, respectively.
• Two types of samples were prepared: a mixed film to which a quenching agent was added, and a mixed film in which a phthalocyanine dye and a deactivator were added to the organic dye represented by the structural formulas shown in Chemical Formulas 7 and 8 above.
• a durability test was conducted.
• the second recording layer containing the material represented by the structural formulas shown in the chemical formulas 5 and 6 deteriorated such that the jitter exceeded 12% in 150 hours, but good jitter up to 400 hours in other cases. I confirmed that I kept it. Therefore, the first recording layer contains an organic dye represented by the general formula shown in Chemical Formula 1 and Chemical Formula 2 above. Or a material containing an organic dye represented by the general formula shown in Chemical Formula 3 and Chemical Formula 4 above, and the second recording layer may be represented by Chemical Formula 3 and Chemical Formula 4 above. It can be seen that an optical recording medium excellent in storage reliability of recorded information can be obtained by forming a recording layer containing an organic dye represented by the general formula shown in FIG.
• FIG. 8 shows the result of studying the groove depths D (L0) and D (L1) of each group of the first and second recording layers in the recording layer two-layer type optical recording medium.
• Figure 9 shows the results of plotting the jitter value at the optimum recording power for each width under the recording conditions of 2.4 ⁇ speed recording. From Fig. 9, the conditions of the group widths Wg (LO) and Wg (Ll) that give a jitter of less than 9% are
• D (L1) 160 nm for the second recording layer
• Wg (LI) 220 nm for the second recording layer.
• the mixing ratio of W4 was examined. Since these compounding ratios mainly depend on the recording sensitivity, the recording sensitivity Po (2.4X) at 2.4 times speed recording with respect to the compounding ratio was evaluated. The result is shown in FIG.
• the recording sensitivity varies depending on the blending ratio of the organic dyes shown in Chemical Formulas 1 to 4 above. However, if the sensitivity is too high, there is a risk of data deterioration due to the reproduction power during reproduction. Therefore, it is desirable that the lower limit of recording sensitivity is 20 mW or more. Also, DVD + R DL standard Therefore, since the upper limit of recording sensitivity is 30 mW, the preferred range of recording sensitivity is
• the blending ratio satisfying this condition is
• Figure 11 shows the amount of jitter change before and after the light resistance test when IRG022 manufactured by Nippon Gaiyaku Co., Ltd. was used as the quenching agent.
• the first recording layer is made of a material containing organic dyes represented by the general formulas shown in the above chemical formulas 1 and 2 (the weight of each organic dye is Wl and W2)
• the second recording layer is made of Materials containing organic dyes represented by the general formulas shown in the above chemical formulas 3 and 4 (The weight of each organic dye is W3 and W4.
• the light resistance test was carried out by irradiating the Xenon lamp on the recording surface side of the optical recording medium up to the blue scale (JIS standard) grade 5 fading at Sun Test CPS + manufactured by ATLAS.
• the amount of change in jitter before and after lamp irradiation with respect to the added amount of the quenching agent decreases to about 2-3% when the added amount is 0.05 or more. Therefore, the addition amount of the deactivator is the same for both the first recording layer and the second recording layer.
• the optical recording medium used in the following examination is widely used as a recording film material for CD-R that supports high-speed recording, and Ultra Green MX (trade name) manufactured by Ruchiba Specialty Chemicals Co., Ltd. is used. Using.
• the blending ratio of the recording film material is as follows: the first recording layer is a material containing organic dyes represented by the general formulas shown in the above chemical formulas 1 and 2 (the weight of each organic dye is Wl and W2), the second The recording layer is made of a material containing organic dyes represented by the general formulas shown in the above chemical formulas 3 and 4 (the weight of each organic dye is W3 and W4), and the composition ratio thereof is
• the weight of the deactivator is W5
• the second recording layer -C «W5 / (W3 + As W4 + W5) 0.13
• an optical recording medium prepared by adding Ultra Green MX (trade name) as a phthalocyanine dye and changing the weight ratio thereof was prepared. Even in this case, the light resistance test was performed by irradiating the Xenon lamp on the recording surface side of the optical recording medium up to the 5th grade fading equivalent to ATLAS Suntest CPS +! /, Blue Scale CFIS Standard). went. As a result, as shown in FIG.
• the jitter change can be suppressed to 2% or less by adding 0.01 or more by weight of the phthalocyanine dye. Therefore, the amount of phthalocyanine dye added is the same in both the first recording layer and the second recording layer.
• the weight ratio of the dye material relatively decreases, so that the jitter bottom value increases and the modulation degree tends to decrease.
• the addition amount of the phthalocyanine dye should be as small as possible, so the weight ratio of the phthalocyanine dye is
• the optical density (OD) corresponding to the film thickness of the recording layer was examined.
• the first recording layer is made of a material containing organic dyes represented by the general formulas shown in the above chemical formulas 1 and 2 (the weight of each organic dye is Wl and W2)
• the second recording layer Are materials containing organic dyes represented by the general formulas shown in the above chemical formulas 3 and 4 (the weights of the organic dyes are W3 and W4), respectively.
• IRG022 weight is W5
• Ultra Green MX (trade name) (weight is W6) manufactured by Specialty Chemicals Co., Ltd. was added.
• the composition ratios of the above materials are the same for the first recording layer.
• the optical density OD of each of the first recording layer and the second recording layer was changed in the range of 0.3 to 0.75, and the jitter bottom value at the time of quadruple speed recording was measured. The result is shown in FIG. From Fig. 13, if the optical densities OD of the first recording layer and the second recording layer are OD (L0) and OD (L1), respectively,
• the optical density OD (LO) of the first recording layer is set to
• the optical densities OD (L0), OD ( Ll) was both set to 0.50, and the change in reflectance with respect to the change in film thickness of the transflective film was measured.
• Recording layer In a two-layer type optical recording medium, the first recording layer is required to be compatible with both recording and transmission, so it is a very thin film. Therefore, a pure Ag film having a large particle system during film formation cannot protect the dye film during the formation of a single spacer layer. Therefore, in the present invention, the material of the semitransparent reflective film is an Ag having a small particle diameter. It is necessary to use an alloy.
• the transflective film Since the reflectance is most affected by the film thickness of the transflective film, the change in the reflectance of each of the first recording layer and the second recording layer with respect to the film thickness was evaluated. The results are shown in FIG. Since the reflectivity to be satisfied by the DV D + R DL standard is 16% or more, the transflective film is made of an Ag alloy, and its film thickness T is
• the DVD standard is satisfied. Therefore, signal characteristics that satisfy the recordable single-layer DVD and write-once dual-layer DVD standards can be obtained over a wide range of recording speeds from 1x to 8x, and the V Thus, it is possible to provide a practical optical recording medium that has no problem in the storage durability of recorded information.
• the present invention is applied to an optical recording medium manufactured by the inverted stack method. An example will be described.
• FIG. 15 shows a schematic cross-sectional configuration diagram of an embodiment in which the present invention is applied to an optical recording medium based on the inverted stack method.
• a light transmissive first substrate 11 made of PC (polycarbonate) or the like
• UV ( A light-transmitting material portion 25 made of ultraviolet (cured) resin, an insulator layer 24, a second recording layer 23 containing an organic dye, a reflective layer 22 made of a silver alloy, etc., and a second substrate 21 are laminated.
• the configuration is made.
• Such an optical recording medium is irradiated with light L for recording or reproducing on the side of the substrate 11 to perform recording or reproduction.
• the light transmissive material portion 25 may be any material that transmits light in the wavelength band for recording and reproduction with a required transmittance.
• a dielectric layer and a UV curable resin are laminated. It is good also as a structure.
• a dielectric layer having the required light transmittance may be interposed between the semi-transmissive reflective layer 3 and the light-transmissive material portion 25, or as described later, the second recording layer 24 The dielectric layer 24 may not be interposed between the light transmitting material portion 25 and the light transmitting material portion 25.
• a light-transmitting first substrate 11 having a group 11G having a predetermined track pitch and depth and made of PC or the like is prepared.
• the first substrate 11 is manufactured by, for example, injection molding.
• the first recording layer 12 is applied by spin coating or the like, and the transflective layer 13 is further laminated by sputtering.
• a second substrate 21 separate from the first substrate 11 is prepared.
• a group 21G having a polarity opposite to that of the group 11G formed on the first substrate 11 is formed in advance by injection molding or the like.
• a reflective layer 22 is formed on the second substrate 21 by a sputtering method, a second recording layer 23 is formed thereon by a spin coating method or the like, and a dielectric layer 24 is further formed thereon as a protective layer.
• the reflective layer 22 is first formed on the group 21G by a physical film formation method such as sputtering, so that the reflective layer 22 has the uneven shape of the group 21G.
• the second recording layer is made of a liquid material containing an organic dye
• the reflective layer is formed after the second recording layer is formed by coating or the like.
• the reflective layer is formed with a gentler shape than the concavo-convex shape of the group, like the second recording layer.
• the substrates 11 and 21 on which the first and second recording layers 12 and 23 are formed respectively are dielectric layers on the transflective layer 13 and the second recording layer 23.
• Each substrate is bonded as shown by arrows b and c through a light-transmitting material part 25 such as UV-cured resin while facing the body layer 24. 25 is cured, the first and second substrates 11 and 21 are fixed, and as shown in FIG. 17, an optical recording medium having a two-layered recording layer structure can be manufactured by the inverted stack method. .
• the first substrate 11 side force recording or reproduction light Li is incident to perform recording or reproduction.
• the light transmissive material portion 25 is a so-called spacer layer.
• the dielectric layer 24 is provided so that the second recording layer 23 is not mixed with the liquid UV resin or the like when, for example, a UV resin is used as the light transmissive material portion 25.
• a UV resin is used as the light transmissive material portion 25.
• a sheet-like UV curable resin is used as the light transmissive material portion 25
• an optical recording medium can be obtained by joining the transflective layer 13 and the second recording layer 23 facing each other via a solid light transmissive material portion 25 such as a sheet. it can.
• a substrate made of PC having a thickness of 575 mm is prepared as the first substrate 11, and a first recording layer 12 of a material described later is formed thereon, and a sputtering method is formed thereon.
• a semi-transmissive reflective layer 13 made of a silver alloy was laminated.
• a reflective layer made of an Ag alloy is formed by a notching method.
• a second recording layer made of the material described later is applied by spin coating, and then sputtered as a protective film.
• a dielectric layer made of a ZnS-based material was laminated to a thickness of 10 nm. Thereafter, the first and second substrates 11 and 21 are cured and bonded by, for example, UV irradiation through a light-transmitting material portion having a thickness of 50 m, a so-called spacer layer, and optical recording is performed. A medium was produced.
• the coating solution used in the coating process of the first and second recording layers 12 and 23 described above was prepared by dissolving an organic dye in tetrafluoropropanol (TFP) serving as a coating solvent.
• the organic dye used for the recording layer material include the dye having the structural formula shown in Chemical Formula 5 as an example of the general formula shown in Chemical Formula 1 and the chemical formula shown in Chemical Formula 6 as an example of the general formula shown in Chemical Formula 2 above.
• the general formula shown in Chemical Formula 3 the general formula shown in Chemical Formula 3
• the structural formula shown in Chemical Formula 7 as an example
• Chemical Formula 4 the structural formula shown in Chemical Formula 8 as an example.
• Each dye was used.
• IRG022 (trade name) manufactured by Nippon Gaiyaku Co., Ltd. is used as the quenching agent, and as a phthalocyanine dye, it is widely used as a recording film for CD-R for high-speed recording.
• 'Ultra Green MX (trade name) manufactured by Specialty Chemicals Co., Ltd. was used.
• the first substrate 11 used has the shape shown in the schematic cross-sectional configuration diagram of Fig. 18.
• the track pitch ⁇ is 0.74 ⁇ m
• the groove depth D (L0) and the width Wg of the group 11G. (L0) was 16 Onm and 220 nm, respectively.
• the groove width Wg (L0) of the group is defined as the width of the bottom of the groove with the inclined side surface.
• the group 21G for the second recording layer 23 formed on the second substrate 21 has the shape shown in the schematic cross-sectional configuration diagram of FIG. 19, and as an example, the track pitch Tp is 0.74 m,
• the groove depth D (L1) and width Wg (L1) of Group 21G were 25 nm and 370 nm, respectively.
• the width Wg (Ll) of the group 21G serving as the recording track is the upper side of the convex portion. It is defined as the width of.
• the depth of the group 21G provided on the second substrate 21 is selected to be shallower than the group 11G provided on the first substrate 11.
• the second substrate 21 is turned upside down as described above, and the first substrate The recording track becomes the convex part of the group 21G for joining on the top. For this reason, when a liquid organic dye material is formed on the group 21 G by coating or the like, the thickness of the organic dye material at the convex portion cannot be secured unless the group depth is relatively shallow. Recording / playback characteristics cannot be obtained.
• group depth of group 21G is selected to be about 25 nm as an example.
• ODU-1000 manufactured by Pulstec Industrial Co., Ltd. was used for recording and reproducing signals on the optical recording medium having the above-described configuration.
• the evaluator had a laser beam wavelength of 650 nm and NA of 0.65.
• the EFM plus signal used in DVDs was recorded randomly, and the jitter value of the reproduced signal was measured.
• the recording conditions were set to 2.4x speed recording (linear speed 9.2mZs) using DVD + R DL Pulse Strategy, and the jitter value with respect to the recording power when reading at 1x speed was measured.
• the second recording layer was recorded after recording on the first recording layer.
• the jitter value represents the variation in the time axis of the recorded mark and space during playback, it becomes an index indicating the accuracy of the recorded mark and space, and the smaller the jitter value, the higher the signal quality.
• Table 3 below shows the jitter value at 2.4x recording at the optimum recording power.
• the weight of the organic dye shown in Chemical Formula 1, that is, in this example, the organic dye shown in Chemical Formula 5, is W1
• the organic dye shown in Chemical Formula 2 that is, the organic formula shown in Chemical Example 6 in this example
• the weight of the dye is W2
• the organic dye shown in the above chemical formula 3 ie in this example, the weight of the organic dye shown in the above chemical formula 7 is W3
• the organic dye shown in the above chemical formula 4 is shown in the chemical formula 8 in this example.
• the weight of the organic dye is W4
• the weight of the deactivator is W5
• the weight of the phthalocyanine dye is W6
• the weight ratio of each material in each recording layer is as follows. It produced as conditions.
• the first recording layer 12 has a weight ratio of the above materials.
• the second recording layer has a weight ratio of the above materials.
• the upper limit of jitter at the optimum recording power is 9%, so that both the first and second recording layers of the optical recording medium according to the present embodiment are added to the two layers.
• Type DVD media has very good jitter characteristics
• the force that requires the groove depth of the second substrate to be relatively shallow is relatively shallow.
• the jitter is 20%, and the recording layer film thickness at the convex portion on the second substrate to be the recording track is ensured. It can be seen that practical recording / reproduction characteristics cannot be obtained.
• the group width Wg (Ll) of the second recording layer was examined.
• the second recording layer group width Wg ( Ll) was examined.
• the recording conditions were 2.4x speed recording, and the jitter value at the optimum recording power was plotted against each width. The results are shown in FIG. From Figure 20, the condition of the group width Wg (Ll) that gives a jitter of less than 9% is
• the optical density (OD) corresponding to the film thickness of the recording film was examined.
• the mixing ratio of the dyes in the first recording layer and the second recording layer is the same as that described in Table 3 above, and the optical density OD (Ll) of the second recording layer is as follows.
• the results are shown in FIG. From Figure 21, the range of optical density OD (L1) that gives a jitter of less than 9% is
• the speed is 1 to 8 times according to the DVD standard. It can be seen that the signal characteristics satisfying the standards of write once single layer DVD and write once double layer DVD can be obtained over a wide range of recording speeds. In this case, it was also confirmed that the recording information storage durability could be ensured in the second recording layer, as in the optical recording medium manufactured by the 2P method.
• the optical recording medium according to the present invention is not limited to the above examples, and the optical recording medium having the recording layer according to the present invention having a single layer conforms to the DVD + R type standard or The same effect can be obtained when the present invention is applied to an optical recording medium substantially conforming to or an optical recording medium conforming to or substantially conforming to the DVD-R type standard.
• the optical recording medium of the present invention having two recording layers is an optical recording medium conforming to or substantially conforming to the DVD + R DL type standard, or an optical recording medium conforming to or substantially conforming to the DVD-R DL type standard. The same effect can be obtained when applied to a recording medium.
• DVD + R and DVD + R DL recording and playback The optical wavelength of 655nm + lOnmZ—5nm means that the tolerance is + lOnm and 5nm. Similarly, the recording wavelength of DVD-R and DVD-R DL is 650nm + lOnmZ—
• 5nm means a tolerance of + 10nm and 5nm.
• optical recording medium and the manufacturing method thereof according to the present invention are not limited to the optical recording medium described in each of the above-described embodiments.
• materials other than the recording layer such as a substrate, a protective layer, and a dielectric layer
• optical recording medium and the method for producing the same of the present invention it is possible to ensure good recording / reproduction characteristics and storage reliability of recorded information in an optical recording medium having an organic dye as a recording layer. it can.
• the second recording layer is made of a material having an organic dye represented by the general formula shown in Chemical Formula 3 and Chemical Formula 4 above, whereby the second recording layer is formed. It is possible to ensure good recording / reproducing characteristics and recording information storage reliability in the layer.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Optical Record Carriers And Manufacture Thereof (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38309298

Family Applications (1)

Country Status (7)

Families Citing this family (1)

Citations (5)

Family Cites Families (13)

• 2006
  • 2006-01-27 JP JP2006019782A patent/JP4953645B2/ja not_active Expired - Fee Related
• 2007
  • 2007-01-26 TW TW096103061A patent/TWI417345B/zh not_active IP Right Cessation
  • 2007-01-26 CN CNA2007800005060A patent/CN101321631A/zh active Pending
  • 2007-01-26 KR KR1020077023686A patent/KR20080090960A/ko not_active Ceased
  • 2007-01-26 US US11/909,781 patent/US8105750B2/en not_active Expired - Fee Related
  • 2007-01-26 WO PCT/JP2007/051277 patent/WO2007086512A1/ja not_active Ceased
  • 2007-01-26 EP EP07707509A patent/EP1977902A4/en not_active Withdrawn

Patent Citations (5)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events