Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
  • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
  • B29C43/20—Making multilayered or multicoloured articles
  • B29C43/203—Making multilayered articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/50—Removing moulded articles
• • 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
  • G11B7/2463—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 azulene
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
  • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
  • B29C2043/023—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves
  • B29C2043/025—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves forming a microstructure, i.e. fine patterning
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
  • B29C43/32—Component parts, details or accessories; Auxiliary operations
  • B29C43/50—Removing moulded articles
  • B29C2043/5053—Removing moulded articles using pressurised gas, e.g. air
• • 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

Definitions

• the present invention relates to a method for manufacturing an optical recording medium, and more particularly, to a method for manufacturing an optical recording medium with improved production efficiency.
• an optical recording medium capable of further increasing the density of information as compared with the related art.
• an optical recording medium capable of increasing the density of such information for example, a DVD-ROM having a laminated structure in which two recording layers are provided on one medium (dual layer) and the like are given.
• Such a laminated multilayer optical recording medium is usually manufactured by a manufacturing method called a photopolymerization method (hereinafter sometimes referred to as "2P method").
• 2P method for example, a first recording layer, a first reflective layer, an intermediate layer having recording track irregularities formed on a transparent first substrate having recording track irregularities formed thereon, and a second recording layer.
• a second reflective layer is formed in this order, and finally, the second substrate is bonded to manufacture an optical recording medium having a two-layer structure.
• the intermediate layer is usually manufactured as follows. That is, first, a photocurable resin material or the like is applied on the first reflective layer, and then a light-transmitting stamper having irregularities is placed thereon. Next, after the photocurable resin raw material and the like are cured, the stamper is peeled off. In this way, the unevenness is transferred to the surface of the photocurable resin to form the intermediate layer. For this reason, in the 2P method, it is necessary to smoothly peel off the stamper after curing the photocurable resin.
• the stamper when forming an intermediate layer having irregularities for a recording track by the 2P method, the stamper is cured while the stamper is in close contact with the photocurable resin of the intermediate layer, or the photocurable resin and the stamper are separated. If there is a problem in manufacturing such as difficulty in peeling or a decrease in the uniformity of the surface of the intermediate layer even after peeling, stable recording of optical information on the optical recording medium is possible. • Playback cannot be performed.
• a transparent inorganic material such as SiO is coated on the stamper side in advance so that the photocurable resin and the stamper can be easily separated from each other.
• Patent Document 1 There has been proposed a method of performing the above-mentioned (see Patent Document 1).
• Patent Document 1 Japanese Patent Application Laid-Open No. 2002-279707 (see paragraph (0026), etc.)
• the present invention has been made to solve a technical problem that has been highlighted when manufacturing a laminated multilayer optical recording medium by such a 2P method.
• an object of the present invention is to provide a method of manufacturing a laminated multilayer optical recording medium with improved manufacturing efficiency.
• Another object of the present invention is to provide a light transmissive stamper used when manufacturing a laminated multilayer optical recording medium by the 2P method.
• the present invention uses a light-transmitting stamper made of a non-polar member in a method for manufacturing an optical recording medium by the 2P method. That is, the method for manufacturing an optical recording medium to which the present invention is applied includes a step of forming, on a substrate, directly or via another layer, a recording layer on which information is recorded by irradiated light. Forming a resin material layer directly or via another layer on the recording layer, and a non-polar member member having an uneven shape on the formed resin material layer. Removing the light-transmitting stamper after placing the light-transmitting stamper, and transferring the uneven shape to the resin material layer to form an intermediate layer.
• the non-polar member is formed by Is a polymer material having no polar group. This makes it possible to easily separate the resin layer and the light-transmitting stamper formed from the ultraviolet-curable resin or the like of the optical recording medium without exerting an excessive load. As a result, deformation of the recording layer and the like is prevented, and a signal waveform for recording and reproducing optical information can be stabilized. Further, since the residue of the ultraviolet-curable resin is unlikely to adhere to the light-transmitting stamper side, the light-transmitting stamper can be reused.
• the non-polar member is preferably a polyolefin, and among the polyolefins, a crystalline polyolefin is preferable. And, among crystalline polyolefins, polypropylene is preferable. With the above materials, the effects of the present invention can be effectively exhibited.
• the light-transmitting stamper is a non-polar polymer material having a melt flow rate (MFR) of 20 gZl0 min. Or more in a molten state. Is preferred.
• MFR melt flow rate
• the light-transmitting stamper can be easily formed by the injection molding method or the like.
• the outer diameter of the light transmitting stamper is preferably larger than the outer diameter of the substrate in a range of lmm or more and 15mm or less! /.
• the optically transparent stamper may be formed on the above-mentioned recording layer directly or via another layer on the surface having irregularities. Another resin raw material layer different from the formed resin raw material layer is formed, and this resin raw material layer and the resin raw material layer formed on the recording layer directly or via another layer face each other. Preferably, a light transmissive stamper is mounted.
• Employing the above manufacturing method makes it easier to remove the edge glue that may occur during the manufacturing of the intermediate layer.
• an intermediate layer having a favorable end face shape is easily obtained.
• the resin material layer is made of a radiation-curable resin.
• Light transmission through the use of radiation-curable resin The uneven shape of the conductive stamper can be easily transferred.
• the intermediate layer portion existing outside the outer diameter of the substrate is removed. It is preferable to remove them. By removing the intermediate layer, the shape of the end of the intermediate layer can be improved. Then, it is preferable that the intermediate layer portion existing outside the outer diameter of the substrate is removed by irradiating the laser light. This is because the accuracy of the shape of the end portion of the intermediate layer can be further improved by using laser light.
• a knife edge is inserted between the substrate and the light-transmitting stamper to peel off the light-transmitting stamper.
• the substrate and the light-transmitting stamper have a planar annular shape, it is preferable to insert the knife edge into the inner diameter side force of the substrate and the light-transmitting stamper.
• the thickness of the light-transmitting stamper is reduced at a portion where the knife edge is inserted. By doing so, the insertion of the knife edge becomes easy.
• the present invention relates to a light-transmitting stamper used in a method for manufacturing an optical recording medium having a step of forming an intermediate layer by a photopolymerization method, wherein the light-transmitting stamper is provided.
• a light-transmitting stamper characterized by being formed from a non-polar member having a transmittance of light of 300 nm to 400 nm of 10% or more.
• the thickness force of the light transmissive stamper is preferably 0.3 mm to 5 mm. When the thickness of the light-transmitting stamper is within the above range, it is possible to efficiently cure UV-curable resin and the like, and improve productivity.
• the outer diameter of the light-transmitting stamper is preferably larger than the outer diameter of the optical recording medium.
• the outer diameter of the light-transmitting stamper should be If it is made large, even if end burrs are generated during the production of the intermediate layer, it becomes easy to remove them.
• the manufacturing efficiency of the laminated multilayer optical recording medium by the 2P method is improved.
• FIG. 1 is a diagram for explaining a method of manufacturing an optical recording medium to which the present embodiment is applied.
• FIG. 2 is a graph showing the measurement results of the light transmittance of a polypropylene light-transmitting stamper at wavelengths of 200 nm to 500 nm.
• FIG. 3 is a view showing an example of mounting and peeling of a light transmitting stamper.
• FIG. 4 is a view showing another example of mounting and peeling of the light transmitting stamper.
• FIG. 5 is a view showing still another example of mounting and peeling of the light transmitting stamper.
• FIG. 6 is a view showing an example of laser trimming and peeling of a light transmitting stamper.
• FIG. 7 is a view showing another example of laser trimming and peeling of the light transmitting stamper.
• FIG. 8 is a perspective view and a cross-sectional view illustrating an example of a state where a light transmitting stamper is mounted.
• FIG. 9 is a view for explaining an example of a method of separating the light transmitting stamper from the data substrate.
• FIG. 10 is a view for explaining another example of a method for separating the light transmitting stamper from the data substrate.
• FIG. 1 is a diagram for explaining a preferred example of a method for manufacturing an optical recording medium to which the present embodiment is applied.
• FIG. 1 shows a dual-layer single-sided optical recording medium (single-sided dual-layer DVD-R or single-sided dual-layer type optical recording medium having two recording layers containing an organic dye) as an example of a method of manufacturing a laminated multilayer optical recording medium. It shows the method of manufacturing a double-layer DVD recordable 'disc).
• the single-sided, double-layer optical recording medium 100 represented by the single-sided, dual-layer DVD-R shown in FIG. 1 (f) comprises a disc-shaped light-transmitting first substrate 101, and the first substrate 101
• a second reflective layer 106, an adhesive layer 107, and a second substrate 108 forming the outermost layer are sequentially laminated.
• Irregularities are formed on the first substrate 101 and the intermediate layer 104, respectively, and constitute recording tracks.
• the recording and reproduction of optical information on the optical recording medium 100 which is a single-sided, dual-layer DVD-R The 01-side force is also generated by the laser beam 109 applied to the first recording layer 102 and the second recording layer 105.
• “light transmissive (or transparent)” means that the first recording layer 102 and the second recording layer 105 containing a dye It refers to the light transmittance with respect to the wavelength of the light emitted to record and reproduce information. Specifically, it means that the light has a transmittance of usually 30% or more, preferably 50% or more, more preferably 60% or more, with respect to the wavelength of light for recording and reproduction. On the other hand, the transmittance for the wavelength of light for recording and reproduction is ideally a force of 100%. Normally, the value is 99.9% or less.
• a first substrate 101 having grooves, lands, and pre-pits having irregularities on the surface is formed by injection molding or the like using a nickel stamper or the like.
• a coating solution containing an organic color is applied to the surface of the first substrate 101 having the unevenness by spin coating or the like.
• heating or the like is performed to remove the solvent used for the coating liquid, and the first recording layer 102 is formed.
• the first reflective layer 103 is formed on the first recording layer 102 by sputtering or vapor deposition of an Ag alloy or the like.
• the data substrate 111 formed by laminating the first recording layer 102 and the first reflective layer 103 on the first substrate 101 in this order is referred to as a data substrate 111.
• the data substrate 111 is transparent.
• a precursor of, for example, an ultraviolet-curable resin which is one of radiation-curable resins, is applied to the entire surface of the first reflective layer 103 by spin coating or the like. This is applied to form a resin raw material layer (hereinafter referred to as “ultraviolet curable resin raw material layer” 104a for convenience of description).
• ultraviolet curable resin raw material layer a resin raw material layer
• “radiation” is used to include electron beams, ultraviolet rays, visible lights, and infrared rays.
• the precursor of the ultraviolet curable resin is directly applied on the data substrate 111, but the present invention is not limited to this.
• another layer may be provided on the data substrate 111. good.
• the rotation speed of the spin coat is usually about 500-6000 rpm.
• an ultraviolet curable resin is used as an example of the material of the resin raw material layer.
• the material of the resin raw material layer is not limited to the ultraviolet curable resin, and for example, a thermosetting resin may be used.
• a light-transmitting stamper 110 having an uneven shape is placed on the ultraviolet-curable resin raw material layer 104a.
• ultraviolet rays are irradiated from the light transmitting stamper 110 side through the light transmitting stamper 110 to cure the ultraviolet curable resin.
• the ultraviolet curable resin is sufficiently cured, the light transmitting stamper 110 is peeled off.
• the intermediate layer 104 FIG.
• the placement of the light-transmitting stamper 110 is performed by adjusting the thickness of the ultraviolet-curable resin material layer 104a so as to be within a predetermined range.
• the irradiation of the ultraviolet light for curing the ultraviolet-curable resin material layer 104a is not limited to the irradiation of the light-transmitting stamper 110 side force. For example, a method of irradiating from the side surface of the ultraviolet curable resin material layer 104a can be used.
• the light-transmitting stamper 110 used in the present embodiment is formed of a non-polar member having an uneven shape on the surface.
• the intermediate layer 104 and the light-transmitting stamper 110 can be easily peeled off without imposing an excessive load.
• the possibility that the first recording layer 102 and the first reflective layer 103 are deformed is reduced.
• a signal waveform for recording and reproducing optical information can be stabilized.
• the residue of the UV-curable resin is unlikely to adhere to the light-transmitting stamper 110 side, so that the light-transmitting stamper 110 can be reused!
• polarity refers to a state in which electrons are localized in a molecule and charges are unevenly biased.
• non-polar means a state where the above-mentioned charge bias does not exist.
• Examples of the non-polar member constituting the light transmitting stamper 110 include an inorganic material and an organic material.
• Examples of the inorganic material include inorganic glass.
• Examples of the organic material include a polymer material having no polar group in the molecule.
• a metal stamper having an inverted (negative) concavo-convex pattern for example, Using a metal stamper.
• Examples of such a polar group include a polar group containing an oxygen atom, a polar group containing a nitrogen atom, a polar group containing a sulfur atom, and a polar group containing a halogen atom.
• the polar group containing an oxygen atom include a hydroxyl group, an ether group, an aldehyde group, a carbonyl group, an acetyl group, a carboxyl group and an ester group.
• Examples of the polar group containing a nitrogen atom include an amino group, an imino group, an ammonium group, an amide group, an imide group, a nitro group, a nitroso group, a diazo group, and a nitro group.
• Examples of the polar group containing a sulfur atom include a thiol group, a sulfide group, a sulfonic acid group and the like.
• Examples of the polar group containing a nitrogen atom include a chloro group, a chloromethyl group, a chlorosyl group, a chloryl group, a perchloryl group, a bromo group, an odo group, an odosyl group, and a fluoro group.
• a polymer having an unsaturated bond such as a carbon-carbon double bond, an aromatic monocyclic hydrocarbon group such as a phenyl group, or a condensed polymer such as a naphthyl group can be used. It is preferable not to have a cyclic hydrocarbon group.
• the “polymer material having no polar group in the molecule” is ideally a “polymer having no polar group in the basic structure of the polymer”.
• Examples of the polymer material having no polar group in the molecule include polyolefin.
• Polyolefin has a simple structure consisting of carbon and hydrogen, and thus exhibits nonpolar properties. For this reason, the polyolefin can be easily separated from a radiation-curable resin such as an ultraviolet-curable resin or a thermosetting resin.
• polyolefin has an advantage that the light transmittance for short-wavelength light necessary for curing radiation-curable resin is large.
• polyolefin has the advantage that it does not emit harmful gases and the like when incinerated when discarded after use, and has a small impact on the environment.
• Polyolefins can be classified into crystalline polyolefins and amorphous polyolefins.
• examples of the polyolefin include a polymer of ⁇ -olefin and a polymer of cyclic olefin.
• examples of the ⁇ -olefin polymer include polyethylene, polypropylene, an ethylene-propylene copolymer, and a copolymer of ethylene with an ⁇ -olefin having 412 carbon atoms.
• Examples of such ⁇ -olefins having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 4-methinolate 1-pentene, 1-heptene, 1-otaten, 1-nonene, and 1-decene , 1-dedecene, 1-dodecene, 9-methyl-1-decene, 11-methyl-1-dodecene, 1-tetradecene, 11-hexadecene, 1-octadecene, and 1 eicosene.
• polystyrene resin examples include amorphous polyolefin, which is a hydrogenated product of a ring-opened polymer of tetracyclododecenes and dicyclopentadiene, and the like.
• polyethylene, polypropylene, ethylene-propylene copolymer, and amorphous polyolefin are preferable.
• Polyethylene, polypropylene, and ethylene / propylene copolymers can be molded at low cost, although their transparency is slightly inferior due to their high crystallinity.
• polypropylene and ethylene-propylene copolymer are preferable because of their excellent heat resistance and fatigue resistance (hinge characteristics). Most preferably, it is polypropylene.
• Amorphous polyolefin is excellent in transparency and precision moldability due to its amorphous nature.
• amorphous polyolefin for example, those commercially available under the trade name of ZONEX or ZENOA (manufactured by Zeon Corporation) are preferred.
• Crystalline polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymer are widely used as general molding materials. For this reason, crystalline polyolefin can be obtained at a lower cost than amorphous polyolefin. Therefore, by employing the crystalline polyolefin, it is possible to reduce the cost for manufacturing the multilayered multilayer optical recording medium.
• These crystalline polyolefins are more excellent in fatigue resistance characteristics (hinge characteristics) than amorphous polyolefins. The following advantages are exhibited by the excellent fatigue resistance properties (hinge properties) of crystalline polyolefins.
• the light transmitting stamper is partially deformed. Therefore, when the light-transmitting stamper is used repeatedly, the light-transmitting stamper is repeatedly deformed.
• the light-transmitting stamper made of crystalline polyolefin has excellent fatigue resistance (hinge characteristics) as compared with the light-transmitting stamper made of amorphous polyolefin, and thus the light-transmitting stamper is repeatedly used. Even when the above deformation is repeatedly performed, cracks are unlikely to occur, which is advantageous.
• polypropylene and ethylene-propylene copolymer are preferred because they are particularly excellent in fatigue resistance (hinge properties) and heat resistance.
• the melt flow rate (Melt Flow Rat: MFR) in the molten state is 20 g / 10 min. Or more, preferably 30 g ZlOmin. Or more, more preferably 40 g / 10 min. is there. However, it is usually less than 100gZlOmin.
• the fluidity force of the non-polar material S is preferably in this range because the transferability of the uneven shape is excellent. That is, if the MFR is within the above range, a stamper can be easily formed by injection molding or the like.
• the MFR indicates a measured value when measured under a load of 21.18N in a temperature range from the melting point of the nonpolar member to the decomposition temperature in accordance with ISO 1133. Particularly, in the case of polypropylene and ethylene-propylene copolymer, the value is measured at 230 ° C in accordance with JIS K6921-1.
• the light transmittance of the non-polar member is such that the light having a thickness of 0.
• the transmittance force in a 6 mm test piece is usually 10% or more, preferably 30% or more, and more preferably 50% or more.
• the light-transmitting stamper may contain some release agent, antistatic agent, and impurities in addition to the non-polar polymer material.
• the proportion of the nonpolar polymer material in the light-transmitting stamper is preferably at least 95% by weight, more preferably at least 98% by weight, most preferably at least 99% by weight. Good.
• the upper limit of the content of the nonpolar polymer material is usually 99.999% by weight.
• the thickness of the light transmitting stamper 110 used in the present embodiment is usually preferably 0.3 mm or more from the viewpoints of shape stability and easy handling. However, it is usually 5 mm or less. When the thickness of the light-transmitting stamper 110 is within this range, the light-transmitting stamper 110 has a sufficient light-transmitting property. , And productivity can be improved.
• the outer diameter of the light transmitting stamper 110 be larger than the outer diameter of the first substrate 101 (the outer diameter of the optical recording medium 100). If the outer diameter of the light-transmitting stamper 110 is designed to be larger than the outer diameter of the first substrate 101 in advance, the outer peripheral portion of the light-transmitting stamper 110 outside the outer diameter of the first substrate 101 may be formed during injection molding. Thus, the uneven shape can be formed with a margin, and a good uneven shape can be formed over the entire surface of the light transmitting stamper 110.
• the outer diameter of the light-transmitting stamper 110 is made larger than the outer diameter of the first substrate 101.
• the outer diameter of the light-transmitting stamper 110 is made larger than the outer diameter of the intermediate layer 104 (ultraviolet curable resin material layer 104a).
• the diameter increases.
• the shape of the end face of the intermediate layer 104 becomes good. That is, when the light-transmitting stamper 110 is placed on the ultraviolet-curable resin material layer 104a, the resin of the ultraviolet-curable resin material layer 104a may adhere to the outer peripheral end of the light-transmitting stamper 110. is there. This resin may form burrs when the light transmitting stamper is peeled off.
• the outer diameter of the light-transmitting stamper 110 is larger than the outer diameter of the intermediate layer 104 (ultraviolet-curable resin material layer 104a), the end portion of the ultraviolet-curable resin material layer 104a is easily formed. Is present outside the outer diameter of the intermediate layer 104. As a result, even if the glue is generated, the shape of the end face of the intermediate layer 104 can be improved by removing the portion where the glue is generated.
• the outer diameter of the light-transmitting stamper 110 is larger than the outer diameter of the first substrate 101 by 1 mm or more, preferably 2 mm or more.
• the diameter is usually preferably 15 mm or less, more preferably 10 mm or less.
• a coating solution containing an organic dye is applied to the surface of the intermediate layer 104 by spin coating or the like. Then, heating or the like is performed to remove the solvent used for the coating solution.
• the second recording layer 105 is formed.
• the heating temperature is preferably a temperature equal to or higher than the glass transition temperature of the resin constituting the intermediate layer 104. By heating at the above-described temperature, it is possible to suppress a phenomenon in which the first substrate 101 is warped, which is considered to be caused by shrinkage of the intermediate layer 104.
• the second recording layer 105 is formed directly on the intermediate layer 104. However, the second recording layer 105 may be formed via another layer (for example, a protective layer or a buffer). Needless to say. Through the above steps, a laminated multilayer optical recording medium can be manufactured efficiently.
• a second reflective layer 106 is formed on the second recording layer 105 by sputtering and depositing an Ag alloy or the like.
• a second substrate 108 as a mirror surface substrate obtained by injection-molding polycarbonate is bonded to a second reflective layer 106 via an adhesive layer 107 to form an optical recording medium. 100 production completed.
• the adhesive layer 107 may be opaque or have a slightly rough surface, and a delay-curable adhesive can be used without any problem.
• the bonding layer 107 can be formed by applying an adhesive on the second reflective layer 106 by a method such as screen printing, irradiating ultraviolet rays, placing the second substrate 108 with pressure, and pressing. Further, it is also possible to form the adhesive layer 107 by pressing a pressure-sensitive double-sided tape between the second reflective layer 106 and the second substrate 108.
• the layer configuration in Fig. 1 (f) is an example of an optical recording medium having two recording layers as described above.
• FIG. 1F another layer not shown in FIG. 1F (for example, an underlayer is inserted between the first substrate 101 and the first recording layer 102) may be used. What! / ,.
• the outer diameter of the light-transmitting stamper be larger than the outer diameter of the first substrate. In this regard, mounting and peeling of the light transmitting stamper will be further described.
• FIG. 3 is a diagram showing an example of mounting and peeling of the light transmitting stamper.
• FIG. 3 shows the placement of the light-transmitting stamper 310 and the light-transmitting stamper when the outer diameter of the light-transmitting stamper 310 is the same as the outer diameter of the first substrate 101 and thus the outer diameter of the data substrate 111.
• An example after peeling of 310 is shown.
• the data board 111 is the first record on the first board 101. It has a structure in which a layer 102 and a first reflective layer 103 are sequentially stacked.
• the resin material layer 304a protrudes toward the light transmitting stamper side and the end burr is formed.
• the fat raw material layer 301a may be formed. This is because the resin raw material layer 304a (usually formed of an ultraviolet curable resin) has not yet been cured and has fluidity.
• FIG. 3 (b) after curing the resin material layer 304a (FIG. 3 (a)) and the end burr resin material layer 301a (FIG. 3 (a)), When the 310 is peeled off, an end burr 301 is formed on the intermediate layer 304.
• the end burr 301 is formed in a region very close to the outer diameter of the data board 111. .
• the end burr 301 is very small as compared with the size of the intermediate layer 304. For example, while the diameter of the intermediate layer 304 is 120 mm, the end burr 301 is on the order of several tens of ⁇ m. For this reason, it may be industrially difficult to obtain a good end face shape of the intermediate layer 304 by removing only the end burr 301.
• the outer diameter of the light-transmitting stamper 310 be larger than the outer diameter of the first substrate 101 and thus the outer diameter of the data substrate 111. This will be described with reference to FIG.
• FIG. 4 is a view showing another example of mounting and peeling of the light transmitting stamper.
• FIG. 4 shows the placement of the light-transmitting stamper 410 and the light-transmitting stamper 410 when the outer diameter of the light-transmitting stamper 410 is larger than the outer diameter of the first substrate 101 and thus the outer diameter of the data substrate 111.
• An example after peeling is shown.
• the data substrate 111 has a structure in which the first recording layer 102 and the first reflective layer 103 are sequentially stacked on the first substrate 101.
• the outer diameter of the light transmitting stamper 410 is larger than that of the first substrate 101 and thus the data substrate 111. Therefore, when the light-transmitting stamper 410 is placed on the resin material layer 404a, the end of the resin material layer 404a expands and protrudes toward the outer periphery of the light-transmitting stamper 410. Then, an end flash resin material layer 401a is formed. This is because the resin material layer 404a (usually formed of an ultraviolet curable resin) has not yet been cured and has fluidity.
• the material layer 401a greatly expands outside the outer diameter of the data board 111.
• FIG. 4 (b) after curing the resin material layer 404a (FIG. 4 (a)) and the end burr resin material layer 401a (FIG. 4 (a)), the light-transmitting stamper is formed.
• an end burr 401 is formed on the intermediate layer 404.
• the end burr 401 has a shape that is greatly expanded outside the outer diameter of the data substrate 111 (outer diameter of the intermediate layer 404), similarly to the end glue resin material layer 401a (FIG. 4A). It becomes. For this reason, it becomes easy to remove the end burr 401 existing in the region outside the arrows 420a and 420b and obtain a good end surface shape of the intermediate layer 404.
• FIG. 5 is a view showing still another example of placing and peeling of the light-transmitting stamper.
• FIG. 5 shows the mounting of the light-transmitting stamper 510 and the light-transmitting stamper 510 when the outer diameter of the light-transmitting stamper 510 is larger than the outer diameter of the first substrate 101 and thus the outer diameter of the data substrate 111.
• An example after peeling is shown.
• the data substrate 111 has a structure in which the first recording layer 102 and the first reflective layer 103 are sequentially stacked on the first substrate 101.
• FIG. 5A another resin raw material layer 504a2 is formed on the surface of the light-transmitting stamper 510 having the uneven shape. Then, the light-transmitting stamper 510 is placed so that the resin material layer 504a2 and the resin material layer 504al formed on the data substrate 111 face each other.
• the resin raw material layer 504a2 provided on the light transmitting stamper 510 has an outer diameter larger than the outer diameter of the data substrate 111 (first substrate 101) by the amount of the end resin raw material layer 505a. Therefore, the resin raw material layer 504a2 protrudes greatly outside the outer diameter of the data substrate 111. Then, the end burr resin material layer 501a is formed outside the resin material layer 504a2 (outside the end resin material layer 505a).
• the light transmitting stanno 510 is peeled off, and the end burr 501 is formed on the intermediate layer 504.
• the end burr 501 is formed further outside the end intermediate layer 505 that protrudes largely outside the outer diameter of the data board 111. Therefore, in the end portion existing outside the outer diameter of the data board 111, Interlayer 505 is easy to remove from the locations of arrows 520a and 520b. As a result, the configuration shown in FIG. 5 makes it easier to obtain the intermediate layer 5044 having a favorable end face shape from the viewpoint of industrial production.
• an intermediate layer formed outside the outer diameter of the first substrate 101 and thus the data substrate 111 (the end burr 401 in FIG. 4 (b), the end burr in FIG. 5 (b)).
• the intermediate layer 505 and the end burrs 50 1) usually have an intermediate layer 404 (FIG. 4 (b)), 5044 (FIG. Fig. 5 (b)) It is necessary to separate the force.
• the removal of the end burrs 401 (FIG. 4 (b)), the end intermediate layer 505, and the end burrs 501 (FIG. 5 (b)) formed on the outside are performed by removing the light transmitting stampers 410 and 510. It may be performed before or after peeling. From the viewpoint of production efficiency and improving the dimensional accuracy of the outer diameter of the intermediate layers 404 (FIG. 4 (b)) and 5044 (FIG. 5 (b)), the intermediate layer formed on the outside It is preferable to remove them before peeling 410 and 510. That is, usually, the thickness of the intermediate layer 404 (FIG.
• an intermediate layer formed outside the outer diameter of the data substrate 111 or the first substrate 101 (the end burr 401 in FIG. 4B, and the end burr in FIG. 5B).
• the “intermediate layer protruding portion” may be used. Examples of such a method include a method of dissolving the protruding portion of the intermediate layer with a solvent. Also, for example, a method of mechanically polishing the protruding portion of the intermediate layer can be used. Further, for example, a method of mechanically cutting off the protruding portion of the intermediate layer can also be mentioned.
• a method of optically removing the protruding portion of the intermediate layer can be mentioned.
• the method of improving the precision of the end face shape and the point force that is easy to use in industrial production are also preferable.
• the laser used is not limited as long as it can be used for industrial production.
• the CO laser (wavelength: 10.1) is preferably used as a laser having an end shape of the intermediate layers 404 (FIG. 4 (b)) and 5044 (FIG. 5 (b)) and a power that does not damage the light-transmitting stampers 410 and 510. 6 m).
• industrial laser industrial laser
• the output of No. 2 should be appropriately adjusted and used as long as the protrusions of the intermediate layers 404 (FIG. 4 (b)) and 5044 (FIG. 5 (b)) can be removed.
• the laser trimming is performed by fixing the data substrate 111 on which the intermediate layers 404 (Fig. 4 (b)) and 5044 (Fig. 5 (b)) are laminated and rotating the laser so that the laser irradiation position is good.
• the data substrate 111 on which the intermediate layers 404 (FIG. 4 (b)) and 5044 (FIG. 5 (b)) are stacked may be rotated in a state where is fixed. The latter method is industrially simple (easy to simplify the equipment).
• FIG. 6 is a diagram showing an example of laser trimming and peeling of the light transmitting stamper.
• FIG. 6 (a) shows the light transmitting stamper 610 placed on the resin material layer (not shown in FIG. 6 (a)) as shown in FIG. 4 (a), and then the resin material layer (not shown).
• FIG. 6 (c) is a view showing a state where an intermediate layer 604 is formed by curing an intermediate layer (not shown in FIG. 6 (a)), and the protruding portion (end burr 601) of the intermediate layer is removed by laser trimming.
• FIG. 6B shows a state where the light transmitting stamper 610 is peeled off after the laser trimming.
• the data substrate 111 has a structure in which the recording layer 102 and the first reflective layer 103 are sequentially stacked on the first substrate 101.
• a laser irradiation device (not shown in FIG. 6 (a)) A laser beam is applied from above to form the outer diameter of the intermediate layer 604. At this time, for example, by rotating the data substrate 111, the outer periphery of the intermediate layer 604 can be formed. And then, in Figure 6 (b) As shown, the light transmissive stamper 610 may be peeled off.
• FIG. 7 is a view showing another example of laser trimming and peeling of the light transmitting stamper.
• FIG. 7 (a) shows a light transmitting stamper 710 placed on a resin material layer (not shown in FIG. 7 (a)) as shown in FIG. 7 shows a state in which the intermediate layer 704 is formed by curing the intermediate layer 704 (not shown in (a)), and the protrusions of the intermediate layer (the end intermediate layer 705 and the end glue 701) are removed by laser trimming.
• FIG. FIG. 7B shows a state in which the light transmitting stamper 710 has been peeled off after the laser trimming.
• a laser irradiation device shown in FIG. 7 (a) along the outer diameter of the intermediate layer 704 (the outer diameter is substantially the same as the data substrate 111 or the first substrate 101).
• a laser is irradiated from the above to form the outer diameter of the intermediate layer 704.
• the outer periphery of the intermediate layer 704 can be formed.
• the light transmitting stamper 710 may be peeled off.
• the end intermediate layer 705 since the end intermediate layer 705 is large, the protruding portions of the intermediate layer (the end intermediate layer 705 and the end burr 701) are easily removed.
• the method of peeling the light-transmitting stamper is not particularly limited, but a preferred method is to insert a jig such as a knife edge between the substrate and the light-transmitting stamper to peel the light-transmitting stamper.
• a jig such as a knife edge
• the light transmitting stamper can be easily peeled off industrially.
• FIG. 8 is a perspective view and a cross-sectional view illustrating an example of a state where the light transmitting stamper is mounted.
• FIG. 8A is a perspective view in which a light-transmitting stamper 810 having a planar annular shape is placed on a data substrate 111 having a planar annular shape.
• FIG. 8B is a cross-sectional view taken along line AA ′ of FIG. 8A.
• FIG. 9 is a view for explaining an example of a method of separating the light transmitting stamper from the data substrate.
• FIG. 9 is an explanatory view showing the peeling of the light-transmitting stamper using the knife edge in FIG. Note that, in FIGS. 8 and 9, the recording layer and the reflection layer are illustrated for easy viewing.
• FIG. 8A is a perspective view in which a light-transmitting stamper 810 having a planar annular shape is placed on a data substrate 111 having a planar annular shape.
• FIG. 8B is
• an intermediate layer 804 having an inner diameter larger than the inner diameter of the substrate 111 is formed on the data substrate 111 having a planar annular shape.
• a planar annular light-transmitting stamper 810 having an inner diameter smaller than the inner diameter of the intermediate layer 804 and having a larger outer diameter than the outer diameter of the data substrate 111 (intermediate layer 804) is provided on the intermediate layer 804. It is placed on.
• the term “planar annular shape” refers to a disc-like shape such as a CD or DVD, in which a hollow portion having a predetermined length is formed from the center of the circle! (Fig. 8 (a) reference).
• the light-transmitting stamper 810 is peeled off from the inner side of the data substrate 111 and the light-transmitting stamper 810 between the data substrate 111 and the light-transmitting stamper 810 (arrow 81 in FIG. 8B). This is done by inserting a knife edge in 1). The method of inserting the knife edge from the inner diameter side is also advantageous for industrial production.
• a knife edge 920 is inserted between the data Partially peel off the stamper 910.
• FIG. 9 (c) the data substrate 111 and the light-transmitting stamper 910 are slowly separated at the same time as the compressed air is supplied, and the light-transmitting stamper 910 is completely peeled off.
• FIG. 10 is a view for explaining another example of a method of separating the light transmitting stamper from the data substrate.
• FIG. 10 is an enlarged cross-sectional view of a laminate of the light-transmitting stamper 1010, the intermediate layer 1004, and the data substrate 111 when the knife edge 1020 is inserted.
• the recording layer and the reflective layer are not shown for easy viewing.
• the thickness of the light transmitting stamper 1010 at the portion where the knife edge 1020 is inserted is reduced. Therefore, the knife edge 1020 is preferably inserted because the knife edge 1020 can be inserted well.
• a dual-layer single-sided dual-layer DVD-R having two recording layers containing an organic dye has been described as an example. It is not limited. That is, a resin material layer is applied on the data substrate directly or via another layer, and a light-transmitting stamper having an uneven shape is fixed and then peeled off, and the resin is formed to have the uneven shape of the light-transmitting stamper.
• the present invention relates to an optical recording medium or a laminate for an optical recording medium manufactured by a manufacturing method including a step of forming a resin layer by transferring. The effect of is excellently exhibited. That is, by using a light-transmitting stamper made of a non-polar member, the manufacturing method of the present embodiment can be applied to an optical recording medium having another configuration.
• the present invention can be applied to an optical recording medium having only one recording layer. Further, the present invention can be applied to an optical recording medium having three or more recording layers and two or more intermediate layers. In this case, the manufacturing method of the present embodiment can be applied to forming each of two or more intermediate layers. Further, in the above-described embodiment, a method for manufacturing a so-called substrate-surface illuminated optical recording medium has been described. However, the present invention can be naturally applied to a method for manufacturing a so-called film-surface illuminated optical recording medium.
• each layer constituting the single-sided, double-layer optical recording medium 100 represented by the single-sided, dual-layer DVD-R shown in FIG. 1 (f) will be briefly described.
• the first substrate 101 has excellent optical characteristics, such as having light transmittance and a small birefringence. Further, the first substrate 101 is desirably excellent in moldability such as easy injection molding. Further, it is desirable that the first substrate 101 has low hygroscopicity. Further, the first substrate 101 preferably has shape stability so that the optical recording medium has a certain degree of rigidity.
• the material constituting the first substrate 101 is not particularly limited, but examples thereof include acrylic resin, methacrylic resin, polycarbonate resin, polyolefin resin (particularly amorphous polyolefin), polyester resin, Examples include polystyrene resin, epoxy resin, and glass.
• the thickness of the first substrate 101 is usually 2 mm or less, preferably 1 mm or less.
• the first recording layer 102 generally needs to have higher sensitivity than a recording layer used for an optical recording medium used for a CD-R, a single-sided DVD-R, or the like.
• the power of the incident laser light 109 is reduced by half due to the presence of the first reflection layer 103 described later, and recording is performed with approximately half the power.
• the dye used in the first recording layer 102 has a maximum absorption wavelength ⁇ max in the visible light and near-infrared region of about 350 to 900 nm, and a dye compound suitable for recording with a blue near-infrared microwave laser is used. preferable.
• the dye used for the first recording layer 102 is not particularly limited, but usually, an organic dye material is used.
• organic dye materials include macrocyclic azanannulene dyes (phthalocyanine dyes, naphthalocyanine dyes, porphyrin dyes, etc.), pyromethene dyes, polymethine dyes (cyanine dyes, merocyanine dyes, squarylium dyes, etc.), anthraquinone dyes And azurenium dyes, metal-containing azo dyes, metal-containing indoor phosphorus dyes, and the like. These dyes may be used alone or in combination of two or more.
• the film thickness of the first recording layer 102 is not particularly limited because a suitable film thickness varies depending on a recording method or the like, but is usually 5 nm or more, preferably 10 nm or more, particularly preferably 10 nm, in order to obtain a sufficient degree of modulation. Preferably it is 20 nm or more. However, it is usually 3 ⁇ m or less, preferably 1 ⁇ m or less, and more preferably 200 nm or less, because it is necessary to transmit light.
• the method for forming the first recording layer 102 is not particularly limited, but is generally a thin film forming method generally used such as a vacuum evaporation method, a sputtering method, a doctor blade method, a casting method, a spin coating method, and an immersion method.
• a thin film forming method such as a vacuum evaporation method, a sputtering method, a doctor blade method, a casting method, a spin coating method, and an immersion method.
• a wet film forming method such as a spin coating method is preferable from the viewpoint of mass productivity and cost.
• a vacuum evaporation method is preferable.
• the first reflective layer 103 is required to have a light transmittance of 40% or more, which is low in absorption of recording / reproducing light, and to have an appropriate light reflectance.
• an appropriate transmittance can be provided by providing a thin metal having a high reflectance. It is also desirable to have some degree of corrosion resistance. Further, it is desirable that the first recording layer 102 has a shielding property such that the first recording layer 102 is not affected by leaching of other components such as an upper layer (here, the intermediate layer 104) of the first reflection layer 103.
• the thickness of the first reflective layer 103 is generally 50 nm or less, preferably 30 nm or less, and more preferably Is less than 20 nm. By setting the content within the above range, the light transmittance is reduced to 40% or more. However, the thickness of the first reflective layer 103 is usually 3 nm or more, preferably 5 nm or more, because the first recording layer 102 is not affected by the layer existing on the first reflective layer 103.
• the material forming the first reflective layer 103 is not particularly limited, but a material having a moderately high reflectance at the wavelength of the reproduction light is preferable.
• a material having a moderately high reflectance at the wavelength of the reproduction light is preferable.
• Examples of the method for forming the first reflective layer 103 include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method.
• the intermediate layer 104 is made of a resin that is transparent, can form irregularities such as grooves and pits, and has high adhesive strength. Furthermore, it is preferable to use a resin having a small shrinkage ratio during curing and bonding because the shape stability of the medium is high. Further, it is desirable that the intermediate layer 104 has a material strength that does not damage the second recording layer 105. Also, the intermediate layer 104 is usually often compatible with the second recording layer 105 in many cases. Therefore, it is desirable to provide an appropriate buffer layer between the intermediate layer 104 and the second recording layer 105 in order to prevent compatibility between the two layers and prevent damage to the second recording layer 105. Further, the intermediate layer 104 may be provided with a buffer layer between the intermediate layer 104 and the first reflective layer 103. The thickness of the intermediate layer 104 is usually 5 ⁇ m or more, preferably 10 ⁇ m or more, which is preferably controlled accurately. However, it is usually 100 ⁇ m or less, preferably 70 ⁇ m or less.
• the intermediate layer 104 is provided with a concavo-convex shape spirally or concentrically.
• the uneven shape forms a groove and a land.
• information is recorded / reproduced on / from the second recording layer 105 using such grooves and Z or land as recording tracks.
• the groove width is usually about 200-500 nm, and the groove depth is about 120-250 nm.
• the track pitch is preferably about 0.1 to 2.0 m.
• Examples of the material forming the intermediate layer 104 include thermoplastic resin, thermosetting resin, and radiation curable resin. Using thermoplastic resin, thermosetting resin, etc.
• a coating solution is prepared by dissolving a thermoplastic resin or the like in an appropriate solvent. Then, by applying this coating liquid and drying (heating), the intermediate layer 104 can be formed.
• a coating solution is prepared as it is or by dissolving it in an appropriate solvent. Then, the intermediate layer 104 using a radiation-curable resin can be formed by applying this coating solution and irradiating appropriate radiation to cure. These materials may be used alone or as a mixture.
• the intermediate layer 104 may be used as a multilayer film.
• a coating method a method such as a coating method such as a spin coating method or a casting method is used. Among them, the spin coating method is preferable.
• the intermediate layer 104 using a high-viscosity resin can also be formed by screen printing or the like. It is preferable to use a radiation-curable resin that is liquid at 20 to 40 ° C. By using the radiation-curable resin, application can be performed without using a solvent, so that productivity is improved. Also, it is preferable to adjust the viscosity to 20-4000mPa ⁇ s! /.
• radiation-curable resins are preferable, and among them, ultraviolet-curable resins are preferable.
• UV-curable resins include radical UV-curable resins (radical polymerizable UV-curable resins) and cationic UV-curable resins (cationic UV-curable resins). Either can be used.
• radical ultraviolet curable resin a composition containing an ultraviolet curable compound and a photopolymerization initiator as essential components is used.
• radical type ultraviolet curable conjugate monofunctional (meth) acrylate and polyfunctional (meth) acrylate can be used as the polymerizable monomer component. Each of these can be used alone or in combination of two or more.
• atalylate and meta-atalylate are collectively referred to as (meta) -atalylate.
• the photopolymerization initiator is preferably a molecular cleavage type or a hydrogen abstraction type.
• an uncured ultraviolet-curable resin precursor mainly composed of a radical polymerization type acrylate ester and to cure the precursor to obtain an intermediate layer.
• Examples of the cationic ultraviolet curable resin include an epoxy resin containing a cationic polymerization type photoinitiator.
• Epoxy resins include, for example, bisphenol phenolic hydrin type, alicyclic epoxy, long-chain aliphatic type, brominated epoxy resin, Examples thereof include a gill ester type, a glycidyl ether type, and a heterocyclic system. It is preferable to use an epoxy resin having a low content of free chlorine and chloride ions. The amount of chlorine is preferably 1% by weight or less, more preferably 0.5% by weight or less.
• Examples of the cation polymerization type photoinitiator include sulfodium salt, odonium salt, diazonium salt and the like.
• the second recording layer 105 needs to have higher sensitivity than the recording layer used for an optical recording medium such as a normal CD-R or a single-sided DVD-R, as in the case of the first recording layer 102 described above.
• the second recording layer 105 is desirably a dye having a low heat generation and a high refractive index in order to realize good recording / reproducing characteristics. Further, in the combination of the second recording layer 105 and the second reflection layer 106, it is desirable that the reflection and absorption of light be in appropriate ranges.
• the material constituting the second recording layer 105, the film formation method, and the like may be the same as those of the first recording layer 102. As a method for forming the second recording layer 105, a wet film forming method is preferable.
• the thickness of the second recording layer 105 is not particularly limited because the suitable thickness varies depending on the recording method and the like, but is usually 10 nm or more, preferably 30 nm or more, and particularly preferably 50 nm or more. However, in order to obtain an appropriate reflectance, the thickness of the second recording layer 105 is usually 3 ⁇ m or less, preferably 1 ⁇ m or less, more preferably 200 nm or less.
• the materials used for the first recording layer 102 and the second recording layer 105 may be the same or different.
• the second reflective layer 106 desirably has high reflectivity and high durability.
• the thickness of the second reflective layer 106 is usually at least 20 nm, preferably at least 30 nm, more preferably at least 50 nm. However, in order to increase the recording sensitivity, it is usually 400 nm or less, preferably 300 nm or less.
• second reflective layer 106 As a material constituting second reflective layer 106, a material having sufficiently high reflectance at the wavelength of the reproduction light is preferable.
• a material forming the second reflective layer 106 for example, a metal of Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta or Pd can be used alone or in an alloy.
• Au, Al, and Ag are suitable as materials for the second reflective layer 106 having a high reflectance.
• other components may be included in addition to the main components of these metals.
• Examples of other components include Mg ⁇ Se ⁇ Hf ⁇ V, Nb, Ru, W, Mn, Re ⁇ Fe ⁇ Co, Rh, Ir, Cu, Zn, Cd, Ga, In, Si ⁇ Ge, Te , Pb, Po, Sn, Bi, or a rare earth metal.
• Examples of a method for forming the second reflective layer 106 include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method.
• a known inorganic or organic intermediate layer or adhesive layer may be provided above and below the second reflective layer 106 in order to improve the reflectance, improve the recording characteristics, and improve the adhesion.
• the adhesive layer 107 has a high adhesive strength and a small shrinkage ratio at the time of curing adhesion because the shape stability of the medium is high. Further, the adhesive layer 107 is desirably made of a material that does not damage the second reflective layer 106. However, a known inorganic or organic protective layer may be provided between both layers to suppress damage.
• the thickness of the adhesive layer 107 is usually at least, preferably at least 5 m. However, the thickness of the adhesive layer 107 is usually preferably 10 O / zm or less because there is a problem that the optical recording medium is made as thin as possible and that it takes time for curing and productivity is lowered.
• the same material as the material of the intermediate layer 104 can be used. Further, as the adhesive layer 107, a pressure-sensitive double-sided tape or the like can be used. The adhesive layer 107 can be formed by sandwiching and pressing the pressure-sensitive double-sided tape between the second reflective layer 106 and the second substrate 108.
• the second substrate 108 preferably has high mechanical stability and high rigidity. It is desirable that the adhesiveness with the adhesive layer 107 is high.
• a material the same material as that used for the first substrate 101 can be used. Examples of the material include an A1 alloy substrate such as an A1-Mg alloy having A1 as a main component, an Mg alloy substrate such as an Mg-Zn alloy having Mg as a main component, silicon, titanium, and ceramics. A substrate made of such a material, a substrate obtained by combining them, or the like can also be used.
• the material of the second substrate 108 is preferably polycarbonate in terms of high productivity such as moldability, cost, low hygroscopicity, shape stability, and the like.
• the material of the second substrate 108 is preferably amorphous polyolefin from the viewpoints of chemical resistance, low moisture absorption and the like.
• the material of the second substrate 108 is preferably a glass substrate from the viewpoint of high-speed response and the like.
• the second substrate 108 must be thick to some extent so that the optical recording medium 100 has sufficient rigidity.
• the thickness of the second substrate 108 is preferably 0.3 mm or more. However, it is 3 mm or less, preferably 1.5 mm or less.
• the optical recording medium 100 may have any other layer in the above-described laminated structure, if necessary. Alternatively, any other layer may be provided on the outermost surface of the medium. Further, the optical recording medium 100 can be printed on a surface other than the incident surface of the recording light or the reproduction light, if necessary, by various printers such as ink jet and thermal transfer, or various writing tools. A container may be provided. Further, two optical recording media 100 may be bonded together with the first substrate 101 facing outward. By bonding two optical recording media 100, a large-capacity medium having four recording layers can be obtained.
• phase-change rewritable compact disc CD-RW, CD-Rewritable
• phase-change rewritable DVD trademark
• Phase-change type CD-RW or DVD-RW utilizes the reflectance difference and the phase difference change caused by the refractive index difference between the amorphous state and the crystalline state in the recording layer composed of the phase-change recording material. The recording information signal is detected.
• phase-change recording material examples include, for example, SbTe-based, GeTe-based, GeSbTe-based, InSbTe-based, AgSbTe-based, AglnSbTe-based, GeSb-based, GeSbSn-based, InGeSbTe-based, and InGeSbSnTe-based materials.
• SbTe-based, GeTe-based, GeSbTe-based, InSbTe-based, AglnSbTe-based, GeSb-based, GeSbSn-based, InGeSbTe-based, and InGeSbSnTe-based materials examples include, for example, SbTe-based, GeTe-based, GeSbTe-based, InSbTe-based, AgSbTe-based, AglnSbTe-based, GeSb-based, GeSbSn-based, InGeSbTe-based, and InG
• Injection molding is performed using an injection molding machine (Nissei Kogyo Co., Ltd .: M04 0D3H) using a nickel master having a track pitch of 0.74 ⁇ m, a width of approximately 0.37 ⁇ m, and a depth of approximately 160 nm. ).
• Table 1 shows the main molding conditions for each resin material.
• the light-transmitting stampers obtained by injection molding each have a guide groove accurately transferred from a nickel master disk! / It was confirmed that.
• FIG. 2 is a graph showing the measurement results of the light transmittance of the polypropylene light-transmitting stamper at a wavelength of 200 nm to 500 nm.
• the light transmittance was measured using an ultraviolet-visible spectrophotometer (V-560, manufactured by JASCO Corporation).
• the above-mentioned light-transmitting stampers were placed on the UV-curable resin material layers, respectively, and the UV-curable resin was cured by irradiating UV rays. Thereafter, a knife edge was inserted from the center hole portion (inner diameter side) of the light transmissive stamper to the non-coating portion of the intermediate layer. Then, the light-transmitting stamper and the ultraviolet-curable resin material layer were peeled off by applying force. At this time, the peelability was evaluated according to the following criteria.
• the same light transmissive stamper was repeatedly used, and the number of usable times was obtained.
• the number of usable times is used to evaluate the number of times the light-transmitting stamper can be used repeatedly (the number of times it can be used repeatedly).
• An intermediate layer was formed on a reflective layer formed by a sputtering method on a disk-shaped substrate having an outer diameter of 120 mm and a center hole having an inner diameter of 15 mm.
• the intermediate layer was formed as follows In other words, 2.5 g of an uncured UV-cured resin precursor (viscosity: 1200 mPa's) mainly composed of a radical polymerization type acrylate was dropped in a circular shape at a position of 25 mm inside diameter on the reflective layer. The film was rotated and stretched at 3500 rpm for 15 seconds to form a UV curable resin material layer.
• the above-described light-transmitting stamper made of polypropylene (Example 1) and the light-transmitting stamper made of amorphous polyolefin (Example 2) were used, respectively, under vacuum evacuation! / Finally, they were bonded so that the guide groove of the light transmissive stamper and the application surface of the UV curable resin material layer faced each other. Subsequently, a metal halide lamp was irradiated from the light-transmitting stamper side in a nitrogen atmosphere to cure the ultraviolet curing resin to form an intermediate layer. Illumination and the integrated light amount of ultraviolet rays is a measure of the wavelength of 365 nm, were respectively 216mW / cm 2, 1092mj / cm 2
• a UV-curable resin was cured in the same manner as in Example 1, and a peel test of the light-transmitting stamper was performed.
• Example 3 A recording layer by spin coating and a reflective layer by sputtering were formed on a disk-shaped substrate having an outer diameter of 120 mm and a center hole having an inner diameter of 15 mm.
• a reflective layer On this reflective layer, 2.3 g of an uncured UV-curable resin precursor (viscosity: 260 mPa-s) mainly composed of a radical polymerization type acrylate was dropped in a ring shape at a position of an inner diameter of 25 mm. Thereafter, the film was rotated and stretched at 4000 rpm for 6 seconds to form an ultraviolet-curable resin material layer.
• an uncured UV-curable resin precursor viscosity: 260 mPa-s
• end burrs vertical burrs at the ends of the ultraviolet curable resin
• This portion was laser-trimmed using a CO gas laser manufactured by KEYENCE CORPORATION.
• An intermediate layer was formed in the same manner as in Example 3 except that the shape of the light transmitting stamper was a disk having an outer diameter of 124 mm and a center hole having an inner diameter of 15 mm.
• the manufacturing efficiency of the laminated multilayer optical recording medium by the 2P method is improved.

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• 2004
  • 2004-11-11 WO PCT/JP2004/016746 patent/WO2005048253A1/ja active Application Filing
  • 2004-11-11 CN CNB2004800287186A patent/CN100421163C/zh not_active Expired - Fee Related
  • 2004-11-12 TW TW093134724A patent/TW200519938A/zh not_active IP Right Cessation
• 2006
  • 2006-03-01 US US11/364,010 patent/US20060145373A1/en not_active Abandoned

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