Provided are a filament for 3D printing and a method for producing a crystalline soft resin molded article. The present invention is capable of molding a resin in a wide temperature range without excessively increasing an extrusion temperature via a 3D printer, and is capable of producing a crystalline soft resin molded article having excellent soft texture, shape reproducibility, shape retention, heat resistance, and the like. The present invention pertains to a filament for 3D printing, the filament comprising a polyester-based thermoplastic elastomer which has a Duro D hardness (JIS K6253-1993) of 40 or less and in which thermal properties measured by a differential scanning calorimeter (DSC) satisfy the following conditions: the melting peak temperature (A) when the temperature is raised at 10°C/min is 120-220°C; the crystallization peak temperature (B) when the temperature is lowered at 10°C/min is 60-160°C; and the half-temperature width of the crystallization peak when the temperature is lowered at 10°C/min is 10-30°C.
PIONEER DIGITAL DESIGN AND MANUFACTURING CORPORATION (Japan)
MITSUBISHI KAGAKU MEDIA CO., LTD. (Japan)
TAIYO YUDEN CO., LTD. (Japan)
Inventor
Tomita, Yoshimi
Taniguchi, Shoji
Yokogawa, Fumihiko
Hirano, Hiroyuki
Sasaki, Yoshio
Nishiwaki, Hiroshi
Katata, Keiji
Shirota, Akira
Okuyama, Takehisa
Furukawa, Junichi
Tominaga, Yasuhiko
Maruyama, Toshihiko
Muto, Hideyuki
Miyanabe, Shogo
Fuse, Shoji
Chiba, Zenjirou
Fujii, Toru
Kakimoto, Hiroya
Abstract
A recording/reproducing apparatus (100, 100a) is provided with: a characteristic evaluation processing means (108), which performs characteristic evaluation processing for evaluating characteristics relating to a recording medium (200, 200a) on the basis of reproducing signals relating to the recording medium; and recording means (102, 105, 107), which record characteristic evaluation information in a recording medium specific region that is at least a part of a region different from a recording data region where user data can be recorded, said characteristic evaluation information including (i) characteristic evaluation result information, which indicates results of the characteristic evaluation processing; (ii) apparatus information, which is related to the characteristic evaluation result information, and which indicates an apparatus that has performed the characteristic evaluation processing, and (iii) evaluation condition information, which is related to the characteristic evaluation result information, and which indicates evaluation conditions when the characteristic evaluation processing is performed.
PIONEER DIGITAL DESIGN AND MANUFACTURING CORPORATION (Japan)
MITSUBISHI KAGAKU MEDIA CO., LTD. (Japan)
TAIYO YUDEN CO., LTD. (Japan)
Inventor
Tomita, Yoshimi
Taniguchi, Shoji
Yokogawa, Fumihiko
Hirano, Hiroyuki
Sasaki, Yoshio
Nishiwaki, Hiroshi
Fuse, Shoji
Furukawa, Junichi
Chiba, Zenjirou
Fujii, Toru
Kakimoto, Hiroya
Abstract
A recording medium (100, 200) is provided with a recording data area (130, 230) in which user data is recordable. In the recording medium, deterioration determination information including information indicating a region to be used for a deterioration determination for determining the degree of deterioration of the recording medium is recorded in an area different from the recording data area. By referring to the deterioration determination information when a deterioration inspection is performed on the recording medium, the time and the like can be significantly reduced compared with when the deterioration inspection is performed on the entire area of the recording medium.
Provided are a method for manufacturing optical storage media which exhibits improved manufacturing efficiency and an apparatus for manufacturing the optical storage media. In the provided method for manufacturing an optical storage medium, which has a plurality of recording layers on a substrate and an indented intermediate layer between the plurality of recording layers, the intermediate layer formation step includes at least: a first step in which a radiation-curable resin material is applied between a radiation-transparent stamper and a substrate having a recording layer, then superimposing the radiation-transparent stamper on the substrate having the recording layer; a second step in which the radiation-transparent stamper and the substrate having the recording layer are twisted while being pressed towards each other, stretching the radiation-curable resin material; a third step in which only the vicinity of a central hole in the substrate is irradiated with radiation, curing the radiation-curable resin material; and a fourth step in which the substrate having the recording layer and the radiation-transparent stamper are rotated and the radiation-curable resin material is simultaneously cured, bonding the radiation-transparent stamper and the substrate having the recording layer to each other.
Disclosed is a hydrazide chelate complex compound, which exhibits both excellent solubility in a coating solvent and excellent light resistance when used as a dye for forming a recording layer of an optical recording medium, and which is applicable to high speed recording (especially to BD-R) using blue laser light. Specifically disclosed is a hydrazide chelate complex compound represented by general formula (I).
C07D 233/61 - Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with hydrocarbon radicals, substituted by nitrogen atoms not forming part of a nitro radical, attached to ring nitrogen atoms
C07D 401/12 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
C07D 403/12 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group containing two hetero rings linked by a chain containing hetero atoms as chain links
C07D 405/14 - Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing three or more hetero rings
C07D 413/12 - Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
C07D 417/12 - Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group containing two hetero rings linked by a chain containing hetero atoms as chain links
Disclosed is an optical recording medium which has excellent reflectivity uniformity, durability, signal strength, or the like in recording/reproducing function layers other than a recording/reproducing function layer that is farthest from the incidence side of laser light in a multilayered optical recording medium. The optical recording medium which comprises a translucent recording/reproducing function layer that has at least a first protective layer, a second protective layer, a recording layer, a third protective layer, a reflecting layer, and a fourth protective layer in this order from the incidence side of the laser light, wherein the second protective layer and the fourth protective layer are composed of materials having the same constituent elements, wherein the refractive index of the second protective layer is greater than the refractive index of the first protective layer by not more than 0.3, and wherein, when the film thickness of the second protective layer is set as D2, the film thickness of the fourth protective layer is set as D4, and the reflectivity before recording when the laser light is focused on the recording layer is set as R, the positive and negative of increasing rates d(R)/d(D2) and d(R)/d(D4) relative to the film thickness of R are inverse.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/243 - Record carriers characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
7.
AZO METAL CHELATE DYE AND OPTICAL RECORDING MEDIUM
Disclosed is a dye which can be used for an optical recording medium which has both excellent high-speed recording characteristics and excellent reproduction durability. The dye is obtained by coordinating an azo compound represented by the formula to a metal ion. (In the formula, ring A represents a nitrogen-containing heterocyclic aromatic ring containing a carbon atom and a nitrogen atom; X represents C-R1R2, an oxygen atom, a sulfur atom or N-R3; R1, R2 and R3 independently represent a hydrogen atom, a linear or branched alkyl group, an aralkyl group, a cycloalkyl group, a linear or branched alkenyl group, an aryl group or an acyl group expressed as -COR4; R4 represents a hydrocarbon group or a heterocyclic group, which may be substituted; and benzene ring B represents an optionally substituted benzene ring, and adjacent substituents of the benzene ring B may combine with each other to form a ring.)
C07D 417/12 - Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group containing two hetero rings linked by a chain containing hetero atoms as chain links
C09B 45/22 - Monoazo compounds containing other metals
G11B 7/243 - Record carriers characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
C09B 29/36 - Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds
8.
METHOD OF STORING OPTICAL RECORDING MEDIUM DISKS AND STACKING TABLE FOR STORING THEREON STACK OF OPTICAL RECORDING MEDIUM DISKS
A method of storing optical recording medium disks does not cause damage to the surfaces of the disks during storage and transportation thereof. A method of storing optical recording medium disks on a stacking table provided with a base table and a center projection shaft upstanding from the base table. The disks each have a hole penetrating between the front and rear sides thereof and allowing the center projection shaft to be inserted therethrough. The method uses a circular dummy disk having formed therein a hole and also having formed in the periphery of the hole a ring-like projection having a height of 0.20 mm or more. The hole in the dummy disk penetrates between the front and rear sides thereof and allows the center projection shaft to be inserted therethrough. To store the optical recording medium disks, the dummy disk and the optical recording medium disks are stacked in this order by inserting the center projection shaft through the holes in the dummy and recording medium disks.
Disclosed is an information recording medium having a print receiving layer which is hardly damaged, while having extremely high color developability, high gloss and high driability. The print receiving layer is formed from a print receiving layer-coating liquid having good handling properties. Also disclosed is a method for producing such an information recording medium. Specifically disclosed is an information recording medium (I) having a substrate (10), and at least an optical information recording layer (11), a base layer (14) and a print receiving layer (15) formed on the substrate (10). The information recording medium (I) is characterized in that the base layer (14) contains not more than 2.6% by mass of an antifoaming agent or a leveling agent, and the print receiving layer (15) is composed of a porous layer mainly containing inorganic fine particles having an average secondary particle diameter of not more than 500 nm and a polyvinyl acetal.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
G11B 7/26 - Apparatus or processes specially adapted for the manufacture of record carriers
10.
OPTICAL RECORDING MEDIUM AND ITS RECORDING/REPRODUCTION METHOD
Provided is an optical recording medium which will not lower a signal characteristic without degrading mechanical property or storage stability even after the medium is left under a high temperature and a high humidity. The optical recording medium performs recording/reproduction by a blue laser. When the medium is left under a temperature of 80 degrees C and a relative humidity 80% for 500 hours, the value obtained by the ratio of [error rate after the environment resistant test]/[error rate before the environment resistant test] is 10 or less.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
11.
RADIATION CURABLE COMPOSITION FOR BACKING LAYER OF OPTICAL RECORDING MEDIUM, CURED PRODUCT OF THE SAME, AND OPTICAL RECORDING MEDIUM USING THE SAME
Disclosed is a radiation curable composition for backing layer of optical recording medium, which enables to suppress warping of an optical recording medium due to changes in ambient temperature or humidity when used for a backing layer of the optical recording medium. Also disclosed are a cured product of such a radiation curable composition, and an optical recording medium using such a radiation curable composition. Specifically disclosed is a radiation curable composition which is characterized in that a cured film thereof having a thickness of 100 &mgr;m, which is obtained by being irradiated with an ultraviolet light having a wavelength of 254 nm at an irradiation intensity of 1.0 J/cm2 by using a high pressure mercury lamp, has a tensile modulus at 5˚C of not less than 1,400 MPa.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
Disclosed is an optical recording medium having a satisfactory level of surface hardness, causing less deformation when the temperature and the humidity of the environment are changed, and having an excellent balance among the properties. Specifically disclosed is an optical recording medium which comprises, in this order: a resin substrate; a layer having recording and reproducing functions; a protective layer which is composed of a cured product of a radiation-curable composition comprising an urethane (meth)acrylate (A) and a (meth)acrylate compound (B) other than the urethane (meth)acrylate (A); and a hard coat layer having a surface hardness rating of B or harder, wherein the ratio of the tensile elasticity at 25°C and the humidity of 45% to the tensile elasticity upon absorbing water to its maximum level in the protective layer is 0.20 or greater.
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
G11B 7/26 - Apparatus or processes specially adapted for the manufacture of record carriers
Disclosed is an optical recording medium on/from which high-density optical information is recorded/reproduced by short wavelength light such as blue laser. Specifically disclosed is an optical recording medium having a substrate and a recording layer formed on the substrate and capable of recording or reproducing information by irradiation of light. This optical recording medium is characterized in that the recording layer contains a cyanine dye represented by the following general formula [I]. (In the formula [I], A1 and B1 independently represent an optionally substituted aromatic ring, and at least one aromatic ringof A1 and B1 contains a nitrogen atom; R1 and R2 independently represent a substituent, and R1 and/or R2 may be bonded with another cation; X1, X2, X3 and X4 independently represent an organic group, and X1 and X2 and/or X3 and X4 may combine together to form a ring structure; Y1 represents a hydrogen atom or an organic group; and Z- represents an anion.)
In an information recording medium having a plurality of recording regions of different track pitches and groove shapes, it is possible to realize stable focus servo and tracking servo. A recording track formed by a convex/concave pattern includes a first and a second recording region (R1, R2) and a recording region transition section (Sx) arranged between the first and the second recording region (R1, R2). The first recording region (R1) has a track pitch tp1, groove width w1, and a groove depth d1 and the second recording region (R2) has a track pitch tp2, a groove width w2, and a groove depth d2. These track pitches, the groove widths, and the groove depths satisfy Expression (1) and Expression (2) and/or Expression (3). 0 ឬ ‖tp1 - tp2‖ (1) 0 ឬ ‖w1 - w2‖ (2) 0 ឬ ‖d1 - d2‖ (3) The recording region transition section Sx includes a track pitch transition section Stp where the track pitch changes from tp1 to tp2 and a groove shape transition section Sg where the groove width changes from w1 to w2 and/or the groove depth changes from d1 to d2. The track pitch transition section Stp and the groove shape transition section Sg shares at least a partial region SL.
An optical recording medium, which has an excellent recessed/protruding shape and performs stable optical information recording/reproduction, is manufactured. An optical recording medium (100) is provided with an intermediate layer (104) having the recessed/protruding shape. A method for manufacturing the optical recording medium is provided with a step of forming a recording layer (102) on a substrate (101); a step of forming a bonded body (112), which has the substrate (101), the recording layer (102), a resin material layer (104a) and a stamper (110), by hardening the resin material layer (104a) in a status where the resin material layer (104a) and the stamper (110) having a transferring recessed/protruding shape are placed in this order on the recording layer (102); and a step of removing the stamper (110) from the resin material layer (104a) to transfer the transferring recessed/protruding shape to the resin material layer (104a), and forming the intermediate layer (104) by performing surface modification treatment for promoting hardening of the resin material layer (104a).
G11B 7/26 - Apparatus or processes specially adapted for the manufacture of record carriers
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/244 - Record carriers characterised by the selection of the material of recording layers comprising organic materials only
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
16.
METAL-CHELATE AZO DYE AND OPTICAL RECORDING MEDIUM
Disclosed is a metal-chelate azo dye suitable for a recording layer for an optical recording medium having a high-speed recording capability or an optical recording medium having multiple recording layers. Also disclosed is an optical recording medium. Specifically disclosed is a metal-chelate azo dye comprising an azo dye compound represented by the general formula (1) and Zn2+. (1) wherein R1 represents a linear or branched alkyl group which may be substituted or a cycloalkyl group which may be substituted; Y represents a linear or branched alkyl group substituted by at least two fluorine atoms; R2, R3, R4, R5 and R6 independently represent a hydrogen atom or a linear or branched alkyl group which may be substituted, provided that R3 and R4, R4 and R5, or R5 and R6 may together form a ring; and a proton in the compound of the formula (1) is desorbed so as to form, together with a Zn2+, a chelate dye.
Disclosed is an azo metal chelate dye which is suitably used in a recording layer for an optical recording medium having multiple recording layers or an optical recording medium capable of being recorded at high speed. Also disclosed is an optical recording medium. Specifically disclosed is an azo metal chelate dye comprising an azo dye compound represented by the general formula (1) and a metal. General Formula (1) wherein R1 represents a linear or branched alkyl group which may be substituted or a cycloalkyl group which may be substituted; R2 and R3 independently represent a hydrogen atom, a linear or branched alkyl group which may be substituted, an aryl group which may be substituted, or a heterocyclic group which may be substituted; R4, R5, R6, R7 and R8 independently represent a hydrogen atom or a linear or branched alkyl group which may be substituted, provided that R4 and R5, R4 and R6 or R5 and R7 may together form a ring; and Y represents a linear or branched alkyl group which is substituted by at least two fluorine atoms, provided that the chelate dye is formed from a product produced by eliminating a proton from the compound of the formula (1) and a metal.
Provided is an optical recording medium having an excellent jitter characteristic and preferable recording/reproduction characteristic and capable of performing significantly high-density recording. An optical recording medium (20) includes: a substrate (21) on which a guide groove is formed, a layer (23) having a light reflection function, a recording layer (22) containing a predetermined porphyrin compound as a main content, and a cover layer (24) capable of transmitting a recording/reproduction light coming into the recording layer (22) which are layered in this order on the substrate (21). When the guide groove portion farther from the plane where the recording/reproduction light beam comes into the cover layer (24) serves as the recording groove portion, the reflected light intensity at the recording pit portion formed in the recording groove portion is higher than the reflected light intensity when no recording is performed at the recording groove portion.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/244 - Record carriers characterised by the selection of the material of recording layers comprising organic materials only
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
19.
HYDRAZIDE CHELATE COMPLEX COMPOUND, OPTICAL RECORDING MEDIUM USING THE COMPOUND AND RECORDING METHOD THEREOF
Disclosed is a novel hydrazide chelate complex compound excellent in both solubility in a coating solvent and light resistance, which is applicable to a blue laser recording and useful as a dye for forming a recording layer of an optical recording medium. The hydrazide chelate complex compound is represented by the general formula (1) below. Also disclosed is a dye for forming a recording layer of an optical recording medium, which contains this compound. (1) In the formula, ring A represents an aromatic ring; R1 and R6 respectively represent an aromatic ring group or a monovalent non-aromatic ring substituent having 20 or less carbon atoms; R2-R5 respectively represent a hydrogen atom, an aromatic ring group or a monovalent non-aromatic ring substituent having 20 or less carbon atoms; n represent 0 or 1; a represents a number of 1-3; M represents a transition metal atom; and X represents a group 14-16 element atom of the periodic table.
Disclosed is a recording medium which is more excellent in storage stability than the conventional recording media. Specifically disclosed is an optical recording medium comprising a reflective layer, a first dielectric layer, a recording layer, a second dielectric layer and a light transmitting layer sequentially in this order on a substrate, wherein recording is performed by decomposing the recording layer by heating. This optical recording medium is characterized by comprising a third dielectric layer between the second dielectric layer and the light transmitting layer.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
21.
HEAT-SENSITIVE PRINTING LAYER AND OPTICAL RECORDING MEDIUM
Disclosed is a heat-sensitive printing layer suitable for thermal printing using a thermal head. Also disclosed is a heat-sensitive printing layer which does not limit the material from which it is made. Specifically disclosed is a heat-sensitive printing layer which is thermally printable by using a thermal head. This heat-sensitive printing layer is characterized by comprising a color coupler layer containing a heat-sensitive color coupling material and a curable resin, and a developer layer containing a developer and a curable resin. Also specifically disclosed is an optical recording medium characterized by comprising such a heat-sensitive printing layer and a recording/reproducing function layer.
B41M 5/28 - Thermography using thermo-chromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat decomposable compounds, e.g. gas liberating
B41M 5/30 - Thermography using chemical colour formers
B41M 5/40 - Thermography combined with layers or compositions suitable for other methods of image registration; Special originals for reproduction by thermography
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/26 - Apparatus or processes specially adapted for the manufacture of record carriers
22.
HEAT-SENSITIVE PRINTING LAYER AND OPTICAL RECORDING MEDIUM USING THE HEAT-SENSITIVE PRINTING LAYER
Disclosed are a heat-sensitive printing layer which is thermally printable by using a thermal head, and an optical recording medium. Specifically disclosed is a heat-sensitive printing layer which is thermally printable by using a thermal head and characterized by containing a heat-sensitive color coupling material, a developer and a curable resin. This heat-sensitive printing layer is further characterized in that the curable resin has a modulus of elasticity at 30˚C of not less than 1000 Pa and a modulus of elasticity at 150˚C of not more than 1100 Pa. Also specifically disclosed is an optical recording medium characterized by comprising a heat-sensitive printing layer and a recording/reproducing function layer where recording or reproduction is performed by light. The optical recording medium is further characterized in that the heat-sensitive printing layer is arranged on a side of the recording/reproducing function layer which side is opposite to the side on which light is incident.
B41M 5/28 - Thermography using thermo-chromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat decomposable compounds, e.g. gas liberating
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 23/40 - Identifying or analogous means applied to, or incorporated in, the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader or photograph
Provided is a method for manufacturing an optical recording medium, by which a stamper is excellently removed from a transfer layer at the time of manufacturing the optical recording medium having an intermediate layer whose shape is uneven. A first recording medium (100) whereupon a recording/reproducing function layer (2) and a lower intermediate layer (3) are stacked in sequence is formed on a substrate (1). A transfer layer stacked stamper (200) having a transfer layer (6), which is formed by semicuring an ultraviolet curing resin film applied on the surface of a stamper (4) having an uneven shape and by further curing the film under a low oxygen concentration atmosphere, is formed. Then, the first recording medium (100) is bonded with the transfer layer stacked stamper (200) so that the lower intermediate layer (3) and a transfer layer (6) face each other, then, the stamper (4) is removed.
Disclosed is a high-quality archival optical recording medium which enables to obtain good recording/reproducing characteristics in high-speed recording and high-density recording. Specifically disclosed is an optical recording medium comprising a resin substrate, a recording layer containing an organic dye and a reflective layer. This optical recording medium is characterized in that the reflective layer has a first reflective layer and a second reflective layer in this order from the side close to the recording layer, the second reflective layer has a lower thermal conductivity than the first reflective layer, and the first reflective layer is thicker than the second reflective layer.
This invention provides a very high-density optical recording medium that has excellent jitter properties and good record reproduction properties. An optical recording medium (20) comprises a substrate (21) having guide grooves, a layer (23) having a light reflective function, a recording layer (22) containing as a main component a coloring matter having the function of absorbing light at a record reproducing light wavelength in an unrecorded state, and a cover layer (24), which is permeable to record reproducing light incident to the recording layer (22), in that order. An intermediate layer (30) containing at least one element selected from the group consisting of Ta, Nb, V, W, Mo, Cr, and Ti is provided between the layer (23) having a light reflective function and the recording layer (22).
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/244 - Record carriers characterised by the selection of the material of recording layers comprising organic materials only
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
Disclosed is an optical recording medium capable of recording/reproducing high-density optical information by using a short wavelength light such as a blue laser. Specifically disclosed is an optical recording medium comprising at least a substrate and a recording layer which is formed on the substrate and capable of recording or reproducing information by irradiation of light. The recording layer contains an azacyanine dye represented by the following general formula ⏧I]. (In the formula, R1 and R2 independently represent a hydrogen atom or an optionally substituted linear or branched alkyl group having 1-4 carbon atoms; R3 represents a hydrogen atom or a hydrocarbon group; R4 represents a hydrogen atom or a linear or branched alkyl group having 1-4 carbon atoms, R5 represents an optionally substituted aromatic ring group or an optionally substituted unsaturated heterocyclic group, and R4 and R5 may combine together to form a ring structure; X- represents a counter anion; and the benzene ring A may be substituted.)
C07D 209/14 - Radicals substituted by nitrogen atoms, not forming part of a nitro radical
C07D 405/12 - Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
C09B 23/00 - Methine or polymethine dyes, e.g. cyanine dyes
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/244 - Record carriers characterised by the selection of the material of recording layers comprising organic materials only
27.
METHOD AND APPARATUS FOR PRODUCING OPTICAL RECORDING MEDIUM
Disclosed are a method and apparatus for producing an optical recording medium which comprises an intermediate layer having a good corrugated surface and only few defects at low cost. Specifically, a recording layer is formed on a substrate directly or via another layer, and a resin material layer is formed on the recording layer directly or via another layer. Then a stamper, which has a corrugated pattern for transfer corresponding to the corrugated surface to be formed, is placed on the resin material layer, and a bonded body is obtained by curing the resin material layer. After that, the stamper is separated from the resin material layer while heating the bonded body, thereby forming the resin material layer into an intermediate layer having a transferred corrugated pattern.
Provided is a printing method capable of performing label printing on an optical recording medium to which address information is attached, with a suppressed position shift when performing an additional printing accompanying addition of recording data and capable of preferably performing a high-quality label printing. An optical recording medium (M) includes a recording/reproducing function layer capable of recording or reproducing by a laser beam, an information recording/reproducing surface (3) into which the laser beam comes, and a printing layer existing at the opposite side of the information recording/reproducing surface so as to sandwich the recording/reproducing function layer. Address information used upon recording or reproduction is recorded in the recording/reproducing function layer. The laser beam is applied to the information recording/reproducing surface (3) to detect the address information and printing is performed on the printing layer by using the detected address information.
G11B 23/40 - Identifying or analogous means applied to, or incorporated in, the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader or photograph
29.
OPTICAL RECORDING MEDIUM, AZO-TYPE IRON CHELATE COLORING MATTER, AND AZO-TYPE METAL CHELATE COLORING MATTER ADDITIVE
This invention provides an optical recording medium for recording and reproducing information with light having a wavelength of not more than 700 nm, which has excellent light resistance and can realize good high-speed recording and good high-density recording. The optical recording medium comprises a substrate, a recording layer provided on the substrate and comprising a matrix coloring matter, which, upon exposure to light having a wavelength of not more than 700 nm, can record or reproduce information, and a reflective layer. The recording layer contains an azo-type metal chelate coloring matter additive comprising at least any of Cu2+, Fe2+ and Co2+ as a central metal ion.
Disclosed is an optical recording medium which can increase the gloss of a print receptive layer provided on a level surface and can provide a high-quality print. An optical recording medium (200) comprises a record-reproducing layer (10) which is a substrate-incident medium and a print receptive layer (20) which can be printed with an ink and is provided on the surface opposite to the surface of the record-reproducing layer (10) which receives the irradiation with light. The print receptive layer (20) comprises a filler-containing layer (22) which contains a hydrophilic resin and an organic or inorganic filler as main ingredients and a non-filler-containing layer (21) which is laminated on the filler-containing layer (22) and contains no organic or inorganic filler. The filler-containing layer (22) comprises a first filler-containing layer (222) provided on the record-reproducing layer (10) and a second filler-containing layer (221) which contacts with the non-filler-containing layer (21) and contains the organic or inorganic filler in a higher amount than the first filler-containing layer (222).
Disclosed is a hard coat agent exhibiting excellent antistatic property, wear resistance and abrasion resistance while having high productivity and storage reliability. The hard coat agent contains a (meth)acrylate compound (A) containing a hydroxyl group in a molecule, a conductive metal oxide (B), a photopolymerization initiator (C) and a low boiling point alcohol solvent (D). An optical disk is produced by applying such a hard coat agent to a surface of an optical disk on which laser light is to be incident by spin coating at room temperature at a rotation speed of 1000-7000 rpm, and then curing the hard coat agent through ultraviolet irradiation without going through a step for removing the low boiling point alcohol solvent (D).
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
C08L 69/00 - Compositions of polycarbonates; Compositions of derivatives of polycarbonates
32.
INFORMATION RECORDING MEDIUM, INFORMATION REPRODUCING DEVICE AND METHOD, AND APPARATUS AND METHOD FOR MANUFACTURING INFORMATION RECORDING MEDIUM
An information recording medium (100) is provided with (i) a first information recording area wherein a first track for reproducing first information based on a first track pitch is formed by a laser beam, and (ii) a second information recording area wherein a second track for reproducing second information based on a second track pitch different from the first track pitch is formed by a laser beam. The groove shape of the first track is different from the groove shape of the second track.
G11B 7/007 - Arrangement of the information on the record carrier, e.g. form of tracks
G11B 7/09 - Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track f
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
33.
INFORMATION RECORDING MEDIUM, INFORMATION REPRODUCING DEVICE AND METHOD, AND APPARATUS AND METHOD FOR MANUFACTURING INFORMATION RECORDING MEDIUM
An information recording medium (100) is provided with (i) a first information recording area wherein a first track for reproducing first information based on a first track pitch is formed by a laser beam, and (ii) a second information recording area wherein a second track for reproducing second information based on a second track pitch different from the first track pitch is formed by a laser beam. In the second track, a recording mark is previously recorded.
G11B 7/007 - Arrangement of the information on the record carrier, e.g. form of tracks
G11B 7/09 - Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track f
Disclosed is an optical recording medium capable of recording and/or reproducing high-density optical information by using a short-wavelength laser light having a wavelength of 350-530 nm. This optical recording medium comprises a recording layer formed on a substrate and containing a metal complex compound. The metal complex compound is composed of a cyclic &bgr;-diketone azo compound represented by the general formula ⏧I] or ⏧II] below and a divalent metal ion coordinated to the cyclic &bgr;-diketone azo compound.
An optical recording medium having a resin layer of uniform thickness formed while suppressing air sucking in the resin layer and bubbling in the resin layer is obtained. While mounting, on recording medium (1) making use of a circular substrate with center hole (2), disk-shaped cap member (9) having an outer diameter larger than the center hole (2) so that the center hole (2) is plugged, there is formed resin film (A) covering the level difference defined by the cap member (9) and the recording medium (1), the resin film (A) resulting from hardening of liquid resin material (a). Hardening resin material (c) for formation of resin layer (11) is fed on the cap member (9), and the recording medium is rotated so as to achieve rotational stretching of the hardening resin material (c). During the rotational stretching or after the rotational stretching, the hardening resin material (c) is hardened, thereby attaining formation of the resin layer (11) on the recording medium (1).
There is provided an optical recording medium for high-density recording or high-speed recording having a preferable recording characteristic in a wide range of recording linear velocity and an excellent light resistance. The optical recording medium includes at least a recording layer formed by an organic dye and a reflection layer containing metal arranged on a substrate having a coaxial or a spiral groove. Recording is performed with the minimum mark length not greater than 0.4 騜m or with a recording linear velocity not smaller than 35.0 m/s. The guide groove on the substrate has a track pitch not greater than 0.8 騜m, a groove width not greater than 0.4 騜m, and a recording layer film thickness in the groove not greater than 70 nm. The organic dye single layer forming the recording layer has a dye holding ratio not greater than 70% in Wool scale 5th grade (light resistance test) of the light irradiation condition shown in ISO-105-B02. The differentiation value dR/d阳 (%/nm) of the reflection ratio R of the reflection layer for the wavelength 阳 in the air is not greater than 3 in the wavelength band from 300 nm to 500 nm.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/243 - Record carriers characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
G11B 7/258 - Record carriers characterised by the selection of the material of layers other than recording layers of reflective layers
An optical recording medium having excellent recording/reproducing characteristics for high-speed recording. The optical recording medium is successively provided with a reflecting layer, a recording layer including a dye, and a transparent resin layer on a substrate. A barrier layer is arranged between the recoding layer and the resin layer, heat conductivity (M) of a material used for the barrier layer is 70W/m K or more at 300K as bulk, and film thickness (t) of the barrier layer is smaller than 5nm.
G11B 7/24 - Record carriers characterised by shape, structure or physical properties, or by the selection of the material
G11B 7/254 - Record carriers characterised by the selection of the material of layers other than recording layers of protective topcoat layers
G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
38.
OPTICAL RECORDING MEDIUM, METAL COMPLEX COMPOUND AND ORGANIC DYE COMPOUND
⏧PROBLEMS] To provide an optical recording medium having a recording layer improved in light stability that is capable of recording and regeneration of high-density optical information by short-wavelength laser beams. ⏧MEANS FOR SOLVING PROBLEMS] There is provided an optical recording medium comprising a recording layer containing an organic dye compound wherein the recording layer contains a metal complex compound composed of any of pyridone azo compounds of the following general formulae ⏧I] to ⏧III] having a 6-hydroxy-2-pyridone structure as a coupler component and having an isoxazole, 1,2,4-triazole or pyrazole structure as a diazo component and, coordinating therewith, an ion of bivalent metal, such as nickel, cobalt, iron, zinc, copper or manganese. ⏧I] ⏧II] ⏧III] In the general formulae ⏧I] to ⏧III], each of R1 to R10 independently is a hydrogen atom or a monovalent functional group.
⏧PROBLEMS] To provide a stamper for replicating a substrate having uniform thickness distribution in an optical disc substrate manufacturing method having a high production efficiency with a short cycle time. ⏧MEANS FOR SOLVING PROBLEMS] A stamper (10) having a shape wherein a thickness of an annular base body (11) increases in a direction from an inner circumference section (13) to an outer circumference section (14) so that a difference between the outer circumference section (14) and the inner circumference section (13) is 5騜m or more. The thickness distribution of a recording area of the optical disc substrate formed by a die to which the stamper (10) is attached has a difference (Smax-Smim) of less than 10騜m between the maximum value (Smax) and the minimum value (Smim) in thickness. The optical disc substrate can be used especially as a disc substrate for a multilayer optical recording medium.
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