Abstract: An electrochromic compound having in the molecule at least an adsorbable group, a redox chromophore and a spacer portion, and represented by the following General Formula (1): wherein A represents the adsorbable group, C represents the redox chromophore, and X represents the spacer portion represented by the following formula; wherein R1 and R3 each represent an aliphatic hydrocarbon group or an aromatic derivative group, R2 represents a hydrogen atom or a monovalent group.

Abstract: An electrochromic compound represented by the following General Formula (1). A-(CX2)n—B ??General Formula (1) In the formula, A is a monovalent binding group, B is a redox chromophore, X is a halogen atom, and n is an integer of 1 or more.

Abstract: Provided is an optical recording medium that comprises two layers of a first information recording layer and a second information recording layer; the first information recording layer and the second information recording layer are laminated through an intermediate layer; wherein the two layers are recorded and regenerated by action of laser light irradiated from the side of the first information recording layer, the second information recording layer comprises a light reflective layer, a dye recording layer, and an inorganic protective layer on a substrate, and the substrate comprises wobble convex portions on its surface, the inorganic protective layer has a thickness of 3 nm to 40 nm, the dye recording layer comprises a cyanine compound expressed by General Formula (I) and a squarylium compound expressed by General Formula (II):

Abstract: The present invention relates to an optical recording medium containing a first substrate, a first information layer, an intermediate layer, a second information layer and a second substrate in this order, wherein the first information layer contains a first recording layer disposed on the first substrate and the second information layer contains a reflective layer, a second recording layer containing an organic dye and a protective layer which are disposed on the second substrate in this order; and the second recording layer contains an organic dye which is at least one elected from the group consisting of the specified squarylium metal chelate compounds.

Abstract: The object of the present invention is to provide an optical recording medium which includes a substrate, a first information layer and a second information layer, the first information layer and the second information layer are disposed on the substrate through an intermediate layer in a laminar structure; recording and reproducing is performed on each of the two information layers by laser beam irradiation from the first information layer side; the second information layer is provided with at least a reflective layer, a dielectric layer, and a second dye recording layer formed in this order; and the dielectric layer is formed from any one of materials selected from the group consisting of oxides, nitrides, sulfides, carbides or mixtures thereof from any one of elements which are not same as metal elements and semi-metal elements used for forming the reflective layer.

Abstract: An optical information recording medium including a substrate in which at least one of a groove and a pit is formed; a recording layer located overlying the substrate and including a dye; and a reflection layer located overlying the recording layer, wherein the optical information recording medium has an absorbance curve with an absorbance L of from 10 to 40% against light having a wavelength ? of from 645 nm to 670 nm, a ratio (Lmax/Lmin) of a maximum absorbance Lmax of the absorbance curve to a minimum absorbance Lmin of from 1.0 to 2.0 at the wavelength range of from 645 nm to 670 nm, and a reflectance of from 45 to 85% against the light having a wavelength ? of from 645 nm to 670 nm.

Abstract: The present invention provides a two-layered optical recording medium containing a first substrate, a second substrate, a first information layer, an intermediate layer, and a second information layer, wherein a laser beam is made incident on the optical recording medium from the first substrate side to perform any one of recording and reproducing of information; the first information layer contains at least a first dye-containing recording layer and a first reflective layer; the second information layer contains at least a second dye-containing recording layer and a second reflective layer; the first reflective layer contains an alloy of any one of Au, Ag, and Cu with at least one selected from Au, Ag, Cu, Al, Ti, V, Cr, Ni, Nd, Mg, Pd, Zr, Pt, Ta, W, Si, Zn, and In; and the first information layer has a light transmission factor of 15% to 60% and a reflectance of 15% to 50%.

Abstract: The present invention is aimed to provide a high-performance single-sided double-layer optical recording medium with reduced crosstalk between recording marks, wherein favorable recording signal properties are obtained even from the second recording layer located more distant from the substrate to which the light is applied, and reproducing method thereof, and an optical recording and reproducing apparatus. The optical recording medium possesses the following aspects: the optical recording medium comprises a first substrate, a first information layer, an intermediate layer, a second information layer and a second substrate in this order; the first information layer comprises a first recording layer; the second information layer comprises a second reflective layer, a second recording layer with an organic dye and a protective layer; and the pyrolysis temperature range, the DTA peak width of the thermal analysis on the organic dye in the second recording layer, is 45° C. or less.

Abstract: An optical information recording medium containing a first information substrate including a first substrate having a guide groove thereon, a first recording layer including a dye, overlying the first substrate and a first reflective layer being a semi-transmittance layer, overlying the first recording layer, a second information substrate comprising, a second substrate having a guide groove thereon, a second recording layer comprising a dye, overlying the second substrate, a second reflective layer being a semi-transmittance layer, located overlying the second recording layer and a light transmittance protective layer overlying the second reflective layer and a transparent intermediate layer. Further, the following relationships (1) and (2) are satisfied: (1) 0.3?nd/??0.7, wherein n represents refractive index in the complex refractive index n-ik of the light transmittance protective layer, d represents a thickness thereof, and ? is at least one of a recording wavelength and a playback wavelength, (2) k?0.

Abstract: Squarylium-metal chelate compounds as recording materials for optical recording media, and optical recording media using these compounds, which have excellent recording properties, light resistance and storage stability. The squarylium-metal chelate compound is represented by following Structural Formulas (1) and (2): In the formula (1), M represents a metal atom capable of coordinating; “a”, “b” and “c” each represents a squarylium dye ligand of formula (2), where “a” is different from “b”; and “c” may be the same as or different from “a” or “b”; and “m” represents 0 or 1. In the formula (2), R1 and R2 are the same or different and each represents an alkyl group, aralkyl group, aryl group or heterocyclic group, each of which may be substituted; and X represents an aryl group which may be substituted, a heterocyclic group which may be substituted, or Z3=CH—, wherein Z3 represents a heterocyclic group which may be substituted.

Abstract: This invention provides a recording method for an optical recording medium having superior high-speed recording, and a playable optical recording medium in which data pits are formed by this recording method. For this purpose, recording materials having special thermal decomposition characteristics are used for the recording layer of the optical recording medium, and the recording pulse pattern at the inner circumference and outer circumference of the optical recording medium is adjusted to be suitable for high-speed recording conditions.

Abstract: An optical information recording medium containing a first information substrate including a first substrate having a guide groove thereon, a first recording layer including a dye, overlying the first substrate and a first reflective layer being a semi-transmittance layer, overlying the first recording layer, a second information substrate comprising, a second substrate having a guide groove thereon, a second recording layer comprising a dye, overlying the second substrate, a second reflective layer being a semi-transmittance layer, located overlying the second recording layer and a light trasnmittance protective layer overlying the second reflective layer and a transparent intermediate layer. Further, the following relationships (1) and (2) are satisfied: (1) 0.3?nd/??0.7, wherein n represents refractive index in the complex refractive index n-ik of the light trasnmittance protective layer, d represents a thickness thereof, and ? is at least one of a recording wavelength and a playback wavelength, (2) k?0.

Abstract: An optical information recording medium containing a first information substrate including a first substrate having a guide groove thereon, a first recording layer including a dye, overlying the first substrate and a first reflective layer being a semi-transmittance layer, overlying the first recording layer, a second information substrate comprising, a second substrate having a guide groove thereon, a second recording layer comprising a dye, overlying the second substrate, a second reflective layer being a semi-transmittance layer, located overlying the second recording layer and a light transmittance protective layer overlying the second reflective layer and a transparent intermediate layer. Further, the following relationships (1) and (2) are satisfied: (1) 0.3?nd/??0.7, wherein n represents refractive index in the complex refractive index n-ik of the light transmittance protective layer, d represents a thickness thereof, and ? is at least one of a recording wavelength and a playback wavelength, (2) k?0.

Abstract: It is an object of the present invention to provide a recording and reproducing method for dye-based recordable DVD medium which performs a recording of a shortest mark by one pulse light of a highest intensity, and a recording of the second shortest and following marks by one pulse light with a pulse power less intense than the pulse power of the shortest mark and both head and tail of the pulse are high powered for a predetermined time, wherein the recording is performed on the recording layer containing an organic dye formed on a substrate having a guide groove, wherein the power of irradiated light besides the pulse light which corresponds to the mark formation is 1.2% to 22% based on the pulse power of the shortest mark, and wherein the recording linear velocity is 12 m/s or more during recording of each mark.

Abstract: An optical recording medium, a method for producing the optical recording medium, and a method and apparatus for recording and reproducing the optical recording medium are provided.

Abstract: The object of the present invention is to provide a single-sided double-layer recording/reproducing optical recording medium, wherein favorable recording signal properties may be obtained even from the second recording layer. An optical recording layer comprises, layered in the order from the recording/reproducing light incident plane, a first substrate, a first recording layer comprising an organic dye as a main component, a first reflective layer, a bonding layer, an inorganic protective layer, a second recording layer comprising an organic dye as a main component, a second reflective layer and a second substrate and permits recording/reproducing by a red laser beam, wherein the optical recording medium is characterized by the depth of guide grooves formed in the second substrate which is in any one of the ranges from 200 ? to 600 ? and from 1,900 ? to 2,700 ?.

Abstract: A hybrid optical recording medium is provided with a ROM portion dedicated to reproduction and a recordable portion in which writing is possible. In one embodiment, a dual-layer optical recording medium is disclosed. First and second substrates form the dual-layer medium with an inorganic protective layer interposed therebetween.

Abstract: An optical information recording medium includes a substrate with a wobble groove and/or pits being formed on one surface thereof, a colorant recording layer provided on the surface of the substrate, and a metallic reflection layer provided on the colorant recording layer, wherein the wobble groove has a track pitch in a range of 1.5 ?m to 1.7 ?m, and a half-amplitude level thereof in a range of 0.4 ?m to 0.75 ?m, and the colorant recording layer includes a specific phthalocyanine compound represented by formula (I) as defined in the specification, and a method of producing the optical information recording medium is proposed.

Abstract: An optical information recording medium including a substrate in which at least one of a groove and a pit is formed; a recording layer located overlying the substrate and including a dye; and a reflection layer located overlying the recording layer, wherein the optical information recording medium has an absorbance curve with an absorbance L of from 10 to 40% against light having a wavelength ? of from 645 nm to 670 nm, a ratio (Lmax/Lmin) of a maximum absorbance Lmax of the absorbance curve to a minimum absorbance Lmin of from 1.0 to 2.0 at the wavelength range of from 645 nm to 670 nm, and a reflectance of from 45 to 85% against the light having a wavelength ? of from 645 nm to 670 nm.

Abstract: The object of the present invention is to provide an optical recording medium which comprises a substrate, and a first information layer and a second information layer disposed on the substrate, and an intermediate layer disposed between the first information layer and the second information layer, wherein any one of recording and reproducing is performed in the first information layer and the second information layer by irradiating a laser beam from the first information layer side, the second information layer comprises a protective layer, a second dye layer which comprises an organic dye, an oxidized layer, and a reflective layer in this order from the laser beam irradiation side, and the oxidized layer comprises an oxide which is a material constituting the reflective layer.