Abstract: An optical recording medium is described, having suitable recording characteristics over a wide range of recording linear speed and fitting with recording/reproduction apparatuses of CD-R specifications. The optical recording medium includes a substrate having at least a light absorbing layer thereon, which is mainly composed of three phthalocyanine compounds (I), (II) and (III). Each of the phthalocyanine compounds (I) and (II) has a thermal decomposition temperature of from 200° C. to 300° C., and has a different light absorption ability against light having a wavelength of 780 nm. The phthalocyanine compound (III) has a thermal decomposition temperature of from 300° C. to 350° C.

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.

Abstract: The object of the present invention is to provide a two-layered optical recording medium using dye layers for a recording layer which triggers no jitter noise and the like against not only a red laser beam but also against low-power output laser beam such as a blue laser beam, has high archival properties, and is capable of high-density recording, and a method and an apparatus for the optical recording and reproducing. Thus, the optical recording medium comprises a substrate, and a first information layer, and a second information layer disposed on the substrate through an intermediate layer to perform recording and reproducing on the first information layer and the second information layer respectively by irradiating laser beam from the first information layer side.

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 recording medium includes a first information substrate selected from one including a first substrate and a read-only first recording layer containing a reflective film and having information pits, and one including a first substrate with guide grooves, a first recording layer containing an organic dye, and a first reflective layer arranged in this order; and a second information substrate including a second substrate with guide grooves, a second reflective layer, a second recording layer containing an organic dye, and an inorganic protective layer in this order. The first and second information substrates are bonded with the interposition of an optically transparent organic interlayer so that the first and second substrates each face outward, and information recorded on the first and second recording layers is reproduced by applying light from a surface of the first substrate.

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.

Abstract: An optical recording medium having a substrate, and a recording layer provided on the substrate and containing: (a) a formazan metal chelate including a formazan compound and a metal component, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) at least one additional dye selected from phthalocyanine compounds and pentamethine cyanine compounds. Alternatively, the recording layer contains (a) a first formazan metal chelate including a first formazan compound and a first metal component and having the maximum absorption wavelength in the range of 500 to 650 nm, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) a second formazan metal chelate including a second formazan compound and a second metal component and having the maximum absorption wavelength different from that of the first formazan metal chelate and in the range of 650 to 750 nm.

Abstract: An optical recording medium is described, having suitable recording characteristics over a wide range of recording linear speed and fitting with recording/reproduction apparatuses of CD-R specifications. The optical recording medium includes a substrate having at least a light absorbing layer thereon, which is mainly composed of three phthalocyanine compounds (I), (II) and (III). Each of the phthalocyanine compounds (I) and (II) has a thermal decomposition temperature of from 200° C. to 300° C., and has a different light absorption ability against light having a wavelength of 780 nm. The phthalocyanine compound (III) has a thermal decomposition temperature of from 300° C. to 350° C.

Abstract: An optical recording medium having a substrate, and a recording layer provided on the substrate and containing: (a) a formazan metal chelate including a formazan compound and a metal component, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) at least one additional dye selected from phthalocyanine compounds and pentamethine cyanine compounds. Alternatively, the recording layer contains (a) a first formazan metal chelate including a first formazan compound and a first metal component and having the maximum absorption wavelength in the range of 500 to 650 nm, (b) a squarylium metal chelate including a squarylium compound and a metal component; and (c) a second formazan metal chelate including a second formazan compound and a second metal component and having the maximum absorption wavelength different from that of the first formazan metal chelate and in the range of 650 to 750 nm.

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 &lgr; 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 &lgr; of from 645 nm to 670 nm.

Abstract: The optical recording medium at least a transparent substrate; a reflection layer; and a print layer. The print layer has a multilayer structure in which a plurality of ink layers made from different inks that have different specific gravities are stacked. A sum of products of viscosity &ggr; (in poise) and weight M (in gram) of the ink used to form the ink layer in the print layer satisfies a relation 30≦&Sgr;&ggr;iMi (g·Poise)≦150.

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 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 &mgr;m to 1.7 &mgr;m, and a half-amplitude level thereof in a range of 0.4 &mgr;m to 0.75 &mgr;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: The optical recording medium at least a transparent substrate; a reflection layer; and a print layer. The print layer has a multilayer structure in which a plurality of ink layers made from different inks that have different specific gravities are stacked. A sum of products of viscosity &ggr; (in poise) and weight M (in gram) of the ink used to form the ink layer in the print layer satisfies a relation 30≦&Sgr;&ggr;iMi (g·Poise)≦150.