Abstract: A method of manufacturing an optical recording substrate, comprising the steps of: contacting the surface having pit or land/grooves of a stamper having the pit or land/grooves to an organic polymer sheet having a glass transition temperature of 120 to 190° C., a single-pass birefringence retardation of +10 nm to ?10 nm and a thickness of 0.35 mm or less under reduced pressure; and thermally pressing them. According to this method, an optical recording substrate which can transfer a stamper pattern to a thin organic polymer sheet easily and thoroughly can be manufactured.

Abstract: A method of manufacturing an optical recording substrate, comprising the steps of:

Abstract: An optical recording medium for recording and reproducing information utilizing the change of a physical property of a recording layer caused by the irradiation with light, which comprises a substrate, characterized in that the substrate comprises a hydrogenated styrene polymer having a content of nucleus-hydrogenated styrene units of 80 wt % or more, has a glass transition temperature of 110° C. or higher, has a light transmittance of 88% or more at 400 nm, and exhibits an absolute value of retardation of 30 nm or less at 0° and 30° from the normal direction of the plane thereof. The optical recording medium suitable for use in the high density optical recording capable of responding to a greater number of openings and the use of a light having a shorter wave length in an optical head.

Abstract: A magneto-optical recording medium, comprising a substrate, a magneto-optical recording layer on the substrate, a transparent thermally-insulating layer of one selected from the group consisting of tantalum oxynitride and tantalum oxide on the magneto-optical recording layer, and a metal reflecting layer on the transparent thermally-insulating layer, the metal reflecting layer having a thermal conduction represented by a product of a thermal conductivity multiplied by a layer thickness of not less than 1.3.times.10.sup.-6 WK.sup.-1. Heat dispersion is improved while maintaining a high recording sensitivity.

Abstract: In the magneto-optical recording medium with a transparent substrate, a film of dielectric indium oxide, tin oxide or metallic Ti is interposed between the substrate and the recording layer, to prevent deterioration of the properties thereof.

Abstract: A metal reflecting layer of an aluminum or silver alloy containing gold has a lower thermal conductivity than aluminum or silver and gold while maintaining a high reflectivity, and thus an optical recording medium, particularly a magneto-optical recording medium, having a high recording sensitivity and a C/N ratio, as well as an improved durability, can be provided. The content of Au in the Al alloy is 0.5-20 at % and that in the silver alloy is 0.5-30 at %. Preferably, at least one of the group consisting of titanium, tantalum, zirconium and yittrium is added to an alloy of Al or Ag with Au, and the content of at least one of the group consisting of titanium, tantalum, zirconium and yittrium is preferably 0.3-5.0 at % in an Al-Au alloy and 0.3-12.0 at % in an Ag-Au alloy. More preferably, the total content of Au and at least one of the group consisting of titanium, tantalum, zirconium and yittrium is 1.0-15 at %.

Abstract: A solar cell module is made lightweight without a substantial loss of the performance of the module by using a transparent hollow multilayer structure in which a plurality of transparent sheets are spaced at a distance by reinforcing members inserted between and connected to the transparent sheets as a window member as well as a supporting member of the module by disposing said transparent hollow multilayer structure on the light receiving side of a solar power generation element.

Abstract: In a selectively light-transmitting laminated structure composed of(1) a substrate layer (A) of a transparent sheet-like structure,(2) a heat wave-reflective layer (D) of a silver-containing metal having a thickness of 50 to 300 .ANG. formed on layer (A),(3) either a transparent thin layer (B.sub.1) having a high refractive index placed between layers (A) and (D), or a transparent thin layer (B.sub.2) having a high refractive index on layer (D), or both layers (B.sub.1) and (B.sub.2), and(4) optionally, a transparent top layer (E) on layer (D); the improvement wherein a thin layer (C) having a thickness of 3 to 100 .ANG. and deposited as a material selected from the group consisting of Ti, Zr, In, Si, C, Co and Ni is provided on layer (D) in contact therewith.