Patent ID: 6621787
Filing Date: 2003-09-16
Classification: B82Y,G11B,Y10T

Abstract:
An optical storage medium, comprising:a substrate made of glass, polycarbonate, PMMA, or an acrylate resin, and having an unevenness structure of a track pitch of 0.3-0.4 &mgr;m and a groove depth of 50-800 Ã¥; a reflective layer formed on said substrate, made of one of aluminum, nickel, copper, platinum, silver and gold, and having a thickness of 100-400 Ã¥; a first dielectric layer formed on the reflective layer, made of Si3N4 or ZnS-SiO2, and having a thickness of 100-400 Ã¥; a recording layer formed on the first dielectric layer, made of one of TbFeCo, NdTbFeCo and TbFe, and having a thickness of 150-400 Ã¥; a second dielectric layer formed on the recording layer, made of Si3N4 or ZnS-SiO2, and having a thickness of 300-800 Ã¥; a protective layer formed on the second dielectric layer, made of one of an optically transparent inorganic material and an organic material, and having a thickness of 5-100 &mgr;m; and a lubricant film formed on the protective layer and having a thickness of 1-3 nm and which does not chemically react with said protective layer.