Patent ID: 6548138
Filing Date: 2003-04-15
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising:a substrate having corrugated and ridge-and-concavo-convex groove tracks on one major surface thereof; and a first dielectric film, phase-versatile recording film, second dielectric film and reflection film that are sequentially stacked on the one major surface of said substrate, said phase-versatile recording film being made of a GeInSbTe alloy material, and said reflection film being made of an AgPdCu alloy material, in said GeInSbTe alloy material forming said phase-versatile recording film, content of Ge being in the range from 1 weight % to 6 weight %, content of In being in the range from 2 weight % to 6 weight %, and ratio of Sb relative to Te being in the range of 2.4 times to 3.0 times, and in said AgPdCu alloy material forming said reflection film, content of Pd being in the range of 0.9 weight % to 1.5 weight %, and content of Cu being in the range of 0.9 weight % to 1.1 weight %, depth of the furrow on said substrate having said groove tracks being in the range from 30 nm to 40 nm, distance between two adjacent boundaries at opposite sides of said furrow being in the range of 0.27 &mgr;m to 0.33 &mgr;m, amplitude of said corrugation being in the range of 30 nm to 35 nm at 0-peak; thickness of said first dielectric film being in the range of 65 nm to 80nm, thickness of said phase-versatile recording film being in the range of 12 nm to 18 nm, thickness of said second dielectric film being in the range of 12 nm to 20 nm, and thickness of said reflection film being in the range of 80 nm to 160 nm.