Patent ID: 6551681
Filing Date: 2003-04-22
Classification: G11B,Y10T

Abstract:
An optical recording medium having a substrate defining a corrugated and uneven groove track configuration on one major surface thereof; and a first dielectric film, a phase recording film, a second dielectric film and a reflection film which are sequentially stacked on said one major surface of said substrate, characterized in:said phase recording film being made of a GeInSbTe alloy material, and said reflection film being made of a AgPdCu alloy material; in said GeInSbTe alloy material forming said phase recording film, content of Ge being in the range from 1 weight % to 8 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 2.2 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 each depression in said groove track configuration being in the range from 35 nm to 44 nm, distance between two adjacent boundaries at opposite sides of said depression among boundaries between crests and depressions being in the range of 0.35 &mgr;m to 0.50 &mgr;m, thickness of said first dielectric film being in the range of 75 nm to 95 nm, thickness of said phase recording film being in the range of 12 nm to 20 nm, thickness of said second dielectric film being in the range of 16 nm to 28 nm, and thickness of said reflection film being in the range of 80 nm to 160 nm.