Patent ID: 7485357
Filing Date: 2009-02-03
Classification: G11B,Y10T

Abstract:
1. An optical recording medium comprising: a substrate having translucency; a first protective layer thereon; a recording layer composed of a phase-change material; a second protective layer; a third protective layer; and a reflective layer, wherein laser beam irradiation causes phase-change of the recording layer between a crystalline phase and an amorphous phase thereby at least one of to rewrite and to record information, wherein the phase-change material comprises Ga, Sb and Sn, Ga content, Sb content, and Sn content satisfy the following formula, and the total content of Ga, Sb and Sn is at least 92 atomic % of the entire phase-change material: wherein the first protective layer has a film thickness of 40 nm to 200 nm, the recording layer has a film thickness of 6 nm to 20 nm, the second protective layer has a film thickness of 4 nm to 20 nm, the third protective layer has a film thickness of 2 nm to 10 nm, and the reflective layer has a film thickness of 100 nm to 300 nm.