Patent ID: 7241549
Filing Date: 2007-07-10
Classification: G11B,Y10S

Abstract:
1. An optical recording medium comprising: a substrate; a light reflection layer; a multi-layer first protection layer; a recording layer containing a phase-change material which changes between crystalline and amorphous phases by a light irradiation; a second protection layer; and one of a cover layer and a protective coating layer disposed on the substrate in this order; wherein, the light reflection layer comprises one of an Al alloy and an Ag alloy; the multi-layer first protection layer comprises (i) a ZnS—SiO a film-thickness of the first protection layer is 25 nm or less; the recording layer comprises Ge, Sb, and Te as main elements; and the second protection layer comprises a mixture of ZnS and SiO the intermediate layer has a thickness ⅕ to ½ times a thickness of the ZnS—SiO