Patent ID: 6245404
Filing Date: 2001-06-12
Classification: G11B,Y10S,Y10T

Abstract:
An optical disc comprising:a substrate;a first dielectric film formed on the substrate and comprised of ZnS--SiO.sub.2 and having a thickness ranging from about 70 nm to 130 nm;recording layer including at least a phase change film whose phase is changed between a crystalline state and an amorphous state thereby to record an information signal, said phase change recording film formed on the first dielectric film and made from a chalcogen compound containing Ge and having a thickness ranging from about 18 nm to about 30 nm;a second dielectric film formed on the phase change recording film comprising ZnS--SiO.sub.2 and having a thickness ranging from about 10 nm to 30 nm;a light reflection film formed on said recording layer and constituted by an Al alloy containing Cu in a range from 0.1 to 1.0 atomic %.