Patent ID: 6403193
Filing Date: 2002-06-11
Classification: G11B,Y10T

Abstract:
An optical recording medium comprising a phase change type recording layer on a surface of a substrate with reading light incident on the recording layer through the substrate, and a dielectric layer provided in contact with the recording layer and on a side of the recording layer on which the reading light is incident, said substrate having a groove acting as a guide groove and a land between adjacent grooves so that the groove and land are used as recording tracks, wherein:said phase change type recording layer contains Ag, In, Sb and Te as main components, said phase change type recording layer has a thickness tR defined by tR&lE;&lgr;p/20 where &lgr;p is a wavelength of said reading light, and said dielectric layer has a thickness td1 that is represented in terms of an optical path length at said wavelength &lgr;p and defined by &lgr;p/2&lE;td1.