Patent ID: 6709801
Filing Date: 2004-03-23
Classification: G11B,Y10S

Abstract:
An information recording medium for recording information through a change of atomic configuration and/or a change of an electron state upon irradiation of a laser beam, including:a substrate having a groove shape of a groove depth value dg; a recording layer having a shape reflecting said groove shape; and thin films of three layers formed of a first interference layer, a second interference layer and a first interface layer having mutually different compositions, and interposed between said substrate and said recording layer in order named from a side closer to said substrate; said first interface layer being interposed between said second interference layer and said recording layer, and contacting with said recording layer; wherein:thermal conductivity of said first interference layer is lower than thermal conductivity of said second interference layer, and a refractive index of said second interference layer is smaller than refractive indices of said first interference layer and said recording layer; and a distance between said first interference layer and said recording layer is not greater than said groove depth value dg.