Patent ID: 7358031
Filing Date: 2008-04-15
Classification: G11B,Y10S

Abstract:
1. An optical information recording medium comprising a substrate, a plurality of optical information recording layer units formed as a set of layers stacked on said substrate with interposition of a transparent intermediate layer between adjacent ones of said optical information recording layer units, each of said optical information recording layer units including an optical recording layer for recording an optical signal, a plurality of dielectric multilayer reflecting layers laminated on said optical recording layer, and a variable refractive index thin film formed as a layer stacked within said dielectric multilayer reflecting layers and exhibiting a nonlinear and reversible change of its complex refractive index induced by light irradiation, wherein each of said dielectric multilayer reflecting layers is formed as a repetitive and alternate laminate of both low refractive index thin films and high refractive index thin films successively stacked toward the substrate, wherein said intermediate layer has a film thickness of 0.3 μm to 3 μm.