Patent ID: 8372501

Claim:
An optical information recording medium comprising: a supporting substrate; a light-transmitting protective layer which is a layer on an incident side of recording and reproducing laser light; and an information recording layer intervening between the supporting substrate and the light-transmitting protective layer, wherein the information recording layer includes a phase-change material layer, a dielectric layer and a metal layer in this order from the incident side of laser light, the dielectric layer being in direct contact with the metal layer on one side of the dielectric layer, and the dielectric layer being in direct contact with the phase-change material layer on the other side of the dielectric layer, and the dielectric layer is constituted of, as a main component, (In 2 O 3 ) x (SnO 2 ) 1-x , wherein x is satisfied with the relationship of (0.4<x≦0.7).