Optical information recording medium and method of designing its structure

摘要

Phase-change-type optical recording medium comprises a first dielectric layer, a recording layer made of a phase change material, a second dielectric layer and a reflecting layer wherein the thicknesses of the first and second dielectric layers are determined for a given thickness of the recording layer so that the following conditions are satisfied; DELTA A+ DELTA R>/=20% and DELTA A>/=5% wherein DELTA A=A(cry)-A(amo), A(cry), A(amo): light absorption rates of the recording layer in the crystal state and amorphous state, respectively, DELTA R=R(cry)-R(amo), R(cry) and R(amo): light reflection rates of the recording lates in the crystal state and amorphous state, respectively.