PHASE TRANSITION TYPE OPTICAL INFORMATION RECORDING MEDIUM AND TWO LAYERED PHASE TRANSITION TYPE OPTICAL INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To prevent corrosion of a reflection layer and to equalize recording and reproducing characteristics and intensity of respective signals in respective recording layers, in a phase transition type optical information recording medium having two recording layers.;SOLUTION: In the phase transition type optical recording medium, a first dielectric layer, a phase transition type recording layer, a second dielectric layer and a reflective layer are laminated on a transparent first substrate in this order, the phase transition type recording layer comprises a thin layer having 5 to 16 nm film thickness and comprising mainly an alloy represented by the composition formula GexSbyTez (wherein x, y and z represent respectively an atomic %, and x, y and z satisfy respectively the following equations: 3.5≤x≤10, 70≤y≤80 and z=100-x-y) and the second dielectric layer comprises a thin film having 10 to 30 nm film thickness and comprising mainly a compound oxide of Nb₂O₅ and ZrO₂ and/or ZnO.;COPYRIGHT: (C)2006,JPO&NCIPI