Patent ID: 6811949
Filing Date: 2004-11-02
Classification: G11B,Y10S,Y10T

Abstract:
An optical information recording medium having a multilayer structure comprising at least a lower protective layer, a phase-change type optical recording layer, an upper protective layer and a reflective layer, on a substrate, for overwrite recording by modulation of light intensity of at least two levels, so that a crystalline state is an unrecorded state, and an amorphous state is a recorded state, whereinthe phase-change type optical recording layer has a composition of ZnzGey(SbxTe1âˆ’x)1âˆ’yâˆ’z, where 0.65&lE;x&lE;0.85, 0.01&lE;y&lE;0.20, and 0.01&lE;z&lE;0.15, and comprises as the main component, an SbTe alloy of the Sb70Te30 eutectic composition or a composition including an excess amount of Sb over the Sb70Te30 eutectic composition.