PHASE CHANGE-TYPE OPTICAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a phase change-type optical recording medium which is as much of a high packing density and large capacity as DVD-ROM; can be not only easily initialized in an initialization process but also can secure a sufficient degree of modulation to deal with the overwrite of information in a wide range of 3.5 to 35 m/s and at a high recording linear speed; and shows outstanding recording sensitivity, overwrite characteristics and shelf stability.

SOLUTION: This phase change-type optical recording medium has a recording layer composed of at least a phase change-type recording material formed on a substrate; gives rise to a reversible phase change in the recording layer by emitting an electromagnetic wave; and thereby, can at least record/reproduce information. In this recording medium, it is characteristic that the phase change-type recording material is expressed by the composition formula: InαSbβHγGeδXε(in the formula, X is Se and/or Te; α, β, γ, δ, ε are each an atomic%, α+β+γ+δ+ε=100, 8≤α≤35, 50≤β≤85, 2≤γ≤10, 1≤δ≤5, 2≤ε≤15).

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