READ ONLY OPTICAL INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a read only optical information recording medium equipped with a reflection film having high reflectance, exhibiting not only excellent environment resistance when held under conditions of high temperature and high humidity but also excellent light resistance when held under a condition of irradiation with light of high intensity and having repetitive reproduction durability to a repetitive reproduction test.

SOLUTION: The read only optical information recording medium has the reflection film and a light transmission layer which are sequentially layered at least one layer for each on a substrate, wherein the reflection film comprises Ag based alloy containing 0.01 to 1.0 at.% Bi and 0.1 to 13.0 at.% Cu.

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