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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsEiji Ohno, Noboru Yamada, Kenichi Nagata, Kenichi Nishiuchi, Nobuo Akahira
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An optical information recording medium comprising a substrate, and a dielectric layer, a recording layer, a dielectric layer and a reflective layer which are laminated on the substrate in this order or a reflective layer, a dielectric layer, a recording layer and a dielectric layer which are laminated on the substrate in this order, wherein the recording layer comprises alternately laminated at least two optically active layers and at least one amorphous-acceleration layer; each of the optically active layers having a thickness of from 1 nm to 10 nm; the thickness d.sub.1 of each of the optically active layers and the thickness d.sub.2 of the amorphous-acceleration layer satisfying the equation: 1/3.ltoreq.d.sub.1 /d.sub.2 .ltoreq.3.
An optical information recording medium comprising a substrate, and a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, or a dielectric layer,a recording layer, a dielectric layer and a reflective layer which are laminated on said substrate in this order, or a reflective layer, a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, wherein said recording layer comprises alternately laminated at least two optically active layers the state of each of which is reversibly changed between optically recognizable states by irradiation and at least one amorphous-acceleration layer comprising a dielectric material, each of said optically active layers having a thickness of from 1 nm to 10 nm, and wherein the thickness d.sub.1 of each of said optically active layers and the thickness d.sub.2 of said amorphous-acceleration layer satisfy the equation:
Dependencies are inferred from the claim text.