Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1997-10-28
1999-05-04
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430945, 427162, 3692752, 3692755, 428 646, G11B 724
Patent
active
059003472
ABSTRACT:
An optical information recording medium includes a transparent substrate, a first dielectric layer, a recording layer, a second dielectric layer, a reflecting layer, and a third dielectric layer. The substrate constitutes an optical disk for performing a mark edge recording operation. The first dielectric layer is formed on the substrate. The recording layer is formed on the first dielectric layer and is irradiated with a laser beam to undergo a reversible phase change between a crystalline state and an amorphous state, thereby recording and erasing information. The recorded information is reproduced by detecting a change in optical characteristics accompanying a phase change of the recording layer. The second dielectric layer is formed on the recording layer. The first and second dielectric layers protect the recording layer. The reflecting layer is formed on the second dielectric layer and has a predetermined transmittance The third dielectric layer is formed on the reflecting layer and has a thickness set to control a relationship between an absorbance Ac of the recording layer in the crystalline state and an absorbance Aa in the amorphous state according to Ac>Aa. The dielectric layer is made of a dielectric material having a refractive-index n larger than 1.5.
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Angebranndt Martin
NEC Corporation
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