Radiation imagery chemistry: process – composition – or product th – Erasable imaging
Patent
1992-12-21
1994-08-30
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Erasable imaging
430 21, 430346, 430945, 3692752, G11B 700
Patent
active
053427149
ABSTRACT:
The optical data recording media is provided on a substrate with a recording layer changing its optical characteristic dependent upon difference in the heat history, or processes of temperature elevation due to laser beam irradiation and the following cooling. The media is composed of layered structure not only varying its own reflectance or transmittance as an integrated media, but also changing the optical phase of the reflected light or transmitted light, when the optical characteristic of the recording layer is changed. In the method of recording, erasing and reproducing data using this optical data recording media, when the variations of the reflectance is to be detected, recording and erasing are effected after temporarily setting the recording layer in a state having a higher reflectance. On the other hand, when the variations of the transmittance is to be detected, recording and erasing are effected after temporarily setting the recording layer in a state having a higher transmittance. The substrate has such guide grooves that the width of either the convex portion between the guide grooves or the concave portion of the guide grooves is smaller than the diameter of the laser beam spot for reproduction.
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Nobuhiro Tokushuku et al., "High C/N Recording in Sb.sub.2 Se.sub.3 /Bi Write Once Disk", Technical Digest, International Symposium on Optical Memory 1991, Oct. 1991, Sapporo, Japan, pp. 145-146.
Bowers Jr. Charles L.
McPherson John A.
NEC Corporation
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