Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1992-04-02
1993-09-21
Ryan, Patrick J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428457, 428913, 430945, 346 76L, 3461351, B32B 300
Patent
active
052467589
ABSTRACT:
An optical recording medium, including a substrate and a recording film disposed thereon, wherein an optical shutter layer is disposed in front of the recording film with respect to the direction of an incident reading light beam or recording light beam which is to be supplied to the optical recording medium; and the optical shutter layer comprises, as a main component, a substance having a shutter property such that the substance is in a state where it develops a color thereof until the substance is irradiated with a reading light beam, but when the substance is irradiated with the reading light beam, the substance irradiated with the reading light beam is heated up over a certain temperature so that the substance is decolored and a central portion of the optical shutter layer irradiated with the reading light beam is caused to have a light transmission.
REFERENCES:
patent: 5061582 (1991-10-01), Buettle et al.
patent: 5088086 (1992-02-01), Van et al.
Matsui Fumio
Yokogawa Fumihiko
Evans E.
Pioneer Electronic Corporation
Ryan Patrick J.
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