Write-once-read-many optical disk

Details Write-once-read-many optical disk Write-once-read-many optical disk

1993-07-19

1994-12-06

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430495, 430945, 430275, 369288, 369284, 3692751, 3461351, G11B 7013, G03C 100

Patent

active

053709705

ABSTRACT:
A WORM optical disk that not only has a sufficiently improved reflectance to permit the setting of higher RF signal levels but that also permits the setting of higher levels for the tracking error signals to insure consistent performance in operation. This WORM optical disk of the present invention comprises a substrate 1 that has grooves 2 formed in its surface and that is coated with a dye film 3 which, in turn, is coated with a reflecting film 4, wherein the part of the dye film 3 which is formed on the lands 5 of the substrate 1 and a portion of that part of the dye film 3 which is formed in the grooves 2 are subjected to irradiation to effect color fading in the irradiated dye regions.

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