Write-once-read-many optical disk
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United States of America Patent
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Dec 6, 1994
Issued Date -
N/A
app pub date -
Jul 19, 1993
filing date -
Jun 6, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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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