Information recording medium
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 15, 1992
Grant Date -
N/A
app pub date -
Dec 28, 1989
filing date -
Dec 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an optical information recording medium, a protective layer containing a material not reacting with an active layer is disposed, and the composition ratio of this protective layer is designed so as to increase the amount of the material not reacting with the active layer near the border contacting with the active layer, so that degradation of the active layer is prevented. In this construction, the stability is maintained after repetition of recording and erasing cycles over 1 million times.
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Cited Art Landscape
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