Cardlike optical recording medium
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United States of America Patent
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-
Jan 30, 1990
Grant Date -
N/A
app pub date -
Nov 16, 1987
filing date -
Nov 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cardlike optical recording medium comprises a substrate, a recording layer and a protective layer, wherein an ultra-hard film containing a carbon atom is provided at least on the side of said optical recording medium on which a laser beam for writing-reproducing is irradiated.
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