Optical disc with corrosion-resistant metallic reflective layer
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United States of America Patent
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-
Apr 25, 1995
Grant Date -
N/A
app pub date -
Sep 11, 1992
filing date -
Sep 25, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical disc for use as a compact disc, an optical video disc, or the like has a disc substrate of a light-transmissive material such as polycarbonate, PMMA, or the like. The disc substrate has a pattern of pits and lands formed as representing an information signal on at least one surface thereof. A thin reflective layer of a-corrosion-resistant metallic material such as an alloy of Fe, Ni, and Co is deposited on the disc substrate over the pattern of pits and lands. The optical disc is relatively inexpensive to manufacture as no protective layer needs to be deposited on the reflective layer and is also highly resistant to loss of performance with aging because the reflective layer is made of a corrosion-resistant metallic material.
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