Read-only optical disk containing a reflective layer comprising an Al alloy containing Ta
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United States of America Patent
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Jan 4, 1994
Grant Date -
N/A
app pub date -
May 16, 1990
filing date -
May 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a read-only optical disk comprising an annulus transparent substrate of a synthetic resin having information pits thereon, a reflective layer comprising an Al alloy containing Ta and a protective layer provided thereover. The read-only optical disk according to the present invention is excellent in the corrosion resistance and has a high reliability.
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