Optical disk with glass substrate and method of producing same
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United States of America Patent
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Jul 7, 1992
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N/A
app pub date -
Apr 18, 1991
filing date -
Sep 29, 1987
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Abstract
An optical disk with a substrate made of glass at least partially has its inner and outer peripheral surfaces polished to surface roughness of 5 .mu.m or less so as to reduce the amount of glass powder generated from these surfaces and to thereby improve the yield.
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