Method of making an optical element mold with a hard carbon film
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United States of America Patent
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Apr 13, 1993
Issued Date -
N/A
app pub date -
Apr 10, 1991
filing date -
Aug 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This specification discloses a mold for use for press-molding an optical element, characterized in that at least the molding surface of a mold base material is coated with an a-C:H film containing 5-40 atom % of hydrogen therein and having a film density of 1.5 g/cm.sup.3 or more, and with hard carbon film containing 0-5 atom % of hydrogen therein and having a spin density of 1.times.10.sup.18 spin/cm.sup.3 or less and a film density of 1.5 g/cm.sup.3 or more.
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