Information storage stamper and method of manufacturing disks using the same
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United States of America Patent
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-
Sep 4, 1990
Grant Date -
N/A
app pub date -
Aug 22, 1989
filing date -
Aug 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
On a cemented carbide alloy disk or a cermet disk having been coated with either an iridium (Ir) alloy film or a ruthenium (Ru) alloy film is formed guide grooves by photography or ECR ion etching. The disk thus obtained is used as an optical or magnetic disk stamper. Next, a glass or aluminium disk is placed between a pair of stampers obtained as above and molded under pressure while heating thereby to make guide grooves of an optical or magnetic disk.
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