Method of manufacturing substrate for memory disk
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United States of America Patent
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-
May 16, 1989
Grant Date -
N/A
app pub date -
Oct 27, 1987
filing date -
Dec 28, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies, i.e. upper and lower dies each having flat compressing surface and a certain kind of textured design formed thereon within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness and simultaneously impressed texture design is obtained.
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