Substrate for magnetic disk memory and production process
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United States of America Patent
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-
Mar 27, 1990
Grant Date -
N/A
app pub date -
Feb 3, 1988
filing date -
Feb 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Substrate for magnetic disk memory and production process. The substrate comprises an aluminium wafer (10) and two plastic sheets (39,41) pressed hot against the wafer. The outer faces (38,40) have a good flatness or smoothness, as a result of the surface state of the pressing plates. Application to the production of substrates used in the manufacture of disks for magnetic recording purposes.
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