Base plate for recording disc and a method for its manufacture
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United States of America Patent
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Jan 15, 1991
Grant Date -
N/A
app pub date -
Jan 9, 1990
filing date -
Feb 16, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Herein disclosed is a method for manufacturing a base plate for a recording disc, which comprises steps of: subjecting a base plate containing therein SiO.sub.2 -Li.sub.2 O-Al.sub.2 O.sub.3 series crystallized glass to crystallizing treatment; then polishing the surface of said base plate; and thereafter subjecting the base plate to etching treatment with use of etching agents having different rates of etching between the crystallized layer and the amorphous layer, and also a base plate for a recording disc which is produced by the method as described above.
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