Base plate for magnetic recording disc
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United States of America Patent
Stats
-
Feb 7, 1984
Grant Date -
N/A
app pub date -
Nov 12, 1980
filing date -
Nov 14, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A base plate for magnetic recording disc is produced by coating thin metal layers containing no impurities for forming defects by an anodizing treatment on one or both sides of a discoid substrate made of a metal such as aluminum or an aluminum alloy or from a plastic by a dry process, and anodizing the thin metal layers so as to form anodized film from the surfaces of the thin metal layers to a certain depth while the portions contacting to the substrate are retained not anodized.
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