Magnetic disk inspection apparatus
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United States of America Patent
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-
Aug 24, 1993
Grant Date -
N/A
app pub date -
Jul 16, 1991
filing date -
Jul 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic disk inspection apparatus for inspecting protuberance on a surface of the magnetic disk. The apparatus includes an inspection head detecting the protuberance by a piezosensor, and rotating speed control circuit controlling a rotating speed of the magnetic disk held by a rotary holder member. The rotating speed control circuit generates a different speed increasing rate for each of concentric zones formed by dividing into a plurality of sections in a radial direction of the magnetic disk to keep a floating height of the inspection head in a predetermined constant value.
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