Magnetic disk inspection apparatus

Details Magnetic disk inspection apparatus Magnetic disk inspection apparatus

1991-07-16

1993-08-24

Noland, Tom

Measuring and testing

Surface and cutting edge testing

Roughness

G01B 2130, G01B 734

Patent

active

052378616

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.

REFERENCES:
patent: 3504552 (1970-04-01), Hiller
patent: 3724626 (1973-05-01), Roberts et al.
patent: 4560924 (1985-12-01), Nordberg
patent: 4802042 (1989-01-01), Strom
patent: 4811594 (1989-03-01), Dvorsky
patent: 4829249 (1989-05-01), Matsushita et al.
patent: 4879672 (1989-11-01), Pombrio, Jr.

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