Method of inspecting magnetic disk surface

Details Method of inspecting magnetic disk surface Method of inspecting magnetic disk surface

1987-05-04

1988-12-06

Willis, Davis L.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250563, 250572, 356431, G01N 2189

Patent

active

047892382

ABSTRACT:
In a method of inspecting a magnetic disk surface, a magnetic disk web is exposed to a light beam, information on the condition of reflection of the light beam by the magnetic disk web or passing of the light beam through the magnetic disk web is detected, and the condition of surface defects of a magnetic disk is judged based on results obtained by the detected information. The judgement is carried out based on the results at a portion of the magnetic disk web outside of a non-use region of the magnetic disk.

REFERENCES:
patent: 3274390 (1966-09-01), Umbel
patent: 3646353 (1972-02-01), Bhullar et al.
patent: 4652124 (1987-03-01), Bowen et al.

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