Method of inspecting floppy disk casing

Details Method of inspecting floppy disk casing Method of inspecting floppy disk casing

1987-12-31

1990-01-23

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

356237, G01J 142

Patent

active

048960403

ABSTRACT:
A light beam containing at least ultraviolet light in a predetermined wave range is projected onto a portion of a floppy disk casing applied with a liner, and ultraviolet light in the predetermined wave range contained in reflected light from each point on the portion of the casing is received. The intensity of the received ultraviolet light corresponding to each point is subjected to a threshold processing and whether the liner is applied to the inner surface of the casing in a satisfactory state is determined on the basis of the result of the threshold processing.

REFERENCES:
patent: 3325649 (1967-06-01), Bird
patent: 3957675 (1976-05-01), Schutt
patent: 4511800 (1985-04-01), Harbeke et al.
patent: 4542296 (1985-09-01), Kleinnibbelink et al.
patent: 4653908 (1987-03-01), Yajima et al.
patent: 4659933 (1987-04-01), Anthon
patent: 4674875 (1987-06-01), Koizumi
patent: 4752696 (1988-06-01), Matsushita et al.
patent: 4766317 (1988-08-01), Harbeke et al.
Patrick et al., "Surface Defect Analyzer" IBM Technical Disclosure, vol. 16, No. 8, Jan. 1974, p. 2694.

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