System for inspecting bearing balls for defects

Details System for inspecting bearing balls for defects System for inspecting bearing balls for defects

1989-10-12

1991-04-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356446, G01N 2188

Patent

active

050121162

ABSTRACT:
By deriving the image formed by light specularly-reflected from substantially all of the convex (mirror-like) spherical surface of a bearing ball under test that is being illuminated with diffuse light, any defect in the bearing ball under test reveals itself as a light-contrast pattern in the otherwise substantially uniform diffuse background of the image.

REFERENCES:
patent: 4227809 (1980-10-01), Satoh et al.
patent: 4259013 (1981-03-01), Faxvog et al.
patent: 4555635 (1985-11-01), Yoshida
R. L. Lewis "Optical Scanners for Ball Bearing Inspection" Optical Engineering Jan./Feb. 1982, pp. 113-117.

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