Optical scanning apparatus for detecting faults on a surface

Details Optical scanning apparatus for detecting faults on a surface Optical scanning apparatus for detecting faults on a surface

1988-10-28

1990-05-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356431, G01N 2189

Patent

active

049240862

ABSTRACT:
An optical scanning apparatus for plane surfaces (13) having a laser light source (20), a light deflecting means (16) illuminated by the laser beam, a telecentric image forming element (15) and a light receiving means. Parallel to the scanning line (11) generated by the light deflecting means (16) and the telecentric image forming element (15) there is arranged, at the angle of regular reflection, an image forming retroreflector (12; 38,39) which forms an image of the light bead running along the scanning line (11) on itself.

REFERENCES:
patent: 4025796 (1977-05-01), Erdmann
patent: 4326799 (1982-04-01), Keene et al.
patent: 4402609 (1983-09-01), Fetzer et al.
patent: 4775238 (1988-10-01), Weber

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