Optical mark recognition apparatus

Details Optical mark recognition apparatus Optical mark recognition apparatus

1983-06-06

1986-08-05

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

235455, 235469, 250555, 250566, 356 71, 356445, G01J 346, G06K 712

Patent

active

046039767

ABSTRACT:
In optical mark recognition apparatus the light transmitter has two light sources 11, 12 which can be selectively switched on and which transmit light beams of different spectral compositions. A semi-permeable mirror 15 directs the light beams 13, 14 of both light sources 11, 12 along a common optical path 16 (FIG. 1).

REFERENCES:
patent: 3225177 (1965-12-01), Stites et al.
patent: 3632993 (1972-01-01), Acker
patent: 3684868 (1972-08-01), Christie et al.
patent: 3814943 (1974-06-01), Baker et al.
patent: 3922090 (1975-11-01), Fain
patent: 3972616 (1976-08-01), Minami et al.
patent: 4299443 (1981-11-01), Minami et al.
Roberts, "Optimized Tape Mark Detector", IBM Technical Disclosure, vol. 12, No. 12, May 1970, pp. 2354-2355.
Kosanke et al, "Compensator for Light Deflector", IBM Tech. Dis., vol. 10, No. 1, Jun. 1967, p. 58.

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