Color mark sensor

Details Color mark sensor Color mark sensor

1987-11-09

1988-11-08

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, 250557, G06K 7015

Patent

active

047835915

ABSTRACT:
A color mark sensor utilizing the cumulative chromatic aberration in an extended planar gradient-index (GRIN) lens to provide unambiguous primary color separation in a continuum along the lens axis. An appropriately chosen GRIN lens length provides separation and focus of any primary color from the general polychromatic background.

REFERENCES:
patent: 3185021 (1965-05-01), Thompson
patent: 3784832 (1974-01-01), Sewell
patent: 3867039 (1975-02-01), Nelson
patent: 4068734 (1978-01-01), Foeller
patent: 4379636 (1983-04-01), Yoshida
patent: 4624571 (1986-11-01), Salda et al.
patent: 4649271 (1987-03-01), Hok et al.
patent: 4687925 (1987-08-01), Huggins

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