Optical reader fluorescence control

Details Optical reader fluorescence control Optical reader fluorescence control

1974-06-26

1976-03-23

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

250568, 3401463B, G06K 712

Patent

active

039462030

ABSTRACT:
A method and system for improving the signal-to-noise ratio in an automatic electro-optical reader of bar codes, wherein fluorescent ink bars arranged in coded configurations on a document are excited by a narrow band of visible radiation in the blue region of the electromagnetic spectrum, and an adjacent but not overlapping visible red region of the spectrum emanating from the ink bars is optically focused onto a light sensitive detector.

REFERENCES:
patent: 2780731 (1957-02-01), Miller
patent: 3059112 (1962-10-01), Rogal
patent: 3105908 (1963-10-01), Burkhardt
patent: 3473027 (1969-10-01), Freeman
patent: 3654463 (1972-04-01), Geusic
patent: 3812325 (1974-05-01), Schmidt
patent: 3832555 (1974-08-01), Ohnishi

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