Optical indicia marking and detection system

Details Optical indicia marking and detection system Optical indicia marking and detection system

1974-02-01

1977-03-08

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

3401463P, 340173LM, G06K 714, G06K 904, G11C 1144

Patent

active

040114350

ABSTRACT:
An optical marking system which utilizes tags that are formed from multiple diffraction gratings, which gratings differ in orientation and number of lines (frequency) in accordance with the coded information desired on the tags. A monochromatic light source illuminates a diffraction grating tag, with reading of the coded information on the tag being accomplished by sensing the reflected light which is projected as images in a Fraunhofer plane. Retroreflective elements are provided in the optic train as a means for stabilizing the direction of reflection from the diffraction gratings such that the reflections are somewhat independent of the tilt angle of the tag with respect to the illuminating light.

REFERENCES:
patent: 3305834 (1967-02-01), Cooper
patent: 3312955 (1967-04-01), Lamberts
patent: 3314052 (1967-04-01), Lohmann
patent: 3417231 (1968-12-01), Stites
patent: 3437824 (1969-04-01), Lohmann
patent: 3492660 (1970-01-01), Halverson
patent: 3552853 (1971-01-01), Sanders
patent: 3571603 (1971-03-01), Bryant
patent: 3735374 (1973-05-01), Rembault
patent: 3737877 (1973-06-01), Feinleib
patent: 3819911 (1974-06-01), Greenaway

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