Optical identification system and reader for reading optical gra

Registers – Calculators – Input-output calculator to indicator – printer – etc.

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3401463P, 340173LM, 350162R, 356 99, G06K 714, G06K 1906, G11C 1144, G02B 518

Patent

active

040230104

ABSTRACT:
An optical identification system including a reader for reading superimposed optical gratings on a record medium in which the reader has a grating plane and a radiant energy source for directing energy therefrom along an optical axis to the grating plane. Detectors are positioned in the reader to receive diffracted beams from the optical gratings on a record medium positioned at the grating plane. The reader also includes an optical imaging system having a concave lens for directing a zero order reflected beam which is displaced from the optical axis back to the grating plane to enable the resulting beams diffracted from the optical gratings to be received at the detectors whenever a record medium is displaced slightly from the grating plane.

REFERENCES:
patent: 1897219 (1933-02-01), Schroter
patent: 3312955 (1967-04-01), Lamberts
patent: 3437824 (1969-04-01), Lohmann
patent: 3523734 (1970-08-01), Brehm
patent: 3643216 (1972-02-01), Greenaway
patent: 3680945 (1972-08-01), Sheridon
patent: 3715733 (1973-02-01), Feiner
patent: 3754808 (1973-08-01), Clay
patent: 3814904 (1974-06-01), Russell
patent: 3838401 (1974-09-01), Graf
patent: 3894756 (1975-07-01), Ward

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