Optical identification system and reader for reading optical...

Details Optical identification system and reader for reading optical... Optical identification system and reader for reading optical...

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88/0.11, 352/53.

G01D 5/38 (2006.01) G02B 5/18 (2006.01) G02B 5/28 (2006.01) G02B 27/42 (2006.01) G02B 27/44 (2006.01) G06K 7/10 (2006.01) G11B 7/00 (2006.01) G11B 7/0033 (2006.01)

Patent

CA 1080523

Abstract of the Disclosure 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 imag- ing 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.

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