Comparison reader for holographic identification cards

Details Comparison reader for holographic identification cards Comparison reader for holographic identification cards

1977-02-16

1978-12-26

Stern, Ronald J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 71, 356393, G03H 122, G06K 908

Patent

active

041313372

ABSTRACT:
Disclosed are a method and apparatus for verifying an identification card or the like having visible indicia thereon and also having on a portion thereof a hologram of said visible indicia as originally placed on the identification card. The method comprises the steps of: producing an optical image of the visible indicia on the identification card; producing a reconstructed image of the hologram on the identification card; projecting the optical image and the reconstructed holographic image, in superimposed register, and either continuously or intermittently, e.g., alternately, upon a common optical image plane; and comparing the images on the image plane. The apparatus comprises suitable optical elements for carrying out these steps using either a single laser light source or such a light source together with a conventional light source.

REFERENCES:
patent: 2460350 (1949-01-01), Hinman
patent: 3481673 (1969-12-01), Freeman
patent: 3560093 (1971-02-01), Montone
patent: 3669521 (1972-06-01), Tait
patent: 3743421 (1973-07-01), Maloney
patent: 3744917 (1973-07-01), Craig

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