Optical authentication device

Details Optical authentication device Optical authentication device

1992-04-23

1994-03-22

Bell, Janyce

Optical: systems and elements

Holographic system or element

Authentication

359 31, 359 32, 359 33, 359567, 359576, 427 7, 427162, G03H 122, B41F 112

Patent

active

052969495

ABSTRACT:
An optical device for receiving incident light having a minimum wavelength, and for producing a resultant light containing an optical image. The device includes a first material having a first index of refraction and a surface embossed with an optical interference pattern, and a second material having a second index of refraction deposited onto the embossed surface of the first material. The depth of deposition is at least equal to three quarters of the minimum wavelength component of the incident light within the second material.

REFERENCES:
patent: 4033059 (1977-07-01), Hutton et al.
patent: 4315665 (1982-02-01), Haines
patent: 4522670 (1985-06-01), Caines
patent: 4662653 (1987-05-01), Greenaway
patent: 4840444 (1989-06-01), Hewitt
patent: 4892385 (1990-01-01), Webster

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