Optical key security access system

Details Optical key security access system Optical key security access system

1992-02-04

1994-02-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235382, 235487, G06K 710, G03H 126

Patent

active

052834310

ABSTRACT:
An access security system employs a non-duplicatable key made from an optically transmissive material having gradient refractive index and diffusive properties which provide the material with a non-duplicatable quality. The system provides a high level of security comparable to many biometric systems and is well suited for use in the prevention of unauthorized access to high security areas.

REFERENCES:
patent: 3797936 (1974-03-01), Dimitriadis
patent: 4189712 (1980-02-01), Lemelson
patent: 4257030 (1981-03-01), Bruhin et al.
patent: 4837425 (1989-06-01), Edwards
patent: 4853524 (1989-08-01), Yamaguchi et al.
patent: 5043593 (1991-08-01), Tsutsumi et al.

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