Apparatus and a method for testing documents

Details Apparatus and a method for testing documents Apparatus and a method for testing documents

1991-07-10

1994-01-18

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

2504581, 2504821, 235491, 356317, G06K 974, G06K 1108

Patent

active

052803333

ABSTRACT:
In an apparatus for testing documents, the optical illuminating unit comprises at least one light guide provided with fluorescent substance for directing at least two light fractions of different wavelengths onto a common area of the document. The light fractions are switched on and off by the time-division multiplex method. Special switching regulators are provided for regulating not only the switch-on and switch-off operation of the illumination sources but also the brightness thereof.

REFERENCES:
patent: 3463927 (1969-08-01), Allington
patent: 3822097 (1974-07-01), Allington

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