Universal document validator

Details Universal document validator Universal document validator

1983-05-16

1986-05-13

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

209534, 250556, 356 73, 356435, 364571, G06K 974, G01N 2159, G01N 2186

Patent

active

045882924

ABSTRACT:
An improved universal document validator in which a document is transported along a path past light detectors and associated light sources positioned above and below the path, such that light from the sources is directed toward the path and reflected onto the detectors to produce outputs therefrom. A first stored value representing the desired output of each detector with no document in the transport path and with its associated light source illuminated is divided by the actual output of each detector with no document in the transport path and with its associated light source illuminated, to produce a plurality of quotients. If any of the quotients falls outside a predetermined range, the validator turns itself off. A microprocessor control system uses the outputs of the detectors with a document in the transport path together with the quotients to produce an indication of the validity of the document.

REFERENCES:
patent: 4097732 (1978-06-01), Krause et al.
patent: 4255057 (1981-03-01), Williams
patent: 4429991 (1984-02-01), Williams
patent: 4482058 (1984-11-01), Steiner
patent: 4486098 (1984-12-01), Buchegger et al.
patent: 4542829 (1985-09-01), Emery et al.

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