Device for recognizing authentic documents using optical modulas

Details Device for recognizing authentic documents using optical modulas Device for recognizing authentic documents using optical modulas

1989-04-14

1990-05-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, 25022711, 235473, G06K 500, G06K 974

Patent

active

049221094

ABSTRACT:
A recognition device for authenticating documents is disclosed. The recognition device comprises a reading head for optically scanning the documents. The reading head includes at least two modules of substantially identical construction, each of which is provided with a line of photosensors. The reading head also includes means for determining the spectral sensitivity of the modules. The recognition device also includes a conveying system for providing relative movement between the reading head and the documents being scanned. An evaluation means correlates signals provided by the photosensors with prestored values to control a sorter which sorts the documents based on their authenticity or falsehood.

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