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Device for recognizing authentic documents using optical modulas

  • US 4,922,109 A
  • Filed: 04/14/1989
  • Issued: 05/01/1990
  • Est. Priority Date: 04/18/1988
  • Status: Expired due to Term
First Claim
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1. A device for authenticating documents comprisinga reading head for optically scanning a document, said reading head including at least two substantially identical modules each of which is provided with a line of photosensors, and means for determining the spectral sensitivity of said modules,evaluation means for correlating signals provided by, said photosensors when said photosensors are illuminated with light from a light source with prestored values,conveying means for providing relative movement between said reading head and said documents, andsorting means controlled by said evaluation means in accordance with a correlation value.

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