Photocopying – Contact printing – Light boxes
Patent
1993-02-05
1994-03-01
Braun, Fred L.
Photocopying
Contact printing
Light boxes
346157, 355326R, 380 54, 380 55, G03G 2100, G09C 500
Patent
active
052912434
ABSTRACT:
A system for printing security documents which have copy detection or tamper resistance in plural colors with a single pass electronic printer printing an integrated image controlled by an image generation system which electronically generates a safety background image pattern with first and second interposed color patterns which is electronically merged with alphanumeric information and a protected signature into an integrated electronic image for the printer. The single pass printer preferably has an imaging surface upon which two latent images thereof are interposed, developed with two differently colored developer materials, and simultaneously transferred to the substrate in a single pass. The color patterns are preferably oppositely varying density patterns of electronically generated pixel dot images with varying spaces therebetween. Preferably a portion of the alphanumeric information is formed by a special secure font, such as a low density shadow copy. The validating signature also preferably has two intermixed color halftone patterns with halftone density gradients varying across the signature in opposite directions, but differently from the background. Also electronically superimposed in the safety background pattern may be substantially invisible latent image pixel patterns which becomes visible when copied, and/or are machine readable even in copies.
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Heckman Dean A.
Qureshi Irshad H.
Tuttle Steven R.
Braun Fred L.
Xerox Corporation
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