Photocopying – Contact printing – Light boxes
Patent
1994-12-12
1996-07-16
Smith, Matthew S.
Photocopying
Contact printing
Light boxes
355208, 355246, 355326R, G03G 2100
Patent
active
055371906
ABSTRACT:
A method and apparatus for achieving optimum optical contrast for detecting registration marks in a multicolor print black first color electrophotographic printing machine. A black mask having voids in the shape of a registration mark is formed on the photoreceptor. A high contrast color is then overwritten on the mask forming marks which indicate the position of the black image. A second method utilizes only the first recharge unit and the last developer unit. A registration mark is imaged by each imager and all of the latent image registration marks are developed with a single color high contrast toner. A sensor is then used to determine the relative position of the various color imagers and to send signals to the controller to make appropriate corrections.
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Costanza Daniel W.
Folkins Jeffrey J.
Kepner Kevin R.
Smith Matthew S.
Xerox Corporation
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