Photocopying – Contact printing – Light boxes
Patent
1990-07-02
1991-09-03
Moses, R. L.
Photocopying
Contact printing
Light boxes
355 77, 430 42, G03G 1501
Patent
active
050458930
ABSTRACT:
Apparatus and method of forming plural images, wherein the method includes the steps of: uniformly charging a charge retentive belt; discharging portions of the uniformly charged belt to form relatively high and low voltage areas of the same polarity on the belt; providing a high resolution development system; providing an electrical bias for said development system such that a relatively large development field is provided between said developer structure forming a part of the development system and the relatively low voltage; using the high resolution development system, developing the areas of relatively low voltage with first toner material contained in the developer structure; discharging portions of the relatively high voltage areas of the charge retentive belt to form areas at a voltage level intermediate the relatively high and low voltage areas; and developing the areas of high voltage level with a second toner material which is distinct and of opposite polarity from said first toner material.
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Moses R. L.
Xerox Corporation
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