Method of transferring electrostatic images to a dielectric sheet wherein a reversal of potential is used to clear background areas
Abstract
Abstract THE BACKGROUND DENSITY OF A TONED ELECTROSTATIC IMAGE PATTERN PRODUCED ON A RECEIVER SHEET IS REDUCED BY PLAXING A RECEIVER SHEET COMPRISING AN INSULATING COATING ON A CONDUCTIVE LAYER, IN FACE-TO-FACE CONTACT WITH A PHOTOCONDUCTIVE ELEMENT; EXPOSING THE ELEMENT TO A PATTERN OF ACTINIC RADIATION WHILE AN ELECTRICAL POTENTIAL IS APPLIED BETWEEN THE RECEIVER AND PHOTO-CONDUCTIVE ELEMENT; AND MOMENTARILY REVERSING THE POLARITY OF THE APPLIED POTENTIAL UPON TERMINATION OF THE EXPOSURE. IF THE POTENTIAL OF THE REVERSED POLARITY IS PROPERLY SLEECTED, AN ELECTROSTATIC IMAGE WILL BE PRODUCED HAVING ONE POLARITY. ALSO, EITHER A POSITIVE OR NEGATIVE POLARITY CAN BE USED AT THE START OF THE PROCEDURE SO THAT POSITIVE PRINTS CAN BE MADE FROM EITHER A NEGATIVE OR POSITIVE ORIGINAL.
Inventors
- 👤 Gene H Robinson
Bibliographic Details
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