Process for electrophotographic copying by transfer of electrost

Details Process for electrophotographic copying by transfer of electrost Process for electrophotographic copying by transfer of electrost

1973-07-31

1976-01-06

Klein, David

Gas separation: apparatus

Magnetic separating means

96 1R, 96 1C, 96 12, 317262A, 317262AE, 355 3R, 355 4, G03G 1318, G03G 1301, G03G 1322

Patent

active

039308502

ABSTRACT:
An electrophotographic process comprising forming an electrostatic image on the surface of a sensitive member, transferring the electrostatic image onto the surface of a transfer member, and developing the image so transferred. The process specifically involves using an overcoated sensitive member consisting essentially of an electrically conductive base, a photoconductive layer and a light-transmitting surface insulating layer, subjecting the sensitive member to a primary charging in a specific polarity using a direct current corona discharge, exposing light and dark images on the surface of the sensitive member and simultaneously subjecting it to a secondary charging until the surface of the sensitive member has the same polarity as in the primary charging and its potential becomes substantially equal to the untransferable upper limit potential, exposing the entire surface of the sensitive member to render the potential of the dark image area higher than the untransferable upper limit potential without substantially changing the potential of the light image area, transferring the electrostatic image so formed on the surface of the sensitive member to the surface of a transfer member, and then developing the electrostatic image so transferred thereby to form visible images.

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patent: 3830645 (1974-08-01), Zweig
patent: 3853553 (1974-10-01), Yasuie

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