Electrophotographic apparatus and method for inhibiting charge o

Electrophotography – Control of electrophotography process – Control of transfer

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399 14, 399314, G03G 1516

Patent

active

056970153

ABSTRACT:
Method and apparatus are provided for inhibiting toner transfer defects, and in particular, to inhibit over-transfer of electrical charge through a transfer medium to a toner after development of a latent image on a photoconductor in an electrophotographic imaging device. Toner transfer defects are inhibited near the leading edge of a print medium by a method which includes the step of providing a controlled ramped voltage output to a transfer member so as to provide a controlled flow of charge from the transfer member to the transfer medium during an initial application of electrical charge to a first region of the transfer medium adjacent a leading edge of the transfer medium. To inhibit intra-page toner transfer defects, the method of the invention includes the step of selectively activating a light source when the transfer medium is present in the nip region so as to partially discharge a portion of the photoconductor not containing a developed image when a servo voltage is below a servo threshold voltage during an image transfer.

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