Photoreceptor charging systems and methods

Details Photoreceptor charging systems and methods Photoreceptor charging systems and methods

2007-08-14

2007-08-14

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Treatment of developed image prior to transfer

C399S050000

Reexamination Certificate

active

11131319

ABSTRACT:
Embodiments herein comprise a charging station adjacent a photoreceptor. The charging station is adapted to charge the document zone of the photoreceptor with a first negative voltage and to charge the inter-document zone of the photoreceptor with a second negative voltage that is more negative than the first negative voltage. The second more negative voltage reduces the amount of positive charges trapped within layers of the inter-document zone of the photoreceptor. Thus, when the charging station increases the size of the document zone from a smaller size associated with a smaller printing medium to a larger size associated with a larger printing medium, by reducing the positive charges from being trapped within layers of the inter-document zone of the photoreceptor, ghosting is reduced on the larger printing medium.

REFERENCES:
patent: 5600413 (1997-02-01), Kimura
patent: 2002/0078241 (2002-06-01), Kumar et al.
patent: 2003/0071885 (2003-04-01), Kamoshida et al.
patent: 2003/0228177 (2003-12-01), Hirsch
patent: 2004/0218939 (2004-11-01), Motohashi et al.

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