Dynamic developer bias control for use in an electrostatographic

Details Dynamic developer bias control for use in an electrostatographic Dynamic developer bias control for use in an electrostatographic

1993-10-22

1995-03-28

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355246, 355261, G03G 2100

Patent

active

054022100

ABSTRACT:
A method and apparatus for providing a novel dynamic developer bias control system adapted to determine an optimal developer bias during the processing of the lead edge of an input document. Loss of image density for images on the lead edge of a document is minimized by varying the developer bias relative to variations in an optical sensor voltage signal. In addition, background development in the body of the copy sheet is further prevented by maintaining a developer bias at an elevated level in response to a determination that the lamp voltage exceeds a maximum level and the optical sensor signal is less than a predetermined target value.

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patent: 5005049 (1991-04-01), Matsushita
patent: 5266997 (1993-11-01), Nakane et al.

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