Adaptive bias control for tri-level xerography

Details Adaptive bias control for tri-level xerography Adaptive bias control for tri-level xerography

1989-04-10

1991-03-05

Pendegrass, Joan H.

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355246, 355328, 430 45, 430122, G03G 1501, G03G 1508

Patent

active

049981390

ABSTRACT:
In a tri-level imaging apparatus, a development control arrangement wherein the white discharge level is stabilized at a predetermined voltage and the bias voltages for the developer housings for charged area and discharged area development are independently adjustable for maintaining image background levels within acceptable limits. The white discharge level can be shifted to preferentially enhance the copy quality of one or the other of the charged area or discharged area images.

REFERENCES:
patent: 4078929 (1978-03-01), Gundlach
patent: 4272182 (1981-06-01), Abe et al.
patent: 4771314 (1988-09-01), Parker et al.
patent: 4855766 (1989-08-01), Suzuki

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