White level stabilization for tri-level imaging

Details White level stabilization for tri-level imaging White level stabilization for tri-level imaging

1989-04-10

1991-02-05

Pendegrass, Joan H.

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355214, 355328, 430 31, 430 42, G03G 1504, G03G 1501

Patent

active

049909550

ABSTRACT:
Stabilization of the white or background discharge voltage level of tri-level images is accomplished by monitoring photoreceptor white discharge level in the inter-document area of the photoreceptor using an electrostatic voltmeter. The information obtained thereby is utilized to control the output of a raster output scanner so as to maintain the white discharge level at a predetermined level.

REFERENCES:
patent: 3788739 (1974-01-01), Coriale
patent: 4078929 (1978-03-01), Gundlach
patent: 4855766 (1989-08-01), Suzuki

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