White vector feedback adjustment

Details White vector feedback adjustment White vector feedback adjustment

2008-07-08

2008-07-08

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S051000, C399S055000, C399S066000

Reexamination Certificate

active

11126814

ABSTRACT:
Control circuitry associated with an electrophotographic imaging device is adapted to operate in conjunction with a sensor to adjust a difference in electrical bias between a photoconductive surface and an associated roller. The sensor detects a reflectance or luminosity of a developed image and the control circuitry uses this detected information and information related to reflectance or luminosity of the underlying surface and the developing toner to determine whether the developed image is produced as desired. The control circuitry adjusts the difference in electrical bias between the photoconductive surface and an associated roller in response to a comparison between the detected and desired images. In one embodiment, a predetermined test pattern is developed over a range of electrical bias differences and an optimum operating point is determined from the iterations.

REFERENCES:
patent: 5477312 (1995-12-01), Hori
patent: 6560418 (2003-05-01), Campbell et al.
patent: 2005/0063718 (2005-03-01), Oki

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