Apparatus and method of forming patch image for optimizing...

Details Apparatus and method of forming patch image for optimizing... Apparatus and method of forming patch image for optimizing...

2005-05-03

2005-05-03

Tran, Hoan (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S053000, C399S072000

Reexamination Certificate

active

06889015

ABSTRACT:
For optimization of a direct current developing bias Vavg, a patch image Ivn is formed whose length is longer than a circumferential length L0of a photosensitive member. From an average value of sensor outputs sampled over the length L0of the patch image, a toner density of the patch image Ivn is calculated and a value corresponding to an average value ODavg of optical densities OD is accordingly found. This cancels an influence of density variations appearing in association with rotating cycles of the photosensitive member exerted over a patch image.

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patent: 7-36231 (1995-02-01), None
patent: 2957859 (1999-07-01), None

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