Method for determining proper bias voltage for transferring...

Details Method for determining proper bias voltage for transferring... Method for determining proper bias voltage for transferring...

2006-07-04

2006-07-04

Brase, Sandra I. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

Reexamination Certificate

active

07072598

ABSTRACT:
A system and method for determining, during a pre-rotation period, a proper transfer bias for colors, e.g. YMCK. These proper transfer bias voltages are applied to a primary transfer roller, which enables proper transfer of color images from a photoconductive drum. Four exposure bias voltages for each of YMCK are determined. The first exposure bias voltage for Y is applied to the photoconductive drum, while three predetermined voltages are applied to a primary transfer roller in order to obtain corresponding currents and a voltage/current relationship thereof, from which a proper transfer bias voltage for Y is determined. For all subsequent colors, a proper transfer bias voltage for each subsequent color is determined by employing the Y exposure bias voltage and the exposure bias voltage for each the subsequent colors, MCK. In an exemplary embodiment, it is noted that the proper transfer voltages are obtained during pre-rotation in which the primary transfer roller rotates no more than three times.

REFERENCES:
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patent: 5953572 (1999-09-01), Takeuchi et al.
patent: 6253038 (2001-06-01), Ito et al.
patent: 6404999 (2002-06-01), Shoji et al.
patent: 2002/0106210 (2002-08-01), Oki
patent: 5-6112 (1993-01-01), None
patent: 10-133495 (1998-05-01), None

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