Electro-photographic image forming apparatus and method for...

Details Electro-photographic image forming apparatus and method for... Electro-photographic image forming apparatus and method for...

2006-05-31

2008-12-09

Lee, Susan S (Department: 2852)

Electrophotography

Control of electrophotography process

Control of charging

C399S044000, C399S176000

Reexamination Certificate

active

07463840

ABSTRACT:
Provided is an electro-photographic image forming apparatus and a method of determining a charging voltage thereof. The electro-photographic image forming apparatus includes: a charge roller for supplying a voltage of a predetermined level to a photoconductor; a transfer roller for transferring a developed image to a printing media by using a developer; a high voltage power supply for supplying a charging voltage at a preset level and a transfer voltage at a preset level to the charge roller and the transfer roller, respectively; and a controller for predicting a charged electric potential deviation based on the transfer voltage to be supplied by the high voltage power supply and for determining a charging voltage level to correct for the predicted charged electric potential deviation. Therefore, the deviation of the charged electric potential caused by the transfer voltage is prevented.

REFERENCES:
patent: 5450180 (1995-09-01), Ohzeki et al.
patent: 06-161294 (1994-06-01), None
patent: 1999-083280 (1999-11-01), None
patent: 1020000014941 (2000-03-01), None
patent: 1020010038693 (2001-05-01), None

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