Electrophotographic image-forming apparatus using...

Details Electrophotographic image-forming apparatus using... Electrophotographic image-forming apparatus using...

2005-10-11

2005-10-11

Grimley, Arthur T. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S030000, C399S050000, C399S053000, C399S058000, C399S059000

Reexamination Certificate

active

06954597

ABSTRACT:
An electrophotographic image-forming apparatus and method using a two-component developer comprises a charging roller for charging a surface of a photosensitive medium at a predetermined potential; a developing unit for developing an electrostatic latent image formed on the photosensitive medium; a control unit for determining a developing bias voltage to be applied to a developing roller in relation to a print density level selected by a predetermined selection unit out of a plurality of print density levels set in varying degrees, calculating a surface potential of the photosensitive medium charged by the charging roller, and controlling a charging voltage to be applied to the charging roller in order that an absolute value of a potential difference between the determined developing bias voltage and calculated surface potential becomes higher than a predetermined potential; and a charging voltage adjustment unit for variably adjusting the charging voltage to be applied to the charging roller.

REFERENCES:
patent: 6330405 (2001-12-01), Ishii et al.
patent: 6760553 (2004-07-01), Mitsuya et al.
patent: 6845222 (2005-01-01), Takai
patent: 02091664 (1990-03-01), None
patent: 05210288 (1993-08-01), None
patent: 1999011499 (1999-02-01), None
patent: 2002070589 (2002-09-01), None

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