Image forming apparatus and image forming method

Details Image forming apparatus and image forming method Image forming apparatus and image forming method

2009-06-04

2011-10-04

Lee, Susan (Department: 2884)

Electrophotography

Control of electrophotography process

Control of developing

Reexamination Certificate

active

08032043

ABSTRACT:
In case new and old toners may be mixed, a developing bias is set as follows. The time is first clocked. The number of times toner is replenished from a hopper into a buffer for a clocked period is counted. If a replenishment amount per clock time is a threshold value or higher, considering that new and old toners are mixed, the setting of the developing bias is changed. An electric field intensity between a developing roller and a photoconductor is set to cause normally-charged toner to fly in an image area but not to fly in a background area. No image fogging is therefore generated in the background area. Thus, an image forming apparatus and method capable of preventing low-charged toner and oppositely-charged toner generated by mixing of new and old toners from adhering to the background area of an electrostatic latent image on the photoconductor, thereby avoiding generation of image fogging.

REFERENCES:
patent: 2004/0005160 (2004-01-01), Kawamura et al.
patent: 2000-122411 (2000-04-01), None
patent: 2001-075341 (2001-03-01), None
patent: 2005-055468 (2005-03-01), None
patent: 2006-285201 (2006-10-01), None
Decision of Grant issued Apr. 13, 2010 in the corresponding Japanese Patent Application No. 2008-158467 and an English translation thereof.

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