Contact charging image forming apparatus having improved image t

Details Contact charging image forming apparatus having improved image t Contact charging image forming apparatus having improved image t

1996-03-13

1998-01-13

Lee, S.

Electrophotography

Image formation

Combined or plural functions by single component

399175, 399313, 399314, G03G 1530, G03G 1516

Patent

active

057089299

ABSTRACT:
In an image forming apparatus, when a transferred material exists in a transfer position between a photoreceptor drum and a transfer unit during an image forming operation, a transfer voltage, which has opposite polarity to that of a voltage applied to a brush charger and is used for transferring a developer image on the photoreceptor drum onto the transferred material is applied to the transfer unit. Meanwhile, when a transferred material does not exist in the transfer position during the image forming operation, a non-transfer voltage, which is lower than the transfer voltage, is applied to the transfer unit. As a result, defects on an image due to returning of a developer from the brush charger to the photoreceptor drum can be prevented from being generated.

REFERENCES:
patent: 5182604 (1993-01-01), Asai
patent: 5337127 (1994-08-01), Imaue
patent: 5371578 (1994-12-01), Asono et al.
patent: 5420668 (1995-05-01), Okano
patent: 5438397 (1995-08-01), Okana et al.

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