Color image forming apparatus with pre-secondary transfer...

Details Color image forming apparatus with pre-secondary transfer... Color image forming apparatus with pre-secondary transfer...

2006-11-21

2009-12-29

Royer, William J (Department: 2852)

Electrophotography

Image formation

Treatment of developed image prior to transfer

Reexamination Certificate

active

07639974

ABSTRACT:
A color image forming apparatus for forming a color image onto a transfer material by superimposing a plurality of unicolor toner images. The apparatus makes it possible to produce a high quality image through a secondary transferring operation with a good secondary transferring efficiency. At a pre-secondary transfer charge eliminating section, an electric potential difference between a grid electrode disposed at an upstream side and an opposing electrode is set at such a value that is greater than that between a grid electrode disposed at a downstream side and an opposing electrode.

REFERENCES:
patent: 5999783 (1999-12-01), Folkins
patent: 7298997 (2007-11-01), Hamada et al.
patent: 7346302 (2008-03-01), Sato et al.
patent: 7440719 (2008-10-01), Kimura et al.
patent: 10-274892 (1998-10-01), None
patent: 11-143255 (1999-05-01), None

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