Image forming apparatus

Details Image forming apparatus Image forming apparatus

2008-06-03

2008-06-03

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Development

C399S343000, C399S354000

Reexamination Certificate

active

07383004

ABSTRACT:
A pulse-like DC voltage is applied from two power sources to transfer residual toner uniformizing means and toner charge amount control means, respectively, to expel transfer residual toner deposited on these means from these means onto a photosensitive drum. In a low humidity environment, the number of application of the DC voltage is increased so as to sufficiently expel the transfer residual toner because the transfer residual toner is less liable to be expelled even when the pulse-like DC voltage is applied to the above two means in the low humidity environment in which an absolute moisture content in atmosphere is small and electrical resistances at portions of a photosensitive drum contacting the above two means.

REFERENCES:
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patent: 6128461 (2000-10-01), Yoshikawa
patent: 6421512 (2002-07-01), Watanabe et al.
patent: 6560417 (2003-05-01), Rodriguez
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patent: 6952546 (2005-10-01), Yoshikawa
patent: 7099598 (2006-08-01), Dougherty et al.
patent: 2004/0175195 (2004-09-01), Kobashigawa
patent: 2001-215798 (2001-08-01), None
patent: 2003-316202 (2003-11-01), None

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