Electrophotography – Supplemental electrophotographic process – Exposure or charging
Reexamination Certificate
2006-04-03
2009-12-01
Gray, David M (Department: 2852)
Electrophotography
Supplemental electrophotographic process
Exposure or charging
C399S149000, C399S150000
Reexamination Certificate
active
07627269
ABSTRACT:
An image forming apparatus includes an image bearing member; a charging member for contacting a peripheral surface of the image bearing member to electrically charge the peripheral surface; a first developing device for forming a first developed image on the peripheral surface of the image bearing member charged by the charging member; a second developing device for forming a second developed image on the peripheral surface, wherein a combined developed image is formed by superimposing the first developed image and the second developed image on a common transfer material, wherein when the combined image is being formed, the charging member is cleaned by transferring, by an electric field, material deposited on the charging member to a region between the first developed image and the second developed image on the peripheral surface of the image bearing member, and wherein the first developed image and the second developed image are not formed in the region.
REFERENCES:
patent: 5732310 (1998-03-01), Hiroshima et al.
patent: 6006055 (1999-12-01), Furuya
patent: 2004/0223784 (2004-11-01), Nakahara et al.
patent: 07-219313 (1995-08-01), None
patent: 2003-302816 (2003-10-01), None
Kojima Katsuhiro
Matsuda Kenji
Matsuguma Minoru
Matsumoto Hideki
Ojima Masaki
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Gray David M
Ready Bryan P
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