Electrophotography – Image formation – Transfer
Reexamination Certificate
2005-12-06
2008-03-25
Ngo, Hoang (Department: 2852)
Electrophotography
Image formation
Transfer
C399S066000, C399S082000, C399S303000
Reexamination Certificate
active
07349658
ABSTRACT:
An image forming apparatus includes a plurality of photosensitive drums, a plurality of developing devices, an intermediate transfer medium, primary transfer members, and a secondary transfer member for transferring toner images onto a transfer material. A full-color mode and a monocolor mode are selectively carried out. The image forming apparatus also includes a CPU for adjusting the length of a non-image forming region, and an intermediate-transfer-medium movement controller. The CPU brings about a switching state in which an image forming region lies between a primary transfer position on the most downstream one of the photosensitive drums and a secondary transfer position and in which non-image forming regions simultaneously lie at the primary transfer position and at the secondary transfer position. The intermediate-transfer-medium movement controller switches between the full-color mode and the monocolor mode during the switching state.
REFERENCES:
patent: 6738594 (2004-05-01), Nakagawa et al.
patent: 6963715 (2005-11-01), Kanekura
patent: 2004-4398 (2004-01-01), None
Nishizawa Yuki
Ogata Hiroaki
Teshima Eiichiro
Canon Kabushiki Kaisha
Canon U.S.A. Inc I.P. Div
Ngo Hoang
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