Image forming apparatus

Details Image forming apparatus Image forming apparatus

2008-04-15

2008-04-15

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Transfer

C399S299000, C399S306000, C399S308000

Reexamination Certificate

active

07359663

ABSTRACT:
An image forming apparatus has a plurality of developing units for developing toner images of different colors, an intermediate transfer belt for transferring the toner images of the respective colors onto a surface of the belt or onto a recording sheet transported over the belt surface, a first or drive roller for driving the belt while the belt is wound around the first roller, a second or driven roller and a tension roller, which is driven along with the driving of the belt driven by the first roller. The image forming apparatus satisfies a relation defined by the following equation:in-line-formulae description="In-line Formulae" end="lead"?D2=N·D1in-line-formulae description="In-line Formulae" end="tail"?where D1is a belt-inclusive outer diameter of the first roller where the belt is wound, including the thickness t of the belt, D2is an outer diameter of the second roller, and N=n or 1
where n is a positive integer.

REFERENCES:
patent: 5619310 (1997-04-01), Todome
patent: 6546220 (2003-04-01), Asakura et al.
patent: 2003/0086732 (2003-05-01), Abe et al.
patent: 2004/0184828 (2004-09-01), Bannai et al.
patent: 2005/0249524 (2005-11-01), Matsuda et al.
patent: 10-339984 (1998-12-01), None

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