Transfer device and image forming apparatus

Details Transfer device and image forming apparatus Transfer device and image forming apparatus

2008-04-22

2008-04-22

Tran, Hoan (Department: 2852)

Electrophotography

Image formation

Transfer

C399S167000, C399S308000

Reexamination Certificate

active

11118409

ABSTRACT:
In a transfer device, a driving roller that rotationally drives a belt member satisfies a condition “(R2−R1)π×(s−1)×p/(R1×π×2)≦0.15 millimeter”, where R1is a diameter of the driving roller under an environment of a minimum temperature and a minimum moisture in a use environment range designed, R2is a diameter of the driving roller under an environment of a maximum temperature and a maximum moisture in the use environment range at design, p is an arrangement pitch of the transfer units, s is a total number of the transfer units, and π is the circle ratio pi.

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