IMAGE FORMATION APPARATUS HAVING INTERMEDIATE TRANSFER...

Details IMAGE FORMATION APPARATUS HAVING INTERMEDIATE TRANSFER... IMAGE FORMATION APPARATUS HAVING INTERMEDIATE TRANSFER...

2005-10-18

2005-10-18

Lee, Susan (Department: 2852)

Electrophotography

Image formation

Transfer

Reexamination Certificate

active

06957033

ABSTRACT:
An image formation apparatus has an image formation unit that forms toner images on an image holding member. A primary transfer unit transfers toner images on the image holding member onto an intermediate transfer member. A secondary transfer unit transfers toner images on the intermediate transfer member onto a recording medium. An electrically-grounded contact member first comes into contact with the intermediate transfer member downstream from a primary transfer portion. The relationshipin-line-formulae description="In-line Formulae" end="lead"?−2.0≦ln(Vtr)−L/(s×logρ)≦−1.0in-line-formulae description="In-line Formulae" end="tail"?is satisfied, in which L (mm) represents the distance from the primary transfer portion to a position where the intermediate transfer member first comes into contact with the contact member, Vtr (V) represents the absolute value of applied voltage to the primary transfer unit, s (mm/sec) represents the moving speed of the intermediate transfer member, and ρ(Ω/□) represents the surface resistivity of the intermediate transfer member.

REFERENCES:
patent: 6088567 (2000-07-01), Miyashiro et al.
patent: 6192205 (2001-02-01), Motohashi
patent: 6226469 (2001-05-01), Suzuki et al.
patent: 6298212 (2001-10-01), Kono et al.
patent: 6477340 (2002-11-01), Tomizawa et al.
patent: 10-142953 (1998-05-01), None
patent: 2000-298408 (2000-10-01), None

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