Fitzpatrick, Cella, Harper & Scinto
IMAGE FORMATION APPARATUS HAVING INTERMEDIATE TRANSFER MEMBER AND ELECTRICALLY GROUNDED CONTACT MEMBER DISPOSED IN CONTACT WITH INTERMEDIATE TRANSFER MEMBER BETWEEN PRIMARY TRANSFER PORTION AND SECONDARY TRANSFER PORTION
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 relationship−2.0≦ln(Vtr)−L/(s×logρ)≦−1.0is 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.
Canon Kabushiki Kaisha
G G
G03G G03G
inventional additional
Makoto Takeshi
Saito Tomizawa