| 摘要 |
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 <?in-line-formulae description="In-line Formulae" end="lead"?>-2.0<=ln(Vtr)-L/(sxlogrho)<=-1.0<?in-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 rho(Omega/□) represents the surface resistivity of the intermediate transfer member.
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