| 摘要 |
A high-voltage power source 60 can change a set value of a current to be supplied to an electroconductive brush from a first set current that has been set when the image formation has been started, to a second set current smaller than the first set current, at a previously set timing after the image formation for a recording material has been started. An absolute value of a potential difference between potentials of a photosensitive drum 1a and an intermediate transfer belt 10, when a secondary transfer residual toner that has been charged by the electroconductive brush 16 to which the second set current has been supplied is positioned in a primary transfer portion, is not larger than an absolute value of a potential difference which is shown when a toner image formed on the photosensitive drum 1a is primarily transferred in the primary transfer portion.
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