| 摘要 |
An image forming apparatus including an image bearing member for bearing a developer image, a transfer member for electrostatically transferring the developer image onto a transfer material, a power supply for applying a voltage to the transfer member, and an electric current detector for detecting a value of an electric current which flows to the transfer member when the voltage is applied from the power supply to the transfer member. The image forming apparatus controls an output of the power supply by varying the voltage applied to the transfer member by a predetermined voltage quantity in such a manner that the electric current value detected by the electric current detector becomes a target electric current value. The predetermined voltage quantity can be varied.
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