| 摘要 |
PROBLEM TO BE SOLVED: To prevent an excessive electric charge from being imparted to the rear end of a transfer material at the time of transferring a toner image on a photoreceptive drum to the transfer material by a transfer roller. SOLUTION: In an image forming apparatus possessing at least an image carrier carrying an image to be transferred to the transfer material and a member for transfer to form a transfer nip part through which the transfer material passes by coming into contact with the image carrier and to transfer the image carried by the image carrier to the transfer material by applying transfer bias to the member for transfer, the transfer bias is set as constant voltage control (Vt) until the transfer material passes through the transfer nip part and reaches the rear end and is switched to constant current control (I) at the rear end. COPYRIGHT: (C)2004,JPO
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