| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus designed such that a bias having the same polarity as toner is applied while a leak is prevented between bias application electrodes in a primary transfer nip, thus transfer dust or reversal transfer in the primary transfer are prevented, in addition, an electric field that prevents transfer of toner from an intermediate transfer belt to the recording medium is applied to the adhesion failure area between an intermediate transfer belt and recording medium, which is further upstream of a secondary transfer nip on the intermediate transfer belt, thus, pre-transfer and transfer dust are prevented in secondary transfer. SOLUTION: The image forming apparatus 100 applies a bias having the same polarity as the regular charge polarity of toner by a bias application member in a position further backward than a primary transfer bias application device. In addition, the apparatus 100 starts the contact of a recording medium with a toner image on a primary transfer belt 10 in a position further forward than the secondary transfer nip. Also, the apparatus 100 includes an electrode that forms an electric field for enhancing electrostatic attraction between the regular charge polarity toner and the primary transfer belt 10 in the contact start part. COPYRIGHT: (C)2007,JPO&INPIT
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