| 摘要 |
An image forming apparatus includes a belt (131) to transfer a printing medium, a plurality of support rollers (133,135) which rotatably support the belt (131), a photosensitive medium (145Y) which has a surface on which a visible toner image is formed by charged toner, a transfer roller (151) which is disposed adjacent to the photosensitive medium (145Y) with the belt (131) interposed therebetween, a power supplying part (170) which supplies power to the transfer roller (151) so that a surface of the transfer roller has an electrical potential, and a control part (190) which controls the power supplying part (170) to supply a pulse power to the transfer roller (151) of, on average, the same polarity as the polarity of the charged toner, so that the charged toner remaining on the belt (131) after the belt (131) transfers the printing medium past the photosensitive medium (145Y) is transferred back to the photosensitive medium (145Y).
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