| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of suppressing noise to the minimum and always realizing sufficient cleaning performance. <P>SOLUTION: The image forming apparatus includes a stage in which a toner image is formed on a 1st image carrier by a developing device and is primarily transferred to a 2nd image carrier, and a stage in which the former stage is repeated further for a plurality of colors so as to secondarily transfer the superposed toner images to transfer material, and then it has a charging member abutting on the 2nd image carrier, a charging means comprising a power source for applying alternating voltage to the charging member on a more downstream side than the secondary transfer position of the 2nd image carrier and on a more upstream side than the primary transfer position thereof, and includes a stage in which toner coming from the secondary transfer position to the position of the charging member through the 2nd image carrier is charged to have a predetermined polarity by the charging means. In the apparatus, the amount of the charged toner is estimated or detected and the frequency of the alternating voltage is set to be higher as the amount of the toner becomes larger. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
