| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of forming excellent images at a point of image density by allowing the density of formed toner images to be in a preset allowable range. <P>SOLUTION: The image forming apparatus P sequentially arranges a plurality of image forming parts Y, M, C, K including an image carrier 1, a charger 2, an image exposure device 3, and a developing unit 4 along a recording medium conveying belt 7 and provided with a transfer unit 5 for transferring toner images on the image carrier in each image forming part to a recording medium S. Transfer bias is applied on two or more transfer units 5 from a common transfer power source P3. Each of the image forming parts corresponding to the transfer unit 5 applying the transfer bias from the common transfer power source P3 controls exposure setting by the image exposure device 3 or development bias setting of the developing unit so that the density of the toner images formed therein is in the allowable range on the surface part of the image carrier 1 in which transfer charge flows in from the transfer unit 5 without interposing the recording medium S. <P>COPYRIGHT: (C)2009,JPO&INPIT |
