| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately measure a linear speed of an intermediate transfer belt or the like to allow color misregistration to be corrected with a high degree of accuracy. <P>SOLUTION: An image forming apparatus is provided which comprises an intermediate transfer belt 15, and a plurality of image-forming units 11 to 14 disposed along the intermediate transfer belt 15 and adapted to form toner images of different colors and sequentially transfer the toner images onto the intermediate transfer belt 15 in a superimposed manner so as to form a color toner image. The intermediate transfer belt 15 is laid across a drive roller 16, a driven roller 17 and a tension roller 18, in a tensioned condition. A rotation speed of the tension roller 18 adapted to apply a tension to the intermediate transfer belt 15 is detected to obtain a linear speed of the intermediate transfer belt 15. In a process of color-misregistration correction, a write-start timing for each toner image of the colors is adjusted based on the linear speed of the intermediate transfer belt 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
