| 摘要 |
Disclosed is an image forming apparatus, 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 ).
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