| 摘要 |
<p>An image forming apparatus (100) for forming an image on a recording medium includes belt unit (10; 10A). The belt unit (10; 10A) includes a belt (3; 110; 251; 304) configured to travel rotationally and looped around at least two rotary support members (1; 2; 5; 114; 115; 116; 252; 253; 302; 303), a driven rotary member (4; 150; 320; 321) disposed facing at least one of the rotary support members (1; 2; 5; 114; 115; 116; 252; 253; 302; 303) via the belt (3; 110; 251; 304) and configured to rotate with the belt (3; 110; 251; 304), and a controller (31; 31A). The controller (31; 31A) is configured to minimize fluctuation in one of a travel velocity and a travel distance of the belt (3; 110; 251; 304) by controlling the travel of the belt (3; 110; 251; 304) based on one of a rotational angular displacement and a rotational angular velocity of each of the rotary support member (1; 2; 5; 114; 115; 116; 252; 253; 302; 303) and the driven rotary member (4; 150; 320; 321).</p> |
