| 摘要 |
PROBLEM TO BE SOLVED: To obtain a toner image with proper image magnification, even if temp. in an image forming device body is changed. SOLUTION: When a temperature sensor 9 detects the fact that the temp. in a transfer belt 5a is raised for instance, the circumferential speed of the transfer belt 5a is slowdown so that a printer controller 10 executes control for reducing the scanning speed of a polygon mirror 3b or the processing speed of a photoreceptor drum 1 and the scanning speed of the polygon mirror 3b, or increasing the moving speed of the transfer belt 5a. Thus, the fluctuation of image magnification caused by the change in the temp. can be prevented. |
