| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration and loss by providing more current attenuation modes than a conventional image forming apparatus and by setting a suitable current attenuation mode according to a change in rotational speed, such as acceleration or deceleration, of a stepping motor.SOLUTION: An image forming apparatus comprises: a stepping motor; a drive signal generating part that generates a drive signal; a motor driver circuit that rotates the stepping motor at a speed corresponding to the frequency of a drive single, has a high speed attenuation mode, a low speed attenuation mode, and a mixing attenuation mode, and attenuates current in a mode on the basis of the magnitude of a mode set voltage; and a set voltage generating part that generates a mode set voltage, and generates a voltage to instruct current attenuation in the high speed attenuation mode when the rotation speed of the stepping motor is in a high-speed zone, a voltage to instruct current attenuation in the low speed attenuation mode when in a low speed zone, and a voltage to instruct current attenuation in the mixing attenuation mode when in a middle speed zone.SELECTED DRAWING: Figure 9 |
