Motor start examining device and method.

摘要

The present invention is suitable for examination of the rotating state of a Polygonal motor in an image forming apparatus. It is judged whether or not the rotational speed of the motor is a target speed until a first time has elapsed since the supply of power to the motor for rotating a Polygonal mirror was started every other second time sufficiently shorter than the first time continuously for a third time sufficiently shorter than the second time. If it is judged that the rotational speed of the motor is the target speed continuously for the third time, it is judged again whether or not the rotational speed of the motor is the target speed after an elapse of a fourth time since the judgment. If the rotational speed of the motor is the target speed, the motor outputs a signal indicating that the motor is stabilized at the target speed. If the rotational speed of the motor is not the target speed, the motor further waits until a fifth time has elapsed for judging whether or not the rotational speed of the motor is the target speed. If the rotational speed of the motor is the target speed, the motor outputs a signal indicating that the motor is stabilized at the target speed. Image formation processing is performed in response to the signal indicating that the motor is stabilized at the target speed.