| 摘要 |
An image forming apparatus, including: a rotatable photosensitive member; a light source configured to emit a light beam; a rotary polygon mirror configured to deflect the light beam to scan a surface of the photosensitive member; a motor configured to rotate the rotary polygon mirror; a first rotation amount detecting unit configured to detect a rotation amount of the rotary polygon mirror; and a second rotation amount detecting unit configured to detect a rotation amount of the photosensitive member, wherein a first period of a first signal from the first rotation amount detecting unit and a second period of a second signal from the second rotation amount detecting unit have a relationship of an integral multiple, and wherein a rotation speed of the motor is controlled so that the first signal and the second signal are synchronized with each other while maintaining the relationship of the integral multiple. |
