| 摘要 |
PURPOSE:To prevent a polygonal mirror or the like from damage due to impact force at the carrying time of a device and to improve the reliability of the device by forming cushioning members having double structure on both the sides of a rotary assembly body. CONSTITUTION:The cushioning member 70 consists of a wear resisting member 71 arranged on the rotary assembly body 50 side and an elastic member 72 arranged on the outside of the member 71, i.e. on the motor casing side and the elastic member 72 side is fixed on the inside of the motor casing 30 by a bonding agent. The upper cushioning member is fixed on a fixed shaft 40 at its center part and the peripheral part of the lower cushioning member is pressed by a motor driving circuit substrate 63. When the rotary assembly body is moved in its axial direction due to vibration or the like, the movement is cushioned by the cushioning member 70 to protect the rotary assembly body. Since the cushioning member is constituted of the double structure arranging the high wear resisting material on its inside, the device is prevented from the generation of shavings due to contact with the rotary assembly body and mixing of them into the bearing part. |
