| 摘要 |
PURPOSE:To prevent the dirt of a mirror surface part due to dust or the like entangled into a device. CONSTITUTION:A driving motor 12 is fixed onto an optical box main body 11 by a fixing method like screwing, and the driving motor 12 is rotatably provided with a rotor 13 to which a driving magnet is attached. A rotating polyhedral mirror 14 is attached above the rotor 13 by a method like a flat spring. The outer periphery of the upper face of the rotor 13 is lifted to form a projecting part 13a, and the seat surface of the rotating polyhedral mirror 14 is made lower than the upper face of the rotor 13, and the lower part of the rotating polyhedral mirror is sunk in the rotor 13, thereby reducing a vortex generated on the mirror surface. |
