ROTARY POLYHEDRAL MIRROR DRIVING DEVICE

摘要

PROBLEM TO BE SOLVED: To make it possible to deal widely with the size, shape and material of a positioning member for mounting the device required by a customer and to reduce the cost of the rotary polyhedral mirror driving device used for an LBP. SOLUTION: This rotary polyhedral mirror driving device has a rotor 11 which has a revolving shaft 1 and a rotor magnet 4 and is fixed with a rotary polyhedral mirror 10 and a stator 12 which is composed of a stator coil 9 for generating electromagnet torque by facing this rotor magnet 4 and a ferrous stator substrate 6 fixed with a bearing 7 for pivotally supporting the revolving shaft l. A dynamic pressure fluid bearing is adopted for the bearing 7 and the positioning member 5a for mounting the device is formed on the outside diameter part of the bearing 7 and is worked coaxially with the inside diameter of the bearing 7, by which the rotary polyhedral mirror driving device constituted to have the concentricity of the central axis of the rotary polyhedral mirror 10 and the positioning member 5a for mounting the device with high accuracy is embodied.