| 摘要 |
PURPOSE:To make the surface area of an outside surface large and to enhance the dissipation of heat generated by a coil or the like at the inside of a laminate by a method wherein an uneven shape is formed on the outside surface of the laminate arranged at the outside of a rotor for an inner-rotor motor. CONSTITUTION:An inner driving motor 2 is constituted in such a way that a rotor 3 fitted with a driving magnet supports its rotor shaft 9 by a bearing 10 and that it is supported so as to be rotatable with reference to the side of a stator. In addition, a rotating polygon mirror 4 is attached to the upper part of the rotor 3 by a plate spring 11. Individual sheets whose outside diameter is different are sandwiched alternately or several sheets whose outside diameter is large are sandwiched between laminates 8 arranged at the outside of the rotor 3, and uneven parts are formed on the outside surface of the laminates 8 so as to increase a surface area. Thereby, when the motor is driven, heat generated by a coil or the like at the inside of the motor can be dissipated with good efficiency. |
