| 摘要 |
PURPOSE: A radial gap rotary yoke type brushless vibration motor are provided to remove an output shaft and an eccentric weight attached thereto so that cost can be reduced. CONSTITUTION: A raised portion is formed by bending one end of a support body formed of a tin plate. A stator holder formed of synthetic resin is outsert-formed at or is pressed onto the other end of the support body. Since the bottom of the support body and the stator holder form a flat surface, the support body can be placed on a printed circuit board. Reference numeral denotes a shaft which is formed in the raised portion after an eccentric rotor or a stator coil is installed at the shaft. One end of the shaft is fixedly inserted in an insertion hole formed in the stator holder and the other end of which is fixedly inserted in a U-shaped portion. The shaft is fixedly installed at the U-shaped portion by using wedges. A thin and elongated, pipe-shaped rotary yoke is rotatably installed at the shaft via a pair of bearings. A neck portion which is a thinner part of a cylindrical rotor case is fixedly installed at the outer side of one end of the rotary yoke. It is a characteristic feature of the present invention that a cut-out portion is formed in an axial direction of the motor making an open angle of 150 deg. with respect to the shaft at the cylindrical rotor case, thus constituting an eccentric rotor R. Reference numeral denotes a cylindrical field magnet, the outer circumference of which is fixed to the eccentric rotor case, and constitutes a magnetic circuit together with the rotary yoke.
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