| 摘要 |
PROBLEM TO BE SOLVED: To maintain positions of an eccentric weight and a back yoke with respect to a shaft, at designed positions without increase of production man hour.SOLUTION: A vibration motor comprises: a shaft 75 fixed to a base 10 and a case 40; a rotor magnet 90 for surrounding the shaft 75; an armature 70; a back yoke 80 contacting an upper surface of the rotor magnet 90 and extending in a radial direction; an eccentric weight 100; and a holder 120 for holding the back yoke 80 and the eccentric weight 100. The holder 120 comprises: a penetration part 121 disposed inward of the rotor magnet 90 in the radial direction and surrounding the shaft 75; an upper surface part 123 extending outward of the penetration part 121 in the radial direction, and covering at least part of the upper surface of the eccentric weight 100; and a lower surface part 127 extending outward of the penetration part 121 in the radial direction and extending inward of an inner edge of an opening of the rotor magnet 90 in the radial direction, and covering at least part of a lower surface of an overhang part 81 of the back yoke 80. In addition, the shaft 75 supports the holder 120 rotatably. |
