| 主权项 |
1. A vibration motor comprising:
a stator portion including a base, a case that includes a tube-shaped circumferential surface portion and a top surface portion which closes an upper end of the circumferential surface portion, and is fixed to the base in a lower end portion of the circumferential surface portion, a yoke plate that is mounted on the base and made of a magnetic material, a circuit board that is arranged on the base, a coil that is arranged on the circuit board, and a shaft that includes an upper end portion fixed to the top surface portion of the case; and a rotor portion including a rotor yoke that is supported to be rotatable about the shaft via a bearing, a magnet that is held by the rotor yoke, and a weight that is configured to rotate about the shaft, and has a centroid position which is different from a central axis of the shaft; wherein the case includes a protrusion portion that extends from a lower end of the circumferential surface portion; a lower end portion of the shaft is fixed to the stator portion; the base includes a concave portion that is recessed from a radially outer side of the base to a radially inner side of the base at a position overlapping with at least the protrusion portion at a circumferential edge of the base in a circumferential direction; and the protrusion portion is accommodated in the concave portion, and the entire protrusion portion or a portion of a tip end side in a direction in which the protrusion portion extends is bent radially inside the base so that a surface of the protrusion portion which is toward an upper side is in contact with the base. |
