Patent ID: 7271516

Claim:
A stepping motor for generating vibration, comprising: a stator, comprising: an annular stator coil; and a pair of stator yokes each comprising pole teeth, and the annular stator coil is held between the pair of stator yokes so that the pole teeth of the one of the stator yokes meshes with the pole teeth of the other of the stator yokes in a comb-like arrangement; and a rotor, comprising: a shaft; a magnet; and a rotor frame, comprising: a substantial cup-shape comprising a disk portion having an opening at a center thereof, and a cylindrical portion continuously arranged at a periphery of the disk portion; and a weight portion arranged in a part of the rotor frame so that a gravity center of the rotor frame is located at a position eccentric with respect to a center of the rotor frames, wherein the stator is disposed in the rotor frame, and wherein the pole teeth arranged in the comb-like arrangement include a plurality of pairs of pole teeth, with one of the pairs of the plurality of pairs of pole teeth having widths different from each other so that the rotor can always rotate in one direction at the time of starting and at least one of the other pairs of the plurality of pairs of pole teeth having a same width.