Patent ID: 7857526

Claim:
An electromagnetic actuator comprising: a bobbin made of a non-magnetic material which includes a hollow cylindrical portion and two disk flanges fixed to opposite ends of said hollow cylindrical portion, respectively; a coil formed between said two disk flanges by winding insulated wire around said hollow cylindrical portion; a power supply which supplies a current to said coil; a movable member pivoted on said hollow cylindrical portion; and at least one stationary member made of a permanent magnet and fixed to at least one of said two disk flanges, wherein said movable member is made of a magnetic material and comprises a shaft portion and at least one rotating portion, wherein said shaft portion is pivoted about said hollow cylindrical portion, wherein said rotating portion is fixed to said shaft portion, lies on said disk flange, and extends in a radial direction of said shaft portion, wherein, when said power supply supplies said current to said coil in a predetermined direction, said rotating portion is magnetized to a predetermined polarity and rotates on said disk flange by a magnetic force of said permanent magnet, and wherein said stationary member includes a stopper for stopping rotation of said movable member at a predetermined rotational position.