Patent ID: 8754553

Claim:
A voice coil motor comprising: a base comprising a first surface, the base defining a through hole in a center of the first surface, and a plurality of cavities surrounding the through hole; a stationary magnetic field generator mounted on the base, and comprising a supporting frame and a plurality of permanent magnetic elements mounted on the supporting frame, the supporting frame defining a first receiving space therein, the magnetic elements being positioned around the first receiving space; a moveable magnetic field generator moveably received in the first receiving space, the moveable magnetic field generator comprising a core member and a coil wrapped around the core member, the core member comprising a lower surface facing toward the first surface of the base, and a plurality of flanges extending downwards from the lower surface and spatially corresponding to and received in the cavities, respectively, each of the flanges comprising an end surface that is away from the lower surface, the end surface defining two sloped surfaces extending slantingly upward from a middle portion of the end surface to two opposite ends of the end surface, respectively; and a case receiving the stationary magnetic field generator, the moveable magnetic field generator, and the base therein.