Patent ID: 8514327

Claim:
A voice coil motor comprising: a base; 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 defined a first receiving space, 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 moveable magnetic field generator defining a second receiving space in its center for being threadedly engaged with a lens module, the moveable magnetic field generator having internal threads formed on an internal wall of the second receiving space; and a case comprising a bottom plate and side plates, the bottom plate comprising a first surface and a second surface facing away the first surface, the side plates extending from the bottom plate, the bottom plate and the side plates cooperatively defining a receiving room, the receiving room receiving the stationary magnetic field generator, the moveable magnetic field generator, and the base, a center of the bottom plate defining a circular first through hole, a diameter of the first through hole being smaller than a diameter of the second receiving space; and a double sided adhesive layer received in the receiving room and entirely covering the second face of the bottom plate.