Patent ID: 7851952
Filing Date: 2010-12-14
Classification: H02K

Abstract:
1. A voice coil motor, comprising: a hollow stationary magnetic field generator having a first end and an opposite second end, the first and second ends each having a plurality of protrusions formed thereon; a movable magnetic field generator movably received in the stationary magnetic field generator, the movable magnetic field generator comprising a core member having a first end and an opposite second end, and one or more coils of wire wrapped around the core member between the first end and the second end, the first end having a plurality of guiding posts extending therefrom parallel to a central axis of the core member, and a plurality of stopping bars extending therefrom; a first and a second elastic members each comprising a plurality of first engaging holes defined therein, the first elastic member further comprising a plurality of second engaging holes and a plurality of first guiding holes defined therein, the first and second elastic members being disposed adjacent the first and second ends of the stationary magnetic field generator, respectively, the movable magnetic field generator disposed between the first and second elastic members with each of the guiding posts extending through a respective first guiding hole, and each of the stopping bars extending through a respective first engaging hole, each of the protrusions extending through a respective second engaging hole; a hollow case receiving the stationary magnetic field generator, the movable magnetic field generator, and the first and second elastic members therein, the case comprising a top sheet and a plurality of side sheets, the top sheet having a plurality of second guiding holes defined therein, wherein when the movable magnetic field generator is moved, the guiding posts are slidable in the second guiding holes, and the stopping bars of the first end of the movable magnetic field generator are capable of limiting the movement of the movable magnetic field generator toward the top sheet by abutting the top sheet; and a base mounted to the bottom of the case, the protrusions of the second end of the stationary magnetic field generator being attached to the base.