Patent ID: 8575793

Claim:
A voice coil motor, comprising: a fixing unit comprising a frame defining a receiving space, and a plurality of magnetic blocks mounted in the receiving space, the frame having a plurality of first grooves formed therein; a movable unit comprising a barrel and a coil of wire surrounding the barrel, the movable unit being movably received in the receiving space of the frame and surrounded by the magnetic blocks; a base mounted to a bottom of the frame; an elastic plate having an elastic portion connected to the movable unit, and a gasket fixed to the base; a cover plate mounted to a top of the frame, the cover plate having a plurality of second grooves formed therein adjacent to the respective first grooves, the first grooves and the second grooves cooperatively constituting a plurality of recesses; and a plurality of rollers rotatably received in the respective recesses and coming into contact with the barrel, the rollers being unmovable along a moving direction of the movable unit, the rollers configured for holding the movable unit in position when no magnetic force is applied on the movable unit.