Patent ID: 8319886

Claim:
A voice coil motor, comprising: a movable receiving cylinder having an inner receiving space for receiving a lens module, the receiving cylinder comprising a first end and an opposite second end, the first end adjacent to an object side of the lens module and the second end adjacent to an image side of the lens module; the receiving cylinder comprising a plurality of protrusions formed at the first end; a wire coil fixed to the receiving cylinder and surrounding the receiving cylinder; a hollow fixing frame receiving the receiving cylinder and the wire coil; a group of magnetic members fixed to an inner wall of the fixing frame and surrounding the wire coil, the magnetic members and the wire coil cooperatively configured for generating a magnetic driving force for driving the receiving cylinder to move in the fixing frame; a top elastic member comprising a peripheral portion and a central portion resiliently connected to the peripheral portion, the central portion having a central opening and a plurality of cutouts formed in an inner edge thereof in the central opening, the protrusions of the receiving cylinder engaged in the cutouts, the peripheral portion being fixed at a position lower than the central portion, thereby forming an elastic force applied to the receiving cylinder in a direction from the first end to the second end when no current is applied to the wire coil; and a bottom elastic member connected to the receiving cylinder and the fixing frame, the bottom elastic member being in an undeformed state when no current is applied to the wire coil.