Patent ID: 7991278
Filing Date: 2011-08-02
Classification: G03B,H04N

Abstract:
1. A camera module comprising: a voice coil motor comprising a fixing assembly, a movable assembly, an elastic member connecting the movable assembly to the fixing assembly, and a pivoting member mounted between the fixing assembly and the movable assembly, the fixing assembly comprising a frame and a plurality of first magnetic members mounted on the respective inner sides thereof, the movable assembly comprising a housing received in the frame and a plurality of second magnetic members mounted on the respective outer sides thereof, the first magnetic members and the second magnetic members being configured for driving the housing to move along a central axis thereof, the elastic member comprising a first portion fixed to the housing, a second portion and a third portion both fixed to the frame, a first connecting portion and a second connecting portion connecting the first portion to the second portion and connecting the first portion to the third portion, respectively, and a gap maintained between any adjacent two of the first, second and third portions; a lens assembly and an image sensor received in the housing; a plurality of Hall sensors located within the frame and substantially aligning with the respective second magnetic members, the Hall sensors being capable of detecting movement distances of the second magnetic members relative to the respective Hall sensors according to changes of intensity of magnetic fields generated by the respective second magnetic members; and a control module comprising a current distributor electrically connected to the first magnetic members, and a processor electrically connected to the Hall sensors, the current distributor configured to provide a current to one of the first magnetic members to drive the housing to move along the central axis and rotate an angle relative to the pivoting member, the processor configured for calculating the rotation angle of the housing based on movement distances of the second magnetic members relative to the respective Hall sensors.