Design of a voice coil motor used in the focusing system of a digital video camera

Recently, digital video cameras (DVC) have been more popular. In order to attract more customers, the conventional focusing actuator, stepper, in DVC is gradually replaced with the voice coil motor (VCM) because this can reduce the focusing time in DVC. However, the battery consumption and the efficiency of a VCM for DVC are also important since DVC are portable apparatuses. This paper raises a valid method to design a VCM in DVC. The performances of DVC will reach to lower battery consumption, higher efficiency, and shorter focusing time by turning the diameter of a winding coil, the thickness of the magnet and the windings spaces in a VCM.