Patent ID: 8605372
Filing Date: 2013-12-10
Classification: G02B

Abstract:
1. A voice coil motor (VCM), comprising: a case comprising an upper plate and a sidewall extending downward from peripheral edges of the upper plate, the upper plate and the sidewall cooperatively defining a receiving room; a moving barrel received in the receiving room; a magnet assembly comprising a plurality of magnetic elements, the magnetic elements received in the receiving room and surrounding the moving barrel; each of the magnetic elements comprising a first magnet and a second magnet staked on the first magnet; the first magnet comprising a first magnet surface facing an optical axis of the VCM, and the second magnet comprising a second magnet surface facing the optical axis; the first magnet surface having a magnetic pole different from a magnetic pole of the second magnet surface; a lower plate positioned on one end of the sidewall facing away from the upper plate; a first elastic plate connected between the upper plate and the moving barrel or between the lower plate and the moving barrel; a first coil assembly comprising a plurality of pairs of coils, the coils configured for driving the moving barrel to incline to a plane perpendicular to the optical axis, each pair of the coils opposite to each other and attached on the moving barrel; and a second coil assembly, the second coil assembly being annular shaped and sleeved over the moving barrel, for driving the moving barrel to move along the optical axis; wherein the first coil assembly is configured for stabilization and the second coil assembly is configured for focusing.