Patent ID: 8542452

Claim:
A voice coil motor (VCM), comprising: a case comprising an inner surface; the case comprising an upper plate and four sidewalls perpendicularly extending downward from four peripheral edges of the upper plate; the upper plate comprising a bottom surface and a plurality of first positioning poles extending downward from the bottom surface; a lens holder received in the case; the lens holder comprising an upper surface facing the bottom surface and a plurality of second positioning poles extending upward from the upper surface; a spring sheet connected between the first positioning poles and the second positioning poles; a coil; a magnet assembly, wherein one of the coil and the magnet assembly is positioned on and circles around the lens holder, the other of the coil and the magnet assembly is positioned on the inner surface of the case; and a guiding ring defining a guiding hole and being positioned on the inner surface of the case, one end of the lens holder being received in the guiding hole.