Patent ID: 7916412

Claim:
A lens driving device, comprising: a stationary part comprising an iron shell, a movable part comprising a lens holder configured for holding lens therein, and a driving part configured for driving the movable part to move relative to the stationary part, the driving part comprising magnet means providing a plurality of magnetic poles fixed to one of the iron shell and the lens holder, and at least one coil fixed to the other one of the iron shell and the lens holder, the magnetic poles being divided into at least two layers stacked along optical axis direction of the lens and a plurality of groups arranged in the circumferential direction of the lens, the magnet means being polarized along the radial direction of the lens, the polarities of two stacked magnetic poles in the same group being opposite to each other so as to cooperatively form a magnetic circuit in a plane parallel to the optical axis direction, the coil having an axis around which the coil is wound, the coil axis being perpendicular to the optical axis direction, an upper part facing one layer of magnetic poles and a lower part facing the other layer of magnetic poles, the upper and lower parts of the coil being disposed at opposite sides of the axis of the coil.