Compact Stepping Lens Actuator for Mobile Cameras

摘要

An actuator ( 100 ) including: a housing ( 102 ); a driven member ( 104 ) movably disposed with respect to the housing; a magnet ( 114 ) associated with the driven member and a ferric member ( 112 ) for providing a magnetic attraction force between the driven member and the ferric member for providing a normal force (Fn) between the housing and driven member such that a friction force between the housing and driven member resulting from the normal force must be overcome to initiate a relative movement between the housing and driven member; and a magnetic drive system ( 118, 120 ) for overcoming the friction force and driving the driven member relative to the housing. The driven member can be a lens holder for holding a lens ( 106 ), in which case, the actuator can further include an image sensor ( 110 ) for acquiring image data through the lens.