Lens driving apparatus

摘要

A lens driving apparatus includes a housing, a lens holder mounted on a base of the housing and moveable along an optical axis, a stationary guide member provided on the base, and a moveable guide member provided on and moveable with the lens holder, wherein the moveable guide member is frictionally engaged with the stationary guide member and slidable therealong when the lens holder is activated. The apparatus further include a plurality of magnets with magnetization direction lying on a plane perpendicular to the optical axis, a coil disposed adjacent and parallel to the magnets, and a position encoder provided on the lens holder or the support for close loop control of the movement of the lens holder.

主权项

1. A lens driving apparatus comprising:
(a) a base having at least one stationary guide member; (b) a moveable guide member provided on and moveable with a lens holder; (c) a coil attached to the lens holder; (d) a magnet holder holding a plurality of magnets with magnetization direction lying on a plane perpendicular to an optical axis defined by the lens holder; and (e) a position encoder attached to the lens holder; (f) wherein the said magnet holder is fixed on the said base, and the said moveable guide member on the said lens holder is engaged with the stationary guide member on the said base, and slidable therealong in a direction defined by the guide members; and (g) wherein the said position encoder is configured to send out a signal with respect to the change of the position of the lens holder.