Patent ID: 8369024

Claim:
A lens driving device, comprising: a movable system comprising a lens frame to which a lens is fixed, and a non-rotatable threaded nut; a fixation system comprising a guide shaft inserted into a guide hole formed in the lens frame to allow the lens frame to advance and retract in an optical axis direction, and a restricting member for restricting rotation of the lens frame about the guide shaft; a lead screw rotatable with respect to the fixation system about an axis thereof substantially parallel to the guide shaft, the lead screw having a male thread threadedly engaged with the threaded nut of the movable system; a motor for rotating the lead screw about the axis thereof to allow the movable system to advance and retract along the lead screw; and a biasing member disposed between the threaded nut and the lens frame for biasing the lens frame in the axial direction and in a direction orthogonal to the axial direction.