Patent ID: 7339756

Claim:
A lens driving device comprising: a lens frame to which one or more lenses are attached; a first guide shaft arranged parallel to an optical axis of the one or more lenses, inserted into a first hole of the lens frame and configured to guide the lens frame to move along the optical axis; a second guide shaft arranged parallel to the optical axis, inserted into a second hole of the lens frame which is opposed to the first hole across the optical axis and configured to guide the lens frame in cooperation with the first guide shaft to move along the optical axis; a rack member on which rack teeth are formed along the optical axis and supported by the lens frame in the vicinity of the first hole so that the rack member can swing in a direction perpendicular to the optical axis; a lead screw configured to mesh with the rack teeth, which each leans at an angle substantially coinciding with a lead angle of the lead screw, to move the lens frame forward or backward along the optical axis at a time of rotating in a clockwise direction or an anticlockwise direction by using a drive power of a motor; and a spring member configured to press the rack teeth toward the lead screw to generate reaction force acting from the lead screw toward the rack teeth, wherein the rack teeth are formed on the rack member such that a direction in which the reaction force acts crosses a face connecting the first and second guide shafts.