Patent ID: 8279534
Filing Date: 2012-10-02
Classification: G02B,Y10T

Abstract:
1. A lens driving device, comprising: a motor mounted to a plate; a lead screw connected to the motor for undergoing rotation about an axial line thereof; a nut threadingly engaged with the lead screw, the nut having a convex protruding portion protruding outwardly from an outer peripheral surface of the nut; a casing mounted to the plate for housing the lead screw and the nut, the casing having a fitting groove linearly formed in the casing in a direction of the axial line for receiving the protruding portion in a state in which the protruding portion is fitted in the fitting groove so as to regulate rotation of the nut, and for movably guiding the protruding portion in the fitted state in the direction of the axial line to move the nut back and forth along the lead screw, at least one of the casing and the protruding portion of the nut having a tapered surface formed so as to forcibly guide the protruding portion toward the fitting groove to gradually fit the protruding portion into the fitting groove when the casing and the plate are mounted together; and a lens frame having a lens holding portion for holding a lens and having an abutting portion abutting the nut, the lens frame being supported on the casing so as to move in the direction of the axial line and to move in accordance with back and forth movement of the nut to move the lens back and forth in the direction of the axial line.