| 摘要 |
PROBLEM TO BE SOLVED: To achieve power-saving and improvement and the like of position precision in an optical axis direction of a movable part. SOLUTION: A lens unit is provided with a lens barrel 11 for arranging an imaging optical system, the movable part 49 having a movable lens and moved to the optical axis direction, a linear actuator 65 for moving the movable part in the optical axis direction, and a pair of urging plate springs 35 and 40 having holding parts 36, 42 and 42 for holding the movable part, a plurality of spring parts 37, 37, ..., 43, 43, ... capable of elastic deformation and for urging the movable part in the direction of the optical axis, and attached parts 38, 38, ..., 44, 44, ... attached to the lens barrel. The pair of the urging plate springs urge the movable part to a mutually nearing direction in the optical axis direction; spring forces of the spring parts of one urging plate spring and the other urging plate spring are made to differ from each other. The movable part is held on one moving end in the optical axis direction, by urging force of the urging plate spring in non-driving of the linear actuator. The movable part is moved to the other moving end by drive force of the linear actuator. COPYRIGHT: (C)2006,JPO&NCIPI
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