| 摘要 |
PROBLEM TO BE SOLVED: To provide a guide structure which can bias lenses in an optical axis direction by using one biasing means and can suppress the blurring between the lenses by imparting a turning force around a guide shaft to the lenses, and to provide a viewfinder structure. SOLUTION: The guide structure has: the guide shaft which is parallel to the optical axis of a movable lens group; a movable lens group supporting frame which is slidably supported on the guide shaft; a movement biasing means which biases the movable lens group supporting frame to one side of the optical axis direction; and a turning movement biasing means which biases the turning movement of the movable lens group supporting frame around the guide shaft. A torsion coil spring having a coil section and a pair of legs extending from both ends of the coil section is used as a spring means used in common as the movement biasing means and the turning movement biasing means. The coil section of the torsion coil spring is supported around an axis orthogonal with the optical axis and the guide shaft without intersecting with these axes, and the force acting between the pair of the legs of the torsion coil spring is utilized as the movement biasing means. The force with which the legs of the torsion coil spring tends to return to a straight line is utilized as the turning movement biasing means. COPYRIGHT: (C)2004,JPO&NCIPI
|
