| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately drive and also easily adjusting the position of an optical element of a lens barrel which is retreated to a position different from a photographing optical axis and moves backward in a storage state. SOLUTION: As for the lens barrel, a rocking member is rotatably supported by a rotating center shaft arranged inside a straight advancing/retreating ring, a retreat optical element supported by the rocking member is made to retreat with rotation from a photographing position to a retreat position accompanying the retreating action of the straight advancing/retreating ring at the storage time. The lens barrel is provided with a pair of shaft supporting plates for supporting the front and rear end parts of the rotating center shaft of the rocking member while nipping the straight advancing/retreating ring before and behind, a supporting plate fixing means for allowing the shift of the pair of the shaft supporting plates in a direction orthogonal to the optical axis in a fixation release state, an eccentric shaft member which is rotatably supported by the straight advancing/retreating ring by taking an axis parallel to the optical axis of a photographing optical system as a center, and which has a pair of coaxial eccentric pins positioned on the common eccentric axis with reference to the rotation center on both ends, and mutually parallel oblong holes formed in mutually counter positions of the pair of shaft supporting plates so that one and the other of the pair of coaxial eccentric pins are fitted in the holes, and the pair of supporting plates is moved in a plane orthogonal to the optical axis with the rotation of the eccentric shaft member without changing the mutually relative positions of the supporting plates. COPYRIGHT: (C)2004,JPO&NCIPI
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