摘要 |
PROBLEM TO BE SOLVED: To allow a cam cylinder to be shared among a plurality of lens barrels different by product specifications without exerting an influence upon operability. SOLUTION: With respect to the lens barrel, the cam cylinder where cam grooves inclined to a direction of an optical axis are formed and a rectilinear cylinder where a rectilinear groove in the direction of the optical axis is formed are disposed on concentric circles, and a cam pin provided on a lens holding frame is engaged with the cam groove and the rectilinear groove, and the lens holding frame is moved in the direction of the optical axis while following the cam groove. At least two first and second cam grooves different by inclinations are formed on the cam cylinder, and the cam pin is engaged with the first cam groove when the cam cylinder is used in a first lens barrel, and the cam pin is engaged with the second cam groove when the cam cylinder is used in a second lens barrel other than the first lens barrel. COPYRIGHT: (C)2007,JPO&INPIT
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