| 摘要 |
PROBLEM TO BE SOLVED: To provide lens barrels that enable a smooth movement of a lens holding member toward an optical axis.SOLUTION: A lens barrel is adapted to comprise: a lens holding member 11 that is relatively movable toward an optical axis O direction within a lens barrel; guidance means 21 and 22 for guiding the lens holding member toward the optical axis direction; a cum member 14 that has cum grooves 14a and 14b in an inner peripheral surface, rotates around the optical axis and drives the lens holding member toward the optical axis direction by the cum grooves; a cum follower 31 that has a follower part 31a engaging with the cum grooves and a rotary axis part 31c eccentrically arranged toward the optical axis direction with respect to a central axis P1 of the follower part arranged in parallel with respect to a central axis of the follower part; a cylindrical member 12 that has a rectilinear groove 12a fitting into the cum follower to guide the cum follower toward the optical axis direction; and an elastic member 33 that depresses the cum follower into the cum grooves. |
