Lens barrel and cam mechanism

摘要

A lens barrel includes an optical system for forming an optical image of an object, a first tube for supporting at least one lens included in the optical system, and a second tube disposed inside or outside the first tube. The first tube includes first cam grooves in the side surface thereof on which the second tube is disposed. The second tube includes first cam followers that engage with the first cam grooves.

主权项

1. A lens barrel including a plurality of cam grooves and a plurality of cam followers, the lens barrel comprising:
an optical system for forming an optical image of an object; a first tube for supporting at least one lens included in the optical system; and a second tube disposed one of inside and outside the first tube, wherein the first tube includes a second cam groove and a third cam follower in a side surface thereof on which the second tube is disposed, the second tube includes a second cam follower engaging with the second cam groove and includes a third cam groove engaging with the third cam follower, and at least one of the second cam groove and the third cam groove includes a nonlinear section having a nonlinear shape, in the nonlinear section, at least one of the pairs among the pair of the second cam follower and the second cam groove, and the pair of the third cam follower and the third cam groove is engaged in a state in which, while the other one of such pairs is engaged at the same time.