Patent ID: 9563034
Date: 2017-02-07
CPC Classifications: G02B,G03B

Claim:
1. A lens barrel comprising: a first barrel member including a first cam groove and a first cam follower; and a second barrel member including a second cam follower to engage with the first cam groove, and a second cam groove to engage with the first cam follower, the second barrel member performing relative rotation and relative movement in an axis direction of the rotation with respect to the first barrel member, wherein the first cam groove and the second cam groove are related to each other such that, when the first cam groove and the second cam groove are developed on a plane and the first cam groove and the second cam groove are viewed in the same direction, the first cam groove and the second cam groove are formed to have cam paths having a same shape obtained by being rotated to each other by 180 degrees about any one point on the developed plane.