Patent ID: 9223110
Filing Date: 2015-12-29
Classification: G02B

Abstract:
1. A lens barrel comprising: a cam cylinder on an inner circumferential surface of which a plurality of cam grooves is formed; a fixed frame arranged around the cam cylinder; a plurality of lens groups that has one or more lenses per lens group; and at least three lens-holding frames, each of which frames integrally holds at least one lens of the one or more lenses of a corresponding lens group, has a cam follower that engages with at least one of the cam grooves on the cam cylinder, and is moved forward and backward along an optical axis direction along a track of each of the cam grooves with rotation of the cam cylinder relative to the fixed frame, each of the at least three lens-holding frames having: wherein an inner circumferential part of the cylindrical part of each of the at least three lens-holding frames corresponding to each of the lens group and the cylindrical part of each of the three lens-holding frames corresponding to the lens group positioned on an image plane side of each of the lens group are arranged to always overlap in the optical axis direction in a range of positions between and including a wide-angle position and a telephoto position of the lens barrel, and wherein the cylindrical part of each of the at least three lens-holding frames corresponding to the lens group arranged on the most image plane side is provided with a reinforcing rib on an inner circumferential side corresponding to a position of the cam follower on the outer circumferential surface of a continuous cylindrical portion of the cylindrical part.