| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel in which multiple lens groups are caused to be movable so as to perform linear advancement restriction of a plurality of optical members effectively.SOLUTION: A lens barrel 23 includes a fixed cam ring 9, a drive ring 10 disposed on an outer circumferential surface thereof, and a moving cam ring 3 which is moved, by the rotation of the drive ring 10, in an optical axis direction by following a cam groove formed on an inner circumferential surface of the fixed cam ring 9. A linear advancement restricting member 4 is rotatable by connecting a moving cam ring 3 with a bayonet, and movable substantially integrally in the optical axis direction. A first lens group 1 is moved in the optical axis direction by the moving cam ring 3, and a second lens group 7 for focus adjustment is disposed. A follower part 7d follows a cam groove 10a formed on an inner circumferential surface of the drive ring to thereby cause a holding member of the second lens group 7 to move in the optical axis direction while being so held as to advance straight by a straight advance guide part provided at the fixed cam ring 9. The holding member of the second lens group 7 includes a plurality of straight advance guide parts 7e and holds the linear advancement restricting member 4 so as to advance straight. |
