Patent ID: 7876514
Filing Date: 2011-01-25
Classification: G02B

Abstract:
1. A lens barrel comprising: a first frame member which is an elastically deformable cylindrical frame member having a first groove group, in which a plurality of grooves formed in the circumferential direction are arranged in the optical axis direction, at the outer periphery thereof; and a second frame member which is an elastically deformable cylindrical frame member engaging with the outer periphery of the first frame member and having a second groove group, in which a plurality of grooves formed in the circumferential direction are arranged in the optical axis direction so as to face to the first groove group, at the outer periphery thereof, the second frame member being movable relative to the first frame member without interference of the second groove group with the first groove group during the ordinary operation, wherein at least either one or both of the first frame member and the second frame member is deformed by an external force applied to the lens barrel so that the first groove group and the second groove group interfere with each other, whereby the relative shift in the optical axis direction of the first frame member and the second frame member is prevented.