Patent ID: 8520328
Filing Date: 2013-08-27
Classification: G02B,G03B

Abstract:
1. A lens barrel comprising a first lens group and a second lens group that are movable in an optical axis direction and a driving mechanism of the lens groups, the lens barrel comprising: a first cam member that is cam-engaged with a first holding member of the first lens group to thereby hold the first holding member; a second cam member that is cam-engaged with a second holding member of the second lens group to thereby hold the second holding member; a third cam member that guides the first and the second cam members; and a supporting member that is cam-engaged with the third cam member to thereby rotatably support the third cam member, wherein, the first lens group moves in accordance with the rotation of the third cam member, the second lens group moves in accordance with the rotation of the third cam member, wherein the lens barrel further comprises: a first rectilinear ring that is integrally movable with the first cam member in the optical axis direction and is relatively rotatable with respect to the first cam member about the optical axis; a second rectilinear ring that is integrally movable with the second cam member in the optical axis direction and is relatively rotatable with respect to the second cam member about the optical axis; the third cam member that guides the first and the second rectilinear rings; and a rectilinear guide member that is integrally movable with the third cam member in the optical axis direction and restricts the rotation of the first and the second rectilinear rings; a first cam follower that is formed on the first rectilinear ring; a second cam follower that is formed on the second rectilinear ring; and a first projection that is formed on the first cam member; and a second projection that is formed on the second cam member, wherein the third cam member comprises a first cam groove that engages with the first cam follower, a second cam groove that engages with the second cam follower, and a first guide groove that engages with the first projection, and a second guide groove that engages with the second projection.