Lens barrel of camera

摘要

A first cam groove for driving a lens holding frame along the optical axis is formed in the internal circumferential surface of a rotatable cylinder supporting the lens holding frame therein. A first cam follower provided at the lens holding frame engages with the first cam groove. A second cam groove is formed in the internal circumferential surface of the rotatable cylinder along the first cam groove. A guide member is inserted in the rotatable cylinder movably along the optical axis and is provided with a second cam follower engaging with the second cam groove. A tension spring is stretched between the lens holding frame and the guide member. This causes the lens holding frame to be always pressed forward.