Patent ID: 8411372
Filing Date: 2013-04-02
Classification: G02B

Abstract:
1. A lens barrel comprising: a lens holding member configured to hold a lens and to have a follower part; a rectilinear movement regulating barrel configured to regulate relative rotation of said lens holding member and to have a bayonet convex part at an outside; and a cam barrel configured to have a cam groove with which the follower part engages and a bayonet groove with which the bayonet convex part engages on an inner surface thereof, wherein said cam barrel moves in the optical axis direction while rotating relatively with respect to both of said lens holding member and said rectilinear movement regulating barrel, said lens holding member moves in the optical axis direction relatively with respect to said cam barrel by engagement of the follower part and the cam groove, and said rectilinear movement regulating barrel moves in the optical axis direction together with said cam barrel by engagement of the bayonet convex part and the bayonet groove, wherein the positional relationship between said cam barrel and said rectilinear movement regulating barrel in the optical axis direction is regulated because the bayonet convex part contacts the wall surfaces of both sides of the bayonet groove in a width direction in a first relative position of said rectilinear movement regulating barrel with respect to said cam barrel in the optical axis direction, and wherein the positional relationship between said cam barrel and said rectilinear movement regulating barrel in the optical axis direction is regulated because a section between a wall surface at the image surface side of the bayonet groove and the end face at the image surface side of said cam barrel is pinched between the bayonet convex part and a member provided in said rectilinear movement regulating barrel in the optical axis direction in a second relative position, which is different from the first relative position, of said rectilinear movement regulating barrel with respect to said cam barrel in the optical axis direction.