JP2009134160A5 - - Google Patents

Claims (3)

A frame member having a cam follower on its peripheral surface and rotating around the optical axis;
In order to rotate the frame member, a rectilinear groove provided on the circumferential surface parallel to the optical axis with which the cam follower is fitted and slidably contacted, and a protrusion projecting radially on the same circumferential surface in the vicinity of the rectilinear groove are provided. Rotating frame,
Since it rotates relative to the rotating frame and moves in the optical axis direction together with the rotating frame, it engages with the circumferential groove with which the protrusion engages and the cam follower within a predetermined angular range of the peripheral surface. A moving frame provided with a cam groove provided in the predetermined angle range for displacing the frame member in the optical axis direction;
A lens barrel characterized by comprising:   The portion of the cam follower that comes into sliding contact with the cam groove of the moving frame has a tapered shape, and the reaction force generated at the fitting sliding contact portion is the circumferential groove or radial direction of the moving frame. The lens barrel according to claim 1, wherein the engaging wall projecting on the lens is deformed in a radial direction so as to deepen engagement with the protrusion of the rotating frame.   The circumferential groove with which the protrusion engages or the engagement wall projecting in the radial direction exists at least on a straight line parallel to the optical axis through the cam follower on the peripheral surface of the moving frame. The lens barrel according to claim 1 or 2, wherein