Lens barrel

Abstract

A lens barrel includes a first lens, a second lens, a first frame body, a second frame body, and a retracting lens frame. The retracting lens frame is configured to move so that a position of the second optical axis of the second lens changes from a position on the first optical axis of the first lens to a position that is outside the first optical axis, during the transition period between the imaging enabled state and the housed state. A contact portion is formed on the inner peripheral part of the first frame body. A protrusion of the retracting lens frame is configured to engage with and guided by the contact portion during movement of the retracting lens frame. The thickness of a region constituting the side wall of the contact portion is increased over the thickness of the other region toward the inside of the cylindrical part.

What is claimed is: 
     
         1 . A lens barrel, comprising:
 a first lens including a first optical axis;   a second lens including a second optical axis;   a first frame body;   a second frame body configured to move in the first optical axis direction with respect to the first frame body; and   a refracting lens frame configured to support the second lens, be supported by the second frame body, and configured to move so that a position of the second optical axis changes from a position on the first optical axis to a position that is outside the first optical axis during the transition period between the imaging enabled state and the housed state,   the first frame body includes a cylindrical part, and a contact portion is formed on the inner peripheral part of the cylindrical part, the contact portion including at least one side wall, the at least one side wall configured to stand toward an inside of the cylindrical part,   the refracting lens frame includes a protrusion, the protrusion configured to engage with the contact portion and be guided by the contact portion when the refracting lens frame moves around a refraction shaft, and   the thickness of a region constituting the side wall of the contact portion is increased over the thickness of the other region toward the inside of the cylindrical part.   
     
     
         2 . The lens barrel according to  claim 1 , wherein
 the region constituting the side wall of the contact portion includes the area near the portion where the contact portion is formed.   
     
     
         3 . The lens barrel according to  claim 1 , wherein
 the contact portion is formed in a groove shape, the groove shape including two opposing side walls.   
     
     
         4 . The lens barrel according to  claim 2 , wherein
 the contact portion is formed in a groove shape, the groove shape including two opposing side walls.