Patent ID: 6807016
Filing Date: 2004-10-19
Classification: C08J,G02B,Y02W

Abstract:
A lens barrel comprising:a front sub-lens group provided on the object side and a rear sub-lens group provided on the image side, said front and rear sub-lens groups functioning optically when in a mutually close position and in a mutually distant position with respect to the optical axes of said front and rear sub-lens groups; a front sub-lens group frame for supporting said front sub-lens group and a rear sub-lens group frame for supporting said rear sub-lens group; a lens frame shift mechanism for causing said front sub-lens group frame and said rear sub-lens group frame to move relative to each other to obtain said mutually close position and said mutually distant position; a first lens group positioning surface, provided on said front sub-lens group frame, for positioning said front sub-lens group in the optical axis direction by contacting a portion of a rear surface of said front sub-lens group upon said front sub-lens group being inserted from the front side of said front sub-lens group frame; a front frame engaging portion provided on a rear side of said front sub-lens group frame, a second lens group positioning surface, provided on said rear sub-lens group frame, for positioning said rear sub-lens group in the optical axis direction by contacting a portion of a front surface of said rear sub-lens group upon said rear sub-lens group being inserted from the rear side of said rear sub-lens group frame; and a rear frame engaging portion provided on a front side of said rear sub-lens group frame, wherein said front frame engaging portion is held in engagement with said rear frame engaging portion in the direction of the optical axis while said front and rear sub-lens group frames are able to move in the optical axis direction relative to each other.