Patent ID: 8432477

Claim:
A lens barrel structure comprising: a lens frame including a lens frame body configured to support a lens element of an optical system, at least three through-holes formed in the lens frame body in the direction of the optical axis of the optical system, and at least three cam members and at least one protruding member formed on and protruding from the lens frame body; and a cam frame including a cam frame body, at least three projection members extending from an end of the cam frame body in the direction of the optical axis and insertably disposed through the through-holes of the lens frame, at least three cam grooves formed in the cam frame body and the projection members, the cam grooves being configured to guide the cam members and movably support the lens frame with respect to the cam frame body, and at least one auxiliary groove formed along the circumferential direction of the cam frame body, the auxiliary groove being configured to guide the protruding member, the end of the auxiliary groove formed near the end of the cam frame body with the projection members is disposed between two adjacent projection members.