| 摘要 |
PROBLEM TO BE SOLVED: To obtain a feeding storage structure that enables relative movement of an inside advancing/retracting ring relative to a cam ring in the direction of an optical axis, without being restricted by the coupling portion of the cam ring and an outside advancing/retracting ring, in a lens barrel in which the inside advancing/retracting ring whose movement is controlled in the direction of an optical axis by the guide of a cam groove is supported to the outside of the cam ring and the outer advancing/retracing ring is coupled to the outside of the inside advancing/retracting ring to allow only relative rotation with the cam ring.SOLUTION: The cam ring is provided with a larger diameter portion facing the outside of a cylindrical portion with a space between them in a radial direction, the cylindrical portion forming the cam groove. A means for coupling to the outside advancing/retracting ring is provided on the larger diameter portion. When the inside advancing/retracting ring is located furthest backward with respect to the cam ring in the direction of the optical axis, the rear end of the cylindrical portion of the inside advancing/retracting ring is caused to advance into the inside space of the larger diameter portion of the cam ring. |
