CAMERA LENS BARREL PROVIDED WITH TEMPERATURE CORRECTION MECHANISM OF FOCUSING POSITION

摘要

PROBLEM TO BE SOLVED: To provide a lens barrel provided with temperature correction mechanion of focusing position by which focusing can be facilitated in the case of infinity photographing, and by which accurate focusing following up the movement of the focusing position corresponding to temperature fluctuation can be performed. ;SOLUTION: A stopper piece 71 regulating an infinity side focusing position is supported on a focusing ring 3 for focusing provided on the lens barrel so as to more in a barrel shaft direction, and a stopper ring 5 abutting on the piece 71 and regulating the rotation operating position of the ring 3 is provided on the lens barrel. Abutting surfaces 77 and 53 of the piece 71 and the ring 5 are tapered sides inclined in the barrel shaft direction. The piece 71 is moved by dimension corresponding to the fluctuation of ambient temperature by the cam 41 of a temperature correction ring 4, so that the abutting positions of the piece 71 and the ring 51 are changed in the rotation operating direction of the ring 3, and the stopping position of the ring 3 can automatically be set correspond to the fluctuation of the focusing position caused by the ambient temperature change.;COPYRIGHT: (C)1999,JPO