Patent ID: 7933082
Filing Date: 2011-04-26
Classification: G02B

Abstract:
1. A lens device comprising: a lock mechanism, wherein the lock mechanism includes: a cylindrical operating ring that operates a position of a movable lens which is provided in an optical system for forming an object image or open/closed positions of an openable stop, the cylindrical operating ring being arranged so as to be rotated relative to an inner member provided therein; a hole that is formed in the operating ring so as to pass through an outer circumferential surface and an inner circumferential surface of the operating ring, the hole being elongated in a circumferential direction; a lock knob that includes a spacer member that includes wherein, when the lock knob is rotated to fit the shaft portion into the screw hole of the inner member and the seating surface of the base portion of the spacer member is pressed against the outer circumferential surface of the operating ring, the rotation of the operating ring is regulated and the position of the operating ring is fixed.