Patent ID: 8144400
Filing Date: 2012-03-27
Classification: G02B

Abstract:
1. A lens apparatus comprising: a lens barrel; a fixed stopper fixed to the lens barrel; an optical unit moving in a direction of an optical axis relative to the lens barrel; a cylindrical grooved cam which includes a stopper restrictor and is held in the lens barrel to be rotatable about a rotation axis parallel to the optical axis, for restricting movement of the optical unit in the direction of the optical axis; and a movable stopper which is movable within a range of the stopper restrictor, wherein the movable stopper is in contact with the stopper restrictor and the fixed stopper to restrict a rotation range of the cylindrical grooved cam; wherein the movable stopper is held inside a cylindrical surface of the cylindrical grooved cam to be rotatable coaxially with the cylindrical grooved cam and to be detachably attachable, wherein the stopper restrictor is an end portion of an opening provided in the cylindrical surface of the cylindrical grooved cam; wherein the movable stopper protrudes from the cylindrical surface of the cylindrical grooved cam through the opening; and wherein the movable stopper is in contact with the end portion of the opening and an end surface of the fixed stopper to restrict the rotation range of the cylindrical grooved cam.