Lens barrel

摘要

A lens barrel with a stationary frame fixed relative to a camera body; a flare diaphragm movable in a direction of an optical axis for cutting off harmful incident light; an urging spring urging the flare diaphragm in the direction of the optical axis; a third group frame including a protruding portion which is driven into abutting contact with the flare diaphragm to restrict a position of the flare diaphragm in the direction of the optical axis, the third group frame being moved in the direction of the optical axis; and, a supporting shaft rigidly positioned on the stationary frame. The supporting shaft guides the movable flare diaphragm in the direction of the optical axis, while being snugly fitted to the flare diaphragm. In addition, the supporting shaft includes a stepped front portion for restricting such movement of the flare diaphragm to a predetermined position.