LENS BARREL

摘要

PURPOSE:To improve optical precision and to move a lens group forward and backword by providing a supporting means such as a projection part around the center of gravity of a focus lens barrel. CONSTITUTION:A specifying projection part 4b (or 4c) is provided at a position which is considerred as the center of gravity of the focus lens barrel 4. Those specifying projection parts 4b and 4c constitute the supporting means for supporting the lens barrel at an inner circumferential part so that the external appearance of the lens barrel 4 may not be impaired. Those specifying projection parts 4b and 4c contact the fixed lens barrel 1 even when the lens group is moved outwardly.