| 摘要 |
PROBLEM TO BE SOLVED: To enhance the positional accuracy of prism attachment to a prism attaching lens barrel, to keep the accuracy for a long term, and to reduce the cost for attaching the prism to the prism attaching lens barrel. SOLUTION: In the prism attaching lens barrel 3, an inserting port 4c by which the prism 15 is inserted inside the lens barrel 3, a receiving recessed part 8 provided on an inside surface side and also opening in the direction of the port 4c, and a receiving surface 9 on the inside surface of which the prism 15 abuts are formed. An angular part 19 where a reflecting surface 16 crosses with an incident surface 17 or a light emitting surface 18 in the prism 15 inserted from the port 4c is engaged with the part 8, and also the surface 18 abuts on the receiving surface 9, the surface 18 or the surface 17 is pressed by an elastic member 20 from the inserting direction of the prism 15, and the engagement of the part 19 with the part 8 and the abutting of the surface 18 on the surface 9 are kept by repulsive force, so that the prism 15 is attached to the lens barrel 3. |
