| 摘要 |
PURPOSE:To realize compact constitution, to make the quantity of projection from a camera body small, and to eliminate the probability that adverse influence is exerted upon a photographic optical device and a shutter device when an external force is applied by fixing a main optical system and the shutter unit on the base plate of a barrier unit independently. CONSTITUTION:A photographic lens consists of the main optical system 1 and a subordinate optical system 2 and a holding frame 3 which holds the main optical frame 1 is fixed to a shutter ground plate 5 which holds a stop shutter 4. This shutter ground plate 5 is fitted to the surface of the base plate 6 which is movable in the direction of an optical axis with a small screw 7. The barrier unit 8 is provided on the surface of the base plate 6 while sandwiched between an external cylinder 9 and the base plate 6 and the barrier unit 8 and external cylinder 9 are fixed on the base plate 6 with a small screw 10. Consequently, an external force applied to the front ring of the barrier unit and the external cylinder is never transmitted directly to the shutter unit and main optical system, and consequently there is no possibility that shutter accuracy and optical performance deteriorate.
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