| 摘要 |
An aperture regulating apparatus includes a moving barrel moving straight in an optical axis direction, a rotation barrel rotatably held by the moving barrel, a cam member movably fitted on the moving barrel, and a shutter unit movably contained in the moving barrel. In moving the moving barrel in the optical axis direction by magnifying operation, the rotation barrel moves in the optical axis direction with the moving barrel with rotation, and the cam member moves in the optical axis direction on an outer surface of the moving barrel in accordance with rotation of the rotation barrel. The shutter unit has a regulation lever getting in rotational range of shutter blades. The regulation lever is displaced according to movement of the cam member to control a rotational amount of the shutter blades. An aperture size is regulated according to a focal length of a taking lens.
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