| 摘要 |
A diaphragm control device for use in an interchangeable lens of a single lens reflex camera. A motor for driving diaphragm blades includes a coil, a rotor, and a stator which are arranged in a diaphragm device comprising a ring-shaped disc with diaphragm blades that open and close an optical path hole provided in a central portion thereof. The rotor and stator are disposed on the surface of a ring-shaped disc between the periphery of the opening and the outer periphery of the diaphragm device. The shaft of the rotor, the coil, and the stator are positioned in parallel with the axis of the opening, and the rotor and the coil are arranged in a parallel arcuate row on the surface of the ring-shaped disc. The present invention provides a diaphragm device which, when installed in the lens barrel, has reduced size and makes it possible to drive the diaphragm blades with high torque.
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