| 摘要 |
The present invention relates to a diaphragm device for a camera, particularly making use of the property of matter in such a manner that the light permeable characteristics of the matter is changed by applying the control signal to the matter so as to form a light shading part and a light permeable part in order to control aperture. In case of the above-mentioned diaphragm device, a matter having property is sandwiched between the first electrode member consisting of a plural number of the electrode plates and the second electrode member, whereby the control signal is selectively applied to certain determined electrode plates in accordance with the aperture signal in such a manner that only the part of the matter facing to the selected electrode plates assumes the light shading state so as to form the light shading part and the light permeable part so that the aperture is controlled by means of the ratio of the area of the light shading part to that of the light permeable part. Consequently, the diaphragm device making use of the property needs a plural number of electrode plates, whereby in case they are provided in the interchangeable lens it is necessary to transmit the aperture signal to the lens mounted on the camera, namely it is necessary to provide the same number of the connecting terminals as that of the electrode plates, which is inconvenient. Taking the above inconvenience into consideration, the present invention is intended to make the number of the connecting terminals between the interchangeable lens and the camera body as small as possible in case the interchangeable lens is provided with the above-mentioned diaphragm device.
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