| 摘要 |
A mechanical arrangement for electronically controlled photographic shutter, includes a ring rotatably mounted around the exposure aperture of the camera and, a pair of shutter blades coupled to each other and rotatably mounted respectively on fixed pins extending from said ring, one of which blades having an urging spring mounted thereon to act in the opening direction, a cam face adapted to be brought into engagement with said one of the blades having an urging spring in accordance with the movement of said ring to impart the blades a motion to open progressively, and a closing member capable of engaging, whenever a proper exposure has been obtained, the spring urged blade even in the midst of the blade's opening motion by the action of an electromagnet connected to an electronic exposure time control circuit thereby coercively displacing the shutter blades toward the closing directions. The above described arrangement is operative so that, upon generation of an electric signal indicating the completion of an exposure, the exposure aperture is closed without delay.
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