发明授权
US4338014A Electromagnetically driven shutter 失效
电磁驱动快门

Electromagnetically driven shutter
摘要:
In the disclosed electromagnetically driven shutter, a leading shutter member and a trailing shutter member are driven by respective electromagnetic drive sources through an exposure operation and a return operation. Selector switches supply drive current from a battery to electromagnetic coils of the drive sources and control the direction of the drive current. After an exposure operation, a relay sets the switches for a return operation and resets the switches for exposure. Preferably, the relay is controlled by signals delayed by different delay times from the termination of the exposure operation so as to set the switches correctly.
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