| 摘要 |
PURPOSE:To prevent effectively the overshooting of a shutter blade or mechanical collision and to obtain stabilized operating state, by applying integrating waveform voltage of a square wave to an electric distortion element in an exposure control device using mechanical distortion generated in the electric distortion element by applying a voltage as a driving source. CONSTITUTION:When a power supply is turned on and a trigger switch 16 is also turned on, a pulse appears from the output of a one-shot multivibrator 12 with pulse width specified by a variable resistor 11 for specifying a shutter speed. The output pulse is turned to amplitude set up by a variable resistor 14 interlocking with a diaphragm ring and a driving pulse for obtaining prescribed shutter seconds and a diaphragm's aperture is outputted from the output of a non-inversion amplifier 13. A square wave integrated by a resistor 15 inserted in series to the electric distortion element 1 is applied to the electric distortion element. Thus, the displacement of the electric distortion element 1 generated by the application of the voltage having a CR integrating waveform is transmitted to the shutter blade and the shutter blade is actuated by following the displacement of the electric distortion element 1 due to the application of the CR integrating waveform voltage.
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