| 摘要 |
<p>PURPOSE:To obtain an automatic stroboscope which is capable of sufficiently corresponding to an aperture variation of a camera by varying the aperture in various ways, by varying a reference value, namely, a threshold level, for generating a stop signal, by comparing it with an integration value of an integration capacitor. CONSTITUTION:When a shutter is pushed, a flash synchro contact 15 is closed, a transistor 16 becomes on, a capacitor 19 is charged by turning on an SCR 18, and by its voltage, voltage is generated in a Zener diode 20. Subsequently, its rise characteristic is improved by a capacitor 21, and it rises in almost 5musec. Accordingly, the voltage of a threshold level also rises in the same way, by which voltage of the photometric circuit is stabilized before the photometry is started, and also the threshold level can be stabilized. During this time, the voltage of the capacitor 19 is applied to the gate of an SCR9 through a delaying circuit, the SCR9 becomes on by being delayed by a prescribed time, voltage is applied to the gate of an SCR4 through a commutating capacitor 5 by starting a discharge tube 3, and discharge is started by turning it on.</p> |
