| 摘要 |
<p>PURPOSE:To prevent malfunction exposure by regenerating the electromagnetic release signal annihilated by the leading edge only at the photographing suited state. CONSTITUTION:When the output of a comparator 8 inverts to a high level along with shutter operation, a capacitor 14 i charged during the time constant period by a capacitor 14 and resistance 13 by way of inverters 10, 12, during which time a comparator 15 generates the electromagnetic release signal of a high level. An SCR20 then conducts and an FF19 is set by the negative differentiated output from the differentiating circuit formed by a capacitor and resistance, by which the comparator 8 is inhibited and the electromagnetic release signal annihilates at the leading edge. On the other hand, when the terminal voltage of a battery 1 is above the specified and is in a photographing suited state, the high level signal from a voltage judgement circuit 25 resets the FF19 through the AND gate 26 which opens at the setting of the FF19, thereby releasing the inhibition of the comparator 8. At the same time, the FF19 assumes the state where it is not reset, thus the exposure control free from malfunction is accomplished by the electromagnetic release signal which outputs again only at the photographing suited time.</p> |
