| 摘要 |
PURPOSE:To drive independently a sector driving system and an exposure control system by controlling a photometric start time through a timer responding to the detection of an electric conduction of a shutter driving magnet. CONSTITUTION:When a release switch 2 is closed, an RS type FF 6 is set through a pulse generating circuit 5, a transistor 8 becomes on, and a sector driving magnet is brought to an electric conduction. This electric conduction is detected by a resistance 9, a monostable multivibrator 10 for forming a delaying timer is triggered, and after a set delay time elapses, an RS type FF 14 is set. Subsequently, a transistor 17 is turned off by a Q' output of the FF 14, and a photometry for charging a capacitor 18 by a photoconductive element 16 is started. According to this constitution, a sector driving system and an exposure control system can be driven independently, a shutter can be made small-sized, and also an adjustment against variations of a parts characteristic is also executed easily by changing the set delay time. |
