Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1997-01-28
1998-07-14
Nguyen, Matthew V.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
363 18, H05B 3700, H02M 3335
Patent
active
057809763
ABSTRACT:
This invention is designed to reduce the number of parts in the circuits of a constant-voltage automatic charging strobe circuit, thus reducing the cost. In addition, it allows a user to decide when to use the strobe flash. In a oscillation charge/discharge circuit, an oscillation startup switch is installed between a battery and a transistor through the primary coil of a step-up transformer. When the switch is closed, the direct current input to the transistor is suppressed, and an abnormal input current control resister may have a low resistance value. A trigger flash circuit comprises a circuit that both controls the constant-voltage flash of a neon lamp NE and controls the oscillation stop of the transistor. A recharge circuit comprises a circuit that uses the resistor in the primary coil of the step-up transformer and a capacitor that takes out pulse fluctuations when the xenon lamp Xe is flashed. This invention also has a switch mechanism which forms a charging route in the main capacitor under normal conditions, and which acts to start the flash of the flash element and prevent recharging when the camera shutter is operated. A main capacitor can be charged when the oscillation startup switch is operated only when the user wants to use the strobe.
REFERENCES:
patent: 3777212 (1973-12-01), Mashimo
patent: 4163178 (1979-07-01), Hosono
patent: 4305649 (1981-12-01), Nagaoka et al.
patent: 4942340 (1990-07-01), Ikawa
patent: 5187410 (1993-02-01), Shimizu et al.
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