Electronic flash apparatus

Details Electronic flash apparatus Electronic flash apparatus

1990-01-24

1991-06-25

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

354417, H05B 3700

Patent

active

050270397

ABSTRACT:
In an electronic flash apparatus, a flash preparation signal is sent from a signal generating means to a first switching device at a first timing preceding the flash emission, the first switching device is rendered conductive to start a resonant oscillation in a resonance circuit, thereby charging a trigger capacitor. If the flash preparation signal is terminated in the course of the resonance action, the first switching device is rendered non-conductive at a timing when the junction between the cathode of the flash discharge tube and the first switching device assumes a negative potential by the resonance action. Then, when a flash start signal is sent from the signal generating means to a second switching device at a second timing which is at least later than the above-mentioned timing, a trigger circuit is activated to supply the flash discharge tube with a trigger voltage, thereby starting the flash emission.

REFERENCES:
patent: 4085353 (1978-04-01), Adams
patent: 4591762 (1986-05-01), Nakamura
patent: 4608522 (1986-08-01), Yuasa

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