Electronic photographic flash apparatus

Details Electronic photographic flash apparatus Electronic photographic flash apparatus

1976-11-22

1978-05-23

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315134, 315135, 315159, 315241P, H05B 4132

Patent

active

040913082

ABSTRACT:
An electronic flash unit for photographic purposes, with improved means for quenching the flash when sufficient light has been emitted from the flash tube. The discharge circuit of the main storage capacitor comprises the flash tube and a switch thyristor in series with each other. A quench circuit including a quenching capacitor and a quenching thyristor will deliver a quenching current to the switch thyristor when the quenching thyristor is triggered by exposure metering and flash limiting mechanism, this mechanism including a resistor, a phototransistor, and an integrating capacitor in series with each other and in parallel with a feed capacitor which supplies feed current to the exposure metering and flash limiting mechanism, and which is in parallel with the switch thyristor.

REFERENCES:
patent: 3783336 (1974-01-01), Vital et al.
patent: 3835351 (1974-09-01), Schneider
patent: 3947720 (1976-03-01), Breitkreuz

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