Electronic flash unit

Details Electronic flash unit Electronic flash unit

1974-11-11

1976-08-31

Rolinec, R. V.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315159, 315241P, H05B 3702

Patent

active

039783707

ABSTRACT:
Operation of the release contact causes a capacitor in the light measuring circuit to be connected to the D.C. supply. The voltage across the capacitor is applied to the gate of a thyristor in the ignition circuit. Only when the voltage across the capacitor has reached a value for proper operation of the exposure control circuit which terminates the flash, is sufficient voltage applied to the gate of the thyristor in the ignition circuit to cause it to fire, thereby causing the flashtube to ignite.

REFERENCES:
patent: 3519879 (1970-07-01), Ogawa
patent: 3541387 (1970-11-01), Ackermann
patent: 3683233 (1972-08-01), Heintze
patent: 3758822 (1973-09-01), Wilwerding

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