Electronic slave flash delay device

Details Electronic slave flash delay device Electronic slave flash delay device

1979-09-06

1981-09-01

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Electric switch controlled by the radiant energy responsive...

250214SF, 315151, 315152, 315155, H05B 4134

Patent

active

042874530

ABSTRACT:
A device for activating an electronic slave flash unit for photographic use includes a circuit wherein there is a delay circuit responsive to a light sensing signal after a predetermined time delay to activate a flash unit. The time delay of the delay circuit is adjustable as required, and the delayed operation of the flash of the slave flash unit eliminates incorrect impulse signals being transmitted to light sensors of other slave flash units which would otherwise prematurely extinguish their flash and give a resultant incorrect lighting effect. The power for the circuit is obtained from a capacitor which is energized by a flash unit. The energy in the capacitor is used to power the delay circuit, and a Zener diode and unijunction transistor and variable resistance permit accurate variable time delays.

REFERENCES:
patent: 3601652 (1971-08-01), Burnett
patent: 3636406 (1972-01-01), Ackermann
patent: 3944877 (1976-03-01), Sato

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