Automatic control device for an electronic flash apparatus

Details Automatic control device for an electronic flash apparatus Automatic control device for an electronic flash apparatus

1975-08-15

1977-02-08

La Roche, Eugene

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

307252M, 315159, 315241P, H05B 4132

Patent

active

040073980

ABSTRACT:
A device for automatic control of the quantity of light from an electronic flash tube including a silicon controlled rectifier connected in series with the flash tube, a circuit for applying a reverse voltage between the main electrodes of said silicon controlled rectifier so as to open said rectifier, and a switching element connected between said reverse voltage applying circuit and said silicon controlled rectifier. Responsive to the output signal from the reverse voltage applying circuit, the switching element short-circuits the gate electrode and cathode of the rectifier. With this arrangement, it is possible to decrease the capacity of a commutation capacitor constituting part of the reverse voltage applying circuit.

REFERENCES:
patent: 3809951 (1974-05-01), Vital et al.
patent: 3835351 (1974-09-01), Schneider

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