Flash light control circuit

Details Flash light control circuit Flash light control circuit

1990-10-23

1992-05-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315241P, 3541451, H05B 4132

Patent

active

051151693

ABSTRACT:
An object of the invention is to provide a flash light control circuit by which a flash bulb is controlled to maintain a constant quantity of emitted light at each flash, in order to counter an insufficient exposure of a photographic object, caused by a gradual decrease of emitted light with the progress of exposures, for example, in photography with a camera on a multi exposure basis.
The object is achieved by a flash light control circuit comprising a trigger circuit that impresses a trigger voltage onto a trigger terminal of the flash bulb and comprising a non-self hold type switching element connected to the trigger circuit, which is turned on for discharging energy stored in a main capacitor into the flash bulb for its consequent flashing, wherein there is provided a pulse generating circuit that impresses, onto a gate terminal of the switching element, continual pulse signals whose duty ratios increase gradually.

REFERENCES:
patent: 4302707 (1981-11-01), Hattori
patent: 4652108 (1987-03-01), Iida et al.

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