Photographic flash device

Details Photographic flash device Photographic flash device

1977-11-09

1980-08-12

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

354139, 354149, H05B 4132

Patent

active

042175232

ABSTRACT:
In a photographic flash device comprising a main capacitor (1) for storing a large electric energy, a gas-discharge flash tube (4) to be lit by the electric energy of the main capacitor (1), a switching circuit (5+9) which switches off the discharging of the flash lamp (1), a control circuit (20) which controls the switching circuit (5+9) in a manner to switch the switching circuit (5+9) off at a sending of a stopping signal from a triggering circuit (20) to the switching circuit (5+9), and a timer circuit which controls, responding to a selected guide number (G.N.) of flash photographing, the time period from the start of flashing of the flash tube (4) to a sending of a stopping signal to the control circuit (20) (namely the time period of flashing), the improvement is that the time period is adjusted responding to the voltage across the main capacitor (1).

REFERENCES:
patent: Re28783 (1976-04-01), Ackermann
patent: 3683233 (1972-08-01), Heintze
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3714872 (1973-02-01), Mashimo
patent: 3906292 (1975-09-01), Takahashi
patent: 3978370 (1976-08-01), Stieringer

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