Electronic pre-emission flash device

Details Electronic pre-emission flash device Electronic pre-emission flash device

1979-03-19

1981-03-17

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 315158, 354 25, 354 33, H05B 4134

Patent

active

042569958

ABSTRACT:
An electronic flash device capable of emitting a flash light of a regulated level over a considerable duration of time, prior to flash firing for emitting a torrent of flash light for flash photography. The device is provided with two capacitors, one of which is discharged through the flash tube and a current regulation circuit upon actuation of a first trigger switch, and the other of which, for example in relation to shutter release operation, is discharged through the flash tube without regulation of the discharge current upon subsequent actuation of a second trigger switch in relation to shutter opening. The pre-emission of flash light may be used for automatic focusing, automatic diaphragm determination and automatic flash control.

REFERENCES:
patent: 3681649 (1972-08-01), Uno et al.
patent: 3846811 (1974-11-01), Nakamura et al.

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