External power source for electronic flash

Details External power source for electronic flash External power source for electronic flash

1991-02-05

1992-09-08

Gellner, Michael L.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

354147, 315241P, G03B 1505

Patent

active

051462508

ABSTRACT:
An external power source, for an electronic flash unit, includes a battery, a voltage step-up circuit for starting a voltage step-up operation of the battery voltage in response to a start signal and terminating the step-up operation in response to a stop signal, a voltage detecting circuit for detecting that the output voltage of the voltage step-up circuit has reached a predetermined value, and a voltage step-up control circuit for releasing the start signal and the stop signal. The control circuit releases the start signal in response to a synchronization signal from the camera or in response to the detection of flash emission by a flash detecting circuit, and releases the stop signal upon detection by the detecting circuit that the output voltage has reached the predetermined value.

REFERENCES:
patent: 4430602 (1984-02-01), Ohmori

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