Electric flash device

Details Electric flash device Electric flash device

1980-11-07

1983-05-03

La Roche, Eugene R.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Load device irradiating the radiant energy responsive device

315159, 315241P, H05B 4132

Patent

active

043822118

ABSTRACT:
An electronic flash device having a battery, means for converting the battery voltage to alternating current voltage, means for rectifying the alternating current voltage to direct current voltage, a main storage capacitor charged by the direct current voltage, a flash tube in parallel with the storage capacitor, a trigger circuit for firing the flash tube and a control circuit for stopping the flash operation of the flash tube when a predetermined amount of light has been reflected from an object to be photographed. The control circuit is actuated by a light measuring circuit which senses the reflected light. A switch element connects the light measuring circuit to the battery during activation of the flash tube.

REFERENCES:
patent: 4162426 (1979-07-01), Tsunekawa et al.
patent: 4204140 (1980-05-01), Willis
patent: 4224555 (1980-09-01), Ishikawa
patent: 4256994 (1981-03-01), Ikawa

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