Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1981-04-28
1983-07-12
La Roche, Eugene
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315219, 315240, 354145, H05B 4132
Patent
active
043933351
ABSTRACT:
In an electronic flash device of the type in which depending upon the exposure conditions an electronic flash lamp converts into light the energy stored on a main flash capacitor or the energies stored not only on the main flash capacitor but also on an auxiliary flash capacitor, a switching element which is turned on or off so as to permit or interrupt the discharge of the auxiliary flash capacitor is controlled by a simplified control circuit comprising a switching element control circuit which delivers a low voltage supplied from a low-voltage power source to the switching element as a turn-on signal and a detection circuit which controls the switching element control circuit in response to the exposure conditions such as a distance to a subject or a selected aperture. Therefore, an inversion circuit which is used in the prior art electronic flash devices can be eliminated.
REFERENCES:
patent: 3864601 (1975-02-01), Schneider
patent: 4323822 (1982-04-01), Yakematsu
Hirata Shinji
Ina Hirohiko
La Roche Eugene
West Electric Co. Ltd.
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