Accidental flash prevention in a photographic flash device

Details Accidental flash prevention in a photographic flash device Accidental flash prevention in a photographic flash device

1977-09-08

1979-07-10

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

354145, H05B 4132

Patent

active

041609336

ABSTRACT:
In a photographic flash device comprising a flash discharge tube, for example a xenon discharge tube, a main capacitor which is connected across electrodes of said flash discharge tube and is for storing electric charge to be discharged in said flash tube, a triggering capacitor which is connected in series with a primary coil of a triggering transformer and a synchronous switch, and a voltage indicating glow discharge lamp for indicating completion of charging in the main capacitor.
A safety circuit for prohibiting accidental flashing is constituted by comprising a switching means which suspends function of said triggering capacitor.

REFERENCES:
patent: 3814985 (1974-06-01), Pecher et al.
patent: 3878433 (1975-04-01), Sato
patent: 3890538 (1975-06-01), Iwata et al.

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