Electronic flash device with capacitor discharge cut-off before

Details Electronic flash device with capacitor discharge cut-off before Electronic flash device with capacitor discharge cut-off before

1975-09-15

1977-03-15

La Roche, Eugene

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315151, 315340, 354145, H05B 4132, H05B 4129

Patent

active

040126650

ABSTRACT:
The time period necessary to charge a current-to-light convertible energy storing capacitor to a certain voltage is reduced as compared with prior art devices. The energy storing capacitor is connected across a flash tube and switching element series-connected with each other. The switching element is provided with a control circuit, responsive to the voltage of the storage capacitor decreasing to a level at which the flash tube is stopped from producing flash light, for producing a terminating signal by which the switching element is brought into the open or non conducting state. With this arrangement, it is made possible to prevent complete discharge of the electric charge stored in the storage capacitor from occurring, thereby providing the advantage of saving a good fraction of the charging time period which would be otherwise necessary when the storage capacitor is completely discharged to zero voltage.

REFERENCES:
patent: 3878433 (1975-04-01), Sato

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