Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1976-03-15
1977-05-10
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315360, 320 1, 354145, H05B 4132
Patent
active
040230686
ABSTRACT:
An electronic flash device includes a control circuit for extending the operational life of the flash battery. In one preferred embodiment the flash device is of the type having a monitor circuit responsive to the charge on the flashtube firing capacitor that (1) operably couples the flash battery to a charging circuit when the charge on the firing capacitor is below a predetermined level, and (2) de-couples the battery from the charging circuit when the firing capacitor charge is above the predetermined level. The control circuit comprises a counter for counting the number of times the monitor circuit couples the battery to the charging circuit and for producing a control signal, when the number counted reaches a pre-set value, that overrides the monitor circuit to maintain the battery de-coupled from the charging circuit. In a second preferred embodiment the flash device comprises a time-delay control circuit that de-couples the flash battery from the charging circuit a predetermined interval after the firing capacitor is initially charged to a level adequate to flash the flashtube.
REFERENCES:
B501,503, Mar. 1976, Biber 315/241 P.
Eastman Kodak Company
LaRoche Eugene R.
Monteith D. P.
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