Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
Patent
1988-12-09
1990-03-13
Groody, James J.
Electric lamp and discharge devices: systems
Condenser in the supply circuit
Condenser in shunt to the load device and the supply
315120, 315129, 315240, 315178, 3541451, H05B 3700, G03B 1505
Patent
active
049085522
ABSTRACT:
This invention concerns with an electronic flash unit in which, as two capacitors of large and small capacitances are charged, even when a trigger operation is actuated before the capacitor of large capacitance is fully charged, it is made possible with the help of the charge from the capacitor of small capacitance to fire the flash tube. Particularly in application of the invention to the above-described type of electronic flash unit, as the battery for use in charging the capacitors also serves to drive another load for a time which can fall in coincidence with the period of charging the capacitors, when the driving of the load is started, the charging of the capacitor of large capacitance is inhibited while the charging of the capacitor of small capacitance is permitted to go on, thereby it being made possible to carry out the driving of the load with high reliability so that the correct flash exposure is made while still maintaining the quickness of snap shots.
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patent: 4628229 (1986-12-01), Inoue
U.S. Patent Appln. Serial No. 761,194 in the name of Hiroyuki Kataoka, et al., filed Jul. 31, 1985, entitled "Flash Photographing Apparatus".
Canon Kabushiki Kaisha
Groody James J.
Powell Mark R.
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