Frishauf, Holtz, Goodman, Langer & Chick
Electric flash apparatus using MOS controlled thyristor
 A power supply circuit includes a booster circuit for boosting an output voltage from a power supply battery to predetermined positive and negative voltages, respectively. A main capacitor is charged by the predetermined positive or negative voltage boosted by the power supply circuit. In a discharge tube, a discharge current flows on the basis of the charge built up on the main capacitor, so that flash light emission is performed. A MOS controlled thyristor (MCT) is inserted in the loop of the discharge current from the main capacitor. A control circuit ON/OFF-controls the MCT by selectively applying the predetermined positive or negative voltage from the power supply circuit to the gate terminal of the MCT. 
Olympus Optical Co., Ltd.
G G H
G03B G03B H05B
inventional additional inventional
Toyoji Hiroshi
Sasaki Yamada