Photography – With object illumination for exposure – With insulated gate bipolar transistor
Patent
1997-03-19
1998-02-10
Blankenship, Howard B.
Photography
With object illumination for exposure
With insulated gate bipolar transistor
396206, 396159, 396160, 396205, 315241P, G03B 1505, H05B 3700
Patent
active
057179620
ABSTRACT:
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.
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MCT User's Guide (Harris); "P-Type MOS Controlled Thyristor" pp. 2-12 to 2-17 and 8-4 to 8-23, Harris Corporation, Dec. 1993.
Sasaki Toyoji
Yamada Hiroshi
Blankenship Howard B.
Dalakis Michael
Olympus Optical Co,. Ltd.
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