Radiation regulating device for an electronic flash device and m

Details Radiation regulating device for an electronic flash device and m Radiation regulating device for an electronic flash device and m

1994-07-18

1997-06-17

Metjahic, Safet

Photography

With object illumination for exposure

With insulated gate bipolar transistor

396155, 315241P, G03B 1503, H05B 3700

Patent

active

056406207

ABSTRACT:
With an electronic flash device that utilizes an IGBT, circuit construction can be simplified using a single condenser as both the trigger condenser of a trigger circuit and the voltage doubling condenser. In addition, because the recharging of the multi-purpose condenser is accomplished through the radiation current that flows through the light emitting tube directly after the collector/emitter gap of the IGBT becomes nonconductive, the device allows flash radiations to be repeated at high speed.

REFERENCES:
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 4951081 (1990-08-01), Hosomizu et al.
patent: 5075714 (1991-12-01), Hagiuda et al.
patent: 5111233 (1992-05-01), Yokonuma et al.
patent: 5159381 (1992-10-01), Harrison
patent: 5250977 (1993-10-01), Tanaka
patent: 5313247 (1994-05-01), Hosomizu et al.

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