Electronic flashing device

Details Electronic flashing device Electronic flashing device

1995-06-07

1998-05-12

Adams, Russell E.

Photography

With object illumination for exposure

With insulated gate bipolar transistor

396159, 396206, G03B 1505

Patent

active

057521026

ABSTRACT:
An electronic flashing device includes a booster circuit for boosting a power supply voltage to a predetermined voltage, a main capacitor charged via the booster circuit, a light emission tube for emitting light according to a charge charged on the main capacitor, a semiconductor element connected in series with the light emission tube, and including a thyristor element and a MOSFET which are cascade-connected to each other, and are formed on a single chip, a trigger circuit for applying a trigger voltage to the light emission tube in response to a light emission start signal for causing the light emission tube to start light emission, a gate voltage applying circuit for applying a voltage to the gate of the semiconductor element in response to the light emission start signal, and a gate voltage disappearing circuit for causing the voltage at the gate of the semiconductor element to disappear in response to a light emission stop signal for causing the light emission tube to stop light emission. A series circuit of the light emission tube and the semiconductor element is connected in parallel with the main capacitor.

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patent: 5250977 (1993-10-01), Tanaka
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