Electronic flash apparatus

Details Electronic flash apparatus Electronic flash apparatus

1991-02-06

1991-12-24

Adams, Russell E.

3541451, G03B 1505

Patent

active

050757148

ABSTRACT:
An electronic flash apparatus uses a voltage-controlled switching device, such as an insulated gate bipolar transistor, for controlling the start and termination of flash emission from a flash discharge tube. A peak voltage of an oscillation generated in a resonant circuit, produced in response to a flash emission start command, is clamped by a clamping circuit and is used to turn on the voltage-controlled switching device. Another resonant circuit may be used for doubling the voltage between the anode and cathode of the flash discharge tube when the flash discharge tube is triggered.

REFERENCES:
patent: 4839686 (1989-06-01), Hosomizu et al.
patent: 4935759 (1990-06-01), Tsuji

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