Flash device

Details Flash device Flash device

1994-04-04

1999-12-28

Adams, Russell

Photography

With object illumination for exposure

With insulated gate bipolar transistor

399205, 399206, G03B 1505

Patent

active

060092815

ABSTRACT:
A flash device comprising a power source; a main capacitor adapted to be charged by the power source; a flash firing unit operable to consume charge stored in the main capacitor to emit a flash light; a switching unit disposed in a discharge loop for the main capacitor through the flash firing unit; a trigger circuit for exciting the flash firing unit in response to a flash firing command; a pulse output unit, which is operable to output some kinds of pulses, the duty factors of the pulses being different from each other, for inputting a selecting command and For outputting one of the pulses in accordance with the selecting command; and a control unit for causing the switching unit to be switched on and off repeatedly in response to the pulse outputted from the pulse output unit.

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