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US 2015/0084536 A1Published application
Electronic Flash Device
AssigneeNissin Industries Ltd.
InventorTak Wah SHUM
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Abstract
In an electronic flash device using a discharge flash tube (10) including a pair of discharge electrodes (14, 16) and a trigger electrode (18), an improvement is made to eliminate failures to emit flash light following a consecutive emitting of weak flash lights which is known to occur particularly when barium is used as the material for electron emission in the cathode (16) of the flash tube. A timing of applying the trigger voltage to the trigger electrode is delayed in relation to a timing of applying the discharge voltage to the discharge electrodes.
Claims3
An electronic flash device, comprising:
- a flash tube including a pair of discharge electrodes and a trigger electrode;
- a DC high voltage power source for generating a high voltage electric power;
- a main capacitor for storing high voltage electric charge supplied by the DC high voltage power source;
- a booster circuit for producing a discharge voltage to be applied to the discharge electrodes by increasing a voltage of the electric charge stored in the main capacitor;
- a trigger circuit for generating a trigger voltage to be applied to the trigger electrode;
- and
- a control unit for applying the discharge voltage and the trigger voltage to the discharge electrodes and the trigger electrode, respectively, in response to a shutter synchronization signal supplied from an external source;
- wherein the control unit is configured to delay a timing of applying the trigger voltage to the trigger electrode in relation to a timing of applying the discharge voltage to the discharge electrodes.
5 more elements
Dependencies are inferred from the claim text.