Static immunity for single touch flash charger control
AssigneeEastman Kodak Company
InventorDouglas W. Constable
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Abstract
An electronic flash device includes an illumination element, an actuation circuit having a flash capacitor providing energy releasable to illuminate the element, and a self-oscillating charging circuit, having a transistor, for charging the capacitor. The invention is characterized by a resistor located between a base of the transistor and ground for preventing the self-oscillating circuit from charging the capacitor when the flash device is exposed to an external static electric charge.
Claims6
An electronic flash device including an illumination element, an actuation circuit having a flash capacitor providing energy releasable to illuminate said element, and a self-oscillating charging circuit, having a transistor, for charging said capacitor, is characterized by:
- a resistor located between a base of the transistor and ground for preventing the self-oscillating circuit from charging the capacitor when the flash device is exposed to a static electric charge.
Dependencies are inferred from the claim text.