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US 4,082,984 AGranted
Electric flash device with printed coil transformer
AssigneeWest Electric Company, Ltd.
InventorHiroshi Iwata
Life of this patent
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Abstract
This invention relates to an improved small-sized electric flash device wherein transformers of its DC-DC converter circuit for producing a high voltage comprises printed coil or coils thereby efficiently reducing their volume and sufficiently flattering their shape, so that, together with miniaturized circuit parts and printed circuit substrate, highly integrated, hence compact photographic flash device is obtainable.
Claims10
An electric flash device comprising
- a battery,
- a transistorized DC-DC converter for converting D.C. output voltage of said battery to an output of an elevated D.C. voltage, which converter includes an oscillating transistor, at least one resistor, capacitors, a convertor transformer and a rectifying diode,
- a capacitor connected across the output terminals of said converter for accumulating said elevated voltage D.C. output of said DC-DC converter,
- a gas-discharge lamp connected across both ends of said capacitor so as to produce a flash of light when said charge accumulated in said capacitor is discharged upon receiving a trigger pulse and
- a trigger circuit comprising a trigger transformer for generating said trigger pulse to be impressed to said gas discharge lamp,
- wherein the improvement is that said converter transformer comprises at least one printed coil formed on an insulation substrate as a printed coil, at least one output coil formed by winding fine insulated wire and a magnetic core inserted in both center holes of said printed coil and said output coil, said printed coil and said output coil being disposed electromagnetically to couple to each other.
3 more elements
Dependencies are inferred from the claim text.