Air-core coil and process for fabricating the same

Details Air-core coil and process for fabricating the same Air-core coil and process for fabricating the same

2008-01-08

2008-01-08

Mai, Anh (Department: 2832)

Inductor devices

Coil with crossed turns

C336S190000, C336S222000

Reexamination Certificate

active

07317372

ABSTRACT:
The present invention provides an air-core coil21wherein one conductor is wound into a spiral form to thereby form consecutively, axially of the coil, a plurality of unit turn portions (25, 26, 27) which are different from each other in inner peripheral length and to form, axially of the coil, unit coil portions comprising the plurality of unit turn portions (25, 26, 27) to produce a partly finished coil20, and thereafter the partly finished coil20is compressed to force the unit turn portion of small inner peripheral length inwardly of the unit turn portion of great inner peripheral length from among the unit turn portions providing each of the unit coil portions to thereby make each of the unit coil portions multi-layered. Thus the air-core coil21exhibits a smaller voltage across layers than conventionally and excellent frequency characteristics.

REFERENCES:
patent: 3160838 (1964-12-01), Fahrettin
patent: 3705371 (1972-12-01), Van Nice
patent: 3983522 (1976-09-01), Gearhart
patent: 55-138823 (1980-10-01), None
patent: 58148414 (1983-09-01), None
patent: 04364011 (1992-12-01), None
patent: 2000-277337 (2000-10-01), None

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