Title:
AIR-CORE COIL AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2003/105165
Kind Code:
A1
Abstract:
An air-core coil (21) is formed by one conductor wound in an eddy form so as to obtain a plurality of unit winding portions (25, 26, 27) formed continuously in the direction of the winding axis and having different inner circumferential lengths. A unit coil portion consisting of the unit winding portions (25, 26, 27) is repeatedly formed in the direction of the winding axis to prepare an intermediate coil product (20). The intermediate product (20) is compressed in the direction of the winding axis so that the unit winding portion having a smaller inner circumferential length is pushed into the unit winding portion having a larger inner circumferential length, thereby obtaining a multi-layered unit coil portion. By this air-core coil (21), it is possible to reduce the inter-layer voltage and improve the frequency characteristic as compared to the conventional coil.
Inventors:
YOSHIMORI HITOSHI (JP)
Application Number:
PCT/JP2002/012877
Publication Date:
December 18, 2003
Filing Date:
December 09, 2002
Export Citation:
Assignee:
SHT CORP LTD (JP)
YOSHIMORI HITOSHI (JP)
YOSHIMORI HITOSHI (JP)
International Classes:
H01F5/02; H01F27/28; H01F27/34; (IPC1-7): H01F30/00; H01F27/28; H01F17/03; H01F41/04
Foreign References:
| JPS55138823A | 1980-10-30 | |||
| JP2000277337A | 2000-10-06 |
Attorney, Agent or Firm:
Nishioka, Nobuyasu (1-13 Uchihonmachi 2-chome, Chuo-k, Osaka-shi Osaka, JP)
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