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Title:
COIL, AND ANTENNA AND TRANSFORMER USING THE COIL
Document Type and Number:
WIPO Patent Application WO/2005/078749
Kind Code:
A1
Abstract:
The differences in characteristics among parts or the variation of the inductance value of a coil due to temperature variation is lessened by reducing the stray capacitance components induced among the layers of wound conductor, and size reduction and cost reduction are achieved. A winding portion (30) between two flange portions (22a, 22b) is divided into sections (30a, 30b, 30c, 30d). One layer of conductor is wound from one end to the other in each section, and then layers of conductor are wound in the alternately reversed directions to form the multilayer winding portion (30) by solenoid winding. The conductor is preferably wound in such a way that the border surface between adjacent sections inclines so that the layers of wound conductor are nearer to the flange portion of the winding start from the bottom layer to the top layer. Further the conductor is preferably wound in such a way that at least in a part of the end face at the upper layers and their neighbors opposed to each flange portion, the layers are farther from the flange portion from the bottom layer to the top layer in each section at both ends. This divided solenoid winding coil can be used for an antenna coil or a transformer coil.

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Inventors:
MORIMOTO YASUNORI (JP)
KURIKI HIROMITU (JP)
Application Number:
PCT/JP2004/019399
Publication Date:
August 25, 2005
Filing Date:
December 24, 2004
Export Citation:
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Assignee:
SUMIDA CORP (JP)
MORIMOTO YASUNORI (JP)
KURIKI HIROMITU (JP)
International Classes:
H01F17/04; H01Q7/00; H01Q7/08; H01F41/06; (IPC1-7): H01F17/04; H01Q7/08
Foreign References:
JPH03192708A1991-08-22
JPH08222464A1996-08-30
JPH02156513A1990-06-15
JPS59126610A1984-07-21
JPH09129460A1997-05-16
JPH06333757A1994-12-02
JP2004048136A2004-02-12
JP2003332822A2003-11-21
JPS59126610A1984-07-21
Other References:
See also references of EP 1727163A4
Attorney, Agent or Firm:
Kawano, Hiroshi (22-1 Nishi-Shinjuku 1-chom, Shinjuku-ku Tokyo 23, JP)
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