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Title:
TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/2004/019353
Kind Code:
A1
Abstract:
A transformer includes a bar-shaped ferrite core, an internal winding wound directly around the ferrite core, an external winding wound on the internal winding, and an insulation shield surrounding the external winding. The external winding is covered with an insulation coating. At the intermediate portion between the winding start portion and the winding end portion of the external winding, the insulation coatings of adjacent external winding lines are apart along the axis of the ferrite core to leave a gap between them and this gap is filled with a molding material. Since the gap is provided between the insulation coatings of the external winding lines, the molding material forming the insulation shield can easily flow between the insulation coating of the external winding and the internal winding, thereby eliminating a vacant space between the internal winding and the external winding so as to obtain stable electric characteristic.

Inventors:
NAKANO TOMOYUKI (JP)
KINUTANI KAZUHIKO (JP)
OGASAWARA HIROSHI (JP)
IDA MIZUTO (JP)
NAKAMURA YOSHIHARU (JP)
Application Number:
PCT/JP2003/010326
Publication Date:
March 04, 2004
Filing Date:
August 13, 2003
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD (JP)
NAKANO TOMOYUKI (JP)
KINUTANI KAZUHIKO (JP)
OGASAWARA HIROSHI (JP)
IDA MIZUTO (JP)
NAKAMURA YOSHIHARU (JP)
International Classes:
H01F27/255; H01F27/28; H01F27/32; H01F17/04; (IPC1-7): H01F38/08; H01F27/28
Domestic Patent References:
WO2002023561A12002-03-21
WO2002023561A12002-03-21
Foreign References:
JPS56106433U1981-08-19
JPH02222509A1990-09-05
JP2000036416A2000-02-02
JPH05114529A1993-05-07
JPH0443615A1992-02-13
JPS60149221U1985-10-03
JPS55154514U1980-11-07
JPS4221407B11967-10-23
JP2000294427A2000-10-20
JP2000058343A2000-02-25
JPH0655229U1994-07-26
JPS56164510U1981-12-07
JPS5450922A1979-04-21
JPS6416719U1989-01-27
JPH0351806U1991-05-20
Other References:
See also references of EP 1544876A4
Attorney, Agent or Firm:
Nishikawa, Yoshikiyo (Umeda-Daiichiseimei Bldg. 5F 12-17, Umeda 1-chome, Kita-k, Osaka-shi Osaka, JP)
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