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Patent Searching and Data


Title:
COMMON MODE NOISE FILTER
Document Type and Number:
WIPO Patent Application WO/2019/188215
Kind Code:
A1
Abstract:
Provided is a common mode noise filter with which it is possible to improve an attenuation characteristic with respect to common mode noise in a wide frequency region. The common mode noise filter of the present disclosure is provided with: a magnetic material portion (11) and a magnetic material portion (12) which are configured from a magnetic material; and a non-magnetic material portion (13) which is sandwiched between the magnetic material portion (11) and the magnetic material portion (12) in a stacking direction and is configured from a non-magnetic material. The common mode noise filter is further provided with: a coil (14) and a coil (15) which are disposed in the non-magnetic material portion (13) and are opposed to each other; and a metal layer (16) which is formed in at least one of the magnetic material portion (11) and the magnetic material portion (12), and is connected to ground. The metal layer (16) is positioned closer to a lower surface rather than an upper surface of the magnetic material portion (11), and closer to an upper surface rather than a lower surface of the magnetic material portion (12).

Inventors:
KAWASHIMA Takuji
ISHIDA Nariaki
TANAKA Hideki
Application Number:
JP2019/009775
Publication Date:
October 03, 2019
Filing Date:
March 11, 2019
Export Citation:
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Assignee:
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. (1-61, Shiromi 2-chome Chuo-ku, Osaka-sh, Osaka 07, 〒5406207, JP)
International Classes:
H03H7/09; H01F17/00; H01F27/00
Foreign References:
JP2016219606A2016-12-22
JP2012248917A2012-12-13
JP2017046169A2017-03-02
JP2017050401A2017-03-09
Attorney, Agent or Firm:
KAMATA Kenji et al. (1-61, Shiromi 2-chome, Chuo-ku, Osaka-sh, Osaka 07, 〒5406207, JP)
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