Title:
VEHICLE-MOUNTED NOISE FILTER
Document Type and Number:
WIPO Patent Application WO/2010/137492
Kind Code:
A1
Abstract:
Disclosed is a vehicle-mounted noise filter capable of suppressing electric field coupling between a pair of capacitors in the FM radio band, thereby allowing the intrinsic noise attenuation performance of a noise filter circuit to be exerted even in the FM radio band. The vehicle-mounted noise filter comprises a ground plate (1), a coil (2), a pair of capacitors (3a, 3b), and a conductive shielding plate (4). The ground plate (1) is grounded in a vehicle body. A lead wire is wound around the coil (2). The pair of capacitors (3a, 3b) are disposed such that the coil (2) is interposed therebetween, and are electrically connected to the coil (2) and the ground plate (1) so as to form a π-type filter circuit. The conductive shielding plate (4) is grounded in the ground plate (1) and is disposed between the pair of capacitors (3a, 3b) so as to shield the electric field coupling between the pair of capacitors (3a, 3b).
Inventors:
NISHIOKA YASUHIKO (JP)
KOBAYASHI HIDEKAZU (JP)
KOBAYASHI HIDEKAZU (JP)
Application Number:
PCT/JP2010/058364
Publication Date:
December 02, 2010
Filing Date:
May 18, 2010
Export Citation:
Assignee:
HARADA IND CO LTD (JP)
NISHIOKA YASUHIKO (JP)
KOBAYASHI HIDEKAZU (JP)
NISHIOKA YASUHIKO (JP)
KOBAYASHI HIDEKAZU (JP)
International Classes:
H03H7/01; H01F27/00
Domestic Patent References:
| WO2007020902A1 | 2007-02-22 |
Foreign References:
| JPH1140920A | 1999-02-12 | |||
| JPS55138913A | 1980-10-30 | |||
| JPH0232223U | 1990-02-28 | |||
| JPH04257111A | 1992-09-11 | |||
| JP2004153502A | 2004-05-27 |
Attorney, Agent or Firm:
NAMAI, Kazuhira (JP)
Wahei Namai (JP)
Wahei Namai (JP)
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