Title:
ノイズフィルタの実装構造
Document Type and Number:
Japanese Patent JP4241732
Kind Code:
B2
Abstract:
A noise filter (21) includes a capacitor (22) having a hot side input terminal (28), a hot side output terminal (29), a ground side input terminal (32), and a ground side output terminal (33). A circuit board (51) includes a hot side input electrode (58) connected to the hot side input terminal, a hot side output electrode (59) connected to the hot side output terminal, a ground side input electrode (60) connected to the ground side input terminal, and a ground side output electrode (61) connected to the ground side output terminal. The impedance of the ground side input terminal seen from the ground side output electrode is set to be larger than both the impedance of the ground side output terminal seen from the ground side output electrode and the impedance of the hot side output terminal seen from the ground side output electrode. For this purpose, a stray capacitance (64) formed between the ground side input electrode (60) and the ground side output electrode (61) is reduced by increasing a gap (a) therebetween. Accordingly, excellent noise-reducing characteristics are provided.
Inventors:
Kenichi Saito
Norihito Oshima
Takaaki Oi
Murakami Toshinori
Ryomi Tanaka
Norihito Oshima
Takaaki Oi
Murakami Toshinori
Ryomi Tanaka
Application Number:
JP2005516272A
Publication Date:
March 18, 2009
Filing Date:
September 27, 2004
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H03H7/075; H01F27/00; H01F27/29; H01G4/35; H01G4/40; H03H1/00; H03H7/01; H05K1/02; H01F17/06; H01F27/40; H05K1/18
Domestic Patent References:
| JP2018587Y2 | ||||
| JP59204307A | ||||
| JP64036112A | ||||
| JP59015319A | ||||
| JP10224175A | ||||
| JP2001094376A |
Attorney, Agent or Firm:
Masaaki Koshiba