The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
Sep. 27, 2004
Kenichi Saito, Echizen, JP;
Hisato Oshima, Fukui, JP;
Takaaki Ooi, Nagaokakyo, JP;
Toshinori Murakami, Fukui, JP;
Yoshimi Tanaka, Sabae, JP;
Kenichi Saito, Echizen, JP;
Hisato Oshima, Fukui, JP;
Takaaki Ooi, Nagaokakyo, JP;
Toshinori Murakami, Fukui, JP;
Yoshimi Tanaka, Sabae, JP;
Murata Manufacturing Co., Ltd, Kyoto, JP;
Abstract
A noise filter includes a capacitor having a hot side input terminal, a hot side output terminal, a ground side input terminal, and a ground side output terminal. A circuit board includes a hot side input electrode connected to the hot side input terminal, a hot side output electrode connected to the hot side output terminal, a ground side input electrode connected to the ground side input terminal, and a ground side output electrode connected to the ground side output terminal. The impedance of the ground side input terminal seen from the ground side output electrode is 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 formed between the ground side input electrode and the ground side output electrode is reduced by increasing a gap therebetween. Accordingly, excellent noise-reducing characteristics are provided.