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:
Oct. 03, 2006
Filed:
Nov. 28, 2003
Yoshie Nishikawa, Fukui, JP;
Kiyoteru Igashira, Takefu, JP;
Takaaki Ooi, Takefu, JP;
Tatsuyuki Yamada, Fukui-ken, JP;
Hideki Kumatani, Yokohama, JP;
Yoshie Nishikawa, Fukui, JP;
Kiyoteru Igashira, Takefu, JP;
Takaaki Ooi, Takefu, JP;
Tatsuyuki Yamada, Fukui-ken, JP;
Hideki Kumatani, Yokohama, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A first winding of a choke coil is closely wound in a single layer on the outer periphery of a substantially cylindrical body portion of a first bobbin. A second winding is closely wound in a single layer over the first winding. A third winding is closely wound in a single layer on the outer periphery of a substantially cylindrical body portion of a second bobbin. A fourth winding is closely wound in a single layer over the third winding. The first, second, third and fourth windings are wound so as to mutually strengthen magnetic fluxes when an in-phase noise current flows. The first and second windings are connected to a pair of signal lines via which differential transmission communication is performed and on which a power supply current is sent out. The third and fourth windings are connected to a pair of signal lines via which differential transmission communication is performed and on which the power supply current returns. Thus, a circuit including a compact choke coil having large inductance and better high-frequency characteristics, and the choke coil is provided.