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:
Nov. 17, 2009
Filed:
May. 11, 2009
Tomonaga Nishikawa, Tokyo, JP;
Tomokazu Ito, Tokyo, JP;
Takeshi Okumura, Tokyo, JP;
Makoto Yoshida, Tokyo, JP;
Hiroshi Kamiyama, Tokyo, JP;
Sho Nakagomi, Tokyo, JP;
Tatsuya Karakame, Tokyo, JP;
Tomonaga Nishikawa, Tokyo, JP;
Tomokazu Ito, Tokyo, JP;
Takeshi Okumura, Tokyo, JP;
Makoto Yoshida, Tokyo, JP;
Hiroshi Kamiyama, Tokyo, JP;
Sho Nakagomi, Tokyo, JP;
Tatsuya Karakame, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A common mode filter is provided as one in a three-layered structure with improved high-frequency characteristics. The common mode filterhas the three-layered structure including a first coil layera second coil layerand a lead layerA first planar coiland a second planar coilof a substantially circular spiral shape are formed in the first and second coil layersrespectively. A first lead wireand a second lead wireformed in a lead layerhave a first straight portionc and a second straight portionc, respectively. The first straight portionc is located on a straight line Lperpendicular to a plurality of first tangent lines to spiralsat a plurality of respective intersection points with the spirals. The second straight portionc is located on a straight line Lperpendicular to a plurality of second tangent lines to the spiralsat a plurality of respective intersection points with the spirals