公开(公告)号：US20180294090A1

公开(公告)日：2018-10-11

申请号：US15947682

申请日：2018-04-06

Applicant: TDK Corporation

Inventor： Tomonaga NISHIKAWA ,  Kouji KAWAMURA ,  Hidenori TSUTSUI ,  Mitsuo NATORI ,  Hitoshi OZAWA

IPC: H01F27/29 ,  H02M7/00 ,  H01F5/00

CPC classification number: H01F27/29 ,  H01F5/003 ,  H01F17/0033 ,  H01F27/292 ,  H01F2005/006 ,  H01F2017/0066 ,  H01F2017/046 ,  H02M7/003

Abstract: Disclosed herein is a coil component that includes a spiral conductor, a magnetic material layer covering the spiral conductor and having a through hole exposing an end of the spiral conductor, a through-hole conductor embedded in the through hole and has first region and second regions that are exposed from the magnetic material layer, a first conductor layer formed on an upper surface of the magnetic material layer and covering the first region of the through-hole conductor without covering the second region, and a second conductor layer covering the first conductor layer and the second region of the through-hole conductor, wherein the second conductor layer has a lower resistance than the first conductor layer.