US 12,462,971 B2
Coil component and manufacturing method therefor
Takuya Takeuchi, Tokyo (JP); Yuuichi Kawaguchi, Tokyo (JP); Masanori Suzuki, Tokyo (JP); and Naoaki Fujii, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Appl. No. 17/762,216
Filed by TDK Corporation, Tokyo (JP)
PCT Filed Sep. 24, 2020, PCT No. PCT/JP2020/035927
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/060332, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-173668 (JP), filed on Sep. 25, 2019.
Prior Publication US 2022/0375681 A1, Nov. 24, 2022
Int. Cl. H01F 27/30 (2006.01); H01F 27/02 (2006.01); H01F 27/29 (2006.01); H01F 27/32 (2006.01); H01F 41/04 (2006.01)
CPC H01F 27/327 (2013.01) [H01F 27/022 (2013.01); H01F 27/29 (2013.01); H01F 41/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A coil component comprising:
a magnetic element body made of resin containing magnetic particles;
a coil part embedded in the magnetic element body;
a conductor post which is embedded in the magnetic element body, the conductor post having a lower surface connected to the coil part, an upper surface exposed from the magnetic element body, and a side surface covered with the magnetic element body;
a first insulating layer having i) a first part interposed between the side surface of the conductor post and the magnetic element body and ii) a second part interposed between the lower surface of the conductor post and the coil part; and
a second insulating layer interposed between the coil part and the magnetic element body,
wherein the coil part and the conductor post are connected to each other through a via conductor penetrating the second part of the first insulating layer, and
wherein the via conductor has a diameter larger at a part contacting the coil part than that at a part contacting the lower surface of the conductor post.