US 12,243,675 B2
Multilayer coil component
Yusuke Nagai, Tokyo (JP); Takashi Suzuki, Tokyo (JP); Kazuhiro Ebina, Tokyo (JP); Kunihiko Kawasaki, Tokyo (JP); Shinichi Kondo, Tokyo (JP); Keito Yasuda, Tokyo (JP); Ryuichi Wada, Tokyo (JP); Makoto Morita, Tokyo (JP); Takashi Kudo, Tokyo (JP); and Kyohei Tonoyama, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Sep. 30, 2021, as Appl. No. 17/490,893.
Claims priority of application No. 2020-167762 (JP), filed on Oct. 2, 2020.
Prior Publication US 2022/0108836 A1, Apr. 7, 2022
Int. Cl. H01F 5/00 (2006.01); H01F 17/00 (2006.01); H01F 17/04 (2006.01); H01F 27/29 (2006.01)
CPC H01F 27/292 (2013.01) [H01F 17/0013 (2013.01); H01F 17/04 (2013.01); H01F 2017/048 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A multilayer coil component comprising:
an element body containing a plurality of metal magnetic particles;
a coil disposed in the element body; and
an external electrode disposed so as to cover an end surface of the element body and electrically connected to the coil, wherein
a part filled with a resin and a void part not filled with the resin exist between the plurality of metal magnetic particles in the element body,
one surface of the element body other than the end surface is a mounting surface with respect to an external electronic component and an edge of the external electrode is positioned on the mounting surface,
a high void region where porosity caused by the void part is higher than porosity of another part in the element body extends from the edge of the external electrode on the mounting surface toward the end surface of the element body in the element body, and
the high void region has a formation depth extending from the mounting surface along a direction orthogonal to the mounting surface, and the formation depth of the high void region increases from the edge of the external electrode toward the end surface.