US 11,810,704 B2
Multilayer coil component
Hidekazu Sato, Tokyo (JP); Takahiro Sato, Tokyo (JP); Hitoshi Kudo, Tokyo (JP); Takashi Endo, Tokyo (JP); Yusuke Nagai, Tokyo (JP); Tatsuro Suzuki, Tokyo (JP); Hiroko Korikawa, Tokyo (JP); and Kenji Komorita, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Oct. 29, 2019, as Appl. No. 16/666,555.
Claims priority of application No. 2018-204162 (JP), filed on Oct. 30, 2018.
Prior Publication US 2020/0135375 A1, Apr. 30, 2020
Int. Cl. H01F 17/00 (2006.01); H01F 27/28 (2006.01); H01F 5/00 (2006.01); H01F 27/29 (2006.01); H01F 17/04 (2006.01); H01F 41/04 (2006.01)
CPC H01F 17/0013 (2013.01) [H01F 5/003 (2013.01); H01F 17/04 (2013.01); H01F 27/2804 (2013.01); H01F 27/292 (2013.01); H01F 41/046 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A multilayer coil component comprising:
an element body formed of ceramic element materials; the element body having a multilayer structure including:
a first element body portion formed of a first ceramic mangetic material; and
a second element body portion laminated on the first element body portion and formed of a second ceramic magnetic material having a composition different from that of the first ceramic magnetic material;
a multilayer coil having an axis parallel to a lamination direction of the element body; and
a stress alleviation portion provided in an inner region of an inner edge of the multilayer coil when viewed from the lamination direction, wherein
the stress alleviation portion does not overlap with the multilayer coil in the lamination direction, and the stress alleviation portion is a material-filled layer into which zirconia is filled;
an intermediate layer formed of a mixed composition material including the first ceramic magnetic material and the second ceramic magnetic material between the first element body portion and the second element body portion;
the stress alleviation portion is in contact with the intermediate layer in the lamination direction.