公开(公告)号：US11810704B2

公开(公告)日：2023-11-07

申请号：US16666555

申请日：2019-10-29

Applicant: TDK CORPORATION

Inventor： Hidekazu Sato ,  Takahiro Sato ,  Hitoshi Kudo ,  Takashi Endo ,  Yusuke Nagai ,  Tatsuro Suzuki ,  Hiroko Korikawa ,  Kenji Komorita

IPC: H01F17/00 ,  H01F27/28 ,  H01F5/00 ,  H01F27/29 ,  H01F17/04 ,  H01F41/04

CPC classification number: H01F17/0013 ,  H01F5/003 ,  H01F17/04 ,  H01F27/2804 ,  H01F27/292 ,  H01F41/046

Abstract: A multilayer coil component includes an element body having a multilayer structure including a first element body portion formed of a ferrite element body material, and a second element body portion laminated on the first element body portion and formed of a ferrite element body material having a composition different from the ferrite element body material forming the first element body portion, 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 the multilayer coil when viewed from the lamination direction. In the multilayer coil component, the stress alleviation portion is provided in the inner region of the multilayer coil in which a stress tends to be concentrated to alleviate the stress in the inner region of the multilayer coil, and thereby occurrence of cracking in the element body can be suppressed.

公开(公告)号：US11302466B2

公开(公告)日：2022-04-12

申请号：US16199047

申请日：2018-11-23

Applicant: TDK CORPORATION

Inventor： Takashi Suzuki ,  Hidekazu Sato ,  Yusuke Nagai ,  Kouichi Kakuda ,  Kunihiko Kawasaki ,  Shinichi Kondo ,  Yuya Ishima ,  Shinichi Sato ,  Masaki Takahashi ,  Takashi Endo

IPC: H01F1/147 ,  H01F1/33 ,  H01F27/28 ,  H01F17/04 ,  H01F17/00 ,  H01F1/24 ,  H01F1/26 ,  H01F27/29 ,  H01F27/255

Abstract: A multilayer coil electronic component having improved inductance L, Q, and strength, and which has an element in which a coil conductor and a magnetic element body are stacked. The magnetic element body includes soft magnetic metal particles and a resin. The resin fills a space between the soft magnetic metal particles. Each of soft magnetic metal particles has a soft magnetic metal particle core and an oxide film covering the soft magnetic metal particle core. A layer of the oxide film contacting the soft magnetic metal particle core is made of an oxide including Si.

公开(公告)号：US12300409B2

公开(公告)日：2025-05-13

申请号：US17571640

申请日：2022-01-10

Applicant: TDK CORPORATION

Inventor： Shinichi Kondo ,  Takashi Inagaki ,  Ryuichi Wada ,  Yusuke Nagai ,  Takashi Suzuki

IPC: H01F1/147 ,  C08G59/38 ,  C08K9/02 ,  C22C38/02 ,  H01F27/255 ,  H01F41/02 ,  H01F41/04

Abstract: A multilayer coil device includes an element formed by laminating a coil conductor and a magnetic element body. The magnetic element body includes soft magnetic particles and an epoxy resin. The soft magnetic particles include soft magnetic metal particles. The epoxy resin has an epoxy value of 150 or less. The epoxy resin is filled in gap spaces between the soft magnetic particles.

公开(公告)号：US12040111B2

公开(公告)日：2024-07-16

申请号：US17486258

申请日：2021-09-27

Applicant: TDK CORPORATION

Inventor： Yusuke Nagai ,  Takashi Suzuki ,  Kazuhiro Ebina ,  Kouichi Kakuda ,  Kunihiko Kawasaki ,  Shinichi Kondo ,  Shinichi Sato ,  Seiichi Nakagawa ,  Mitsuharu Koike ,  Kazuhiro Miura

IPC: H01F1/28 ,  H01F5/00

CPC classification number: H01F1/28 ,  H01F5/003

Abstract: A multilayer coil component includes an element body containing a plurality of metal magnetic particles and a resin existing between the plurality of metal magnetic particles and a coil disposed in the element body and configured to include a plurality of electrically interconnected coil conductors. At least one of the plurality of coil conductors has a spiral shape and has conductor portions adjacent to each other when viewed from a direction along a coil axis of the coil. The conductor portion includes a straight conductor portion extending in a straight line and a connecting conductor portion connecting the straight conductor portion and constituting a corner portion of the coil conductor. The metal magnetic particles between the connecting conductor portions adjacent to each other are lower in density than the metal magnetic particles between the straight conductor portions adjacent to each other.

公开(公告)号：US11710593B2

公开(公告)日：2023-07-25

申请号：US16817046

申请日：2020-03-12

Applicant: TDK CORPORATION

Inventor： Shinichi Sato ,  Takahiro Sato ,  Yusuke Nagai ,  Mitsuharu Koike ,  Kazuhiro Miura ,  Seiichi Nakagawa ,  Shinichi Kondo ,  Takashi Suzuki

IPC: H01F27/28 ,  H01F17/00 ,  H01F1/24

CPC classification number: H01F17/0013 ,  H01F1/24 ,  H01F2017/0066

Abstract: A multilayer coil component includes an element body including a plurality of metal magnetic particles, and a plurality of coil conductors. The plurality of coil conductors is disposed in the element body. The plurality of coil conductors is separated from each other in a predetermined direction and electrically connected to each other. The plurality of coil conductors includes one pair of side surfaces opposing each other in the predetermined direction. Surface roughness of the one pair of side surfaces is less than 40% of an average particle size of the plurality of metal magnetic particles.

公开(公告)号：US11605483B2

公开(公告)日：2023-03-14

申请号：US17408155

申请日：2021-08-20

Applicant: TDK CORPORATION

Inventor： Ryuichi Wada ,  Takashi Suzuki ,  Yusuke Nagai ,  Kaori Sasaki ,  Tatsuro Suzuki

IPC: H01F1/22

Abstract: A composite magnetic body includes soft magnetic metal particles and non-magnetic ceramic particles each having a particle size (D50) smaller than that of the soft magnetic metal particles.