公开(公告)号：US20220102039A1

公开(公告)日：2022-03-31

申请号：US17486640

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 ,  H01F27/28

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 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 plurality of metal magnetic particles contained in the element body include a plurality of metal magnetic particles having a particle diameter of ⅓ or more and ½ or less of a distance between the conductor portions adjacent to each other in the coil conductor. The metal magnetic particles having the particle diameter are arranged along a facing direction of the conductor portions between the conductor portions adjacent to each other in the coil conductor.

公开(公告)号：US20190096561A1

公开(公告)日：2019-03-28

申请号：US16136944

申请日：2018-09-20

Applicant: TDK CORPORATION

Inventor： Yusuke NAGAI ,  Takashi SUZUKI ,  Hidekazu SATO ,  Takashi ENDO ,  Kouichi KAKUDA ,  Kunihiko KAWASAKI ,  Shinichi KONDO ,  Yuya ISHIMA ,  Shinichi SATO ,  Masaki TAKAHASHI

IPC: H01F17/00 ,  H01F27/34 ,  H01F41/04 ,  H01F17/04

Abstract: In a stepwise structure formed in a multilayer coil component, a difference occurs in a shrinkage amount between a maximum film thickness portion in which the number of layers is large and a minimum film thickness portion in which the number of layers is small due to portions different in the number of layers of coil parts (that is, upper coil part, lower coil part, and connecting part) adjacent to each other like the maximum film thickness portion and the minimum film thickness portion, readily causing a crack by an inner stress due to the difference in the shrinkage amount. In a multilayer coil component according to the present disclosure, a stress relaxation part overlapping with a maximum film thickness portion whose shrinkage amount is large is provided to relax inner stress in a stepwise structure, resulting in prevention of a crack.

公开(公告)号：US20180233262A1

公开(公告)日：2018-08-16

申请号：US15895567

申请日：2018-02-13

Applicant: TDK CORPORATION

Inventor： Yuusuke NAGAI ,  Takashi SUZUKI ,  Kouichi KAKUDA ,  Kunihiko KAWASAKI ,  Shinichi KONDO ,  Yuya ISHIMA ,  Shinichi SATO ,  Masaki TAKAHASHI ,  Takashi ENDO

IPC: H01F17/00 ,  H01F27/29

Abstract: In a multilayer coil component, an end of a lower coil layer and an end of a connecting part are directly overlapped, and the end of the lower coil layer includes a contact edge positioned on a side of the connecting part and being in contact with the connecting part and a non-contact edge positioned on a side opposite to the connecting part and not being in contact with the connecting part. Then, the contact edge and the non-contact edge are not overlapped when viewed from a laminated direction. Consequently, a propagation distance of a crack becomes longer as compared with the case where an end face is parallel to the laminated direction, effectively suppressing advance of the crack. Suppressed advance of a crack in this manner makes the multilayer coil component provide a high component strength as a whole.

公开(公告)号：US20170103845A1

公开(公告)日：2017-04-13

申请号：US15275832

申请日：2016-09-26

Applicant: TDK CORPORATION

Inventor： Yuusuke NAGAI ,  Kunihiko KAWASAKI

IPC: H01F27/28

CPC classification number: H01F27/2804 ,  H01F3/14 ,  H01F5/00 ,  H01F17/0013 ,  H01F17/04 ,  H01F27/255 ,  H01F2027/2809

Abstract: Each of internal conductors includes an annular portion with two end portions and an extension portion extending along the one end portion from the other end portion and separated from the one end portion. An edge of the one end portion and an edge of the other end portion oppose each other. The internal conductors include two first internal conductors and a second internal conductor located between the first internal conductors in a first direction. The one end portion of at least one first internal conductor includes a first portion overlapping the edges of the two end portions of the second internal conductor and a second portion overlapping a region between the edges of the two end portions of the second internal conductor, when viewed from the first direction. The second portion is recessed at a side opposite to the region, as compared with the first portion.

公开(公告)号：US20170103842A1

公开(公告)日：2017-04-13

申请号：US15276170

申请日：2016-09-26

Applicant: TDK CORPORATION

Inventor： Yuusuke NAGAI ,  Kunihiko KAWASAKI ,  Yoshimitsu SATOH

IPC: H01F27/245 ,  H01F27/255 ,  H01F27/28

CPC classification number: H01F27/245 ,  H01F3/14 ,  H01F5/00 ,  H01F17/0013 ,  H01F27/255 ,  H01F27/2804 ,  H01F2027/2809

Abstract: A coil includes a plurality of internal conductors that are electrically connected to each other and are disposed in an element body having magnetism. The plurality of internal conductors includes conductor portions that are separated from each other in a first direction and overlap each other when viewed from the first direction. At least one low-permeability layer is disposed along the conductor portions between the internal conductors adjacent to each other in the first direction. Permeability of the low-permeability layer is lower than permeability of the element body. The low-permeability layer includes a first portion contacting the internal conductors and at least one second portion separated from the internal conductors in the first direction, between the internal conductors adjacent to each other. The element body includes first element body regions that are interposed between the second portion and the internal conductors.

公开(公告)号：US20220108836A1

公开(公告)日：2022-04-07

申请号：US17490893

申请日：2021-09-30

Applicant: TDK CORPORATION

Inventor： Yusuke NAGAI ,  Takashi SUZUKI ,  Kazuhiro EBINA ,  Kunihiko KAWASAKI ,  Shinichi KONDO ,  Keito YASUDA ,  Ryuichi WADA ,  Makoto MORITA ,  Takashi KUDO ,  Kyohei TONOYAMA

IPC: H01F27/29 ,  H01F17/00 ,  H01F17/04

Abstract: In a multilayer coil component, a part filled with a resin and a void part not filled with the resin exist between a plurality of metal magnetic particles in an element body, one main surface of the element body is a mounting surface with respect to an external electronic component, and the edge of an external electrode is positioned on the mounting surface. In the element body, a high void region where the porosity caused by the void part is higher than the porosity of the other part in the element body extends from the edge of the external electrode on the mounting surface toward an end surface of the element body.

公开(公告)号：US20220102038A1

公开(公告)日：2022-03-31

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

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：US20180218829A1

公开(公告)日：2018-08-02

申请号：US15419522

申请日：2017-01-30

Applicant: TDK CORPORATION

Inventor： Takashi ENDO ,  Kenji KOMORITA ,  Kunihiko KAWASAKI ,  Hidekazu SATO ,  Takashi SUZUKI

IPC: H01F27/28

CPC classification number: H01F17/0033 ,  H01F17/0013 ,  H01F2017/0066

Abstract: A multilayer coil component includes an element body, a coil including a plurality of internal conductors, and a plurality of stress-relaxation spaces. The plurality of internal conductors are separated from each other in a first direction in the element body. Each stress-relaxation space is in contact with a surface of the corresponding internal conductor and powders exist in each stress-relaxation space. The element body includes element body regions located between the internal conductors adjacent to each other in the first direction. Each stress-relaxation space includes a first boundary surface with each internal conductor and a second boundary surface with each element body region. The first boundary surface and the second boundary surface oppose each other in the first direction. A distance between the first boundary surface and the second boundary surface is smaller than a thickness of each element body region in the first direction.

公开(公告)号：US20170372829A1

公开(公告)日：2017-12-28

申请号：US15617401

申请日：2017-06-08

Applicant: TDK CORPORATION

Inventor： Yuusuke NAGAI ,  Takashi SUZUKI ,  Kouichi KAKUDA ,  Kunihiko KAWASAKI ,  Shinichi KONDO ,  Yuya ISHIMA ,  Shinichi SATO ,  Masaki TAKAHASHI ,  Takashi ENDO

IPC: H01F27/255 ,  H01F27/28

CPC classification number: H01F27/255 ,  H01F5/00 ,  H01F17/0013 ,  H01F17/0033

Abstract: A multilayer coil component includes an element body including soft magnetic metal powders and a coil disposed in the element body. The coil includes a plurality of internal conductors electrically connected to each other. The plurality of internal conductors are separated from each other in a first direction and are adjacent to each other in the first direction. An average particle diameter of the soft magnetic metal powders located at an inner side of the coil when viewing from the first direction is larger than an average particle diameter of the soft magnetic metal powders located between the internal conductors adjacent to each other in the first direction.

公开(公告)号：US20230230737A1

公开(公告)日：2023-07-20

申请号：US18151070

申请日：2023-01-06

Applicant: TDK CORPORATION

Inventor： Yusuke NAGAI ,  Kazuhiro EBINA ,  Kunihiko KAWASAKI ,  Shinichi KONDO ,  Kouichi KAKUDA ,  Shinichi SATO ,  Keito YASUDA

IPC: H01F5/00 ,  H01F1/20

CPC classification number: H01F5/003 ,  H01F1/20

Abstract: A multilayer coil component includes: an element body including a plurality of magnetic layers that includes soft magnetic metal particles and is laminated in a first direction; and a coil disposed in the element body. The coil includes a plurality of coil conductors electrically connected to each other. The plurality of magnetic layers includes a first magnetic layer and a second magnetic layer laminated between two coil conductors adjacent to each other in the first direction. An average particle diameter of soft magnetic metal particles included in the second magnetic layer is larger than an average particle diameter of soft magnetic metal particles included in the first magnetic layer.