公开(公告)号：US12243675B2

公开(公告)日：2025-03-04

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: H01F5/00 ,  H01F17/00 ,  H01F17/04 ,  H01F27/29

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：US11410807B2

公开(公告)日：2022-08-09

申请号：US16750434

申请日：2020-01-23

Applicant: TDK CORPORATION

Inventor： Takeshi Shibayama ,  Takashi Suzuki ,  Yukio Takahashi

IPC: H01F1/34 ,  C04B35/26 ,  H01F17/00 ,  H01F27/255

Abstract: A ferrite composition includes main-phase particles, first sub-phase particles, second sub-phase particles, and a grain boundary. At least 10% or more of the main-phase particles contain a portion whose Zn concentrations monotonously decrease from a particle surface toward a particle central part along a length of 50 nm or more. The first sub-phase particles contain Zn2SiO4. The second sub-phase particles contain SiO2. A total area ratio of the first sub-phase particles and the second sub-phase particles is 30.5% or more.

公开(公告)号：US11367559B2

公开(公告)日：2022-06-21

申请号：US16227167

申请日：2018-12-20

Applicant: TDK CORPORATION

Inventor： Takahiro Sato ,  Hitoshi Kudo ,  Takashi Suzuki ,  Kouichi Kakuda ,  Tatsuro Suzuki ,  Hiroyuki Tanoue

IPC: H01F27/28 ,  H01F1/34 ,  H01F3/10 ,  H01F17/00 ,  H01F27/29

Abstract: The inventors have newly found that, even when a composition of a first element body portion and a composition of a second element body portion are different from each other, a high bonding strength at an interface between the first element body portion and the second element body portion can be obtained when both the first element body portion and the second element body portion contain Zn2SiO4 as a constituent component. That is, when the first element body portion and the second element body portion contain Zn2SiO4, a bonding strength at the interface is improved compared to a case in which the first element body portion and the second element body portion do not contain Zn2SiO4.

公开(公告)号：US10781132B2

公开(公告)日：2020-09-22

申请号：US15887281

申请日：2018-02-02

Applicant: TDK CORPORATION

Inventor： Shusaku Umemoto ,  Takashi Suzuki ,  Hidekazu Sato ,  Masaki Takahashi ,  Shinichi Kondo

IPC: H01F27/29 ,  C03C14/00 ,  C03C10/00 ,  C03C3/093 ,  C03C4/16 ,  H01F27/32

Abstract: Provided is a glass ceramics sintered body including a glass phase and a ceramics phase dispersed in the glass phase, in which the ceramics phase includes alumina grains and zirconia grains, the glass phase includes an MO—Al2O3—SiO2—B2O3 based glass, in which “M” is an alkaline earth metal, and an area ratio of the alumina grains is 0.05 to 12% and the area ratio of the zirconia grains is 0.05 to 6% on the cross section of the sintered body. According to the invention, a glass ceramics sintered body, capable of a low temperature sintering having a low dielectric constant and a sufficient strength, and a coil electronic component using thereof can be provided.

公开(公告)号：US09824804B2

公开(公告)日：2017-11-21

申请号：US15089992

申请日：2016-04-04

Applicant: TDK CORPORATION

Inventor： Hiroki Choto ,  Takeshi Shibayama ,  Takashi Suzuki ,  Shinichi Kondo ,  Yuya Oshima ,  Masaki Takahashi

IPC: H01F17/04 ,  H01F1/34 ,  H01F17/00 ,  H01F27/29

CPC classification number: H01F1/344 ,  H01F17/0013 ,  H01F17/04 ,  H01F27/292 ,  H01F2017/048

Abstract: Provided is a composite ferrite composition including a magnetic substance material and a nonmagnetic substance material. The magnetic substance material is Ni—Cu—Zn based ferrite. The nonmagnetic substance material comprises a low dielectric constant nonmagnetic substance material, which is shown by a general formula: a(bZnO.cCuO).SiO2 and satisfies a=1.5 to 2.4, b=0.85 to 0.98, c=0.02 to 0.15, and b+c=1.00 in said general formula, and a bismuth oxide. A mixing ratio of the magnetic substance material and the low dielectric constant nonmagnetic substance material is 80 wt %:20 wt % to 10 wt %:90 wt %.

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.

公开(公告)号：US11380476B2

公开(公告)日：2022-07-05

申请号：US16227112

申请日：2018-12-20

Applicant: TDK CORPORATION

Inventor： Takahiro Sato ,  Hitoshi Kudo ,  Takashi Suzuki ,  Kouichi Kakuda ,  Tatsuro Suzuki ,  Hiroyuki Tanoue

IPC: H01F27/29 ,  H01F27/28 ,  H01F17/00 ,  H01F41/04 ,  H01F1/34

Abstract: In a multilayer coil component, a ferrite element body includes a first element body portion and a second element body portion adjacent to each other in an axial direction of the multilayer coil, in which a dielectric constant of the second element body portion is lower than a dielectric constant of the first element body portion, and a magnetic permeability of the second element body portion is higher than a magnetic permeability of the first element body portion. The inventors newly found that the first element body portion and the second element body portion contribute to coil characteristics when a coil winding portion is provided to extend over the first element body portion and the second element body portion. In the multilayer coil component, desired coil characteristics can be obtained by adjusting proportions of the first element body portion and the second element body portion in the ferrite element body.