Patents by Inventor Kouichi Kakuda

Kouichi Kakuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220336128
    Abstract: A soft magnetic metal powder or the like from which a soft magnetic metal fired body can be provided has a high magnetic permeability ? and a specific resistance ? and is contained in a coil-type electronic component having sufficiently high inductance L and Q value and unlikely to be plating-extended and short-circuited. A soft magnetic metal powder contains soft magnetic metal particles containing at least Fe and Ni. Said soft magnetic metal powder further contains P, Si, Cr and/or M. M is at least one selected from among B, Co, Mn, Ti, Zr, Hf, Nb, Ta, Mo, Mg, Ca, Sr, Ba, Zn, Al, and rare earth elements. The content of each element is within a predetermined range.
    Type: Application
    Filed: September 25, 2020
    Publication date: October 20, 2022
    Applicant: TDK CORPORATION
    Inventors: Takashi SUZUKI, Yu SAKURAI, Hideyuki ITOH, Kouichi KAKUDA, Ryuichi WADA, Nami ENOMOTO, Yusuke NAGAI, Kunihiko KAWASAKI, Shinichi KONDO, Yuya ISHIMA
  • Publication number: 20220336140
    Abstract: A coil-type electronic component comprises an element including a magnetic element body and a coil conductor. A portion of the magnetic element body in between layers of the coil conductor adjacent to each other in an axis direction of the coil conductor includes first soft magnetic metal particles. A portion of the magnetic element body on an outer side along the axis includes second soft magnetic metal particles. The first soft magnetic metal particles have a saturation magnetization (Ms) higher than that of the second soft magnetic metal particles.
    Type: Application
    Filed: April 11, 2022
    Publication date: October 20, 2022
    Applicant: TDK CORPORATION
    Inventors: Yu SAKURAI, Takashi SUZUKI, Hideyuki ITOH, Kouichi KAKUDA, Ryuichi WADA, Nami ENOMOTO, Yusuke NAGAI, Kunihiko KAWASAKI, Shinichi KONDO, Yuya ISHIMA
  • Publication number: 20220310316
    Abstract: In the multi-layer coil component, the hole portion is provided in the vicinity of the side surface of the element body, and the distance from the tip position of the external electrode to the hole portion is shorter than the distance from the tip position of the external electrode to the coil. Therefore, when a crack is generated starting from the tip position of the external electrode on the mounting surface, the crack progress toward the hole portion located at a distance closer than the coil. Therefore, in the multi-layer coil component, splitting of the coil due to the crack can be prevented.
    Type: Application
    Filed: March 28, 2022
    Publication date: September 29, 2022
    Applicant: TDK CORPORATION
    Inventors: Yuya OSHIMA, Kenji KOMORITA, Masayuki SUZUKI, Yuudai KATOU, Takeru SASAKI, Shigeshi OSAWA, Takehiro ISHII, Kouichi KAKUDA, Yukio TAKAHASHI, Tsubasa OZAWA, Makoto YOSHINO
  • Publication number: 20220306541
    Abstract: A ferrite composition comprises a main component and a subcomponent. The main component includes 32.0 to 46.4 mol % of iron oxide in terms of Fe2O3, 4.4 to 14.0 mol % of copper oxide in terms of CuO, and 8.4 to 56.9 mol % of zinc oxide in terms of ZnO. The subcomponent includes 0.53 to 11.00 parts by weight of a silicon compound in terms of SiO2, 0.1 to 12.8 parts by weight of a tin compound in terms of SnO2, and 0.5 to 7.0 parts by weight of a bismuth compound in terms of Bi2O3, with respect to 100 parts by weight of the main component.
    Type: Application
    Filed: March 21, 2022
    Publication date: September 29, 2022
    Applicant: TDK CORPORATION
    Inventors: Kouichi KAKUDA, Takashi SUZUKI, Yukio TAKAHASHI, Kunihiko KAWASAKI, Hiroyuki TANOUE, Takehiro ISHII, Takuya NIIBORI, Takahiro SATO, Akihiko OIDE, Yasuhiro ITO, Takashi ENDO, Kunio ODA
  • Publication number: 20220277879
    Abstract: In a multilayer coil component, first and second conductor patterns respectively have parallel parts that overlap in a lamination direction and non-parallel parts that do not overlap. The parallel parts of the first and second conductor patterns of one set are interconnected by a first through hole. The non-parallel parts of the first and second conductor patterns of sets adjacent to each other in the lamination direction are interconnected by a second through hole.
    Type: Application
    Filed: February 7, 2022
    Publication date: September 1, 2022
    Applicant: TDK CORPORATION
    Inventors: Yusuke NAGAI, Hidekazu SATO, Kazuhiro EBINA, Kunihiko KAWASAKI, Takahiro SATO, Kouichi KAKUDA, Yuya ISHIMA, Shinichi KONDO, Shinichi SATO, Masaki TAKAHASHI
  • Patent number: 11380476
    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.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: July 5, 2022
    Assignee: TDK CORPORATION
    Inventors: Takahiro Sato, Hitoshi Kudo, Takashi Suzuki, Kouichi Kakuda, Tatsuro Suzuki, Hiroyuki Tanoue
  • Patent number: 11367559
    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.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: June 21, 2022
    Assignee: TDK CORPORATION
    Inventors: Takahiro Sato, Hitoshi Kudo, Takashi Suzuki, Kouichi Kakuda, Tatsuro Suzuki, Hiroyuki Tanoue
  • Publication number: 20220181073
    Abstract: In a multilayer coil component, a coil is configured by electrically connecting coil conductors respectively provided in magnetic body layers constituting an element body and metal magnetic particles have a normal particle having an ellipsoidal shape and flat particles having an ellipsoidal shape flatter in a thickness direction than the normal particle. A plurality of the normal particles and at least one of the flat particles disposed such that a surface (reference surface) including a major axis direction orthogonal to the thickness direction and a minor axis direction is along the forming surface of the coil conductor in the magnetic body layer are arranged in the lamination direction of the magnetic body layers between the coil conductors.
    Type: Application
    Filed: November 10, 2021
    Publication date: June 9, 2022
    Applicant: TDK CORPORATION
    Inventors: Yusuke NAGAI, Kazuhiro EBINA, Kouichi KAKUDA, Kunihiko KAWASAKI, Shinichi KONDO, Yuya ISHIMA, Masaki TAKAHASHI, Takahiro SATO, Keito YASUDA, Shingo HATTORI
  • Patent number: 11302466
    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.
    Type: Grant
    Filed: November 23, 2018
    Date of Patent: April 12, 2022
    Assignee: TDK CORPORATION
    Inventors: Takashi Suzuki, Hidekazu Sato, Yusuke Nagai, Kouichi Kakuda, Kunihiko Kawasaki, Shinichi Kondo, Yuya Ishima, Shinichi Sato, Masaki Takahashi, Takashi Endo
  • Publication number: 20220102038
    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.
    Type: Application
    Filed: September 27, 2021
    Publication date: March 31, 2022
    Applicant: TDK CORPORATION
    Inventors: Yusuke NAGAI, Takashi SUZUKI, Kazuhiro EBINA, Kouichi KAKUDA, Kunihiko KAWASAKI, Shinichi KONDO, Shinichi SATO, Seiichi NAKAGAWA, Mitsuharu KOIKE, Kazuhiro MIURA
  • Publication number: 20220102039
    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 ? 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.
    Type: Application
    Filed: September 27, 2021
    Publication date: March 31, 2022
    Applicant: TDK CORPORATION
    Inventors: Yusuke NAGAI, Takashi SUZUKI, Kazuhiro EBINA, Kouichi KAKUDA, Kunihiko KAWASAKI, Shinichi KONDO, Shinichi SATO, Seiichi NAKAGAWA, Mitsuharu KOIKE, Kazuhiro MIURA
  • Patent number: 11211188
    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.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: December 28, 2021
    Assignee: TDK CORPORATION
    Inventors: Yusuke Nagai, Takashi Suzuki, Hidekazu Sato, Takashi Endo, Kouichi Kakuda, Kunihiko Kawasaki, Shinichi Kondo, Yuya Ishima, Shinichi Sato, Masaki Takahashi
  • Patent number: 10894745
    Abstract: A ferrite composition includes a main component and an accessory component. The main component includes 43.0 to 51.0 mol % of iron oxide in terms of Fe2O3, 5.0 to 15.0 mol % of copper oxide in terms of CuO, 1.0 to 24.9 mol % of zinc oxide in terms of ZnO, and a remaining part of nickel oxide. The accessory component includes 0.2 to 3.0 pts. wt. of silicon compound in terms of SiO2, 3.0 to 8.0 pts. wt. of cobalt compound in terms of Co3O4 (excluding 3.0 pts. wt.), and 0.2 to 8.0 pts. wt. of bismuth compound in terms of Bi2O3 with respect to 100 pts. wt. of the main component.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: January 19, 2021
    Assignee: TDK CORPORATION
    Inventors: Kouichi Kakuda, Ryuichi Wada, Yukio Takahashi, Hiroyuki Tanoue, Tatsuro Suzuki, Takahiro Sato, Takashi Suzuki
  • Patent number: 10818422
    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.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: October 27, 2020
    Assignee: TDK CORPORATION
    Inventors: Yuusuke Nagai, Takashi Suzuki, Kouichi Kakuda, Kunihiko Kawasaki, Shinichi Kondo, Yuya Ishima, Shinichi Sato, Masaki Takahashi, Takashi Endo
  • Patent number: 10607756
    Abstract: A soft magnetic metal powder includes a plurality of soft magnetic metal grains composed of an Fe—Si based alloy. A content of P in the Fe—Si based alloy is 110 to 650 ppm provided that a total content of Fe and Si is 100 mass %. A soft magnetic metal fired body includes soft magnetic metal fired grains composed of an Fe—Si based alloy. A content of P in the Fe—Si based alloy is 110 to 650 ppm provided that a total content of Fe and Si is 100 mass %.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: March 31, 2020
    Assignee: TDK CORPORATION
    Inventors: Takashi Suzuki, Hidekazu Sato, Yuusuke Nagai, Kouichi Kakuda, Kunihiko Kawasaki, Shinichi Kondo, Yuya Ishima, Shinichi Sato, Masaki Takahashi, Takashi Endo
  • Patent number: 10388448
    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.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: August 20, 2019
    Assignee: TDK CORPORATION
    Inventors: Yuusuke Nagai, Takashi Suzuki, Kouichi Kakuda, Kunihiko Kawasaki, Shinichi Kondo, Yuya Ishima, Shinichi Sato, Masaki Takahashi, Takashi Endo
  • Publication number: 20190198210
    Abstract: The present invention provides a multilayer coil electronic component having improved inductance L, Q, and strength. The multilayer coil electronic component 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.
    Type: Application
    Filed: November 23, 2018
    Publication date: June 27, 2019
    Applicant: TDK CORPORATION
    Inventors: Takashi SUZUKI, Hidekazu SATO, Yusuke NAGAI, Kouichi KAKUDA, Kunihiko KAWASAKI, Shinichi KONDO, Yuya ISHIMA, Shinichi SATO, Masaki TAKAHASHI, Takashi ENDO
  • Publication number: 20190198232
    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.
    Type: Application
    Filed: December 20, 2018
    Publication date: June 27, 2019
    Applicant: TDK CORPORATION
    Inventors: Takahiro SATO, Hitoshi KUDO, Takashi SUZUKI, Kouichi KAKUDA, Tatsuro SUZUKI, Hiroyuki TANOUE
  • Publication number: 20190198227
    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.
    Type: Application
    Filed: December 20, 2018
    Publication date: June 27, 2019
    Applicant: TDK CORPORATION
    Inventors: Takahiro SATO, Hitoshi KUDO, Takashi SUZUKI, Kouichi KAKUDA, Tatsuro SUZUKI, Hiroyuki TANOUE
  • Publication number: 20190096561
    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.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Applicant: TDK CORPORATION
    Inventors: Yusuke NAGAI, Takashi SUZUKI, Hidekazu SATO, Takashi ENDO, Kouichi KAKUDA, Kunihiko KAWASAKI, Shinichi KONDO, Yuya ISHIMA, Shinichi SATO, Masaki TAKAHASHI