Patents by Inventor Yasuhide Yamashita

Yasuhide Yamashita 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).

  • Patent number: 11783988
    Abstract: A method of manufacturing an inductor element includes preparing an insert member including a winding portion where a conductor is wound in a coil shape. A plurality of preliminary green compacts is obtained by conducting a preliminary compression molding of a granule containing a magnetic powder and a resin at a pressure of 2.5×102 to 1×103 MPa. The insert member and the plurality of preliminary green compacts are integrated so that a joint interface of the plurality of preliminary green compacts is formed intermittently.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: October 10, 2023
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Katsushi Yasuhara, Chiomi Sato
  • Patent number: 11651880
    Abstract: A composite particle includes a large particle and binder particles. The large particle has a particle size of 10 ?m to 50 ?m. The binder particles are attached on the large particle and each have a particle size smaller than that of the large particle.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: May 16, 2023
    Assignee: TDK CORPORATION
    Inventor: Yasuhide Yamashita
  • Patent number: 11605490
    Abstract: The present invention is an inductor element having a conductor wound in a coil form, and a core part surrounding the coil and including a magnetic powder and a resin. The core part includes a top board part and a bottom board part respectively covering both ends of the coil, and an outer circumference part positioned at an outer circumference side of the coil, and a resin content of the outer circumference part is larger than a resin content of the top board part and also larger than a resin content of the bottom board part.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: March 14, 2023
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Chiomi Sato
  • Publication number: 20220311007
    Abstract: A positive electrode for a lithium ion secondary battery includes a current collector and a positive electrode active material layer in contact with at least one surface of the current collector, wherein the positive electrode active material layer contains a plurality of positive electrode active materials and a plurality of fibrous carbons, the positive electrode active material layer has a plurality of pores therein, at least a part of the plurality of fibrous carbons is intertwined with each other to form a carbon network, and the carbon network is formed on a surface facing one of the plurality of pores.
    Type: Application
    Filed: March 21, 2022
    Publication date: September 29, 2022
    Inventors: Hiroki KARISYUKU, Takashi MORI, Yasuhide YAMASHITA, Kotaro TERAO
  • Patent number: 11401208
    Abstract: A substrate includes a fabric-like member. First inorganic fillers exist on a surface of the fabric-like member.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: August 2, 2022
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Masaaki Yamashita
  • Publication number: 20210391112
    Abstract: An electronic component having excellent DC superimposition characteristic and initial magnetic permeability, a core used for the electronic component, and a element body constituting the core are provided. The element body has magnetic large particles and at least one spacer region, wherein one or more small particles having an average particle size smaller than that of the magnetic large particles exist as spacers to form the spacer region between the large particles in a field of view within a predetermined range where 10 or more and 40 or less of the large particles are observable in a cross section of the element body.
    Type: Application
    Filed: April 28, 2021
    Publication date: December 16, 2021
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Kotaro TERAO, Shinsuke HASHIMOTO
  • Publication number: 20210335526
    Abstract: A core can be used for an electronic component, and composite particles constitute the core. The composite particles contain magnetic large particles, small particles directly or indirectly attached to surfaces of the large particles and have an average particle size smaller than an average particle size of the large particles, and a mutual buffer film covering at least part of the surfaces of the large particles located between the small particles existing around the large particles. When the average particle size of the large particles is R, the average particle size of the small particles is r, and an average thickness of the mutual buffer film is t, (r/R) is 0.0012 or more and 0.025 or less, (t/r) is larger than 0 and 0.7 or less, and r is 12 nm or more and 100 nm or less.
    Type: Application
    Filed: April 28, 2021
    Publication date: October 28, 2021
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Kotaro TERAO, Shinsuke HASHIMOTO
  • Patent number: 11043320
    Abstract: A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: June 22, 2021
    Assignee: TDK CORPORATION
    Inventors: Masahiro Kamiya, Yasuhide Yamashita, Chiomi Sato, Yousuke Futamata, Ryoma Nakazawa, Takeshi Takahashi, Hiroyuki Ono
  • Patent number: 10984941
    Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. An inner-core central region is a region of the core portion within a distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. A top-plate central region is a region of the core portion within a distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction. S??S???2% is satisfied, where S? (%) and S? (%) are respectively an area ratio of the magnetic powder in the inner-core central region and the top-plate central region.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: April 20, 2021
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Katsushi Yasuhara, Chiomi Sato, Syota Goto
  • Patent number: 10886056
    Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. The wire-winding portion includes an inner circumferential surface. A winding-wire inner circumferential neighboring region is a region of the core portion within a distance from the inner circumferential surface toward a winding axis of the wire-winding portion. An inner-core central region is a region of the core portion within a distance from the winding axis center toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. S??S?1?5.0% is satisfied, where S?(%) and S?1(%) are respectively an area ratio of a magnetic powder in the inner-core central region and the winding-wire inner circumferential neighboring region.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: January 5, 2021
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Katsushi Yasuhara, Chiomi Sato
  • Publication number: 20200411226
    Abstract: A method of manufacturing an inductor element includes preparing an insert member including a winding portion where a conductor is wound in a coil shape. A plurality of preliminary green compacts is obtained by conducting a preliminary compression molding of a granule containing a magnetic powder and a resin at a pressure of 2.5×102 to 1×103 MPa. The insert member and the plurality of preliminary green compacts are integrated so that a joint interface of the plurality of preliminary green compacts is formed intermittently.
    Type: Application
    Filed: September 11, 2020
    Publication date: December 31, 2020
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Katsushi YASUHARA, Chiomi SATO
  • Publication number: 20200328021
    Abstract: The present invention is an inductor element having a conductor wound in a coil form, and a core part surrounding the coil and including a magnetic powder and a resin. The core part includes a top board part and a bottom board part respectively covering both ends of the coil, and an outer circumference part positioned at an outer circumference side of the coil, and a resin content of the outer circumference part is larger than a resin content of the top board part and also larger than a resin content of the bottom board part.
    Type: Application
    Filed: April 7, 2020
    Publication date: October 15, 2020
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Chiomi SATO
  • Patent number: 10804026
    Abstract: A method of manufacturing an inductor element includes preparing an insert member including a winding portion where a conductor is wound in a coil shape. A plurality of preliminary green compacts is obtained by conducting a preliminary compression molding of a granule containing a magnetic powder and a resin at a pressure of 2.5×102 to 1×103 MPa. The insert member and the plurality of preliminary green compacts are integrated so that a joint interface of the plurality of preliminary green compacts is formed intermittently.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: October 13, 2020
    Assignee: TDK CORPORATION
    Inventors: Yasuhide Yamashita, Katsushi Yasuhara, Chiomi Sato
  • Publication number: 20200317567
    Abstract: A substrate includes a fabric-like member. First inorganic fillers exist on a surface of the fabric-like member.
    Type: Application
    Filed: March 31, 2020
    Publication date: October 8, 2020
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Masaaki YAMASHITA
  • Publication number: 20200312502
    Abstract: A composite particle includes a large particle and binder particles. The large particle has a particle size of 10 ?m to 50 ?m. The binder particles are attached on the large particle and each have a particle size smaller than that of the large particle.
    Type: Application
    Filed: March 24, 2020
    Publication date: October 1, 2020
    Applicant: TDK CORPORATION
    Inventor: Yasuhide YAMASHITA
  • Publication number: 20180322998
    Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. An inner-core central region is a region of the core portion within a distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. A top-plate central region is a region of the core portion within a distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction. S??S???2% is satisfied, where S? (%) and s? (%) are respectively an area ratio of the magnetic powder in the inner-core central region and the top-plate central region.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 8, 2018
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Katsushi YASUHARA, Chiomi SATO, Syota GOTO
  • Publication number: 20180322997
    Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. The wire-winding portion includes an inner circumferential surface. A winding-wire inner circumferential neighboring region is a region of the core portion within a distance from the inner circumferential surface toward a winding axis of the wire-winding portion. An inner-core central region is a region of the core portion within a distance from the winding axis center toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. S??S?1?5.0% is satisfied, where S?(%) and S?1 (%) are respectively an area ratio of a magnetic powder in the inner-core central region and the winding-wire inner circumferential neighboring region.
    Type: Application
    Filed: May 1, 2018
    Publication date: November 8, 2018
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Katsushi YASUHARA, Chiomi SATO
  • Publication number: 20180294084
    Abstract: A dust core includes a metal magnetic material, a resin, and an insulation film. The insulation film contacts with a surface of the metal magnetic material and covers the metal magnetic material. The insulation film includes a first film and a second film. The first film contacts with the surface of the metal magnetic material. The second film contacts with a surface of the first film. A density of the first film is higher than a density of the second film.
    Type: Application
    Filed: March 8, 2018
    Publication date: October 11, 2018
    Applicant: TDK CORPORATION
    Inventors: Masahiro KAMIYA, Yasuhide YAMASHITA, Chiomi SATO, Yousuke FUTAMATA, Ryoma NAKAZAWA, Takeshi TAKAHASHI, Hiroyuki ONO
  • Publication number: 20180204661
    Abstract: A method of manufacturing an inductor element includes preparing an insert member including a winding portion where a conductor is wound in a coil shape. A plurality of preliminary green compacts is obtained by conducting a preliminary compression molding of a granule containing a magnetic powder and a resin at a pressure of 2.5×102 to 1×103 MPa. The insert member and the plurality of preliminary green compacts are integrated so that a joint interface of the plurality of preliminary green compacts is formed intermittently.
    Type: Application
    Filed: December 20, 2017
    Publication date: July 19, 2018
    Applicant: TDK CORPORATION
    Inventors: Yasuhide YAMASHITA, Katsushi YASUHARA, Chiomi SATO
  • Patent number: 9465230
    Abstract: A lens holding unit is held so that it can relatively move with respect to a base part to a direction vertical to an optical axis direction. The lens holding unit has a lens holder, a magnet part, and a spring. The lens holder has a first coil. The magnet part has a first magnet part which includes a first face facing to the first coil and a second magnet part which includes a second face vertical to the first face and constitutes a magnetic domain different from that of the first magnet part. These first magnet part and second magnet part are integrated.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: October 11, 2016
    Assignee: TDK Corporation
    Inventors: Masaru Uno, Kazutomo Imi, Noriyuki Kawano, Kazuhiko Inoue, Masashi Gotoh, Osamu Ohhata, Shintarou Koike, Yasuhide Yamashita