Patents by Inventor Yuma Koyama

Yuma Koyama 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: 10453600
    Abstract: Disclosed herein is a differential mode filter including a core including a winding core part, a first wire wound around the winding core part in a first winding direction, and a second wire wound around the winding core part in a second winding direction opposite to the first winding direction. The winding core part includes first and second winding surfaces. A first crossing angle between the first and second wires that cross a plurality of times on the first winding surface is smaller than that a second crossing angle between the first and second wires that cross a plurality of times on the second winding surface.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: October 22, 2019
    Assignee: TDK CORPORATION
    Inventors: Tsutomu Kobayashi, Toshio Tomonari, Emi Ito, Yuma Koyama
  • Patent number: 10374568
    Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: August 6, 2019
    Assignee: TDK CORPORATION
    Inventors: Tsutomu Kobayashi, Toshio Tomonari, Emi Ito, Yuma Koyama
  • Publication number: 20190089320
    Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.
    Type: Application
    Filed: November 15, 2018
    Publication date: March 21, 2019
    Applicant: TDK Corporation
    Inventors: Tsutomu KOBAYASHI, Toshio TOMONARI, Emi ITO, Yuma KOYAMA
  • Patent number: 10193516
    Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: January 29, 2019
    Assignee: TDK CORPORATION
    Inventors: Tsutomu Kobayashi, Toshio Tomonari, Emi Ito, Yuma Koyama
  • Publication number: 20170301455
    Abstract: Disclosed herein is a differential mode filter including a core including a winding core part, a first wire wound around the winding core part in a first winding direction, and a second wire wound around the winding core part in a second winding direction opposite to the first winding direction. The winding core part includes first and second winding surfaces. A first crossing angle between the first and second wires that cross a plurality of times on the first winding surface is smaller than that a second crossing angle between the first and second wires that cross a plurality of times on the second winding surface.
    Type: Application
    Filed: April 10, 2017
    Publication date: October 19, 2017
    Applicant: TDK Corporation
    Inventors: Tsutomu KOBAYASHI, Toshio Tomonari, Emi Ito, Yuma Koyama
  • Publication number: 20170288626
    Abstract: Disclosed herein is a common mode filter that includes first and second terminal electrodes provided on the first flange part, third and fourth terminal electrodes provided on the second flange part, a first wire wound around the winding core part and having one end connected to the first terminal electrode and other end connected to the third terminal electrode, and a second wire wound around the winding core part and having one end connected to the second terminal electrode and other end connected to the fourth terminal electrode. The winding core part includes a first winding region, a second winding region, and a third winding region positioned between the first and second winding regions in the axial direction. The first and second wires are bifilar-wound in the first and second winding regions and layer-wound in the third winding region.
    Type: Application
    Filed: March 16, 2017
    Publication date: October 5, 2017
    Applicant: TDK Corporation
    Inventors: Tsutomu KOBAYASHI, Toshio Tomonari, Emi Ito, Yuma Koyama