Patents by Inventor Yusuke Muta

Yusuke Muta 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).

  • Speaker magnetic circuit and speaker driver
    Patent number: 12432500
    Abstract: The speaker magnetic circuit includes a yoke cover that is formed from a tubular magnetic body with a diaphragm attachable to an end portion on an axial direction one-side, a magnet arranged at an inside of the yoke cover, a volume adjusting member that is formed from a tubular non-magnetic body, that is provided between the yoke cover and the magnet, and that is formed with a first groove extending in the axial direction, and a yoke base that is formed from a magnetic body, that is provided at an axial direction other-side of the magnet, and that is also formed with a second groove at a position corresponding to the first groove. The first groove and the second groove configure a duct portion that communicates a space inside the yoke cover at the axial direction one-side with a space at the axial direction other-side therein.
    Type: Grant
    Filed: February 8, 2022
    Date of Patent: September 30, 2025
    Assignee: FOSTER ELECTRIC COMPANY, LIMITED
    Inventors: Yusuke Muta, Haijiao Han
  • SPEAKER MAGNETIC CIRCUIT AND SPEAKER DRIVER
    Publication number: 20240056740
    Abstract: The speaker magnetic circuit includes a yoke cover that is formed from a tubular magnetic body with a diaphragm attachable to an end portion on an axial direction one-side, a magnet arranged at an inside of the yoke cover, a volume adjusting member that is formed from a tubular non-magnetic body, that is provided between the yoke cover and the magnet, and that is formed with a first groove extending in the axial direction, and a yoke base that is formed from a magnetic body, that is provided at an axial direction other-side of the magnet, and that is also formed with a second groove at a position corresponding to the first groove. The first groove and the second groove configure a duct portion that communicates a space inside the yoke cover at the axial direction one-side with a space at the axial direction other-side therein.
    Type: Application
    Filed: February 8, 2022
    Publication date: February 15, 2024
    Inventors: Yusuke Muta, Haijiao Han