Patents by Inventor Rintaro Kohara

Rintaro Kohara 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).

  • Loudspeaker
    Patent number: 5511131
    Abstract: A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directly coupled at inner peripheral edge substantially to the center of outer periphery of the voice coils. Driving force is transmitted highly efficiently from the voice coils to the diaphragm, and the loudspeaker can be sufficiently minimized in the thickness and weight.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: April 23, 1996
    Assignee: Foster Electric Co., Ltd.
    Inventors: Rintaro Kohara, Takeshi Yoshimura, Hidetoshi Shirakawa
  • Loudspeaker
    Patent number: 5371806
    Abstract: A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directly coupled at inner peripheral edge substantially to the center of outer periphery of the voice coils. Driving force is transmitted highly efficiently from the voice coils to the diaphragm, and the loudspeaker can be sufficiently minimized in the thickness and weight.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: December 6, 1994
    Assignee: Foster Electric Co., Ltd.
    Inventors: Rintaro Kohara, Takeshi Yoshimura, Hidetoshi Shirakawa