Patents by Inventor Shigeharu Nagai

Shigeharu Nagai 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).

  • Pressure-contact type rectifier with contact friction reducer
    Patent number: 7534979
    Abstract: An objective is to provide a pressure-contact type rectifier in which solder that increases the environmental load is not used, and neither burning nor breakage of a rectifying device occurs, even if temperature of the rectifying device increases due to current flowing or force towards outside the rectifying device is applied to a lead end, etc. By providing an electrically conductive friction reducer on at least one electrode face of the rectifying device, the temperature increase can be prevented, and the friction at the contact face can be reduced. Moreover, by providing a flexible portion on the lead end outside a cap, and fixing the flexible portion to the cap, the contact area between the lead and the rectifying device can be kept constant. As a result, a pressure-contact type rectifier in which neither burning nor breakage of the rectifying device occurs can be obtained.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: May 19, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shinichi Ito, Shigeki Maekawa, Hiroya Ikuta, Shigeharu Nagai, Toshiaki Kashihara, Shinji Iwamoto, Takahiro Sonoda
  • Pressure-contact type rectifier
    Publication number: 20070139979
    Abstract: An objective is to provide a pressure-contact type rectifier in which solder that increases the environmental load is not used, and neither burning nor breakage of a rectifying device occurs, even if temperature of the rectifying device increases due to current flowing or force towards outside the rectifying device is applied to a lead end, etc. By providing an electrically conductive friction reducer on at least one electrode face of the rectifying device, the temperature increase can be prevented, and the friction at the contact face can be reduced. Moreover, by providing a flexible portion on the lead end outside a cap, and fixing the flexible portion to the cap, the contact area between the lead and the rectifying device can be kept constant. As a result, a pressure-contact type rectifier in which neither burning nor breakage of the rectifying device occurs can be obtained.
    Type: Application
    Filed: May 14, 2004
    Publication date: June 21, 2007
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Shinichi Ito, Shigeki Maekawa, Hiroya Ikuta, Shigeharu Nagai, Toshiaki Kashihara, Shinji Iwamoto, Takahiro Sonoda