Patents by Inventor Zenkichi Nakamura

Zenkichi Nakamura 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: 5982176
    Abstract: A geomagnetic direction sensor has a plurality of magnetic cores for converging terrestrial magnetism arranged circumferentially with pre-set gaps, and magneto-resistive effect devices in the gaps so as to lie substantially at right angles to the direction of the magnetic field in the gaps. The geomagnetic direction sensor has at least a pair of magneto-resistive effect devices lying substantially at right angles to each other. The magnetic core is formed of a magnetic material having soft magnetic properties. The current is supplied to the excitation coils placed around the magnetic core for applying a bias magnetic field to the magneto-resistive effect devices. Another set of magneto-resistive effect devices are connected in series with the magneto-resistive effect devices arranged within the gap so as to be substantially parallel to the direction of the magnetic field.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: November 9, 1999
    Assignee: Sony Corporation
    Inventors: Yoshihisa Kawamura, Kazuo Kurihara, Zenkichi Nakamura, Kietsu Iwabuchi, Toshio Aizawa, Hideo Suyama