Patents by Inventor Imaizumi Hiraku

Imaizumi Hiraku 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).

  • Magnetic tile sensor with a non-magnetic case having a flange and a cover cold welded thereon
    Patent number: 4910459
    Abstract: A magnetic tile sensor has a permanent magnet having a surface coated with a magnetic fluid and housed in a hollow portion of a nonmagnetic case, and a magnetic sensing element arranged outside the bottom portion of the case. When the case is tilted or is abruptly moved, the permanent magnet in the case is relatively displaced. The magnetic sensing element detects this displacement. Since the nonmagnetic case is sealed by a cold welding method, workability and reliability can be increased. In addition, a cap having a predetermined weight covers the permanent magnet so that a response characteristic is improved.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: March 20, 1990
    Assignee: TDK Corporation
    Inventors: Yoshimoto Odagawa, Yasushi Yanagisawa, Takashi Shioura, Imaizumi Hiraku, Akira Morita
  • Structure of a transformer
    Patent number: 4394636
    Abstract: A transformer having a main winding and a control winding has a pair of E-shaped cores (10, 11), and an I-shaped third core (13) positioned on one E-shaped core (10). A small groove (14) is provided on the base plate (10c) of the first E-shaped core (10). A control winding (12) is wound on the I-shaped core (13) so that the winding (2) rests in the groove 14. Those cores (10, 11, 13) are made of ferrite material. Thus, both the main winding and the control winding can be produced using a winding machine.
    Type: Grant
    Filed: May 1, 1981
    Date of Patent: July 19, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Imaizumi Hiraku, Mitsui Tadashi