Patents by Inventor Yasuhiro Koshimoto

Yasuhiro Koshimoto 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).

  • Electromagnetic noise absorbing material and electromagnetic noise filter
    Patent number: 5990417
    Abstract: Electromagnetic noise absorbing material and filter, which are small, light, and effective even with respect to unwanted electromagnetic waves of a few hundred MHz or more, are provided. A small and flexible electromagnetic noise filter cable and tape-shaped electromagnetic noise filter, as well as a manufacturing method and manufacturing apparatus therefor, are also provided. The electromagnetic noise absorbing material has a thickness or particle diameter of the alloy magnetic substance which is within a range of from 1/10 to 10 times the skin depth thereof, and thereby, a large eddy current loss can be generated, so that it is possible to manufacture electromagnetic noise filters having various shapes, which are small, light, and which realize a large electromagnetic noise suppression effect as a result of eddy current loss, and these possess a large relative magnetic permeability even at levels of a few hundred MHz or more.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: November 23, 1999
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masakatsu Senda, Toshinori Mori, Osamu Ishii, Yasuhiro Koshimoto, Tomoyuki Toshima
  • Magnetic sensor and magnetic field sensing method using said magnetic sensor based on impedance changes of a high frequency excited conductor
    Patent number: 5811971
    Abstract: In a magnetic field sensing method in accordance with the invention of the present application, a magnetic sensor comprising a conductor and at least one magnetic material provided on any of the surfaces of this conductor, is employed. This magnetic sensor is disposed in the vicinity of an external magnetic field which is to be sensed, and by means of supplying a high frequency current to this conductor, the impedance of the conductor changes in accordance with the external magnetic field, and based on this, the external magnetic field is sensed.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: September 22, 1998
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masakatsu Senda, Osamu Ishii, Yasuhiro Koshimoto, Tomoyuki Toshima
  • Magnetic head, magnetic recording method using the magnetic head, and magnetic field sensing method using the magnetic head based on impedance changes of a high frequency excited conductor
    Patent number: 5734267
    Abstract: In a magnetic field sensing method in accordance with the invention of the present application, a magnetic sensor comprising a conductor and at least one magnetic material provided on any of the surfaces of this conductor, is employed. This magnetic sensor is disposed in the vicinity of an external magnetic field which is to be sensed, and by means of supplying a high frequency current to this conductor, the impedance of the conductor changes in accordance with the external magnetic field, and based on this, the external magnetic field is sensed.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: March 31, 1998
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masakatsu Senda, Osamu Ishii, Yasuhiro Koshimoto, Tomoyuki Toshima
  • Magnetic sensor and magnetic field sensing method of using same based on impedance changes of a high frequency supplied conductor
    Patent number: 5705926
    Abstract: In a magnetic field sensing method in accordance with the invention of the present application, a magnetic sensor comprising a conductor and at least one magnetic material provided on any of the surfaces of this conductor, is employed. This magnetic sensor is disposed in the vicinity of an external magnetic field which is to be sensed, and by means of supplying a high frequency current to this conductor, the impedance of the conductor changes in accordance with the external magnetic field, and based on this, the external magnetic field is sensed.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: January 6, 1998
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Masakatsu Senda, Osamu Ishii, Yasuhiro Koshimoto, Tomoyuki Toshima