Patents by Inventor Kenichi Tohchi

Kenichi Tohchi 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).

  • Faraday rotator and optical device comprising the same, and antireflection film and optical device comprising the same
    Patent number: 6853473
    Abstract: The invention relates to an optical device for polarizing light by changing its Faraday rotation angle, such as optical attenuators, optical switches or polarization controllers; and its object is to provide such an optical device which can be driven even by small-sized and power-saving magnetic circuits and in which the insertion loss in the Faraday rotator may be reduced. The optical device comprises a Faraday rotator formed of a garnet single crystal, and a magnetic circuit applying an external magnetic field H that is smaller than the saturation magnetic field Hs of the Faraday rotator to the Faraday rotator.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: February 8, 2005
    Assignee: TDK Corporation
    Inventors: Atsushi Ohido, Kenichi Tohchi, Kazuhito Yamasawa, Shinichiro Kakei
  • Faraday rotator and optical device comprising the same, and antireflection film and optical device comprising the same
    Publication number: 20030137718
    Abstract: The invention relates to an optical device for polarizing light by changing its Faraday rotation angle, such as optical attenuators, optical switches or polarization controllers; and its object is to provide such an optical device which can be driven even by small-sized and power-saving magnetic circuits and in which the insertion loss in the Faraday rotator may be reduced. The optical device comprises a Faraday rotator formed of a garnet single crystal, and a magnetic circuit applying an external magnetic field H that is smaller than the saturation magnetic field Hs of the Faraday rotator to the Faraday rotator.
    Type: Application
    Filed: January 21, 2003
    Publication date: July 24, 2003
    Applicant: TDK CORPORATION
    Inventors: Atsushi Ohido, Kenichi Tohchi, Kazuhito Yamasawa, Shinichiro Kakei