Patents by Inventor Chiharu Nishida

Chiharu Nishida 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).

  • Magneto-optical device
    Patent number: 7280264
    Abstract: It is possible to reduce the size of a magneto-optical device, increase the speed of optical control, simplify power supply structure and its control, and maintain a Faraday rotation angle in an arbitrary state even after shut-off of the excitation current. The magneto-optical device includes a magnetic yoke (10) made of a high-permeability magnetic material, the magnetic yoke including a tabular portion (16) and four pillar portions (18) protruding from one side of the tabular portion (16), a coil (12) wound on each of the pillar portions, and a magneto-optical element (14) arranged in an open-magnetic-circuit region surrounded by the end portions of the four pillar portions. A magnetic field obtained by a coil is applied to the magneto-optical element.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: October 9, 2007
    Assignee: FDK Corporation
    Inventors: Yuji Goto, Mikio Kitaoka, Hiromitsu Umezawa, Tsugio Tokumasu, Toshihiko Watanabe, Akitoshi Mesaki, Takashi Kato, Masaharu Hoshikawa, Chiharu Nishida
  • Magneto-optical device
    Publication number: 20070002425
    Abstract: It is possible to reduce the size of a magneto-optical device, increase the speed of optical control, simplify power supply structure and its control, and maintain a Faraday rotation angle in an arbitrary state even after shut-off of the excitation current. The magneto-optical device includes a magnetic yoke (10) made of a high-permeability magnetic material, the magnetic yoke including a tabular portion (16) and four pillar portions (18) protruding from one side of the tabular portion (16), a coil (12) wound on each of the pillar portions, and a magneto-optical element (14) arranged in an open-magnetic-circuit region surrounded by the end portions of the four pillar portions. A magnetic field obtained by a coil is applied to the magneto-optical element.
    Type: Application
    Filed: August 26, 2004
    Publication date: January 4, 2007
    Inventors: Yuji Goto, Mikio Kitaoka, Hiromitsu Umezawa, Tsugio Tokumasu, Toshihiko Watanabe, Akitoshi Mesaki, Takashi Kato, Masaharu Hoshikawa, Chiharu Nishida