Patents by Inventor Tsukasa Ookawa

Tsukasa Ookawa 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).

  • Optical switch, element therefor, and optical switching method
    Patent number: 6870983
    Abstract: An optical switch, in which focal position of beams is adjusted to provide a high switching efficiency and a high stability in action without increasing a light source output of a control light, comprising a condensing means for making a signal light and a control light convergent and incident upon a nonlinear optical thin-film and wherein irradiation of the control light causes a change of the nonlinear optical thin-film in refractive index to thereby change the signal light into a transmitted light or a reflected light to take out the same as an output signal.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: March 22, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Hideto Momose, Yuuichi Sawai, Mitsutoshi Honda, Takashi Naitou, Hiroyuki Akata, Tsukasa Ookawa
  • Optical switch, element therefor, and optical switching method
    Publication number: 20040105612
    Abstract: An optical switch, in which focal position of beams is adjusted to provide a high switching efficiency and a high stability in action without increasing a light source output of a control light, comprising a condensing means for making a signal light and a control light convergent and incident upon a nonlinear optical thin-film and wherein irradiation of the control light causes a change of the nonlinear optical thin-film in refractive index to thereby change the signal light into a transmitted light or a reflected light to take out the same as an output signal.
    Type: Application
    Filed: May 29, 2003
    Publication date: June 3, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Hideto Momose, Yuuichi Sawai, Mitsutoshi Honda, Takashi Naitou, Hiroyuki Akata, Tsukasa Ookawa