Patents by Inventor Tamayo Hirokio

Tamayo Hirokio 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).

  • Waveguide type photodetector and a method of fabricating the same
    Patent number: 5285514
    Abstract: In a waveguide type photodetector for receiving and detecting a light guided thereinto, a groove is formed in a semiconductor substrate, a waveguide layer is formed on the semiconductor substrate, and a light absorbing layer for absorbing a light propagated through a waveguide in the waveguide layer is formed on the waveguide layer. The waveguide is formed as a three-dimensional waveguide formed in the waveguide layer due to the presense of the groove. The three-dimensional waveguide is maintained also under the light absorbing layer since the refractive index of a portion layered on the groove formed in the substrate is made large than that of portions other than this portion layered above the groove.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: February 8, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidetoshi Nojiri, Tamayo Hirokio