Patents by Inventor Katsuharu Segi

Katsuharu Segi 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).

  • Semiconductor light emitting device
    Patent number: 4360919
    Abstract: An improved semiconductor light emitting device having a stabilized lateral mode oscillation and device current.In the present invention, a current rejecting layer and an etch-back preventive layer are added to a semiconductor laser provided with a clad layer composed of a projecting portion for confining light from an active layer and a portion for passing the light. The thicknesses of the layers, the relationships of forbidden band widths of the layers and their conductivity type are all specified. An easily manufactured semiconductor laser with an excellent current limit function and optical guide function are obtained and the lateral mode oscillation oscillation is stable.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: November 23, 1982
    Assignee: Fujitsu Limited
    Inventors: Takao Fujiwara, Kiyoshi Hanamitsu, Sigeo Ohsaka, Hiroshi Ishikawa, Nobuyuki Takagi, Katsuharu Segi