Patents by Inventor Tatsuroh Ikeda

Tatsuroh Ikeda 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).

  • Surface emitting laser and method of manufacturing the same
    Patent number: 5373520
    Abstract: A current constriction layer surrounding a vertical-cavity region is formed in a cladding layer of a surface emitting laser. The forbidden band width of the material forming this current constriction layer is wider than the forbidden band width of a material forming the cladding layer. Further, the current constriction layer and the cladding layer are formed of semiconductors, and conduction types thereof are different from each other. Further, the upper surface of the cladding layer covering the current constriction layer has a step in the periphery of vertical-cavity region.
    Type: Grant
    Filed: August 11, 1993
    Date of Patent: December 13, 1994
    Assignee: Fujitsu Limited
    Inventors: Hajime Shoji, Koji Otsubo, Tatsuroh Ikeda, Manabu Matsuda, Hiroshi Ishikawa