Patents by Inventor Mikio Tajima

Mikio Tajima 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).

  • Light-emitting semiconductor device having a quantum well active layer, and method of fabrication
    Patent number: 7176480
    Abstract: A light-emitting diode has a low-resistivity silicon substrate on which there are laminated a buffer layer, an n-type lower confining layer, an active layer of multiple quantum well configuration, and a p-type upper confining layer. The active layer is constituted of cyclic alternations of a barrier sublayer of InGaN, a first complementary sublayer of AlGaInN, a well sublayer of InGaN, and a second complementary sublayer of AlGaInN. The proportions of the noted ingredients of the active sublayers are all specified. The first and the second complementary sublayers prevent the evaporation or diffusion of indium from the neighboring sublayers.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: February 13, 2007
    Assignee: Sanken Electric Co., Ltd.
    Inventors: Koji Ohtsuka, Junji Sato, Tetsuji Moku, Yoshitaka Tanaka, Mikio Tajima
  • Light-emitting semiconductor device having a quantum well active layer, and method of fabrication
    Publication number: 20050191778
    Abstract: A light-emitting diode has a low-resistivity silicon substrate on which there are laminated a buffer layer, an n-type lower confining layer, an active layer of multiple quantum well configuration, and a p-type upper confining layer. The active layer is constituted of cyclic alternations of a barrier sublayer of InGaN, a first complementary sublayer of AlGaInN, a well sublayer of InGaN, and a second complementary sublayer of AlGaInN. The proportions of the noted ingredients of the active sublayers are all specified. The first and the second complementary sublayers prevent the evaporation or diffusion of indium from the neighboring sublayers.
    Type: Application
    Filed: May 5, 2005
    Publication date: September 1, 2005
    Applicant: Sanken Electric Co., Ltd.
    Inventors: Koji Ohtsuka, Junji Sato, Tetsuji Moku, Yoshitaka Tanaka, Mikio Tajima