Patents by Inventor Yoshitsugu Fujino

Yoshitsugu Fujino 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).

  • Photo detect element and an optical semiconductor device
    Patent number: 6831344
    Abstract: An optical semiconductor device of the present invention is equipped with a photo detect element 10 comprising a photo detect part 7 provided with two photodiodes having two photodiodes having peak wavelength sensitivity in a visible light region and an infrared region, respectively and an amplifying operation processing circuit 8 for amplifying and processing outputs of the photodiodes, and characterized in that substrate resistivity R is as follows: 1≦R≦3(&OHgr;cm)
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: December 14, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Isao Ogawa, Takashi Iwasaki, Yoshitsugu Fujino
  • Photo detect element and an optical semiconductor device
    Publication number: 20030218175
    Abstract: An optical semiconductor device of the present invention is equipped with a photo detect element 10 comprising a photo detect part 7 provided with two photodiodes having two photodiodes having peak wavelength sensitivity in a visible light region and an infrared region, respectively and a amplifying operation processing circuit 8 for amplifying and processing outputs of the photodiodes, and characterized in that substrate resistivity R is as follows:
    Type: Application
    Filed: March 28, 2003
    Publication date: November 27, 2003
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Isao Ogawa, Takashi Iwasaki, Yoshitsugu Fujino