Patents by Inventor Hitoshi Umemoto

Hitoshi Umemoto 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 laser device
    Patent number: 6876685
    Abstract: A laser device having at least a semiconductor laser element, a window allowing light emitted from the emission end face of the semiconductor laser element to pass therethrough, a photodetector detecting a portion of emitted light reflected from the window that is not being transmitted, and a stem whereon the semiconductor laser element and the photodetector are installed. The window is disposed vertically above the semiconductor laser element. The photodetector is placed at an angle with respect to a horizontal plane and is located contiguous with the main surface of the stem. The laser device is capable of maintaining a stable APC drive regardless of the deterioration of the semiconductor laser element that may occur from continuous oscillation for a long time.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: April 5, 2005
    Assignee: Nichia Corporation
    Inventors: Hitoshi Umemoto, Hiroaki Matsumura, Masanao Ochiai
  • Semiconductor laser device
    Publication number: 20030231679
    Abstract: A laser device having at least a semiconductor laser element, a window allowing light emitted from the emission end face of the semiconductor laser element to pass therethrough, a photodetector detecting a portion of emitted light reflected from the window that is not being transmitted, and a stem whereon the semiconductor laser element and the photodetector are installed. The window is disposed vertically above the semiconductor laser element. The photodetector is placed at an angle with respect to a horizontal plane and is located contiguous with the main surface of the stem. The laser device is capable of maintaining a stable APC drive regardless of the deterioration of the semiconductor laser element that may occur from continuous oscillation for a long time.
    Type: Application
    Filed: June 10, 2003
    Publication date: December 18, 2003
    Inventors: Hitoshi Umemoto, Hiroaki Matsumura, Masanao Ochiai