Patents by Inventor Keizou Kumai

Keizou Kumai 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).

  • Patent number: 6359602
    Abstract: In a head-mounted display device, image display light emitted from a display device is directed towards the eye of an observer by changing the light path thereof by means of an optical system. The display device, optical system and a drive signal generating device for the display device are worn on the head of the observer by means of a holding member. This optical system is positioned in front of the display device emitting display light in a forward direction from a position separated radially from the visual axis of the observer when looking straight ahead. The drive signal generating device is located in a position separated radially from the visual axis with an interval from the display device and optical system.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: March 19, 2002
    Assignee: Shimadzu Corporation
    Inventors: Hisashi Amafuji, Ryutaro Nasu, Tetsuo Mayama, Keizou Kumai, Hiroyuki Hatanaka
  • Patent number: 6292158
    Abstract: A display system detects the orientation of the image display screen of a movable display device, the image display screen of which can be arbitrarily oriented, and outputs image data stored and related with the detected orientation of the image display screen to the movable display device, to display image corresponding to the image data. The display system changes the orientation of the image display screen stored and related with the image data according to change in the orientation of the image display screen of the movable display device, when the image data is output to the movable display device and a change signal is output.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: September 18, 2001
    Assignee: Shimadzu Corporation
    Inventors: Hisashi Amafuji, Ryutaro Nasu, Yasuhiko Handa, Keizou Kumai, Yasuhiro Nakahara
  • Patent number: D392629
    Type: Grant
    Filed: March 25, 1997
    Date of Patent: March 24, 1998
    Assignee: Shimadzu Corporation
    Inventors: Hisashi Amafuji, Keizou Kumai