Patents by Inventor Etsuko Fujisawa

Etsuko Fujisawa 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).

  • Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement
    Patent number: 6229102
    Abstract: A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: May 8, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Sato, Takao Inoue, Etsuko Fujisawa, Takashi Kitaguchi, Toshiyuki Furuta, Norihiko Murata, Mitsuru Shingyouchi
  • Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement
    Patent number: 6084577
    Abstract: A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: July 4, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Sato, Takao Inoue, Etsuko Fujisawa, Takashi Kitaguchi, Toshiyuki Furuta, Norihiko Murata, Mitsuru Shingyouchi
  • Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement
    Patent number: 5981884
    Abstract: A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: November 9, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Sato, Takao Inoue, Etsuko Fujisawa, Takashi Kitaguchi, Toshiyuki Furuta, Norihiko Murata, Mitsuru Shingyouchi
  • Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement
    Patent number: 5902968
    Abstract: A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: May 11, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuhiro Sato, Takao Inoue, Etsuko Fujisawa, Takashi Kitaguchi, Toshiyuki Furuta, Norihiko Murata, Mitsuru Shingyouchi