Patents by Inventor Kooji Fukuma

Kooji Fukuma 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).

  • Deflection yoke and cathode-ray tube apparatus comprising the same
    Patent number: 5668447
    Abstract: A color cathode-ray tube which includes a deflection yoke having a convergence correcting device and an electron gun provided to the deflection yoke for generating a multiplicity of electron beams.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: September 16, 1997
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.
    Inventors: Nobutaka Okuyama, Soichi Sakurai, Kooji Fukuma, Hiroshi Yoshioka, Masao Obara, Naoki Ito, Atsushi Takeyama, Yoshio Satoh
  • Deflection yoke and cathode-ray tube apparatus comprising the same
    Patent number: 5548190
    Abstract: A color cathode-ray tube which includes a deflection yoke having a convergence correcting device and an electron gun provided to the deflection yoke for generating a multiplicity of electron beams.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: August 20, 1996
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.
    Inventors: Nobutaka Okuyama, Soichi Sakurai, Kooji Fukuma, Hiroshi Yoshioka, Masao Obara, Naoki Ito, Atsushi Takeyama, Yoshio Satoh
  • Deflection yoke and cathode ray tube having the same
    Patent number: 5498939
    Abstract: A deflection yoke attached to a color cathode ray tube forming multiple electron beams arranged in line, and in particular a deflection yoke having convergence correction apparatus. Circuit components such as a plurality of resistors, variable resistors, and diodes are connected in parallel with vertical deflection coils. A part of a vertical deflection current flowing through the vertical deflection coils is diverted to the circuit components. Furthermore, the amount of the diverted current is made adjustable so that it will differ between a former part of a vertical deflection period and a latter part thereof. As a result, horizontal line misconvergence at upper and lower ends of the screen can be completely corrected.
    Type: Grant
    Filed: January 9, 1995
    Date of Patent: March 12, 1996
    Assignees: Hitachi, Ltd., Hitachi Mizusawa Electronics Co., Ltd.
    Inventors: Kooji Fukuma, Soichi Sakurai, Nobutaka Okuyama, Yoshio Satoh, Yoshihiro Obara