Patents by Inventor Hidemitsu Yamazuka

Hidemitsu Yamazuka 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).

  • Dimming-control lighting apparatus for incandescent electric lamp
    Patent number: 6975078
    Abstract: A dimming-control lighting apparatus for an incandescent electric lamp with less accompanying color temperature change, using a dimming power source installed in TV studios or theater stages, is disclosed. The voltage of the first filament whose rated voltage is lower than the maximum output voltage of a dimming power source rapidly rises to the sawtooth voltage of the dimming power source, and after the first filament reaches a constant color temperature, the output of the second filament having the same rated voltage as the maximum output voltage of the dimming power source is delayed to thereby light the second filament.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: December 13, 2005
    Assignees: Nippon Hosos Kyokai, Marumo Electric Co., Ltd.
    Inventors: Naoki Yanai, Saburo Kimura, Hiroshi Kita, Hidemitsu Yamazuka
  • Dimming-control lighting apparatus for incandescent electric lamp
    Publication number: 20040169477
    Abstract: A dimming-control lighting apparatus for an incandescent electric lamp with less accompanying color temperature change, using a dimming power source installed in TV studios or theater stages, is disclosed. The voltage of the first filament whose rated voltage is lower than the maximum output voltage of a dimming power source rapidly rises to the sawtooth voltage of the dimming power source, and after the first filament reaches a constant color temperature, the output of the second filament having the same rated voltage as the maximum output voltage of the dimming power source is delayed to thereby light the second filament.
    Type: Application
    Filed: February 26, 2004
    Publication date: September 2, 2004
    Inventors: Naoki Yanai, Saburo Kimura, Hiroshi Kita, Hidemitsu Yamazuka