Patents by Inventor Moriaki Okuda

Moriaki Okuda 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).

  • Discharge lamp lighting apparatus
    Patent number: 6429603
    Abstract: The discharge lamp lighting apparatus includes: a direct current power supply E; switching elements Q1 and Q2 for switching a direct current supplied from the direct current power supply E so as to generate a high frequency current; a discharge lamp load circuit LAC1 which is constructed in a manner that a discharge lamp LA and a coupling capacitor C4 are connected in series, and the discharge lamp LA is lit by a high frequency current generated by the switching elements Q1 and Q2; a switching element control circuit IC1 for controlling the switching elements Q1 and Q2. The discharge lamp lighting apparatus is further provided with a protective circuit NP2 which distinguishes a fault of the discharge lamp LA by detecting a voltage generated in the coupling capacitor C4, and outputs a control signal to the switching element control circuit IC1.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: August 6, 2002
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Electric Lighting Corporation
    Inventors: Kazuhiko Tsugita, Kouji Shibata, Tetsuya Kobayashi, Isamu Ogawa, Kenji Hamazaki, Hiroaki Nishikawa, Naoki Wada, Osamu Ishikawa, Moriaki Okuda, Yasunori Ieki