Patents by Inventor Yoshiyasu Sakaguchi

Yoshiyasu Sakaguchi 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).

  • DC discharge lamp lighting device
    Patent number: 5028844
    Abstract: A DC discharge lamp lighting device includes a main discharge means providing a main discharge-lamp current to a DC discharge lamp including a filament and at least one anode to form between them a discharge path. The main discharge means comprises means for switching an applied voltage between a main discharge starting voltage in synchronism with a luminance control signal and a main discharge maintaining voltage. Any contribution of a current limiting resistance element to power consumption in circuit operation upon lighting of the discharge lamp can be reduced, thereby reducing heat generation.
    Type: Grant
    Filed: February 9, 1990
    Date of Patent: July 2, 1991
    Assignee: Matsushita Electric Works, Ltd.
    Inventors: Yoshiyasu Sakaguchi, Eiji Shiohama, Shoichi Morii