Patents by Inventor Masahide Kita

Masahide Kita 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).

  • Patent number: 6046551
    Abstract: A discharge lamp lighting control device comprises an H-bridge circuit connected between the secondary coil of a transformer and a discharge lamp and provided with a first pair of transistors and a second pair of transistors, capable of converting a DC voltage produced from an AC voltage that appears at the secondary coil of the transformer into an AC voltage whose polarity is changed at predetermined intervals so as to apply the AC voltage to the discharge lamp. The first pair of transistors have withstand voltage characteristic superior to that of the second pair of transistors. The on-state resistances of the four transistors of the first and second pairs can be equal to each other so that the difference between the on-state resistances may be ignored. A control unit turns on only the first pair of transistors when applying a high voltage to the discharge lamp to cause a discharge to pass through the gas contained in the discharge lamp.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: April 4, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masahide Kita
  • Patent number: 6008594
    Abstract: A discharge lamp lighting controller that detects the voltage applied to a discharge lamp used by a vehicle, for example, and stops power supply to the discharge lamp if the voltage goes out of an estimated rated voltage range in a design stage. Circuit components are protected from possible impairment due to excessive current that may flow depending on the state of the discharge lamp under the constant power control of the discharge lamp.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: December 28, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masahide Kita, Kenji Nakamura, Masahiro Yabuta