Patents by Inventor Jyunichi Uekariya

Jyunichi Uekariya 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 device and image display device with switching frequency
    Patent number: 7943890
    Abstract: An output of a load voltage detector is read by an A/D converter, and a reference value Is and a switching frequency are decided by a microcomputer. In order that the decided switching frequency can be achieved, a SET signal is inputted from a switching frequency counting unit to a drive controller, and a switching element is turned on. When a current flowing through the switching element, which is detected by a resistor, exceeds the reference value Is of a reference arithmetic unit, a RESET signal is inputted from a current detector to the drive controller, and the switching element is turned off. Thereafter, the reference value Is and the switching frequency are set so that the switching element can be turned on at the next time at timing when a regenerative current of a diode turns to substantial zero.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: May 17, 2011
    Assignee: Panasonic Electric Works Co., Ltd.
    Inventors: Hirofumi Konishi, Jyunichi Uekariya
  • DISCHARGE LAMP LIGHTING DEVICE AND IMAGE DISPLAY DEVICE
    Publication number: 20090323033
    Abstract: An output of a load voltage detector is read by an A/D converter, and a reference value Is and a switching frequency are decided by a microcomputer. In order that the decided switching frequency can be achieved, a SET signal is inputted from a switching frequency counting unit to a drive controller, and a switching element is turned on. When a current flowing through the switching element, which is detected by a resistor, exceeds the reference value Is of a reference arithmetic unit, a RESET signal is inputted from a current detector to the drive controller, and the switching element is turned off. Thereafter, the reference value Is and the switching frequency are set so that the switching element can be turned on at the next time at timing when a regenerative current of a diode turns to substantial zero.
    Type: Application
    Filed: December 21, 2006
    Publication date: December 31, 2009
    Applicant: MATSUSHITA ELECTRIC WORKS, LTD.
    Inventors: Hirofumi Konishi, Jyunichi Uekariya