Patents by Inventor Teppei Kagata

Teppei Kagata 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).

  • High-pressure discharge lamp light source device having a power supply device with a switching state for switching from a direct current drive in a standby state to an alternating current drive in an operating state and projector
    Patent number: 8044334
    Abstract: To stabilize the arc bright point position of a discharge lamp and suppress deformation of an electrode when an ultrahigh-pressure discharge lamp is operated with extremely low electric power, the lamp is operated by supplying power from a power supply device having a step-down chopper circuit and a full bridge circuit, a rectangular wave alternating current being supplied when it is operated with rated power or dimmed power (about 60 to 80% of rated power), a DC current being supplied during standby power operation of at most 0.5×P (W) with respect to the maximum operating power P (W). Moreover, the high-pressure discharge lamp light source device may be mounted on a projector for projecting images and the mode being changed to standby power operation when there is no change in an image signal, for example, for a prescribed period of time.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: October 25, 2011
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventors: Teppei Kagata, Tetsu Okamoto, Tetsuji Hirao
  • HIGH-PRESSURE DISCHARGE LAMP LIGHT SOURCE DEVICE AND PROJECTOR
    Publication number: 20100128232
    Abstract: To stabilize the arc bright point position of a discharge lamp and suppress deformation of an electrode when an ultrahigh-pressure discharge lamp is operated with extremely low electric power, the lamp is operated by supplying power from a power supply device having a step-down chopper circuit and a full bridge circuit, a rectangular wave alternating current being supplied when it is operated with rated power or dimmed power (about 60 to 80% of rated power), a DC current being supplied during standby power operation of at most 0.5×P (W) with respect to the maximum operating power P (W). Moreover, the high-pressure discharge lamp light source device may be mounted on a projector for projecting images and the mode being changed to standby power operation when there is no change in an image signal, for example, for a prescribed period of time.
    Type: Application
    Filed: November 24, 2009
    Publication date: May 27, 2010
    Applicant: USHIO DENKI KABUSHIKI KAISHA
    Inventors: Teppei KAGATA, Tetsu OKAMOTO, Tetsuji HIRAO