Patents by Inventor Yasuji Kawai

Yasuji Kawai 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, lamp failure detection method, and projector
    Patent number: 10039176
    Abstract: A discharge lamp lighting device includes: a storage unit that stores information; a lamp drive unit that supplies drive power to the discharge lamp; a voltage detection unit that detects the lamp voltage of the discharge lamp; and a control unit that, on the basis of the voltage detection value supplied from the voltage detection unit, stores in the storage unit error log information that indicates the operating state of the discharge lamp when change of the lamp voltage indicates a predetermined voltage characteristic.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: July 31, 2018
    Assignee: NEC DISPLAY SOLUTIONS, LTD.
    Inventors: Koichi Tagishi, Hiroki Tanaka, Yasuji Kawai
  • DISCHARGE LAMP LIGHTING DEVICE, LAMP FAILURE DETECTION METHOD, AND PROJECTOR
    Publication number: 20170231073
    Abstract: A discharge lamp lighting device includes: a storage unit that stores information; a lamp drive unit that supplies drive power to the discharge lamp; a voltage detection unit that detects the lamp voltage of the discharge lamp; and a control unit that, on the basis of the voltage detection value supplied from the voltage detection unit, stores in the storage unit error log information that indicates the operating state of the discharge lamp when change of the lamp voltage indicates a predetermined voltage characteristic.
    Type: Application
    Filed: September 30, 2014
    Publication date: August 10, 2017
    Inventors: Koichi TAGISHI, Hiroki TANAKA, Yasuji KAWAI
  • TRANSMISSION TERMINAL, DISPLAY APPARATUS, IMAGE DISPLAY TRANSMISSION SYSTEM PROVIDED WITH THE TRANSMISSION TERMINAL AND THE DISPLAY APPARATUS, AND DATA TRANSFER METHOD IMPLEMENTED IN THE SYSTEM
    Publication number: 20110169863
    Abstract: The present invention is for quickly performing image display in an image display system comprising a transmission terminal including an image accumulation section accumulating multiple image data the display order of which is specified, and a display apparatus connected to the transmission terminal via a network and including a cache data accumulation section accumulating multiple image data sent from the data transmission terminal and a display device displaying images of the image data accumulated in the cache data accumulation section.
    Type: Application
    Filed: September 30, 2008
    Publication date: July 14, 2011
    Inventor: Yasuji Kawai