Patents by Inventor Ryoichi Masaki

Ryoichi Masaki 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).

  • Protected discharge lamp lighting system
    Patent number: 4928037
    Abstract: A discharge lamp lighting system including at least one switch device connected between a d.c. power supply and a discharge lamp which is turned on by a high frequency power generated through turning-on and -off of the switching device. In the discharge lighting system, the discharge lamp lighting operation is allowed to start when the d.c. power supply voltage reaches a predetermined voltage value A or over, and the discharge lamp lighting operation is stopped when the d.c. power supply voltage lowers smaller than a predetermined voltage value B, where the values A and B take a relation that B is smaller than A.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: May 22, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Kawabata, Soichiro Ogawa, Ryoichi Masaki
  • Original document size detecting arrangement
    Patent number: 4614874
    Abstract: An arrangement for detecting sizes of original documents for use in a copying apparatus or the like, which is capable of effecting size detection at high reliability irrespective of thicknesses of original documents, and in which an adverse effect due to cross-talk light by neighboring light emitting elements employed in it is eliminated for detection of various sizes based on presence of correct original documents.
    Type: Grant
    Filed: January 16, 1984
    Date of Patent: September 30, 1986
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hiroaki Fukuda, Kenji Sumiyoshi, Ryoichi Masaki, Zempei Tani