Patents by Inventor Shuichi Fujikura

Shuichi Fujikura 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).

  • Electrophotographic printer and fixing unit controlling apparatus therfor
    Patent number: 6014531
    Abstract: A fixing unit has a heat roller with a heater element built therein, a pressure roller disposed to oppose the heat roller and holds and advances a print medium therebetween in sandwiched relation. A thermistor is in contact with the heat roller and detects the temperature of the heat roller. Another thermistor detects the temperature of the pressure roller. A control circuit controls energization of the heater element so as to maintain the temperature of the heat roller to a target temperature. The heater element is energized to maintain a constant value of Tc given by an equation Tc=Th+k.multidot.Tp where Th is a surface temperature of the heat roller, Tp is a surface temperature of the pressure roller, and k is a coefficient having the range of 0<k<1.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: January 11, 2000
    Assignee: Oki Data Corporation
    Inventors: Norio Ebata, Daisuke Kobayashi, Shuichi Fujikura