Patents by Inventor Mizuho SHIMOJIMA

Mizuho SHIMOJIMA 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).

  • Heater temperature control circuit and sensor device using the same
    Patent number: 11510286
    Abstract: The present invention provides a heater temperature control circuit including a heater and a control circuit that controls a temperature of the heater, wherein the control circuit includes a bridge circuit in which a first circuit and a second circuit are connected in parallel, and an operational amplifier connected to the bridge circuit, wherein in the first circuit, the heater and a resistor are connected in series, and a midpoint of the first circuit is connected to one input portion of the operational amplifier, and an output value Vout from the second circuit is input to the other input portion of the operational amplifier, the output value Vout being obtained by multiplying a division ratio of a target resistance value Rh of the heater and a resistance value R1 of the resistor with a reference voltage Vref of the bridge circuit.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: November 22, 2022
    Assignee: KOA CORPORATION
    Inventors: Toshitsugu Ueda, Hiroshi Oigawa, Mitsuo Ohashi, Mizuho Shimojima, Takaaki Yano
  • HEATER TEMPERATURE CONTROL CIRCUIT AND SENSOR DEVICE USING THE SAME
    Publication number: 20200296800
    Abstract: The present invention provides a heater temperature control circuit including a heater and a control circuit that controls a temperature of the heater, wherein the control circuit includes a bridge circuit in which a first circuit and a second circuit are connected in parallel, and an operational amplifier connected to the bridge circuit, wherein in the first circuit, the heater and a resistor are connected in series, and a midpoint of the first circuit is connected to one input portion of the operational amplifier, and an output value Vout from the second circuit is input to the other input portion of the operational amplifier, the output value Vout being obtained by multiplying a division ratio of a target resistance value Rh of the heater and a resistance value R1 of the resistor with a reference voltage Vref of the bridge circuit.
    Type: Application
    Filed: November 28, 2018
    Publication date: September 17, 2020
    Applicant: KOA CORPORATION
    Inventors: Toshitsugu UEDA, Hiroshi OIGAWA, Mitsuo OHASHI, Mizuho SHIMOJIMA, Takaaki YANO