Patents by Inventor Tsutomu Yonemitsu

Tsutomu Yonemitsu 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).

  • Displacement sensor including a voltage converting unit that contains a resistor connected to a piezoelectric element
    Patent number: 9778765
    Abstract: There is provided a displacement sensor which can precisely detect the amount of displacement given by an operator. A touch sensor which is a type of the displacement sensor has a piezoelectric element, a voltage converting unit and a detecting unit. The piezoelectric element instantaneously generates a voltage proportional to a pressing force (the amount of pressing). The voltage converting unit converts the voltage generated by the piezoelectric element, into a voltage proportional to a transition determined based on a predetermined time constant determined by an impedance of a resistor of the voltage converting unit and capacitances of a capacitor and the piezoelectric element, and a pressing force. The detecting unit integrates output voltages of the voltage converting unit, and calculates the pressing force (the amount of pressing) based on an integration value.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: October 3, 2017
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Toru Ishii, Yasushi Yamamoto, Tsutomu Yonemitsu
  • DISPLACEMENT SENSOR
    Publication number: 20140331791
    Abstract: There is provided a displacement sensor which can precisely detect the amount of displacement given by an operator. A touch sensor which is a type of the displacement sensor has a piezoelectric element, a voltage converting unit and a detecting unit. The piezoelectric element instantaneously generates a voltage proportional to a pressing force (the amount of pressing). The voltage converting unit converts the voltage generated by the piezoelectric element, into a voltage proportional to a transition determined based on a predetermined time constant determined by an impedance of a resistor of the voltage converting unit and capacitances of a capacitor and the piezoelectric element, and a pressing force. The detecting unit integrates output voltages of the voltage converting unit, and calculates the pressing force (the amount of pressing) based on an integration value.
    Type: Application
    Filed: July 24, 2014
    Publication date: November 13, 2014
    Inventors: Toru Ishii, Yasushi Yamamoto, Tsutomu Yonemitsu