Displacement sensor including a voltage converting unit that contains a resistor connected to a piezoelectric element
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United States of America Patent
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Oct 3, 2017
Grant Date -
Nov 13, 2014
app pub date -
Jul 24, 2014
filing date -
Jan 25, 2012
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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.
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