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DISPLACEMENT DETECTION DEVICE AND DISPLACEMENT DETECTION METHOD

  • US 20140230573A1
  • Filed: 04/25/2014
  • Published: 08/21/2014
  • Est. Priority Date: 10/28/2011
  • Status: Active Grant
First Claim
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1. A displacement detection device comprising:

  • a piezoelectric sensor including a piezoelectric substance and a pair of detection electrodes disposed on opposing surfaces of the piezoelectric substance;

    a voltage detector configured to measure a voltage generated by the piezoelectric sensor in response to to displacement of the piezoelectric substance;

    a switch coupled between the pair of detection electrodes; and

    a controller configured to open the switch for the voltage detector to measure the voltage generated by the piezoelectric sensor,wherein the controller is coupled to the voltage detector to detect an output voltage from the voltage detector and further configured to short-circuit the switch for a predetermined period of time after detecting the output voltage, andwherein the controller is further configured to calculate an amount of displacement of the piezoelectric sensor based on the output voltage detected from the voltage detector.

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