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Push amount detecting sensor and touch input device

  • US 10,120,477 B2
  • Filed: 03/27/2015
  • Issued: 11/06/2018
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. A push detecting sensor comprising:

  • a touch panel that includes a piezoelectric sensor that outputs a push signal corresponding to a displacement amount when a surface of the touch panel is pushed;

    a touch detecting sensor that outputs a touch detection signal when the surface of the touch panel is touched;

    a push amount calculating circuit that integrates a difference between the push signal and a reference potential to generate a push amount detection signal; and

    a switching element that controls the push amount calculating unit, based on a state of the touch detection signal, to switch the push amount calculating circuit between integrating the difference between the push signal and the reference potential and resetting the reference potential,wherein the switching element controls the push amount calculating circuit to integrate the difference between the push signal and the reference potential when the state of the touch detection signal indicates an operation state in which the touch panel is being touched, andwherein the switching element controls the push amount calculating circuit to reset the reference potential when the state of the touch detection signal switches to an untouched state of the touch panel to stabilize the reference potential.

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