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Capacitive control interface device and method adapted to the implementation of highly resistive measurement electrodes

  • US 9,983,746 B2
  • Filed: 04/09/2014
  • Issued: 05/29/2018
  • Est. Priority Date: 05/17/2013
  • Status: Active Grant
First Claim
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1. An interface device for detecting at least one object of interest in a measurement zone, comprising:

  • a detection surface provided with a plurality of capacitive measurement electrodes,electronic processing means comprising excitation means capable of polarizing said measurement electrodes at first alternating excitation electrical potential, and measurement means capable of measuring a capacitive coupling between said measurement electrodes and at least one object of interest,guard elements made of electrically conductive material, disposed near said measurement electrodes at least according to their face opposite the measurement zone, and polarized to an alternating guard electrical potential referenced to said first alternating excitation electrical potential, andelectrical connection paths disposed at least in part on said detection surface between the measurement electrodes and arranged in such a way as to connect said measurement electrodes to said electronic processing means,wherein the excitation means are arranged in such a way as to generate the first alternating excitation electrical potential with an excitation frequency so that the measurement electrodes coupled capacitively to at least one object of interest and their connection path have an electrical impedance at said excitation frequency the resistive part of which is below the modulus of the reactive part.

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