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Electrode configuration for position detection and method for position detection

  • US 9,958,532 B2
  • Filed: 09/20/2012
  • Issued: 05/01/2018
  • Est. Priority Date: 09/23/2011
  • Status: Expired due to Fees
First Claim
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1. A method for detecting a position of an object relative to an electrode configuration comprising at least three electrodes, wherein a longitudinal center axis of a first electrode is arranged substantially parallel with respect to a longitudinal center axis of a second electrode, a longitudinal center axis of a third electrode is arranged in an acute angle relative to the longitudinal center axis of the first electrode, the method comprising:

  • during a first measurement, operating the second electrode as a receiving electrode and loading the first electrode with a first generator signal and the third electrode with a second generator signal for determining coverage of the electrode configuration by the object, wherein a first measurement signal is received from the second electrode, which is representative for a first coupling capacity between the second electrode and the first electrode,during a second measurement, operating the third electrode as a receiving electrode and loading the first electrode with the first generator signal and the second electrode with the second generator signal for determining the position, wherein at the third electrode a second measurement signal is received, which is representative for a second coupling capacity between the third electrode and the first electrode, and wherein the position is determined from the ratio of a change of the second coupling capacity to a change of the first coupling capacity due to a presence of the object.

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