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Sensor system for generating signals that are indicative of the position or change of position of limbs

  • US 8,558,791 B2
  • Filed: 08/07/2009
  • Issued: 10/15/2013
  • Est. Priority Date: 08/07/2008
  • Status: Expired due to Fees
First Claim
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1. A sensor system for generating electrical signals indicating the position and/or the movement of limbs with respect to a reference area, the system comprising:

  • a transmitter electrode,a voltage generator for applying an alternating voltage to the transmitter electrode and thereby creating an electric field around the transmitter electrode,a first receiver electrode in the field,a second receiver electrode in the field, anda detection circuit comprising high impedance inputs coupled with said first and second receiver electrode and being operable to detect a field-bridging effect caused by a hand or finger gesture and effective on the receiver electrodes, anda shielding electrode generally shielding the transmitter or the receiver electrode with respect to the detection circuit from the electric field, wherein a signal is fed to the shielding electrode which only differs in amplitude with respect to the alternating voltage applied to the transmitter electrode.

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