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Capacitive sensor to detect a finger for a control or command operation

  • US 20070114073A1
  • Filed: 10/24/2006
  • Published: 05/24/2007
  • Est. Priority Date: 10/28/2005
  • Status: Abandoned Application
First Claim
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1. Capacitive sensor to detect a finger for operation of a control or command, comprising A) an electrical insulating layer forming a detection surface fitted with position references for application of a finger and generation of a signal by positioning or movement of the finger, B) a capacitive layer covered by the insulating layer and formed by a stack of alternating conductive sections and non-conductive sections placed on edge, at least some of the conductive layers being linked to elementary contacts to form parts of capacitors distributed in cells, the elementary contacts being connected in parallel to a cell connector, a part of the elementary capacitor being completed by the surface of the finger applied to the insulating layer to form a capacitor, the capacitance of all capacitors of a cell being added together in the signal supplied by the cell, C) a processing circuit to which are linked the cell connectors of the capacitive cells and which receives the capacitive signals to evaluate and compare them and to establish whether they correspond to the presence of a finger, and to determine the nature of the finger.

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