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System comprising a cellular network of capacitive pressure and shear-stress sensors and manufacturing process

  • US 10,451,493 B2
  • Filed: 07/16/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 07/18/2014
  • Status: Active Grant
First Claim
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1. A pressure sensor network system, comprising:

  • a sheet of dielectric material elastically deformable in compression and shear, the sheet of dielectric material having a first face and a second face;

    a network comprising a plurality of pressure sensor cells, the cells being arranged in at least three rows and at least three columns, each cell comprising a first capacitive sensor for sensing normal pressure in a first direction (Z),each capacitive sensor having a first electrode fixed to the first face of the sheet of dielectric material and a second electrode fixed to the second face of the sheet of dielectric material,said first electrode of the capacitive normal-pressure sensor of a cell being connected in series to a first electrically conductive track connecting a row of cells of the sensor network, andthe second electrode of the capacitive normal-pressure sensor of a cell being connected to a second electrically conductive track connecting a column of capacitive normal-pressure sensors of the sensor network; and

    addressing means adapted to measure the electrical capacitance of a capacitive sensor located at the intersection of a row and a column, said row corresponding to a first track connected to said first electrode and said column corresponding to another track connected to one of said second electrodes,wherein at least one cell of the sensor network includes a second capacitive sensor for sensing shear in a second direction (X) and a third capacitive sensor for sensing shear in a third direction (Y),each capacitive shear sensor having a first electrode fixed to the first face of the sheet of dielectric material and a second electrode fixed to the second face of the sheet of dielectric material, said first and second electrodes of the capacitive shear sensors being comb-shaped,said first electrodes of the capacitive sensors of a cell being connected in series, the second electrode of the capacitive sensor for sensing shear in the second direction (X) being connected to a third electrically conductive track connecting a row of capacitive sensors for sensing shear in the second direction (X) of the sensor network, andthe second electrode (6) of the capacitive sensor for sensing shear in the third direction (Y) being connected to a fourth electrically conductive track connecting a column of capacitive sensors for sensing shear in the third direction (Y) of the sensor network.

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