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Method for capacitive image acquisition

  • US 6,365,888 B2
  • Filed: 02/13/2001
  • Issued: 04/02/2002
  • Est. Priority Date: 08/13/1998
  • Status: Expired due to Fees
First Claim
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1. A method for capacitive image acquisition, which comprises:

  • a) dividing an area to be acquired as an image in a grid-shaped array into pixels assigned an assembly of electrical conductors comprising, for each pixel, a measuring conductor and a shielding conductor;

    b) placing the area to be acquired as an image opposite the measuring conductors, so that a capacitance is present between the pixels and the measuring conductors in each case dependent on the relevant pixel;

    c) at each pixel, connecting the measuring conductor and the shielding conductor to the same electrical potential and disconnecting from the potential;

    d) at each pixel, discharging a charge present on one of the measuring conductor and the shielding conductor onto a respective collecting capacitor, and simultaneously compensating a potential difference between the measuring conductor and the shielding conductor; and

    e) repeating steps c and d until the charges collected on the collecting capacitors have at least a value predetermined to be sufficient for a separate measurement of each collecting capacitor.

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