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Proximity detection device and proximity detection method

  • US 20110055305A1
  • Filed: 08/18/2010
  • Published: 03/03/2011
  • Est. Priority Date: 08/26/2009
  • Status: Active Grant
First Claim
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1. A proximity detection device of obtaining an approach determination or an approach position of an object, comprising:

  • plural transmitting electrodes corresponding to one dimension of two dimensions in a detection area on a supporting unit and receiving electrodes corresponding to the other dimension;

    a multiline driving unit that simultaneously applies periodic alternating voltages to at least two electrodes of the transmitting electrodes;

    a current measurement unit that measures currents or amounts of accumulated charge from the receiving electrodes in synchronization with driving to the transmitting electrodes;

    a computing unit that obtains the approach determination or the approach position of the object toward the detection area by converting the current values or the amounts of accumulated charge measured in the current measurement unit into values in response to electrostatic capacitances of respective intersections between the transmitting electrodes and the receiving electrodes; and

    a control unit that manages statuses and sequences of the multiline driving unit, the current measurement unit, and the computing unit,wherein the computing unit includesa linear computing unit that performs linear computation to convert the current values or the amounts of accumulated charge measured in the current measurement unit into values in response to the electrostatic capacitances of the respective intersections between the transmitting electrodes and the receiving electrodes, anda proximity computing unit that obtains the approach determination or the approach position of the object toward the detection area from an output of the linear computing unit, andthe linear computing unit includes a memory unit that stores an interim result of the computation to be read out at plural times.

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