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Apparatus and method for sensing the degree and touch strength of a human body on a sensor

  • US 7,006,078 B2
  • Filed: 05/07/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 05/07/2002
  • Status: Expired due to Fees
First Claim
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1. A sensor for sensing the contact level of a human body comprising:

  • a plurality of sensing devices arranged in parallel, each of said sensing devices having a selection node initially connected to ground;

    a capacitor, connected in series with said plurality parallel of sensing devices, defining a coupling node therebetween;

    a current source for delivering a charge to said capacitor;

    a current sink for draining said current from said capacitor; and

    an output device for outputting a signal based on the voltage at said node;

    wherein each of said sensing devices comprises;

    a draining capacitor connected to said coupling node;

    a sensing point in series with said draining capacitor; and

    an isolating capacitor in series with said sensing point and connected to said selecting node;

    wherein said sensing point defines a resistance to ground when in contact with a human body part.

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