Touch switch with integral control circuit

  • US 6,320,282 B1
  • Filed: 01/19/1999
  • Issued: 11/20/2001
  • Est. Priority Date: 01/19/1999
  • Status: Expired due to Term
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First Claim
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1. A touch switch apparatus for generating a control signal on an output line, comprising:

  • a touch pad comprising a first electrode and a second electrode in close proximity to said first electrode;

    a first resistor electrically coupled to said first electrode;

    a second resistor electrically coupled to said second electrode;

    a control circuit in close proximity to said touch pad;

    said control circuit electrically coupled to said first and second resistors;

    said control circuit having an input node for receiving an input signal from a remote signal source;

    said touch pad being configured to receive a field generation signal;

    wherein said field generation signal causes an electric field to be generated about said touch pad;

    said control circuit being responsive to a stimulus affecting said electric field;

    said control circuit being configured to selectively generate a control signal in response to said stimulus affecting said electric field; and

    said control circuit having an output node for transmitting said control signal on said output line to a remote device;

    wherein each of said first and second resistors has a value such that said apparatus has a relatively low input impedance compared to the impedance of a contaminant in proximity to at least one of said first and said second electrodes.

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