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Paper dispenser with proximity detector

  • US 20050072874A1
  • Filed: 09/09/2004
  • Published: 04/07/2005
  • Est. Priority Date: 02/09/2001
  • Status: Active Grant
First Claim
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1. A paper dispenser comprising:

  • a housing having an inner chamber adapted to support a roll of paper and having a dispensing aperture;

    a motor adapted to dispense paper from the roll of paper through the dispensing aperture; and

    a proximity detection circuit comprising;

    an antenna;

    an oscillator circuit adapted to provide charge to the antenna;

    an operational amplifier adapted to operate as a unity gain follower and receiving an antenna signal from the antenna;

    a detector circuit adapted to receive the antenna signal via the operational amplifier and to output a detection signal in response to changes in the antenna signal; and

    a comparator adapted to receive the detection signal and to actuate the motor in response thereto.

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