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Proximity responsive capacitance sensitive method, system, and associated electrical circuitry for use in controlling mechanical and electro-mechanical equipment

  • US 5,081,406 A
  • Filed: 06/26/1990
  • Issued: 01/14/1992
  • Est. Priority Date: 06/26/1990
  • Status: Expired due to Fees
First Claim
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1. A system for controlling the motion of a potentially dangerous or other moving part which comprises means for tuning a filter circuit at or near a point of resonance in response to body capacitance generated when a person comes within a predetermined critical distance from said moving part, said filter circuit comprising a bandpass filter (BPF) network being operatively tunable below its point of resonance and connected to an antenna having a lumped capacitance which is operative to resonate with said bandpass filter network and control the transfer gain thereof, said antenna being further operative to add human body capacitance to said lumped capacitance and cause said BPF network to move towards its point of resonance, increase said transfer gain, and generate a detectable output signal which varies in amplitude in response to body capacitance dynamic changes in the capacitance dynamically coupled to said antenna whereby signals processed from the output of said filter circuit are utilized to stop, start or otherwise control the motion of said moving part.

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