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Inductive proximity switch

  • US 5,012,206 A
  • Filed: 04/20/1990
  • Issued: 04/30/1991
  • Est. Priority Date: 04/20/1989
  • Status: Expired due to Term
First Claim
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1. An inductive proximity switch comprising:

  • oscillator means for producing an oscillator output signal having a substantially constant frequency and a substantially constant amplitude;

    sensor resonant circuit means adapted to be influenced by the approach of electrically conductive nonmagnetic nonferrous (NF) objects and ferromagnetic (FE) objects, and having a natural resonant frequency when it is uninfluenced by the approach of an object; and

    coupling means for loosely coupling the oscillator output signal to the sensor resonant circuit means such that there is substantially no interaction between the oscillator means and the sensor resonant circuit means;

    wherein the frequency of the oscillator output signal and the natural resonant frequency of the sensor resonant circuit means are set to deviate from each other by a predetermined frequency deviation.

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