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High-frequency oscillation type proximity sensor

  • US 7,030,626 B2
  • Filed: 06/17/2002
  • Issued: 04/18/2006
  • Est. Priority Date: 06/18/2001
  • Status: Active Grant
First Claim
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1. A high-frequency oscillation proximity sensor, comprising:

  • a two-thread coil formed of two coil conductors each having a first end and a second end, joined together at their respective first ends to form a joint connection end and twisted together, one of the two coil conductors being used as a resonance circuit coil and the other as an internal resistance compensation coil,a drive circuit for supplying a drive current to the joint connection end of the two-thread coil for oscillation,a compensation means for making a current having the same intensity as a current flowing from the first end to the second end of the resonance circuit coil flow from the second end of the resonance circuit coil to the second end of the internal resistance compensation coil to thereby virtually short-circuit an internal resistance of the resonance circuit coil.

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