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Proximity sensor and proximity detection method

  • US 20090051355A1
  • Filed: 08/31/2006
  • Published: 02/26/2009
  • Est. Priority Date: 09/02/2005
  • Status: Abandoned Application
First Claim
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1. A proximity sensor for detecting proximity of a metal, wherein a driving signal is output to a resonant circuit that includes a capacitor connected to a detecting coil, and the proximity of the metal is detected based on a phase shift of freely oscillating waves that are attenuatedly output from the resonant circuit after an output of the driving signal is stopped, the proximity sensor comprising:

  • a controller that;

    outputs the driving signal to the resonant circuit; and

    measures a phase shift of oscillating waves that is involved in the proximity of the metal based on the freely oscillating waves that are attenuatedly output from the resonant circuit after the output of the driving signal is stopped.

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