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Capacitance-type displacement measuring device

  • US 5,920,198 A
  • Filed: 09/15/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 09/20/1996
  • Status: Expired due to Term
First Claim
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1. A capacitance-type displacement measuring device provided with a rotatable rotor having circular outer circumferential face, and a stator having half-cylindrical inner circumferential face located at a predetermined gap against the outer circumferential face of the rotor, wherein;

  • the inner circumferential face of the stator is provided with transmitting electrode group composed of plural electrode being impressed with respectively different-phased alternating signals, and a receiving electrode insulated from the transmitting electrode group, of which receive signal is inputted into measuring circuit,and the outer circumferential face of the rotor is provided with a coupling electrode to couple capacitively with a plural of the electrode of the transmitting electrode group, characterized by;

    a step portion provided on one of the outer circumferential face of the rotor and the inner circumferential face of the stator to retain a predetermined gap between the opposing faces of the rotor and the stator,and a forcing means to force the stator to the rotor so that the rotor and the stator is abutted at the step portion.

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