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Self-induction-type position detector device for detecting object position

  • US 20030102862A1
  • Filed: 12/31/2002
  • Published: 06/05/2003
  • Est. Priority Date: 03/15/1999
  • Status: Active Grant
First Claim
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1. A position detector device comprising:

  • a coil section including at least one coil to be excited by an A.C. signal;

    a magnetism-responsive member movable relative to said coil section, wherein relative positions between said magnetism-responsive member and said coil section vary in response to displacement of an object to be detected and impedance of said coil is caused to vary in response to a variation in the relative positions in such a manner that a voltage produced in said coil is caused to vary in response to a variation in the impedance of said coil during the variation in the relative positions within a predetermined range;

    a reference-voltage generation circuit adapted to generate at least one predetermined reference voltage in the form of an A.C. signal; and

    an arithmetic operation circuit coupled to said coil and reference-voltage generation circuit, said arithmetic operation circuit adapted to perform an arithmetic operation between said voltage produced in said coil and said predetermined reference voltage, so as to generate at least two A.C. output signals having predetermined cyclic amplitude functions as amplitude coefficients, the cyclic amplitude functions of the two A.C. output signals being different, in their cyclic characteristics, from each other by a predetermined phase.

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