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Rotational angle sensor having a magnetic member mounted on a rotatable shaft

  • US 5,455,508 A
  • Filed: 10/07/1993
  • Issued: 10/03/1995
  • Est. Priority Date: 10/20/1992
  • Status: Expired due to Fees
First Claim
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1. A rotational angle sensor comprising:

  • a bobbin having a central axis and a pair of spaced apart side edges;

    a freely-rotatable shaft provided at a center portion of said bobbin so as to extend in a direction vertical to the central axis of said bobbin;

    two coils which are wound around a half part of said bobbin between the center portion of said bobbin and one side edge thereof and around the other half part of said bobbin between the center portion of said bobbin and the other edge thereof, respectively; and

    a magnetic member which is linked to said shaft so as to be freely rotatable in said bobbin such that a rate at which said magnetic member is deviationally located at one side of said two coils is varied in accordance with a rotational angle of said shaft, thereby reflecting the rotational angle of said shaft to the variation of the inductance ratio of said two coils.

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