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Magnetoresistive type position sensor having bias magnetic and magnet resistance elements in bias magnetic field thereof

  • US 6,020,736 A
  • Filed: 08/07/1995
  • Issued: 02/01/2000
  • Est. Priority Date: 08/25/1994
  • Status: Expired due to Term
First Claim
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1. A position sensor comprising:

  • an object to be detected made of a magnetic material fixed to a body of rotation and disposed within a predetermined range of an angle of rotation on a plane perpendicular to an axis of the body of rotation;

    a bias magnet magnetized in an axial direction thereof for generating a bias magnetic field to the body of rotation in a direction perpendicular to the axis of the body of rotation, said bias magnet being disposed radially outwardly of the object; and

    a magnetic resistance element disposed in the bias magnetic field generated directly from said bias magnet, at a position deviated from the position of disposing the object to be detected in an axial direction of the body of rotation and detecting a direction of a magnetic vector in the axial direction of the body of rotation, said magnetic resistance element being positioned on a plane which extends from one magnetic pole side of said bias magnet in the axial direction of said bias magnet, whereby said magnetic resistance element is subjected to a greatest possible magnetic field.

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