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Non-oriented direct coupled gear tooth sensor using a Hall cell

  • US 4,745,363 A
  • Filed: 11/25/1986
  • Issued: 05/17/1988
  • Est. Priority Date: 07/16/1986
  • Status: Expired due to Term
First Claim
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1. A direct coupled gear tooth sensor to sense the presence or absence of gear teeth or similar ferrous objects as they rotate past a sensor, independent of the angular orientation of said sensor to said gear teeth, comprising:

  • a single permanent magnet;

    a substantially planar Hall cell integrated circuit package having opposed first and second planar surfaces, said package being positioned adjacent to one polar end of said magnet such that the flux lines from said magnet have essentially no component perpendicular to the plane of said Hall cell in the absence of said teeth;

    means to steer and concentrate the flux lines of said magnet perpendicular to the plane of said Hall cell when said flux lines are modulated by the presence of a ferrous gear tooth or similar ferrous object, said means comprising first and second soft iron flux concentrators appended to said one planar end of said magnet, said concentrators being arranged adjacent respective opposed planar surfaces of said package and off center from each other.

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