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Proximity selectro with integral magnet, pole-piece plate and pair of magnetic transducers

  • US 4,859,941 A
  • Filed: 03/18/1987
  • Issued: 08/22/1989
  • Est. Priority Date: 03/18/1987
  • Status: Expired due to Fees
First Claim
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1. A proximity detector for detecting a ferromagnetic article passing by a side of said detector comprising:

  • a magnet having north and south pole ends, said magnet being oriented with one of said pole ends at said detector side;

    a ferromagnetic pole piece consisting of a plate portion with one of the two major plate surfaces mounted adjacent to said one pole end and one extending portion;

    a single silicon integrated circuit comprising a pair of side-by-side Hall elements mounted to the outer and opposite major plate surface so that the difference in electrical output signals of the two transducers respectively is a function of the nearness of approach of the passing ferromagnetic article, a differential amplifier means connected to the outputs of said Hall elements for amplifying the Hall elements'"'"'difference signal, and a Schmitt-trigger circuit having an input connected to the output of said amplifier means;

    said magnet having one corner formed by said one pole end and an adjacent side, said one extending portion being adjacent to said one side of said magnet, said one magnet corner being about orthogonal to a line passing through the centers of said side-by-side Hall elements.

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