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Package for speed sensing device having minimum air gap

  • US 5,250,925 A
  • Filed: 05/11/1992
  • Issued: 10/05/1993
  • Est. Priority Date: 05/11/1992
  • Status: Expired due to Term
First Claim
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1. A rugged magnetic sensor assembly which includes a housing having an opening for receiving a magnetic sensing unit, said sensor assembly comprising:

  • a prepackaged magnetic sensing unit which is not sufficiently rugged to be used in a given application, said sensing unit having first and second external surface areas and comprised of an encapsulated sensing device having electrical leads, wherein the encapsulation is not adequately protective of the electrical lead areas of said prepackaged sensing unit, said first external surface being a sealing surface and said second external surface being proximate said sensing device;

    a housing having an opening therein adapted to cooperatively receive said sensing unit;

    said sensing unit of size and shape complementary to said housing opening, effective to be at least partially received in said opening of said housing;

    said sensor unit at least partially disposed within said opening and having said first exterior surface cooperatively disposed with respect to an interior surface of said housing, which interior surface defines said opening in said housing, and leaving said second exterior surface exposed outside said housing; and

    means for sealing said exterior surface on said sensing unit against said interior surface of said housing;

    wherein said sealing means, external surface of said sensing unit, and said interior surface of said housing define an enclosure for retaining said sensing unit in fixed position and for protecting said electrical lead areas of said sensing unit from deleterious environmental effects of said given application, and wherein portions of said housing do not overlie said second surface portion of said sensing unit and thereby substantially decrease magnetic sensitivity of said sensing unit.

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