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Pressure sensor

  • US 4,905,520 A
  • Filed: 10/12/1988
  • Issued: 03/06/1990
  • Est. Priority Date: 10/16/1987
  • Status: Expired due to Fees
First Claim
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1. In a pressure sensor with a housing in which a mechanical pressure receiving member and a connected mechanical electrical transducer are located and in which the moving portion of said pressure receiving member is attached at least indirectly with a permanent magnet which cooperates with or acts on a Hall-effect sensor and together with said Hall-effect sensor comprises said transducer, the improvement wherein the cross section of said housing in the vicinity of said permanent magnet and in a region between said permanent magnet and said Hall-effect sensor is designed, adjusted or tuned to attain an approximately linear magnet field strength decrease at said Hall-effect sensor and a linear characteristic response curve on motion of said permanent magnet from one near end position to another far end position of said permanent magnet, said housing having a round cross section in said region between said permanent magnet and said Hall Effect sensor, the inner surface of said housing wall in reference to said near end position adjacent said Hall-effect sensor of said permanent magnet being substantially cylindrical in said vicinity of said permanent magnet and substantially conical in said region between said Hall-effect sensor and said permanent magnet tapering in the direction of said permanent magnet, the outer surface of said housing wall being substantially cylindrical.

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