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Pressure-electric transducers

  • US 4,085,620 A
  • Filed: 09/28/1976
  • Issued: 04/25/1978
  • Est. Priority Date: 09/30/1975
  • Status: Expired due to Term
First Claim
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1. A pressure-electric transducer comprising a substrate having an opening for receiving pressure transmitting fluid;

  • a stress absorbing member having a connecting section provided with a fluid passage communicated with said opening and secured to said substrate, a neck section connected to the connecting section and having a diameter not larger than that of the connection section and a head section connected to the neck section and having a diameter larger than that of said neck section, said neck and said head sections being integral with said connecting section;

    a semiconductor pressure sensitive element mounted on the head section of said stress absorbing member with the pressure receiving surface of said pressure sensitive element disposed to close said fluid passage, said stress absorbing member having substantially the same linear expansion coefficient as said semiconductor pressure sensitive element; and

    means for deriving from said semiconductor pressure sensitive element an electric signal corresponding to the pressure of said pressure transmitting fluid, a detection casing containing said semiconductor pressure sensitive element, a temperature compensator contained in said detection casing and electrically connected to said pressure sensitive element, an amplifier casing removably connected to said detection casing, and an amplifier contained in said amplifier casing for amplifying said derived electric signal.

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