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Load cell and temperature correction of the same

  • US 4,747,456 A
  • Filed: 03/30/1987
  • Issued: 05/31/1988
  • Est. Priority Date: 03/28/1986
  • Status: Expired due to Fees
First Claim
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1. A load cell, comprising:

  • a beam member having a thin material deformable portion thereon;

    an insulator film formed directly on a surface of said beam member;

    a bridge circuit formed on said insulator film and including thin film strain gauges and a zero point balance correcting resistor wherein said thin film strain gauges are formed on said film over said thin material deformable portion of said beam;

    leads of thin film conductors for connection of said bridge circuit;

    a span resistor member including a first substrate applied to said insulator film away from said thin material deformable portion of said beam member and a span temperature correcting thin film resistor formed on said substrate and connected to said bridge circuit, said span temperature correcting thin film resistor having a temperature coefficient; and

    a zero point resistor member including a second substrate applied to said insulator film away from said thin material deformable portion of said beam member and a zero point balance temperature correcting thin film resistor formed on said substrate and connected to said bridge circuit, said zero point balance temperature correcting thin film resistor having a temperature coefficient.

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