Load cell with strain gauges having low temperature dependent coefficient of resistance
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United States of America Patent
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Apr 26, 1994
Grant Date -
N/A
app pub date -
May 27, 1992
filing date -
Sep 26, 1990
priority date (Note) -
Expired
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Abstract
A load cell utilizable in a weighing apparatus. The load cell is fabricated by forming a strain gauge pattern (4) of a copper-nickel alloy on a surface of a strain inducing element (1) by the use of a sputtering technique and subsequently heat-treating the strain gauge pattern under an oxygen-free atmosphere, wherein the weight ratio of copper and nickel is chosen to be of a value effective to permit the temperature dependent coefficient of resistance of the strain gauge pattern (4), which undergoes shrinkage and expansion together with the strain inducing element (1), to be substantially zero. In this way, the load cell can be obtained which is not affected by a change in temperature and which gives a high measurement precision.
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