Load cell unit calculating change based on detected temperature and weight checker, electronic balance, and balance using same
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United States of America Patent
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Jun 12, 2012
Issued Date -
Oct 15, 2009
app pub date -
Aug 24, 2007
filing date -
Aug 24, 2007
priority date (Note) -
Withdrawn
status (Latency Note)
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Abstract
A load cell unit which can satisfactorily measure the weight of a measured object if ambient temperature changes, and a weight checker and an electric balance using the load cell unit, are provided. A strain generating element includes plural strain generating portions. Each of strain gauges is a gauge of a temperature/sensitivity compensated type and is placed in a position on a corresponding strain generating portion. A bridge circuit includes the strain gauges. A zero compensation element compensates the zero of the bridge circuit in accordance with the temperature of the strain generating element, to roughly correct an output of the bridge circuit. A thermal sensitive resistor is a temperature sensor for detecting the temperature of the strain generating element. The zero compensation element and the thermal sensitive resistor are provided on a thick portion interposed between adjacent strain generating portions. A signal processor minutely corrects a roughly-corrected output of the bridge circuit. Thus, software compensation of zero can be further provided to an output of the bridge circuit, to which circuital compensation of zero is provided.
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