| 摘要 |
A load measuring method and a load measuring apparatus employ two piezoelectric elements having the same characteristic. When a load is applied to a first piezoelectric element, a voltage applied to the first piezoelectric element is feedback-controlled so as to cause the output from a first strain gauge affixed to the first piezoelectric element to be reduced to zero, whereby deformation of the first piezoelectric element applied with the load is suppressed to zero. The load applied to the first piezoelectric element is measured from a deformation amount of a second strain gauge affixed to the second piezoelectric element to which is applied the same voltage as the voltage applied to the first piezoelectric element and which is deformed in amount accurately corresponding to that of deformation to be naturally generated in the first piezoelectric element.
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