Load cell having a thin film strain-inducible element

Claim 1

A load cell comprising: a strain-inducible element having four thin portions deformable in the shape of a parallogram and having a pattern forming surface; A plurality of thin film deposited strain gauges formed on said pattern forming surface wherein each of said gauges is positioned in correspondence with said thin portions and wherein said strain gauges are interconnected to constitute a bridge network; differential amplifier means including a thin film differential amplifier resistance means; power supply means; potential divider means whose input is connected to the output of said power supply means and wherein said potential divider means includes a potential divider resistor means wherein the output of said divider means is connected to the input of said differential amplifier means; signal amplifier means including a thin film gain determining resistor means wherein one output of said bridge network is connected to one input of said signal amplifier means; zero-point setting means including a thin film setting resistor means wherein said setting means is connected to the output of said differential amplifier means and to one output of said bridge network; wherein each of said differential amplifier means, said potential divider means, said signal amplifier means and said zero-point setting means is deposited on said pattern forming surface together with said strain gauges in such a manner so that at least one of said differential amplifier resistor means, said divider resistor means, said gain determining resistor means and said setting resistor means is adjustable by trimming simultaneously with trimming adjustment of said strain gauges.