| 摘要 |
A weight scale includes a capacitive force load cell for linearly transducing force into electrical capacity. A C-shaped spring supports two capacitor plates adjacent the distal ends of the arms with the surfaces of the plates being normally parallel. Weight is transmitted from the platform of the scale to a pin which acts to separate the arms against the spring force. The plates are shaped, preferably triangularly, so that the change in capacitance as they separate is linear. The load cell is connected in circuit with an oscillator so that the change in capacitance is directly proportional to change in frequency as a measure of the weight of the load on the scale's platform.
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