Weight detecting apparatus with electrodes detecting changes...

Details Weight detecting apparatus with electrodes detecting changes... Weight detecting apparatus with electrodes detecting changes...

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G01G 3/02 (2006.01) G01G 3/12 (2006.01) G01G 7/06 (2006.01) G01G 19/56 (2006.01) G01G 21/24 (2006.01) G01L 1/14 (2006.01) H05B 6/68 (2006.01) H05B 6/80 (2006.01)

Patent

CA 1289576

Abstract: A scale for measuring the weight of an object detects a change in electrostatic capacity due to a change in the distance between a pair of electrodes. For this purpose a pressure sensitive sensor has flat plates composed of two elastic insulators glued parallel to each other with a predetermined gap between electrodes provided on confronting sides of the flat plates. This gap is enclosed to prevent entry of dust or moisture between the plates, except for a small hole that allows pressure equalising air to pass through. The surfaces of the sensor are coated with a water-repellent substance to eliminate effects of leakage current due to any deposit of dust or moisture on the surface. As a result, the weight can be measured accurately, avoiding errors due to temperature or humidity changes.

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