Improved electronic weighing apparatus utilizing surface...

Details Improved electronic weighing apparatus utilizing surface... Improved electronic weighing apparatus utilizing surface...

G - Physics

01

G

G01G 3/14 (2006.01) G01G 3/13 (2006.01)

Patent

CA 2374084

A weighing apparatus includes a base (12) supporting a cantilevered elastic member (14) bearing a load platform (16). The interior of the elastic member (14) is hollowed and is provided with first (20) and second (22) piezoelectric transducers mounted on respective opposed posts. The transducers are arranged substantially parallel to each other with a small gap between them and are coupled to an amplifier (950, 952) to form a "delay line" and a positive feedback loop, to form a natural oscillator.

L'invention porte sur une balance comprenant une base (12) supportant un élément (14) élastique en porte-à-faux supportant lui-même un plateau (16) accueillant une charge. L'intérieur de l'élément (14) élastique est creux et est pourvu de premier (21) et second (22) transducteurs fixés sur des montants opposés. Les transducteurs sont disposés de façon à être pratiquement parallèles entre eux, un léger intervalle les séparant, et sont couplés à un amplificateur (950, 952) de façon à former une <= ligne de retard >= et une boucle à réaction, c'est-à-dire un oscillateur naturel.

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