Patent ID: 9726471
Date: 2017-08-08
CPC Classifications: G01B,G01D

Claim:
1. A variable capacitor assembly, located inside a position sensor, the position sensor including a capacitance-detecting circuit for detecting a pair of alternative capacitance values of the variable capacitor assembly, the variable capacitor assembly comprising: a baseboard, further including: a dielectric coupling element, having a dielectric constant, located above the grounding electrode and the at least two power electrodes in a vertical direction perpendicular to the electrode layout surface, being movable along a moving path parallel to the longitudinal direction; wherein each of the at least two power electrodes has an action surface of parallel capacitance effect facing the grounding electrode and another action surface of fringing capacitance effect facing the moving path, an area of the action surface of parallel capacitance effect is larger than that of the action surface of fringing capacitance effect, the dielectric constant is ranged between 10 and 50; wherein, while the dielectric coupling element displaces along the moving path, a position of the at least two power electrodes and the grounding electrode is covered by the dielectric coupling element; wherein the capacitance-detecting circuit detects changes of the pair of the alternative capacitance values as the covering position alters, and thus a relative position of the dielectric coupling element on the moving path is determined.