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Capacitive position sensor with an electrode array cursor and topographically featured scale
Capacitive position sensor with an electrode array cursor and topographically featured scale
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机译:带有电极阵列光标和地形特征标尺的电容式位置传感器
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摘要
A capacitive position sensor has a scale (10), having hollow or raised topographical features, and a cursor (20) having an electrode array comprising at least two transmitting electrodes (21a, 21b) and at least one receiving electrode (21c) separated by shielding electrodes (21g). The coupling capacitances (Cac, Cbc) between transmitting and receiving cursor (20) electrodes are modified as a function of the position (x) of the scale topographic feature (11) relative to the cursor, the evaluation of the variation of the signals picked up by the receiving electrode permitting a precise measurement of the relative displacement between scale and cursor.
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