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Capacitive position sensor including a scale with integral topographical features which effect the mutual capacitance between cursor electrodes
Capacitive position sensor including a scale with integral topographical features which effect the mutual capacitance between cursor electrodes
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机译:电容式位置传感器,包括具有整体地形特征的标尺,可影响光标电极之间的互电容
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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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