Inductive switch
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United States of America Patent
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Apr 20, 2010
Grant Date -
Jun 19, 2008
app pub date -
Sep 10, 2004
filing date -
Sep 11, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to an inductive sensor unit having one or several coils, which are mounted on a printed circuit board in a planar manner. According to the invention, a change in the inductance of a sensor coil due to leakage currents in the inductive actuator is correlated with the position of the actuator in two respects i.e., with the distance x to the sensor coils and with the overlapping y of the sensor coils. As a result, an inductive push button switch and an inductive position switching device (a sliding switch) are provided. The invention also relates to the evaluation of the inductance by means of reactance measurement. A relative evaluation of the influence of adjacent sensor coils increases the precision of response in push button switches and, generally, a relative evaluation of the influence of adjacent sensor coils is carried out in position switching devices.
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