INDUCTIVE PROXIMITY SWITCH
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United States of America Patent
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Issued Date -
May 28, 2015
app pub date -
Jul 30, 2013
filing date -
Aug 10, 2012
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Abstract
Inductive A proximity switch comprising an oscillator 1 and a transmitter coil 2 for generating an alternating magnetic field, a receiving circuit 3 comprising two receiving coils 4 and 5 operating in differential connection for detecting a metallic trigger 6, wherein the receiving coils 4 and 5 are arranged such that they can be influenced differently by the trigger 6 and the induced receiving voltages cancel one another out when the trigger 6 is at a desired switching distance is provided. The coils lie in a common coil former 7 and are completely embedded in the material of the coil former. The receiving coil 4 is arranged in the outer region of the coil former 7. The coil former 7 consists of LTCC ceramic with a coefficient of thermal expansion of less than 10 ppm/K.
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