Patent ID: 7511482
Filing Date: 2009-03-31
Classification: H03K

Abstract:
1. Inductive proximity switch, comprising: an at least partially metal housing, at least one transmitting coil, two receiving coils which are connected in series in opposite directions and which are located symmetrically relative to the at least one transmitting coil, and an evaluation circuit which is connected to the receiving coils, wherein a pre-damping element is provided on a back of the receiving coils which is opposite an influence side of the receiving coils, and wherein the pre-damping element has pre-damping properties that at least approximately correspond to pre-damping properties of the housing on the influence side, wherein the receiving coils are located in ferromagnetic pot-shaped cores, wherein the ferromagnetic pot-shaped cores are arranged back-to-back, and wherein the at least one transmitting coil, without a coil body, is wound directly onto the pot-shaped cores and has a length that corresponds exactly to the sum of the lengths of the pot-shaped cores.