Patent ID: 8203335
Filing Date: 2012-06-19
Classification: H03K

Abstract:
1. An inductive proximity switch device comprising: a plurality of inductive elements disposed on a common substrate, the inductive elements arranged in one or more metalizing layers on the common substrate, the inductive elements comprising an evaluation circuit coupled to at least one of the plurality of the inductive elements, wherein the transmitter coil is configured to generate a magnetic stray field that reaches a metal object present in the vicinity of the proximity switch device, and the receiver coils are arranged and configured such that, with an undisturbed magnetic stray field, voltages induced by the magnetic stray field in the receiver coils are substantially equal; and a plurality of capacitors integrated on the common substrate, wherein the receiver coils are coupled with the capacitors to form LC oscillator circuits, each comprising an inductive element and a capacitive element.