Patent ID: 7586303
Filing Date: 2009-09-08
Classification: H03K

Abstract:
1. Inductive proximity sensor comprising: an inductive coil defining a front working plane of the sensor, said front working plane forming an active surface or end of the sensor, said inductive coil being associated with a covering plate or a plane part of a housing of said sensor, said plate or part being made of a non magnetic metal with low electrical conductivity and said plate or part being disposed perpendicularly to an axis of the coil and parallel to the front working plane, and thus forming part of an equivalent magnetic circuit; means for supplying the coil repeatedly with current; means for processing signals which correspond to voltages induced in said coil when fed, said voltages being influenced by the presence of an object or body within a given detection area, depending on a distance of said object from the detection area and on a material constituting said object, and said coil being part of a parallel LC circuit; U U