Csem-centre Suisse D'electronique Et De Microtechnique

Cesm Centre Suisse D'electronique Et De Microtechnique Sa - Recherche Et

Johan Wilhelm Bergqvist

Jean-Marc Moret

Yves De Coulon

Herve De Lambilly

The present invention concerns the domain of inductive contactless sensors, allowing the position and/or the movement of a target sensitive to a magnetic field to be detected. The invention provides a miniature sensor comprising at least a primary coil generating an alternating magnetic field and at least two secondary coils for picked up such field, the coils being planar. The amplitude of the signal picked up by each coil is when the target passes in front of the coils, so that by measuring the signal amplitude or phase modulation, the speed and the direction of movement, or position of the object to be detected, is detected.

Device for detecting position and movement by using magnetic field

An integrated capacitive transducer (1) which includes a membrane having a movable part (4) with an electrode, a fixed plate (6) with a counter-electrode (8), and an electrode and counter-electrode support structure (10). The fixed plate (6) also has an electret (30) which is disposed facing the movable part (4), is separated from the membrane by an open space (16), and has a first electrically conductive layer (32) embedded in an insulating material (34, 36). The invention has particular applications in hearing aids.

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Bole, Switzerland

Johan Wilhelm Bergqvist