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US-Patent zur Kraftmessung mit Foliensensor

Das Patentamt der USA hat am 4. August 2022 das neue Patent US 2022/0240811 A1 offengelegt. Die Erfindung von Prof. Thomas Ertelt, André Kwiatek und Oliver Völckers beschreibt eine Membran, deren elektrischer Widerstand mit der an mehreren Stellen ausgeübten Kraft korrespondiert. Der Vorteil gegenüber älteren Sensortechnologien wie z.B. FSR (Force Sensing Resistors) liegt in einer angenähert linearen Kennlinie sowie einer verbesserten Stabilität.


Die Patentanmeldung basiert auf dem Europäischen Patent EP3965654A1 mit dem Prioritätsdatum 03.11.2021.


Abstract

The disclosure provides a sensor element (10) for detecting a force between a foot and a supporting surface. The sensor element (10) comprises a first layer (11) comprising an electrically non-conductive carrier foil (12) and a first semi-conductive layer (13) extending at least partially along a longitudinal direction of the first layer (11), a layer comprising a plurality of electrically conductive sections (19), at least one electrical connection area (17), and a second layer (14) comprising an electrically non-conductive carrier foil (15), and a second semi-conductive layer (16) extending at least partially along a longitudinal direction of the second layer (14), wherein at least one electrical connection area (17) is in contact with the one semi-conductive layer (13, 16) of the first and second layer (14) and being adapted to be connected to an electric energy source, and wherein the first semi-conductive layer (13) and the second semi-conductive layer (16) are arranged at a distance from one another and are adapted to selectively contact each other with a surface area that depends on the force applied to the sensor element (10), thereby changing a resistance value of the sensor element (10).


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