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Original-Dokument Europäisches Patentamt

Method for working out the angular position of a rotating element and device for carrying out such a method | Verfahren zum Ausarbeiten der Winkelposition eines rotierenden Elements und Vorrichtung zur Durchführung solch eines Verfahrens | Procédé pour déterminer la position angulaire d'un élément rotatif et dispositif pour réaliser un tel procédé

Patentnummer:	EP2546612B1
IPC Hauptklasse:	G01D000528
Anmelder:
Erfinder:	MASA, Peter (0) Crêt du Jura 3, CH-2208 Les Hauts-Geneveys, CH
Anmeldung:	29.09.11
Offenlegung:	13.07.11
Patenterteilung:	14.11.18
Abstract / Hauptanspruch
The present invention concerns a method for working out the angular position of a rotating element which is mounted in a fixed frame, consisting in using at least one light source emitting a beam of light in the direction of a fixed sensor and using computing means for processing an output signal of the sensor, characterized in that it consists in: - a) arranging the light source with respect to the rotating element and of the sensor in a way so as to induce an interaction between the beam of light and the sensor which depends on the angular position of the rotating shaft, - b) arranging on the path of the beam of light, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, - c) detecting shadows generated by the mask on the sensor, - d) processing the output signal of the sensor for determining the position of the shadows on the sensor, - e) and computing the angular position of the rotating element by using the position of the shadows.