ELECTROMECHANICAL APPARATUS COMPRISING A DEVICE FOR CAPACITIVE DETECTION OF THE ANGULAR POSITION OF A MOVING ELEMENT, AND METHOD FOR DETECTING THE ANGULAR POSITION OF A MOVING ELEMENT

• Main Authors: LAGORGETTE, PASCAL, KLOPFENSTEIN, FRANÇOIS, SCHMUTZ, DAMIEN, HAENNI, RAPHÄEL, TARDIVON, MATTHIEU
• Format: Patent
• Language: English; French; German
• Published: 29.06.2016
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; ELECTROMECHANICAL CLOCKS OR WATCHES; HOROLOGY; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

Appareil électromécanique comportant un mobile et un organe indicateur analogique (14) solidaires en rotation, un moteur pas-à-pas, et un dispositif de détection capacitif (2) de la position angulaire du mobile, comprenant un rotor (4; 10), un stator (18a, 18b, 20a, 20b, 22, 24, 26a, 26b, 26c) et un circuit électronique de mesure (28), le stator comportant une première paire d'électrodes (18a, 18b) ayant une première capacité (C1) et une deuxième paire d'électrodes (20a, 20b) ayant une deuxième capacité (C2), le rotor étant conformé de manière à ce que les valeurs des deux capacités dépendent de la position angulaire du rotor, et un circuit électronique de mesure (28) étant prévu pour générer un signal de sortie représentatif d'une différence entre les valeurs respectives de la première (C1) et de la deuxième (C2) capacité. A timepiece includes a timepiece movement provided with an analog display and at least one wheel rotating integrally with a rotary indicator of the analog display. The wheel includes an electrically conductive plate pierced with at least one aperture. The timepiece also includes a device for detection of a reference angular position of the aperture. The detection device includes a first electrode, a second electrode, and a common electrode which are planar and arranged in a plane parallel to the wheel. The common electrode is arranged along portions of the first electrode and of the second electrode. The aperture is at least partially above or below: the first electrode in a first position of disequilibrium; the first electrode and the second electrode in a position of equilibrium; and the second electrode in a second position of disequilibrium.