Asulab S.a.

Philippe Passeraub

Jean-Jacques Born

Pierre-Andr&eacute; Farine

Timepiece including a clockwork movement (,) provided with an analogue display (,). The wheel (,) includes a plate (,) with a toothing (,) defined by its external edge and a shaft (,). A device for detecting the angular position of the wheel (,) includes a magnetic or capacitive sensor (,) whose detection element, in particular a flat spiral coil (,), is used for detecting a variation in presence of the material, in particular a non magnetic conductive metal, forming the plate (,). The plate has at least one opening (,) situated in the intermediate region thereof between a central hole (,), and the tooth (,). The opening (,) defines a reference geometric semi-axis of the wheel (,) whose angular position is determined by the detection device provided.

Timepiece including a magnetic or capacitive device for detecting at least one reference angular position of a wheel of said timepiece

The microstructure includes an electronic circuit formed by a plurality of transistors (,) and a flat coil formed by a conductive wire or a conductive path (,). The coil (,) is arranged on an upper face (,) of the semiconductor substrate (,). The coil (,) generates a magnetic field (B) in this substrate (,) in the vicinity of the transistors (,) which are situated in superposition with said coil (,). The source (,) and the collector (,) of the sensitive transistors (,) are aligned along a direction perpendicular to the wire or path (,) in the portion of the coil situated in proximity to each of said transistors (,). Thus, the electric current (I) flowing in the transistors (,) is substantially parallel to the magnetic field (B).

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Oberrief, Switzerland

Philippe Passeraub