Abstract: Device for detecting and synchronising the position of at least one first wheel (16) of a timepiece mechanism (1) for an electronic analogue watch, wherein this first wheel (16) extends in one plane, the detection and synchronisation device (30) comprises at least one light source (32) emitting a light beam (34) and at least one light detection system (36), and this detection and synchronisation device is characterised in that a first light-reflecting element (40) projects from one of the upper or lower surfaces of the first wheel (16) of the timepiece mechanism (1), wherein the light source (32) and the light detection system (36) are arranged so that in a determined position of the first wheel (16) of the timepiece mechanism (1), the light beam (34) emitted by the light source (32) is reflected by the first reflective element (40) in the direction of the light detection system (36).

Abstract: Sealed pushbutton for a wristwatch comprising a pushbutton head that is movable between a resting position and an active position, a first fixed conductive element and a second movable conductive element. It comprises an elastically deformable capsule that hermetically covers the first fixed conductor, wherein an upper surface of the capsule is in physical contact with a lower surface of the pushbutton head. The capsule can be located in a non-deformed position when the pushbutton head is in its resting position and in a deformed position when the pushbutton head is in its active position, and the first and second conductive elements form a capacitive or resistive switch device, wherein the switch is in open state when the pushbutton head is in its resting position and in closed state when the pushbutton head is in its active position.

Abstract: The autoregulating circuit regulates the oscillation frequency of an oscillating mechanical system, such as a balance having a balance spring. A piezoelectric element is mounted on the oscillating balance spring to generate an alternating voltage and connected to the autoregulating circuit, which rectifies the alternating voltage and regulates the alternating voltage frequency. The rectified voltage is stored in a capacitor to power the autoregulating circuit. The autoregulating circuit includes an oscillator stage connected to a MEMS resonator for supplying a reference signal, a means for comparing the frequency of the alternating voltage to the reference signal frequency, and a frequency adaptation unit for supplying a frequency adaptation signal to the piezoelectric element according to the result from the comparison means, to regulate the oscillation frequency of the balance. The electronic components of the autoregulating circuit form a single electronic module.