Patent ID: 7306364

Claim:
A timepiece having a case containing a mechanical watch movement driven by a spring and provided with a mechanical regulator, which is associated, via electromagnetic coupling, with an electronic regulator housed in the case, wherein said mechanical regulator includes a balance spring associated with a balance having a rotational axis and a rim provided with at least one pair of permanent magnets whose directions of magnetisation are substantially parallel to the rotational axis of the balance, but in opposite directions to each other, wherein said electronic regulator includes at least one fixed coil arranged for cooperating with said magnets via electromagnetic coupling, a rectifier powered by said coil and provided with at least one capacitor, and an enslaving circuit provided with an oscillator having a frequency and arranged for enslaving the frequency of the mechanical regulator to the frequency of the oscillator by means of said electromagnetic coupling, and wherein said electronic regulator is formed by a structural module that is entirely separate from the mechanical watch movement.