| 摘要 |
Slicon hairspring (100a) as a torque-restoring element for an oscillator for a mechanical timepiece and having an oscillator frequency, said torque restoring element comprising a spiral spring body (110a) having a number N turnings with an inner terminal end for engagement with a rotational inertial element via a collet, and an outer terminal end for engagement with a stationary cock element, and having a width (140a), a height (150a) and a total arc length; wherein the spiral spring body (110a) includes a core (180a) formed from mono-crystalline silicon wafer oriented along the crystallographic axis; and wherein the spiral spring body (110a) includes at least one peripheral coating (190a) of a material having a thermal elastic constant different from that of the core (180a) of the spiral spring body (110a) so as to maintain the oscillator frequency of an oscillator including the torque-restoring element substantially insensitive to variations of ambient temperature. |
