Resonator for a thermostatically-controlled oscillator having low power consumption and rapid heating

A piezoelectric resonator having a crystal with adherent or non-adherent electrodes, the resonator being of the type comprising a sealed box containing at least one piezoelectric crystal interposed between first and second electrodes that are connected respectively to first and second conductors extending outside the box, and fastening means for fastening the piezoelectric crystal inside the box, the piezoelectric crystal comprising a central portion and a peripheral portion forming a ring that surrounds the central portion at a distance therefrom and that is connected thereto by an intermediate portion that is narrow in the radial direction and in which a slot is formed, wherein the peripheral portion is connected to the central portion via a single connection bridge constituted by a non-slotted portion of said intermediate portion extending over a small fraction of the periphery of said intermediate portion, and wherein the central portion constitutes the active vibration portion of the crystal while the peripheral portion is secured in the box by the fastening means which is disposed in such a manner as to be thermally as remote as possible from the single connection bridge, said secured portion and said bridge constituting means for suspending the crystal.