Abstract: The micro-resonator comprises, cut from the same quartz crystal, a bar and a suspension frame means. The bar is cut in a substantially Z cut mode. The excitation electrodes are disposed on the sides of the bar. The length of the bar is substantially parallel to the Y axis.This produces a resonator which vibrates in a main mode of extension-compression, at from 0.5 MHz to 4 MHz.

Abstract: The invention relates to a piezo-electric crystal reasonator comprising a tuning fork having two tines, one on each side of an axis of symmetry, having in addition to the excitation electrodes formed on the tines, auxiliary electrodes comprising conductive coatings formed, with the same axis of symmetry, on the same crystal which interconnects the two tines and further relates to a method for making such tuning fork resonator including the detection of asymmetry by applying an excitation voltage to the excitation electrodes to cause the resonator to oscillate, and while it is oscillating, detecting a voltage appearing between the auxiliary electrodes to indicate asymmetrical oscillation of the tines.In addition to excitation electrodes (5, 6, 7) on the tines (2, 3) of the tuning fork, auxiliary conductive electrodes (17, 18, 19, 21) are formed on a part of the resonator which interconnects the two tines.