Patent ID: 8400049

Claim:
A tuning fork quartz crystal resonator, comprising: a base; a first resonating arm connecting to one side of the base, wherein the first resonating arm comprises a generally planar first main surface, a first side surface, a generally planar second main surface, and a second side surface adjacent to each other in sequence, at least one first groove is formed on the first main surface of the first resonating arm, and at least one second groove is formed on the second main surface of the first resonating arm; and a second resonating arm connecting to the same side of the base, wherein the second resonating arm comprises a generally planar third main surface, a third side surface, a generally planar fourth main surface, and a fourth side surface adjacent to each other in sequence, at least one third groove is formed on the third main surface of the second resonating arm, and at least one fourth groove is formed on the fourth main surface of the second resonating arm; wherein the first main surface and the third main surface are generally on a same plane, a metal film on the surface of the first groove, on the surface of the second groove, on the third side surface, and on the fourth side surface are electrically connected to form a first electrode, a metal film on the surface of the third groove, on the surface of the fourth groove, on the first side surface, and on the second side surface are electrically connected to form a second electrode, and the first electrode and the second electrode are of opposite polarities; and wherein numbers, widths, depths, and shapes of the first groove and the third groove are asymmetric to those of the second groove and the fourth groove.