Patent ID: 7768179

Claim:
A quartz crystal unit comprising a case having an interior space; and a quartz crystal resonator having a base portion and first and second vibrational arms connected to the base portion, the quartz crystal resonator being vibratable in a flexural mode, a capacitance ratio r 1 of a fundamental mode of vibration of the quartz crystal resonator being less than a capacitance ratio r 2 of a second overtone mode of vibration thereof; wherein at least one mounting arm protrudes from the base portion and extends in a common direction with at least one of the first and second vibrational arms, the at least one mounting arm being housed in the interior space of the case; wherein an electrode is disposed on a surface of the at least one mounting arm and a surface in the interior space of the case; and wherein the electrode disposed on the surface of the at least one mounting arm is connected to the electrode disposed on the surface in the interior space of the case.