Patent ID: 7564326

Claim:
An electronic apparatus comprising: at least one quartz crystal oscillator comprised of a quartz crystal oscillating circuit having a quartz crystal resonator, an amplifier, at least one resistor, and a plurality of capacitors; wherein the quartz crystal resonator comprises a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase, the quartz crystal tuning fork resonator having a quartz crystal tuning fork base, first and second quartz crystal tuning fork tines connected to the quartz crystal tuning fork base, each of the first and second quartz crystal tuning fork tines having a first main surface and a second main surface opposite the first main surface, and a first side surface and a second side surface opposite the first side surface, and at least one groove having a first stepped portion and a second stepped portion opposite the first stepped portion in the length direction formed in at least one of the first and second main surfaces of each of the first and second quartz crystal tuning fork tines; and wherein a length of the at least one groove formed in at least one of the first and second main surfaces of each of the first and second quartz crystal tuning fork tines is within a range of 20% to 78% of an overall length of the quartz crystal tuning fork resonator, the quartz crystal tuning fork resonator having a cutting angle of ZYw(0° to 10°) and a piezoelectric constant e 12 within a range of 0.095 C/m 2 to 0.19 C/m 2 in the absolute value.