Patent ID: 7170218
Filing Date: 2007-01-30
Classification: H03H

Abstract:
1. An electronic apparatus comprising: a display portion; and first and second quartz crystal oscillators comprised of first and second quartz crystal oscillating circuits each having a quartz crystal resonator, an amplifier, a plurality of resistors, and a plurality of capacitors, a mode of vibration of the quartz crystal resonator of the first quartz crystal oscillating circuit being different from that of the quartz crystal resonator of the second quartz crystal oscillating circuit; wherein the quartz crystal resonator of one of the first and second quartz crystal oscillating circuits comprises a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase and having a fundamental mode of vibration and a second overtone mode of vibration, the quartz crystal tuning fork resonator being electrically connected to an amplification circuit having an amplifier and a feedback resistor and to a plurality of capacitors and a drain resistor of a feedback circuit having the quartz crystal tuning fork resonator, and the quartz crystal tuning fork resonator having a quartz crystal tuning fork base, a plurality of quartz crystal tuning fork tines connected to the quartz crystal tuning fork base, the quartz crystal tuning fork tines having a first quartz crystal tuning fork tine and a second quartz crystal tuning fork tine, 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 at least one groove having stepped portions formed in at least one of the first and second main surfaces of each of the first and second quartz crystal tuning fork tines; wherein a merit value M wherein a ratio of an absolute value of negative resistance −RL