Patent ID: 6897743
Filing Date: 2005-05-24
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, and a groove having stepped portions formed in at least one of opposite main surfaces of each of the quartz crystal tuning fork tines; wherein a merit value M wherein a ratio of an absolute value of negative resistance −RL wherein an output signal of the quartz crystal oscillating circuit comprising the quartz crystal tuning fork resonator is a clock signal for operation of the electronic apparatus to display time information at the display portion, the clock signal having an oscillation frequency of the fundamental mode of vibration of the quartz crystal tuning fork resonator.