| 摘要 |
PROBLEM TO BE SOLVED: To provide a microfabricated tuning fork type bent crystal resonator which has high frequency stability at a fundamental mode vibration frequency, and is small in equivalent serial resistance R<SB>1</SB>and hjgh in quality coefficient Q factor, and also to provide a crystal unit with the crystal resonator, a crystal oscillator, and an information communication apparatus. SOLUTION: The tuning fork type bent crystal resonator comprises a tuning fork arm and a tuning fork base, grooves are provided on upper and lower surfaces of the tuning fork arm, electrodes are disposed in side surface portions of these grooves, and electrodes of a different polarity are disposed on a side surface of the tuning fork arm oppositely to said electrodes. In such a tuning fork type bent crystal resonator, the tuning fork base is connected to a frame via a connecting portion. Therefore, there can be realized a microfabricated tuning fork type bent crystal resonator of which the equivalent serial resistance R<SB>1</SB>is small and the quality coefficient Q factor is high. At the same time, the resonator is housed in the crystal unit, electrodes are disposed in grooves and on side surfaces so that the figure-of-merit of fundamental wave mode resonance becomes greater than the figure-of-merit of second-order higher harmonic wave mode resonance. In addition, from a relationship of an amplification rate and a feedback rate, the highly accurate crystal oscillator is provided whose output signal has an oscillation frequency of fundamental mode of vibration. COPYRIGHT: (C)2007,JPO&INPIT
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