PIEZOELECTRIC VIBRATOR, PIEZOELECTRIC OSCILLATOR, AND PIEZOELECTRIC VIBRATOR MANUFACTURING METHOD
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United States of America Patent
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Issued Date -
Aug 3, 2023
app pub date -
Apr 11, 2023
filing date -
Dec 11, 2020
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Abstract
A quartz crystal resonator unit that includes: a piezoelectric blank; a first excitation electrode on a first principal surface and within at least a part of a vibration portion of the piezoelectric blank; a second excitation electrode on a second principal surface and within at least a part of the vibration portion of the piezoelectric blank; a first extended electrode on the first principal surface and electrically connected to the first excitation electrode; and a second extended electrode on the second principal surface and electrically connected to the second excitation electrode; and an insulation layer including a hollow portion which defines a space with the second excitation electrode. A thickness of the first extended electrode is larger than a thickness of the second extended electrode. An end portion of the first extended electrode extends over the hollow portion in a plan view of the piezoelectric vibrator.
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