Quartz crystal unit, its manufacturing method and quartz crystal oscillator
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United States of America Patent
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Mar 16, 2004
Grant Date -
N/A
app pub date -
Nov 27, 2002
filing date -
Sep 19, 2002
priority date (Note) -
Expired
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Abstract
A quartz crystal unit, its manufacturing method and a quartz crystal oscillator are illustrated. In particular, the quartz crystal unit and the quartz crystal oscillator having a width-extensional mode quartz crystal resonator comprising a vibrational portion, connecting portions and supporting portions are illustrated with a cutting angle and electrode construction, which provides a high frequency and a high electro-mechanical transformation efficiency, even when the resonator is miniaturized. As a result of which the miniature quartz crystal unit and the quartz crystal oscillator may be provided with a zero temperature coefficient, a small series resistance R.sub.1 and a high quality factor Q. That is, these are accomplished by the cutting angle, the electrode construction and a large piezoelectric constant of the width-extensional mode quartz crystal resonator.
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