Piezoelectric crystal resonator, piezoelectric crystal unit having the crystal resonator and electronic apparatus having the crystal resonator
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United States of America Patent
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Apr 29, 2008
Grant Date -
Jun 23, 2005
app pub date -
Dec 3, 2004
filing date -
Dec 17, 2003
priority date (Note) -
Expired
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Abstract
A piezoelectric crystal tuning fork resonator comprises a tuning fork base and a plurality of tuning fork tines connected to the tuning fork base, each of the tuning fork tines having opposite main surfaces and side surfaces, a groove having a plurality of stepped portions being formed in at least one of the opposite main surfaces of each of the tuning fork tines, a plurality of first electrodes being disposed on the stepped portions of the groove in at least one of the opposite main surfaces of each of the tuning fork tines, a plurality of second electrodes being disposed on the side surfaces of each of the tuning fork tines, the piezoelectric crystal tuning fork resonator comprising three electrode terminals and each of the three electrode terminals having a different electrical polarity.
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