Piezoelectric crystal resonator, piezoelectric crystal unit...

Details Piezoelectric crystal resonator, piezoelectric crystal unit... Piezoelectric crystal resonator, piezoelectric crystal unit...

2008-04-29

2008-04-29

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07365478

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.

REFERENCES:
patent: 4178566 (1979-12-01), Kawashima
patent: 4384232 (1983-05-01), Debely
patent: 6587009 (2003-07-01), Kitamura et al.
patent: 6897737 (2005-05-01), Sakata et al.
patent: 2001/0004226 (2001-06-01), Piazza et al.

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