Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2008-02-14
2010-12-07
Kim, Paul D (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S609100, C029S831000, C029S834000, C029S835000, C216S013000, C216S080000, C216S097000, C310S319000, C310S370000, C331S158000, C331S176000
Reexamination Certificate
active
07845063
ABSTRACT:
A method for manufacturing a quartz crystal unit comprises forming a quartz crystal tuning fork resonator that is capable of vibrating in a flexural mode of an inverse phase and that has a quartz crystal tuning fork base, and first and second quartz crystal tuning fork tines connected to the quartz crystal tuning fork base. An electrode is disposed on each of two of side surfaces of each of the first and second quartz crystal tuning fork tines so that the electrodes of the first quartz crystal tuning fork tine have an electrical polarity opposite to an electrical polarity of the electrodes of the second quartz crystal tuning fork tine, a motional capacitance C1of a fundamental mode of vibration of the quartz crystal tuning fork resonator being greater than a motional capacitance C2of a second overtone mode of vibration thereof.
REFERENCES:
patent: 6898832 (2005-05-01), Kawashima
patent: 6915548 (2005-07-01), Kawashima
patent: 6959472 (2005-11-01), Kawashima
Adams & Wilks
Kim Paul D
Piedek Technical Laboratory
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