Method for manufacturing quartz crystal unit and electronic...

Details Method for manufacturing quartz crystal unit and electronic... Method for manufacturing quartz crystal unit and electronic...

2005-12-13

2008-08-19

Kim, Paul D (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S025350, C029S609100, C216S013000, C216S080000, C216S097000, C310S319000, C310S370000, C331S158000, C331S176000

Reexamination Certificate

active

07412764

ABSTRACT:
In a method for manufacturing a quartz crystal unit, a quartz crystal tuning fork resonator is formed by etching a quartz crystal wafer to form a quartz crystal tuning fork base and first and second quartz crystal tuning fork tines connected to the quartz crystal tuning fork base. The quartz crystal tuning fork resonator has a piezoelectric constant e′12within a range of 0.12 C/m2to 0.19 C/m2in the absolute value to drive the quartz crystal tuning fork resonator. 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 disposed on the side surfaces of the first quartz crystal tuning fork tine have an electrical polarity opposite to an electrical polarity of the electrodes disposed on the side surfaces of the second quartz crystal tuning fork tine. The quartz crystal tuning fork resonator is mounted on a mounting portion of a case.

REFERENCES:
patent: 6898832 (2005-05-01), Kawashima
patent: 6903618 (2005-06-01), Kawashima
patent: 6915548 (2005-07-01), Kawashima
patent: 6959472 (2005-11-01), Kawashima
patent: 2003/0169118 (2003-09-01), Kawashima

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