Quartz crystal unit, quartz crystal oscillator and...

Details Quartz crystal unit, quartz crystal oscillator and... Quartz crystal unit, quartz crystal oscillator and...

2011-05-17

2011-05-17

Banks, Derris H (Department: 3729)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S321000, C310S344000, C310S361000, C310S357000, C029S593000

Reexamination Certificate

active

07944131

ABSTRACT:
A quartz crystal unit comprises a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase and having at least one groove having at least one stepped portion formed in at least one of opposite main surfaces of each of first and second quartz crystal tuning fork tines. An electrode is disposed on the at least one stepped portion of the at least one groove so that the electrode of the first quartz crystal tuning fork tine has an electrical polarity opposite to an electrical polarity of the electrode of the second quartz crystal tuning fork tine. The quartz crystal unit comprising the quartz crystal tuning fork resonator has a capacitance ratio r1of a fundamental mode of vibration less than a capacitance ratio r2of a second overtone mode of vibration.

REFERENCES:
patent: 6590315 (2003-07-01), Beaver
patent: 6707234 (2004-03-01), Kawashima

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