Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2005-06-07
2005-06-07
Lee, Benny (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C310S370000, C310S348000, C333S200000
Reexamination Certificate
active
06903618
ABSTRACT:
A quartz crystal unit has a quartz crystal tuning fork resonator capable of vibrating in a flexural mode of an inverse phase. The quartz crystal tuning fork resonator has a fundamental mode of vibration, a second overtone mode of vibration, a quartz crystal tuning fork base, and a plurality of quartz crystal tuning fork tines connected to the quartz crystal tuning fork base. A merit value M2for the second overtone mode of vibration of the quartz crystal tuning fork resonator is less than 30 so that the second overtone mode of vibration thereof is suppressed, the merit value M2being defined by a ratio Q2/r2, where Q2and r2represent a quality factor and a capacitance ratio of the second overtone mode of vibration, respectively, of the quartz crystal tuning fork resonator capable of vibrating in the second overtone mode.
REFERENCES:
patent: 3576453 (1971-04-01), Mason
patent: 4178566 (1979-12-01), Kawashima
patent: 4205248 (1980-05-01), Negita
patent: 4384232 (1983-05-01), Debely
patent: 6791243 (2004-09-01), Kawashima
patent: 2002/0125794 (2002-09-01), Tanaya et al.
Adams & Wilks
Chang Joseph
Lee Benny
Piedek Technical Laboratory
LandOfFree
Quartz crystal unit, and quartz crystal oscillator having... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quartz crystal unit, and quartz crystal oscillator having..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quartz crystal unit, and quartz crystal oscillator having... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3517015