Dual frequency, dual mode quartz resonator

Details Dual frequency, dual mode quartz resonator Dual frequency, dual mode quartz resonator

1985-02-04

1985-06-25

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310315, 310368, H01L 4108

Patent

active

045256470

ABSTRACT:
This invention is directed to an AT-cut quartz resonator having two different resonant modes simultaneously occurring in which a generally rectangular polyhedron has first and second electrodes disposed on opposing faces, and having the width to height selected within the range of 8 to 25. The width is selected such that a thickness shear mode and flexure mode are simultaneously excitable and coupled together. The AT rotation angle is selected so that a first signal responsive to the coupled flexure mode and thickness shear mode has a substantially cubic frequency versus temperature response over a desired temperature range and a second signal responsive to the coupled flexure and thickness shear modes has a substantially linear frequency versus temperature response over the desired temperature range. This invention also contemplates an apparatus for generating an output signal having a stable frequency versus temperature characteristic utilizing such a resonator and further contemplates a method for generating such a temperature compensated output signal.

REFERENCES:
patent: 3792294 (1974-02-01), Royer
patent: 3826931 (1974-07-01), Hammond
patent: 4039969 (1977-08-01), Martin
patent: 4071797 (1978-01-01), Zumsteg et al.
patent: 4076987 (1978-02-01), Zumsteg
patent: 4079280 (1978-03-01), Kusters et al.
patent: 4144747 (1979-03-01), Datwyler, Jr.
patent: 4160183 (1979-07-01), Kusters et al.
patent: 4320320 (1982-03-01), Momosaki et al.
R. D. Mindlin, "Third Overtone Quartz Resonator", 36th Annual Frequency Control Symposium, (Jun. 1982), 3-21.

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