Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1985-11-25
1988-05-31
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310346, 310353, 310365, 310369, H01L 4108
Patent
active
047483679
ABSTRACT:
A contact heater arrangement is disclosed for a piezoelectric effect crystal resonator. The piezoelectric effect crystal element may be an SC cut quartz crystal disc having electrodes affixed to one side thereof to generate a lateral field in the crystal disc. The contact heater element is applied to the side of the crystal element opposite the side on which the electrodes are affixed. The particular pattern of the heater leaves the center of the crystal element exposed for frequency adjustment purposes. Locating the heating element and electrodes on opposite sides of the crystal element generates a constant temperature which has been found effective to uniformly heat a piezoelectric effect crystal element, and with appropriate control circuitry, allows for temperature stabilization of the crystal element.
REFERENCES:
patent: 3165651 (1965-01-01), Bechmann
patent: 3201621 (1985-08-01), Milner
patent: 3202846 (1965-08-01), Ballato et al.
patent: 3431392 (1969-03-01), Garland et al.
patent: 3478573 (1969-11-01), King, Jr.
patent: 3715563 (1973-02-01), Bloch
patent: 3818254 (1974-06-01), Persson
patent: 4091303 (1978-05-01), Tadataka et al.
patent: 4518944 (1985-05-01), Faris
Lateral-Field Excitation of Quartz Plates, by E. R. Hatch et al., IEEE Ultrasonics Symposium, 1983.
Bloch Martin B.
Goldfrank Bruce
Budd Mark O.
Frequency Electronics, Inc.
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