Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-03-17
1984-12-04
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
044866828
ABSTRACT:
A new family of stress compensated quartz resonators having cuts exhibiting an ultra-linear frequency vs. temperature characteristic. This family of resonators has an orientation defined with respect to the crystallographic axes by polar angles .phi. and .theta., which angles lie on the locus where the second-order temperature coefficient of frequency is zero between the angles .phi.=20.degree..+-.2.degree. and .theta.=20.degree..+-.5.degree., and in close proximity to the locus of zero coefficient of stress. In one preferred embodiment, the resonator comprises a plate whose angles of cut .phi. and .theta. are both substantially equal to 20.degree.. In a second preferred embodiment an exact stress compensation is provided where .phi. is substantially equal to 20.8.degree. and .theta. is substantially equal to 23.2.degree., and orientation where the locus of the zero coefficient of stress intersects the locus of the zero of the second-order temperature coefficient.
REFERENCES:
patent: 4313071 (1982-01-01), Hermann
Handbook of Piezoelectric Crystals for Radio Equipment Designers, by Buchn, WADC Technical Report 54-248, Wright Air Developement Center, Dec. 1954, pp. 19 and 20.
Hewlett-Packard Journal, vol. 16, pp. 1-7, 1965, Hammond, et al.
Physical Acoustics, vol. 13, pp. 115-181, A. Ballato, 1977.
Proc. 35th Annual Frequency Control Symposium, B. Sinha, pp. 213-221, May, 1981.
Ballato Arthur
Lukaszek Theodore J.
Nakazawa Mitsuo
Budd Mark O.
Goldberg Edward
Lane Anthony T.
Murray Jeremiah G.
The United States of America as represented by the Secretary of
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