Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-10-28
1985-06-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310360, H01L 4108
Patent
active
045256438
ABSTRACT:
A piezoelectric wafer of single crystal berlinite, having a surface defined by an X-axis boule cut at an angle in the range from about 94.degree.-104.degree., provides an improved substrate for a surface acoustic wave device. These cut angles are relatively easy to fabricate, provide excellent temperature compensation in a range from -55.degree. C. to 125.degree. C., and have high piezoelectric coupling coefficient.
REFERENCES:
patent: 4109172 (1978-08-01), O'Connell
patent: 4109173 (1978-08-01), O'Connell
patent: 4382840 (1983-05-01), Chai et al.
IEEE Trans. Sonics and Ultrasonics, vol. SU-23, No. 2, (Mar. 1976), "Elastic Constants and Thermal Expansion of Berlinite"-Chang et al., pp. 127-135.
Acoustic Surface Waves, by G. S. Kino et al., Scientific American, Oct. 1972.
IEEE Trans. Sonics and Ultrasonics, vol. SU-23, No. 6, (Nov. 1977), "High Piezoelectric Coupling Temperature Compensated Cuts of Berlinite (AIPO.sub.4) for SAW Applications" O'Connell et al., pp. 376-384.
Ferroelectric, 1982, vol. 42, "Piezoelectric Crystals for Surface Acoustic Waves" Henaff et al., pp. 161-180.
J. Applied Physics, vol. 48, No. 3, (Mar. 1977), "Berlinite, a Temperature-Compensated Material for Surface Acoustic Wave Applications"-Jhunjhunwala et al., pp. 887-892.
Andle Jeffrey C.
Bailey Dana S.
Chai Bruce H.
Lee Donald L.
Vetelino John F.
Allied Corporation
Budd Mark O.
Fuchs Gerhard H,.
Riesenfeld James
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