Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-06-27
1984-12-18
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333155, H03H 925
Patent
active
044892500
ABSTRACT:
A surface acoustic wave device having a lithium tatraborate single crystal substrate is proposed. An electro-mechanical coupling coefficient K.sup.2 of the substrate is about 1% so as to obtain a surface acoustic wave having sufficient practical energy. When cut angles of the substrate and a propagation direction of the surface acoustic wave are expressed by Eulerian angles (90+.lambda., 90.degree., 90.degree.), a thickness t of an electrode formed on the substrate falls within a region bounded by a dotted curve and an alternate long and short dash curve in FIG. 8. The dotted curve and the alternate long and short dash curve indicate the experimental relationship between the cut angle .lambda. and the thickness t when the TCD is set at 5 and -5 ppm/.degree.C., respectively. When the film thickness t is set within the above-mentioned range, the absolute value of the TCD is set at 5 ppm/.degree.C. or less. When the cut angle .lambda. is 25.degree., the TCD of the substrate becomes zero. Therefore, using the substrate having the above cut angle, the TCD becomes zero or almost zero in the electrode region and nonelectrode region of the surface of the substrate.
REFERENCES:
Electronics Letters, 8th Jan. 1981, pp. 11-12, "Lithium Tetraborate; A New Temperature-Compensated SAW Substrate Material", R. W. Whatmore, N. M. Shorrocks, C. O'Hara, F. W. Ainger.
Proc. of the Ultrasonics Symposium IEEE 1981 Oct., pp. 337-34D, "Lithium Tetraborate-S New Temperature Compensated Piezoelectric Substrate Material for Surface Acoustic Wave Devices", N. M. Shorrocks, R. W. Whatmore, F. W. Ainger, I. M. Young, the symp. was held on Oct. 14-16, 1981.
Ebata Yasuo
Fukuta Katsuyoshi
Matsumura Sadao
Suzuki Hitoshi
Miller J. D.
Rebsch D. L.
Tokyo Shibaura Denki Kabushiki Kaisha
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