Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-03-11
1994-04-12
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, H01L 4108
Patent
active
053028775
ABSTRACT:
A surface acoustic wave device comprises lithium tetraborate single crystal substrate to make use of surface acoustic waves with higher propagation velocities and smaller propagation losses, whereby frequencies to be signal-processed can be as high as above 1 GHz. The surface acoustic wave device comprises a metal film formed on a surface of a lithium tetraborate single crystal substrate, the metal film being for exciting, receiving, reflecting and/or propagating surface acoustic waves, the metal film being so formed that a cut angle of the substrate, and a propagation direction of the surface acoustic waves are in an Eulerian angle representation of (39.degree.-51.degree., 66.degree.-114.degree., -20.degree.-20.degree.) and directions equivalent thereto. In this propagation direction few Rayleigh waves exit, and only surface acoustic waves of high propagation velocity are generated. Propagation losses can be eliminated.
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"Characteristics of Leaky Surface Waves Propagating on Li2B407", IEEE 1989 Ultrasonics Symposium, M. Murota, et al., pp. 291-294, 1989.
"Temperature Compensated Piezoelectric Lithium Tetraborate Crystal for High Frequency Surface Acoustic Wave and Bulk Wave Device Applications", IEEE 1985 Ultrasonics Symposium, 1985.
Abe Hidenori
Sato Takahiro
Budd Mark O.
Nikko Kyodo Co. Ltd.
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