Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-01-15
1998-07-07
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310360, 310313R, H03H 972, H01L 4108
Patent
active
057774196
ABSTRACT:
A piezoelectric substrate (120) and a method for preparing same. The method includes steps of (i) providing a boule of piezoelectric material, (ii) orienting the boule to Euler angles chosen to provide a boundary condition matched to a partially-metallized surface and (iii) sawing the boule into at least a first slice (120) having first and second surfaces, at least one of the first and second surfaces comprising a planar surface. The method desirably but not essentially further includes steps of (iv) polishing at least one of the first and second surfaces to provide a substantially planar polished surface, (v) disposing a layer of metal on the at least one of the first and second surfaces and (vi) patterning the layer of metal to provide at least one interdigitated pattern (105, 110) comprising an acoustic wave transducer (105, 110), the acoustic wave transducer (105,110) providing the boundary condition matched to a partially-metallized surface.
REFERENCES:
patent: 3699364 (1972-10-01), Gerard
patent: 3725827 (1973-04-01), Slobodnik
patent: 3771072 (1973-11-01), Slobodnik
patent: 3867012 (1975-02-01), Phillips
patent: 3983515 (1976-09-01), Mitchell et al.
patent: 4001767 (1977-01-01), Slobodnik, Jr.
patent: 4159435 (1979-06-01), Lewis
patent: 4489250 (1984-12-01), Ebata et al.
patent: 4511817 (1985-04-01), Chai et al.
patent: 4523119 (1985-06-01), Whatmore
patent: 4525643 (1985-06-01), Chai et al.
patent: 4634913 (1987-01-01), Whatmore et al.
patent: 4670680 (1987-06-01), Andle
patent: 4672255 (1987-06-01), Suzuki et al.
patent: 4853019 (1989-08-01), Yamada et al.
patent: 4910839 (1990-03-01), Wright
patent: 5081389 (1992-01-01), Abbott et al.
patent: 5327626 (1994-07-01), Cho et al.
patent: 5434465 (1995-07-01), Sato et al.
patent: 5434466 (1995-07-01), Hickernell et al.
patent: 5705964 (1998-01-01), Tera et al.
"Propagation and Amplification of Rayleigh Waves and Piezoelectric Leaky Surface Waves in LiNbO.sub.3 " by Kazuhiko Yamanouchi and Kimio Shibayama, Research Institute of Electrical Communication, Tokoku University Sendai, Japan, (Aug. 1971).
An Article entitled "LiNbO Cuts for Filter Applications of 90.degree.-Reflected Leaky Elastic Waves" from 1994 Mahk Hayka/Interperiodica Publishing by A.I. Koslov.
An Article entitled "Substrate thickness dependence of SH wave propagation characteristics in rotated Y-cut X-propagation LiNb0.sub.3 " from 1986 Acoustical Society of America, Jan. 1986.
Hickernell, et al., The Surface Acoustic Wave Propagation Characteristics . . . , IEEE, pp. 1-4, Nov. 8, 1995.
Dougherty Thomas M.
Mancini Brian M.
Motorola Inc.
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