Method of making electromechanical transducers using improved fl

Details Method of making electromechanical transducers using improved fl Method of making electromechanical transducers using improved fl

1980-10-28

1983-10-04

Hall, Carl E.

Metal working

Piezoelectric device making

252 629, 310358, 310800, 310357, H01L 4122

Patent

active

044070543

ABSTRACT:
A method of making flexible composite piezoelectric materials exhibiting hydrostatic response and having a stable response over time is given. A prepolymer material is combined with a piezoelectric material and polarized by applying an electric field while inducing an electric dipole in the piezoelectric material, typically by applying hydrostatic pressure or changing the temperature. To ensure stable response characteristics, the polymer material is chosen to have a shear modulus of less than 20 pounds per square inch. To help ensure good contact between the piezoelectric material and the polymer material, controlled shrinkage may be induced in the composite materials by heat or the removal of a volatile material. The prepolymer material desirably has an electrical resistivity greater than 10.sup.10 ohm/meters. Typical piezoelectric materials include lithium sulfate and tartaric acid. Typical polymer materials include RTV rubber, urethanes, and polybutadienes, and may be in the form of oligomers.

REFERENCES:
patent: 2420864 (1947-05-01), Chilowsky
patent: 3070775 (1962-12-01), Andrews, Jr.
patent: 4128489 (1978-12-01), Seo
patent: 4227111 (1980-10-01), Cross et al.
"New Flexible Transducer Material . . . "; Electronics; 3-79; p. 57.
"Piezoelectric Properties . . . "; Furokawa et al.; Journal of Applied Physics; vol. 50, pp. 4904-4912; 1979.
"Piezoelectric Relaxation in Composite Epoxy-PZT System . . . "; Furokawa et al.; Japanese Journal of Applied Physics; vol. 16, pp. 453-458; Mar. 1977.

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