Metal-electroactive ceramic composite actuators

Details Metal-electroactive ceramic composite actuators Metal-electroactive ceramic composite actuators

1992-02-12

1994-01-04

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367159, 367163, 310334, 310337, H04R 1700

Patent

active

052766578

ABSTRACT:
The metal-ceramic actuator includes an electroactive substrate having at least a pair of opposed planar surfaces and a determined thickness, with the ceramic substrate being poled in its thickness dimension. Conductive electrodes sandwich the ceramic substrate and are bonded to its planar surfaces. Metal caps, each having a concave cavity bounded by a rim, are bonded to both planar surfaces of the ceramic substrate. A potential is applied to the conductive electrodes to cause an expansion of the ceramic substrate in its thickness dimension and a concomitant contraction in its planar dimensions. The contraction creates a flexure of the metal caps, which flexures are used to actuate another instrumentality.

REFERENCES:
patent: 2912605 (1959-11-01), Tibbetts
patent: 3166730 (1965-01-01), Brown, Jr. et al.
patent: 3277433 (1966-10-01), Toulis
patent: 4845688 (1989-07-01), Butler
patent: 4862429 (1989-08-01), Rolt
patent: 4922470 (1990-05-01), McMahon et al.
patent: 4999819 (1991-03-01), Newnham et al.

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