Apparatus for increasing the recoverable energy of a piezoelectr

Details Apparatus for increasing the recoverable energy of a piezoelectr Apparatus for increasing the recoverable energy of a piezoelectr

1990-10-26

1991-11-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310330, H01L 4108

Patent

active

050685678

ABSTRACT:
A cantilever-mounted piezoelectric bender includes apparatus for forcing the bender to approach straightness when in a blocked position, e.g. when meeting a contact in an electrical relay. As a result, the potential energy recoverable from the bender is maximized without requiring additional piezoelectric material. A first preferred embodiment comprises a bender extension mounted on the free end of the bender. A normal load force is applied to the free end of the extension, rather than the free end of the bender, resulting in the application of a moment to the end of the bender which tends to straighten the bender when in a blocked position. A second preferred embodiment comprises a back-up plate disposed adjacent one surface of the bender. The degree to which the bender is straightened in a blocked position depends on the location of the point of tangency between the back-up plate and the extension.

REFERENCES:
patent: 2352311 (1944-06-01), Toro
patent: 3949247 (1976-04-01), Fenner et al.
patent: 4093883 (1978-06-01), Yamamoto
patent: 4492360 (1985-01-01), Lee et al.
patent: 4564851 (1986-01-01), Nilsson et al.
IBM Technical Disclosure Bulletin, Tapered Surface Piezo Actuator, by Smith, vol. 27, No. 6, Nov. 1984, p. 3568.

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