Piezoelectric device with high, constant preload force

Details Piezoelectric device with high, constant preload force Piezoelectric device with high, constant preload force

1982-12-06

1984-07-17

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310329, 310328, H01L 4108

Patent

active

044608420

ABSTRACT:
A piezoelectric device, comprising a number of polarizable ceramic plates 1 which are stacked with intermediate metal plates which serve as electrodes. The stack is subjected to a large amount of preload by a preloading element having a relatively flat spring-force characteristic over the piezoelectric operating range of the device which is formed by a cylindrical housing having two sets of parallel pairs of slots 7, 10, rotationally displaced by 90 degrees, the preloading force being applied to the stack by threaded end plugs 4 and 5. The ceramic plates are polarized only after assembly and preloading.

REFERENCES:
patent: 3075099 (1963-01-01), Shoor
patent: 3145311 (1964-08-01), Dickey
patent: 3171989 (1965-03-01), Hatschek
patent: 3364368 (1968-01-01), Sonderegger
patent: 3482121 (1969-12-01), Hatschek

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