Actuators with graded activity

Details Actuators with graded activity Actuators with graded activity

1994-12-23

1996-05-21

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

055192785

ABSTRACT:
A method for reducing and/or shifting stress in at least one outer end poon of an actuator made from a piezoelectric material. The actuator is affixed to a substrate by an adhesive bond and adapted to cycle between an expanded and contracted positions, which creates stresses in the actuator and in the bond. The method includes the step of doping at least one outer portion of the actuator with a metal oxide to reduce piezoelectric activity therein. In a preferred embodiment, the doped outer portion has a gradient composition varying from the maximum at the end of the actuator to essentially zero concentration at a point inward of the end. The system includes a doped piezoelectric actuator adhesively bonded to a substrate and electrodes attached to the actuator for receiving electrical energy, the actuator containing a metal oxide dopant in the outer portions thereof.

REFERENCES:
patent: 2841722 (1958-07-01), Gravley
patent: 2911370 (1959-11-01), Kulcsar
patent: 3947708 (1976-03-01), Fulenwider
patent: 4190785 (1980-02-01), Kompanek
patent: 4767732 (1988-08-01), Furukawa et al.
patent: 5038069 (1991-08-01), Lukasiewicz et al.
patent: 5139689 (1992-08-01), Kitoh et al.
patent: 5170089 (1992-12-01), Fulton

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