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Method-for-manufacturing-multi-layered-high-deformation-piezoelectric-actuators-and-sensors

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Method for manufacturing multi-layered high-deformation piezoelectric actuators and sensors

Details

Inventors: Face, Jr., Samuel A.; Clark, Stephen E.;
Assignee: Face International Corp. (Norfolk, VA)
Primary Examiner: Yao; Sam Chaun
Assistant Examiner:
Attorney, Agent or Firm:

A method and apparatus for manufacturing prestressed piezoelectric actuators which maximizes output, and increases the precision and efficiency with which the multi-layer actuators are made. Individual layers of the piezoelectric actuators are automatically stacked and registered with respect to each other within press members prior to bonding the layers to each other with a thermoplastic adhesive. Compressive force is applied while heat is conductively transferred from a heating element to the actuator in order to raise the temperature of each of the layers above the melting point of the thermoplastic. The temperature of the heating element is then decreased until the temperature of the actuator layers drops to below the melting point of the thermoplastic adhesive, thereby bonding the layers. Compressive force is then released, and the actuators are removed, further cooled and polarized. The temperature of the actuator may be sensed, and the pressure and the heat applied to the actuator varied in accordance with the sensed temperature.

DETAILED DESCRIPTION In view of the foregoing disadvantages inherent in the known methods and devices for manufacturing pre-stressed piezoelectric actuators now present in the prior art, the present invention provides a method and apparatus for manufacturing pre-stressed piezoelectric actuators which maximizes output, and increases the precision and efficiency with which the actuators are made relative to the prior art.
Accordingly, it is a primary object of the present invention to provide a method of the character described for manufacturing piezoelectric actuators which improves upon the prior art.
It is another object of the present invention to provide a manufacturing system which is automated.
It is an object of the present invention to provide a method of manufacturing multi-layer piezoelectric actuators.
It is another object of the present invention to provide a method of the character described in which individual layers of the piezoelectric actuators are automatically stacked and registered with respect to each other prior to bonding the layers to each other.
It is another object of the present invention to provide a method of the character described in which adjacent layers of the actuators are bonded to each other with a thermoplastic adhesive.
It is another object of the present invention to provide a method of the character described in which heat is conductively transferred from a heating element to each of the layers of the actuator in order to raise the temperature of each of the layers above the melting point of the thermoplastic.
It is another object of the present invention to provide a method of the character described in which the compressive force applied to the actuator by the heating element is sustained until the temperature of the actuator layers drops to below the melting point of the thermoplastic adhesive.
It is another object of the present invention to provide a method of the character described in which the compressive force applied by the heating element to the actuator is sustained until the temperature of the actuator layers drops to below the melting point of the thermoplastic adhesive

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