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US 4,384,394 AGranted
Method of manufacturing a piezoelectric transducer device
AssigneeThomson-CSF
InventorsClaire Lemonon, Francois Micheron, Pierre Wang
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Abstract
The invention relates to devices using transducer elements comprising a film of piezoelectric polymer arranged between electrodes. The transducer element in accordance with the present invention is in the form of a thermoformed protuberance. These devices are used for detecting and generating elastic compression waves, for infrared radiation, and for storing electrical energy.
Claims8
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of:
- thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof;
- electrically biasing the strained wall by a field applied in a direction normal to said wall to produce piezoelectric properties;
- and
- placing electrodes along said strained wall to form a capacitor.
1 more element
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of:
- thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof by heating two liquids separated by said film to the softening temperature of said film and creating a pressure difference between said liquids;
- electrically biasing the strained wall by a field applied in a direction normal to said wall to preoduce piezoelectric properties by rendering said liquids electrically conductive to act as liquid electrodes;
- and
- placing electrodes along said strained wall to form a capacitor.
1 more element
Dependencies are inferred from the claim text.