Ultrasonic transducer employing piezoelectric polymeric material

Details Ultrasonic transducer employing piezoelectric polymeric material Ultrasonic transducer employing piezoelectric polymeric material

1984-10-19

1986-03-18

Budd, Mark O.

Electrical generator or motor structure

Piezoelectric polymers

526255, 361233, 310257, 310335, 29 2535, H01L 4108

Patent

active

045771324

ABSTRACT:
An ultrasonic transducer is disclosed which includes a vibrating element comprising a sheet of a piezoelectric polymeric material which consists essentially of a copolymer of about 65 to 82 mol percent of vinylidene fluoride and about 35 to 18 mol percent of ethylene trifluoride. The polymeric material is formed into a film of the desired thickness and then heated to a temperature greater than about the crystal phase transition temperature and less than about the melting-point temperature for a period of time of about ten minutes to about two hours to produce a heat-treated film. The heat-treated film is poled in an electrical field of from about 50 to about 1,500 kilovolts per centimeter to give the film a thickness extensional electromechanical coupling factor of at least 0.05 and preferably greater than 0.2.

REFERENCES:
patent: 4268653 (1981-05-01), Uchidoi et al.
patent: 4369391 (1983-01-01), Micheron
patent: 4403382 (1983-09-01), Facoetti et al.

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