Ultrasonic transducer element

Details Ultrasonic transducer element Ultrasonic transducer element

1980-09-11

1983-07-26

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310800, 367150, H01L 4102

Patent

active

043956521

ABSTRACT:
An ultrasonic transducer element includes a polymer piezoelectric film having a plurality of sections. The sections are defined by wave planes of ultrasonic waves having substantially .lambda./2 phase difference emanated from an imaginary focal point or line located in front of the piezoelectric film. .lambda. is the wave length of the ultrasonic waves within an acoustic transmission medium located between the piezoelectric film and the imaginary focal point or line. The sections are arranged so that ultrasonic waves emanated from adjacent sections have substantially no phase difference at the imaginary focal point or line. Front and rear electrodes are deposited on opposite surfaces of the piezoelectric film.

REFERENCES:
patent: 2438936 (1948-04-01), Mason
patent: 2875355 (1959-02-01), Petermann
patent: 3390399 (1968-06-01), Leonard
patent: 3816774 (1974-06-01), Ohnuki et al.
patent: 4056742 (1977-11-01), Tibbetts
patent: 4084582 (1978-04-01), Nigam
patent: 4284921 (1981-08-01), Lemonon et al.

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