Acoustic transducer and method of making the same

Details Acoustic transducer and method of making the same Acoustic transducer and method of making the same

1991-06-26

1992-08-25

Eldred, J. W.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367174, 310800, 310324, 381190, 29 2535, H04R 1700

Patent

active

051425106

ABSTRACT:
An acoustic transducer which can be made small in size, i.e., in width, length and thickness, so as to fit into a credit card size package. The transducer comprises a flat frame having an opening therethrough. A pair of diaphragms of a piezoelectric plastic material extend across the opening in the frame along opposite sides of the frame. The diaphragms are stretched in at least one direction and are bonded to the frame under tension in the direction of the stretch. The diaphragms are bonded together at a position within the opening in the frame. The diaphragms are coated in both surfaces with conductive metal films. The inner metal films on the diaphragms which are opposed to each other are electrically connected together and the outer metal films are electrically connected together.

REFERENCES:
patent: 3973150 (1976-08-01), Tamura et al.
patent: 4295010 (1981-10-01), Murphy
patent: 4469920 (1984-09-01), Murphy
patent: 4517665 (1985-05-01), DeReggi et al.

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