Piezoelectric and foam resin sheet speaker

Details Piezoelectric and foam resin sheet speaker Piezoelectric and foam resin sheet speaker

1987-06-17

1989-02-21

LaRoche, Eugene R.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

381158, 381 86, 381188, 381182, 310322, H04R 1700

Patent

active

048072940

ABSTRACT:
A sheet speaker comprised of a planar piezoelectric ceramic sheet encapsulated in a planar sheet of hard resin foam, comprised of a polystyrene, urethane, urea or phenolic. The planar piezoelectric ceramic sheet is centered in the planar hard resin from sheet which provides a surface area of 10-50 times the surface area of the planar piezoelectric sheet. The surface of the planar hard resin foam may be lined with cloth, paper, or plastic film.

REFERENCES:
patent: 1864615 (1932-06-01), Quinby
patent: 3573394 (1971-04-01), Birnbaum
patent: 3621155 (1971-11-01), Pruitt
patent: 3861495 (1975-01-01), Pearson
patent: 4079213 (1978-03-01), Bage et al.
patent: 4198550 (1980-04-01), Matsuda et al.
patent: 4240002 (1980-12-01), Tosi et al.
patent: 4295009 (1981-10-01), Weidler

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