Electroacoustic piezoelectric transducer having a broad operatin

Details Electroacoustic piezoelectric transducer having a broad operatin Electroacoustic piezoelectric transducer having a broad operatin

1989-09-25

1991-02-26

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

381173, 381202, 381204, 310324, 310332, H04R 1700, H01L 4100

Patent

active

049967134

ABSTRACT:
An electroacoustic piezoelectric transducer comprises a concave diaphragm and at least two planar bimorph elements having different respective resonance frequency characteristics coupled to the diaphragm. The bimorph elements may comprise larger and smaller bimorph elements providing frequency responses in lower and higher frequency ranges respectively, and are preferably directly connected to the inner concave surface of the diaphragm.

REFERENCES:
patent: 2242757 (1941-05-01), Romanow
patent: 2270167 (1942-01-01), Meissner et al.
patent: 3423543 (1969-01-01), Kompanek
patent: 3588381 (1971-06-01), Schafft
patent: 4283605 (1981-08-01), Nakajima
patent: 4401857 (1983-08-01), Morikawa
patent: 4845776 (1989-07-01), Bittencourt

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