Piezoelectric speaker

Details Piezoelectric speaker Piezoelectric speaker

1979-04-02

1981-08-11

Canney, Vincent P.

H04R 1700

Patent

active

042836050

ABSTRACT:
A piezoelectric speaker having a flat and stable output vs. frequency characteristic attained by coupling a damping ring to an annular ring-shaped area surrounded by two nodal lines at the first overtone of a piezoelectric vibrator. The vibrator has concentric nodal lines at a resonance and vibrates in a planar bending vibration mode. The central part of a conical-shaped diaphragm is coupled to the piezoelectric vibrator and is accommodated in a housing. An acoustic resistive material is coupled between the piezoelectric vibrator and the inner bottom surface of the housing.

REFERENCES:
patent: 3548116 (1970-12-01), Schafft
patent: 3786202 (1974-01-01), Schafft
patent: 4078160 (1978-03-01), Bost

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