Piezoelectric speaker

Details Piezoelectric speaker Piezoelectric speaker

H - Electricity

04

R

349/67.9

H04R 17/00 (2006.01) H04R 7/26 (2006.01)

Patent

CA 1124830

ABSTRACT OF THE DISCLOSURE A piezoelectric speaker having a flat and stable out- put 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 re- sonance 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 piezo- electric vibrator and the inner bottom surface of the housing.

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