Piezoelectric speaker

Details Piezoelectric speaker Piezoelectric speaker

1985-03-04

1986-06-03

Rubinson, Gene Z.

Electrical generator or motor structure

Dynamoelectric

Rotary

310324, 367157, 367165, H04R 1700

Patent

active

045931607

ABSTRACT:
A piezoelectric speaker comprises a piezoelectric vibrator (1) for vibrating in a bending mode, which is supported at its longitudinal intermediate position by a support member (6), whereby first and second portions (1a, 1b) of the piezoelectric vibrator (1) on both sides of the support member (6) are respectively supported in a cantilever manner. The piezoelectric vibrator (1) is connected at portions close to both ends thereof with a diaphragm (8) by coupling members (12) formed by wires, whereby bending vibration of the piezoelectric vibrator (1) is transferred to the diaphragm (8) thereby to drive the diaphragm (8). The position of the support member (6) with respect to the piezoelectric vibrator (1) is so selected that the resonance frequency of the first portion (1a) is smaller than the corresponding resonance frequency of the second portion (1b), and the primary resonance frequency (f1) of the second portion (1b) is so selected as to be substantially at the center value of the first resonance frequency F1) and the second resonance frequency (F2) of the first portion (1a) on logarithmic coordinates.

REFERENCES:
patent: 3761956 (1973-09-01), Takahashi et al.
patent: 4379211 (1983-04-01), Joscelyn et al.
patent: 4430529 (1984-02-01), Nakagawa et al.

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