Transparent flat panel piezoelectric speaker

Details Transparent flat panel piezoelectric speaker Transparent flat panel piezoelectric speaker

1980-06-02

1982-10-05

Stellar, George G.

Electrical generator or motor structure

Dynamoelectric

Rotary

310321, 310324, 368255, 455350, 455351, H04R 102, H04R 1700

Patent

active

043529615

ABSTRACT:
This invention intends to provide a speaker which assumes a comparatively large area in a device without spoiling various display effects. The transparent flat panel speaker of this invention is a speaker of high efficiency which can give forth a sound volume large considering the small-sized device even when driven by a low voltage.
The transparent flat panel speaker of this invention comprises, at least, a transparent resonator plate and a plate of a piezoelectric material held between at least one pair of electrodes, the resonator being excited by the piezoelectric material plate, a periphery of the resonator plate having a shape which is represented by a curve or in which straight lines are connected by smooth curves with at least two centers of curvature.
As the peripheral shapes, an ellipse, a curve expressed by X.sup.n /a+Y.sup.n /b=1, a plane figure obtained by molding the corners of a polygon circumscribed or inscribed to an ellipse, etc. are especially favorable for the speaker.

REFERENCES:
patent: 4048454 (1977-09-01), Barcus et al.

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