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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view and a sectional view of the
present invention, FIG. 2 is an example of reproduction frequency characteristics of a single ringlike piezoelectric element, and FIG. 3 is a plurality of ring-like piezoelectric elements. It is a
reproduction frequency characteristic when it combines. 1, 1 ', ... are piezoelectric elements, 2.2',
... are horns.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a nondirectional speaker
in which a ring-shaped piezoelectric element is carefully combined and a horn is attached to each
to expand a reproduction band. Since the vibration mode of the ring-shaped piezoelectric element
is so-called radially expanding and contracting respiratory law vibration, its radiation directivity
characteristic is uniform in the horizontal force direction, that is, omnidirectional. However, the
reproduction frequency characteristic is narrow in band and can take at most one octave as
shown in FIG. This device is 7 * / 2 o1 / 2 concerning the collapse of the nondirectional speaker
which expanded the reproduction band paying attention to such a characteristic. That is, the ho 7
(2, 2 ',-) is attached to each of a plurality of ring-shaped piezoelectric elements 1.1' having
different diameters in FIG. 1, coaxially stacked, and an audio input voltage is applied to each of
them. Is pressurized, the small-diameter piezoelectric element 1 reproduces a high frequency
range, and the large-diameter piezoelectric element 1 'reproduces a low frequency range. Thus,
since each element is stacked coaxially, it becomes a so-called star-arranged one-note correction,
and the reproduction sound of each sound range is combined, and the reproduction sound range
is expanded like the 31st. Attach horns (2, 2 ') to each element to increase efficiency.
Furthermore, since it is ring-shaped, it is omnidirectional.
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