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JPS5521628

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DESCRIPTION JPS5521628
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a top view and a side view of a composite
constituting the piezoelectric acoustic transducer in the conventional example, and FIG. Figure 3
shows impedance characteristics and sound pressure characteristics according to the frequency
of the same device, Figure 3 shows a top view and a side view showing an example of a
composite constituting the piezoelectric acoustic transducer according to the present invention,
Figure 4 Port B shows the impedance characteristics and sound pressure characteristics at the
frequency of the same device. 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Piezoelectric
vibrator · · · · · · metal plate.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a piezoelectric ceramic
imaging element and a metal plate are bonded and integrated to form a composite, and this
composite is electrically connected to cause bending and vibrating to generate a sound wave. It
relates to a converter. In the conventional piezoelectric acoustic transducer, as shown in FIG. 1b,
a composite is formed by bonding and integrating a piezoelectric ceramic vibrator 1 having a
perfect circular shape and a metallic plate 2 having a true circular shape as in the first
embodiment. 2) In the heating characteristics characteristic sound pressure characteristic
according to the frequency at the 2nd port, it has electrically single Al- 2 ···, '222 resonance
characteristic. SUMMARY OF THE INVENTION The present invention is intended to provide a
piezoelectric acoustic transducer having an electrical bimodal resonance characteristic with a
simple configuration. That is, according to the present invention, as shown in FIG. 3b, an elliptical
piezoelectric ceramic vibrator 3 and an elliptical metal plate 4 are bonded and integrated to form
a composite. When this composite is connected to an appropriate electric circuit and bent and
vibrated, bimodal resonance characteristics can be provided electrically as shown in FIG. As
described above, according to the present invention, it is possible to obtain a wide band sound
pressure frequency characteristic as compared with the sound pressure frequency characteristic
04-05-2019
1
of the conventional product by electrically providing bimodal resonance custom with a simple
configuration.
04-05-2019
2
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