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JPS49140032

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DESCRIPTION JPS49140032
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a cutaway view of a piezoelectric sounding
device according to an embodiment of the present invention, and FIG. 2 is a characteristic
diagram of the same piezoelectric sounding device and a conventional piezoelectric sounding
device. . 1 иии Double E container, 5 иии
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
sounding device fVc using a piezoelectric element, and its object is to improve the sound
pressure level of this piezoelectric sounding device. Conventionally, a container for bonding the
piezoelectric element and the vibration 1 # i and storing the six composites is used as a
resonance box. For this reason, this container K is usually provided with nine holes on the upper
surface parallel to the bending direction of the complex, but in such a piezoelectric sounding
device, the sound pressure level can not be said to be sufficient. The present invention is made
based on the above points, and one embodiment will be described below with reference to the
attached drawings. 2) The 11-1 'pressure W element 2 and the metal plate 3 are bonded between
the first to perform a role of a resonance building in a restructured composite or a container for
storing the composite 1. In the surface perpendicular to the bending direction of the composite 1
housed in the container 4, there are also 91 and holes in the side surface 6 of the container WA4.
In the following case, when an output is applied from the oscillation circuit (not shown) to the
specific gravity element 2 of the composite 1 housed in the container 4, a contradiction occurs in
the pressure element 2, which is transmitted to the metal plate 3 In addition, the oscillation
circuit may be provided separately from the metal plate 31-, which is provided inside the
container 4, or outside. When the metal plate 3 starts to produce sound, it is l! ????? Play
the role of a resonant box. Comparing this condition with the conventional piezoelectric sounding
device, the difference in the characteristics as shown in FIG. 2 occurs. Here, a conventional
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piezoelectric sound generating device and one having no drilling container 4 (1) surface 6 VC
hole 6 are shown. Characteristic V in FIG. 2 is an EE piezoelectric sound generator. A point at a
distance of Om is taken as a sound pressure measurement point, and a characteristic is shown
when a voltage applied to the piezoelectric element 2Vc of the piezoelectric sounding device is
changed immediately. In FIG. 3, characteristic 1 of the piezoelectric sounding device of the
present invention and B show the evanescent curve of the conventional piezoelectric sounding
device. The horizontal axis represents applied voltage (DC, V) and the vertical axis represents
sound pressure level (dB). As apparent from FIG. 2, the sound pressure level of about 7 dB is
improved at the same applied voltage to the piezoelectric sounding apparatus P1 ? ? +
conventional piezoelectric sounding apparatus of the present invention. As is apparent from the
above embodiments, the present invention is a h-type piezoelectric container in which a hole is
drilled in a weir at a right angle to the bending direction of the composite, in a container
containing the complex. The sound pressure level of the sound generator can be improved.
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