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JPS57176799

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DESCRIPTION JPS57176799
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a piezoelectric diaphragm used
for a conventional piezoelectric speaker, FIG. 2 is a sound pressure frequency characteristic
diagram of a piezoelectric speaker using the same piezoelectric diaphragm, and FIG. FIG. 4 is a
top view showing one embodiment of the piezoelectric sounding body of the present invention,
FIG. 4 is the same cross sectional view, FIG. 5 is a top view of another embodiment, FIG. 6 is the
same cross sectional view, and FIG. It is a sound pressure frequency characteristic figure of a
body. 5 · · · Case · 6.7 · · · · · · · · · · · · · · · · · · · · · · · · elastic sheet, 9, 12 · · · · · · · · · · · · · · · · · · · · · · · · · ·
.... Piezoelectric diaphragm, 14 ..... Lead wire.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
sounding body using a piezoelectric vibrating plate in which a piezoelectric ceramic plate is
joined to an elastic thin plate, and it is intended to improve the sound pressure, flatten the
frequency characteristics and broaden the band. It is. In general, a piezoelectric diaphragm in
which a piezoelectric ceramic plate and an elastic thin plate are joined can generate bending
vibration and generate a sound by applying an alternating voltage to the electrodes on both sides
of the piezoelectric ceramic plate, and has been widely used as a piezoelectric buzzer ing.
However, this piezoelectric diaphragm can be used only for the alarming purpose of generating a
single sound, and the frequency of the generated sound is almost 2 KHz or more. On the other
hand, with the recent commercialization of speech synthesis and synthesis melodization by LSI, it
has become essential to obtain high sound pressure in a wide band. FIG. 1 shows a conventional
piezoelectric diaphragm. Reference numeral 1 denotes an elastic thin plate made of metal or the
like. A piezoelectric ceramic plate j3 provided with electrodes 2 on both sides is joined to one
side of the elastic thin plate 1, and lead wires 4 are drawn from the electrodes 2 of the
piezoelectric ceramic plate 3. ing. FIG. 2 is a sound pressure frequency characteristic diagram of
the piezoelectric sounding body constructed by incorporating this piezoelectric diaphragm in a
case or the like, and as apparent from FIG. 2, the sound pressure of 600 to 1300 Hz and 2000 to
02-05-2019
1
3000 Hz is insufficient doing. When the piezoelectric sounding body described above is used as a
sounding body for the above-mentioned voice synthesis and synthesis) and □ J melody, the
improvement of the sound pressure in the above-mentioned frequency band is a major issue. The
present invention is also a 16G3 which eliminates the above-mentioned conventional drawbacks.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3
to 7. First, the embodiment shown in FIGS. 3 and 4 will be described. Reference numeral 6 is a
case, and two openings 6 and 7 are provided on the upper surface of the case 6, and a step of the
one opening 6 is provided. A piezoelectric diaphragm 10 for low frequency is formed by bonding
a thin piezoelectric ceramic plate 9 having electrodes on both sides to an elastic thin plate 8 such
as metal, and the other open lower 0 step portion is an elastic thin plate 11 such as metal. A high
frequency piezoelectric vibration plate 13 in which thick thick piezoelectric ceramic plates 12
having electrodes provided on both sides thereof is joined to each other. In the figure, reference
numeral 14 denotes a lead wire drawn from each piezoelectric diaphragm 10.13. Further, in the
embodiment shown in FIGS. 5 and 6, the diameters of the two openings 6 and 7 on the upper
surface of the case 6 are made different, and the large diameter piezoelectric diaphragm 10 is γ
The piezoelectric vibration plate 13 of °° “# J'f1 !!: L, J °°” ° ′ ′ ′ ′ ′ ′ ′ ′ ′ ′
′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ ′ is used for the high frequency band. Furthermore, the
piezoelectric diaphragms with different thicknesses in this way.
Piezoelectric diaphragms having different diameters may be appropriately combined to form a
piezoelectric speaker, or three or more piezoelectric diaphragms may be incorporated. The
piezoelectric sounding body configured in this way can flatten the sound pressure frequency
characteristics and improve the sound pressure as shown in FIG. As described above, since the
piezoelectric sounding body of the present invention is configured by combining a plurality of
piezoelectric diaphragms having different thicknesses or different diameters of the piezoelectric
ceramic plate, the reproduction band is expanded and the sound pressure frequency
characteristic is flattened. Sound pressure can be improved, and melody and voice can be
generated, which is of great practical value.
02-05-2019
2
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