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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric sounding body used for producing various alarm sounds. (Constitution of the prior
art and its problems) Conventionally, this type of piezoelectric sounding body is constructed as
shown in FIG. 1 and FIG. In the figure. A piezoelectric element 3 in which a thin piezoelectric
ceramic plate 1 is bonded to a thin metal plate 2 with an adhesive is housed and held in a case 4,
and lead wires 5a and 5b are soldered to the piezoelectric ceramic plate 1 and the metal plate 2,
respectively. It is possible to connect with the outside. In this configuration, the piezoelectric
speaker is the lead 5a. When an alternating current electrical signal 6 is externally applied
through 5b, a bending vibration as shown by a dotted line in FIG. 3 is generated. The vibration
corresponding to this bending vibration is transmitted through the air in case 4 and piezoelectric
element 3 of case 4 The surface in parallel with the vibration vibrates and sounds, but as shown
in the frequency characteristic of Fig. 4, there is a disadvantage that the sound generation unit 8
of unnecessary frequency is generated besides the sound generation unit 7 of the necessary
frequency The (Object of the Invention) An object of the present invention is to provide a
piezoelectric sounding body which solves the conventional drawbacks and improves the sound
quality. (Structure of the Invention) The piezoelectric speaker according to the present invention
is a case for holding a piezoelectric element in which a thin piezoelectric ceramic plate is bonded
to a thin metal plate, provided with reinforcing ribs on the surface parallel to the piezoelectric
element. . Furthermore, it is provided in the antinode portion of the vibration mode of the
reinforcing rib case. DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the
present invention will be described based on FIGS. 5 to 7. FIG. The parts of FIG. 5 and FIG. 6
which are the same as those of FIG. 1 will not be described. In FIGS. 5 and 6, 9 is the case of the
present invention, and 10 is a reinforcing rib for suppressing the vibration of the case 9 provided
in the case 9. By providing the reinforcing rib 10 in the case 9, the reinforcing rib lO provided on
the surface of the case 9 parallel to the piezoelectric element 3 causes the vibration
corresponding to the bending vibration of the piezoelectric element 3 to transmit the air in the
case 9. The vibration can be suppressed and, as is apparent from the frequency characteristics
shown in FIG. 7, the generation of unnecessary frequencies is significantly attenuated. Further,
by providing the reinforcing rib 10 on the antinode of the vibration of the case 9, the effect is
further enhanced. (Effects of the Invention) According to the present invention, by providing the
reinforcing rib in the case, the piezoelectric sounding body has the effect of eliminating sound
production due to unnecessary frequency and providing a good sound quality with no unpleasant
Brief description of the drawings
1 is a plan view of a conventional piezoelectric sounding body, FIG. 2 is the same cross-sectional
view, FIG. 3 is a cross-sectional view showing a vibration state when an alternating current signal
is applied to the conventional sounding body, and FIG. FIG. 5 is a cross-sectional view of a
piezoelectric sounding body according to an embodiment of the present invention, and FIG. 6 is a
plan view of the same case.
FIG. 7 is the same frequency characteristic diagram. DESCRIPTION OF SYMBOLS 1 ...
Piezoelectric ceramic board, 2 ... Metal plate, 3 ... Piezoelectric element, 4, 9 ... Case, 5a, 5b ...
Lead wire, 6 ... AC signal, 7 ... Sound generation part of required frequency, 8 ... Sound generation
part of unnecessary frequency, 10 ... Reinforcement rib. Patent Applicant Matsushita Electric
Industrial Co., Ltd. East 1 Fig. 3 Fig. 3 Number of waves (Hz) Fig. 7
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