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JPS54165179

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DESCRIPTION JPS54165179
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom view and a sectional view showing
the basic structure of a vibration system of a conventional piezoelectric sounding body, and FIG.
2 is a sectional view of the basic structure of a conventional piezoelectric sounding body Fig. 3 is
an operation principle of the piezoelectric sounding body vibration system fixed to the periphery,
Fig. 4 is a bottom view and a cross sectional view showing the basic structure of the vibration
system of the piezoelectric sounding body of the present invention. FIG. 6 is a cross-sectional
view showing an embodiment of the piezoelectric sounding body of the invention, and FIG. 6 is
an operation principle diagram of the piezoelectric sounding body vibration system fixed in the
center. 1 ииииии Piezoelectric porcelain, 1 ? ? ииииииииииииииииииииииии Metal diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention aims at providing a simple
piezoelectric sounding body with a mounting structure. A conventional piezoelectric sounding
body of this type has a disk-shaped piezoelectric ceramic 1 provided with an electrode 1 'as
shown in FIGS. 1 and 9 and FIG. It is configured by fixing the peripheral edge in the case 3. In the
piezoelectric sounding body having such a configuration, the sound pressure becomes unstable
unless the peripheral edge is fixed uniformly, the frequency component of the sound wave
becomes complicated, and there is a defect that causes so-called generation of a total sound
doing. If you want to fix the central part public gold to remove this gold-methods such as spot
welding can not be taken, it has to be by solder dab or -21 attachment or adhesive, the process
becomes complicated, there was a problem with productivity . The principle of operation of the
piezoelectric sounding body vibration system fixed to the periphery is shown in FIG. 3 and
represents a wavy line vibration mode. Further, in the figure, 3 is an opening portion of case 3, 3
and 3 are front space upper back space of case 3, 4 and 4 are lead wires, 5 is an input signal
source, and 6 and 6 'are fixed points. The present invention is intended to provide a complete
piezoelectric sounding body having a simple structure and high productivity, except for the
above-mentioned conventional drawbacks. An embodiment of the present invention is shown in
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FIGS. 4 and 6 and in FIG. The piezoelectric ceramic 1 has a hole 1 at its center, and in a state of
being bonded to the metal diaphragm 2, the metal diaphragm 2 is exposed at the portion of the
hole 1 ? ?. An electrode terminal 4 serving also as a fixing is attached to the center of the metal
diaphragm 2. FIG. 6 shows the operation principle of the piezoelectric sounding body vibration
system fixed in the center, and the broken line represents the vibration mode. "\" The electrode
terminal 4 "can be welded to the metal diaphragm 3" "by spot welding etc. The electrode terminal
4 can also serve as a fixed part, and the vibration system (piezoelectric ceramic) fixed at the
center A composite of 1 and the metal diaphragm 2 can be configured with high reliability and
high productivity. Further, the lead wire 4 is unnecessary and the structure is simple. 0 Further,
since the peripheral portion is not fixed, the back space 3 in the case 3 also becomes an effective
space to be generated as a breathing sound, and an effect of raising the sound pressure can be
obtained. As described above, the piezoelectric sounding body of the present invention can
constitute a piezoelectric sounding body having high reliability and high productivity with an
extremely simple structure, and its industrial value is extremely high. 0
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