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JPS55123999

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55123999
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
piezoelectric buzzer, FIG. 2 is a perspective view partially showing an embodiment of the
piezoelectric buzzer according to the present invention, and FIG. FIG. 1, IA и и и и и и и и и и и и и и и и 2 и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и board ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Closed space.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer using a piezoelectric vibrator. Piezoelectric buzzers are characterized by small size and
light weight without noise and are beginning to be used in various fields in place of conventional
electromagnetic buzzers. FIG. 1 shows an example of a conventional piezoelectric buzzer. In this
figure, a butterfly sound emission hole 2 is formed in the case 1, and the piezoelectric vibrator 3
is disposed at a position in the case 1 facing the sound emission hole 2. Further, in the case 1
(11ty, q ? / ff ? is provided with the substrate 4 on which the oscillation circuit is assembled,
and the case 1 is provided with the cover 5 at the opening) Only the piezoelectric vibrator 3
vibrates, the case l does not contribute to the tb torsional vibration, and the obtained sound
pressure is relatively small. SUMMARY OF THE INVENTION In view of the above-described
problems, the present invention is intended to provide a piezoelectric buzzer capable of
generating a large sound pressure by making a case incorporating a piezoelectric vibrator
actively contribute to vibration. Hereinafter, an embodiment of a piezoelectric buzzer according
to the present invention will be described with reference to the drawings. In FIG. 2 and FIG. 3,
two concentric circular arc-shaped sound output holes are formed on the upper surface of one
case, and the portion surrounded by these circular arc-shaped sound emission holes is the
vibrating portion 10 It becomes-. In addition, a cylindrical protrusion 11 is integrally formed on
the upper surface back side of the case IA, and the piezoelectric vibrator 3 is attached to the
cylindrical protrusion 11. Here, it is desirable that the thickness of the cylindrical protrusion 11
be as thin as possible, and the thickness of the cylindrical protrusion 11 is set to 1 .mu.m or less.
04-05-2019
1
The piezoelectric vibrator 3 is held at a node so as to be O. A sealed space 12 is formed by the
vibrating portion 10 of the case 1 ', the cylindrical projecting portion 11 and the piezoelectric
vibrator 3. Also, at the opening of the case 1, four substrates serving as a lid combined with an
oscillating circuit are attached, whereby the opening is closed. In the configuration of the above
embodiment, when the piezoelectric vibrator 3 vibrates, the sealed space 12 resonates and the
case IAO vibrating portion 10 also vibrates. Therefore, the buzzer sound of sufficiently thick
sound pressure is emitted forward of one case. According to the above-described embodiment,
the following effects can be achieved. (1) A cylindrical protrusion 11 is integrally formed on the
upper surface back side of one case, and the piezoelectric vibrator 3 is attached to the cylindrical
protrusion 11 so that a sealed space 12 is formed by the case IA and the piezoelectric vibrator 3
Therefore, a sufficiently large sound pressure can be obtained. (2) The substrate 4 on which the
oscillation circuit is assembled can be used as a lid, and the structure can be simplified.
(3) A space for resonance is provided separately from the enclosed space 12, and sufficient
sound pressure can be obtained without using the space (3). Therefore, the case IA can be
miniaturized. In addition, as a piezoelectric vibrator, it may be one in which a piezoelectric
ceramic is bonded to a vibrating plate or a structure in which two pieces of piezoelectric ceramic
are bonded. As described above, according to the present invention, the piezoelectric buzzer
incorporating the piezoelectric vibrator is positively contributed to the vibration to obtain the
piezoelectric buzzer capable of generating a large sound pressure.
04-05-2019
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