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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a piezoelectric alarm
according to the present invention, FIG. 1 is a plan view thereof, and FIG. 2 is a sectional view
taken along line A-A of FIG. FIG. 3 is a sectional view showing another embodiment of the present
invention. DESCRIPTION OF SYMBOLS 1 ... Piezoelectric vibrator, 2 ... Piezoelectric element, 3 ...
Metal plate, 4 ... Diaphragm, 5 ... Reflector, 8 ... Support body, 9 ... Support body.
[Detailed description of the invention] This invention is a piezoelectric alarm that generates a
sound by bending and vibrating a piezoelectric vibrator with an electric circuit, particularly a
loud sound such as the maximum sound pressure reaches 120.1 h at 1 m ahead The object of the
present invention is to provide a piezoelectric alarm having stable acoustic performance even at
high sound volume. The details will be described with reference to the drawings. In the figure,
reference numeral 1 denotes a composite type piezoelectric vibrator (hereinafter simply referred
to as a vibrator), and the vibrator l is a piezoelectric element 2 obtained by polarization treatment
of porcelain such as zircon and lead titanate in the thickness direction, and It consists of a metal
plate 3 for efficiently changing the radial expansion and contraction due to the strain effect to
bending vibration in the thickness direction, and a diaphragm 4 for sound pressure amplification,
and these are bonded with an adhesive via the metal plate 3. Integrated. In the electroacoustic
transducer having such a structure, the inserted metal plate 3 serves as a mechanical impedance
matching device, so that the relatively small piezoelectric element 2 can drive the large
diaphragm 4. The diaphragm 4 is drawn and curved in order to prevent the reduction of the
sound output due to the phenomenon of the jaw 9 in the peripheral portion. In this embodiment,
the curved shape is formed to be concave toward the front. Reference numeral 5 denotes a
reflector for sound (2) pressure amplification in which the vibrator l is disposed on the front
surface of the reflector 5. The reflector 5 has a recess in the center of the front surface, and an
electric circuit for driving the transducer l in the recess. After storing 6, it is closed so as to be
filled with the light-trapping agent 7. The shape may be a flat plate or a horn, but a shape similar
to that of the diaphragm 4 as shown in the drawing, that is, a curved shape in which the
peripheral portion is concave toward the front surface is preferable. Reference numeral 8 is a
support that couples the imaging mover 1 and the reflector 5 and is bonded to the node circle at
the time of resonance of the oscillator l. The piezoelectric alarm device configured as described
above emits a loud sound that reaches 120+ at a maximum sound pressure of 1 m ahead.
However, in order to support the joint circle of the vibrator l efficiently, that is, in order not to
prevent the vibration of the vibrator l, it is necessary to make the support area as small as
possible. In order to solve the contradiction that the support area should be taken as wide as
possible to prevent it, and also the position of the nodal circle and slight eclipse during assembly
do not have an acoustic effect on them, soft sponges etc. 3) using an elastic body, and the
diaphragm 4 has a large diameter in order to increase the reflection area as a vibrator, and
furthermore, the outer edge portion of the diaphragm 4 has an amplitude because it is not a
nodal circle of the vibrator l The oscillator l sometimes causes a moxibustion phenomenon due to
factors etc., and this may be continued to the generation of abnormal noise such as the decrease
of sound pressure or the generation of beats.
Therefore, in FIG. 1 and FIG. 2 which is one embodiment of the present invention, the outer edge
portion of the diaphragm 4 is fixed by the holding body 9 of the soft sponge body to such an
extent that the vibration of the vibrator l is not disturbed It was held elastically. In the present
embodiment, the outer edge is held at three points, but this is not limited to three points. FIG. 3
shows another embodiment of the holder, which is elastically held by a vinyl tape 9. As described
above, according to the present invention, the outer edge portion of the vibrator, that is, the
outer edge portion of the diaphragm is elastically held by the holding member to the extent that
the vibration of the vibrator is not disturbed so that the vibrator does not cause a lifting
phenomenon. Can provide a piezoelectric alarm that emits (4) a stable loud sound with acoustic
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