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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing an embodiment
of the piezoelectric acoustic device of the present invention, and FIG. 2 is a sectional view
showing the piezoelectric acoustic device proposed above. 1 иии Electric element, 2 и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и electrical circuit, @, 6 / / / и и и иии и и Front, side, bottom plate of the case 6,
6a, 6b и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и transistor. Figure 1 Figure 2 2-175-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
acoustic device for use in a warning buzzer such as a fire alarm, an anti-theft device, a gas
detector, a general buzzer such as an intercom or a watch bell. As shown in the first figure, the
piezoelectric element 1 and the diaphragm c are integrated while bonding to shear the composite
S, and the composite 3 is supported by the projection l in the case 6 and stored. An electric
circuit provided inside the nurse 6 (1) or outside the case 6, connecting the piezoelectric element
11 of the composite 3 with the lead lll 3.3 'of the piezoelectric element 11 of the composite 3
and bending and vibrating this composite S k Thus, sound waves are generated. The inventor of
the present invention first provides openings Aa and Ab at the front surface 6 'and the side
surface 6' of the plus 6 respectively, and shadows the tube from the front surface 6 'of the case 6
toward the composite S in the case 1. It is proposed not to cause the sound wave to resonate in
the dark 9 to increase the angular sound volume. In this case, this mounting has a limit to
increase of the generated volume, and the maximum volume at / m ahead is about 976 B, and it
is very difficult to make it 100 dLB or more. This device is the above-mentioned electroacoustic
equipment! ???? And the volume of the generated sound can be increased in a dance-like
manner without increasing the size of the device, and it is an object of the present invention to
provide a compact and well-worked piezoelectric acoustic device. In order to achieve this, the
present invention is intended to construct the piezoelectric acoustic device in the construction
described in the section of claim 111 of the utility model registration. 11th! ! Id is an example of
the piezoelectric acoustic device according to the present invention. The composite element S,
the front surface 6 'and the ridge 1Ili 11 which integrally form the piezoelectric element 1 and
the IM movement #i by adhesion. In the case 1 having the opening 6a and the opening b,
respectively, the protrusion 16t is supported by the protrusion t to be stored on the front surface
1 'of the protrusion 16t. The bottom plate l ? side Kll! It is connected to a cold electrical circuit.
The electric circuit board is the printed circuit board 10, and the printed circuit board 10J: Kl!
And 211) composed of a resistor l / l) and the like. De is a cylinder formed facing the complex 3
from the front face 6 'of the case base. And, a horn-shaped tube 7 is formed on the outer
periphery of the side face 6 'of the case 6 @ horn-shaped @? A butterfly, its cast 7 ', is positioned
closer to the side * 4 # on the bottom plate 4 "@ than the opening Ab on the side 6' of the case
base, and horned like this end 7 ' Extend so as to spread out, bend from the position on the
extension line in the both end direction of the front face 6 'of the case 6 to the bottom 1M &' side
of the case 6, * Close connection, fI?
Provided integrally with the nurse 1. (3) Next,% is / Ill! The device of this invention I and the
device of FIG. 2 will be described by comparing the generated volume of the device of FIG. 2 with
a piezoelectric element of 0 diameter 35 and thickness a 3 and a phosphor bronze plate of
diameter sows and thickness 5aS. And a silver electrode are integrated to form a composite, and
this composite is used to form the piezoelectric acoustic device shown in FIGS. 1117 and 2 and
measure the volume of the front / m respectively. As a result, the applied voltage of one load
applied to the piezoelectric composite is that of koda vP-p, respectively, / 6! ????? It is 7
dB, and according to this device, the volume of jaB is not increased as compared with the device
of the first device. This volume increase is remarkable compared to the one of the opening 6b on
the side 6 '. As described above, according to the present invention, one end is positioned on the
outer periphery of the side of the case where the composite is accommodated, and one end is on
the bottom plate side from the opening of the side, and the tube expanding in a horn shape
toward the front of the case Since it is integrally provided, the opening on the side of the case is
resonated by this busy period, and the generated sound volume is dramatically increased. 0 As
the additional effect that the horn itself is easy to describe, it is industrial It is easy to handle on
the manufacturing side and in the case of practical use. In addition, there is also an advantage
that the terminal and attachment to the power supply, which is the horn itself, are a powerselling unit, so that they have the advantage of covering the screw and are also good in design.
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