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JPS4890571

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DESCRIPTION JPS4890571
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the principle of
a piezoelectric sounding device, FIG. 2 is a cross-sectional view showing the principle of a
conventional device, and FIG. 3 is a cross-sectional view showing the principle of this device. FIG.
4 is a sectional view showing an embodiment of the present invention. 1 · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 7, 7 '· · · · · composite
Body 8, 8 '· · · · · · · · · · oscillation circuit, 9, 9 · · · · · · · · · 10, 11 · · · · · · · · · · · · · · · · · · · · · · · projection
. 2 section IP 179 1 real opening 48-90571 (2)-180-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
sounding device for use as an alarm buzzer such as a fire alarm, an antitheft device, a gas
detector, an interphone or a call buzzer of an electric telephone. As shown in FIG. 7, this
piezoelectric insulting apparatus # is made by attaching piezoelectric element + metal having a
silver electrode 3.3 ′ on the back side to metal + metal and two diaphragm l ′ 4tl II. A sound
unit is formed by connecting the diaphragm 11 silver electrode 3 of this complex with the
oscillation circuit AK by the lead wire S1y, and bending and vibrating the complex to generate a
sound wave. Conventionally, in the case of simultaneously using-or more complexes, as shown in
the first figure, the complexes 7.7 'are juxtaposed in the lateral direction (1) 4ε-90571-0211and oscillated respectively In the case where the circuits t and r and the power supply (de, de-KII
are connected in series, they are enclosed in a case), the entire apparatus becomes a large cover,
and the generated volume is lower than the applied voltage. The object of the present invention
is to solve the above-mentioned problems and to provide a piezoelectric type sounding apparatus
which is compact and has a large volume of generated sound. In order to achieve this purpose,
the present invention, as shown in FIG. 'Are arranged in an overlapping manner with an
appropriate interval, and the complex 7 and oscillators Z, C, and power! , R to simultaneously
vibrate. Fig. 3 shows the embodiment of this invention. 6 pieces of composite material are
supported by the protrusion 70 of the case 70, and an appropriate distance for overlapping with
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the composite material 7 Bond the composite de, which has been laid out by d, on the protrusion
of the case 70 circle fitted with the case IO, and this composite, 7 # is composite, space between
7 ' It is arranged in the unit and connected to the six oscillation circuits t and t ′ and the power
supplies t and t ′. In addition, the openings (A (· 4B-90571-03-st, ttoH) are respectively
provided with openings. Then, when power is supplied to the oscillation circuits 1 and 11 from
the power supply t, and the composites t and d are simultaneously bent and vibrated in the same
direction, the direction of the arrow m, B from each opening of the case IO and the front plate of
the case Sound waves are generated in the direction. The interval a between the complex 1 and 1
needs to be determined by the generation frequency, and when the generation local wave
number is, for example, about 17 KaX for two complexes, the generation volume in the A
direction or the B direction is maximized. The interval dFij2 should be equal to or less than this
interval. Ic1i, 龜 g, z ', power supply? , 9 'may be shared, and to reduce the whole reins by β; C.
Also, does the oscillator circuit x, z 'combine as shown? ', Between 1' g! , Case i in the inter part.
Or, if arranged in the case //, the entire device becomes smaller accordingly, but from the
characteristic orientation such as the generated fit, the case 10 or the case K // the external KW
7 is the same. Next, it collects about the result of comparing the generation volume of the
conventional equipment of FIG. (Y) a8-905V1-04 diameter 35 cabinet, QjM piezoelectric element,
a diaphragm made of phosphor plated copper plate of diameter SO2 and thickness QjM, and a
silver electrode to form a complex, When one composite is placed as shown in FIG. 3 and FIG. 3,
and the applied voltage at no load is 3p-pp, the volume at the position 111 (7 points) at the front
3 ° wound of the composite. (LB) is shown in the table below. Table 1 Ko ·, laO excitation
frequency wM #! I ′ ′ ′ 20 devices 0 device sound noble volume 鴫 遁 鴫 遁, t47 [11Z, 2AIKH
7'1g,? dBl 90 dB 14 cx 7 l λ 76 31 31? コ#1311ユクA114311gま#? As apparent
from the table of J # Y / 1'i, it is clear that the apparatus of the present invention has the
following features. や、よ、イ、□。:iffK! j then jllllii cysts increase. As described above,
according to the present invention, since the hood 7 is disposed in a state in which the shields 7
are overlapped at an appropriate interval, the vibration of the composites 7 and r is the sky r (1
"Because they are mutually intensified through the" 4B-90571-005 ", the volume of the
generated sound increases, and the entire apparatus can be made compact and compact. In
addition, if the overlapping condition of the complexes is half or more in area, this effect is not
impaired. Furthermore, the same effect can be obtained when the complex is other than a disc.
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