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JPS4867727

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DESCRIPTION JPS4867727
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional side view showing one embodiment
of the present invention, and FIG. 2 is a sectional side view showing another embodiment. In FIG.
1, 11a: vibration part, 12: piezoelectric X element, 16, 27, 19: packing, C: hollow part, 14: 14 · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Vibration part, 112 · · · piezoelectric
element, 11T · · · · · · packing ..... Kesumi -65- Utility Model 48-67727 (2 Mikoto 2 Figure -66-
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an
electroacoustic transducer for converting an electrical signal into sound waves or into sound
signals. To detect cars coming from car wash etc. It is desirable to use an air acoustic transducer
as the sensor. However, when an electroacoustic transducer is used in such a car wash, water
droplets and dust adhere to the piezoelectric element portion of the electroacoustic transducer,
so that the sound wave is greatly attenuated and the piezoelectric element is deteriorated. There
is. Therefore, it was considered to use an iK electro-acoustic transducer for water use (1) lfJ-R11
') 1-n2'-The electro-acoustic transducer for water uses piezoelectric elements, diaphragms, etc.
completely with rubber. It is molded to obtain water resistance. For this reason, the sound wave
propagation characteristics of rubber and water are almost the same for 6 use in water, but there
is no practical difference between using it in air, but when it is used in air, sound waves have
poor propagation characteristics in air and are absorbed by rubber Rounding and damping that
would otherwise be difficult to put to practical use. The present invention has been made in view
of the above circumstances, and its object is to obtain an electroacoustic transducer with low
attenuation of sound waves. Another object is to obtain an electro-acoustic transducer excellent
in water resistance and dust resistance. In order to achieve these objects, in the present
invention, a piezoelectric element is disposed on one surface of the diaphragm, and a hollow
portion is provided on the surface on which the piezoelectric element is disposed. Is
characterized by being exposed to the outside. Since the diaphragm is thus exposed to the air, the
vibration of the diaphragm directly vibrates the outside air, so that the attenuation of the sound
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wave is small. In addition, since the piezoelectric element is disposed in a sealed hollow portion,
the ratio (2) dQ-R77, 7-n'J 夛 i- '<, f, djf, and-□-are compared with those of a conventional
rubber-molded transducer. 28 □, i 'or the piezoelectric collector itself is not resistant to water
and dust. Hereinafter, an embodiment K of the present invention will be described with reference
to the drawings. In FIG. 1, reference numeral 12 denotes a piezoelectric element made of, for
example, barium titanate, which converts an electrical signal into mechanical strain, and
reference numeral 11 denotes a tip-like member. In particular, the bottom 11 & is a vibrating
portion. The piezoelectric element 12 is attached to the inner side surface 11b of the vibrating
portion 11M, and the outer side surface 110 is exposed to outside air. Then, when an electrical
signal is applied to the vibrating portion 11B and the piezoelectric element 12 ', the piezoelectric
element 2 causes mechanical distortion, which is transmitted to the vibrating portion 11a to
generate sound waves serving as rough points A and Bt-nodes. . The tip-shaped member 11 is
screwed to the support member 16 with a screw 22. 24 via a backing 27.
A resin 25 is filled in the gap between the tip-shaped member 11 and the support member 13 to
seal the hollow portion C together with the backing 27. A threaded groove is provided on the
outer periphery of the support member 13, and the threaded groove is formed with a horn 14.
The outer (L)---n-na case 15 is screwed on. Then, an O-ring 16 is provided on the joint surface
between the horn 14 and the outer case 15 to form a sealed structure. The horn 14 is for
improving the directivity of sound waves and is 6 inches. In particular, it has an effect when
using the electric-sound converter in the air. 17はリード#! It is a jacket cable which
communicates 20 · 23 to the outside. The opening of the cover Cape / L / 17 is sealed by
pressing the packing 19 by the packing retainer 18. The lead wire 26 of the piezoelectric
element 12 is soldered to the terminal 25 provided on the screw 24 together with the lead wire
23 to the outside. The terminal 25 is electrically isolated from the vibrating portion 11. In the
present embodiment, the terminal 25 is sandwiched by the cylindrical insulator 51. 32, and the
terminal 33 and the screw 24 are electrically insulated by the bushing 33. The other lead wire 20
is connected to the terminal 21 held by a screw 22. Thus, the lead wire 20 is pneumatically
connected to the vibrating portion 11 a via the screw 22. An embodiment of the pond according
to the invention will now be described with reference to FIG. (4) AQ-Q 77 ') 7-nt: The
piezoelectric element 112 is attached to the inner side surface ttti "of the vibrating portion 111,
and the 6 ° torsional vibration is integrated with the case 113 at * -7116 °, The outer side
surface 111b of the vibrating portion 1111 is exposed to the outside air. The piezoelectric
element 112 is electrically connected to the lead wire 118, and the vibrating portion 111 is
electrically connected to the case 113 and a support member 120 screwed to the inner side
surface of the case 113. Reference numeral 114 denotes a jacket cable of the lead wires 11B and
119. Reference numeral 117 denotes a packing for sealing the hollow portion C in which the
piezoelectric element 112 is disposed. Reference numeral 115 is a packin presser that holds the
packin 117. As described above, in the present invention, as described in the embodiment, the
piezoelectric element is disposed on the inner side surface of the diaphragm, and the portion
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where the piezoelectric element is disposed is a hollow portion surrounded by the diaphragm and
the other portion 1, eg, case 7 , This hollow part is sealed. And the outer surface of the
diaphragm is exposed to the outside air. For this reason, it is possible to obtain a 6 (5) A9-kai 11
') 1-nR 1-nR electro-acoustic transducer which is effective for detecting a car in a car wash or the
like without causing water droplets and dust to resist the piezoelectric element. it can.
Of course, the electroacoustic transducer according to the present invention is also suitable for
use in water.
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