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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
structure of a corrosion-resistant ultrasonic transducer, FIG. 2 is a cross-sectional view showing
one embodiment of the present invention, and FIG. 3 is a modified embodiment of the present
invention. 3a is a cross-sectional view, FIG. 3b is a side view of the same, and FIG. 4 is a crosssectional view for explaining the filling state of the insulating elastic material in the one shown in
FIG. DESCRIPTION OF SYMBOLS 1 ······ Disk-like electric element, 2 ··········· Column additional mass,
3 ·············································· Diaphragm, 5 ′ body . Fig. 1 Fig. 2-193-Japanese Utility Model
Application No. 5262083 (2) Fig. 3 ((1) (b) Fig. 4-194-
DETAILED DESCRIPTION OF THE INVENTION In the present invention, by attaching an
additional mass in one direction of an eight-plate electrostrictive element, thickness resonance
vibration of the electrostrictive element 1-. Also regarding O, the purpose is to provide an
ultrasonic wave ammo that is equipped with an explosion-proof function. Figure 1 is a crosssectional view showing a conventional structure of an ultrasonic transducer having a corrosionresistant tube, in which 1 is a nine-disc-like electrostrictive element having electrodes formed on
both sides, and this disc-like electrostrictive element 1 is a disc JIB-body A # 'i, and the part of
the node in the vibration is accommodated and supported in the housing 5 through the single ear
frame 4 and is borne. In this case, the above-mentioned casing 5 is constituted by two cylindrical
members 51.52), and a hole 51 & for drawing out the lead 7 to the lead wire in the
electrostrictive element 1 is bored in the member 5 chant Further, in the member 5211 of
remorse, a hole 52 & is formed for exposing the sound wave from the vibrating body A. The
peripheral edge portion of the diaphragm, which is fixed by the cylindrical member 51.52, is
fixed, and the cylindrical member 51.520 is S * or screw-fastened. Reference numeral 3 denotes
an insulating elastic material which is filled in the casing 5 so as to cover the vibrating body A,
and for example, a polyurethane polyurethane is used. According to the above-described
conventional structure, although the braking effect and the corrosion resistance are improved,
the explosion proof is not taken into consideration. For example, when an explosion occurs in the
door converter condensed to the cylindrical member 51 or the like The pressure # 1 lllk body
AKm 9 9, jt Lk yo Jlll-body A may jump out of the housing 50 hole 52 & from the 萌 i gang, and Ij
is dangerous and it is dangerous. The main body plan, providing an ultrasonic transducer of the
explosion-proof construction l which does not cause the above-mentioned danger, the place
where it is taken as 041 黴 is an integral part of the periphery II K II of the sound emission hole
of the case 5 There is a stopper means to prevent that is located on the other side. The following
F present invention l! Light up. Figure 1111 is an 11I plan view showing an example of the
present invention, the vibration body A even if the pressure of @ D1 of the vibration unit is larger
than the diameter Dffi of the housing sO sound section 52 and the pressure in the arrow P
direction. Is designed to prevent it from jumping out. 113 ■ 紘 考 変 変 変 変 T 膳 T T T T T T T
図 纂 纂 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 筐 体 筐 体 筐 体 筐 体 周 縁 周 縁 t Many central
origin 52bt-屡 成, 05 05! ! Jll152bを! 111 #, AO is a round stopper as a stopper for
preventing AO jumping out.
In this case, @ D3 of the peripheral portion after the notch is made larger than the diameter D1
of the vibrating body A. According to this, in the factory in which the viscous insulating elastic
material is filled in the housing 5, the air in the housing 5 is released from the notch portion, and
the filling of the insulating elastic material can be surely achieved. That is, since the thickness of
the insulating elastic material covering the sound wave emitting end of vibration integrated A
relates to the attenuation of the sound wave, if possible, the corrosion resistance function of the
II body A should be reduced directly so as to reduce its thickness & 14, If you try to make the
thickness smaller and make the gap between the ridge and the edge of the sound wave outlet
smaller, the green is filled with the ^ -insulation elastic material of the device, and the above
interval is the Ma elastic material. May be When the gap is closed, the case 5 yen O air does not
pass through, so that the filling of the insulating elastic material is not reliably achieved, and the
filling state as indicated by the filling state 紘 纂 4- There is a drawback that it is limited to
crawling the end. To solve this problem (as shown in 11311, it may be a structure having a Kll
defect. The filling operation is surely achieved by coming out of the air line cut portion in the
housing, and the filling operation also becomes a sinter because there is no need to use much
care for the injection amount at the time of filling. According to the above, an ultrasonic mparticle provided with an explosion-proof function can be obtained without losing the
conventional corrosion resistance, and the effect is extremely large in terms of safety.