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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2, and FIG. 3 are half sectional views of a
conventional wedge-cylindrical transducer, FIG. 3 is a sectional view when assembling a
conventional piezoelectric element group, and FIG. FIG. 6 is a half sectional view of a wedgeshaped cylindrical transducer according to the present invention, and FIG. 6 is a sectional view in
the case of assembling a piezoelectric element group according to the present invention. -1 ...
piezoelectric element, 2 ... shell, 3 ... flange (1), 4 ... flange (2), 5 ... ring 0, 6 ... por)-1? ... Cable, 8 ...
Lead wire (+), 8 '... Lead wire (-), 9 ... Press plate, 9' ... Press head, LO ... Presser plate with bolt, 11
... Natsuto. 3 years of age. 5 years of age
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elliptical-tube
bending transducer for transmitting and receiving sound waves in water as an electroacoustic
transducer. Heretofore, as shown in FIGS. 1 and 2, the piezoelectric element 1 bonded to each
other in the air chamber inside the elliptical cylinder 2 is bonded in the maximum direction of
the diameter of the circle as shown in FIGS. , The ends of the oval cylinder 2 are fitted with 7
o'clock 4.5 through 0 ring 5, 7? : 21117, -9, 56 The flanges 4 and 5 are fastened with a bolt 6
and the 0 ring 5 is crushed to maintain watertightness. Further, a lead wire 8.81 of ■ O of the
piezoelectric element 1 is drawn out from the cable 7 into water. Since this type of transducer is
used at a low frequency and a large output, it is necessary to apply a compressive force to the
piezoelectric element 1 in advance to prevent tensile stress during excitation from being applied
to the piezoelectric element 1 itself and the bonding portion. Further, both ends of the
piezoelectric element 1 need to be completely in close contact with the elliptic cylinder 2. As
shown in FIG. 3, the piezoelectric element 1 and the method of assembling in the elliptic cylinder
2 are adhered to each other in advance, and the elliptic cylinder 2 is crushed in the up and down
arrow direction by the press plate 9 and the press bed 9. Then, the piezoelectric element 1 group
is put in a place where the elliptic cylinder 2 spreads in the left and right direction, and the
pressure of the press is reduced to apply a □ compression stress. An adhesive is applied to both
ends of the piezoelectric element 10 and the elliptical cylinder 2. In the above-described
conventional method, due to the manufacturing tolerance of the elliptical cylinder 2, the material
and the variation of the piezoelectric element 1, the compression pressure to the piezoelectric
element 1 is not uniformly applied. In addition, a press is required, and a bonding operation is
also required during the press operation, and it is necessary to perform heterogeneous forestry
at the same work site. The object of the present invention is to provide a wedge-shaped
cylindrical transducer which eliminates the above-mentioned disadvantages of the prior art,
stabilizes the assembling quality of the elliptic cylinder 2 and the piezoelectric element 1 and
considers the efficiency of operation. The feature of this invention is that the presser plate 10 is
adhered to both ends of the piezoelectric element 1 group without using a press, and the nut 11
is attached by turning the nut 11 by turning the nut 11 as a fulcrum And by applying a
compressive stress to the adhesive part, the adjustment of the nut 11 makes the quality uniform,
the press becomes unnecessary, and the work is made to be efficient. FIGS. 4, 95 and 6 show an
embodiment of the present invention. Zirconate bonded together in a plurality. The both ends of
the piezoelectric element 1 of lead titanate-based porcelain are electrically insulated at i 115 /
−1, and a bolted pressure plate 10 is adhered. Attach the nut 11 to this bolt part and put it in
the center of the metal oval cylinder 2.
The compression force applied to the piezoelectric element 1 and the adhesive is applied by
rotating the nut 11 with the inner wall of the elliptic cylinder as a stopper. As management for
generating uniform compressive stress, a strain gauge is attached to the piezoelectric element 1
or strain management is performed, or a method of measuring and managing capacitance of the
piezoelectric element 1 is employed. Further, the O-ring 5 is attached to the oval cylinder 2 and
the flange 3.4 is attached and fixed by the bolt 6. In operation, electric power is supplied from
the cable 7 to the piezoelectric element 1 through the lead wire 8.8 'and the electrostrictive
phenomenon of the piezoelectric element 1 causes mechanical vibration in the direction shown
by the arrow in FIG. ナツト11. The elliptical cylinder 2 is transmitted to the wedge cylinder 2
to expand and contract, and a sound wave is emitted into the water. Also, the sound wave from
the water generates an electric output to the cable 7 in the reverse path. According to the present
invention, it is possible to apply a compressive stress to the piezoelectric element 1 by rotating
the nut 10 in the elliptic cylinder 2 and to adjust the stress. The adjustment of the stress is also
performed by the piezoelectric element 1) It is only necessary to rotate and adjust the Natto 10
for management, which is extremely economical. In addition, uniform quality can be obtained,
and performance (/ tracking can be minimized.
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