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JPH0648297

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DESCRIPTION JPH0648297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater acoustic wave receiver, and more particularly to an underwater wave receiver having
a long opening and flexibility.
[0002]
2. Description of the Related Art FIG. 2 is a cross-sectional view showing a conventional long
aperture underwater wave receiver. In the figure, reference numerals 11a to 11d denote
piezoelectric vibrators as electroacoustic transducers. The piezoelectric vibrators 11a to 11d are
generally cylindrical piezoelectric vibrators made of piezoelectric ceramics, for example, PZT
(lead titanate / diethylgonate), are polarized in the thickness direction of the cylinder, and have
positive and negative electrodes on both sides of the cylinder. Is formed. 12 is a two-core
waterproof cable connected in parallel to the positive and negative electrodes of the piezoelectric
vibrators 11a to 11d, and 13 is a molded waterproof rubber to avoid exposure of the conductive
parts of the piezoelectric vibrators 11a to 11d and the waterproof cable 12 In an underwater
wave receiver with such a configuration, a sound wave coming from the outside transmits
through the waterproof rubber 13 and propagates to the piezoelectric vibrators 11a to 11d, and
a distortion proportional to the magnitude of the sound wave is generated in the piezoelectric
vibrator Do. Then, a charge proportional to the strain is generated in the electrodes of the
piezoelectric vibrator by the piezoelectric effect, so the voltage between the electrodes is
detected through the waterproof cable 12
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1
[0003]
However, in the underwater wave receiver of the above configuration, a cylindrical piezoelectric
vibrator made of piezoelectric ceramic is used, so that the opening of the wave receiving can be
regarded as continuous. However, since the piezoelectric vibrator is made to approach, there is a
problem that it is not flexible because of the fragility of the piezoelectric ceramic. On the other
hand, there is a problem that the continuity of the opening is lost if the distance between the
piezoelectric vibrators is increased to give flexibility. SUMMARY OF THE INVENTION The present
invention aims to provide an underwater receiver having a long opening and flexibility in order
to eliminate the above problems.
[0004]
SUMMARY OF THE INVENTION An underwater wave receiver according to the present invention
comprises a piezoelectric vibrator in which a piezoelectric polymer is formed into a spiral cable,
and a positive electrode and a negative electrode of the piezoelectric vibrator. The electric signal
transmission means and the molded waterproof rubber containing the piezoelectric vibrator and
the electric signal transmission means are provided.
[0005]
According to the present invention, since the underwater wave receiver is configured as
described above, it can have long opening and flexibility.
Therefore, the problem can be solved.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a view showing an
embodiment of the underwater wave receiver according to the present invention. In the figure,
reference numeral 21 denotes a cable-shaped piezoelectric vibrator using a piezoelectric polymer
as an electroacoustic transducer of the underwater wave receiver. Reference numeral 22 denotes
a two-core waterproof cable connected to the positive electrode and the negative electrode of the
piezoelectric vibrator 21 as electric signal detection means. 23 is a low hardness waterproof
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rubber molded into a cylindrical shape for waterproofing. The piezoelectric vibrator 21 has a
spiral shape in molding.
[0007]
FIG. 3 is a view showing a connection portion between the piezoelectric vibrator 21 and the
waterproof cable 22. As shown in FIG. In the figure, 31 is a piezoelectric polymer, generally PVDF
(polyvinylidene fluoride), P (VDF-TrFE) (vinylidene fluoride-trifluoroethylene copolymer), P
(VDCN-VAC) (vinylidene cyanide)・ A vinyl acetate copolymer etc. are known. Reference numeral
32 denotes a positive electrode of 1 mm in diameter formed by twisting a thin conductive wire,
and a piezoelectric polymer 31 is formed in a cylindrical shape coaxial with the positive electrode
32 with a thickness of 0.5 mm. Reference numeral 33 denotes a negative electrode, which covers
the piezoelectric polymer 31 with a thin knitted wire. A protective film 34 has a cable shape with
an outer diameter of 3 mm, and is a flexible piezoelectric vibrator as a whole. 35a, 35b lead wire
to connect to 2 core waterproof cable
[0008]
Next, according to the principle of operation of the underwater receiver according to the above
configuration, when a sound wave arrives, the sound wave passes through the waterproof rubber
23, propagates to the piezoelectric polymer 31, and the distortion is proportional to the
magnitude of the sound wave. Occur. Then, a charge proportional to the strain is generated at the
electrodes of the piezoelectric vibrator 21 by the piezoelectric effect, so that the voltage between
the electrodes is detected through the waterproof cable 22.
[0009]
In the above embodiments, although the case where the cross section of the waterproof rubber
mold is a circle has been described, the present invention is not limited to this, and in order to
give flexibility in one direction, the cross section is elliptical or rectangular. It is also possible to
Also, if the helical pitch of the piezoelectric vibrator is made dense, the receiving aperture can be
regarded as continuous. Furthermore, although the piezoelectric vibrator may be used in a
straight line instead of in a spiral shape, the capacitance of the piezoelectric vibrator can be
increased by using a spiral.
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[0010]
As described above in detail, according to the underwater wave receiver according to the present
invention, a piezoelectric vibrator in which a piezoelectric polymer is formed into a helical cable
shape is used as an electroacoustic transducer. Since it comprises, it is long opening and there is
an effect which can have flexibility.
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