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JPH0521594

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DESCRIPTION JPH0521594
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of an underwater wave receiver used in marine acoustic measurement equipment.
[0002]
2. Description of the Related Art FIG. 4 is a cross-sectional view of a conventional underwater
wave receiver, in which 1 is an electroacoustic transducer (hereinafter referred to as a
transducer), 2a and 2b are electrodes, 3 is a waterproof rubber, 4 Is a waterproof cable, 5 is a
lead wire. In the figure, the conversion element 1 is formed by forming a positive electrode 2a
and a negative electrode 2b on both sides of a film-like piezoelectric material such as
piezoelectric rubber in which particles of piezoelectric ceramic are mixed with piezoelectric
polymer or rubber. The waterproof rubber 3 is a rubber having a hardness of 50 to 70 degrees
molded in the conversion element 1 for waterproofing, and the waterproof cable 4 is for taking
out an electric signal generated between the positive and negative electrodes 2a and 2b of the
conversion element 1 Is
[0003]
According to the principle of operation of the wave receiver, when a sound pressure is applied to
the wave receiver, the sound pressure propagates through the waterproof rubber 3 and is
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applied to the conversion element 1, and a distortion proportional to the sound pressure is
generated in the piezoelectric material. Then, since a charge proportional to the strain is
generated in the film-like piezoelectric material by the piezoelectric effect, the potential
difference between the electrodes is detected through the waterproof cable 4 to obtain the sound
pressure.
[0004]
By the way, although the above-mentioned conventional underwater wave receiver can
sufficiently withstand normal use in water, the continuous use in a special environment, for
example, in water, and the temperature change is severe. The following problems occur with use
in places, etc. That is, when the underwater wave receiver is subjected to water pressure or
temperature change, the linear expansion coefficients of the conversion element 1 and the
waterproof rubber 3 are different, distortion occurs in the bonding interface between the two,
and there is a possibility of peeling between the two. In addition, depending on the type of
waterproof rubber covering the conversion element, hydrolysis may occur or moisture
permeability may cause a decrease in adhesion or a decrease in insulation.
[0005]
The present invention has been made to solve the above-mentioned problems of the conventional
apparatus, and aims to provide an underwater receiver which is resistant to environmental
changes and durable for long-term use.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, in the wave receiver
according to the present invention, the end face of the conductor on the positive and negative
electrode surfaces of the conversion element is removed to increase the extending surface
distance between the electrodes. After the surface of the conversion element has been treated
with moisture proofing, the conversion element and a part of the waterproof cable are integrally
covered with waterproof rubber
[0007]
[Operation] Since the underwater wave receiver is configured as described above, the
performance does not deteriorate even if it is used for a long time in water with severe
environmental changes.
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2
[0008]
FIG. 2 is a cross-sectional view of a wave receiver showing one embodiment of the present
invention, FIG. 1 is an enlarged cross-sectional view thereof, in which 1 to 5 are the same or
corresponding parts as the conventional device, and 10 is Base, 11 is a moisture-proof coating
[0009]
In the figure, the conversion element 1 is a film-like piezoelectric electron composed of a
piezoelectric polymer or a piezoelectric rubber obtained by mixing particles of piezoelectric
ceramic with rubber, and both sides of this conversion element 1 have conductivity. The
electrode is formed, and the electric signal generated between the both electrodes is taken out to
the outside through the lead wire 5 and the waterproof cable 4 as in the prior art.
[0010]
In the underwater wave receiver according to the present invention, as shown in FIG. 1, the end
faces of the positive and negative electrodes 2a and 2b of the conversion element 1 are removed
circumferentially to expose the base 6 having insulation properties. The extending surface
distance between the positive electrode 2a and the negative electrode 2b is increased.
A moisture-proof coating is formed on the entire surface of the conversion element 1 to prevent
the entry of water from the outside.
Next, after connecting the electrodes 2a and 2b of the conversion element 1 to the waterproof
cable 4 through the lead wires 5, the entire conversion element 1 is covered with the waterproof
rubber 3 to protect the conversion element 1 from external impact and maintain moisture
resistance. In addition, it prevents the deterioration of its electrical insulation.
As shown in FIG. 3, even if only one end face of the positive and negative electrodes is removed,
the influence on the performance can not be seen so much as long as the extended surface
distance can be secured.
[0011]
As described above, the spread surface distance between the positive and negative electrodes of
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the conversion element is enlarged, the adhesion between the electrode material and the film-like
piezoelectric material is made excellent by the moistureproof coating, and the conversion
element is waterproof rubber. (1) By covering the whole, a double and triple waterproof structure
is provided, which completely prevents moisture permeation from the outside and prevents the
insulation deterioration of the conversion element.
[0012]
Effect of the Invention In the underwater wave receiver, the spread surface distance between the
positive and negative electrodes of the conversion element is increased, and the adhesion
between the electrode material and the film-like piezoelectric material is achieved by the
moisture-proof coating. Further, since the entire conversion element 1 was covered with
waterproof rubber, the following excellent effects were obtained.
(1) The underwater receiver completely prevents moisture permeation from the outside by the
above configuration, and prevents the decrease in the electrical insulation of the conversion
element.
(2) As a result, it can withstand long-term use in water, and can be used stably even in a place
where temperature changes rapidly.
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