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JPH10285681

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH10285681
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flextensional type underwater transducer, and more particularly to a structure for maintaining a
desired function of a drive element supported in a shell.
[0002]
2. Description of the Related Art FIG. 4 is a sectional view showing the structure of a
conventional underwater transducer of this type, and FIG. 5 is an enlarged view of a portion A in
FIG. In the figure, 1 is a drive element, 2 is a rod provided at both ends of the drive element, 3 is
a disc-like piston portion provided on each rod 2, and 4 is a plate thickness of the piston portion
3 It is an open hole in the
[0003]
Reference numeral 5 denotes a shell having an elliptical cross-sectional shape, and a rod
insertion portion and a fluid filling portion 6 orthogonal to the rod insertion portion are formed
in the thickness of both ends of the shell 5 in the longitudinal direction. The drive element 1 is
supported inside the shell 5 by inserting the rod 2 of 1 into the rod insertion portion and
accommodating the piston portion 3 provided on the rod 2 in the fluid filling portion 6 There is.
[0004]
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The rod insertion portion is formed to have a length such that a gap 7 is formed between the end
face of the rod 2 and the shell 1 when the rod 2 is inserted.
8 is a fluid such as oil which is defoamed and filled in the fluid filling portion 6, 9a and 9b are Orings mounted on the outer periphery of the rod 2, and the O-rings 9a and 9b are the rod 2 and
the shell 5 The fluid 7 of the fluid filling portion 6 is sealed by being interposed therebetween.
[0005]
In the case of using the underwater transducer with such a configuration as, for example, a
flextensional sound source (transmitter), the drive element 1 generates a driving force indicated
by an arrow by energization, and expansion and contraction in the long axis direction by this
driving force The displacement is converted into a bending displacement of the latitudinal
surface of the elliptical shell 5 and transmitted. Further, this underwater transmitter-receiver can
be coupled to the drive element 1 and the shell 5 so that the stress is not applied to the drive
element 1 even if the shell 5 is deformed in the long axis direction by water pressure. And the
through holes 4 provided in the piston portion 3 housed in the fluid filling portion 6, so that the
rigidity impedance of the fluid 8 is increased when the drive element 1 vibrates dynamically. The
drive is transmitted to the shell 5.
[0006]
As a result, stable performance can be exhibited even if the depth of use changes, and in
particular, as shown in the drawing, the same coupling structure using fluid 8 is adopted at both
ends in the long axis direction of drive element 1. Therefore, more symmetrical vibration modes
can be obtained.
[0007]
However, in the above-mentioned prior art, there is a certain gap between the end face of the
drive element 1 and the inner surface of the shell 5, and the fluid 8 is made to move around the
piston portion 3. Due to the provision of the through hole 4 and the fact that the rod insertion
portion is formed such that the gap 7 is interposed between the tip of the rod 2 and the shell 5,
the drive element 1 is statically extended in the long axis direction. Since it is in an environment
where it can move freely, when its position is moved by its own weight of the drive element 1
etc., the side where the drive element 1 contacts the shell 5 and the side where it does not
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contact can be made. There is a problem that the vibrational symmetry of is lost.
[0008]
In fact, since the O-rings 9a and 9b are interposed between the rod 2 and the shell 5 to seal the
fluid 8, the drive element 1 can be easily moved by the friction due to the O-rings 9a and 9b.
Although it is not, for the long-term phenomenon, there is no guarantee that the movement of
the drive element 1 can be prevented, and a countermeasure is required.
SUMMARY OF THE INVENTION It is therefore an object of the present invention to realize an
underwater transducer capable of always guaranteeing the vibration symmetry by minimizing
the movement of the drive element due to its own weight.
[0009]
Therefore, according to the present invention, a rod is provided at both ends in the longitudinal
direction of the drive element by arranging the drive element in a shell having an elliptical crosssectional shape. The piston is provided on the outer periphery of the rod in a fluid-filled portion
provided in the shell so as to be inserted into a rod insertion portion provided at both ends in the
longitudinal direction, and the fluid In the underwater transducer in which the filling portion is
filled with a fluid, an elastic body having a stiffness smaller than the stiffness of the drive element
is provided in the gap between the end face in the long axis direction of the drive element and
the inner surface of the shell. It features.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the underwater
transmitter-receiver according to the present invention will be described below with reference to
the drawings.
FIG. 1 is a sectional view of an essential part showing a first embodiment of the present
invention.
In the figure, 1 is a drive element, 2 is a rod provided at both ends of the drive element, 3 is a
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disc-like piston portion provided on each rod 2, and 4 is a plate thickness of the piston portion 3
A through hole 5 is a shell with an elliptical cross section, 6 is a fluid-filled portion, 7 is a gap
formed between the end face of the rod 2 and the shell 1, 8 is a fluid-filled portion 6 Fluid such
as oil that has been defoamed and filled, and 9a and 9b are O-rings mounted on the outer
periphery of the rod 2, which are the same components as the conventional ones, and are
configured similarly ing.
[0011]
In this configuration, that is, in the underwater transmitter-receiver having the structure shown
in FIG. 4 and FIG. 5, the present embodiment relates to the end face of the driving element 1
supported inside the shell 5 and the shell 5 The elastic body 10 is provided in the gap existing
between the inner surface and the inner surface. FIG. 2 is a cross-sectional view of a main part
showing a second embodiment of the present invention, which is, as described above, in the gap
between the end face in the long axis direction of the drive element 1 and the inner surface of
the shell 5 Instead of providing the elastic body 10, the elastic body 10 is provided in the gap 7
formed between the tip of the rod 2 and the shell 5.
[0012]
FIG. 3 is a sectional view of an essential part showing a third embodiment of the present
invention, which is a gap between the end face in the major axis direction of the drive element 1
and the inner surface of the shell 5, or Instead of providing the elastic body 10 in the gap 7
formed between the tip and the shell 5, the elastic body 10 is provided in the gap existing
between the piston portion 3 and the shell 5 in the fluid filling portion 6, Although elastic
members 10 are provided on both sides of the piston portion 3 in the drawing, they may be
provided on only one side.
[0013]
The elastic body 10 used in these embodiments uses one whose stiffness (elastic coefficient) in
the thickness direction (longitudinal direction of the drive shaft 1) is sufficiently smaller than the
stiffness of the drive element 1 and the shell 5 Do.
If this condition is satisfied, the elastic body 10 is rubber, metal spring, plate spring, or any
material regardless of the material, but in that case the stiffness does not change much. It is more
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desirable, therefore, to choose one with such stiffness.
[0014]
That is, in the range in which the drive element 1 tends to move in the long axis direction, the
material whose nonlinearity is remarkable such that the stiffness changes rapidly and the
stiffness can not be ignored with respect to the stiffness of the drive element 1 is excluded. . In
the case of using the underwater transducer with such a configuration as, for example, a flex
tensional sound source (transmitter), as in the conventional one, the drive element 1 generates a
driving force indicated by an arrow by energization, and this driving is performed. The expansion
/ contraction displacement in the long axis direction due to the force is converted into the
bending displacement of the surface in the latitudinal direction of the elliptical shell 5 and
transmitted.
[0015]
In the underwater transducer according to each of the above embodiments, as shown in FIG. 1,
the gap between the end face in the long axis direction of the drive element 1 and the inner
surface of the shell 5 as shown in FIG. The elastic body 10 is provided in the gap between the
end of the rod 2 and the shell 5 or in the gap between the piston portion 3 and the shell 5 in the
fluid filling portion 6 as shown in FIG. Even if the drive element 1 tries to move in the long axis
direction by its own weight of the drive element 1, the rod 2 and the piston portion 3, the
movement of the drive element 1 is minimized by the elastic body 10. Support position is
guaranteed.
[0016]
Further, even if a portion where the drive element 1 is coupled to the shell 5 through the elastic
body 10 is formed by the attachment of the elastic body 10 or the deformation of the shell 5
under water pressure, the elastic body 10 used here Since the stiffness of the drive element 1 is
sufficiently smaller than the stiffness of the drive element 1, the function of the drive element 1
is not affected.
Therefore, in each of the embodiments, the vibrational symmetry of the drive element 1 is not
lost, and a vibrational mode with good symmetry is always obtained.
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[0017]
Although the above-described embodiment is described for use as a transmitter, the receiver
receives a sound wave from the outside by the shell 5 and transmits the vibration to the drive
element to extract an electrical signal. Of course it can be used as well.
[0018]
As described above, according to the present invention, the drive element is disposed in the shell
having an elliptical cross section, and the rods provided at both ends in the longitudinal direction
of the drive element are the length of the shell. The piston is provided on the outer periphery of
the rod in a fluid filling portion provided in the shell so as to be inserted in a rod inserting
portion provided on both ends of the direction and orthogonal to the rod inserting portion, and
the fluid filling In the underwater transducer in which the fluid-filled portion is filled, the gap
between the end face in the long axis direction of the drive element and the inner surface of the
shell, the gap between the tip of the rod and the shell, or the fluid filling portion An elastic body
of stiffness smaller than the stiffness of the drive element is provided in a gap between the
housed piston portion and the shell.
[0019]
Therefore, even if the drive element tries to move in the long axis direction by the own weight of
the drive element, the rod and the piston, the movement of the drive element is minimized by the
elastic body, and the intended support position of the drive element is secured. Furthermore,
even if the drive element is coupled to the shell 5 through the elastic body due to the attachment
of the elastic body or the deformation of the shell under water pressure, the stiffness of the
elastic body is more than the stiffness of the drive element. Since the size is small, the function of
the drive element is not affected, so that the vibration symmetry of the drive element is not lost,
and it is possible to obtain an effect that a vibration mode with good symmetry is always
obtained.
[0020]
Brief description of the drawings
[0021]
1 is a cross-sectional view of the main part showing a first embodiment of the present invention.
[0022]
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2 is a cross-sectional view of the main part showing a second embodiment of the present
invention.
[0023]
3 is a cross-sectional view of the main part showing a third embodiment of the present invention.
[0024]
Fig. 4 is a cross sectional view showing the prior art.
[0025]
5 is an enlarged view of a portion A in FIG.
[0026]
Explanation of sign
[0027]
REFERENCE SIGNS LIST 1 drive element 2 rod 3 piston portion 4 through hole 5 shell 6 fluid
filling portion 7 gap 8 fluid 9 a, 9 b O ring 10 elastic body
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