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JPH1141697

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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 JPH1141697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration transmitting and receiving apparatus and a vibration transmitting and receiving
method, and more particularly to an electroacoustic transducer, more specifically to vibration
transmitting and receiving used in water. BACKGROUND OF THE INVENTION 1. Field of the
Invention The present invention relates to a directional wave underwater wave transceiver used
in a wave device such as a sonar.
[0002]
2. Description of the Related Art Conventionally, in fields such as detection of underwater objects
and targets by sonars, survey of marine resources, survey of ocean currents, etc., low-frequency
ultrasonic waves have little propagation loss in water and are far It is used in that it has the
advantage of propagation. Also, from the viewpoint of formation of directivity in the case of
arraying transducers, a single sided radiation type flextensional transducer using a semi-elliptic
shell capable of radiating a sound wave only in one direction has been proposed. There is.
[0003]
FIG. 4A is a view showing the structure of a single-sided radiation type transmitter / receiver 1
generally used in the prior art, which is composed of a vibration drive source 2 and a
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semielliptical shell portion 3. In such a configuration, conventionally, the vibration drive source 2
is disposed in the long axis direction of the semielliptic shell portion 3 and one surface of the
semielliptic shell portion 3 in the minor axis direction is joined or integrated with the rigid body
4. It has a molded structure.
[0004]
As shown in FIG. 4 (B), when the vibration drive source 2 is driven, the surface 5 on one side in
the minor axis direction of the shell portion 3 is shown by a dotted line 6 by the displacement
enlarging mechanism by the shell portion 3. It vibrates greatly. On the other hand, since the
other surface in the minor axis direction of the shell portion 3 is restrained by the rigid body 4, it
can not generate vibration.
[0005]
Accordingly, the structure is such that the sound wave is emitted only from the one side portion
5 of the shell portion 3. Furthermore, in such a conventional vibration transmitting / receiving
apparatus, as shown in FIG. 4B, both ends of the shell portion 3 are completely fixed by the rigid
body 4, so that the vibration driving source 2 is provided. However, even if it is intended to
vibrate in the longitudinal direction, the displacement of the both ends is suppressed, so that the
vibration of the vibration drive source 2 generates a vibration as shown by the dotted line 7 in
FIG. 4 (B). As a result, since the vibration efficiency of the vibration drive source 2 is lowered, for
example, there is a problem that the electroacoustic conversion efficiency is lowered.
[0006]
Further, as another conventional example, in Japanese Patent Laid-Open No. 6-109832, there is a
transmission / reception wave adopting a method of vibrating the shell portion in a direction
perpendicular to the major axis direction of the semielliptical shell, that is, the minor axis
direction. The vessel is disclosed. Although the structure which provided two comparatively
compact vibration drive sources on left and right object centering on the minor axis diameter of a
shell part is shown, the number of such vibration drive sources increases simultaneously There is
also a problem that the vibro-acoustic emission surface is asymmetrical, and at the same time the
electro-acoustic conversion efficiency is lowered, it is impossible to reduce the weight and the
size.
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[0007]
Furthermore, Japanese Patent Application Laid-Open No. 4-334199 describes an underwater
ultrasonic transducer, and its characteristic feature is that the vibration drive source provided in
the semi-elliptic shell portion is made of a semi-elliptical shell using an appropriate bolt. A
construction is shown which is joined to the longitudinal end of the elliptical shell and has a
reinforcing effect against tension generated by water pressure. However, in such a configuration,
it is necessary to penetrate a long bolt in the axial direction of the vibration drive source, which
results in a complicated configuration and a high cost, and also causes problems such as a
change in resonant frequency. Become.
[0008]
That is, as a first problem in each of the above-described conventional examples, the vibration
drive source 2 can not be driven only in the longitudinal vibration state, and an extra vibration
mode can be obtained. As a result, the conversion efficiency of vibration decreases. The reason is
that in the conventional single-sided radiation type transducer, as shown in FIG. 4, the left and
right structures are asymmetrical as viewed from the major axis direction of the vibration drive
source, as shown in FIG. The vibration drive source is subjected to an asymmetric load.
[0009]
Therefore, in addition to the longitudinal vibration mode, a bending moment, a shear mode and
the like as shown by the broken line 7 in FIG. 4B are generated in the vibration drive source to
lower the efficiency. Also, even if the vibration drive source is made compact in order to reduce
the influence of the lateral vibration, the influence of the shear mode and the like can not be
eliminated, so that the efficiency also decreases. The second problem in the conventional
transducer is that the radiation efficiency of the sound wave is lower than that of the doublesided radiation transducer using the semi-elliptical shell.
[0010]
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The reason is that a double-sided radiation transducer emits sound waves from two surfaces in
the direction of the minor axis with the largest amount of displacement, while a single-sided
radiation transducer has a half-elliptical shell portion. Because the sound wave is emitted from
only one side in the minor axis direction, the acoustic load is only half applied, so the radiation
efficiency of the sound wave is poor. The object of the present invention is to improve the
drawbacks of the prior art described above, and to provide a vibration transmitting / receiving
apparatus having a simple configuration, high electroacoustic conversion efficiency, and high
directivity.
[0011]
SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present
invention adopts a technical configuration as described below. That is, according to a first aspect
of the present invention, there is provided a vibration transmitting / receiving device comprising
a hollow elliptical shell portion and a vibration driving source disposed inside the shell portion,
the length of the shell portion. A part of one end on the axial side is replaced with a rigid part,
and the vibration drive source is placed between the other end on the long axis side of the shell
and the rigid part, and the major axis of the ellipse and It is a vibration transmitting / receiving
device fixedly disposed so as to coincide with each other, and as a second aspect according to the
present invention, a hollow oval shell portion and a vibration driving source disposed inside the
shell portion In the vibration transmitting / receiving device constituted by the above, a part of
one end on the long axis direction side of the shell part is dropped and a rigid part is arranged on
the missing part, and the other side of the shell part on the long axis direction A vibration drive
source provided between the end of the body and the rigid portion in the longitudinal direction
of the vibration drive source By which only vibration, a vibration wave transceiver way you like
to send or receive a highly directional vibration wave.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION The vibration transmitting / receiving
apparatus according to the present invention 0 adopts the above-described technical
configuration, and hence the shape of the shell is symmetrical with respect to the long axis
direction of the shell. The driving force of the vibration drive source is equally transmitted to the
left and right of the shell portion, and only the longitudinal vibration is generated in the vibration
drive source.
[0013]
Further, in the vibration transmitting / receiving device according to the present invention, since
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the junction point with the rigid portion is set to coincide with the node portion related to the
vibration of the shell portion, the rigid body inhibits the vibration of the shell portion. Since the
shell can vibrate smoothly and sound waves are emitted from two surfaces in the minor axis
direction of the semi-elliptic shell having a large amount of displacement, the directivity is high
and the electroacoustic conversion efficiency is high. It becomes possible to obtain a vibration
transmitting and receiving device.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the
vibration transmitting and receiving apparatus according to the present invention will be
described in detail with reference to the drawings.
That is, FIG. 1 is a view showing the configuration of one specific example of the vibration
transmitting and receiving device 10 according to the present invention, and in the drawing, the
hollow oval shell 12 and the vibration disposed inside the shell 12 are shown. In the vibration
transmitting / receiving device 10 configured of the drive source 11, a part of the one end 21 on
the long axis direction side of the shell portion 12 is replaced with the rigid portion 13, and the
long axis direction of the shell portion 12 Between the other end 20 of the side and the rigid part
13, a vibration transmitting and receiving device 10 is shown in which the vibration driving
source 11 is fixed and disposed so as to coincide with the major axis of the ellipse.
[0015]
That is, in the present invention, it is desirable that the oval shape of the shell portion 12 is a
regular oval shape formed symmetrically in both the major axis direction and the minor axis
direction.
Further, the vibration drive source 11 according to the present invention is disposed in a line in
the longitudinal direction of the hollow elliptical shell portion 12 and is configured to be able to
vibrate only in the longitudinal direction. .
[0016]
A more detailed example of the vibration transmitting and receiving apparatus 10 according to
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the present invention will be described below. In FIG. 1, the vibration transmitting and receiving
apparatus 10 according to the present invention includes the vibration drive source 11 and the
semielliptical shell portion 12. One end 21 in the long axis direction is cut off by an appropriate
means, and a separately prepared vibration-proof rigid body 13 is attached thereto.
[0017]
The oval shell 12 used in the present invention is preferably made of the same metal material as
that used in the prior art.
Further, the vibration drive source 11 used in the present invention is not particularly limited,
but it is possible to use a piezoelectric vibrator element generally used conventionally, for
example, a piezoelectric element of ceramic type. desirable.
[0018]
The vibration transmitting and receiving device 10 according to the present invention can exhibit
excellent effects particularly when used in water, so that the elliptical shell portion is suitable to
use the vibration transmitting and receiving device 10 in water. At the same time as attaching
appropriate lids 14 to both side surface portions 12, a watertight container 15 and an
attachment fitting 16 to an appropriate casing or a bottom (not shown) or the like are provided
at the rear of the rigid body 13.
[0019]
Furthermore, in order to keep the lid portion 14 and the elliptical shell portion 12 in a watertight
state, it is also desirable to cover the lid portion 14 and the elliptical shell portion 12 with an
appropriate mold member 19.
In the above embodiment, the vibration drive source 11 is driven to vibrate by the electric energy
supplied from the watertight cable 18 electrically connected through the matching transformer
17 provided in the watertight container 15. It is configured to
[0020]
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Since the vibration drive source 11 in the specific example is arranged in the long axis direction
of the elliptical shell portion, the shell portion 12 is symmetrical with respect to the long axis
direction of the shell portion 12, Become. Further, it is desirable to select the shape, thickness,
and material of the shell portion 12 so that the junction between the elliptical shell portion 12
and the rigid body 13 in the present invention becomes the node portion of the shell portion 12.
[0021]
Then, since it is possible to use the surface in the minor axis direction of the elliptical shell
portion 12 as the acoustic radiation surface, the vibration transmitting / receiving device 10
according to the present invention has two acoustic radiation surfaces. With such a structure, as
a result, the pointing direction of the output of the ultrasonic wave of the vibration transmitting
and receiving device 10 coincides with the long axis direction of the shell portion 12.
[0022]
Further, in the present invention, the vibration drive source 11 is inserted into the inside of the
shell portion 12, and accordingly, the elastic drive force of the shell portion 12 positively applies
a compressive force to the vibration drive source 11. As a so-called prestress is applied, the
vibration direction of the vibration drive source 11 coincides with the long axis direction of the
shell portion 12 as shown in FIG. 4B. It is possible to completely prevent the generation of the
vibration in the direction perpendicular to the long axis direction of the vibration drive source
11.
[0023]
As described above, in the vibration transmitting and receiving device 10 according to the
present invention, as shown in FIG. 2, the hollow elliptical shell 12 exists on both sides in the
long axis direction and the short axis. The portions P1 and P2 bulging toward the direction side
are configured to function as an acoustic radiation surface.
Furthermore, in the vibration transmitting and receiving device 10 according to the present
invention, the rigid body portion 13 is formed by removing any part of one end of the shell
portion 12 in the long axis direction via an optional joining means. And the joint portion between
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the hollow oval shell portion 12 and the rigid body portion 13 corresponds to the vibration node
portion 23 of the hollow oval shell portion 12. It is
[0024]
Next, the operation of the vibration transmitting and receiving device 10 according to the present
invention will be described with reference to FIG. As shown in FIG. 2, when power is supplied to
the vibration drive source 11 of the vibration transmitting and receiving device 10 according to
the present invention, the vibration drive source 11 starts to vibrate, and the shell portion 12
shows a state shown by a broken line and a solid line. Causes a vibration between the condition
indicated by.
[0025]
At this time, since the joint portion 24 between the shell portion 12 and the rigid body 13 forms
a node portion 23, the rigid body 13 does not cause vibration and does not restrain the vibration
of the shell portion 12. Only the shell portion 12 can freely vibrate. Further, since the shape of
the shell portion 12 is symmetrical with respect to the long axis direction of the shell portion 12,
the driving force of the vibration drive source 11 is equally transmitted to the left and right of
the shell portion 12 to drive the vibration. Only the longitudinal vibration is generated in the
source 11.
[0026]
On the other hand, in the present invention, it becomes possible to emit sound waves from two
surfaces in the minor axis direction of the elliptical shell 12 having a large amount of
displacement. A more detailed example of the vibration transmitting and receiving device 10
according to the present invention will be described below. In FIG. 1, the vibration drive source
11 is formed by laminating a plurality of piezoelectric ceramics, and the elliptical shell portion 12
has a regular hollow oval shape and is made of an aluminum alloy. The one end in the major axis
direction of the elliptical shell 12 is cut off, and the block-like rigid body 13 is joined to the end
face of the shape cut off the end. .
[0027]
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Also, the cover 4 on both sides of the elliptical shell 12 and the watertight container 15 provided
behind the rigid body 13 and the fitting 16 for the appropriate case, and the vibration drive
source 11 and the watertight container are installed. A watertight cable 18 electrically connected
through the matching transformer 17 is used. Further, the elliptical shell portion 12 and the lid
portion 14 are molded with an appropriate material for watertightness.
[0028]
FIG. 3 is a view showing the configuration of another specific example of the vibration
transmitting and receiving device 10 according to the present invention, and the basic
configuration is substantially the same as that of FIG. The thin-walled portion 25 is configured so
as to reduce the thickness of the shell portion 12 at the joint portion 13. That is, as shown in FIG.
3, the vibration transmitting and receiving device 10 in this example is made of metal in which
one of the vibration driving source 11 and the major axis direction of the elliptical shape is
constituted by the rigid body 13 and the watertight container 15. It comprises an elliptical shell
portion 12 and a watertight cable 18 electrically connected to the vibration drive source 11 via a
matching transformer 7 installed in the watertight container.
[0029]
Furthermore, the entire vibration transmitting / receiving apparatus 11 is molded with an
appropriate material for watertightness. Next, in this specific example, the thickness of the joint
portion between the shell portion 12 and the rigid body 13 in the shape of the elliptical shell
portion is thinner than the thickness of the other portion. As a result, even if the length in the
long axis direction of the shell 12 is shortened, it is possible to set a node at the junction of the
shell 12 and the rigid body 13, so that the vibration transmitting / receiving apparatus The size
of the entire 10 can be miniaturized.
[0030]
As apparent from the above description, as the vibration transmitting / receiving method
according to the second aspect of the present invention, for example, the hollow elliptical shell
and the vibration driving source disposed inside the shell are described. In the vibration
transmitting / receiving apparatus configured as described above, a part of one end on the long
axis direction side of the shell part is dropped and a rigid part is disposed on the missing part,
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and the other part on the long axis direction side of the shell part A vibration transmitting /
receiving method in which a highly directional vibration wave is transmitted or received by
vibrating a vibration drive source provided between an end portion and the rigid portion only in
a longitudinal direction of the vibration drive source. is there.
[0031]
Furthermore, in the vibration transmitting and receiving method according to the present
invention, portions existing on both sides in the long axis direction in the hollow elliptical shell
and bulging toward the short axis direction are used as an acoustic emission surface. It is
desirable to be configured to function, and the joint portion between the hollow oval shell portion
and the rigid portion is configured to vibrate so as to correspond to the vibration node portion of
the hollow oval shell portion. It is also desirable to be configured in the same manner.
[0032]
The vibration transmitting / receiving apparatus and the vibration transmitting / receiving
method according to the present invention employ the above-described configuration. Therefore,
the first effect is to drive the vibration drive source only in the longitudinal vibration state. Since
this can be performed, it is possible to significantly improve the electroacoustic conversion
efficiency without generating an extra vibration mode.
[0033]
The reason is that the entire shape of the shell 12 is symmetrical with respect to the longitudinal
direction of the vibration drive source, so that the driving force of the vibration drive source is
uniformly transmitted to the left and right of the shell 12 to drive vibration. This is because the
source can be configured to generate only longitudinal vibration.
Further, in the present invention, it is possible to emit sound waves from two surfaces in the
minor axis direction of the elliptical shell portion having a large displacement generation amount.
[0034]
The second effect of the present invention is that the acoustic radiation area can be doubled as
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compared with the conventional vibration transmitting / receiving apparatus, so that the
radiation efficiency of the sound wave can be maintained high.
The reason is that since the shape of the shell 12 is symmetrical with respect to the direction of
the long axis of the shell, sound waves can be emitted from two surfaces in the direction of the
short axis with the largest amount of displacement.
[0035]
Brief description of the drawings
[0036]
1 is a perspective view for explaining the configuration of one specific example of the vibration
transmitting and receiving device according to the present invention.
[0037]
2 is a cross-sectional view for explaining an example of the operation in the vibration
transmitting and receiving device according to the present invention.
[0038]
FIG. 3 FIG. 3 is a cross-sectional view showing an example of the configuration of another specific
example of the vibration transmitting and receiving device according to the present invention.
[0039]
4 (A) to 4 (B) are diagrams for explaining the configuration and operation of one specific example
of the conventional vibration wave transmitting and receiving device.
[0040]
Explanation of sign
[0041]
DESCRIPTION OF SYMBOLS 1 ... Vibration transmission / reception device 2 ... Vibration drive
source 3 ... Oval shell part 4 ... Rigid body part 10 ... Vibration transmission / reception device 11
... Vibration drive source 12 ... Shell part 13 ... Rigid part 14 ... Lid part 15 ... Watertight part 16 ...
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Bracket 17 Matching transformer 18 Watertight cable 20, 21 Longitudinal end 23 of the shell
portion Node portion 24 Junction 25 Thin portion
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