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JP2000329842

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2000329842
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer for transmitting and receiving ultrasonic waves, and more particularly, to
an ultrasonic transducer excellent in impact resistance which is small when not in operation and
small in size during operation. .
[0002]
2. Description of the Related Art Conventionally, there is a sonobuoy system which detects an
underwater object from an airplane or the like by dropping it into the sea. This system generates
sound from a sound source using underwater explosion, electrical conversion, etc., receives
reflected sound from an underwater object by a plurality of sonobuoys, and orients the
underwater object from the phase difference and amplitude value of individual acoustic signals, It
is a system that detects depth. Conventionally, the ultrasonic transducer used for Sonobuoy is
non-directional, so the resolution is poor, a plurality of Sonobuoys are required to detect an
underwater object, which is expensive, and the detection accuracy is also poor.
[0003]
As a technique for solving this problem, there is a "horizontal linear array extending apparatus"
described in JP-A-10-282223. This is an ultrasonic transducer in which a plurality of watertight
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piezoelectric ceramics are connected by a string, housed in a cylinder of a cylinder when not in
operation, automatically removing the cylindrical cover during operation, and expanding the
array length by stretching the string Generally, piezoelectric ceramics are used for the
electroacoustic transducer of this type of sonobly type ultrasonic transducer. However, no
consideration is given to mass, storage space at the time of non-operation, enlargement of the
array length, and material destruction due to impact force at the time of dropping in water.
[0004]
Sonobuoy has not only an ultrasonic transducer, but also an electronic circuit unit, a wireless
unit, a float unit, etc., and the space for storing them is limited, and the space for the ultrasonic
transducer is also considerable. It should be narrow (specifically, about 10 cm in diameter and
about 30 cm in length) and lightweight. And it receives an impact in order to load and drop it on
an airplane etc.
[0005]
Therefore, an object of the present invention is to provide an ultrasonic transducer which is
excellent in reduction in size and weight and can maximize the array length in a limited space
and also has excellent impact resistance.
[0006]
[Means for Solving the Problems] In order to achieve the above object, the present invention is a
piezoelectric composite material obtained by filling an elastic member such as a resin such as
urethane epoxy resin or rubber or the like in a piezoelectric ceramic. A mechanism was provided
to roll up the material.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION A plurality of circular tubes or spherical
piezoelectric ceramics are connected by a string, stored in a cylindrical tube when not in
operation, and removed from the tube in operation to extend the length of the array to enlarge
the array length. In the above method, the piezoelectric ceramic is used for the electroacoustic
transducer of the ultrasonic transducer, so that the mass is large, the storage space at the time of
non-operation becomes large, and it is difficult to expand the array length.
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Further, even if the size of the piezoelectric ceramic can be reduced and the storage space can be
secured, the impedance becomes large, so that the thermal noise becomes large or the voltage
drop due to the signal cable occurs to deteriorate the electroacoustic performance.
[0008]
Furthermore, when the acoustic beam is scanned in any direction, a signal cable with the number
of channels is required in order to make the electric signal of each piezoelectric ceramic channel
independent, which results in large bulk.
In terms of mechanical strength, since the ceramic is weak to impact, the material may be broken
due to the impact force when dropped in water.
[0009]
According to the present invention, the radiation and sound receiving surface of the ultrasonic
transducer can be widely configured, and impedance can be lowered, so that the size and weight
are excellent without deteriorating the electroacoustic performance, and the array length in a
limited space In addition, it is possible to realize an ultrasonic transducer excellent in impact
resistance while being able to maximize the momentarily. Hereinafter, an embodiment of an
ultrasonic transducer according to the present invention will be described.
[0010]
An embodiment will be described with reference to FIG. FIG. 1 is a view for explaining an array
expansion method of a telescopic ultrasonic transducer. FIG. 1 (a) shows a storage form of a
telescopic ultrasonic transducer according to the invention. The electroacoustic transducer unit 1
is wound by the weight unit 2 and stored compactly. Further, in order to lower the electric signal
of the electro-acoustic transducer 1, a suspension and cable 4 is provided at the end of the
electro-acoustic transducer 1 via the connector 3. The expanded form is shown in FIGS. 1 (b) and
1 (c). At the time of deployment, when the weight portion 2 falls vertically downward by the
weight of the weight portion 2, the electro-acoustic transducer 1 can be automatically deployed
and the array length can be expanded. Further, the electroacoustic conversion unit 1 and the
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weight unit 2 are connected by the suspension unit 5 so as not to be separated.
[0011]
The electroacoustic transducer 1 of the ultrasonic transducer shown in FIG. 1 is a piezoelectric
composite material formed by filling a columnar or powdery piezoelectric ceramic with a resin
such as urethane epoxy, rubber, or the like. This material has a specific gravity as small as about
3 with respect to the piezoelectric ceramic of about 8 and is lightweight, and its shape can be
freely deformed, so that it becomes possible to wind in a roll as shown in FIG. Factor can be
stored well compactly. At the time of operation, as shown in FIGS. 1 (b) and 1 (c), the array length
can be expanded by expanding the roll-shaped electroacoustic transducer 1 long.
[0012]
Further, as shown in FIG. 2, since the electrodes 8 (a) to 8 (c) can be constituted by faces, the
impedance can be reduced and the electroacoustic performance is not deteriorated as compared
with the piezoelectric ceramic. Furthermore, even when the acoustic beam is scanned in any
direction, the electrodes 8 (a) to 8 (c) can be formed of a thin surface on the piezoelectric
composite as shown in FIG.
[0013]
FIG. 2 is a view for explaining an example of the electrode wiring method of the stretchable
ultrasonic transducer.
[0014]
2 (a) to 2 (c) constitute the electrodes 8 (a) to 8 (c) on the A surface and the B surface of the
piezoelectric section 7, respectively, and the A surface electrode is divided into 8 (a) and 8 (b).
Separate as in) and pass the signal pattern on the left side.
The B-side electrode 8 (c) is a common ground electrode. The electric signal generated by the
piezoelectric unit 7 is transmitted by the suspension and cable unit 4 via the electrode 8 and the
connector unit 3. This electrode is separated and insulated from seawater by the watertight mold
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portion 6.
[0015]
FIGS. 2D to 2F show an example in which an electrode pattern is separately provided in the A2
layer via the insulating layer 9. By doing this, the electrodes 8 (a) and 8 (b) of the A1 layer can be
made large, and the electroacoustic performance is improved as compared with FIGS. 2 (a) to 2
(c).
[0016]
Further, since the piezoelectric ceramic is also filled with a soft resin in terms of mechanical
strength, it is absorbed by the resin or rubber (elastic material) even if an impact force is applied,
and the impact resistance is also good.
[0017]
FIG. 3 is a view showing an example of a reinforcing structure, showing a reinforced ultrasonic
transducer.
When deployed in an array as shown in FIG. 1, since tension acts on the electroacoustic
transducer 1, it is necessary to add to the electroacoustic transducer 1 a reinforced portion made
of alamid fiber, glass, carbon fiber or the like for relieving the tension. There is. Naturally, in
order to be stored in a roll, the reinforcing portion 10 must also be able to be deformed.
[0018]
FIG. 3A shows an ultrasonic transducer in which a reinforcing portion 10 in which a reinforcing
fiber made of aremid fiber, glass, carbon fiber or the like is filled with a resin or rubber is
adhered to the electroacoustic transducer 1. FIG. 3 (b) shows an ultrasonic transducer in which
reinforcing fibers are embedded in the electroacoustic transducer 1 together with the
piezoelectric unit 7.
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[0019]
Next, an array length extension method for smoothly and straightly expanding the
electroacoustic transducer 1 will be described. 1 (b) and 1 (c) show a method of unfolding the
electro-acoustic transducer 1 by attaching the weight 2 to the end of the electro-acoustic
transducer 1 and dropping it in the vertical direction by its own weight. There is. In this case,
since there is a possibility of twisting due to the tidal current, FIG. 4 mounts the telescopic tube
11 (for example, a rubber tube of a tire, etc.) on the back of the electroacoustic transducer 1 and
the reinforcement 10. The compressed fluid 13 of (1) is pressed in during array deployment via
the fluid pressing compressor portion 12. This telescopic tube 11 develops the electroacoustic
transducer 1 straight as shown in FIGS. 4 (b) to 4 (c) by forming a column of an apparently rigid
body by putting a compressed fluid on the back of the electroacoustic transducer 1. Can be
maintained. As the fluid, it is best to put in the surrounding seawater, but in order to adjust the
specific gravity, oil or the like with a low specific gravity may be used. Also, a shape memory
alloy may be used instead of the expandable tube 11.
[0020]
The expansion operation will be described with reference to FIGS. FIG. 4 is a view for explaining
the array expansion method of the expandable ultrasonic transducer in which the expandable
tube 11 is added to FIG.
[0021]
First, it is housed in a cylindrical cylinder as shown in Sonobuoy 25 (a) of FIG. 6, and dropped
from the air to the sea surface by an airplane or the like. In the sea, the electroacoustic
transducer 1, the electronic circuit 16, the radio unit 17, the float 18 and so on are separated,
and the cylinders 19 (a) and (b) of the cylinder are automatically detached, as shown in FIG. The
electroacoustic transducer 1 is developed in an array by its own weight. Further, in equilibrium
with this, the compressed fluid 13 is pressed into the drawing telescopic tube 11 via the fluid
press-in compressor portion 12 to make a column of fluid. Sonobuoy 25 (b) after expansion is
shown in FIG. FIG. 7 shows an example in which the array is expanded not only in the vertical
direction but also in the horizontal direction. In this case, when air or the like having a low
specific gravity is used as the compressed fluid 11, a weight is attached to the tip of the
buoyancy adjustment parts 24 (a) to 24 (b) and a material having a high specific gravity is used
24 (a) In (24) (b), a float for adjusting the specific gravity is attached to the tip of the weight, not
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to the weight, and the array of the fluid is expanded straight by the column of fluid of the
telescopic tube 11. By expanding long arrays horizontally and vertically, the resolution of depth
and orientation can be improved.
[0022]
FIG. 5 shows a compressed fluid distribution mechanism for pressing the compressed fluid 13
into the plurality of telescopic tubes 11. The compressed fluid 13 compressed by the fluid pressin compressor 12 is first press-fitted into the distribution unit 14. The distribution unit 14
includes a plurality of nozzles 15 (a) to 15 (F), and by attaching the telescopic ultrasonic
transducer shown in FIG. Here, in order to prevent each telescopic ultrasonic transducer from
being twisted when developing the array simultaneously, each nozzle 15 is provided with a
bender 26 whose opening / closing amount changes according to the pressure value. Since the
compressed fluid 13 can be pressed into each of the telescopic ultrasonic transducers in order,
the array can be expanded sequentially instead of simultaneously.
[0023]
FIG. 6 is a view for explaining a storage mode at the time of non-operation of Sonobuoy. The float
18, the wireless unit 17, the control unit 20, and the telescopic ultrasonic transducer 1 are
housed in a cylinder of a cylinder. The metal case 19 is taken in water when it is landed and
developed into a necessary form.
[0024]
FIG. 7 shows an embodiment of an ultrasonic transducer according to the present invention. This
is an example in which the telescopic ultrasonic transducer 1 described above is developed in a
T-shape. A plurality of telescopic ultrasonic transducers 1 ', an electronic circuit portion 20, a
radio portion 17, a float portion 18 and the like, and an external or telescopic ultrasonic
transducer 1' transmits an acoustic signal to reflect from an underwater object The wave is
received by a telescopic ultrasonic transducer. By dividing the electroacoustic transducer into a
plurality of CHs upon reception, the acoustic beam is scanned or a received signal is awaited with
a plurality of acoustic beams, and the depth and direction of the underwater object are detected.
Here, the depth is detected by the stretchable ultrasonic transducer 1 ‘(a), and the direction
signal is detected by the stretchable ultrasonic transducer 1‘ (b) to (c). The detected signal is
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transmitted to the observation station through the electronic circuit unit 20, the cable units 22
and 23, and the radio unit 17.
[0025]
A method for expanding an array of telescopic ultrasonic transducers according to the present
invention will be described with reference to FIG. The electroacoustic transducer 1 is housed in
advance in the vacuum expansion and contraction tube 11 and is accommodated in a roll shape
as shown in FIG. 1A, and the compressed fluid 13 is transferred to the expansion and contraction
tube 11 according to the principle described in FIG. Press in and deploy into an array. Here, it is
the compressed fluid 13 that has been degassed so as not to attach air bubbles to the
electroacoustic transducer 1 so as not to impair the acoustic performance, and the expandable
tube 11 also needs to be of good acoustic transparency.
[0026]
As described above, according to the present invention, a stretchable ultrasonic transducer
excellent in reduction in size and weight and capable of instantaneously maximizing the array
length in a limited space and excellent in impact resistance. Can be realized.
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