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JPH04107996

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DESCRIPTION JPH04107996
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater ultrasonic transducer, and more particularly to a transducer having a bendix shell.
[0002]
2. Description of the Related Art A conventional underwater ultrasonic transducer of this type is
shown in FIGS. 3 (a) and 3 (b) respectively as a cross sectional view and a longitudinal sectional
view. The active columnar body 2 is internally provided. Then, during operation, the force due to
hydrostatic pressure deforms the bendix shell 1A in the flat direction, and the stress due to this
deformation acts on the active columnar body 2 as a tensile stress, thereby protecting the active
columnar body 2 weak to the tensile stress. The compressive stress application mechanism 3 for
applying compressive stress to the active columnar body 2 is provided in advance.
[0003]
Also, in order to facilitate the incorporation of the active columnar body 2 when the active
columnar body 2 is mounted inside the bendix shell 1A at the time of manufacture, the active
columnar body 2 is deformed while the bendix shell 3 is deformed by an external force. A
method has been taken to increase the length of the attached part.
[0004]
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1
Such a conventional underwater ultrasonic transducer incorporates a compressive stress
applying mechanism 3 for protecting the active columnar body 2 in the bendix shell 1A. The
internal space of the bendix shell 1A is narrowed by the share of the compressive stress applying
mechanism 3, and the active columnar body 2 that can be incorporated is miniaturized, which
makes it difficult to obtain a large driving force.
In addition, even if the bendix shell 1A is deformed by applying an external force, the amount of
deformation can not be large, so there is a problem that the work of incorporating the active
columnar body 2 is difficult. An object of the present invention is to provide an underwater
ultrasonic transducer which can obtain a large driving force and which can easily incorporate an
active column.
[0005]
SUMMARY OF THE INVENTION In the underwater ultrasonic transducer according to the present
invention, a bendix shell having an interior of an active columnar body is formed of a shape
memory alloy.
[0006]
According to the present invention, by utilizing the shape and dimensional change of the shape
memory alloy due to the temperature change, the bendix shell is expanded to facilitate the
incorporation when incorporating the active columnar body, and after the incorporation, It
shrinks to generate compressive stress.
[0007]
Next, the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an underwater ultrasonic transducer according to the present
invention before assembly, wherein 1 is a bendix shell and 2 is an active columnar body.
The bendix shell 1 is formed of a shape memory alloy such as a Ni-Ti alloy whose shape is
changed by a temperature change, and is formed to have a predetermined size and shape at a
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2
normal use temperature. Further, the active columnar body 2 is formed of a piezoelectric ceramic
or a magnetostrictive material. Furthermore, as shown in the drawing, the internal space of the
bendix shell 1 incorporating the active column 2 is formed to be slightly smaller than the size of
the active column 2 to be fitted.
[0008]
The inside of the bendix shell 1 is kept at a low temperature by liquid air or the like before the
active column 2 is incorporated, and is deformed so as to expand the size of the inner space at
the transformation temperature. This dimension is at least larger than the dimension of the active
column 2. Then, when the active columnar body 2 is incorporated in the internal space of the
bendix shell 1 and then left at room temperature, the bendix shell 1 reduces its overall size as the
temperature rises, as shown in FIG. Size and shape. Therefore, the active columnar body 2 is to
be installed in a state of receiving a compressive stress from the inner wall of the bendix shell 1.
[0009]
As a result, it becomes possible to apply a compressive force to the active columnar body 2 by
means of the bendix shell 1, and the tensile force caused by hydrostatic pressure during
operation can be obtained without using a conventional compressive stress application
mechanism. Thus, the active columnar body 2 can be protected. Further, the internal space of the
bendix shell 1 can be effectively utilized because the compressive stress application mechanism
is not required, and the active columnar body 2 can be enlarged and the driving force can be
increased.
[0010]
As described above, according to the present invention, by using a shape memory alloy as a
bendix shell, a bend of an elastic region or more at a temperature lower than the transformation
temperature of the shape memory alloy when incorporating an active columnar body is obtained.
Since the disk shell can be deformed and the displacement can be increased, the assembly
operation can be facilitated. In addition, since it is possible to apply a compressive stress to the
active columnar body by using the bendix shell itself, the compressive stress application
mechanism can be eliminated, and the active columnar body can be enlarged by the amount
corresponding to the space. It has an effect that the driving power can be increased while the
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shape is high, and high power can be achieved.
[0011]
Brief description of the drawings
[0012]
1 is a cross-sectional view of the embodiment of the present invention before incorporation.
[0013]
2 is a cross-sectional view of the assembled state of one embodiment of the present invention.
[0014]
3 shows a conventional underwater ultrasonic transducer, (a) is a transverse sectional view, (b) is
a longitudinal sectional view.
[0015]
Explanation of sign
[0016]
1 Bendix Shell 2 Active Column
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