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JPS627299

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DESCRIPTION JPS627299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibrator for converting an electrical signal and an acoustic signal, and more particularly to a
vibrator for an underwater transducer used in a sonar or the like. [Background Art] A
conventional vibrator of this type is a so-called lange-pan type vibrator as shown in FIG. 3 (a)
which is relatively small, light and has a low mechanical Q. The sound wave was radiated and
remitted through an acoustic window such as rubber as shown. [Problems to be Solved by the
Invention] The above-mentioned conventional Langevin-type vibrator has the following
drawbacks. The rang-pan type vibrator sets the resonance frequency in accordance with the
frequency so that the sound wave can be emitted and received most efficiently at the working
frequency of the sonar or the like. That is, as shown in FIG. 3 (b), the resonance of 172
wavelengths is made such that the vicinity of the central part of the Lange-Pan type vibrator
becomes a node of vibration, and the front mass and rear mass increase on both ends become
antinodes of imaging. It is designed to do. Therefore, if the use frequency is determined 10, the
total length of the vibrator needs to be designed to be shortened under this basic condition,
which is considerably limited. Also, as shown in FIG. 4, when the transducer is configured, the
hydrostatic pressure applied to the vibrator through the acoustic window such as rubber is
received by the shock absorbing material 2 such as cork inserted between the housing 3 and the
rear mass. Therefore, as the depth of use of the transducer increases, the hydrostatic pressure
rises, and the cork is compressed by a strong force, and the characteristics of the cork as a shock
absorber deteriorate, thereby restricting the rear mass vibration that should be vibrated freely.
And the sensitivity of the transducer is reduced. [Means for Solving the Problems] In order to
solve the above-mentioned 1ia1 point, the complex type vibrator of the present invention has the
node to the rear and the node to the front inside of the conventional runge-pan type vibrator. It
comprises. Next, the present invention will be described with reference to the drawings. FIG. 1 (a)
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1
is a cross-sectional view of an embodiment of the present invention. The vibrator of the present
invention is basically characterized in that the rear part is formed inside the front part of the
node part of the conventional Langevin type vibrator. That is, as shown in FIG. 1 (b), a section of
1?4? of the operating frequency is formed outside, and a section of 1?4? is internally provided
through the node member 4, whereby a total of 1?2? is obtained. It has a structure that vibrates
at resonance. Now, assuming that the stiffness of the ceramic part in the section of 1 / 4? is S
and the mass of S mass is m, there is the following relationship with the resonance frequency fo.
(2?fo) 2 = s / m, ie, using a material with a low Young's modulus as a ceramic material to reduce
the stiffness and using a material having a large specific gravity, such as a copper alloy, as a mass
to obtain internal ? / 4 of ? The dimensions of the sections can be designed short and can be
accommodated inside the outside.
In order to drive this vibrator, an electric field is applied such that the inner ceramic contracts as
the outer ceramic extends. Here, since stress in the opposite direction is applied to the nodal
member 4 due to the external ceramic and the internal ceramic to generate shear stress, a
material having a high Young's modulus such as steel and a large strength is used as the
material. In the present embodiment, ceramic is used as the drive element, but other than
ceramic such as magnetostrictive material may be used. Furthermore, when configured as a
transducer as shown in FIG. 2, the hydrostatic pressure applied through the acoustic window 1 is
received by the shock absorbing material 2 'inserted between the node member 4 and the
housing 3. Unlike the rear mass in the case of the vibrator, since the nodal member hardly
vibrates because it is a node of vibration, there is no need for a soft material such as cork as a
buffer used here, for example, synthetic resin etc. Even relatively hard materials do not prevent
free movement of the transducer. Therefore, the depth of use of the transducer increases, and
even if the hydrostatic pressure rises, the characteristics of the buffer material do not change,
and the sensitivity of the transducer hardly changes. [Advantage of the Invention] By configuring
as described above, the vibrator of the present invention can be resonated at a size of 1?4 ? of
the operating frequency, which is about 172 of the size of the conventional Langevin-type
vibrator, which is small. Can be
[0002]
Brief description of the drawings
[0003]
1 (a) is a cross-sectional view of an embodiment of the composite vibrator of the present
invention, FIG. 1 (b) is a diagram showing vibration displacement at a certain point, and FIG. 2 is
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2
a diagram using the composite vibrator of the present invention 3 (a) is a cross-sectional view of
a conventional Langevin-type vibrator, FIG. 3 (b) is a diagram showing vibration displacement at
the time of fitting, and FIG. It is a fragmentary sectional view when a transducer is constituted
using a Langevin type vibrator of the above.
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и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и External
ceramic .... Internal rear mass. Attorneys Attorneys Attorney Uchihara Bud! Fig. CI)) $ 4 closed
04-05-2019
3
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