close

Вход

Забыли?

вход по аккаунту

?

DESCRIPTION JPH0591097

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0591097
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic transducer for low frequencies of acoustic equipment used in water.
[0002]
2. Description of the Related Art FIG. 5 is a cross-sectional view of the configuration of a
conventional acoustic transducer of this type. In this transducer, in order to transmit at a low
frequency, an active columnar body 1 using a piezoelectric vibrator or a magnetostrictive
vibrator is inserted in the internal major axis direction of the elliptic shell 4 as shown in FIG. In
addition, the longitudinal vibration of the active columnar body 1 is converted to the flexural
vibration of the elliptic shell 4.
[0003]
However, since the main acoustic radiation surfaces 5a and 5b vibrate in the opposite phase of
the active columnar member 1, the short axis direction is 1 dB to the long axis direction in
directivity. It was 2 dB lower and it was not omnidirectional. In addition, when water pressure is
applied to the outside of the elliptic shell 4, a tensile stress acts on the active columnar body 1,
and therefore, generally mechanical stress is applied to the tensile stress when the mechanically
fragile piezoelectric vibrator or magnetostrictive vibrator is damaged at a depth There was a risk
13-04-2019
1
of
[0004]
According to the present invention, an acoustic radiation surface is provided in four planar
directions orthogonal to one another, and the same phase of sound wave is emitted in the four
directions, and the tensile force does not act on the active columnar body against the external
pressure. By realizing this idea, it is intended to provide an acoustic transducer that is
omnidirectional and can be used in depth.
[0005]
Also, if the number of active columns is four, a square space is created surrounded by the active
columns, so the transducer itself is slightly larger than in the prior art. The present invention
seeks to provide an overall compact acoustic transducer circuit containing the electronics
necessary for the operation of the transducer.
[0006]
According to the present invention, according to the present invention, a vibrator portion in
which four pairs of active columnar bodies 1 using piezoelectric or magnetostrictive vibrators are
joined in a square shape, and an ellipse with a major axis surface A housing shell in which four
sets of cut semi-elliptic shells are connected circumferentially, and the vibrator portion is
disposed inside the housing shell in which individual active columns are arranged in the
longitudinal direction of the individual semi-elliptic shells An acoustic transducer is characterized
in that it is held in place.
Also, an acoustic transducer circuit is obtained in which the electronic components necessary for
the operation of the vibrator section are disposed in the space surrounded by the four sets of
active columns.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a view showing the
structure of an embodiment of a transducer according to the present invention.
13-04-2019
2
The vibrator section in which four pairs of active columnar members 1 using piezoelectric
vibrators or magnetostrictive vibrators are joined in a square via a hinge 2 is divided into four
semi-elliptic shells, which are cut along the long axis direction equally on the circumference. Each
hinge 2 is joined and fixed to the inside of the joined housing shell 3 so as to be in point contact
with each other at two points.
[0008]
FIG. 2 is a view showing the operation of the embodiment according to the present invention.
Now, when an electrical signal having the same frequency as the mechanical resonance
frequency of the embodiment of the present invention including the vibrator portion and the
housing shell 3 is applied to the vibrator portion, the respective active columnar bodies 1
generate longitudinal vibration in the same phase. As a result of being synthesized from the
hinge 2, the vertical vibration arrows x and x ′ are transmitted to the housing shell 3 as the
vibration of the arrow y. This vibration is converted into bending vibration by the flexibility of
the four semi-elliptic shells and is transmitted to the acoustic radiation surfaces 5a, 5b, 5c, 5d as
the vibration of the arrow z. At this time, the vibration displacement of the acoustic radiation
surfaces 5a, 5b, 5c, 5d is two to three times the vibration displacement of the active columnar
body 1 due to the flexibility of the ellipse, so the volume of water as the medium is excluded. As
the amount is large and a large acoustic output is obtained even at low frequencies, and the size
of the transducer is smaller than the wavelength, combined with the addition of two acoustic
radiation surfaces, it becomes omnidirectional. However, the volume as a whole is larger than the
conventional one because the space 6 is relatively large. However, this point can be solved as
described later.
[0009]
FIG. 3 is an enlarged view showing a deformed state of the joint portion between the housing
shell 3 and the vibrator portion when water pressure is applied in the embodiment according to
the present invention. When water pressure is applied from the outside of the housing shell 3 as
indicated by an arrow, this junction point is only slightly shifted to both sides, and at this time, no
tensile stress due to water pressure acts on the active columnar body 1. Therefore, it is also
possible to operate at a deep depth. Although the hinge 2 and the housing shell 3 are joined in
the form of point contact, it is practically possible to contact even if the area is somewhat larger
than the figure.
13-04-2019
3
[0010]
FIG. 4 is a view showing an example of the construction of a circuit for operating the acoustic
transducer of the present invention of FIG. 1. In the space 6 surrounded by the active column 1
used in this acoustic transducer, a matching transformer 12 and When the attached electronic
components such as the module 13 are stored, the entire circuit can be stored in a single storage
case 14 including a housing shell. Therefore, the entire circuit becomes small.
[0011]
As described above, according to the present invention, by making the basic configuration of the
acoustic transducer into an isotropic shape, a low frequency acoustic transducer which can be
used in an omnidirectional manner and in depth can be obtained. As a whole, a compact,
lightweight, high-power, low-frequency acoustic transducer circuit can be obtained.
13-04-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jph0591097, description
1/--страниц
Пожаловаться на содержимое документа