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JPS57205799

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DESCRIPTION JPS57205799
Description of the Invention An electroacoustic transducer in which the gas is contained inside
the underwater wave transmitter cavity, a pressure regulator which adjusts the pressure of the
gas in the cavity equal to the external hydrostatic pressure, and the inside of the cavity
accompanying the generation of sound waves Submersible transmitter consisting entirely of lowpass filters to prevent pressure changes from being transmitted from the electroacoustic
transducer to the side of the pressure regulator.
Claims
The present invention relates to a submersible wave transmitter, and more particularly to a
submersible wave transmitter that efficiently transmits a low frequency wide band sound wave
into water. Conventional underwater transmitters have the disadvantage that the increase in
hydrostatic pressure due to changes in depth of use causes a significant change in the
electroacoustic properties of the seven. The causes can be roughly divided into two. The first
cause is that the diaphragm is displaced by the hydrostatic pressure applied to the diaphragm of
the underwater wave transmitter, and the electroacoustic conversion efficiency is reduced due to
zero displacement. Specifically, for example, in the case of an electrodynamic wave transmitter,
when the position of the imaging plate changes, the voice coil integrated with the imaging plate
is displaced. As a result, the magnetic flux in the magnetic circuit air gap does not work
effectively, and the driving force which is increased by 8 pi to produce the same sound output is
increased. The second cause is that the volume of the underwater transmitter cavity changes in
response to changes in hydrostatic pressure. Specifically, the pressure in the cavity is adjusted by
a bellows method using rubber or the like to prevent the displacement of the diaphragm
described above, and the stiffness of the cavity changes accordingly. That is, as the hydrostatic
pressure increases, the capacitance volume decreases, and the stiffness of the cavity increases
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accordingly, which causes an increase in the low resonance frequency and the lower limit of the
operating frequency. As a result, the electroacoustic conversion efficiency is extremely
deteriorated, and the electroacoustic characteristics are significantly changed. The present
invention is regarded as a defect of such a conventional underwater wave transmitter EndPage: 1
is considered, the above two causes of change in electro-acoustic characteristics are completely
eliminated, and even if the depth of use (hydrostatic pressure) changes, the low frequency An
object of the present invention is to provide a submersible wave transmitter capable of efficiently
transmitting a wide band sound wave without changing the electroacoustic characteristics. The
submersible transmitter according to the present invention comprises an electroacoustic
transducer in which gas is trapped inside the cavity, a pressure regulator which regulates the
pressure of the gas inside the cavity equal to the external hydrostatic pressure, and the inside of
the cavity associated with sound generation. And a low pass filter to prevent the pressure change
of the sensor from being transmitted from the electroacoustic transducer to the side of the
pressure regulator. By adopting such a configuration, the pressure in the cavity of the
electroacoustic transducer is always equally balanced with the external hydrostatic pressure
without changing the volume of the cavity, so that the static position of the diaphragm is always
kept at the initial setting position. Be Therefore, all the above objectives can be achieved. The
invention will now be described in more detail by way of example shown in the accompanying
drawings.
As shown in the attached drawings, the electro-acoustic transducer l is provided with a drive coil
12 and an imaging plate 13 provided in the air gap of the magnetic circuit 11 and 7. An
alternating current (not shown) is applied to the drive coil 12 from a flow power source, whereby
the imaging plate 13 vibrates and a sound wave is emitted. The cavity 15 of the electroacoustic
transducer 1 is connected to the low pass filter 2 via the pipe 4, and the low pass filter 2 is
connected to the pressure regulator 3 via the pipe 5. The low pass filter 2 is a mechanical filter,
and by setting the cutoff frequency sufficiently lower than the lowest frequency of the
electroacoustic transducer 1, the pressure change in the cavity 15 when the diaphragm 12
vibrates becomes a pressure It is intended to prevent transmission to the side of the regulator 3.
Further, the pressure regulator 3 has a function 7 for detecting the external hydrostatic pressure
and constantly making the pressure in the pressure regulator 3 equal to the external hydrostatic
pressure. The inside of the pressure regulator 3 is a pipe 5. as described above. Low pass filter
Because the pipe 3 is connected to the cavity 15 in the electroacoustic transducer 1, the pressure
in the cavity 15 is always kept equal to the pressure in the pressure regulator 3, that is, the
external hydrostatic pressure. Therefore, according to this embodiment, the pressure of the
cavity 15 in the electroacoustic transducer 1 is always balanced with the external hydrostatic
pressure regardless of the water depth, and the diaphragm 13 is always statically set to the initial
setting position. Will be kept. Therefore, the mutual positional relationship between the drive coil
12 and the magnetic quantity yJ 14 is always maintained in one pair, and it is possible to reliably
prevent the change in the electroacoustic conversion rate due to the change in the external
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hydrostatic pressure. In addition, the volume of the cavity 15 in the electroacoustic transducer 1
is always held by one pair even if the external hydrostatic pressure (water depth) changes.
Therefore, the change in the stiffness of the cavity 15 is small, which makes it possible to reduce
the change in the low frequency coincidence frequency. In addition, it is possible to use a pore as
said low pass filter 2 when the change of the external hydrostatic pressure is loose. As apparent
from the above description, according to the present invention, C which simultaneously removes
the above two causes of change in the electroacoustic characteristics can be obtained, and unlike
the conventional underwater wave transmitter, even if the depth of use changes. It is possible to
provide a submersible wave transmitter that efficiently transmits a wide band sound wave
without changing the electroacoustic characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate one embodiment
of the present invention. 1 ... electro-acoustic transducer, 2 ... low pass filter, 3 ... pressure
regulator, 4.5 ... pipe. Attorney Attorney Attorney Akimoto EndPage: 2
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