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JPS57206193

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DESCRIPTION JPS57206193
ll Tube Name of the Invention The water pressure in the cabinet of the electroacoustic transducer
is always in equilibrium with the external hydrostatic pressure by the underwater wave
transmitter pressure regulator, and the minute inside the cabinet accompanied by the wave
transmission by the low-pass filter In the submersible wave transmitter of the type for preventing
a pressure change from being transmitted even to the pressure regulator, the cabinet is divided
into a first air chamber and a second air chamber on the side provided with a diaphragm, An
underwater wave transmitter characterized in that a position movable am sound wall is provided
inside a cabinet so that the volume of the air chamber of the cylinder Nl changes in proportion to
the external hydrostatic pressure supplied by the pressure regulator.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater
wave transmitter for emitting sound waves into water, and more particularly, to a water which
has low frequency broad band frequency characteristics and whose acoustic characteristics are
stabilized against changes in water depth. It relates to a transmitter. In the conventional
underwater wave transmitter, as means for conflicting with the diaphragm when sound is
radiated into the air, means for utilizing expansion and contraction, that is, distortion of the
object has been taken. This makes it possible to easily densify the air by displacement of the
diaphragm in the air, but in water it is a V of water! Since the i degree is larger than air, the
displacement of the diaphragm is transmitted to the water <<<, and the diaphragm is easily
deformed by water pressure. Such a conventional underwater wave transmitter using expansion
and contraction, that is, distortion of an object has a feature metal that has a high electroacoustic conversion rate using resonance. However, flat frequency characteristics can not be
obtained no matter how low the resonance frequency is, so a stagger resonance system or the
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like has generally been used. In the case of resonating by using the expansion or contraction of
the object, that is, distortion, it was impossible to lower the resonance point to the vicinity of the
low frequency region of the voice regardless of the existing materials and choosing a material
having a low Young's modulus. Therefore, in the conventional underwater wave transmitter,
since the expansion and contraction of the object can be used to stabilize the acoustic
characteristics against changes in water depth, it is impossible to obtain a low frequency wide
band flat frequency band EndPage: 14 GI characteristics. there were. The present invention has
been made in view of the disadvantages of such conventional underwater wave transmitters, and
has a low frequency broad band and flat frequency characteristics, and can stabilize the
characteristics against changes in water depth. The present invention aims to provide a
transmitter. The present invention is to contact the acoustic radiation surface of the diaphragm
with water as a medium without enclosing the expansion and contraction of the object, and to
enclose the air inside the diaphragm and the outside. This is based on the experimental results
that even if the diaphragm is capable of emitting sound waves in water if the diaphragm is
always statically set at the initial setting position by keeping the air pressure equal to the water
pressure. is there. In the submersible wave transmitter according to the present invention, the
pressure in the cabinet of the electroacoustic transducer is equalized to the external hydrostatic
pressure by the pressure regulator, and the low-pass filter causes minute and small pressure
changes in the cabinet due to transmission. The submersible wave transmitter of the type for
preventing the transmission to the side of the pressure regulator, and further the first air
chamber and the second air chamber on the side provided with the diaphragm in the cabinet 57206193 (2) A partition and a movable sound barrier are provided inside the cabinet so that the
volume of the first air chamber changes in proportion to the pressure equal to the external
hydrostatic pressure supplied from the pressure regulator. It is characterized by
That is, as described above, the underwater wave transmitter according to the present invention
aims to emit a low frequency broad band sound wave. It is necessary to lower the collision point
of the drive system of the electroacoustic transducer including the diaphragm support and use it
in the mass control region. In this ninth case, it is necessary to lower the support stiffness of the
diaphragm, but when the support stiffness is lowered, the static position of the diaphragm
changes due to the hydrostatic pressure applied to the acoustic radiation surface of the
diaphragm I can not hold it. In the ninth place, the acoustic characteristics will change
significantly depending on the water depth. Therefore, in the underwater transmitter according
to the present invention, the pressure inside the cabinet is always balanced with the external
hydrostatic pressure so that the static position of the diaphragm does not change even if the
water depth changes. For this purpose, a pressure regulator and a low pass filter are provided.
Further, the bass side coincidence frequency f of the electroacoustic transducer is generally
expressed by the following equation on page 5. CCT, the stiffness of the 5aid carpet means sd, sd
means the support stiffness of the diaphragm. . Is the mass of the drive system 0 As is apparent
from this equation, the frequency af depends on the stiffness Sc of the cabinet. このキャビネット
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のステイフネルS。 Is generally expressed by the following equation. ここで、!。 Denotes the
density of the medium in the cabinet, Co denotes the speed of sound, S denotes the diaphragm
area St-mean, and vo denotes the volume of the cabinet. (In the z equation, the pressure change
of the sound velocity Co is so small as to be negligible, and the area S of the diaphragm is
constant, so the density of the medium !. If the cabinet volume Vat changes in accordance with
the change of the cabinet capacity, the stiffness S0 of the cabinet becomes constant, and the
frequency f also becomes constant from the equation (1). Density of medium as well known. Is
one that is proportional to the pressure of the gas according to the law of gas, and as described
above, the pressure in the cabinet is configured to change in accordance with the external
hydrostatic pressure by the pressure regulator. Therefore, in the present invention, the inside of
the cabinet is separated by a sound insulation wall into a first air chamber (corresponding to a
cabinet with a volume vc) and a second air chamber, and this fast break wall is supplied from the
pressure regulator. The water depth dependency of one frequency f is eliminated by movably
forming according to the pressure equal to the water pressure. The invention will now be
described in more detail by way of example shown in the accompanying drawings. FIG. 1 shows
an embodiment of the submersible wave transmitter according to the present invention, and
shows a configuration for balancing the pressure in the cabinet of the electroacoustic transducer
1 with the external hydrostatic pressure.
That is, the pressure regulator 3 detects the external hydrostatic pressure, adjusts it to the air
gold iron detection pressure supplied from the high pressure cylinder via the air supply pipe 23,
and the electroacoustic transducer l via the air supply pipe 22.21t- Supply the inside of the
cabinet. This balances the external hydrostatic pressure and the pressure inside the cabinet.
EndPage: 2 几, the low-pass filter provided between the electroacoustic transducer Ill and the
pressure regulator Jl 30 is a minute pressure change inside the inside yabinette when the
electroacoustic transducer l emits a sound @ The pressure regulator 3 is used to stop it from
being transmitted by t-m. Therefore, it is necessary to set and set the cutoff frequency lower than
the frequency f of the sound wave emitted by the electroacoustic transducer 1. FIG. 2 shows the
internal structure of the electroacoustic transducer @X in 111 LIFiAK and nine embodiments. In
the same figure, the inside of the inside cavity 9 is divided into a first air chamber 17 including a
diaphragm 11, a drive coil, a center pole 13, a magnetic circuit 14 and a permanent magnet 15,
and a second air chamber 18. There is. The sound insulation wall 19 partitioning the two air
chambers 17 and 18 is formed with a movable mK shadow as shown in the figure, and stands
still at a position where the spring 20 balances the 9 atmospheric pressure supplied from the
pressure regulator 3 via the pipe 21 . By this K, the volume of the first air chamber is
automatically displaced in proportion to the external hydrostatic pressure. Therefore, the
stiffness of the midday mesh is maintained at a constant value regardless of the water depth, and
the water depth dependency of the frequency of the sound wave emitted by the electroacoustic
transducer 1 can be removed. As apparent from the above 1 light, according to the present
invention, it is possible to provide a stabilized underwater wave transmitter having low frequency
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broad band and flat frequency characteristics regardless of water depth.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the present invention, and FIG. 2 is an explanatory view showing an internal structure of the
electroacoustic transducer shown in the first embodiment. DESCRIPTION OF SYMBOLS 1: ..
Electroacoustic transducer 2 ... low-pass filter 3 ... pressure regulator 4 ... high pressure cylinder
16: cabinet, 17 ... 1st air chamber, 18 ... 2nd air chamber, 19 ... movable m noise barrier, spring ...
21.22.23 ... air supply pipe. Attorney Atsushi Akimoto End Page: 3
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