JPS5815397

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DESCRIPTION JPS5815397
[0001]
According to the present invention, even if the external water pressure changes, the air pressure
inside the speaker can be changed accordingly to change it, and the diaphragm which is the main
part of the speaker can be configured to exhibit a predetermined performance. The present
invention relates to an underwater wave transmission device. In the past, sound wave emission
into water was performed using expansion and contraction of the object, but even if the
electroacoustic conversion efficiency is good in this case, the resonance phenomenon of the
electrostrictive element or the magnetostrictive element Because it is used, there is a
disadvantage that the narrow band frequency band makes it impossible to perform wide-band
acoustic conversion. For this reason, it has recently been considered to use a speaker. This is
because it is general to use the speaker exclusively in air, but since broadband transmission is
possible, it was thought that broadband transmission was possible even in water. When the
speaker is used, the air pressure inside the speaker is constant, and there is no particular
problem as long as it is used under the condition of constant water depth balanced with the
external water pressure. However, if the external water pressure and the internal pressure of the
speaker are not balanced, the diaphragm, which is the main part of the speaker, deforms in the
outward and inward directions according to the pressure difference) It is obvious that the
performance can not be obtained. That is, in the case of the underwater transmission apparatus
according to the prior art using a speaker, there is no particular problem when used under a
fixed depth, but when used under other depths, the speaker is specified. The fact is that it was
not possible to demonstrate the acoustic performance of Therefore, it is an object of the present
invention to provide an underwater wave transmission device configured such that the speaker
can exhibit predetermined performance by causing the internal air pressure to follow the
external water pressure even when the depth changes significantly. It is to offer. For this
purpose, the present invention detects the change of external water pressure by the diaphragm
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and makes the internal pressure of the speaker follow the external water pressure by the
expansion and contraction action of the diaphragm itself, but the expansion and contraction
position of the diaphragm is out of the set range. In such a case, the detection output is used to
supply high compressed air to the inside of the speaker or to exhaust the air inside the speaker
to the entire outside of the air. Hereinafter, the present invention will be described with reference
to the attached drawings. The figure shows the configuration of an example of the underwater
wave transmission device according to the present invention. A diaphragm 11 is mounted with
good airtightness and water tightness inside the pressure regulator 9 having a good pressure
resistance, which is composed of an appropriate member 10 as shown, so that the inside of the
pressure regulator 9 is an air chamber 4 and so on. The external water introduction chamber 5 is
divided into two.
Among them, the external water introducing chamber 5 is communicated with the external water
through the external water pressure introducing pipe 6, and the air chamber 4 has an air supply
pipe 2 and an exhaust pipe 7 to which ta valves 3.8 are attached respectively. In addition to
being able to communicate with the highly compressed air tank 1 and the external water via the
internal pressure communication pipe 12t- through the internal air pressure communication pipe
12t-it is in communication with the inside of the transmitter 18 as a speaker. The internal air
pressure communication pipe 12 brings the air chamber 4 and the inside of the transmitter 18
into an equal pressure state. In this case, the transmitter (shown as a partial fracture) 18 is of
course immersed in water, and made water-tight and airtight from the 2o provided for use in an
IIII JiS! Then, the speaker is accommodated in the state where the diaphragm 13 is exposed to
the outside. The current from the cable 19 is supplied to the coil 14 in a state where the nine
coils 14 are disposed in the gap provided in a part of the magnetic circuit consisting of the
permanent magnet 17 and the coil bobbin 16t-via the coil bobbin 16t. If so, the diaphragm 13 is
in a vibrating state, so that its radiation surface 15) is such that sound waves are transmitted into
the water. The electromagnetic pulp 3 is opened with the external water introduced into the
external water introduction chamber 5 at the time of sound wave radiation into water, and the
highly compressed air from the highly compressed air tank 1 is supplied to the air chamber 4.
This air supply gradually expands the diaphragm 11a and extends downward, but when the
magnetic sensor 20 as a senna detects magnetism from the permanent 6 stone 23 attached to
the plate under the diaphragm 11 By closing the electromagnetic pulp 3, the diaphragm 1iFi is
set to an appropriate telescopic position. Of course, in this state, the external water pressure and
the air pressure inside the air chamber 4 and the transmitter 18 are equal [from 61, it is clear
that the diaphragm 13 can transmit the sound waves into the water without any deformation. As
long as the diaphragm 11 can expand and contract due to the change in depth, the external
water pressure and the internal pressure of the transmitter 18 are equal, so no particular
problems occur. However, if the depth changes significantly, the expansion and contraction of
the diaphragm 11 reaches a limit, and since the balance between the external water pressure and
the internal pressure can not be maintained, the diaphragm 13 is subjected to deformation due to
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the pressure difference. It is clear. Therefore, in the present invention, when the expansion /
contraction limit position of the diaphragm 11 is detected with a margin, control is performed to
open one of the electromagnetic pulps 3.8 to return the diaphragm 11 to the set expansion /
contraction position.
That is, #! When the degree increases, the diaphragm 11 is gradually shrunk upward, so that the
electromagnetic pulp 3t is opened when the magnetic sensing element 21 detects that
immediately before reaching the upper limit position. . As a result, it is extended in the downward
direction by the air supply of the diaphragm 1ltj. If the electromagnetic pulp 3 is opened until the
magnetically sensitive element detects the magnetism of the permanent magnet, the diaphragm
11 is to be returned to the set expansion and contraction position. If the back pressure depth is
smaller than that, the fact is detected by the magnetic sensitive element n immediately before the
diaphragm 11 reaches the lower limit position. When the magnetic sensitive element n detects
the magnetism from the permanent magnet 24 attached to the lower end of the diaphragm 11,
the electromagnetic pulp 8t is opened to discharge the highly compressed air into the water. If
the electromagnetic pulp 8 is opened until the sharpening sensitive element detects the
magnetism of the permanent magnet, the diaphragm 12 is returned to the set telescopic position.
Therefore, if the depth changes a little due to the expansion and contraction action of the
diaphragm 11 itself, and if the depth changes a great deal, the external water pressure and the
internal air pressure are always maintained by appropriately supplying and discharging air. Even
if the depth changes, the performance of the loudspeaker is not impaired at all. In addition,
although the magnetic sensitive element is used as a sensor in this example, it can implement
variously, without being limited to this. In addition, although the pulp control circuit is not shown
in the present example, this can be configured easily, and thus no further description is
necessary. As described above, according to the present invention, when the expansion /
contraction position of the diaphragm that divides the air chamber and the external water
introduction chamber is detected by a sensor and it is detected that the diaphragm reaches the
contraction limit position and the extension limit position In each case, the electromagnetic
knobs for air supply and exhaust are opened so that the diaphragm returns to the set telescopic
position. Therefore, according to the present invention, the pressure inside the transmitter can be
controlled so that the pressure inside the transmitter becomes equal to the external water
pressure even if the depth changes significantly, so that the diaphragm has no pressure
difference The speaker has the effect of maintaining a predetermined performance regardless of
the depth.
[0002]
Brief description of the drawings
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[0003]
The figure is a diagram showing the configuration of an example of the underwater wave
transmission device according to the present invention.
Page 9 1 ··· High compressed air tank, 3 ··· Electromagnetic for air supply (Loop, 4 · · · Air
chamber, 5 · · · External water introduction chamber, 8 · · · Electromagnetic pulp for exhaust, 11 ·
· · · · Diaphragm, 12 · · · internal pressure communication tube, 13 · · · diaphragm, 18 · · ·
transmitter.
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