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JPS6180996

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DESCRIPTION JPS6180996
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater wave transmitter capable of detecting the balance between the pressure inside and
outside of the water wave transmitter and the water depth. BACKGROUND OF THE INVENTION
Underwater wave transmitters are usually suspended from ships and towed at a depth of 0 to
1000 m. In this way, sound waves are transmitted from the underwater transmitter suspended
and towed at a water depth of 0 to iooom to search for seabed structures, obstacles, and the like.
However, since the water pressure changes as the depth increases or decreases and a pressure
difference is generated in the pressure applied to the sound wave transmitting member in the
underwater wave transmitter, the acoustic characteristics significantly change, so that the
underwater wave transmitter is The purpose can not be achieved. Also, although it is necessary
to measure the depth from the point of adjusting the strength and depth of the underwater
transmitter, there have been problems such that this can not be done. As a solution to this
problem, JP-A-57-205799 and JP-A-58-517593 are disclosed, but in any case, the external water
pressure and the pressure in the water transmitter are balanced by high pressure air. To prevent
changes in acoustic characteristics. This will be described in more detail with reference to FIG. 2.
The diaphragm 1 is freely supported by the bellows 9 fixed to the support frame 7. When a
signal current is supplied to the voice coil 5 wound around the bobbin 2, the voice coil 3 is
driven by the magnetic circuit composed of the center ball 4 and the permanent magnet 5 and
the yoke 6, whereby the bobbin 2 drives the diaphragm 1 Sound waves are sent out to the water
through the acoustic oil 11 and the acoustic rubber 10. Also, the periphery of the magnetic
circuit is filled with air or gas' and sealed by a housing 8. That is, the pressure in the housing 8 is
adjusted by the pressure reducing valve 14 according to the water pressure that changes
according to the depth, and the internal and external pressures are balanced, so that the pressure
does not substantially act on the diaphragm 1 The electroacoustic effect by the water depth is
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kept constant. However, because the pressure inside and outside the case is actually balanced,
and it is not possible to confirm whether a predetermined sound wave has been delivered into
the water, and because it is not possible to confirm the depth, the reliability as an underwater
wave transmitter is It is low, the fact is that technological development on this is urgent.
SUMMARY OF THE INVENTION The present invention has been made in view of the abovementioned circumstances, and an object of the present invention is to provide an underwater
wave transmitter capable of detecting the pressure balance and the water depth inside and
outside the housing. [Summary of the Invention] That is, according to the present invention, in an
underwater wave transmission device in which the pressure inside and outside the case is
balanced by high pressure air, a pressure detector is provided in the middle of a pipeline
communicating with the inside of the case and outside water. The present invention is
characterized in that the pressure in the case and the external water pressure are simultaneously
detected, the pressure balance inside and outside the case is detected, and the water pressure
detected at the same time is used to detect the depth.
[Embodiment of the Invention] One embodiment of the present invention will be described in
detail below. In FIG. 1, the same parts as in the prior art described in FIG. 2 are indicated by the
same reference numerals, and the description thereof is omitted. In the figure, reference numeral
16 denotes a pressure detector provided in the middle of a conduit 17 communicating with the
inside of the housing 8 and the water. A cover 18 is provided to protect the pressure detector 16.
In this embodiment configured as described above, the pressure H! Is changed according to the
water pressure (external pressure) that changes according to the depth. The air or gas 12 whose
pressure is adjusted by the fJ device 15 is injected into the housing 8, and the diaphragm 1
vibrates in a substantially pressure-free state through the acoustic oil 11 and the acoustic rubber
10. Sound waves are sent out into the water. During the sound wave exit, the pressure detector
16 constantly detects the pressure in the housing 8 and the water pressure (external pressure)
simultaneously via the conduit 17, and whether the pressure inside and outside the housing is
balanced by the differential pressure To detect At the same time, the water pressure (external
pressure) is also detected, so the depth is calculated reversely from this water pressure to know
the water depth. [Effect of the Invention] As described in detail above, according to the
underwater wave transmission device according to the present invention, there is provided an
underwater wave transmission device which injects high pressure air into the case to balance the
pressure inside and outside the case against water pressure. The pressure detector is provided in
the pipeline communicating with the sensor, and at the same time the air pressure in the case
and the external water pressure are detected to detect the differential pressure, so the pressure
balance inside and outside the case adapted to the depth is known It was possible to improve the
reliability as a submersible transmitter. In addition, the water pressure detected by the pressure
detection tOB device can know the depth at that time, and has a remarkable effect on the actual
lunar surface.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view of an underwater wave transmitter according to an
embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a conventional underwater wave transmitter. 01:
diaphragm, 2 ... bobbin, 3 ... voice coil, 4 ... center ball, 5 ... permanent magnet, 6 ... yoke, 7 ...
support frame, 8 ... · · Housing, 9 · · · Bellows, 15 · · · Pressure regulator, o 1 Figure fz + +?
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