JPS5815397A - Underwater transmitter - Google Patents

Abstract

PURPOSE:To allow a speaker to execute a specified performance, by subjecting an internal water pressure to follow after an external water pressure even if the depth is remarkably changed. CONSTITUTION:A transmitter 18 is provided with a speaker consisting of a diaphragm 13, a magnet 17, a coil bobbin 16 and a coil 14 and driven with a signal from a cable 19. The internal part of the transmitter 18 is connected to an air chamber 4 with a link tube 12. When a diaphragm 11 is displaced up and down with an external water pressure and it is located between magneto-sensing elements 21 and 22, the pressure in the air chamber is equal to the external pressure. Thus, the pressure in the transmitter 18 is equal to the external pressure. If the diaphragm 11 is located above the element 11 or below the element 22 with a large external pressure, the internal pressure can not follow the external pressure. If the external pressure is larger, a valve 3 is controlled to supply air in a high compressed air tank and if smaller inversely, a valve 8 is controlled to blow out air externally, allowing to set the position of the diaphragm 11 to the position of an element 20.

Description

[Detailed Description of the Invention] The present invention is designed to change the air pressure inside the speaker to follow it even if the external water pressure changes, so that the diaphragm, which is the main part of the speaker, exhibits the specified performance. 1
The present invention relates to an underwater wave transmitting device configured to transmit waves.

Conventionally, sound waves were emitted into water using the expansion and contraction of objects, but although this method has good electroacoustic conversion efficiency, it does not interfere with the resonance phenomenon of electrostrictive elements or magnetostrictive elements. However, since the frequency band is narrow, wideband acoustic conversion is impossible.

For this reason, the use of speakers has recently been considered. This is because speakers are generally used exclusively in the air, but since they are capable of broadband wave transmission, it was thought that broadband wave transmission would also be possible underwater.

When using a speaker, the air pressure inside the speaker is assumed to be constant, and no particular problem occurs as long as the speaker is used under conditions of a constant water depth that is balanced with external water pressure. However, if the external water pressure and the internal air pressure of the speaker become unbalanced, the diaphragm, which is the main part of the speaker, will deform outward or inward depending on the pressure difference.
, it is clear that the desired acoustic performance cannot be obtained, apart from the mechanical strength problem.

In other words, there is no particular problem with underwater wave transmitting devices according to conventional technology that utilize speakers when used at a certain depth, but when used at other depths, the speaker The actual situation was that the acoustic performance could not be demonstrated.

Therefore, an object of the present invention is to provide an underwater wave transmitter configured so that a speaker can exhibit a predetermined performance by making the internal pressure follow the external water pressure even when the depth changes significantly. It is to serve.

For this purpose, the present invention detects changes in external water pressure using a diaphragm, and causes the internal air pressure of the system speaker to follow the external water pressure by the expansion and contraction action of the diaphragm itself. However, if the expansion and contraction position of the diaphragm deviates from the set range, This is detected and the detected output is used to supply highly compressed air to the inside of the speaker, or to exhaust the entire air inside the speaker to the outside.

Hereinafter, the present invention will be explained with reference to the accompanying drawings.

The figure shows the configuration of an example of an underwater wave transmitting device according to the present invention.

As shown in the figure, a diaphragm 11 is installed inside the pressure regulator 9, which is made of a suitable member 10 and has good pressure resistance, to ensure airtightness and water tightness. It is divided into two parts: an external water introduction chamber 5; Of these, the external water introduction chamber 5 is communicated with external water via an external water pressure introduction pipe 6, and the air chamber 4 has an air supply pipe 2 and an exhaust pipe 7, each having a TA valve 3.8 installed in the middle. The highly compressed air tank 1 can be communicated with external water via the high compressed air tank 1, and can also be communicated with the inside of the wave transmitter 18 as a speaker via the internal pressure communication pipe 12t.

The interior of the air chamber 4 and the transmitter 18 are kept at the same atmospheric pressure by the internal pressure communication pipe 12.

In this case, the transmitter 18 (shown as partially broken) is of course immersed in water before use, so
IIIJiS with good watertightness and airtightness! 5
However, a speaker is housed inside the speaker with the diaphragm 13 exposed to the outside. Permanent magnet 17
If the nine coils 14 attached to the diaphragm 13 are arranged through the coil bobbin 16t in a gap provided in a part of a good magnetic circuit, and the current from the cable 19 is caused to flow through the coils 14, The diaphragm 13 is placed in a vibrating state so that its emitting surface 15) transmits sound waves into the water.

To radiate sound waves into water, the electromagnetic pulp 3 is first opened with external water introduced into the external water introduction chamber 5, and highly compressed air is supplied to the air chamber 4 from the highly compressed air tank 1. Due to this air supply, the diaphragm 11 gradually expands and extends downward, and a permanent six stone 2 with a magnetically sensitive element 20 as a senna is printed on the bottom of the diaphragm 11.
When the electromagnetic pulp 3 is detected, the diaphragm 1iFi is set at an appropriate expansion/contraction 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 [6
1, it is clear that the diaphragm 13 can transmit sound waves into the water without undergoing any deformation. As long as the diaphragm 11 can expand and contract due to changes in depth, the external water pressure and the internal pressure of the transmitter 18 are equal, so no particular problem occurs. However, when the depth changes significantly, the expansion and contraction of the diaphragm 11 reaches its limit, and the balance between external water pressure and internal air pressure cannot be maintained, so the diaphragm 13 becomes deformed due to the pressure difference. That 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 either one of the electromagnetic pulps 3.8 in order to return the diaphragm 11 to the set expansion/contraction position.

That is, #! When the temperature increases, the diaphragm 11 gradually contracts upward, so if the magnetic sensing element 21 detects this just before reaching the upper limit position, the electromagnetic pulp 3t is opened. . This causes the diaphragm 1ltj to extend downward to allow the supply air. If the electromagnetic pulp 3 is opened until the magnetic sensing element detects the magnetism of the permanent magnet okara, the diaphragm 1
1 is where it is returned to the set extension/contraction position.

On the other hand, when the reverse pressure depth becomes smaller, this fact is detected by the magnetically sensitive element n immediately before the diaphragm 11 reaches the downward limit position. The magnetism from the permanent magnet 24 attached to the lower end of the diaphragm 11 is transferred to the magnetic sensing element n.
When detected, the electromagnetic pulp 8t opens to discharge highly compressed air into the water. Electromagnetic pulp 8 until the sharpening sensitive element detects the magnetism of the permanent magnet okara.
By opening the diaphragm 11, the diaphragm 11 is returned to the set extension/retraction position.

Therefore, if the depth changes slightly, diaphragm 1
Due to the expansion and contraction of the 1 itself, and when the depth changes significantly, the external water pressure and the internal air pressure are always equalized by appropriately supplying and exhausting air each time. Even if there is a change, the performance of the speaker will not be impaired in any way.

Note that although a magnetically sensitive element is used as the sensor in this example, various implementations are possible without being limited to this. In addition, although the pulp control circuit is not shown in this example,
This is easy to construct and requires no further explanation.

As explained above, the present invention uses a sensor to detect the expansion/contraction position of the diaphragm that partitions the air chamber and the external water introduction chamber, and when it is detected that the diaphragm has reached the contraction limit position or the expansion limit position. The electromagnetic nozzles for air supply and exhaust are opened in such a way that the diaphragm returns to the set expansion and contraction position.Therefore, in the case of the present invention, even when the depth changes significantly, the external water pressure remains constant. Since the internal pressure of the transmitter can be controlled so that the internal pressure of the transmitter is equal to that of the transmitter, and the diaphragm can vibrate without any pressure difference, the speaker can maintain the specified performance regardless of the depth. It has the effect of being maintainable.

[Brief explanation of the drawing]

The figure is a diagram showing the configuration of an example of an underwater wave transmitting device according to the present invention. Page 9 1... Highly compressed air tank, 3... Air supply electromagnetic) (loop, 4... Air chamber, 5... External water introduction chamber, 8...
Electromagnetic pulp for exhaust, 11...Diaphragm, 12...
- Internal pressure communication pipe, 13... Vibration plate, 18... Wave transmitter.

Claims (1)

[Claims] The inside of the pressure regulator is divided into two by a diaphragm into an air chamber and an external water introduction chamber, and the air chamber is connected to a high compressed air tank and external water via an air supply pipe and an exhaust pipe, each of which has an electromagnetic pulp installed in the middle. In addition, the diaphragm is exposed to the outside and communicates with the inside of the transmitter as a speaker via a communication pipe. The pressure regulator is equipped with a sensor that detects the set expansion/contraction position, contraction limit position, and expansion limit position of the 72mm diamond, and when the contraction limit position and expansion limit position are detected, the sensor is attached to the pressure regulator. An underwater wave transmitting device characterized by a configuration in which electromagnetic pulps for air supply and exhaust are opened, respectively, in order to output such an output and return the diaphragm to the set expansion/contraction position.