JPS5830366Y2 - Bent underwater receiver - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a bent underwater receiver.

A bent underwater receiver is submerged at a desired depth underwater to receive and collect acoustic information such as ultrasonic waves, and usually has a structure as shown in FIG.

FIG. 1 is a sectional view showing an example of a conventionally commonly used bent underwater receiver.

In the figure, 1 is a pair of conversion elements for converting an acoustic signal into an electrical signal, and 2 is a diaphragm to which each of the conversion elements 1 is attached closely. .

The diaphragm 2 also functions as one electrode of the conversion element 1, and the pair of conversion elements 1 are connected in series by a wiring cable 3.

Reference numeral 4 denotes a support body that supports the two diaphragms 2 in parallel so that the surfaces on which the conversion element 1 is not attached face each other, and has a groove into which the diaphragms 2 fit. It is formed by a rubber ring.

This support 4 is protected from water pressure by tightly surrounding it with a metal pipe 5.

That is, when this bent type underwater receiver is used at a relatively deep water depth, the synthetic rubber support 4 alone cannot bend inward due to the water pressure, thereby preventing the characteristics of the underwater receiver from being affected. ing.

By molding urethane rubber 6 over each element arranged in this manner, a bent underwater wave receiver is completed.

Here, urethane rubber is used as the molding material because its acoustic impedance is approximately equal to that of water.

Further, the wiring cable 3 in which the pair of converting elements 1 are connected in series is subjected to removal prevention treatment and then taken out as a signal cable 7 to the outside.

Bent-shaped underwater receivers that have been commonly used in the past generally have the structure described in detail above, and therefore it is not only difficult to assemble them, but also difficult to miniaturize them. It also had a large number of parts.

The present invention was developed to eliminate these drawbacks, and by using an O-ring as a support, the number of parts can be reduced, the assembly work can be simplified, and the product can be made smaller. The present invention provides a bent underwater receiver.

A detailed explanation will be given below according to the drawings.

FIG. 2 is a sectional view showing an embodiment of the present invention, and 8 indicates the aforementioned O-ring.

The two diaphragms 2 are arranged in parallel and facing each other with the O-ring 8 in between, and the conversion element 1 is closely attached to the outer surface of each of them as in the conventional one.

These two conversion elements 1 are connected in series by a wiring cable 3, and then the whole is covered with a molding of urethane rubber 6, and Z! /Completed as a medium receiver.

The wiring cable 3 is taken out to the outside as the signal cable 7, but by making the portion inside the mold of the urethane rubber 6 long, there is no need for special treatment to prevent the cable from being pulled out.

With the bent type underwater receiver having the structure described above, the O-ring 8 will not be deformed by water pressure even without using a metal pipe 5 or the like for protection, and its acoustic characteristics will be adversely affected. This will no longer be the case.

Therefore, according to the present invention, parts such as metal pipes can be omitted, and the work of fitting the diaphragm into the groove of the support body, the process of preventing the signal cable from being pulled out, etc. can be omitted.
Assembly work becomes extremely easy.

Furthermore, since the spacing between the diaphragms 2 is narrowed, it is also effective in downsizing the underwater receiver.

Here, if electrical insulation is required between the diaphragm 2 and the O-ring 8, such as when a metal O-ring is used, this can be easily solved by applying an insulating paint to at least one of the contact parts. .

FIG. 3 is a sectional view showing another embodiment of the present invention, which differs from the embodiment shown in FIG. 2 only in that a ring 9 made of an insulating molded material is used as a support instead of the O-ring 8. It's different.

The thickness of the portion of this ring 9 for separating the diaphragm 2 is equivalent to that of the O-ring 8, and is sufficiently smaller than the diameter of the diaphragm 2.

The diaphragm 2 is held in a stepped notch provided in the inner wall of the ring 9.

By adopting such a structure, the diaphragm 2 and the ring 9
There is no need to separately consider electrical isolation between
Assembly workability is further improved.

Further, as described above, since the ring 9 has a small thickness, it will not be deformed by water pressure even if it is not particularly protected with a metal pipe 5 or the like.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of a conventional bent underwater receiver;
FIG. 2 is a cross-sectional view showing one embodiment of the present invention, and FIG. 3 is a cross-sectional view showing another embodiment of the present invention. 1... Conversion element, 2... Vibration plate, 3.
...Wiring cable, 4...Support, 5.
...metal ring, 6 ... urethane rubber, 7 ... signal cable, 8 ... O ring, 9 ... support body.

Claims (2)

[Scope of utility model registration request] (1) Two diaphragms, a conversion element that is attached closely to each of them and converts the mechanical vibration into an electrical signal, a wiring cable for connecting these two conversion elements in series, and the above-mentioned A ring-shaped support that supports two diaphragms in parallel with each other at a sufficiently small interval compared to the diameter of the diaphragm so that the surfaces on which the conversion element is not attached face each other, and urethane rubber that molds the entire support. A bent underwater receiver consisting of (2) The bent underwater wave receiver according to claim (1) of the utility model registration, characterized in that an O-ring is used as the support.