JPS6042384Y2 - Underwater transducer - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of underwater transducers (hereinafter referred to as transducers) used in underwater acoustic equipment such as sonar. The structure has been designed to significantly improve the retention function by measuring the amount of water.

Conventionally, the structure of this type of transducer is that, as shown in the cross-sectional view of FIG. It has a structure.

If the transducer is to be held vertically or horizontally underwater, the cable 1 should be aligned with the support rod 7, and the cable 1 should be held with a string, etc. It was fixed with

However, in this method, the force exerted on the transducer by the fluid and the force due to the transducer's own weight are concentrated near the joint between the cable 1 and the tapered part 5, resulting in damage to the joint and damage to the inside of the transducer. Not only is there a risk of water infiltration, but the joints are easily bent, making them extremely unstable.
In addition, it requires a lot of time and effort to install and remove, and has various drawbacks such as poor workability.

The present invention eliminates these drawbacks, and the structure thereof will be described below with reference to embodiments and usage examples shown in FIGS. 4 to 9.

In the sectional view of FIG. 4, the same reference numerals as in the conventional one indicate the same parts.

Reference numeral 9 denotes a recessed portion having a holding function according to the present invention, and is provided on the outside of the core 4 made of metal, hard plastic, or the like.

FIGS. 5 and 6 show examples of cross-sectional views of such recessed portions. FIG. 5 shows a case where the recess is provided in an annular shape, and FIG. 6 shows a case where it is provided in a parallel plane.

FIG. 7 shows an example of a case where the transducer is held using such a recessed part, where 7 indicates a support rod and 10 indicates a mounting fitting.

Since there is a vertical core inside this concave part, the transducer can be held vertically and firmly, and since it is concave, there is no fear of it falling out of the metal fitting, and it can be easily attached and removed by operating the metal fitting 10. Since force is not concentrated at the joint between the cable 1 and the tapered portion 5, there is no risk of damage.

Here, in the molding material, at least the vibration surface portion of the vibrator (piezoelectric) is made of a rubber-like flexible material.

This is because the above-mentioned flexible materials have an acoustic impedance close to that of water, so that there is very little reflection of sound waves on surfaces that come into contact with water, making them suitable for efficient electrical/acoustic conversion.

FIG. 8 and FIG. 9 are side views of an application example in which such a recessed portion is utilized.

Fig. 8 shows an example in which a protective fitting 11 is attached to the transducer, and Fig. 9 shows an example in which a recessed part 9' is provided at the bottom of the transducer to allow the transducer to be stably suspended underwater. This is an example in which a weight 12 is attached.

In the present invention, as described above, a part of the core made of a vertical material is inserted and fixed inside the vibrator, a molding material of a flexible material is formed on at least the vibrating surface of the vibrator, and the core is A concave part is provided in the part corresponding to the exposed part from the vibrator, and the external force is held and supported by this concave part.
It is possible to maintain a strong transducer in a state where highly efficient electrical/acoustic (or inverse) conversion is possible with an extremely simple structure.

As an application, holding fittings, weights, etc. can also be firmly attached vertically.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional transducer, Figs. 2 and 3 are side views of the conventional transducer mounted on a support rod, and Fig. 4 is a transducer with a concave portion 9 of the present invention. 5 and 6 are cross-sectional views of the recessed portion 9, FIG. 7 is a side view of an example of use when holding the transducer of the present invention, and FIG. 8 is a cross-sectional view of an embodiment of the transducer. 9 is a side view in which a protective metal fitting is attached using the concave portion, and FIG. 9 is a side view in which the concave portion 9' is provided at the lower part of the transducer. In the figure, 1... Cable, 2... Piezoelectric, 3... Spacer, 4... Core, 5
, 6...Mold material, 7... Support rod,
8... String, 9.9'... Concave part, 1
0...Mounting with metal fittings, 11...Protective metal fittings, 12...Weight.

Claims (1)

[Scope of utility model registration request] A part of the core made of vertical material is fixed inside the vibrating body,
At least the vibrating surface corresponding portion of the vibrating body is covered with a molding material made of a rubber-like flexible material, and a recessed portion is provided in the corresponding portion of the core portion exposed from the vibrating body, and this recessed portion is An underwater transducer characterized by being mechanically held.