JPH0230474B2 - KOHANISUICHUTANCHOCHOONPASOJUHAKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the structure of a transducer used in an underwater detection device that detects underwater in a wide range of directions.

As this type of transducer, the applicant filed a patent application in 1970-
No. 79152 was provided. This transducer is constructed by stacking a large number of vibrators 1 arranged in an annular manner in a plurality of stages, as shown in FIGS. The transducer 1 is arranged on the transducer liners 2 and 3, and the transducer liners 2 and 3
Each fixes the annularly arranged vibrators 1, and at the same time acoustically insulates the stacked vibrators from each other.

After the vibrators 1 are arranged as described above, the upper lid 6
and the lower cover 7. The upper cover 6 and the lower cover 7 fix the laminate of the vibrator 1 and the vibrator liner 2 by struts 8 and bolts 9, and the front surface of the sound wave emitting surface of the vibrator 1 is molded with a molding material 5. The molding material 5 is made of a sound-transmitting material such as urethane rubber, and ultrasonic waves are transmitted and received through this sound-transmitting material. The transmitted and received ultrasound signals are synthesized by a plurality of annularly arranged transducers to form a directional beam on the horizontal plane, and stacked transducers are synthesized to form a directional beam in the vertical plane. It is formed.

In the above-mentioned wave transducer, the vibrator is fixed by vertical pressure applied by an upper cover 6 and a lower cover 7. Therefore, when a pressing force is applied from the outside to the radiation surface of the vibrator 1, the arrangement of the vibrator 1 tends to be distorted in the inner diameter direction. Therefore, if the above-mentioned transducer is directly exposed underwater and used, the transducer arrangement will be distorted by water flow or water pressure, so it must be housed in a dome and transmit and receive ultrasonic signals through the dome. It won't happen.

The present invention provides a transducer that can be used by being directly exposed underwater, without being housed in a dome like the above-mentioned transducer. That is, in FIG. 1, the holder is placed on the side opposite to the radiation surface of the vibrator 1 so that the vibrator arrangement will not be distorted even if the radiation surface of the vibrator 1 receives a pressing force from the outside. .

FIG. 3 shows a schematic cross section of a transducer embodying the present invention, and the same numbers as in FIG. 1 or 2 indicate the same parts. In FIG. The arrayed items are stacked in multiple stages,
It is held between an upper lid 6 and a lower lid 7. The upper lid 6 and the lower lid 7 are fixed via a hollow cylindrical column 10. The cylindrical column 10 is set so that its outer diameter R is slightly smaller than the annular arrangement diameter R' of the vibrator 1 (FIG. 2). Then, the cylindrical column 10 and the vibrator 1
A sound insulating material 11 is interposed between the oscillator 1 and the cylindrical column 10 so that the pressing force applied from the outside to the cylindrical column 10 is prevented from distorting the arrangement of the oscillator 1. There is. In this case, the sound insulating material 11 needs to have sufficient sound insulating effect so that the vibrations of the vibrator 1 are not transmitted to the cylindrical column 10, and the material must not be deformed by the pressing force acting on the vibrator 1. . Conventionally, as sound insulating materials, for example, cork, urethane foam, sponge, etc. have been used. In order to obtain a sufficient sound insulation effect using these materials, a relatively large thickness is required. However, since these sound insulating materials produce a sound insulating effect due to the bubbles formed in the material, as the thickness of the material increases, the flexibility increases and the material tends to deform under pressure. Therefore, if such a material is used as the sound insulation material 11, the sound insulation material 11 will be damaged by the pressing force acting on the vibrator 1.
may be compressed and deformed, causing distortion in the arrangement of the vibrator 1. Therefore, in this invention, the sound insulation material 1
1 into a multiplexed structure as shown in FIG.
That is, in FIG. 4, metal and other materials 1
A multilayer structure with 2a, 12b, and 12c is formed,
For example, 12a is cork, 12b is copper, and 12c is sponge or rubber, which are non-conductive materials for sound waves that have significantly different sound wave propagation characteristics than copper 12b, and each has a thickness of about 1 mm. Thin material is used. Therefore, when creating a multilayer structure made of these materials, a metal material is used for one of the layers,
In addition, since the other materials such as cork and sponge are extremely thin, almost no dimensional distortion occurs even if a relatively large stress force is applied in the multilayer direction of each material. Furthermore, it is known that when a multilayer structure is made of different materials such as metal and cork or sponge, the sound insulation effect becomes extremely large. Therefore, when the sound insulating material 11 shown in FIG. 3 has the multilayer structure shown in FIG. It is possible to obtain a sound insulation effect.

FIG. 5 shows a specific example in which the sound insulating material 11 is arranged around the cylindrical column 10. In FIG. 5, the sound insulating materials 11 are composed of the laminate shown in FIG. 4, and are arranged on the circumferential surface of the cylindrical column 10 at regular intervals. The legs 14 of the vibrator 13 disposed on the vibrator liners 2 and 3 are supported in contact with the sound insulating material 11.

As described above, according to the present invention, the structure is configured to support the pressing force acting on the vibrator using a sound insulating material that has a sufficient sound insulation effect and does not deform even under a relatively large pressing force. has been done. Therefore, as shown in FIG. 1 or 3, by simply molding the front surface of the radiating surface of the transducer 1 with a sound wave transmitting material 5, the transducer can be directly exposed underwater to transmit and receive ultrasonic waves. Can be done. Therefore, it is possible to downsize the entire transducer and the water flow resistance can be reduced even when it is installed on the bottom of a ship.

[Brief explanation of drawings]

1 and 2 show a conventional device, and FIG. 3 shows an embodiment of the present invention. FIG. 4 shows a specific example of the sound insulating material in FIG. 3, and FIG. 5 shows an example of the arrangement of the sound insulating material.

Claims (1)

[Claims] 1. Vibrators are arranged in an annular manner on a vibrator liner, which is an annular holding ring made of a sound insulating material, and the vibrator group arranged in an annular manner and the vibrator liner are stacked in multiple stages. In an ultrasonic transducer, the front surface of the radiating surface of the vibrator is molded with a sound wave transmitting material, and at the same time, a metal material is molded on the opposite side of the radiating surface of the vibrator, and the propagation of sound waves is A sound insulating material formed by laminating sound wave non-conducting materials with greatly different characteristics is arranged, and the sound insulating material supports the vibrator against the pressing force acting on the radiation surface of the vibrator. An ultrasonic transducer for wide range underwater detection characterized by the following configuration.