JP2561086Y2 - Small depth transducer - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a small-sized deep transducer, and more particularly to a small-sized small-sized transducer used for downsizing.

[Conventional technology]

Transducers that operate in the depth range exceeding several hundred meters and even several thousand meters require measures to protect the transducer, especially against applied water pressure. Transducers that transmit sound waves into the sea and receive sound waves received from the sea are arranged to form a predetermined directivity, and are housed in the outer case of a durable watertight container. However, in order to improve sound transmission, a part of the outer casing that transmits and receives sound waves is an acoustic window using so-called acoustic rubber that is similar to seawater and acoustic impedance. It is operated in a state where it is connected to a window. Therefore, the water pressure at a deep depth presses the acoustic window with low mechanical strength, and the arrangement vibrator in contact with this acoustic window is affected by a strong force due to the external water pressure and disturbs the arrangement state, and in extreme cases it is damaged. It is possible. On the other hand, countermeasures for eliminating such an influence due to the external water pressure have been conventionally taken.

FIG. 3 is a cross-sectional view of a conventional small-sized transducer for deep depth. In the conventional example shown in FIG. 3, an elastic body having a larger sectional area than the vibrating element is joined to one end face of the electrostrictive vibrating element perpendicular to the vibration direction, and the elastic body is joined to the other end face. In the case of using a so-called bolt-fastened Langevin type vibrator in which the whole is bolted, a cylindrical piezoelectric vibrating element 21a, 21b is sandwiched between two elastic bodies 22a, 22b, and the whole is bolted. A plurality of vibrators 2 having the above-described configuration are joined to an acoustic window 3, which forms a part of a housing 1 having a watertight structure. It is attached with keeping. An electronic device 9 for housing electronic components such as a preamplifier is provided inside the housing 1.

Behind the vibrator 2, a back plate 6 made of a lightweight aluminum alloy or the like that withstands pressure due to water pressure at a deep depth and uses a small amount of deflection and is lightweight is attached to the housing 1 with bolts 7. A spacer 5 made of an epoxy resin or the like that withstands the pressure of water pressure and has electrical insulation properties,
Part of the vibrator 2, that is, the vibrators 21 a and 21 b and the elastic body 22 b are fitted into the holes formed by the spacers 5, and the vibrator 2 is acoustically provided between the spacer 5 and the vibrator 2. It has a structure in which a cushioning material 4 using onion skin paper or the like that freely supports and withstands pressure due to deep water pressure is interposed.

By adopting such a structure, the vibration, shock and water pressure transmitted from the device in which the transducer is attached to the vibrator 2 are not directly transmitted to the vibrators 21a and 21b, but the cushioning material 4 and the elastic members 22a and 22b And can satisfy vibration resistance, impact resistance and water pressure resistance. Further, the vibrator 2 at the time of applying the water pressure moves almost linearly between the spacers 5 and the movement is sealed by the back plate 6 having high rigidity. Stable acoustic performance can be obtained from deep to deep.

Furthermore, since the periphery of the electrodes of the vibration elements 21a and 21b is a spacer 5 using an epoxy resin having high electrical insulation, insulation between the electrodes during high-power transmission can be prevented.

[Problems to be solved by the invention]

The conventional small-sized transducer for deep depth described above receives the water pressure received through the acoustic window by the spacer and the back plate,
Although the arrangement of the vibrators is normally maintained, the reduction of the length A from the front surface of the acoustic window to the plane of the back plate 6 is limited by itself, and the back plate increases as the operation depth increases. It is necessary to increase the thickness in accordance with the generated stress and the amount of deflection of the back plate, and it is difficult to reduce the size and weight.

[Means for solving the problem]

The small-sized transducer for deep depth according to the present invention incorporates a plurality of transducers arranged to form a predetermined directional characteristic, and is connected to these transducers to enable transmission and reception of sound waves through an elastic body. In a small-sized deep transducer for operating at a deep depth having a casing of a watertight structure provided with a window, at least a part of each of the plurality of transducers is fitted without disturbing an arrangement state, and A honeycomb-shaped bottomed hole having a bottom for pressing an elastic body and a part of the surface of the housing against the surface of the acoustic window is formed, and is fixed to the housing and has a depth to be received through the acoustic window. A back plate coated with a resin member having electrical insulating properties inside the honeycomb-shaped bottomed hole while suppressing the deflection of the plurality of front and rear vibrators due to the application of the water pressure at the depth below a set value, A back plate and a cushioning material interposed between the plurality of vibrators. Made. Further, it has a configuration in which a part of the housing is formed as a structure having a function equivalent to the back plate.

〔Example〕

Next, the present invention will be described with reference to the drawings. First
FIG. 2 is a cross-sectional view of the first embodiment of the present invention. In the embodiment shown in FIG. 1, the housing 1a, the vibrator 2, the acoustic window 3, the cushioning material 4, and the back plate 6a for holding the vibrator 2 in a normal arrangement state even when a deep depth is applied. It comprises a back cover 8, an electronic device 9, and a cable 10, in which the cushioning material 4 and the back plate 6a
Is a configuration directly related to the present invention, and the other configuration is the same as that of the conventional example shown in FIG. 3 except for a partial modification of the housing 1a due to the change of the back plate 6a. Description is omitted.

On the surface of the elastic body 22a of the vibrator 2 opposite to the surface facing the acoustic window 3, a cushioning material 4 made of onion skin paper or the like that supports acoustically freely and withstands pressure due to water pressure at a deep depth is provided. The back plate 6 made of a high-strength aluminum alloy or the like, which has a small amount of deflection and withstands a pressure caused by water pressure at a deep depth, is provided on a surface opposed to the elastic body 22b. This back plate 6a is
Is fixed with bolts 7.

As shown in FIG. 1, the back plate 6a is fitted into a concave portion of the surface of the housing 1a in contact with the acoustic window 3 to press the elastic bodies 22a, 22b and a part of the surface of the housing 1a against the surface of the acoustic window 3. A honeycomb-shaped bottomed hole having a bottom is formed, and a part of the vibrator 2 is freely inserted into the honeycomb-shaped hole of the back plate 6a. The inner surface of the honeycomb-shaped hole provided on the back plate 6a is coated with a resin coating having an electrical insulating property of about 100 μm thick to withstand a voltage of about 2000 V generated between the transducer electrodes during high-power transmission. ing.

The back plate 6a is provided with a honeycomb-shaped bottomed hole,
There is an increase in the amount of flexure caused by an increase in the stress generated at deep pressure and a slight decrease in the rigidity. For this reason, the thickness is about 1.3 times as compared with the conventional one, but since a part of the vibrator is inserted into the honeycomb-shaped hole of the back plate 6a, up to the space of the conventional back plate 6a Since it becomes unnecessary and the back plate 6a also functions as a conventional spacer, a spacer becomes unnecessary, and a remarkable reduction in size and weight is ensured.

FIG. 2 is a cross-sectional view of a second embodiment of the present invention. A housing 1b in which the back plate 6a in the first embodiment of FIG. 1 is integrated.
As a result, the back plates 6, 6a and the bolt 7 become unnecessary,
Further, the size and weight can be reduced.

[Effect of the invention]

As described above, the present invention provides a bottom plate having a honeycomb-shaped bottom formed with a slight increase in thickness on a back plate that receives water pressure received through an acoustic window of a transducer, and Apply a resin with high electrical insulation to the inner surface of the hole and insert a part of the vibrator into the honeycomb hole of the back plate for operation, or operate a part of the housing with the honeycomb hole. By forming the back plate having the same, there is an effect that the conventional spacer is not required while maintaining the strength of the back plate against water pressure, and the space of the conventional back plate can be significantly reduced or reduced to be extremely small and lightweight.

In the case of FIG. 2, the effect of reducing the size and weight can be reduced to about 70% of the conventional space and about 90% of the conventional mass.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a second embodiment of the present invention, and FIG. FIG. 1, 1a, 1b ... housing, 2 ... vibrator, 3 ... acoustic window, 4 ...
... cushioning material, 5 ... spacer, 6, 6a ... back plate, 7 ... bolt, 8 ... back cover, 9 ... electronic equipment, 10 ... cable, 21
a, 21b: Vibrating element, 22a, 22b: Elastic body.

Claims (2)

(57) [Scope of request for utility model registration] 1. A watertightness which incorporates a plurality of vibrators arranged to form a predetermined directional characteristic, and is provided with an acoustic window which is joined to these vibrators and enables transmission and reception of a sound wave via an elastic body. In a small-sized deep transceiver that operates at a deep depth with a housing having a structure, at least a part of each of the plurality of vibrators is inserted without obstructing an arrangement state, and the elastic body and the housing Forming a honeycomb-shaped bottomed hole with a bottom part that presses a part of the surface against the surface of the acoustic window, fixed to the housing and received through the acoustic window, a plurality of front and rear by deep water pressure application A back plate coated with a resin member having an electrical insulating property inside the honeycomb-shaped bottomed hole while suppressing the deflection of the vibrator to a set value, and the back plate and the plurality of vibrations And a cushioning material interposed between the children. Deep depth for small transducer. 2. The small transducer for deep depth according to claim 1, wherein a part of said housing is formed as a structure having a function equivalent to said back plate.