JPH0354474Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a suspended wave receiver that is used by being suspended in the sea from a ship or the like.

[Prior art]

An example of a conventional hanging type receiver of this kind is shown in FIG.

In the figure, reference numeral 1 denotes a hanging type wave receiver, and this hanging type wave receiver 1 supports a disc-shaped diaphragm 3 with a U-shaped cross section on the peripheral edge of a disk-shaped diaphragm 3 with a piezoelectric element 2 bonded to one side. The metal fitting 4 is supported by a support rubber 5 fixed to the inner peripheral surface thereof, and a sealed air chamber 6 is formed by the diaphragm 3 and the support metal 4, and a connecting cable 7 is connected to the piezoelectric element 2 and the diaphragm 3. It is constructed by molding a water-resistant member 8 over the entire outside.

When a sound wave enters the suspended wave receiver 1 from outside underwater, the diaphragm 3 vibrates, and the piezoelectric element 2 is distorted accordingly, thereby generating an output voltage. This output voltage is led via a connecting cable 7 to a preamplifier 9 installed near the suspended receiver 1. After being amplified by the preamplifier 9, the output voltage is passed onboard the ship via a connecting cable 10. The data is sent to a processing device (not shown) installed in a storage facility, etc.

The preamplifier 9 is formed of a housing 11 and a support base 12 that fits into the housing, and is housed in an air chamber that is sealed by attaching an O-ring 13 to the fitting portion of the two. The entrance and exit of the connection cables 7 and 10 connected to the preamplifier 9 is provided on the support base 1.
Fit the gasket 14 into the recess provided in 2,
This is sealed by tightening it with a screw or the like via a pressing plate 15.

Furthermore, since the hanging type receiver 1 is suspended in the underwater current, it has a structure in which a weight 17 is attached by a connecting string 16 in order to stabilize its posture.

However, in such a conventional structure, it is difficult to connect the connection cable, to ensure watertightness of the connection cable, and to ensure watertightness between the casing that houses the preamplifier and the support base.
Because it requires work such as connecting weights, the work is complicated and requires a lot of assembly man-hours, and there are many parts.
It has the drawbacks of being expensive and having low reliability.

In addition, since the weights are connected by connecting strings and suspended in the ocean current, there is a disadvantage that the acoustic performance of the receiver is degraded by the noise generated by these vibrations. If the wave device, weight, and preamplifier are stored with the three components connected by a connecting cable, there is also the drawback that the connecting cable is easily damaged.

[Purpose of invention]

The present invention was made to solve the above-mentioned drawbacks of the conventional technology, and can reduce the number of assembly steps and parts, is inexpensive, improves reliability, and reduces acoustic performance. The object of the present invention is to obtain a small and lightweight hanging type wave receiver that can prevent such problems.

[Structure of the idea]

In order to achieve the above-mentioned object, the present invention supports the peripheral edge of the diaphragm on the inner periphery of a support fitting that also serves as a weight, and also installs a preamplifier in the air chamber formed by the diaphragm and the support fitting. It is stored and fixed.

〔Example〕

Fig. 2 is a side sectional view showing an embodiment of the hanging type receiver according to the present invention, and Fig. 3 is a front sectional view. The wave generator 18 is configured as follows. That is, 19 is a disc-shaped piezoelectric element, and the piezoelectric element 19 is adhered to one side of a disc-shaped diaphragm 20, and the peripheral edge of this diaphragm 20 has a circular side surface and a square cross-sectional shape. It is supported by support rubber 22 fixed to the inner circumferential surface of a letter-shaped support fitting 21.

This support fitting 21 also serves as a weight for the hanging wave receiver 18, and is formed to have a thick overall wall thickness to obtain the necessary weight. A preamplifier 24 made of a thick film IC is attached to the wall surface of the air chamber 23 facing the diaphragm 20.

A connecting cable 25 is connected to the piezoelectric element 19 and the diaphragm 20, and the diaphragm 20 and the preamplifier 24 are connected by a wiring material 26, and the output from the preamplifier 24 is connected to the piezoelectric element 19 and the diaphragm 20. It is now possible to take it outside.

27 is a water-resistant member, and the entire outside except for the air chamber 23 is molded with this water-resistant member 27.

In the hanging type receiver 18 having such a configuration, when a sound wave is incident from the outside underwater, the diaphragm 2
0 vibrates, and the piezoelectric element 19 is distorted in response to this vibration, thereby generating an output voltage. This output voltage is led to the preamplifier 24 in the air chamber 23 by the wiring material 26, and after being amplified by the preamplifier 24,
The data is sent via a connection cable 25 to a processing device (not shown) installed on a ship or the like.

In the above-mentioned embodiment, the air chamber 23 is formed in the center of the support fitting 21, but the embodiment shown in FIGS.
As shown in the figure, if the thick wall portion 21a is formed on the lower side of the support fitting 21 and the air chamber 23 is eccentrically upwardly moved, the center of gravity will be located at the lower part of the hanging type receiver 18.
It can maintain a more stable posture when suspended in underwater currents.

[Effect of idea]

As explained above, the present invention has a structure in which the support metal fitting that supports the diaphragm to which the piezoelectric element is bonded also serves as a weight, and the preamplifier is housed and fixed in the air chamber formed by the support metal fitting and the diaphragm. This simplifies the work of connecting cables and keeping the cables watertight and the preamplifier watertight, and significantly reduces assembly man-hours. etc. are not required, the number of parts is reduced, it is small and lightweight, and can be manufactured at low cost, and at the same time, reliability is improved.

In addition, since no weights or connection strings are used, there is less noise generated when suspended underwater, preventing deterioration of acoustic performance, and since the whole is integrated, there is no need to damage the connection cable during storage. This has the effect of not only reducing the number of accidents, but also making it easier to handle such things as suspending the vessel into the sea and lifting it up.

Therefore, it can be used as a wave receiver that is suspended from a buoy dropped from a ship or aircraft, and that is required to be small, lightweight, and used at great depths.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a hanging example of a conventional hanging type receiver and preamplifier, FIG. 2 is a side sectional view showing an example of a hanging type receiver according to the present invention, and FIG. The figure is a front sectional view of the same, FIG. 4 is a side sectional view showing another embodiment, and FIG. 5 is a front sectional view of the same. 18... Hanging type receiver, 19... Piezoelectric, 20
...Diaphragm, 21...Support fitting, 22...Support rubber, 23...Air chamber, 24...Preamplifier, 25...
... Connection cable, 26 ... Wiring material, 27 ... Water-resistant member.

Claims (1)

[Claims for Utility Model Registration] 1. The peripheral part of a diaphragm to which a piezoelectric element is bonded is supported on the inner peripheral surface of a support fitting whose cross section is U-shaped and also serves as a weight, and the diaphragm is formed by this support fitting and the diaphragm. A hanging type wave receiver characterized in that a preamplifier electrically connected to a diaphragm is housed and fixed in an air chamber, and the entire outside is molded with a water-resistant material. 2. The hanging type wave receiver according to claim 1, which is a utility model registration, characterized in that the lower part of the support fitting is thickened and the air chamber is eccentrically upward.