JPH0531498U - Underwater receiver - Google Patents

Abstract

(57) [Summary] [Objective] To provide an underwater receiver with a small voltage drop by increasing the electrode area by using a metal case as the underwater receiver case, resulting in a reduction in seawater resistance. A metal case 13 having an open top surface, a plurality of protrusions 14 provided on the bottom surface of the metal case 13, and a through hole 1 formed on the printed circuit board 11 corresponding to the protrusions 14.
5, a means for joining the through hole 15 and the protrusion 14 by welding, and a molding agent 12 which is filled in the case from the open surface of the metal case 13 and molds the piezoelectric material 6, the printed circuit board 11 and the like. Underwater wave receiver.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of an underwater wave receiver for receiving a sound wave emitted in the sea and converting the sound wave into an electric signal.

[0002]

[Prior art]

 Conventionally, an apparatus of this type is disclosed in Japanese Patent Laid-Open No. 52-127709. An example thereof is shown in FIGS. 4, 5, and 6.

FIG. 4 is a block diagram of a signal transmission system between an underwater receiver and a signal receiving device, FIG. 5 is a top view of the underwater receiver, and FIG. 6 is a side view of a similar underwater receiver. It is a figure.

In FIG. 4, reference numeral 41 denotes an underwater wave receiver main body whose casing is surrounded by an insulator, and 3 is an electrode plate connected to the ground side of the underwater wave receiver main body and the signal receiving device 4. 2 is a transmission cable having a watertight structure for transmitting signals between the underwater receiver 41 and the signal receiving device 4. In such a configuration, the underwater receiver 41 is connected via the transmission cable 2. Then, the direct current is supplied from the signal receiving device 4 and the output signal of the underwater wave receiver 41 is also transmitted to the signal receiving device 4 via the transmission cable 2.

In the present transmission system, as a return path for signal transmission, seawater is passed through the electrode plate 3 connected to the underwater wave receiver 41 and the electrode plate 3 connected to the signal receiving device 4.

5 and 6 are a top view and a side view showing the structure of the underwater wave receiver.

In the figure, reference numeral 6 denotes an electrode material for taking out a generated voltage by piezoelectric electrons, which is coated on both surfaces by vapor deposition or the like, and is surface-bonded to the surface of the diaphragm 7.

The piezoelectric electrons 6 and the vibration plate 7 are adhered to a cylindrical support case 8 at their peripheries, so that the piezoelectric electrons 6 and the vibration plate 7 are supported on the circumference and are provided between the support case 8 and the vibration plate 7. A closed air chamber 9 is formed.

On the printed circuit board 52, the support case 8 is attached with an adhesive 53, and an electronic circuit 10 for amplifying piezoelectric output from piezoelectric electrons, a transmission cable 2 for transmitting a signal, an electrode plate 3, etc. are mounted. It

Since these members are used in the sea, they are mounted on the case 51 and molded by the water resistant member 12.

[0011]

[Problems to be solved by the device]

 However, in the above-mentioned conventional structure, it is difficult to increase the area of the electrode plate attached to the underwater wave receiver, and the resistance value between the electrode plate and seawater increases, causing a voltage drop in the power supply. was there.

[0012] Further, there is a problem in that there is a risk of water leakage or the like at the joint between the electrode plate and the water resistant member, and a mold die is required in the molding process using the water resistant member, which complicates the assembly process and leads to mass production. There was a problem that it was not suitable.

The present invention has been made in order to solve such a problem. The electrode plate attached to the outside is made into a metal case for the entire underwater wave receiver case, thereby increasing the electrode area. It is an object of the present invention to provide an inexpensive underwater wave receiver that has a low resistance to seawater, reduces the voltage drop of the power supply, is free from the risk of water leakage, and has good workability.

[0014]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a diaphragm having surface-bonded piezoelectric electrons, a support casing supporting the diaphragm and a sealed air chamber, and an electronic circuit. In a submersible wave receiver that is integrally molded with a printed circuit board for mounting the support case and fixing the support case, a metal case with an open top surface, a plurality of protrusions provided on the bottom surface of the metal case, and the protrusions corresponding to the protrusions are provided. A through hole formed on the printed circuit board, means for joining the through hole and the projection by welding, and a molding agent filled in the case from the open surface of the metal case to mold piezoelectric, printed circuit board, etc. This is a submarine wave receiver.

[0015]

[Action]

 According to the present invention having the above-described structure, the piezoelectric case and the receiver housing on which the printed circuit board is mounted are made of a metal member, and the ground of the printed circuit board is provided through a plurality of protrusions provided at the bottom of the metal case. By grounding to the ground and configuring the metal case as an electrode plate, the electrode area is increased, and as a result, seawater resistance in the sea is reduced and voltage drop is suppressed.

[0016]

【Example】

 FIG. 3 is a block diagram showing a transmission system between the underwater receiver and the signal receiving device of the present invention, and FIGS. 1 and 2 are a top view and a side view of the underwater receiver.

The same components as those of the conventional technique will be described with the same reference numerals.

In FIG. 3, reference numeral 1 is an underwater wave receiver in which a piezoelectric electron and an electronic circuit are housed in a metal casing, 4 is a signal receiving device 2, and a signal between the underwater wave receiving device 1 and the signal receiving device 4. The transmission cable 3 for transmission is an electrode plate provided in the signal receiving device, and is electrically connected to the casing of the underwater receiver 1 through the seawater 5.

In FIG. 1, reference numeral 6 is surface-bonded to the vibration plate 7 by piezoelectric electrons and fixed to the support case 8.

Reference numeral 10 denotes an electronic circuit for amplifying the electric signal from the piezoelectric electrons 6 to a predetermined value, which is mounted on the printed board 11.

Reference numeral 11 is a printed circuit board on which the electronic circuit 10 is mounted, and is provided with a plurality of through holes 15 that engage with the holes through which the support case 8 penetrates and the protrusions 14.

The output signal of the electronic circuit 10 is transmitted to the signal receiving device 4 via the transmission cable 2.

Reference numeral 12 denotes a water resistant member filled in the metal case 13 for using the undersea wave receiver underwater.

Reference numeral 13 is a metal case having a protrusion 14 on the bottom surface. The through-hole 15 provided on the printed circuit board 11 and the protrusion 14 are engaged with each other and are connected by soldering or the like so that the metal case is electrically connected. Are electrically connected.

Reference numeral 14 is a protrusion provided integrally with the metal case 13.

When the present apparatus configured as described above is used in the sea, the acoustic waves in the sea are received by the piezoelectric electrons 6 and converted into electric signals by the electronic circuit 10 and then amplified to a predetermined voltage, and the transmission cable 2 is used as the outward path. The signal is transmitted to the signal receiving device 4 via the signal receiving device 4.

On the return path, from the electrode plate 3 provided on the signal receiving device 4 through the seawater 5 to the underwater wave receiver metal case 13 which also serves as an electrode plate, from the metal case 13 to the projection 14 provided on the bottom of the metal case 13. Then, the signal is transmitted to the through hole 15 of the printed circuit board 11.

As described above, since the case of the underwater wave receiver is a metal case, the entire metal case acts as an electrode plate, and the area can be made larger than that of the conventional electrode plate, and as a result, the seawater resistance is small. It is possible to

Also, connection with an electronic circuit can be easily conducted by joining a plurality of protrusions provided on the metal case to corresponding through holes of the printed substrate.

[0030]

[Effect of the device]

 As described above, according to the present invention, since the underwater receiver case is a metal case, the whole metal case acts as an electrode plate, and a plurality of protrusions are formed on the bottom of the metal case to increase the electrode area. As a result, seawater resistance can be reduced in the sea.

Further, by forming the protrusions, the protrusions can be easily joined to the through holes of the printed board and the printed board can be fixed and connected at the same time.

Further, since it can be directly molded on the metal case, a mold is not required, and the assembling work can be easily performed and the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a top view of the underwater wave receiver of the present invention.

FIG. 2 is a side view of the underwater receiver of the present invention.

FIG. 3 is a block diagram showing a signal transmission system between an underwater receiver and a signal receiving device of the present invention.

FIG. 4 is a block diagram showing a conventional signal transmission system between an underwater receiver and a signal receiving device.

FIG. 5 is a top view of a conventional underwater wave receiver.

FIG. 6 is a side view of a conventional underwater wave receiver.

[Explanation of symbols]

 1 Underwater wave receiver 2 Transmission cable 3 Electrode plate 4 Signal receiving device 11 Printed circuit board 12 Water resistant member 13 Metal case 14 Protrusion 15 Through hole

Claims (1)

[Scope of utility model registration request] 1. A vibrating plate to which piezoelectric electrons are surface-bonded, a supporting case supporting the vibrating plate and forming a closed air chamber, and a printed circuit board on which an electronic circuit is mounted and which fixes the supporting case are integrally formed. In the undersea wave receiver, a) a metal case having an open upper surface, b) a plurality of protrusions formed on the bottom of the metal case, and c) a through hole formed on the printed circuit board corresponding to the protrusion. , D) for undersea use, which comprises means for joining the through hole and the projection by welding, and e) a molding agent filled in the case from the open surface of the metal case and molding piezoelectric, printed circuit board or the like. Receiver.