JPH0521594U - Underwater receiver - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an underwater receiver that withstands environmental changes and is durable for long-term use. An electroacoustic conversion element 1 and a waterproof cable 4 for extracting an electric signal of the electroacoustic conversion element 1 are provided.
In the underwater wave receiver in which the electroacoustic conversion element 1 and a part of the waterproof cable 4 are covered with a waterproof rubber 3, the underwater wave receiver is formed by connecting the positive and negative electrodes 2a, 2b of the conversion element 1 to the end surface of the conductor. Was removed to increase the distance between the electrodes, and the entire conversion element was subjected to moisture-proof treatment, and then the conversion element 1 and a part of the waterproof cable 4 were integrally covered with the waterproof rubber 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of an underwater receiver used in an acoustic measurement device in the ocean.

[0002]

[Prior Art]

 FIG. 4 is a sectional view of a conventional underwater wave receiver. In the figure, 1 is an electroacoustic transducer (hereinafter referred to as a transducer element), 2a and 2b are electrodes, 3 is a waterproof rubber, 4 is a waterproof cable, and 5 is a lead. It is a line. In the figure, the conversion element 1 is formed by forming a positive electrode 2a and a negative electrode 2b on both sides of a film-shaped piezoelectric material such as piezoelectric rubber in which particles of a piezoelectric ceramic are mixed with piezoelectric polymer or rubber. The waterproof rubber 3 is formed by molding a rubber having a hardness of 50 to 70 degrees on the conversion element 1 for waterproofing, and the waterproof cable 4 is for extracting an electric signal generated between the positive and negative electrodes 2 a and 2 b of the conversion element 1. belongs to

The operating principle of the wave receiver is that when a sound pressure is applied to the wave receiver, the sound pressure propagates through the waterproof rubber 3 and is applied to the conversion element 1, and a distortion proportional to the sound pressure is generated in the piezoelectric material. Then, the piezoelectric effect generates an electric charge in proportion to the strain in the film-shaped piezoelectric material, so that the potential difference between the electrodes is detected through the waterproof cable 4 to obtain the sound pressure.

[0004]

[Problems to be solved by the device]

 By the way, the conventional underwater wave receiver described above can withstand normal use in water, but in a special environment such as continuous use in water or use in a place where temperature changes drastically, Such problems occur. That is, when the underwater wave receiver is subjected to changes in water pressure or temperature, the linear expansion coefficient of the conversion element 1 and the waterproof rubber 3 are different, so that the adhesive interface between the two may be distorted and the two may be separated from each other. .. In addition, depending on the type of waterproof rubber covering the conversion element, hydrolysis may occur, or moisture permeability may cause a decrease in adhesive strength or insulation.

The present invention has been made in order to solve the above problems of the conventional device, and an object of the present invention is to provide an underwater wave receiver that withstands environmental changes and has durability for long-term use. ..

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the wave receiver according to the present invention is provided with a moisture-proof treatment on the surface of the conversion element by removing the end faces of the conductors of the positive and negative electrode surfaces of the conversion element to increase the distance between the electrodes. After that, the conversion element and a part of the waterproof cable are integrally covered with waterproof rubber.

[0007]

[Action]

 Since the underwater wave receiver is configured as described above, the performance will not deteriorate even if it is used for a long time in water where the environment changes drastically.

[0008]

【Example】

 FIG. 2 is a sectional view of a wave receiver showing an embodiment of the present invention, and FIG. 1 is an enlarged sectional view thereof. In the figure, 1 to 5 are the same or equivalent parts as the conventional device, 10 is a base material, 11 is a moisture-proof coating. Is.

In the figure, the conversion element 1 is a film-shaped piezoelectric electron made of piezoelectric rubber or the like in which particles of piezoelectric ceramics are mixed with piezoelectric polymer or rubber, and both surfaces of the conversion element 1 have positive and negative conductivity. The electrodes are formed, and the electric signal generated between both electrodes is taken out to the outside via the lead wire 5 and the waterproof cable 4, as in the prior art example.

In the underwater wave receiver according to the present invention, as shown in FIG. 1, the end surfaces of the positive and negative electrodes 2a and 2b of the conversion element 1 are circumferentially removed to expose the base material 6 having an insulating property. The distance between the positive electrode 2a and the negative electrode 2b is increased. A moisture-proof coating is formed on the entire surface of the conversion element 1 to prevent water from entering from the outside. Then, after connecting the electrodes 2a, 2b of the conversion element 1 to the waterproof cable 4 via the lead wire 5, the entire conversion element 1 is covered with the waterproof rubber 3 to protect the conversion element 1 from external impact and keep moisture resistance. In addition, it prevents the deterioration of its electrical insulation. As shown in FIG. 3, even if only one end face of both the positive and negative electrodes is removed, if the surface extension distance can be sufficiently secured, the effect on performance will not be noticeable.

As described above, the extension surface distance between the positive and negative electrodes of the conversion element is expanded, the adhesion between the electrode material and the film-shaped piezoelectric material is made good by the moisture-proof coating, and the change is made by the waterproof rubber. By covering the entire conversion element 1, a double or triple waterproof structure is provided, which completely prevents moisture permeation from the outside and also prevents insulation deterioration of the conversion element.

[0012]

[Effect of the device]

 The present invention, in an underwater wave receiver, expands the distance between the positive and negative electrodes of the conversion element, and uses a moisture-proof coating to improve the adhesion between the electrode material and the film-shaped piezoelectric material, and further to make it waterproof. Since the entire conversion element 1 was covered with rubber, the following excellent effects were obtained. (1) The underwater receiver completely prevents moisture permeation from the outside by the above-mentioned configuration and also prevents deterioration of the electrical insulation of the conversion element. (2) As a result, it has withstood long-term use in water and can be used stably even in places with severe temperature changes.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an underwater wave receiver according to an embodiment of the present invention.

FIG. 2 is a sectional view of an underwater wave receiver according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of an essential part of an underwater wave receiver according to another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional underwater wave receiver.

[Explanation of symbols]

 1 ... Electroacoustic element 2a ... Electrode 2b ... Electrode 3 ... Waterproof rubber 4 ... Waterproof cable 10 ... Base material 11 ... Moisture-proof coating

Claims (1)

[Scope of utility model registration request] 1. An electroacoustic conversion element comprising a piezoelectric material as an acoustic sensor, and a waterproof cable for extracting an electric signal generated between positive and negative electrodes of the electroacoustic conversion element, and the entire surface of the electroacoustic conversion element. In an underwater wave receiver in which a part of the waterproof cable is covered with waterproof rubber, the underwater wave receiver is configured to have a large extension surface distance between electrodes by removing end faces of conductors of positive and negative electrode surfaces of the conversion element. An underwater wave receiver, characterized in that after the entire conversion element is subjected to moisture-proof treatment, the entire conversion element and a part of the waterproof cable are integrally covered with waterproof rubber.