JPS62188600A - Piezorubber sheet with electrode - Google Patents

Abstract

PURPOSE:To improve the sensitivity and the durability by disposing a conductive rubber layer including silver on both surfaces of a piezorubber sheet, laminating a carbon conductive rubber electrode on the respective silver conductive rubber layers on both the surfaces to have five layers and vulcanizing the five layer lamination to integrate them. CONSTITUTION:Crude rubber is melted on both the surfaces of an unvulcanized plate shape piezorubber 1 with a solvent such as toluene to liquefy it, further the silver conductive rubber 2, 2 obtained by sequentially adding a vulcanizing agent and completely stirring are coated to evaporate the solvent. Then, the carbon conductive electrodes 3, 3 (unvulcanized) are adhered to the silver conductive rubbers 2, 2 on both the surfaces of laminate the five layers and the lamination of the five layers is pressed and vulcanized by a press vulcanizer to integrate them. Thereby, the integrated form without a separation is obtained and the silver excellent in the conductivity is contained, so that, the electric performance, especially, a hydrophone constant such as dh, gh is improved.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、水中送受波素子として利用される電極付ピエ
ゾゴムシートに係り、待にａｈ、　Ｈｂ等のハイドロ７
オン定数を改善したものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a piezo rubber sheet with electrodes used as an underwater wave transmitting/receiving element.
This is an improved on-state constant.

（従来の技術） 第３図に示すように、ピエゾゴムａの両面にカーボン導
電ゴム電極すを重ねて三層とし、その三層の積層体を加
硫により一体化した電極付ピエゾゴムは公知である。し
かるにこの従来技術になる電極付ピエゾゴムシートを水
Φ送受波素子として用いた場合、Ｊｈ、　Ｆｌｈ等のハ
イドロ７オン定数が低い欠点をもつ。その他、第４図に
示すピエゾゴムａの両面に銀塗料を塗布して電極Ｃを形
成した電極付ピエゾゴムシートも知られているが、電極
Ｃの強度が低くて剥がれ易く、耐久性が低ν・欠点があ
る。(Prior art) As shown in Fig. 3, a piezo rubber with electrodes is known in which carbon conductive rubber electrodes are stacked on both sides of piezo rubber a to form three layers, and the three-layer laminate is integrated by vulcanization. . However, when this prior art piezo rubber sheet with electrodes is used as a water Φ transceiver element, it has the disadvantage of low hydro7 on constants such as Jh and Flh. In addition, a piezo rubber sheet with electrodes is known in which electrodes C are formed by coating both sides of piezo rubber a shown in FIG.・There are drawbacks.

（発明が解決しようとする問題点） １１　図ノミ極付ピエゾゴムシートは電極の体積固有抵
抗が１〜１０ΩＱｍと大きく、このためピエゾゴムの感
度性能を見掛上不良にしている。またｆ５４図の電雨付
ピエゾゴムシートは電極の体積固有抵抗が００ＯＯ１Ω
ｃａｎ以下であって、感度性能は良好であるが、前記の
ように耐久性が至って低い。(Problems to be Solved by the Invention) 11 The piezo rubber sheet with chisel electrodes has a large volume resistivity of 1 to 10 ΩQm, which makes the sensitivity performance of the piezo rubber apparently poor. In addition, the volume resistivity of the electrode of the piezo rubber sheet with electric rain shown in figure f54 is 00OO1Ω.
CAN or less, and the sensitivity performance is good, but the durability is extremely low as described above.

本発明は第３．４図の従来の電極付ピエゾゴムのもつ欠
点を改良し、感度及１／酎久性を共に向上することを解
決すべき問題点とするものである。The present invention aims to improve the drawbacks of the conventional piezo rubber with electrodes shown in FIG. 3.4, and to improve both sensitivity and 1/durability.

（問題点を解決するための手段） 本発明は、前項に述べた問題点を解決することを目的と
して研究を重ねたものであって、ピエゾゴムシートの両
面に銀を含有する導電ゴム層を設け、該両面の銀導電ゴ
ム層の各々にカーボン導電ゴム電極を重ねて五層とし、
その五層の積層体を加硫により一体にしたことによって
前記目的を達した。(Means for Solving the Problems) The present invention is the result of repeated research aimed at solving the problems described in the previous section, and includes a conductive rubber layer containing silver on both sides of a piezo rubber sheet. and carbon conductive rubber electrodes are stacked on each of the silver conductive rubber layers on both sides to form five layers,
The above object was achieved by integrating the five-layer laminate by vulcanization.

（作用） 本発明は前記したｖｔｒ＆になり、通常は三層であるた
めぬ前記した種々の欠点をもつのを五層とし、第二層と
第四層の導電ゴム層と、中心層のピエゾゴムシート及び
第一層と第五層のカーボン導電ゴム電極とを加硫して剥
離することがない一体形にできると同時に、第二層と第
四層に導電性において優れた銀を含有させ、それによっ
て電気的性能を優良にしているものでる。(Function) The present invention provides the above-mentioned VTR&, and instead of the usual three layers, which have the various drawbacks mentioned above, the present invention has five layers, the second and fourth conductive rubber layers, and the piezoelectric center layer. The rubber sheet and the carbon conductive rubber electrodes of the first and fifth layers can be vulcanized to form an integral structure that will not peel off, and at the same time, the second and fourth layers contain silver, which has excellent conductivity. , which provides excellent electrical performance.

（実施例） 第１．２図は本発明の好適な一実施例を示すもので、未
加硫板形のピエゾゴム１の両面に、生ゴムをトルエン等
の溶剤で溶がして液状化し、さらに銀粉末、加硫剤を順
次に加えてよく攪拌した銀導電ゴム２．２を塗着して溶
剤を揮発させ、さらにその両面の銀導電ゴム２．２にカ
ーボン導電ゴム電極（未加硫）３．３を貼り合わせ五層
に積層し、この五層の積層体をプレス加硫装置によって
加圧加硫して一体状にする。(Example) Figure 1.2 shows a preferred embodiment of the present invention, in which raw rubber is liquefied by dissolving it in a solvent such as toluene on both sides of an unvulcanized plate-shaped piezo rubber 1, and then Silver conductive rubber 2.2 is coated with silver powder and vulcanizing agent mixed well and the solvent is evaporated, and carbon conductive rubber electrodes (unvulcanized) are applied to the silver conductive rubber 2.2 on both sides. 3.3 are laminated to form five layers, and the five-layer laminate is pressure-vulcanized using a press vulcanizer to form an integral body.

前記の銀導電ゴム２．２に加える加硫剤は、ピエゾゴム
１及びカーボン導電ゴム電極３．３と同一であれば、前
記五層の各層の接着強度を大きくすることができるが、
加硫剤に異なるものを使用しても構わない。If the vulcanizing agent added to the silver conductive rubber 2.2 is the same as that of the piezo rubber 1 and the carbon conductive rubber electrode 3.3, it is possible to increase the adhesive strength of each of the five layers.
Different vulcanizing agents may be used.

前記の銀導電ゴム２．２の溶剤を乾燥したときの厚さは
２０〜４０μ、体積固有抵抗は０．００１Ωｃｍであっ
た。The thickness of the silver conductive rubber 2.2 when dried from the solvent was 20 to 40 μm, and the volume resistivity was 0.001 Ωcm.

（本発明の効果） 従来の第１図の電極付ピエゾゴムシートと本発明の電極
付ピエゾゴムシートの電気的性能の比較試験を施し、次
表の成績を得た。表中（１）は第１図の従来の三層から
なる電極付加硫ピエゾゴムシー）、（２）は本発明の五
層からなる電極付加硫ピエゾゴムシートで、（１）、（
２）の加硫その他の製造条件を同じにした。分極条件は
共に１００ＫＶ／ｃ＋ｎ・ｌｈｒて・ある。(Effects of the Present Invention) A comparative test was conducted on the electrical performance of the conventional piezo rubber sheet with electrodes shown in FIG. 1 and the piezo rubber sheet with electrodes of the present invention, and the results shown in the following table were obtained. In the table, (1) is the conventional three-layer electrode-added sulfur piezo rubber sheet shown in Figure 1), (2) is the five-layer electrode-added sulfur piezo rubber sheet of the present invention;
The vulcanization and other manufacturing conditions of 2) were the same. The polarization conditions were both 100 KV/c+n·lhr.

電気的性能比較試験表 本発明はこの比較試験表によっても明らがなようにｄｈ
％ｇｂ等のハイドロ７オン定数を者しく改良し、感度を
良好にすると共に、耐久性を第３図の従来の三Ｎ構成の
ものと均等に出来る効果を得た。Electrical Performance Comparison Test Table As is clear from this comparison test table, the present invention
Hydro7 on constants such as %gb have been significantly improved, sensitivity has been improved, and durability has been made equal to that of the conventional 3N configuration shown in FIG. 3.

【図面の簡単な説明】[Brief explanation of drawings]

第１．２図は本発明の一実施例を示し、第１図は五層構
成を示した分離側面図、第２図は加硫による一体構成の
縦断面図である。第３図及び第４図は従来の電極付ピエ
ゾゴムシートの各斜視図である。Fig. 1.2 shows an embodiment of the present invention, Fig. 1 is an isolated side view showing a five-layer structure, and Fig. 2 is a vertical sectional view of an integrated structure formed by vulcanization. 3 and 4 are perspective views of conventional piezo rubber sheets with electrodes.

Claims (1)

【特許請求の範囲】[Claims] 　ピエゾゴムシートの両面に銀を含有する導電ゴム層を
設け、該両面の銀導電ゴム層の各々にカーボン導電ゴム
電極を重ねて五層とし、その五層の積層体を加硫により
一体にしたことを特徴とする電極ピエゾゴムシート。Conductive rubber layers containing silver were provided on both sides of a piezo rubber sheet, carbon conductive rubber electrodes were stacked on each of the silver conductive rubber layers on both sides to form five layers, and the laminate of the five layers was integrated by vulcanization. An electrode piezo rubber sheet characterized by: