JPH0412633B2 - - Google Patents
Info
- Publication number
- JPH0412633B2 JPH0412633B2 JP59023400A JP2340084A JPH0412633B2 JP H0412633 B2 JPH0412633 B2 JP H0412633B2 JP 59023400 A JP59023400 A JP 59023400A JP 2340084 A JP2340084 A JP 2340084A JP H0412633 B2 JPH0412633 B2 JP H0412633B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- layer
- outer layer
- inner layer
- negative electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 230000006355 external stress Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/60—Piezoelectric or electrostrictive devices having a coaxial cable structure
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
本発明は、海底地震探査や魚群探知用のハイド
ロフオンとして、また超音波洗浄装置の洗浄液内
における音響測定子として好適に利用される水中
用同軸型圧電ケーブルに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underwater coaxial piezoelectric cable that is suitably used as a hydrophon for seabed seismic exploration and fish detection, and as an acoustic probe in the cleaning liquid of an ultrasonic cleaning device.
ポリ弗化ビニリデン、ポリ弗化ビニール、ポリ
塩化ビニリデン、ポリ塩化ビニール、ナイロン等
の圧電性有機物もしくは合成ゴムや合成樹脂の有
機物中にチタン酸ジルコニア酸鉛、チタン酸鉛等
の強誘電セラミツク粒子を混合してなる圧電性有
機セラミツク複合物等の有機系圧電材料は、一般
の焼結質圧電磁器材料に比し、その音響インピー
ダンスが水の音響インピーダンスに近似する特性
を有し、このため、これを圧電トランデユーサと
して用いると水中を伝播する音響波を効率良く受
波し、感度を高め得る利点を生じる。 Ferroelectric ceramic particles such as lead zirconia titanate and lead titanate are incorporated into piezoelectric organic materials such as polyvinylidene fluoride, polyvinyl fluoride, polyvinylidene chloride, polyvinyl chloride, and nylon, or organic materials such as synthetic rubber and synthetic resin. Organic piezoelectric materials, such as piezoelectric organic ceramic composites, have a characteristic that their acoustic impedance approximates the acoustic impedance of water, compared to general sintered piezoelectric ceramic materials. When used as a piezoelectric transducer, it has the advantage of efficiently receiving acoustic waves propagating in water and increasing sensitivity.
そこで第１図に示すように、前記有機系圧電層
ａを中心導線ｂの周りに配置し、かつ該圧電材料
の外周に導電塗料等の導電材ｃを配置して同軸状
の圧電ケーブルを形成し、これを水中に浸漬し
て、前記中心導線ｂ及び導電材ｃ間から出力信号
を取出して前記水中を伝播する音響波を受信する
ようにした同軸型圧電ケーブルがある。 Therefore, as shown in FIG. 1, a coaxial piezoelectric cable is formed by arranging the organic piezoelectric layer a around the center conducting wire b, and arranging a conductive material c such as conductive paint around the outer periphery of the piezoelectric material. However, there is a coaxial type piezoelectric cable which is immersed in water and receives an acoustic wave propagating in the water by extracting an output signal from between the center conducting wire b and the conductive material c.
ところで、前記構成による圧電ケーブルは、柔
軟であるため、音響波以外の圧力、例えば水の流
動、波立その他の外力応力により屈撓し、このた
め前記圧電層ａに曲げ応力が作用して電荷を生
じ、これがノイズ信号となつて音響波に重畳的に
加わり、Ｓ／Ｎ比を低下させるという欠点があつ
た。 By the way, since the piezoelectric cable having the above structure is flexible, it bends due to pressure other than acoustic waves, such as flowing water, ripples, and other external forces, and therefore bending stress acts on the piezoelectric layer a, causing charge to be released. This has the disadvantage that it becomes a noise signal and is superimposed on the acoustic wave, reducing the S/N ratio.
本発明は、前記従来構成の欠点を除去すること
を目的とし、有機系圧電材料からなる内外の圧電
内層と圧電外層とを、遮音層を介して同心状に設
けるとともに、前記圧電内層の正極を圧電外層の
負極と、圧電内層の負極を圧電外層の正極と夫々
電気的に接続し、かつ圧電外層の両極から出力信
号を取出すようにしてなり、圧電ケーブルが外圧
により湾曲した場合に、前記圧電外層および圧電
内層に発生する電荷を夫々の電気的接続により打
消し合うようにし、また音響波の影響は、遮音層
により圧電内層に及ぼさないようにして前記音響
波に対応する出力を圧電外層から取出し得るよう
にしたものである。 The present invention aims to eliminate the drawbacks of the conventional structure, and includes an inner piezoelectric layer and an outer piezoelectric layer made of an organic piezoelectric material, which are provided concentrically with a sound insulating layer in between, and a positive electrode of the piezoelectric inner layer. The negative electrode of the piezoelectric outer layer and the negative electrode of the piezoelectric inner layer are respectively electrically connected to the positive electrode of the piezoelectric outer layer, and output signals are taken out from both poles of the piezoelectric outer layer. When the piezoelectric cable is bent by external pressure, the piezoelectric Electric charges generated in the outer layer and the inner piezoelectric layer are canceled out by their respective electrical connections, and the influence of acoustic waves is prevented from affecting the inner piezoelectric layer by a sound insulating layer, so that the output corresponding to the acoustic waves is transmitted from the outer piezoelectric layer. It is designed so that it can be taken out.
本発明の一実施例を添付図面について説明す
る。 An embodiment of the invention will be described with reference to the accompanying drawings.
２は圧電ゴム等からなる圧電内層であつてその
内側が正、外側が負となるように分極され、中心
電線１がその中心を通つている。該圧電内層２の
周りには導電塗料等からなる電極３が形成されて
おり、該電極３の外周に引出し用の電極線４が巻
回している。さらにその外側には、発泡材料や、
布、紙等からなる遮音層５が設けられている。ま
た該遮音層５の周りには導電ゴム６が設けられ、
その周囲に引出し用の電極線７が巻回している。 Reference numeral 2 denotes a piezoelectric inner layer made of piezoelectric rubber or the like, which is polarized so that the inner side is positive and the outer side is negative, and the center wire 1 passes through its center. An electrode 3 made of conductive paint or the like is formed around the piezoelectric inner layer 2, and an electrode wire 4 for extraction is wound around the outer periphery of the electrode 3. Furthermore, on the outside, there is foam material,
A sound insulating layer 5 made of cloth, paper, etc. is provided. Further, a conductive rubber 6 is provided around the sound insulation layer 5,
A lead-out electrode wire 7 is wound around it.
８は、内側を正、外側を負に分極した、圧電ゴ
ム等からなる圧電外層であつて、該圧電外層８の
周面には導電塗料を塗着して形成した電極９が設
けられ、さらに導電性の網組１０がその外周に被
着されている。 Reference numeral 8 denotes a piezoelectric outer layer made of piezoelectric rubber or the like, with the inner side polarized positively and the outer side negatively polarized, and an electrode 9 formed by applying a conductive paint is provided on the circumferential surface of the piezoelectric outer layer 8. A conductive mesh 10 is applied around its outer periphery.
而て形成された同軸型圧電ケーブルは、圧電内
層２の正電極側と接続した中心電線１と、圧電外
層８の負電極と接続した網組１０とをリード線１
１により電気的に接続して、その端部を出力端子
１２とし、さらに圧電内層２の負電極と接続した
電極線４と、圧電外層８の正電極側と接続した電
極線４とをリード線１３により接続して、その端
部を出力端子１４とし、前記出力端子１２，１４
間より出力信号を取出すようにしている。尚前記
出力端子１２は、アース側となつている。 The coaxial piezoelectric cable thus formed has a lead wire 1 that connects the center wire 1 connected to the positive electrode side of the piezoelectric inner layer 2 and the braid 10 connected to the negative electrode of the piezoelectric outer layer 8.
1, the end thereof is used as an output terminal 12, and the electrode wire 4 connected to the negative electrode of the piezoelectric inner layer 2 and the electrode wire 4 connected to the positive electrode side of the piezoelectric outer layer 8 are connected as lead wires. 13, the end thereof is used as an output terminal 14, and the output terminals 12, 14
The output signal is extracted from between the two. Note that the output terminal 12 is on the ground side.
前記実施例の作用を説明すると、前記圧電ケー
ブルが波立等により湾曲すると、前記圧電内層
２、圧電外層８に曲げ応力が加わつて、夫々に電
荷が生じる。ところで、前記屈曲によつて圧電内
層２、圧電外層８に発生する電荷量はほとんど同
じであり、前記したように圧電内層２の正電極
と、圧電外層８の負電極とはリード線１１により
電気的に接続され、また圧電内層２の負電極と圧
電外層８の正電極とはリード線１３により電気的
に接続しているので、夫々打消し合い、結局出力
端子１２，１４間には前記波立等の外的応力によ
つては電位差が生じない。一方、音響波にする影
響はケーブル全外周から圧電外層８に作用する
が、前記遮音層５によつて緩衝されて圧電内層２
へは作用しない。このため前記圧電外層８にのみ
音響波による電荷が発生し、結局、前記したよう
に波立等の外的応力による電位の発生は消去され
てあるから端子１２，１４間には音響波に対応す
る電気信号のみが抽出される。このため、前記湾
曲による影響を受けないで、音響波のみを受信す
ることができるようになる。 To explain the operation of the embodiment, when the piezoelectric cable is bent due to undulation or the like, bending stress is applied to the piezoelectric inner layer 2 and the piezoelectric outer layer 8, and charges are generated in each of them. By the way, the amount of charge generated in the piezoelectric inner layer 2 and the piezoelectric outer layer 8 due to the bending is almost the same, and as described above, the positive electrode of the piezoelectric inner layer 2 and the negative electrode of the piezoelectric outer layer 8 are connected to each other by the lead wire 11. Furthermore, since the negative electrode of the piezoelectric inner layer 2 and the positive electrode of the piezoelectric outer layer 8 are electrically connected by the lead wire 13, they cancel each other out, and the ripples appear between the output terminals 12 and 14. No potential difference occurs due to external stress such as. On the other hand, the effect of making an acoustic wave acts on the piezoelectric outer layer 8 from the entire outer circumference of the cable, but it is buffered by the sound insulating layer 5 and the piezoelectric inner layer 8 is
It has no effect on . Therefore, a charge is generated only in the piezoelectric outer layer 8 due to the acoustic wave, and as a result, as described above, the generation of potential due to external stress such as ripples is eliminated, so that the electric charge between the terminals 12 and 14 corresponds to the acoustic wave. Only electrical signals are extracted. Therefore, only acoustic waves can be received without being affected by the curvature.
前記実施例において、圧電内層２、圧電外層８
の分極方向は任意に選ぶことができるが、この場
合にも圧電内層２の正電極を圧電外層８の負電極
と、圧電内層２の負電極を圧電外層８の正電極と
夫々電気的に接続する必要がある。 In the embodiment, the piezoelectric inner layer 2 and the piezoelectric outer layer 8
The polarization direction can be arbitrarily selected, but in this case as well, the positive electrode of the piezoelectric inner layer 2 is electrically connected to the negative electrode of the piezoelectric outer layer 8, and the negative electrode of the piezoelectric inner layer 2 is electrically connected to the positive electrode of the piezoelectric outer layer 8. There is a need to.
また、圧電内層２と圧電外層８との間に介在さ
せた遮音層５を多層としてその厚みを厚くするこ
とによつて遮音効果を向上することができる。 Moreover, the sound insulation effect can be improved by making the sound insulation layer 5 interposed between the piezoelectric inner layer 2 and the piezoelectric outer layer 8 multilayer and increasing its thickness.
本発明は前記の説明によつて明らかにしたよう
に遮音層５を介して同心状に設けられた圧電内層
２と圧電外層８とを、圧電内層２の正極を圧電外
層８の負極と、圧電内層２の負極を圧電外層８の
正極と接続するようにして配線し、かつ圧電外層
８の両極から出力信号を取出すようにして圧電ケ
ーブルが外圧により湾曲した場合に、前記圧電内
層２および圧電外層８に発生する電荷を夫々の電
気的接続により打消し合うようにしたから、圧電
外層８にのみ発生する音響波に対応する出力を、
前記波立等の外的応力による影響を可及的に除去
して抽出でき、該出力のＳ／Ｎ比を著しく向上で
きる等の優れた効果がある。 As clarified from the above description, the present invention connects the piezoelectric inner layer 2 and the piezoelectric outer layer 8 that are concentrically provided with the sound insulating layer 5 interposed between the positive electrode of the piezoelectric inner layer 2, the negative electrode of the piezoelectric outer layer 8, and the piezoelectric Wiring is done so that the negative electrode of the inner layer 2 is connected to the positive electrode of the piezoelectric outer layer 8, and output signals are taken out from both poles of the piezoelectric outer layer 8. When the piezoelectric cable is bent by external pressure, the piezoelectric inner layer 2 and the piezoelectric outer layer Since the electric charges generated in the piezoelectric outer layer 8 are canceled by each electrical connection, the output corresponding to the acoustic wave generated only in the piezoelectric outer layer 8 is
This has excellent effects such as being able to remove and extract the influence of external stress such as the ripples as much as possible, and significantly improving the S/N ratio of the output.
第１図は、従来装置の斜視図、第２，３図は本
発明の一実施例を示し第２図は斜視図、第３図は
縦断面図である。
１；中心電線、２；圧電内層、５；遮音層、
８；圧電外層、１２，１４；出力端子。
Fig. 1 is a perspective view of a conventional device, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is a perspective view, and Fig. 3 is a longitudinal sectional view. 1; central electric wire, 2; piezoelectric inner layer, 5; sound insulation layer,
8; piezoelectric outer layer, 12, 14; output terminal.
Claims (1)
電外層とを、遮音層を介して同心状に設けるとと
もに、前記圧電内層の正極を圧電外層の負極と、
圧電内層の負極を圧電外層の正極と夫々電気的に
接続し、かつ圧電外層の両極から出力信号を取出
すようにしたことを特徴とする水中用同軸型圧電
ケーブル。1. An inner and outer piezoelectric layer and an outer piezoelectric layer made of an organic piezoelectric material are provided concentrically with a sound insulating layer interposed therebetween, and the positive electrode of the piezoelectric inner layer is connected to the negative electrode of the piezoelectric outer layer,
An underwater coaxial piezoelectric cable characterized in that the negative electrode of the piezoelectric inner layer is electrically connected to the positive electrode of the piezoelectric outer layer, and output signals are taken out from both poles of the piezoelectric outer layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59023400A JPS60180181A (en) | 1984-02-09 | 1984-02-09 | Underwater use coaxial type piezoelectric cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59023400A JPS60180181A (en) | 1984-02-09 | 1984-02-09 | Underwater use coaxial type piezoelectric cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60180181A JPS60180181A (en) | 1985-09-13 |
| JPH0412633B2 true JPH0412633B2 (en) | 1992-03-05 |
Family
ID=12109454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59023400A Granted JPS60180181A (en) | 1984-02-09 | 1984-02-09 | Underwater use coaxial type piezoelectric cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60180181A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2617659B1 (en) * | 1987-06-30 | 1990-09-14 | Inst Francais Du Petrole | PIEZOELECTRIC TRANSDUCER HAVING SEVERAL COAXIAL SENSITIVE ELEMENTS |
-
1984
- 1984-02-09 JP JP59023400A patent/JPS60180181A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60180181A (en) | 1985-09-13 |
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