JPS62231593A - Piezoelectric wave transmitter-receiver - Google Patents
Piezoelectric wave transmitter-receiverInfo
- Publication number
- JPS62231593A JPS62231593A JP7519686A JP7519686A JPS62231593A JP S62231593 A JPS62231593 A JP S62231593A JP 7519686 A JP7519686 A JP 7519686A JP 7519686 A JP7519686 A JP 7519686A JP S62231593 A JPS62231593 A JP S62231593A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- center
- plate
- electrodes
- holding plate
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 abstract description 8
- 239000005060 rubber Substances 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 238000009499 grossing Methods 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 239000011368 organic material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect 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
- 239000000843 powder Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、圧電可撓性シートよりなる圧電板を備えた、
水中用送波器、水中マイクロフォン等に使用される圧電
送受波器に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a piezoelectric plate comprising a piezoelectric flexible sheet.
This invention relates to piezoelectric transducers used in underwater transmitters, underwater microphones, etc.
〈従来技術〉
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
コン酸鉛、チタン酸鉛等の強誘電セラミック粒子を混合
してなる圧電性有機セラミック複合物等の圧電可撓性シ
ートは、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する。そこで、該圧電可撓性シート
は水中を伝播する音響波を送受波するのに用いられる。<Prior art> Piezoelectric organic materials such as polyvinylidene fluoride, polyvinyl fluoride, polyvinylidene chloride, polyvinyl chloride, and nylon, or strong organic materials such as lead zirconate titanate and lead titanate in the organic materials of synthetic rubber and synthetic resin. A piezoelectric flexible sheet such as a piezoelectric organic ceramic composite made of a mixture of dielectric ceramic particles has an acoustic impedance close to that of water. Therefore, the piezoelectric flexible sheet is used to transmit and receive acoustic waves propagating in water.
また、圧電磁器板にあっても、水中用圧電送受波塁とし
て用いられるものがある。Furthermore, some piezoelectric ceramic plates are used as underwater piezoelectric transmitting and receiving bases.
その他、この種の圧電板を用いた圧電送受波器は、空中
での音波の送受波のためにも適用され得る。In addition, a piezoelectric transducer using this type of piezoelectric plate can also be applied to transmit and receive sound waves in the air.
この種の圧電送受波器は、圧電板の上下電極間に交番電
圧を印加することにより送波器として使用され、該圧電
板で音波を受けとめて該電極間から信号電圧を発生する
ことにより受波器として使用される。This type of piezoelectric transducer is used as a wave transmitter by applying an alternating voltage between the upper and lower electrodes of a piezoelectric plate, and receives sound waves by receiving them on the piezoelectric plate and generating a signal voltage between the electrodes. Used as a wave device.
〈発明が解決しようとする問題点〉
ところで、公知構成の圧電送受波器に適用される圧電板
は面方向に渡って均一な肉厚を有するものであって、中
央部に位置する最大振巾を生ずる主極以外に、その周辺
方向に複数の副極（サイドローブ）が生じている。<Problems to be Solved by the Invention> By the way, the piezoelectric plate applied to the piezoelectric transducer with a known configuration has a uniform wall thickness in the plane direction, and the maximum amplitude located in the center part In addition to the main pole that produces , a plurality of sub-poles (side lobes) occur in the peripheral direction.
このため、圧電板を送波器として用いた場合には、上下
電極に交番電圧を印加すると、主極を軸とする最大振巾
の発生とともに、複数の副極を軸とする副振動が同時に
多発し、第４図に示すように、その送波方向が拡散され
、不要な方向に送波したり、音の位相が乱れたりし、指
向性が低下する不都合を生じる。また圧電板を受波器と
して用いた場合には、検出すべき音波以外の多様な方向
からの波動を、前記副極で拾って、ノイズを発生し、Ｓ
／Ｎ比を低下させることとなる。Therefore, when a piezoelectric plate is used as a wave transmitter, when an alternating voltage is applied to the upper and lower electrodes, the maximum amplitude occurs around the main pole, and secondary vibrations around multiple secondary poles simultaneously occur. As shown in FIG. 4, this occurs frequently, and as shown in FIG. 4, the wave transmission direction is diffused, resulting in the wave being transmitted in an unnecessary direction, the phase of the sound being disturbed, and the directivity being deteriorated. In addition, when a piezoelectric plate is used as a wave receiver, the sub-pole picks up waves from various directions other than the sound waves to be detected, generating noise and causing S
/N ratio will be lowered.
本発明は、前記副極での送受波を可及的に減殺し得る圧
電板を備えた圧電送受波器の提供を目的とするものであ
る。An object of the present invention is to provide a piezoelectric transducer equipped with a piezoelectric plate that can reduce transmission and reception of waves at the sub-pole as much as possible.
く問題点を解決するための手段〉
本発明は、圧電可撓性シートの両面に電極を形成してな
る圧電板を備えたものにおいて、圧電可撓性シートを、
その中央部にテンションが作用するように、保持板で形
状維持したことを特徴とするものである。Means for Solving the Problems> The present invention provides a piezoelectric plate having electrodes formed on both sides of a piezoelectric flexible sheet.
The feature is that the shape is maintained by a retainer plate so that tension is applied to the central part.
く作用〉
圧電可撓性シートを延伸させてテンションを加えると、
送受波感度が向上することが知られている。Effect〉 When the piezoelectric flexible sheet is stretched and tension is applied,
It is known that the transmitting and receiving sensitivity is improved.
そこで、その中央部のみにテンションが加わるように、
その形状を保持したから、該中央部で圧電作用及び電歪
作用が高まる。Therefore, in order to apply tension only to the central part,
Since the shape is maintained, the piezoelectric effect and electrostrictive effect are enhanced in the central portion.
従って、送波器として用いた場合には、主極での主振動
に比して、副極での副振動は相対的に低下することとな
る。Therefore, when used as a wave transmitter, the sub-vibration at the sub-pole is relatively reduced compared to the main vibration at the main pole.
また受波器として用いた場合には、中央部分は周辺に比
して高感度となり、主極から発生する信号電圧は大きく
なる。このため、制御回路での信号電圧の閾値を高くす
ることができ、副極で拾われた信号はキャンセルされる
。Furthermore, when used as a wave receiver, the central part has higher sensitivity than the surrounding area, and the signal voltage generated from the main pole becomes larger. Therefore, the threshold value of the signal voltage in the control circuit can be increased, and the signal picked up by the sub-pole is canceled.
〈実施例〉 添付図面について本発明の一実施例を説明する。<Example> An embodiment of the invention will now be described with reference to the accompanying drawings.
ｌは圧電可撓性シートの一例である円板状圧電ゴムシー
トであって、合成ゴムに、チタン酸鉛。1 is a disc-shaped piezoelectric rubber sheet which is an example of a piezoelectric flexible sheet, and is made of synthetic rubber and lead titanate.
チタン酸バリウム、チタン酸ジルコン酸鉛等の圧電セラ
ミック粉末を分散させてなるものである。It is made by dispersing piezoelectric ceramic powders such as barium titanate and lead zirconate titanate.
前記圧電ゴムシート１は、その両面に電極２．３を形成
され、電極２，３に直流電圧を印加して厚み方向に分極
される。The piezoelectric rubber sheet 1 has electrodes 2 and 3 formed on both sides thereof, and is polarized in the thickness direction by applying a DC voltage to the electrodes 2 and 3.
前記圧電ゴムシート１は、第１図イのようにアルミニュ
ーム、ステンレス等の金属板のような可塑性全屈材料か
らなる湾曲保持板１０に貼着される。前記湾曲保持板１
０は第２図のように中央に最大曲率部Ｘが形成されてい
る。この湾曲保持板１０を頂部より垂直方向に押圧Ｐし
て、平板状に変形させると、圧電ゴムシート１の中央は
、最大曲率部Ｘの平面化に伴って強制的に延伸され、大
きなテンションが加えられることとなる。而て、本発明
に係る圧電板（第１図口）が構成される。The piezoelectric rubber sheet 1 is attached to a curved holding plate 10 made of a plastic fully bendable material such as a metal plate such as aluminum or stainless steel, as shown in FIG. 1A. The curved retaining plate 1
0 has a maximum curvature portion X formed in the center as shown in FIG. When this curved holding plate 10 is pressed in the vertical direction from the top and deformed into a flat plate shape, the center of the piezoelectric rubber sheet 1 is forcibly stretched as the maximum curvature portion X becomes flat, and a large tension is generated. It will be added. Thus, a piezoelectric plate (see Figure 1) according to the present invention is constructed.
前記圧電板に交番電圧を印加する場合には、外面側の電
極２と前記保持板１０間に交流電源を接続する。また受
波器として用いる場合には、前記電極２と保持板１０間
から信号が取出されることとなる。When applying an alternating voltage to the piezoelectric plate, an alternating current power source is connected between the electrode 2 on the outer surface side and the holding plate 10. Further, when used as a wave receiver, a signal will be extracted from between the electrode 2 and the holding plate 10.
前記圧電板の形状は、円形の他、矩形状等もあり得る。The shape of the piezoelectric plate may be circular or rectangular.
前記した本発明に係る圧電板の指向特性を実験したとこ
ろ、第３図のようになり、副振動は一３０ｄＢ以下に抑
制され、著しく低下したことが示された。すなわち、指
向性が向上したことが確認できた。When the directional characteristics of the piezoelectric plate according to the present invention described above were tested, the result was as shown in FIG. 3, and it was shown that the secondary vibration was suppressed to -30 dB or less, which was significantly reduced. In other words, it was confirmed that the directivity was improved.
〈発明の効果ン
本発明は、上述のように、圧電送受波器に供される圧電
板の中央部を延伸して高感度とし、主権となる中心部で
圧電作用及び電歪作用を向上させ、その周辺部では相対
的に低くした。このため、送波器にあっては主極での主
振動に比して。<Effects of the Invention> As mentioned above, the present invention extends the central part of the piezoelectric plate used in the piezoelectric transducer to make it highly sensitive, and improves the piezoelectric action and electrostrictive action in the central part which is the dominant part. , and the surrounding area was relatively low. For this reason, in a transmitter, compared to the main vibration at the main pole.
副極での副振動が著しく低下して指向特性が向上する。Sub-vibration at the sub-pole is significantly reduced and directional characteristics are improved.
また受波器にあっては、主極から発生する信号電圧が、
副極で発生するものよりも、飛躍的に大きくなり、検知
すべき音波に対応する良好な信号を得ることができ、Ｓ
／Ｎ比が向上する等の優れた効果がある。In addition, in the receiver, the signal voltage generated from the main pole is
The S
There are excellent effects such as an improvement in the /N ratio.
添付図面は本発明の実施例を示し、第１図イは湾曲状態
を示す縦断側面図、第１図口はモ面状態を示す縦断側面
図、第２図は湾曲保持板１０の一部切欠斜視図、第３図
は本発明の圧電板の指向特性図、第４図は従来構成のも
のの指向特性図である。
１：圧電ゴムシー） １０；湾曲保持板剤 １（２
第２図
第 ３図
ｖｉ４図
（ｄＢ）The attached drawings show an embodiment of the present invention, in which FIG. 1A is a longitudinal sectional side view showing a curved state, FIG. 1 A is a longitudinal sectional side view showing a flat state, and FIG. A perspective view, FIG. 3 is a directional characteristic diagram of the piezoelectric plate of the present invention, and FIG. 4 is a directional characteristic diagram of a piezoelectric plate having a conventional structure. 1: Piezoelectric rubber sheet) 10; Curved retaining plate agent 1 (2 Fig. 2 Fig. 3 vi 4 (dB)
Claims (1)
を備えたものにおいて、圧電可撓性シートを、その中央
部にテンションが作用するように、保持板で形状維持し
たことを特徴とする圧電送受波器。A device comprising a piezoelectric plate formed by forming electrodes on both sides of a piezoelectric flexible sheet, characterized in that the shape of the piezoelectric flexible sheet is maintained by a retaining plate so that tension is applied to the central part of the piezoelectric flexible sheet. piezoelectric transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7519686A JPH0632549B2 (en) | 1986-03-31 | 1986-03-31 | Piezoelectric transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7519686A JPH0632549B2 (en) | 1986-03-31 | 1986-03-31 | Piezoelectric transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62231593A true JPS62231593A (en) | 1987-10-12 |
| JPH0632549B2 JPH0632549B2 (en) | 1994-04-27 |
Family
ID=13569196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7519686A Expired - Lifetime JPH0632549B2 (en) | 1986-03-31 | 1986-03-31 | Piezoelectric transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632549B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01175090U (en) * | 1988-05-28 | 1989-12-13 | ||
| JP2003505865A (en) * | 1999-07-20 | 2003-02-12 | エスアールアイ インターナショナル | Improved electroactive polymer |
| JP2003506858A (en) * | 1999-07-20 | 2003-02-18 | エスアールアイ インターナショナル | Electroactive polymer |
| JP2003526213A (en) * | 2000-02-23 | 2003-09-02 | エスアールアイ インターナショナル | Bio-powered electroactive polymer generator |
-
1986
- 1986-03-31 JP JP7519686A patent/JPH0632549B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01175090U (en) * | 1988-05-28 | 1989-12-13 | ||
| JP2003505865A (en) * | 1999-07-20 | 2003-02-12 | エスアールアイ インターナショナル | Improved electroactive polymer |
| JP2003506858A (en) * | 1999-07-20 | 2003-02-18 | エスアールアイ インターナショナル | Electroactive polymer |
| JP2014014266A (en) * | 1999-07-20 | 2014-01-23 | Sri Internatl | Transducer, actuator, and method of manufacturing transducer |
| JP2003526213A (en) * | 2000-02-23 | 2003-09-02 | エスアールアイ インターナショナル | Bio-powered electroactive polymer generator |
| JP2013102681A (en) * | 2000-02-23 | 2013-05-23 | Sri Internatl | Electroactive polymer generators powered by environment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0632549B2 (en) | 1994-04-27 |
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