JPH04127800A - Piezoelectric transducer - Google Patents
Piezoelectric transducerInfo
- Publication number
- JPH04127800A JPH04127800A JP24968690A JP24968690A JPH04127800A JP H04127800 A JPH04127800 A JP H04127800A JP 24968690 A JP24968690 A JP 24968690A JP 24968690 A JP24968690 A JP 24968690A JP H04127800 A JPH04127800 A JP H04127800A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- acoustic matching
- piezoelectric
- lead wire
- electrodes
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 14
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 229920006332 epoxy adhesive Polymers 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000853 adhesive Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 239000011358 absorbing material Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler 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
- 239000000523 sample Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、金属探傷用プローブ等に使用される圧電トラ
ンスデユーサに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piezoelectric transducer used in metal flaw detection probes and the like.
［従来の技術］
従来、この種の圧電トランスデユーサは、例えば第５図
に示すように、円板状の圧電セラミックス１１の表側（
図においては上面）に信号側となるプラス電極１２を形
成する一方、裏側（図においては下面）にグランド側と
なるマイナス電極（図示せず）が形成され、かつ後述す
るリード線を同一側から導出するため、プラス電極１２
の一部を円弧状に切り欠き、この部分及び周面にマイナ
ス電極と電気的に接続した、いわゆる回し込み電極１３
が形成されている。そして、プラス電極１２及び回し込
み電極１３には、それぞれリード線１４．１５の一端が
接続されていると共に、プラス電極１２側には、円柱状
の音響吸収材 （図示せず）、又、マイナス電極側には
、円板状の音響整合材（図示せず）がそれぞれ接合され
て用いられるものである。[Prior Art] Conventionally, this type of piezoelectric transducer has been constructed by, for example, as shown in FIG.
A positive electrode 12 is formed on the signal side (top surface in the figure), and a negative electrode (not shown) is formed on the back side (bottom surface in the figure) as the ground side. In order to derive the positive electrode 12
A so-called winding electrode 13 is formed by cutting out a part in an arc shape and electrically connecting the negative electrode to this part and the circumferential surface.
is formed. One end of a lead wire 14.15 is connected to the positive electrode 12 and the winding electrode 13, respectively, and a cylindrical sound absorbing material (not shown) is connected to the positive electrode 12 side, and a negative Disc-shaped acoustic matching materials (not shown) are respectively bonded to the electrodes.
なお、各電極は、銀ペーストを塗布した後、焼付けを行
うことによって形成される。Note that each electrode is formed by applying silver paste and then baking it.
〔発明が解決しようとする課題Ｊ
しかしながら、上記従来の圧電トランスデユーサにおい
ては、回し込み電極の形成に手間がかかる一方、回し込
み電極の一部が信号側に形成されているため、プラス電
極の有効面積が圧電セラミックスの面積に対して小さく
なり、超音波発生の効率が低下し、かつ圧電的に不活性
な領域の発生により、超音波を放射したときの指向性が
低下するという問題がある。[Problem to be Solved by the Invention J] However, in the conventional piezoelectric transducer described above, it takes time and effort to form the winding electrode, and since a part of the winding electrode is formed on the signal side, the positive electrode The problem is that the effective area of the piezoelectric ceramic becomes smaller than the area of the piezoelectric ceramic, reducing the efficiency of ultrasonic generation, and the generation of piezoelectrically inactive areas reduces the directivity when emitting ultrasonic waves. be.
そこで、本発明は、製作が容易であると共に、パルス感
度及びパルス指向性の精度を向上し得る圧電トランスデ
ユーサの提供を目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a piezoelectric transducer that is easy to manufacture and can improve pulse sensitivity and pulse directivity accuracy.
［課題を解決するための手段］
前記課題を解決するため、本発明の圧電トランスデユー
サは、両面全面に電極を形成した板状の圧電セラミック
スの片面全面に接合される板状の音響整合材の面積を圧
電セラミックスの面積より大きく設け、この音響整合材
の圧電セラミックスとの接合面にその電極と接続されか
つ周辺部に至る電極を形成したものである。[Means for Solving the Problems] In order to solve the above-mentioned problems, the piezoelectric transducer of the present invention includes a plate-shaped acoustic matching material bonded to the entire surface of one side of a plate-shaped piezoelectric ceramic having electrodes formed on the entire surfaces of both surfaces. The area of the acoustic matching material is larger than the area of the piezoelectric ceramic, and an electrode is formed on the joint surface of the acoustic matching material with the piezoelectric ceramic to be connected to the electrode and reach the peripheral portion.
上記手段においては、音響整合材の電極に対するリード
線の接続により、マイナス電極との電気的導通がとれる
と共に、圧電セラミックスの両面に形成される電極の有
効面積が両者とも圧電セラミックスの面積と等しくなる
。In the above means, electrical continuity with the negative electrode is established by connecting the lead wire to the electrode of the acoustic matching material, and the effective areas of the electrodes formed on both sides of the piezoelectric ceramic are both equal to the area of the piezoelectric ceramic. .
〔実施例］
以下、本発明の一実施例を第１図、第２図を参照して説
明する。[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.
図中１は、円板状の圧電セラミックス （直径２０ｍｌ
１１、厚さ０．５ｍｍ１で、比誘電率＆ ／ Ｅ ｏ＝
５００、電気機械結合係数Ｋｔ＝ ５０％のＰＺＴ系材
料からなり、その信号側（第１図においては上面）及び
グランド側（第１図においては下面）には、それぞれ全
面に銀ペーストを焼付けして厚さ５〜１０μｍのプラス
電極２及びマイナス電極３が形成されている。1 in the figure is a disc-shaped piezoelectric ceramic (diameter 20ml)
11. At a thickness of 0.5 mm1, the relative dielectric constant & / E o =
500 and an electromechanical coupling coefficient Kt = 50%, and silver paste is baked on the entire surface of the signal side (top surface in Figure 1) and ground side (bottom surface in Figure 1). A positive electrode 2 and a negative electrode 3 having a thickness of 5 to 10 μm are formed.
４は圧電セラミックス１より大径の円板状の音響整合材
（直径２２ｍｍ、厚さ０．５ｍｍ１で、アルミナセラ
ミックスからなり、その片面（第１図においては上面）
全面には、銀ペーストを焼付けして厚さ５〜１０μｍの
電極５が形成されている。そして、音響整合材４は、そ
の電極５とマイナス電極３との間に介在したエポキシ系
の接着剤（図示せず）により圧電セラミックス１と同軸
的に接合されており、かつその電極５の周辺部にリード
線６の一端が半田付けされている。4 is a disk-shaped acoustic matching material with a larger diameter than piezoelectric ceramic 1 (diameter 22 mm, thickness 0.5 mm1, made of alumina ceramics, one side of which (top surface in Figure 1)
An electrode 5 having a thickness of 5 to 10 μm is formed on the entire surface by baking silver paste. The acoustic matching material 4 is coaxially joined to the piezoelectric ceramic 1 by an epoxy adhesive (not shown) interposed between the electrode 5 and the negative electrode 3, and is attached to the area around the electrode 5. One end of a lead wire 6 is soldered to the portion.
７は圧電セラミックスｌと同径の円柱状の音響吸収材（
直径２０Ｉ１ｍ、厚さ３０ｍｍ）で、硬度Ｄ＝５０のゴ
ム系の合成樹脂と充填剤との混合物からなり、エポキシ
系の接着剤（図示せず）により圧電セラミックス１のプ
ラス電極２に同軸的に接合されている。音響吸収材７の
周辺部には、軸方向に亘って円弧状の切欠部８が形成さ
れており、この切欠部８によって露出された圧電セラミ
ックス１のプラス電極２には、リード線９の一端が半田
付けされている。7 is a cylindrical acoustic absorbing material (
It is made of a mixture of a rubber-based synthetic resin with a hardness of D=50 and a filler, and is coaxially connected to the positive electrode 2 of the piezoelectric ceramic 1 using an epoxy adhesive (not shown). It is joined. An arcuate notch 8 is formed in the periphery of the acoustic absorbing material 7 in the axial direction, and one end of the lead wire 9 is attached to the positive electrode 2 of the piezoelectric ceramic 1 exposed by the notch 8. is soldered.
上記構成の圧電トランスデユーサを用いてパルス感度Ｓ
ｖ＝ ２０Ｉ２ｏｇ Ｖ ｏｕｔ／Ｖ ｉｎを測定し
たところ、第３図において曲線Ａで示すようになった。Using the piezoelectric transducer with the above configuration, pulse sensitivity S
When v=20I2og V out/V in was measured, the result was as shown by curve A in FIG.
曲１１１Ｂは、従来の圧電トランスデユーサのパルス感
度を示す。Track 111B shows the pulse sensitivity of a conventional piezoelectric transducer.
又、反射点までの距９１００ｍｍ及び２００＋ｗ＋＋＋
におけるパルス指向性を測定したところ、第４図におい
て曲ＭＣ及びＤで示すようになった０曲ＭＥ及びＦは、
従来の圧電トランスデユーサの反射点までの距ｌｔ１０
０ｍ１１及び２００ａ＋ｍにおけるパルス指向性を示し
、回し込み電極（直径１ｍｍ、切り欠き直径２ｍｍ）を
含む直径方向の値である。Also, the distance to the reflection point is 9100mm and 200+w+++
When we measured the pulse directivity in 0 songs ME and F, which are shown by songs MC and D in Fig. 4,
Distance to the reflection point of conventional piezoelectric transducer lt10
It shows the pulse directivity at 0 m11 and 200 a+m, and is the value in the diametrical direction including the wrapped electrode (1 mm diameter, notch diameter 2 mm).
従って、従来の圧電トランスデユーサに比し、パルス感
度及びパルス指向性が一段と向上しているのがわかる。Therefore, it can be seen that the pulse sensitivity and pulse directivity are much improved compared to the conventional piezoelectric transducer.
なお、上述した実施例においては、圧電セラミックスと
音響整合材を共に円板状とする場合について説明したが
、これに限らず両者共に方形板状、矩形板状、楕円板状
等としてもよく、あるいは両者を互いに異なる形状とし
てもよい。In addition, in the above-mentioned embodiment, the case where both the piezoelectric ceramics and the acoustic matching material are disk-shaped has been described, but the present invention is not limited to this, and both may be shaped like a rectangular plate, a rectangular plate, an elliptical plate, etc. Alternatively, both may have different shapes.
ただし、音響整合材は、圧電セラミックスのマイナス電
極と全面で接している必要がある。However, the acoustic matching material must be in full contact with the negative electrode of the piezoelectric ceramic.
又、音響整合材の電極は、片面全面に形成する場合に限
らず、例えば半径方向の矩形状として圧入
電セラミックスの電極と電気的に接続され、かつリード
線の接続ができるよう周辺部に延びていればよい。Furthermore, the electrodes of the acoustic matching material are not limited to being formed on the entire surface of one side; for example, they may be rectangular in the radial direction, electrically connected to the electrodes of the press-fit electric ceramics, and extending to the periphery so that lead wires can be connected. All you have to do is stay there.
以上のように本発明によれば、音響整合材の電極に対す
るリード線の接続により、マイナス電極との電気的導通
がとれるので、従来のように回し込み電極を形成する必
要がなくなり、電極の形成が容易となる。As described above, according to the present invention, electrical continuity with the negative electrode can be established by connecting the lead wire to the electrode of the acoustic matching material, so there is no need to form a wrap-around electrode as in the past, and the formation of the electrode becomes easier.
又、圧電セラミックスの両面に形成される電極の有効面
積が両者とも圧電セラミックスの面積と等しくなるので
、従来に比してパルス感度及びパルス指向性の精度を一
段と向上することができる。Further, since the effective areas of the electrodes formed on both sides of the piezoelectric ceramic are equal to the area of the piezoelectric ceramic, the accuracy of pulse sensitivity and pulse directivity can be further improved compared to the conventional method.
第１図、第２図は本発明の一実施例を示す圧電トランス
デユーサの縦断面図、平面図で、第３図、第４図はそれ
ぞれ上記圧電トランスデユーサのパルス感度特性図、パ
ルス指向特性図、第５図は従来の圧電トランスデユーサ
の要部の斜視図である。
１・・・圧電セラミックス ２・・・プラス電極３・・
・マイナス電極 ４・・・音響整合材５・・・電極
６・・・リード線７・・・音響吸収材
８・・・音響吸収材の切欠部９・・・リード線
第
図
第
図
第
図
、ｆ ４グ４．＃ ｚ”ｔ＞ １１１１ （ｍｍ）第
図
第
図1 and 2 are a longitudinal sectional view and a plan view of a piezoelectric transducer showing an embodiment of the present invention, and FIGS. 3 and 4 are a pulse sensitivity characteristic diagram and a pulse sensitivity characteristic diagram of the piezoelectric transducer, respectively. The directional characteristic diagram, FIG. 5, is a perspective view of the main parts of a conventional piezoelectric transducer. 1...Piezoelectric ceramics 2...Positive electrode 3...
- Negative electrode 4... Acoustic matching material 5... Electrode 6... Lead wire 7... Acoustic absorbing material 8... Notch of acoustic absorbing material 9... Lead wire diagram diagram diagram diagram diagram , f 4g 4. # z”t> 1111 (mm)
Claims (1)
スの片面全面に接合される板状の音響整合材の面積を圧
電セラミックスの面積より大きく設け、この音響整合材
の圧電セラミックスとの接合面にその電極と接続されか
つ周辺部に至る電極を形成したことを特徴とする圧電ト
ランスデューサ。(1) The area of the plate-shaped acoustic matching material to be bonded to the entire surface of one side of the plate-shaped piezoelectric ceramic having electrodes formed on the entire surface of both sides is larger than the area of the piezoelectric ceramic, and the bonding surface of this acoustic matching material with the piezoelectric ceramic A piezoelectric transducer characterized in that an electrode is formed which is connected to the electrode and extends to the peripheral part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24968690A JPH04127800A (en) | 1990-09-19 | 1990-09-19 | Piezoelectric transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24968690A JPH04127800A (en) | 1990-09-19 | 1990-09-19 | Piezoelectric transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04127800A true JPH04127800A (en) | 1992-04-28 |
Family
ID=17196697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24968690A Pending JPH04127800A (en) | 1990-09-19 | 1990-09-19 | Piezoelectric transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04127800A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002521163A (en) * | 1998-07-31 | 2002-07-16 | ボストン・サイアンティフィック・リミテッド | Off-aperture electrical connection for ultrasonic transducers |
-
1990
- 1990-09-19 JP JP24968690A patent/JPH04127800A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002521163A (en) * | 1998-07-31 | 2002-07-16 | ボストン・サイアンティフィック・リミテッド | Off-aperture electrical connection for ultrasonic transducers |
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