JPS63287199A - Ultrasonic probe - Google Patents
Ultrasonic probeInfo
- Publication number
- JPS63287199A JPS63287199A JP12110587A JP12110587A JPS63287199A JP S63287199 A JPS63287199 A JP S63287199A JP 12110587 A JP12110587 A JP 12110587A JP 12110587 A JP12110587 A JP 12110587A JP S63287199 A JPS63287199 A JP S63287199A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- piezoelectric plate
- signal
- ground electrode
- side 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.)
- Pending
Links
- 239000000523 sample Substances 0.000 title claims description 12
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、電気的な駆動パルスの印加により超音波を送
波し、あるいは受波した超音波を電気信号に変換する超
音波プローブに関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention transmits ultrasonic waves by applying electrical drive pulses, or converts received ultrasonic waves into electrical signals. Regarding ultrasonic probes.
（従来の技術）
超音波診断装置に用いられる超音波プローブは第７図の
ような構造を有している。駆動パルスと超音波との相互
変換機能を有する圧電性セラミック等から成る圧電板７
の厚み方向の表面には信号側電極１及びアース電極２が
各々設けられ、信号側電極１には信号引出線（板）３が
接続されると共にアース電極２にはアース引出線（板）
４が接続されている。画引出線３，４間にはバッキング
材（吸音材）８が設けられる。また圧電板７のアース電
極２側（超音波の送波又は受波を行う面）には整合Ｍ６
を介して音響レンズ５が設けられている。(Prior Art) An ultrasonic probe used in an ultrasonic diagnostic apparatus has a structure as shown in FIG. A piezoelectric plate 7 made of piezoelectric ceramic or the like that has a mutual conversion function between drive pulses and ultrasonic waves.
A signal side electrode 1 and a ground electrode 2 are provided on the surface in the thickness direction, and a signal lead wire (board) 3 is connected to the signal side electrode 1, and a ground lead wire (board) is connected to the ground electrode 2.
4 is connected. A backing material (sound absorbing material) 8 is provided between the drawing lines 3 and 4. In addition, the ground electrode 2 side of the piezoelectric plate 7 (the surface that transmits or receives ultrasonic waves) has a matching M6
An acoustic lens 5 is provided via.
第８図は前記圧電板７の断面構造を示すもので、アース
電極２は振動板７の端面７ａを回り込んで信号側電極１
の表面まで延長して設けられ、いわゆるまわし電極構造
になっている。これによって各電極１，２に対して振動
板７の同一面で各引出線３，４の接続を可能ならしめて
おり、引出線の負荷効果による圧電板７の振動異常を防
止している。FIG. 8 shows the cross-sectional structure of the piezoelectric plate 7, in which the ground electrode 2 goes around the end surface 7a of the diaphragm 7 and the signal side electrode 1
It has a so-called rotating electrode structure. This allows each lead wire 3, 4 to be connected to each electrode 1, 2 on the same surface of the diaphragm 7, and prevents abnormal vibration of the piezoelectric plate 7 due to the load effect of the lead wire.
しかしこの構造の圧電板７においては、超音波プローブ
として動作させた場合指向性の指向方向（音線方向）が
第８図のようにｙ軸方向から傾くという欠点がある。こ
れはｙ軸からみた両電極１゜２が非対称形状に設けられ
ていることに原因している。この欠点を除去するために
特公昭５８−２４０８０号公報に示されているように、
第９図のように信号側電極１及びアース電極２をｙ軸か
らみて、ずなわち圧電板７の長ざ方向の中央部からみて
対称形状に設けた超音波プローブが提供されている。However, the piezoelectric plate 7 having this structure has a drawback that when operated as an ultrasonic probe, the directivity direction (sound ray direction) is tilted from the y-axis direction as shown in FIG. This is due to the fact that both electrodes 1°2 are provided in an asymmetrical shape when viewed from the y-axis. In order to eliminate this drawback, as shown in Japanese Patent Publication No. 58-24080,
As shown in FIG. 9, an ultrasonic probe is provided in which the signal side electrode 1 and the ground electrode 2 are provided in a symmetrical shape when viewed from the y-axis, that is, when viewed from the center of the piezoelectric plate 7 in the longitudinal direction.
（発明が解決しようとする問題点）
ところでそのような従来の超音波プローブでは、圧電板
７の同一面で両電極１．２に引出線３゜４を接続しよう
とした場合に、特に第１０図のように信号側電極の位置
を端部の位置３ａでなく位＠３ｂのように引出線４に接
近して接続する場合には短絡防止の観点から絶縁部分ｄ
を設ける必要がある。このため結果として信号側電極１
の長さ寸法矛が制限されるので、開口寸法（超音波を送
受する面の寸法）が小さくなるという問題がある。(Problems to be Solved by the Invention) However, in such a conventional ultrasonic probe, when trying to connect the lead wires 3.4 to both electrodes 1.2 on the same surface of the piezoelectric plate 7, the 10th As shown in the figure, if the signal side electrode is connected close to the leader wire 4, not at the end position 3a but at position 3b, the insulating part d
It is necessary to provide Therefore, as a result, the signal side electrode 1
Since the length dimension is limited, there is a problem in that the opening dimension (the dimension of the surface that transmits and receives ultrasonic waves) becomes small.
本発明は以上のような問題に対処してなされたもので、
開口寸法を小ざくすることなく指向特性に優れた超音波
プローブを提供することを目的とするものである。The present invention has been made in response to the above-mentioned problems.
The object of the present invention is to provide an ultrasonic probe with excellent directional characteristics without reducing the aperture size.
［発明の構成］
（問題点を解決するための手段）
上記目的を連成するために本発明は、信号側電極及びア
ース電極が圧電板の長さ方向の中央部からみてほぼ対称
形状を有し、かつ信号側電極の両端部が圧電板の長さ方
向の端面から各々等しい長さ分除かれたことを特徴とし
ている。[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a structure in which the signal side electrode and the ground electrode have a substantially symmetrical shape when viewed from the center in the longitudinal direction of the piezoelectric plate. In addition, both ends of the signal side electrode are removed by an equal length from the longitudinal end face of the piezoelectric plate.
（作 用）
信号側電極及びアース電極がｙ軸からみてほぼ対称形状
を有しているので、゛指向方向がｙ軸から傾くことはな
くなる。また信号側電極の両端部が除かれていることに
より、アース電極との短絡防止が図れしかも開口寸法を
大きくすることができる。(Function) Since the signal side electrode and the ground electrode have a substantially symmetrical shape when viewed from the y-axis, the directivity direction will not be tilted from the y-axis. Further, by removing both ends of the signal side electrode, it is possible to prevent a short circuit with the ground electrode and to increase the opening size.
（実施例）
第１図は本発明の第１実施例の超音波プローブを示すも
ので、圧電性セラミック等から成る圧電板７の一表面に
は信号側電極１が設けられ、この信号側電極１の両端部
は圧電板７の端面７ａ。(Embodiment) FIG. 1 shows an ultrasonic probe according to a first embodiment of the present invention, in which a signal side electrode 1 is provided on one surface of a piezoelectric plate 7 made of piezoelectric ceramic or the like. Both ends of the piezoelectric plate 7 are end faces 7a of the piezoelectric plate 7.
７ｂから各々等しい長ざＬｌ、１２分除かれている。こ
の長ざＬｌ、Ｌ２は後述のアース電極２との短絡防止が
図れる最小限の寸法に設定される。7b by an equal length Ll of 12 minutes. The lengths Ll and L2 are set to minimum dimensions that can prevent short circuits with the earth electrode 2, which will be described later.
この信号側電極１の端部には信号引出線３が接続される
。圧電板７の他表面には圧電板７の端部７ａ、７ｂまで
回り込むようにアース電極２が設けられる。このアース
電極２の端面７ａにはアース引出線４が接続される。こ
れらアース引出線４及び信号引出線３の接続は導電性接
着剤等を用いて行われる。このように信号側電極１及び
アース電極２を圧電板７に設けることにより、両電極１
゜２をｙ軸からみて対称形状に配置できたことになる。A signal lead line 3 is connected to the end of the signal side electrode 1. A ground electrode 2 is provided on the other surface of the piezoelectric plate 7 so as to extend around the ends 7a and 7b of the piezoelectric plate 7. A ground lead wire 4 is connected to the end surface 7a of the ground electrode 2. The ground lead wire 4 and signal lead wire 3 are connected using a conductive adhesive or the like. By providing the signal side electrode 1 and the ground electrode 2 on the piezoelectric plate 7 in this way, both electrodes 1
This means that ゜2 can be arranged symmetrically when viewed from the y-axis.
次に本実施例の作用を説明する。Next, the operation of this embodiment will be explained.
信号側電極１とアース電極２間に各々引出線３゜４を介
して駆動パルスが印加されると、アース電極２側の圧電
板７の表面から超音波が送波される。When a driving pulse is applied between the signal side electrode 1 and the ground electrode 2 through the lead wires 3 and 4, ultrasonic waves are transmitted from the surface of the piezoelectric plate 7 on the ground electrode 2 side.
このときｙ軸からみて信号側電極１及びアース電極２は
対称形状に配置されているので、第２図のように指向（
音線）方向がｙ軸から傾くことはなくなる。また信号側
電極１の両端部が等しい長さ分除かれているので、アー
ス電極２との短絡防止が図られる。しかもその長ざＬｌ
、Ｌ２は最小限の寸法に設定されるので、開口寸法ｌ
を大きくとることができる。At this time, since the signal side electrode 1 and the ground electrode 2 are arranged symmetrically when viewed from the y-axis, the orientation (
The sound ray) direction will no longer be tilted from the y-axis. Further, since both ends of the signal side electrode 1 are removed by an equal length, short circuit with the ground electrode 2 can be prevented. Moreover, its length Ll
, L2 is set to the minimum dimension, so the opening dimension l
can be made larger.
第３図は第１実施例の変形例を示すもので、アース電極
２のうち一方の端面７ｂの回り込み分を除いた構造を示
すものである。この構造は電極の対称性が多少悪くなる
が、回り込み分の電極厚さは数μｍと極めて小さいため
実質的にほぼ対称性を保つことができるので、はぼ同等
の効果を得ることができる。FIG. 3 shows a modification of the first embodiment, and shows a structure in which one end face 7b of the ground electrode 2 is removed. Although this structure slightly deteriorates the symmetry of the electrode, since the thickness of the electrode around the wraparound portion is extremely small, ie, several micrometers, it is possible to maintain substantially the symmetry, so that almost the same effect can be obtained.
第４図は本発明の第２実施例を示すもので、アース電極
２を圧電板７の他表面のみに設けると共に信号側電極１
は第１実施例と同じ構造となし、信号側電極１及びアー
ス電極２の同一側の端部側に引出線３．４を接続するよ
うにしたものである。FIG. 4 shows a second embodiment of the present invention, in which the ground electrode 2 is provided only on the other surface of the piezoelectric plate 7, and the signal side electrode 1
The second embodiment has the same structure as the first embodiment, and a lead wire 3.4 is connected to the ends of the signal side electrode 1 and the ground electrode 2 on the same side.
本実施例によっても第１実施例とほぼ同等の効果を得る
ことができる。This embodiment also provides substantially the same effect as the first embodiment.
第５図は第２実施例の変形例を示すもので、アース電極
２の反対の端部側にも引出線４′を接続した構造を示す
ものである。本構造によればアース電極２に一対の引出
線４，４′を接続しているので、引出線の負荷効果によ
る振動異常を防止できるという利点が得られる。FIG. 5 shows a modification of the second embodiment, in which a lead wire 4' is also connected to the opposite end of the ground electrode 2. According to this structure, since the pair of lead wires 4, 4' are connected to the ground electrode 2, an advantage is obtained that vibration abnormality due to the load effect of the lead wires can be prevented.
第６図は本発明の第３実施例を示すもので、アース電極
２を端面７ａ、７ｂを回し込んで信号側電極１の表面ま
で延長して設けるようにしたものである。他の構造は第
１実施例と同一である。本実施例によっても第１実施例
と同等な効果を得ることができる。FIG. 6 shows a third embodiment of the present invention, in which a ground electrode 2 is provided by extending end faces 7a and 7b to the surface of the signal side electrode 1. The other structure is the same as the first embodiment. This embodiment also provides the same effects as the first embodiment.
このように本発明実施例によれば、圧電板７の同一面か
ら信号引出線３及びアース引出線４を引出す場合には、
託口寸法を大きくとることができる。これによって画引
出線を近接さぜることが可能になるので、信号線間のク
ロストークを低減することができる。また圧電板の長さ
方向の電極対称性を保つことにより、音線の傾きをより
小ざくできこれは特に関心領域が小ざな場合、指向性を
正確に保つ上で大きな利点となる。As described above, according to the embodiment of the present invention, when the signal leader line 3 and the ground leader line 4 are drawn out from the same surface of the piezoelectric plate 7,
The port size can be increased. This allows the image lead lines to be moved close to each other, thereby reducing crosstalk between signal lines. Furthermore, by maintaining electrode symmetry in the length direction of the piezoelectric plate, the inclination of the sound ray can be made smaller, which is a great advantage in maintaining accurate directivity, especially when the region of interest is small.
［発明の効果］
以上述べたように本発明によれば、開口寸法を小さくす
ることなく指向特性に優れた超音波プローブを得ること
ができる。[Effects of the Invention] As described above, according to the present invention, an ultrasonic probe with excellent directivity characteristics can be obtained without reducing the aperture size.
第１図は本発明の第１実施例の超音波プローブを示す断
面図、第２図は第１実施例の作用を説明する断面図、第
３図は第１実施例の変形例を示す断面図、第４図は本発
明の第２実施例を示す断面図、第５図は第２実施例の変
形例を示す断面図、第６図は本発明の第３実施例を示す
断面図、第７図・は超音波プローブの一例を示す斜視図
、第８図は従来例の断面図、第９図及び第１０図は他の
従来例の断面図でおる。
１・・・信号側電極、２・・・アース電極、３・・・信
号引出線、４・・・アース引出線、７・・・圧電板、７
ａ、７ｂ・・・端面。
代理人 弁理士 則 近 憲 佑同 近
藤 猛第７図FIG. 1 is a sectional view showing an ultrasonic probe according to a first embodiment of the present invention, FIG. 2 is a sectional view illustrating the operation of the first embodiment, and FIG. 3 is a sectional view showing a modification of the first embodiment. 4 is a sectional view showing a second embodiment of the invention, FIG. 5 is a sectional view showing a modification of the second embodiment, and FIG. 6 is a sectional view showing a third embodiment of the invention. FIG. 7 is a perspective view showing an example of an ultrasonic probe, FIG. 8 is a sectional view of a conventional example, and FIGS. 9 and 10 are sectional views of other conventional examples. DESCRIPTION OF SYMBOLS 1... Signal side electrode, 2... Earth electrode, 3... Signal leader line, 4... Earth leader line, 7... Piezoelectric plate, 7
a, 7b... end surface. Agent Patent Attorney Nori Ken Yudo Konfuji Takeshi Figure 7
Claims (1)
他表面に各々設けられた上部電極及び下部電極とを備え
、前記上部電極及び下部電極は圧電板の長さ方向の中央
部からみてほぼ対称形状を有し、かつ上部電極の両端部
は圧電板の長さ方向の端面から各々等しい長さ分除かれ
たことを特徴とする超音波プローブ。It comprises a rectangular piezoelectric plate, and an upper electrode and a lower electrode provided on one surface and the other surface of the piezoelectric plate in the thickness direction, respectively, and the upper electrode and the lower electrode are arranged in a direction from the central part in the length direction of the piezoelectric plate. 1. An ultrasonic probe having a substantially symmetrical shape when viewed from above, and having both ends of the upper electrode removed by an equal length from the longitudinal end face of the piezoelectric plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12110587A JPS63287199A (en) | 1987-05-20 | 1987-05-20 | Ultrasonic probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12110587A JPS63287199A (en) | 1987-05-20 | 1987-05-20 | Ultrasonic probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63287199A true JPS63287199A (en) | 1988-11-24 |
Family
ID=14803004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12110587A Pending JPS63287199A (en) | 1987-05-20 | 1987-05-20 | Ultrasonic probe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63287199A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0521594U (en) * | 1991-09-03 | 1993-03-19 | 沖電気工業株式会社 | Underwater receiver |
| JPH11347032A (en) * | 1998-06-04 | 1999-12-21 | Matsushita Electric Ind Co Ltd | Ultrasonic probe |
| JP2007167445A (en) * | 2005-12-22 | 2007-07-05 | Toshiba Corp | Ultrasonic probe |
-
1987
- 1987-05-20 JP JP12110587A patent/JPS63287199A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0521594U (en) * | 1991-09-03 | 1993-03-19 | 沖電気工業株式会社 | Underwater receiver |
| JPH11347032A (en) * | 1998-06-04 | 1999-12-21 | Matsushita Electric Ind Co Ltd | Ultrasonic probe |
| JP2007167445A (en) * | 2005-12-22 | 2007-07-05 | Toshiba Corp | Ultrasonic probe |
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