JP2837723B2 - Piezoelectric ultrasonic transducer - Google Patents
Piezoelectric ultrasonic transducerInfo
- Publication number
- JP2837723B2 JP2837723B2 JP2017781A JP1778190A JP2837723B2 JP 2837723 B2 JP2837723 B2 JP 2837723B2 JP 2017781 A JP2017781 A JP 2017781A JP 1778190 A JP1778190 A JP 1778190A JP 2837723 B2 JP2837723 B2 JP 2837723B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- piezoelectric vibrator
- wall
- electrode plates
- vibrator
- 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 - Fee Related
Links
Landscapes
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、魚群探知機などに用いられる圧電型超音
波振動子に関するものである。Description: TECHNICAL FIELD The present invention relates to a piezoelectric ultrasonic vibrator used for a fish finder and the like.
［従来の技術］ 現在、魚群探知機の送受波器には、PZT（ジルコン酸
チタン酸鉛）などを用いた圧電型超音波振動子が広く用
いられている。[Prior Art] Currently, a piezoelectric ultrasonic transducer using PZT (lead zirconate titanate) is widely used as a transducer of a fish finder.
第４図は従来のこの種の圧電型超音波振動子の構成の
概略を示す斜視図で、図において（10a）は圧電振動
子、（10b），（10c）はそれぞれ電極板、（11）は励振
源である。FIG. 4 is a perspective view schematically showing the structure of a conventional piezoelectric ultrasonic vibrator of this type, in which (10a) is a piezoelectric vibrator, (10b) and (10c) are electrode plates, respectively, and (11). Is the excitation source.
この圧電型超音波振動子は、円環状の圧電振動子（10
a）の外壁および内壁を電極板（10b），（10c）で覆
い、各電極板（10b），（10c）に励振源（11）を接続し
て、直接電圧効果と逆電圧効果との圧電現象（piezo el
ectric transducer）を利用している。This piezoelectric ultrasonic vibrator is an annular piezoelectric vibrator (10
a) Cover the outer and inner walls with electrode plates (10b) and (10c), connect the excitation source (11) to each electrode plate (10b) and (10c), Phenomenon (piezo el
ectric transducer).
なお圧電振動子（10a）には、PZTの他に水晶，ニオブ
酸リチウム（LiNbO3）などの単結晶やチタン酸バリウム
などのセラミックスを利用できるが、成形が容易でキュ
リー温度が高く（300゜）安定で圧電効果が大きいPZTが
広く利用されている。For the piezoelectric vibrator (10a), in addition to PZT, quartz, single crystal such as lithium niobate (LiNbO 3 ), or ceramics such as barium titanate can be used, but it is easy to mold and has a high Curie temperature (300 ° C). PZT, which is stable and has a large piezoelectric effect, is widely used.
第５図は第４図に示す圧電型超音波振動子の周波数特
性を示す図で、第５図に示すように、この圧電型超音波
振動子の周波数特性は円筒形の圧電振動子（10a）の径
の大きさによって決定され、単峰の比較的帯域幅の狭い
励振周波数を持つ。FIG. 5 is a diagram showing the frequency characteristics of the piezoelectric ultrasonic vibrator shown in FIG. 4. As shown in FIG. 5, the frequency characteristics of the piezoelectric ultrasonic vibrator have a cylindrical piezoelectric vibrator (10a). ) Is determined by the size of the diameter, and has a single-peak relatively narrow excitation frequency.
［発明が解決しようとする課題］ 上記のような従来の圧電型超音波振動子は以上のよう
に構成されており、その周波数特性は単峰の比較的帯域
幅の狭い励振周波数を持っているため、例えば魚群探知
機に使用する場合、広い励振周波数が必要になるチャー
プ信号技術や疑似雑音信号技術などの信号技術を利用す
ることが困難であるという問題点があった。[Problems to be Solved by the Invention] The conventional piezoelectric ultrasonic vibrator as described above is configured as described above, and its frequency characteristic has a single-peak relatively narrow excitation frequency. Therefore, for example, when used in a fish finder, there is a problem that it is difficult to use signal techniques such as a chirp signal technique and a pseudo noise signal technique that require a wide excitation frequency.
この発明はかかる課題を解決するためになされたもの
で、簡単な構成で広い帯域幅を持つ圧電型超音波振動子
を得ることを目的としている。The present invention has been made to solve such a problem, and has as its object to obtain a piezoelectric ultrasonic transducer having a simple configuration and a wide bandwidth.
［課題を解決するための手段］ この発明にかかる圧電型超音波振動子は、互いに径が
少しずつ異なる円環状または円錐台状の複数個の圧電振
動子ユニットを、各ユニットの径の大きさの順に、且つ
その軸心を一致させて順次積み重ね、または互いに隣接
する圧電振動子ユニットの間を機械的に結合して、一つ
の円錐筒状の圧電振動子を作成することとしたものであ
る。[Means for Solving the Problems] A piezoelectric ultrasonic vibrator according to the present invention includes a plurality of annular or frusto-conical piezoelectric vibrator units each having a diameter slightly different from each other. And the piezoelectric vibrator units adjacent to each other are mechanically connected to each other by mechanically connecting the piezoelectric vibrator units to form a conical cylindrical piezoelectric vibrator. .
［作用］ この発明においては上述のような構成とすることによ
り、僅かな差異を持たせて励振周波数の峰を重ね合わせ
ることができ、等価的に周波数の広帯域化がはかれるこ
ととなる。[Operation] In the present invention, by adopting the above-described configuration, the peaks of the excitation frequency can be overlapped with a slight difference, and the frequency band can be broadened equivalently.
［実施例］ 以下、この発明の実施例を図面を用いて説明する。第
１図はこの発明の一実施例を示す図で、第１図（Ａ）は
この発明の一実施例にかかる圧電型超音波振動子の構成
の概略を示す斜視図、第１図（Ｂ）はその部分断面図で
あり、図において（１）〜（３）はそれぞれ径の異なる
円錐台形の圧電型超音波振動子ユニット全体をそれぞれ
示し、（1a）〜（3a）はそれぞれ各圧電振動子ユニッ
ト、（1b）〜（3b）はそれぞれ各圧電振動子（1a）〜
（3a）の外径の壁を覆っている外壁電極板、（1c）〜
（3c）はそれぞれ各圧電振動子（1a）〜（3a）の内径の
壁を覆っている内壁電極板、（４）は各ユニット（１）
〜（３）の筒内に充填されたウレタンゴムなどの音響的
な特性が水に近い材質を持った内部充填材、（５）は各
ユニット（１）〜（３）の筒の外周面と筒の端面のうち
の径の小さい方の端面を覆っているコルクなどの音響的
反射材で形成された外部反射材、（６）は励振源を示
す。Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of the present invention, and FIG. 1 (A) is a perspective view schematically showing the structure of a piezoelectric ultrasonic vibrator according to one embodiment of the present invention, and FIG. ) Is a partial cross-sectional view, wherein (1) to (3) show the entire truncated-cone-shaped piezoelectric ultrasonic vibrator units having different diameters, respectively, and (1a) to (3a) show the respective piezoelectric vibrators. Child units, (1b) to (3b) are the respective piezoelectric vibrators (1a) to
The outer wall electrode plate covering the outer diameter wall of (3a), (1c) ~
(3c) is an inner wall electrode plate covering the inner diameter wall of each of the piezoelectric vibrators (1a) to (3a), and (4) is each unit (1)
(3) an internal filler having a material whose acoustic characteristics are close to water, such as urethane rubber filled in the cylinder; (5) is an outer peripheral surface of the cylinder of each unit (1) to (3); An external reflector formed of an acoustic reflector, such as cork, covering the smaller diameter end face of the end faces of the tube, and (6) indicates an excitation source.
第１図に示すように、この実施例における圧電型超音
波振動子（1a）〜（3a）を複数個軸心を一致させて順次
積み重ね、各圧電振動子（1a）〜（3a）の外壁にはそれ
ぞれ外壁電極板（1b）〜（3b）を、内壁にはそれぞれ内
壁電極板（1c）〜（3c）を設け、各外壁電極板（1b）〜
（3b）を並列に相互に接続して一方の電極板とし、各内
壁電極板（1c）〜（3c）の間を並列に相互に接続して他
方の電極板とし、これらの電極板に励振源（６）を接続
して、一つの円錐筒状の圧電型超音波振動子を構成して
いる。そして第１図では省略しているが、圧電型超音波
振動子全体をウレタンゴムなどにより防水被覆してお
り、筒の端面のうち径の大きい方の端面を超音波の送受
波面としている。As shown in FIG. 1, a plurality of piezoelectric ultrasonic vibrators (1a) to (3a) in this embodiment are sequentially stacked with their axes aligned, and the outer wall of each of the piezoelectric vibrators (1a) to (3a) is Are provided with outer wall electrode plates (1b) to (3b), respectively, and the inner wall is provided with inner wall electrode plates (1c) to (3c), respectively.
(3b) are connected to each other in parallel to form one electrode plate, and the inner wall electrode plates (1c) to (3c) are connected to each other in parallel to form another electrode plate, and these electrode plates are excited. The source (6) is connected to form one conical cylindrical piezoelectric ultrasonic vibrator. Although not shown in FIG. 1, the entirety of the piezoelectric ultrasonic vibrator is waterproof-coated with urethane rubber or the like, and the end face having the larger diameter among the end faces of the cylinder is used as the ultrasonic wave transmitting / receiving surface.
各ユニット（１）〜（３）におけるそれぞれの励振周
波数は、その径に反比例するので、ユニット（１）の励
振周波数f1は（D1＋D2）/2,ユニット（２）の励振周波
数f2は（D2＋D3）/2,ユニット（３）の励振周波数f3は
（D3＋D4）/2となり、全体としては第２図に示すような
励振周波数となり、等価的に周波数の広帯域化をはかる
ことができる。Since the excitation frequency of each unit (1) to (3) is inversely proportional to its diameter, the excitation frequency f 1 of the unit (1) is (D 1 + D 2 ) / 2, and the excitation frequency f of the unit (2) 2 is (D 2 + D 3 ) / 2, and the excitation frequency f 3 of the unit (3) is (D 3 + D 4 ) / 2. As a whole, the excitation frequency is as shown in FIG. Broadband can be achieved.
なお上記実施例は、各圧電型超音波振動子ユニット
（１）〜（３）全体を、それぞれ圧電振動子ユニット
（1a）〜（3a）で形成して、各ユニット（１）〜（３）
を積み重ねているが、各圧電型超音波振動子ユニット
（１）〜（３）の一部に圧電振動子ユニット（1a）〜
（3a）を用い、各ユニット（１）〜（３）の間を機械的
に結合して、一つの円錐筒状の圧電振動子を形成しても
よい。In the above embodiment, the entire piezoelectric ultrasonic vibrator units (1) to (3) are respectively formed by the piezoelectric vibrator units (1a) to (3a), and the respective units (1) to (3) are formed.
Are stacked, and a part of each of the piezoelectric ultrasonic vibrator units (1) to (3) has a piezoelectric vibrator unit (1a) to
Using (3a), the units (1) to (3) may be mechanically connected to form a single conical cylindrical piezoelectric vibrator.
第３図はこの発明の他の実施例を示す図で、第３図
（Ａ）はそれぞれ径の異なる円筒形のユニット（１）〜
（３）を複数個並列に積み重ねたもの、第３図（Ｂ）は
各ユニット（１）〜（３）を初めから一体として同一圧
電材料で形成したものであり、第１図に示す圧電型超音
波振動子と同様にして、等価的な周波数の広帯域化をは
かることができる。FIG. 3 shows another embodiment of the present invention. FIG. 3 (A) shows cylindrical units (1) to (4) having different diameters.
A plurality of (3) are stacked in parallel, and FIG. 3 (B) is a unit in which the units (1) to (3) are integrally formed of the same piezoelectric material from the beginning, and the piezoelectric type shown in FIG. As in the case of the ultrasonic vibrator, an equivalent frequency band can be widened.
なお、この発明はこれらの実施例に限定されることな
く、各ユニット（１）〜（３）それぞれの長さが異なる
ものを用いたり、ラッパ管状のものを用いる等、種々の
形状が考えられ、形状を調整することにより、周波数特
性を調整してチャープ信号技術や疑似雑音信号技術に適
する圧電型超音波振動子とすることができ、この発明を
利用することにより魚群探知機にも種々の信号処理技術
を用いることができるようになる。The present invention is not limited to these embodiments, and various shapes are conceivable, such as using units (1) to (3) having different lengths, or using a trumpet-shaped unit. By adjusting the shape, the frequency characteristics can be adjusted to make a piezoelectric ultrasonic transducer suitable for chirp signal technology and pseudo noise signal technology. By using the present invention, various types of fish finder can be used. Signal processing technology can be used.
［発明の効果］ この発明は以上説明したように、僅かな差異を持たせ
て励振周波数の峰を重ね合わせることができ、その結果
として周波数の広帯域化をはかることができ、チャープ
信号技術や疑似雑音信号技術など、これまで魚群探知機
では容易に用いることができなかった信号処理技術を利
用することができるようになり、魚群探知機の高感度
化，低消費電力化，小型化に大きく寄与することができ
るという効果がある。[Effects of the Invention] As described above, according to the present invention, peaks of excitation frequencies can be overlapped with a slight difference, and as a result, the frequency can be broadened. It is now possible to use signal processing technologies such as noise signal technology that could not be used easily with fish finder, which greatly contributes to higher sensitivity, lower power consumption, and smaller size of fish finder. There is an effect that can be.
第１図はこの発明の一実施例を示す図、第２図は第１図
に示す実施例における圧電型超音波振動子の周波数特性
を示す図、第３図はこの発明の他の実施例を示す図、第
４図は従来の圧電型超音波振動子の構成を示す図、第５
図は第４図に示す従来の圧電型超音波振動子の周波数特
性を示す図。 （１）〜（３）はそれぞれ圧電型超音波振動子ユニッ
ト、（1a）〜（3a）はそれぞれ圧電振動子ユニット、
（1b）〜（3b）はそれぞれ外壁電極板、（1c）〜（3c）
はそれぞれ内壁電極板、（４）は内部充填材、（５）は
外部反射材、（６）は励振源。1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing the frequency characteristics of the piezoelectric ultrasonic vibrator in the embodiment shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a diagram showing the configuration of a conventional piezoelectric ultrasonic vibrator, and FIG.
The figure is a figure which shows the frequency characteristic of the conventional piezoelectric ultrasonic transducer shown in FIG. (1) to (3) are piezoelectric ultrasonic vibrator units, (1a) to (3a) are piezoelectric vibrator units,
(1b) to (3b) are outer wall electrode plates, respectively (1c) to (3c)
Is an inner wall electrode plate, (4) is an internal filler, (5) is an external reflector, and (6) is an excitation source.
Claims (1)
の電極板の間に励振源を接続し、直接電圧効果と逆電圧
効果を得る圧電型超音波振動子において、 互いに径が少しずつ異なる円環状または円錐台状の複数
個の圧電振動子ユニットを、各ユニットの径の大きさの
順に、且つその軸心を一致させて順次積み重ね、または
互いに隣接する圧電振動子ユニットの間を機械的に結合
して、一つの円錐筒状の圧電振動子を形成する手段、 上記各圧電振動子ユニットの外径の壁に外壁電極板を、
内径の壁に内壁電極板を設け、各外壁電極板を並列に接
続した接続線と内壁電極板を並列に接続した接続線との
間に励振源を接続する手段、 上記円錐筒状の圧電振動子の筒内を音響的性質が水に近
い物質を充填し、筒の外周面と筒の端面のうち径の小さ
い方の端面とを超音波に対する反射材で覆い、筒の端面
のうち、径の大きい方の端面を超音波の送受波面とする
手段、 を備えたことを特徴とする圧電型超音波振動子。1. A piezoelectric ultrasonic vibrator in which electrode plates are provided on both sides of a piezoelectric vibrator and an excitation source is connected between these electrode plates to obtain a direct voltage effect and a reverse voltage effect, the diameters of which are slightly different from each other. A plurality of ring-shaped or frusto-conical piezoelectric vibrator units are sequentially stacked in the order of the diameter of each unit and with their axes aligned, or mechanically arranged between adjacent piezoelectric vibrator units. Means for forming one conical cylindrical piezoelectric vibrator, an outer wall electrode plate on the outer diameter wall of each piezoelectric vibrator unit,
Means for providing an inner wall electrode plate on the inner diameter wall, connecting an excitation source between a connection line connecting the outer wall electrode plates in parallel and a connection line connecting the inner wall electrode plates in parallel, the conical cylindrical piezoelectric vibration The inside of the tube is filled with a substance having acoustic properties similar to water, and the outer peripheral surface of the tube and the smaller end surface of the end surface of the tube are covered with a reflective material for ultrasonic waves. Means for using an end face having a larger value as a wave transmitting / receiving surface for ultrasonic waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017781A JP2837723B2 (en) | 1990-01-30 | 1990-01-30 | Piezoelectric ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017781A JP2837723B2 (en) | 1990-01-30 | 1990-01-30 | Piezoelectric ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03224400A JPH03224400A (en) | 1991-10-03 |
| JP2837723B2 true JP2837723B2 (en) | 1998-12-16 |
Family
ID=11953263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017781A Expired - Fee Related JP2837723B2 (en) | 1990-01-30 | 1990-01-30 | Piezoelectric ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2837723B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008024856A1 (en) * | 2008-05-23 | 2009-11-26 | Biotronik Crm Patent Ag | Piezoelectric transducer for use in piezoelectric transformer, has ceramic body exhibiting piezoelectric effect in polarization direction, where body has different thicknesses in regions in polarization direction |
| WO2011162002A1 (en) | 2010-06-25 | 2011-12-29 | 京セラ株式会社 | Acoustic generator |
| US20200276606A1 (en) * | 2017-11-20 | 2020-09-03 | Auckland University Of Technology | Stepped cylindrical piezoelectric transducer |
| CN109085252B (en) * | 2018-10-23 | 2021-06-25 | 王河 | Manufacturing method of flat-bottom test block for ultrasonic detection |
| JP7312420B1 (en) * | 2022-07-26 | 2023-07-21 | 本多電子株式会社 | Ultrasonic transducer for measuring equipment |
-
1990
- 1990-01-30 JP JP2017781A patent/JP2837723B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03224400A (en) | 1991-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5321332A (en) | Wideband ultrasonic transducer | |
| EP0169727A2 (en) | Broadband radial vibrator transducer | |
| WO2010032463A1 (en) | Sound reproducing apparatus | |
| JPH0453117Y2 (en) | ||
| JP2837723B2 (en) | Piezoelectric ultrasonic transducer | |
| JPH0695088B2 (en) | Ultrasonic transducer | |
| JP2837722B2 (en) | Piezoelectric ultrasonic transducer | |
| JP2671855B2 (en) | Underwater acoustic transmitter | |
| JP3485904B2 (en) | Sound transducer | |
| JPH0511711B2 (en) | ||
| JPH03270599A (en) | Composite piezoelectric body | |
| JP3455585B2 (en) | Aerial ultrasonic transducer | |
| JPH0311898A (en) | Wave transmitter-receiver | |
| JPS6123913Y2 (en) | ||
| JP3119218B2 (en) | Vibration source for transmitter | |
| JPH02238799A (en) | Transmitter-receiver for sonar | |
| JPS599514Y2 (en) | Electrostrictive ultrasonic vibrator | |
| JPS632071B2 (en) | ||
| JPH0142034Y2 (en) | ||
| JPS6117671Y2 (en) | ||
| JPS61179700A (en) | Ultrasonic wave probe | |
| JPS6169300A (en) | Ultrasonic probe | |
| JPH02186800A (en) | Elliptic cylinder bending type echo sounder transmitter-receiver | |
| JPS6365200B2 (en) | ||
| JPH05183995A (en) | Composite piezoelectric body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081009 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091009 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |