JP2768107B2 - Bolted Langevin vibrator with acoustic matching plate - Google Patents
Bolted Langevin vibrator with acoustic matching plateInfo
- Publication number
- JP2768107B2 JP2768107B2 JP4020877A JP2087792A JP2768107B2 JP 2768107 B2 JP2768107 B2 JP 2768107B2 JP 4020877 A JP4020877 A JP 4020877A JP 2087792 A JP2087792 A JP 2087792A JP 2768107 B2 JP2768107 B2 JP 2768107B2
- Authority
- JP
- Japan
- Prior art keywords
- acoustic matching
- matching plate
- langevin vibrator
- piezoelectric ceramic
- front mass
- 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 - Lifetime
Links
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 8
- 229920001721 polyimide Polymers 0.000 claims description 7
- 239000009719 polyimide resin Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 description 7
- 229920000647 polyepoxide Polymers 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は水中での通信やソーナー
に要求される水中超音波トランスジューサー用の音響整
合板付きボルト締めランジュバン振動子（以下ランジュ
バン振動子と略称する）に関し、特に、ハイパワー・長
時間使用に適するランジュバン振動子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolted Langevin vibrator (hereinafter abbreviated as Langevin vibrator) with an acoustic matching plate for an underwater ultrasonic transducer required for underwater communication and sonar. It relates to a Langevin vibrator suitable for power and long-time use.
【０００２】[0002]
【従来の技術】従来のこの種のランジュバン振動子につ
いて、図３の断面図を参照して説明する。2. Description of the Related Art A conventional Langevin vibrator of this type will be described with reference to a sectional view of FIG.
【０００３】このランジュバン振動子は、アルミ合金，
チタン合金，ステンレス鋼などの高剛性材料で形成され
たフロントマス１１の一端に電気信号端子２１および２
２からの電気信号を超音波振動に変換するリング状かつ
スタック型の圧電セラミック１２を接合させている。こ
の圧電セラミック１２の他端は、フロントマス１２と同
様の高剛性材料で形成されたリアマス１３の一端に接合
している。そして、フロントマス１１とリアマス１３と
の間に配置されている圧電セラミック１２は、クロムモ
リブデン鋼などの高張力合金で形成され上記両マス１１
と１３との間を締め付けるボルト１４およびナット１５
によって圧縮応力を加えられている。また、フロントマ
ス１１の他端には、水とフロントマス１１との間で広帯
域のインピーダンス整合特性が得られるエポキシ系樹脂
で形成された音響整合板１６Ａが接着されている。This Langevin vibrator is made of an aluminum alloy,
Electric signal terminals 21 and 2 are connected to one end of a front mass 11 made of a highly rigid material such as a titanium alloy or stainless steel.
The ring-shaped and stacked-type piezoelectric ceramics 12 for converting the electric signal from the second to the ultrasonic vibration are joined. The other end of the piezoelectric ceramic 12 is joined to one end of a rear mass 13 formed of the same high rigidity material as the front mass 12. The piezoelectric ceramic 12 disposed between the front mass 11 and the rear mass 13 is formed of a high-tensile alloy such as chromium molybdenum steel.
14 and nut 15 for tightening between the bolts 13 and 13
Compressive stress. At the other end of the front mass 11, an acoustic matching plate 16A made of an epoxy resin that provides a wide-band impedance matching characteristic between water and the front mass 11 is adhered.
【０００４】上述したランジュバン振動子は、音響整合
板１６Ａに用いられるエポキシ系樹脂のインピーダンス
整合性ならびにフロントマス１１との接着性の良さなど
から、広帯域，かつ高効率ハイパワー駆動が可能である
という特徴を有している。一方、エポキシ系樹脂は金属
に比べ機械的損失ｔａｎδが大きいという欠点も有して
いる。The above-mentioned Langevin vibrator can be driven in a wide band and with high efficiency and high power because of the impedance matching of the epoxy resin used for the acoustic matching plate 16A and the good adhesion to the front mass 11. Has features. On the other hand, the epoxy resin also has a disadvantage that the mechanical loss tan δ is larger than that of metal.
【０００５】図４は図３に示した音響振動板１６Ａに使
用するエポキシ系樹脂の貯蔵弾性率Ｅと機械的損失ｔａ
ｎδの温度特性を示す図である。上述した図１のランジ
ュバン振動子では、長時間ハイパワー駆動した場合に
は、エポキシ系樹脂で形成されている音響整合板１６が
超音波振動により内部発熱を生じて温度上昇を起す。そ
してこの温度がエポキシ系樹脂のガラス転移温度である
６０°Ｃより高くなると音響整合板１６の機械的損失ｔ
ａｎδが増加し、整合板１６は加速度的に発熱し温度上
昇する。また、貯蔵弾性率Ｅは音響整合板１６の音響イ
ンピーダンスと比例関係にあるので、上記温度の上昇に
伴なって電気信号端子２１，２２から見た入力インピー
ダンスも急激に変化し、電気信号を送出する送信器（図
示せず）とこのランジュバン振動子とのインピーダンス
整合がとれず、ハイパワー駆動ができないという状態と
なる。さらに、このような状態では、音響整合板１６は
ゴム上となって剛性が失われるため、特に水圧下で使用
する場合は、図３の仮想線で示すように水圧による大変
形や、この変形に伴うフロントマス１１との接着部剥離
を起してこのランジュバン振動子の完全な使用不可状態
を起す。このため、従来技術のランジュバン振動子はハ
イパワー下で長時間駆動をすることができなかった。FIG. 4 shows the storage modulus E and the mechanical loss ta of the epoxy resin used for the acoustic diaphragm 16A shown in FIG.
It is a figure which shows the temperature characteristic of ndelta. In the Langevin vibrator shown in FIG. 1 described above, when the high-power driving is performed for a long time, the acoustic matching plate 16 formed of an epoxy resin generates internal heat due to ultrasonic vibration, thereby causing a temperature rise. When this temperature exceeds 60 ° C., which is the glass transition temperature of the epoxy resin, the mechanical loss t of the acoustic matching plate 16 is reduced.
The value of an increases, and the matching plate 16 generates heat at an accelerated rate and rises in temperature. Further, since the storage elastic modulus E is proportional to the acoustic impedance of the acoustic matching plate 16, the input impedance seen from the electric signal terminals 21 and 22 rapidly changes with the rise of the temperature, and the electric signal is transmitted. The impedance matching between the transmitter (not shown) and the Langevin vibrator cannot be achieved, and high power driving cannot be performed. Further, in such a state, the acoustic matching plate 16 is on rubber and loses its rigidity. Therefore, when the acoustic matching plate 16 is used under water pressure, large deformation due to water pressure as shown by a virtual line in FIG. As a result, the bonded portion with the front mass 11 is peeled off, and a completely unusable state of the Langevin vibrator is caused. For this reason, the conventional Langevin vibrator cannot be driven for a long time under high power.
【０００６】[0006]
【発明が解決しようとする課題】従って本発明は、上述
の従来技術による欠点を解消することにあり、上記圧電
セラミックの高温使用限界まで使用でき、従って長時間
のハイパワー駆動が可能であり、さらには耐久性および
信頼性が高い音響整合板付きボルト締めランジュバン振
動子を提供することにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and it is possible to use the piezoelectric ceramic up to the high-temperature use limit, and thus it is possible to perform high-power driving for a long time. Another object of the present invention is to provide a bolted Langevin vibrator with an acoustic matching plate having high durability and reliability.
【０００７】[0007]
【課題を解決するための手段】本発明の音響整合板付き
ボルト締めランジュバン振動子は、高剛性材料で形成さ
れたフロントマスと、一端が前記高剛性材料の一端に接
合し電気信号を超音波に変換する圧電セラミックと、一
端が前記圧電セラミックの他端に接合し高剛性材料で形
成されたリアマスと、前記フロントマスと前記圧電セラ
ミックと前記リアマスとを締め付けるボルトおよびナッ
トと、前記フロントマスの他端に接合され水と前記フロ
ントマスとのインピーダンス整合をとるための音響整合
板とを有する音響整合板付きボルト締めランジュバン振
動子において、前記音響整合板が、前記圧電セラミック
のキュリー温度より高いガラス転移温度を有する合成樹
脂であることを特徴としている。According to the present invention, a bolted Langevin vibrator with an acoustic matching plate according to the present invention has a front mass formed of a highly rigid material, and one end joined to one end of the high rigid material to convert an electric signal into an ultrasonic wave. A piezoelectric ceramic, one end of which is joined to the other end of the piezoelectric ceramic, a rear mass formed of a highly rigid material, a bolt and a nut for tightening the front mass, the piezoelectric ceramic, and the rear mass, In a bolted Langevin vibrator with an acoustic matching plate joined to the other end and having an acoustic matching plate for impedance matching between water and the front mass, the acoustic matching plate has a glass higher than the Curie temperature of the piezoelectric ceramic. It is a synthetic resin having a transition temperature.
【０００８】[0008]
【実施例】次に本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【０００９】図１は本発明の一実施例の断面図である。
また、図２は図１の音響整合板１６に使用するポリイミ
ド系樹脂の貯蔵弾性率Ｅと機械的損失ｔａｎδの温度特
性を示す図である。FIG. 1 is a sectional view of one embodiment of the present invention.
FIG. 2 is a diagram showing the temperature characteristics of the storage elastic modulus E and the mechanical loss tan δ of the polyimide resin used for the acoustic matching plate 16 of FIG.
【００１０】図１のランジュバン振動子は、図２に示し
た従来技術によるフロントマス１１，圧電セラミック１
２，圧電セラミック１２の電気信号端子２１および２
２，リアマス１３，ボルト１４およびナット１５を有し
ている。フロントマス１１の他端１１ａにはポリイミド
系接着剤等の耐熱接着剤で接着するか、またはモールド
による一体成形によってポリイミド系樹脂で形成された
音響整合板１６を接合配置している。The Langevin vibrator shown in FIG. 1 has a front mass 11 and a piezoelectric ceramic 1 shown in FIG.
2, electric signal terminals 21 and 2 of piezoelectric ceramic 12
2, a rear mass 13, a bolt 14, and a nut 15. An acoustic matching plate 16 made of a polyimide resin is bonded to the other end 11a of the front mass 11 with a heat-resistant adhesive such as a polyimide adhesive or by integral molding using a mold.
【００１１】上記音響整合板１６に使用したポリイミド
系樹脂の貯蔵弾性率Ｅと機械的損失ｔａｎδの温度特性
を説明すると、この樹脂は図示されていない０°Ｃから
図示されている約４００°Ｃに到るまで、機械的損失ｔ
ａｎδがピーク値を描くガラス転移温度に達することが
なく５×１０のマイナス２乗以下を維持し、また、貯蔵
弾性率Ｅは温度上昇に伴ってゆるやかに低下するものの
ほとんど変化しなかった。従って圧電セラミック１２の
圧電性が失われるキュリー温度である約３００°Ｃにお
いても音響整合板１６の実部および虚部の音響インピー
ダンスは変化せず、圧電セラミック１２の高温使用限界
までこのランジュバン振動子のハイパワー駆動が可能で
ある。このハイパワー駆動時間は従来技術によるランジ
ュバン振動子の約３倍に達した。さらに、音響整合板１
６の剛性も約４００°Ｃに至るような高温まで保たれる
ので、水圧下におけるこの音響整合板１６の変形やフロ
ントマス１１からの剥離も発生しない。The temperature characteristics of the storage elastic modulus E and the mechanical loss tan δ of the polyimide resin used for the acoustic matching plate 16 will be described. The temperature of the resin ranges from 0 ° C. (not shown) to about 400 ° C. Until the mechanical loss t
An δ did not reach the glass transition temperature at which the peak value was reached, and was kept at or below 5 × 10 −2, and the storage modulus E gradually decreased with increasing temperature, but hardly changed. Therefore, the acoustic impedance of the real part and the imaginary part of the acoustic matching plate 16 does not change even at a Curie temperature of about 300 ° C. at which the piezoelectricity of the piezoelectric ceramic 12 is lost. High-power driving is possible. This high-power driving time reached about three times that of the Langevin oscillator according to the prior art. Further, the acoustic matching plate 1
Since the rigidity of the acoustic matching plate 6 is also maintained at a high temperature of about 400 ° C., neither deformation of the acoustic matching plate 16 under water pressure nor separation from the front mass 11 occurs.
【００１２】[0012]
【発明の効果】以上説明したように本発明は、ランジュ
バン振動子の音響整合板にポリイミド系樹脂等の圧電セ
ラミックのキュリー温度より高いガラス転移温度を有す
る合成樹脂を使用することにより、この音響整合板の温
度が上記圧電セラミックのキュリー温度まで上昇したと
しても、この音響整合板の音響インピーダンスの変化を
わずかな値にに止めることができる。この結果、このラ
ンジュバン振動子を長時間にわたってハイパワー駆動が
できるという効果を生じる。また、約３００°Ｃの高温
においても音響整合板の変形や音響整合板とフロントマ
スとの剥離が生じないので、このランジュバン振動子の
長時間連続使用に対する耐久性および信頼性を向上させ
るという効果も有する。As described above, the present invention provides an acoustic matching plate for a Langevin vibrator using a synthetic resin having a glass transition temperature higher than the Curie temperature of a piezoelectric ceramic such as a polyimide resin. Even if the temperature of the plate rises to the Curie temperature of the piezoelectric ceramic, the change in acoustic impedance of the acoustic matching plate can be kept to a small value. As a result, there is an effect that the Langevin vibrator can be driven with high power for a long time. Further, even at a high temperature of about 300 ° C., deformation of the acoustic matching plate and separation of the acoustic matching plate from the front mass do not occur, so that the durability and reliability of the Langevin vibrator for long-term continuous use are improved. Also have.
【図１】本発明の一実施例の断面図である。FIG. 1 is a sectional view of one embodiment of the present invention.
【図２】図１の音響整合板１６に使用するポリイミド系
樹脂の貯蔵弾性率Ｅと機械的損失ｔａｎδの温度特性を
示す図である。FIG. 2 is a diagram showing temperature characteristics of storage elastic modulus E and mechanical loss tan δ of a polyimide resin used for the acoustic matching plate 16 of FIG.
【図３】従来の音響整合板付きボルト締めランジュバン
振動子の断面図である。FIG. 3 is a sectional view of a conventional bolted Langevin vibrator with an acoustic matching plate.
【図４】図３に示した音響振動板１６Ａに使用するエポ
キシ系樹脂の貯蔵弾性率Ｅと機械的損失ｔａｎδの温度
特性を示す図である。FIG. 4 is a diagram showing temperature characteristics of storage elastic modulus E and mechanical loss tan δ of an epoxy resin used for the acoustic diaphragm 16A shown in FIG.
１１ フロントマス １１ａ 他端 １２ 圧電セラミック １３ リアマス １４ ボルト １５ ナット １６，１６Ａ 音響整合板 ２１，２２ 電気信号端子 DESCRIPTION OF SYMBOLS 11 Front mass 11a The other end 12 Piezoelectric ceramic 13 Rear mass 14 Bolt 15 Nut 16, 16A Acoustic matching plate 21, 22 Electric signal terminal
Claims (2)
と、一端が前記高剛性材料の一端に接合し入力電気信号
を超音波に変換する圧電セラミックと、一端が前記圧電
セラミックの他端に接合し高剛性材料で形成されたリア
マスと、前記フロントマスと前記圧電セラミックと前記
リアマスとを互いに締め付けるボルトおよびナットと、
前記フロントマスの他端に接合され水と前記フロントマ
スとのインピーダンス整合をとるための音響整合板とを
有する音響整合板付きボルト締めランジュバン振動子に
おいて、前記音響整合板が、前記圧電セラミックのキュ
リー温度より高いガラス転移温度を有する合成樹脂であ
ることを特徴とする音響整合板付きボルト締めランジュ
バン振動子。1. A front mass formed of a high-rigidity material, a piezoelectric ceramic having one end bonded to one end of the high-rigidity material and converting an input electric signal into ultrasonic waves, and one end bonded to the other end of the piezoelectric ceramic. A rear mass formed of a highly rigid material, a bolt and a nut for fastening the front mass, the piezoelectric ceramic, and the rear mass together,
In a bolted Langevin vibrator with an acoustic matching plate, which is joined to the other end of the front mass and has an acoustic matching plate for impedance matching between water and the front mass, the acoustic matching plate is formed of a curie of the piezoelectric ceramic. A bolted Langevin vibrator with an acoustic matching plate, which is a synthetic resin having a glass transition temperature higher than the temperature.
ることを特徴とする請求項１記載の音響整合板付きボル
ト締めランジュバン振動子。2. The Langevin vibrator with an acoustic matching plate according to claim 1, wherein the synthetic resin is a polyimide resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4020877A JP2768107B2 (en) | 1992-02-06 | 1992-02-06 | Bolted Langevin vibrator with acoustic matching plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4020877A JP2768107B2 (en) | 1992-02-06 | 1992-02-06 | Bolted Langevin vibrator with acoustic matching plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05236598A JPH05236598A (en) | 1993-09-10 |
| JP2768107B2 true JP2768107B2 (en) | 1998-06-25 |
Family
ID=12039418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4020877A Expired - Lifetime JP2768107B2 (en) | 1992-02-06 | 1992-02-06 | Bolted Langevin vibrator with acoustic matching plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2768107B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150326147A1 (en) * | 2012-11-29 | 2015-11-12 | Daicel Corporation | Elastic body for actuator, and piezoelectric actuator |
| JPWO2014084183A1 (en) * | 2012-11-29 | 2017-01-05 | 株式会社ダイセル | Elastic body for actuator and piezoelectric actuator |
| DE212021000553U1 (en) * | 2021-04-15 | 2023-12-06 | W. L. Gore & Associates, Inc. | Hybrid supported acoustic membrane assembly |
| CN114156068B (en) * | 2021-12-09 | 2023-06-27 | 国网福建省电力有限公司 | Composite sound absorption and insulation plate for transformer |
-
1992
- 1992-02-06 JP JP4020877A patent/JP2768107B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05236598A (en) | 1993-09-10 |
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