JPH04128500U - Ultrasonic transducer - Google Patents
Ultrasonic transducerInfo
- Publication number
- JPH04128500U JPH04128500U JP3372191U JP3372191U JPH04128500U JP H04128500 U JPH04128500 U JP H04128500U JP 3372191 U JP3372191 U JP 3372191U JP 3372191 U JP3372191 U JP 3372191U JP H04128500 U JPH04128500 U JP H04128500U
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic transducer
- ultrasonic
- waves
- transmitting
- vibrator
- Prior art date
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- 239000000463 material Substances 0.000 claims abstract description 35
- 239000011148 porous material Substances 0.000 claims abstract description 14
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- 239000000919 ceramic Substances 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 22
- 230000035945 sensitivity Effects 0.000 abstract description 17
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- 229920006311 Urethane elastomer Polymers 0.000 description 1
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- 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
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Abstract
(57)【要約】
【目的】送信電力を大きくし、かつ受信感度を向上させ
る。
【構成】比較的大きな面積を有する送波用超音波振動子
１０の背面に比較的面積の小さな受波用超音波振動子２
６を設ける。電極面積比に応じ音圧が高まり受波感度が
向上する。また、振動子１０は有孔材料から、振動子２
６は非有孔材料から形成する。振動子１０により送信を
行う結果、送信電力を大きくとることができ、振動子２
６に非有孔材料を用いることにより受波感度が向上す
る。
(57) [Summary] [Purpose] Increase transmission power and improve reception sensitivity. [Configuration] Ultrasonic transducer 2 for receiving waves with a relatively small area on the back side of ultrasonic transducer 10 for transmitting waves having a relatively large area.
6 will be provided. The sound pressure increases according to the electrode area ratio, and the reception sensitivity improves. Further, the vibrator 10 is made of a perforated material, and the vibrator 2
6 is formed from a non-porous material. As a result of transmitting with the transducer 10, the transmission power can be increased, and the transducer 2
By using a non-porous material for 6, the wave reception sensitivity is improved.
Description
【０００１】0001
本考案は、魚群探知機等に利用され、水中で使用される超音波送受波器に関し 、特にその振動子構造の改良に関する。 This invention relates to ultrasonic transducers used underwater, such as in fish finders. , particularly regarding improvements in the vibrator structure.
【０００２】0002
従来から、超音波送受波器が魚群探知機等において用いられている。魚群探知 機は、水中に超音波を送波し、魚群等の反射体からの反射波を受波することによ り、魚群の大きさ、距離等を知る装置である。従って、魚群探知機等においては 超音波を送受波するための装置、すなわち超音波送受波器が必須である。 Conventionally, ultrasonic transducers have been used in fish finders and the like. Fish detection The device transmits ultrasonic waves into the water and receives reflected waves from reflective objects such as schools of fish. It is a device that can be used to determine the size and distance of schools of fish. Therefore, in fish finders etc. A device for transmitting and receiving ultrasonic waves, that is, an ultrasonic transducer is essential.
【０００３】 超音波送受波器は、通常、圧電材料から形成される超音波振動子を用いて構成 される。図３には、一従来例に係る超音波送受波器の構成が示されており、この 図に示される超音波送受波器は、ＰＺＴ等の圧電セラミクス材料から形成される 超音波振動子１０を備えている。0003 Ultrasonic transducers are typically constructed using an ultrasonic transducer made of piezoelectric material. be done. FIG. 3 shows the configuration of an ultrasonic transducer according to a conventional example. The ultrasonic transducer shown in the figure is formed from a piezoelectric ceramic material such as PZT. It is equipped with an ultrasonic transducer 10.
【０００４】 超音波振動子１０の表面には、銀等の電極１２及び１４が被覆形成されている 。電極１２及び１４には、それぞれ信号ケーブル１６及び１８が半田付け等によ り接続されている。振動子１０は、電極１２と１４の間に所定方向の電圧を印加 することにより分極処理が施されており、金属ケース２０内部に載置される。金 属ケース２０の内部には、遮音材２２が充填されている。遮音材２２は、コルク 、ポリウレタン樹脂等の材料であり、超音波振動子１０による放射効率を高める 機能を有している。超音波振動子１０は、遮音材２２と共に、例えば、ウレタン 樹脂で封止される。ウレタン樹脂の層２４はいわゆる整合層として機能する。こ こに、整合層とは、超音波振動子１０の音響インピーダンス（ＰＺＴから形成さ れる場合は３５×１０6 ｋｇ／ｍ2 ｓ）と、海水の音響インピーダンス１．５× １０6 ｋｇ／ｍ2 ｓとの音響的整合性をいわゆるλ／４整合の技術により確保す る層である。The surface of the ultrasonic transducer 10 is coated with electrodes 12 and 14 made of silver or the like. Signal cables 16 and 18 are connected to the electrodes 12 and 14, respectively, by soldering or the like. The vibrator 10 is polarized by applying a voltage in a predetermined direction between the electrodes 12 and 14, and is placed inside the metal case 20. The inside of the metal case 20 is filled with a sound insulating material 22. The sound insulating material 22 is made of a material such as cork or polyurethane resin, and has a function of increasing the radiation efficiency of the ultrasonic transducer 10. The ultrasonic transducer 10 is sealed together with a sound insulating material 22 using, for example, urethane resin. The urethane resin layer 24 functions as a so-called matching layer. Here, the matching layer has an acoustic impedance of the ultrasonic transducer 10 (35×10 6 kg/m 2 s when formed from PZT) and an acoustic impedance of 1.5× 10 6 kg/m 2 of seawater. This layer ensures acoustic matching with s by a so-called λ/4 matching technique.
【０００５】 従って、このような構成を有する従来の超音波送受波器において水中への送波 を行おうとする場合に、信号ケーブル１６と１８の間に電圧を供給し、この電圧 により超音波振動子１０を励振させる。すると、超音波振動子１０は図の上方向 に超音波を送波し、この超音波は水中の魚群等の反射体により反射される。反射 波は、整合層２４を介して再び超音波振動子１０により受信され、信号ケーブル １６及び１８からは受波に係る信号が出力される。送波に係る信号が例えばパル ス信号であった場合、送波時点と受波に係るパルスの到来時点と、の時間差から 魚群までの距離を知ることができ、受波に係るパルスの波高から魚群の規模を知 ることができる。[0005] Therefore, in a conventional ultrasonic transducer with such a configuration, it is difficult to transmit waves underwater. When a voltage is to be supplied between the signal cables 16 and 18, this voltage The ultrasonic transducer 10 is excited by this. Then, the ultrasonic transducer 10 moves upward in the figure. This ultrasonic wave is reflected by a reflector such as a school of fish in the water. reflection The waves are received by the ultrasonic transducer 10 again via the matching layer 24, and the signal cable Signals related to reception are output from 16 and 18. For example, if the signal related to transmission is a pulse If it is a pulse signal, it is determined from the time difference between the time of transmission and the time of arrival of the pulse related to reception. The distance to the school of fish can be determined, and the size of the school of fish can be determined from the wave height of the pulse related to the received wave. can be done.
【０００６】 このように、従来においては、超音波送受波器を利用して魚群探知機等を構成 することが可能であった。[0006] In this way, conventionally, fish finders etc. were configured using ultrasonic transducers. It was possible to do so.
【０００７】[0007]
魚群探知機等の装置に超音波送受波器を適用する場合、できるだけ遠方を見渡 すため、送信電力を大きくしかつ受信感度を上げる必要がある。しかし、送信電 力を大きくするためには、超音波振動子の形状を大きくする必要があり、この結 果、装置構成が大型化するという問題点が生ずる。また、受信感度を向上させる ためには、本願出願人が先に提案した空孔を有する圧電材料から形成される超音 波振動子を用いれば良い（特開平１−１７２２８１号）。この材料は、加わる力 １Ｎ当りに発生する電荷量を表すｇ定数が大きく、このため、空孔を有さない材 料から形成される振動子に比べ受信感度が高い。反面、空孔を有することにより 機械的強度が弱く、多大の送信電力を注入すると機械的な破壊等を生ずるため、 送信電力を大きくできないという問題点がある。 When applying an ultrasonic transducer to a device such as a fish finder, it is necessary to look as far away as possible. Therefore, it is necessary to increase the transmission power and the reception sensitivity. However, the transmission power In order to increase the force, it is necessary to increase the shape of the ultrasonic transducer, and this result As a result, a problem arises in that the device configuration becomes larger. It also improves reception sensitivity In order to achieve this, ultrasonic waves formed from a piezoelectric material with holes, which the applicant previously proposed A wave oscillator may be used (JP-A-1-172281). This material The g constant, which represents the amount of charge generated per 1N, is large, so it is a material that does not have pores. The receiving sensitivity is higher than that of vibrators made from materials. On the other hand, by having holes Mechanical strength is weak, and injecting a large amount of transmission power will cause mechanical damage, etc. There is a problem that the transmission power cannot be increased.
【０００８】 本考案は、このような問題点を解決することを課題としてなされたものであり 、送信電力を大きくすると共に受信感度を向上させることが可能な超音波送受波 器を提供することを目的とする。[0008] This invention was developed with the aim of solving these problems. , ultrasonic wave transmission and reception that can increase transmission power and improve reception sensitivity. The purpose is to provide equipment.
【０００９】[0009]
このような目的を達成するために、本考案は、圧電材料から形成され電圧の印 加により超音波を送波する送波用超音波振動子と、圧電材料から形成され、送波 用超音波振動子を介して反射体からの反射に係る超音波を受波するよう送波用超 音波振動子に対して超音波の送波方向とは逆側に配置され、送波用超音波振動子 より輻射面が小さな受波用超音波振動子と、を備えることを特徴とする。 In order to achieve such an objective, the present invention is made of a piezoelectric material and is capable of applying voltage. A transmitting ultrasonic vibrator that transmits ultrasonic waves by adding The ultrasonic wave transmitter receives the ultrasonic waves reflected from the reflector through the ultrasonic transducer. The ultrasonic transducer for wave transmission is placed on the opposite side of the ultrasound transducer from the ultrasonic wave transmission direction. The present invention is characterized by comprising a receiving ultrasonic transducer having a smaller radiation surface.
【００１０】 さらに、請求項２は、送波用超音波振動子が非有孔材料から、受波用超音波振 動子が有孔材料から、それぞれ形成されることを特徴とする。0010 Furthermore, claim 2 provides that the ultrasonic transducer for transmitting waves is made of a non-porous material, It is characterized in that the movers are each formed from a perforated material.
【００１１】 そして、請求項３は、送波用超音波振動子が圧電セラミクス材料から、受波用 超音波振動子が有機圧電材料又はゴムに圧電セラミクス粉体を混入した複合圧電 材料から、それぞれ形成されることを特徴とする。[0011] Claim 3 provides that the ultrasonic transducer for wave transmission is made of a piezoelectric ceramic material, The ultrasonic vibrator is a composite piezoelectric material in which piezoelectric ceramic powder is mixed with organic piezoelectric material or rubber. Each is characterized in that it is formed from a material.
【００１２】0012
本考案においては、送波及び受波がそれぞれ異なる超音波振動子により行われ る。すなわち、送波は、比較的大きな形状を有する送波用超音波振動子によって 行われ、受波は、この送波用超音波振動子の背面に設けられかつ輻射面がより小 さな受波用超音波振動子によって行われる。受波の際に送波用超音波振動子に加 わる力をＦ1 、音圧をＰ1 とし、受波用超音波振動子に加わる力をＦ2 、音圧を Ｐ2 、とするならば、受波用超音波振動子が送波用超音波振動子を介して超音波 を受波する結果、Ｆ1 ＝Ｆ2 であるため、受波用超音波振動子に加わる音圧Ｐ＝ （Ｓ1 ／Ｓ2 ）Ｐ1 となる。但し、Ｓ1 は送波用超音波振動子の送波面積、Ｓ2 は受波用超音波振動子の受波面積である。ここに、Ｓ1 ＞Ｓ2 であるため、音圧 Ｐ2 はＰ1 よりも大きい。従って、単一の振動子を用いて送波及び受波を行った 場合に比べ音圧が高く、従って受波感度が向上した超音波送受波器が得られる。 更に、請求項２においては、送波用超音波振動子を形成する材料として注入電 力を比較的大きくとることができる非有孔材料が用いられ、受波用超音波振動子 を形成する材料として比較的受信感度の良好な有孔材料が用いられる。従って、 請求項１において得られる作用に加え、さらに送信電力の向上及び受波感度の向 上という作用が得られる。In the present invention, wave transmission and wave reception are performed by different ultrasonic transducers. That is, wave transmission is performed by a transmitting ultrasonic transducer having a relatively large shape, and wave reception is performed by a receiving ultrasonic transducer that is provided on the back side of the transmitting ultrasonic transducer and has a smaller radiation surface. It is carried out by a sonic transducer. If the force applied to the transmitting ultrasonic transducer during reception is F 1 and the sound pressure is P 1 , the force applied to the receiving ultrasonic transducer is F 2 , and the sound pressure is P 2 . , as a result of the receiving ultrasonic transducer receiving ultrasonic waves via the transmitting ultrasonic transducer, F 1 =F 2 , so the sound pressure applied to the receiving ultrasonic transducer P = ( S 1 /S 2 ) P 1 . However, S 1 is the transmitting area of the ultrasonic transducer for transmitting waves, and S 2 is the receiving area of the ultrasonic transducer for receiving waves. Here, since S 1 >S 2 , the sound pressure P 2 is greater than P 1 . Therefore, an ultrasonic transducer with higher sound pressure and improved reception sensitivity than when transmitting and receiving waves using a single vibrator can be obtained. Furthermore, in claim 2, a non-porous material is used as the material for forming the ultrasonic transducer for transmitting waves, and a non-porous material is used as the material for forming the ultrasonic transducer for receiving waves, which allows a relatively large amount of power to be injected. A porous material with relatively good reception sensitivity is used. Therefore, in addition to the effects obtained in claim 1, the effects of improving transmission power and receiving sensitivity can be obtained.
【００１３】 そして、請求項３においては、請求項２と同様の作用が得られる。すなわち、 請求項３において受波用超音波振動子を形成する材料として有機圧電材料又は複 合圧電材料が用いられる。これらは、前述の有孔材料と同様、受波感度を高める 作用を奏する。[0013] In claim 3, the same effect as in claim 2 can be obtained. That is, In claim 3, an organic piezoelectric material or a composite material is used as the material forming the receiving ultrasonic transducer. A composite piezoelectric material is used. These, like the porous materials mentioned above, increase reception sensitivity. play an action.
【００１４】[0014]
以下、本考案の好適な実施例について図面に基づき説明する。なお、図３に示 される従来例と同様の構成には同一の符号を付し、説明を省略する。 Hereinafter, preferred embodiments of the present invention will be described based on the drawings. In addition, as shown in Figure 3. Components similar to those of the conventional example are given the same reference numerals, and explanations thereof will be omitted.
【００１５】 図１には、本考案の一実施例に係る超音波送受波器における振動子構造が、図 ２にはその組立状況が、それぞれ示されている。図１に示されるように、本実施 例においては、空孔を含まないＰＺＴ材料から形成された超音波振動子１０の他 、空孔を含むＰＺＴ材料から形成された超音波振動子２６が用いられている。空 孔を含まない振動子１０は例えば５０ｍφから形成されており、空孔を含む振動 子２６は例えば５〜１０ｍφの振動子である。振動子２６の上下両面にはそれぞ れ銀等の電極２８及び３０が形成されており、電極２８は、導電性を有するエポ キシ樹脂３２によって振動子１０の電極１４に接着されている。超音波振動子２ ６は、例えばＰＺＴ粉末にメタクリル樹脂を１０〜４０％（体積比）で混合し、 加圧成形、焼成、銀による電極２８及び３０の形成等の工程を経て、製造される 振動子である。この振動子においては、焼成の際にメタクリル樹脂が焼失しメタ クリル樹脂が存在していた部分について空孔が形成される。この結果、空孔を含 まない材料が形成される振動子１０に比べ、ｇ定数が大きい振動子が得られる。[0015] FIG. 1 shows a transducer structure in an ultrasonic transducer according to an embodiment of the present invention. 2 shows the assembly status. As shown in Figure 1, this implementation In the example, in addition to the ultrasonic transducer 10 formed from a PZT material that does not contain pores, , an ultrasonic transducer 26 made of a PZT material containing holes is used. Sky The vibrator 10 that does not include a hole is formed with a diameter of 50 m, for example, and the vibrator 10 that does not include a hole is The element 26 is, for example, a 5 to 10 mφ vibrator. On both the upper and lower sides of the vibrator 26, Electrodes 28 and 30 are formed of silver or the like, and the electrode 28 is made of conductive epoxy resin. It is bonded to the electrode 14 of the vibrator 10 with a resin 32 . Ultrasonic transducer 2 6, for example, mixes 10 to 40% (volume ratio) of methacrylic resin to PZT powder, Manufactured through processes such as pressure molding, firing, and forming the electrodes 28 and 30 with silver. It is a vibrator. In this resonator, the methacrylic resin is burned away during firing and the methacrylic resin is burned out during firing. Voids are formed in the areas where the acrylic resin was present. As a result, the A vibrator with a larger g constant can be obtained than the vibrator 10 which is formed of a material that does not contain the same material.
【００１６】 このように、２個の振動子１０及び１６から構成される振動子構造は、図３に 示される従来例と同様に金属ケース２０内に封入される。この場合、エポキシ樹 脂３２によって電極１４と２８とが電気的に接続されているため、信号ケーブル １８は、両電極１４及び１８についてのケーブルとして機能する。また、この実 施例においては、電極３０に係る信号ケーブル３４が設けられている。[0016] In this way, the oscillator structure composed of the two oscillators 10 and 16 is shown in FIG. It is enclosed in a metal case 20 similarly to the conventional example shown. In this case, the epoxy tree Since the electrodes 14 and 28 are electrically connected by the grease 32, the signal cable 18 serves as a cable for both electrodes 14 and 18. Also, this fruit In the embodiment, a signal cable 34 associated with the electrode 30 is provided.
【００１７】 この実施例に係る超音波送受波器を用いて水中に超音波を送波しようとする場 合、信号ケーブル１６と１８の間に送信機から所定の電圧を印加する。この電圧 、すなわち送信信号は、振動子１０において超音波に変換され、ウレタン樹脂か ら形成される整合層２４を介して水中に送波される。この場合、振動子１０を形 成する材料として非有孔（すなわち緻密な）ＰＺＴを用いているため、比較的送 信電力を大きく保つことができる。[0017] When attempting to transmit ultrasonic waves underwater using the ultrasonic transducer according to this embodiment, In this case, a predetermined voltage is applied between the signal cables 16 and 18 from the transmitter. this voltage That is, the transmitted signal is converted into an ultrasonic wave in the vibrator 10, and the urethane resin The waves are transmitted into the water via the matching layer 24 formed from the above. In this case, the resonator 10 is Since non-porous (that is, dense) PZT is used as the material for the It is possible to maintain a large amount of power.
【００１８】 また、このようにして送信された超音波が魚群等により反射されて受波される 場合、受波に係る超音波は整合層２４及び振動子１０を介して振動子２６により 受波される。振動子２６は、空孔を有する材料から形成されているため受信感度 が高く、さらに振動子１０よりも電極面積が小さいため、面積比に応じ高められ た音圧で受波を行うこととなる。従って、信号ケーブル１８と３４の間に現れる 電圧は、振動子１０のみで受波を行った場合に比べ高い電圧となる。すなわち感 応電圧が高く、良好な受信動作が実現されることとなる。[0018] In addition, the ultrasonic waves transmitted in this way are reflected by schools of fish and received. In this case, the received ultrasonic wave is transmitted by the vibrator 26 via the matching layer 24 and the vibrator 10. waves are received. Since the vibrator 26 is made of a material with holes, the receiving sensitivity is low. is high, and the electrode area is smaller than that of the vibrator 10, so it can be increased according to the area ratio. Waves are received at the same sound pressure. Therefore, appearing between signal cables 18 and 34 The voltage is higher than when the wave is received only by the vibrator 10. In other words, the feeling The response voltage is high, and good reception operation is realized.
【００１９】 さらには、この実施例においては、送信動作が全て振動子１０において行われ ているため、送信電力の注入に伴う機械的な歪みが専ら振動子１０において生ず る。従って、この機械的歪みによる振動子１０または２６の破壊は生じ難い。[0019] Furthermore, in this embodiment, all transmission operations are performed in the vibrator 10. Therefore, mechanical distortion caused by the injection of transmission power occurs exclusively in the vibrator 10. Ru. Therefore, destruction of the vibrator 10 or 26 due to this mechanical distortion is unlikely to occur.
【００２０】 このように、本実施例によれば、機械的な破壊を生ずることなく送信電力を大 きくすることができると共に、受信に係る感度を向上させることができる。[0020] In this way, according to this embodiment, the transmission power can be increased without causing mechanical damage. It is possible to improve the reception sensitivity.
【００２１】 なお、以上の説明においては、振動子１０及び２６を形成する材料としてＰＺ Ｔを仮定したが、これは他の種類の圧電セラミクス材料であっても良い。すなわ ち、Ｐｂ（Ｚｒ，Ｔｉ）Ｏ3 ：ジルコン酸チタン酸鉛（ＰＺＴ）の他、ＢａＴｉ Ｏ3 ：チタン酸バリウム、ＰｂＴｉＯ3 ：チタン酸鉛を用いても良い。さらに、 空孔を形成する手段はＰＭＭＡの混合以外であっても良い。In the above description, PZT is assumed as the material for forming the vibrators 10 and 26, but other types of piezoelectric ceramic materials may be used. That is, in addition to Pb(Zr,Ti)O 3 :lead zirconate titanate (PZT), BaTiO 3 :barium titanate and PbTiO 3 :lead titanate may be used. Furthermore, the means for forming pores may be other than mixing PMMA.
【００２２】 さらに進んで、振動子２６を空孔を有する圧電セラミクス以外から形成するよ うにしても良い。例えば、空孔を有していないＰｂ（Ｚｒ，Ｔｉ）Ｏ3 、ＢａＴ ｉＯ3 又はＰｂ（Ｚｒ，Ｔｉ）Ｏ3 から形成するようにしても、面積比に起因す る感度向上は実現される。あるいは、有機圧電材料又は複合圧電材料を用いても 良く、この場合、材質に起因する感度向上も実現される。有機圧電材料としては 、例えば、ＰＶＤＦ：ポリ弗化ビニリデン、ＰＶＤＦ共重合体、Ｐ（ＶＤＦ／Ｔ ｒＦＥ）：弗化ビニリデンと３弗化エチレンの共重合体、Ｐ（ＶＤＣＮ／ＶＡｃ ）：シアン化ビニリデンと酢酸ビニルの共重合体等をあげることができ、複合圧 電材料としては、ＮＢＲ：ブタジエンとアクリロニトリルの共重合体、ＳＢＲ： ブタジエンとスチレンのラジカル共重合体もしくはウレタンゴムに圧電セラミク ス粉体を混入した材料をあげることができる。[0022]Going further, the vibrator 26 may be formed of a material other than piezoelectric ceramics having holes. For example, even if it is formed from Pb(Zr,Ti)O 3 , BaTiO 3 or Pb(Zr,Ti)O 3 which does not have pores, the sensitivity improvement due to the area ratio can be achieved. Alternatively, an organic piezoelectric material or a composite piezoelectric material may be used, and in this case, sensitivity improvement due to the material is also realized. Examples of organic piezoelectric materials include PVDF: polyvinylidene fluoride, PVDF copolymer, P(VDF/TrFE): copolymer of vinylidene fluoride and ethylene trifluoride, P(VDCN/VAc): cyanide. Examples of composite piezoelectric materials include copolymers of vinylidene and vinyl acetate, NBR: copolymers of butadiene and acrylonitrile, SBR: radical copolymers of butadiene and styrene, or piezoelectric ceramic powders in urethane rubber. You can list the mixed ingredients.
【００２３】[0023]
以上説明したように、本考案によれば、比較的面積の大きい送信用超音波振動 子と比較的面積の小さい受波用超音波送受波器を用い、送波用超音波振動子を介 して受波用超音波振動子により受波を行うようにしたため、送信電力を大きくし 受波感度を向上させることが可能となる。 As explained above, according to the present invention, ultrasonic vibration for transmission with a relatively large area can be achieved. Using an ultrasonic transducer for reception with a relatively small surface area and an ultrasonic transducer for transmission, Since the wave is received by an ultrasonic transducer for wave reception, the transmission power is increased. It becomes possible to improve wave reception sensitivity.
【００２４】 さらに、請求項２によれば、送波用超音波振動子を非有孔材料から、受波用超 音波振動子を有孔材料から、それぞれ形成するようにしたため、受波感度を高め ることが可能となる。[0024] Furthermore, according to claim 2, the transmitting ultrasonic transducer is made of a non-porous material. The sound wave oscillators are each formed from a perforated material, increasing reception sensitivity. It becomes possible to
【００２５】 そして、請求項３によれば、請求項２と同様の効果を得ることができ、加えて 、受波用超音波振動子の製造の際の加工が簡単となる。[0025] According to claim 3, the same effects as claim 2 can be obtained, and in addition, This simplifies processing when manufacturing an ultrasonic transducer for receiving waves.
【図１】本考案の一実施例に係る超音波送受波器におけ
る振動子構造を示す側面図である。FIG. 1 is a side view showing a vibrator structure in an ultrasonic transducer according to an embodiment of the present invention.
【図２】この実施例の組立状況を示す断面図である。FIG. 2 is a sectional view showing the assembly state of this embodiment.
【図３】一従来例に係る超音波送受波器の構成を示す断
面図である。FIG. 3 is a cross-sectional view showing the configuration of an ultrasonic transducer according to a conventional example.
１０，２６ 振動子 １２，１４，２８，３０ 電極 10,26 vibrator 12, 14, 28, 30 electrodes
───────────────────────────────────────────────────── フロントページの続き (72)考案者 熊本 進 東京都三鷹市下連雀五丁目１番１号 日本 無線株式会社内 ──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Susumu Kumamoto 5-1-1 Shimorenjaku, Mitaka City, Tokyo Japan Within Musen Co., Ltd.
Claims (3)
音波を送波する送波用超音波振動子と、圧電材料から形
成され、送波用超音波振動子を介して反射体からの反射
に係る超音波を受波するよう送波用超音波振動子に対し
て超音波の送波方向とは逆側に配置され、送波用超音波
振動子より輻射面が小さな受波用超音波振動子と、を備
えることを特徴とする超音波送受波器。1. A transmitting ultrasonic transducer made of a piezoelectric material and transmitting ultrasonic waves by applying a voltage; and a transmitting ultrasonic transducer made of a piezoelectric material that transmits ultrasonic waves through the transmitting ultrasonic transducer. The ultrasonic transducer for receiving ultrasonic waves is placed on the opposite side of the ultrasonic transducer to the transmitting direction of the ultrasonic waves, and has a smaller radiation surface than the ultrasonic transducer for transmitting ultrasonic waves. An ultrasonic transducer characterized by comprising a vibrator.
送波用超音波振動子が非有孔材料から、受波用超音波振
動子が有孔材料から、それぞれ形成されることを特徴と
する超音波送受波器。2. The ultrasonic transducer according to claim 1, comprising:
An ultrasonic transducer characterized in that a transmitting ultrasonic transducer is formed from a non-porous material and a receiving ultrasonic transducer is formed from a porous material.
送波用超音波振動子が圧電セラミクス材料から、受波用
超音波振動子が有機圧電材料又はゴムに圧電セラミクス
粉体を混入した複合圧電材料から、それぞれ形成される
ことを特徴とする超音波送受波器。3. The ultrasonic transducer according to claim 1, comprising:
Ultrasonic waves characterized in that the ultrasonic transducer for transmitting waves is formed from a piezoelectric ceramic material, and the ultrasonic transducer for receiving waves is formed from an organic piezoelectric material or a composite piezoelectric material in which piezoelectric ceramic powder is mixed with rubber. Transducer/receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3372191U JPH04128500U (en) | 1991-05-14 | 1991-05-14 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3372191U JPH04128500U (en) | 1991-05-14 | 1991-05-14 | Ultrasonic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04128500U true JPH04128500U (en) | 1992-11-24 |
Family
ID=31916299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3372191U Pending JPH04128500U (en) | 1991-05-14 | 1991-05-14 | Ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04128500U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5489721A (en) * | 1977-12-27 | 1979-07-17 | Nec Corp | Compound type transmitter-receiver |
| JPH01172281A (en) * | 1987-12-25 | 1989-07-07 | Japan Radio Co Ltd | Dielectric material for piezoelectric vibrator |
-
1991
- 1991-05-14 JP JP3372191U patent/JPH04128500U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5489721A (en) * | 1977-12-27 | 1979-07-17 | Nec Corp | Compound type transmitter-receiver |
| JPH01172281A (en) * | 1987-12-25 | 1989-07-07 | Japan Radio Co Ltd | Dielectric material for piezoelectric vibrator |
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