JP3528491B2 - Ultrasonic transducer - Google Patents
Ultrasonic transducerInfo
- Publication number
- JP3528491B2 JP3528491B2 JP01210697A JP1210697A JP3528491B2 JP 3528491 B2 JP3528491 B2 JP 3528491B2 JP 01210697 A JP01210697 A JP 01210697A JP 1210697 A JP1210697 A JP 1210697A JP 3528491 B2 JP3528491 B2 JP 3528491B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- ultrasonic
- transmitting
- case
- receiving
- 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
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- 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】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、超音波信号を送信
するとともに障害物からの反射波を受信して障害物の存
在を検出する超音波センサの、超音波送受波器に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic wave transmitter / receiver of an ultrasonic sensor which transmits an ultrasonic wave signal and receives a reflected wave from an obstacle to detect the presence of the obstacle.
【０００２】[0002]
【従来の技術】図５は超音波センサを示す原理説明図、
図６は従来の超音波送受波器を示す断面図、図７は従来
の超音波送受波器の超音波振動子を示す断面図である。
図８は従来の超音波送受波器の送受波信号の説明図であ
り、図８（ａ）は送波信号の説明図、図８（ｂ）は受波
信号の説明図である。図９は従来の他の超音波送受波器
を示す断面図である。2. Description of the Related Art FIG. 5 is an explanatory view of the principle of an ultrasonic sensor,
FIG. 6 is a sectional view showing a conventional ultrasonic transmitter / receiver, and FIG. 7 is a sectional view showing an ultrasonic transducer of the conventional ultrasonic transmitter / receiver.
8A and 8B are explanatory diagrams of a transmission / reception signal of a conventional ultrasonic transmitter / receiver, FIG. 8A is an explanatory diagram of a transmission signal, and FIG. 8B is an explanatory diagram of a reception signal. FIG. 9 is a sectional view showing another conventional ultrasonic transducer.
【０００３】図５に示すように、超音波センサの原理
は、前方に障害物Ａが存在する場合、超音波送受波器１
から前方空間に送波した超音波信号Ｂが障害物Ａにて反
射し、再び戻ってくるまでの所要時間に基づいて障害物
Ａまでの距離Ｌを検出するようにされている。As shown in FIG. 5, the principle of the ultrasonic sensor is that the ultrasonic transducer 1 is used when an obstacle A exists in front of the ultrasonic sensor 1.
The distance L to the obstacle A is detected based on the time required for the ultrasonic signal B transmitted from the to the front space to be reflected by the obstacle A and returned again.
【０００４】ところで、従来の超音波センサにあって
は、図６に示すような超音波送受波器１が用いられてい
る。すなわち、超音波送受波器１は、樹脂製の成形品で
作られたハウジング２と、ハウジング２内に収納する超
音波振動子３と回路ブロック４とを備える。ハウジング
２は、前方へ効率よくビーム状に超音波を送波するため
のホーン部２ａを備える。超音波振動子３は、電気信号
を機械的振動に変換して空気を直接振動したり、空気の
振動を機械的振動に変換したうえで電気信号にしたりす
る部分であり、超音波の入出力する部分が開口するシリ
コンゴムなどの保持材５を介在してハウジング２内に収
納する。回路ブロック４は、シールド線Ｗを介して電気
信号を超音波振動子３へ供給したり、超音波振動子３か
ら入力される電気信号を増幅したりする。By the way, in a conventional ultrasonic sensor, an ultrasonic wave transmitter / receiver 1 as shown in FIG. 6 is used. That is, the ultrasonic wave transmitter / receiver 1 includes a housing 2 made of a resin molded product, an ultrasonic vibrator 3 and a circuit block 4 housed in the housing 2. The housing 2 is provided with a horn portion 2a for efficiently transmitting ultrasonic waves in a beam shape to the front. The ultrasonic transducer 3 is a portion that converts an electric signal into mechanical vibration to directly vibrate air, or converts the vibration of air into mechanical vibration and then converts the electric signal into an electric signal. It is housed in the housing 2 with a holding material 5 such as a silicon rubber having an open portion interposed therebetween. The circuit block 4 supplies an electric signal to the ultrasonic transducer 3 via the shield wire W, and amplifies the electric signal input from the ultrasonic transducer 3.
【０００５】超音波振動子３は、詳しくは図７に示すよ
うに、筒状体の一端を薄板部３ａ1にて閉塞したアルミ
ニウム製のケース３ａと、ケース３ａの薄板部３ａ1 の
内面に貼着する小さな板状の圧電素子３ｂと、ケース３
ａの開口側を施蓋する回路基板３ｃとから構成される。
回路基板３ｃにはシールド線Ｗが接続され、回路基板３
ｃからは活線側のリード線３ｄ1 とアース側のリード線
３ｄ2 とが引き出され、リード線３ｄ1 は圧電素子３ｂ
に接続し、リード線３ｄ2 は圧電素子３ｂの近傍の薄板
部３ａ1 に接続する。[0005] Ultrasonic transducers 3, details as shown in Figure 7, one end of the tubular body and the aluminum case 3a which is closed by the thin plate portion 3a 1, the inner surface of the thin plate portion 3a 1 of the case 3a A small plate-shaped piezoelectric element 3b to be attached and a case 3
The circuit board 3c covers the opening side of a.
The shielded wire W is connected to the circuit board 3c.
A lead wire 3d 1 on the live side and a lead wire 3d 2 on the ground side are drawn out from c, and the lead wire 3d 1 is connected to the piezoelectric element 3b.
The lead wire 3d 2 is connected to the thin plate portion 3a 1 near the piezoelectric element 3b.
【０００６】上述のように構成される従来の超音波送受
波器１は、図８に示すような超音波信号の送受波特性を
備える。すなわち、図８（ａ）に示すような駆動信号を
圧電素子３ｂに印加して薄板部３ａ1 を振動させて超音
波を送波すると、図８（ｂ）に示すように残響振動によ
る残響信号が駆動信号の後にあらわれ、圧電素子３ｂの
駆動開始からＴ＝２Ｌ／Ｖ秒後に障害物Ａからの反射波
が返ってくる。但し、Ｖは音速である。The conventional ultrasonic wave transmitter / receiver 1 configured as described above has an ultrasonic wave signal transmitting / receiving characteristic as shown in FIG. That is, when a driving signal as shown in FIG. 8A is applied to the piezoelectric element 3b to vibrate the thin plate portion 3a 1 and ultrasonic waves are transmitted, a reverberation signal due to reverberation vibration is generated as shown in FIG. 8B. Appears after the drive signal, and the reflected wave from the obstacle A returns after T = 2 L / V seconds from the start of driving the piezoelectric element 3b. However, V is the speed of sound.
【０００７】[0007]
【発明が解決しようとする課題】従って、図５の超音波
送受波器１と障害物Ａとの距離が短くなればなるほど、
図８（ｂ）の障害物Ａからの反射波は益々残響信号に近
づき、反射波はついにはその残響信号の中に隠れてしま
う。そのために、図６に示すような構成の従来の超音波
送受波器１を備える超音波センサにあっては、障害物Ａ
と超音波送受波器１との距離があまり接近すると障害物
Ａを検出できないことになる。Therefore, the shorter the distance between the ultrasonic transducer 1 and the obstacle A in FIG.
The reflected wave from the obstacle A shown in FIG. 8B approaches the reverberation signal more and more, and the reflected wave is finally hidden in the reverberation signal. Therefore, in the ultrasonic sensor provided with the conventional ultrasonic transmitter / receiver 1 having the structure shown in FIG.
If the distance between the ultrasonic wave transmitter and the ultrasonic wave transmitter 1 is too short, the obstacle A cannot be detected.
【０００８】そこで、超音波振動子３の残響振動による
近距離検出能力の低下を防止するために、残響振動の生
じない送受別体型の超音波振動子を用いる超音波送受波
器が考案されており、その超音波送受波器の構造を図９
に示す。図９に示す超音波送受波器６は、樹脂製の成形
品で作られたハウジング７と、ハウジング７内に収納す
る送波用の超音波振動子８ａと受波用の超音波振動子８
ｂと回路ブロック９とを備える。Therefore, in order to prevent the deterioration of the short-distance detection capability due to the reverberation vibration of the ultrasonic transducer 3, an ultrasonic transducer using a transceiving-type ultrasonic transducer without reverberation was devised. Fig. 9 shows the structure of the ultrasonic transducer.
Shown in. The ultrasonic wave transmitter / receiver 6 shown in FIG. 9 includes a housing 7 made of a resin molded product, an ultrasonic vibrator 8a for transmitting waves and an ultrasonic vibrator 8 for receiving waves, which are housed in the housing 7.
b and the circuit block 9.
【０００９】ハウジング７は、前方へ効率よくビーム状
に超音波を送波するためのホーン部７ａと、前方から効
率よく超音波を受波するためのホーン部７ｂとを備え
る。超音波振動子８ａは電気信号を機械的振動に変換し
て空気を直接振動するものであり、超音波振動子８ｂは
空気の振動を機械的振動に変換したうえで電気信号にす
るものである。超音波振動子８ａ，８ｂのそれぞれは、
図７に示した超音波振動子と同様に構成されおり、超音
波の入出力する部分が開口するシリコンゴムなどの保持
材１０を介在してハウジング７内に収納する。回路ブロ
ック９は、シールド線Ｗを介して電気信号を超音波振動
子８ａへ供給したり、超音波振動子８ｂから入力される
電気信号を増幅したりする。The housing 7 is provided with a horn portion 7a for efficiently transmitting ultrasonic waves in a beam shape to the front and a horn portion 7b for efficiently receiving ultrasonic waves from the front. The ultrasonic vibrator 8a converts an electric signal into a mechanical vibration to directly vibrate the air, and the ultrasonic vibrator 8b converts a vibration of the air into a mechanical vibration and then converts the electric signal into an electric signal. . Each of the ultrasonic transducers 8a and 8b is
The ultrasonic vibrator shown in FIG. 7 has the same structure as that of the ultrasonic vibrator, and is housed in the housing 7 with a holding material 10 such as silicon rubber having an opening for input and output of ultrasonic waves interposed. The circuit block 9 supplies an electric signal to the ultrasonic transducer 8a via the shield wire W, or amplifies the electric signal input from the ultrasonic transducer 8b.
【００１０】しかしながら、図９に示すような超音波送
受波器６にあっては、図６に示すような送受兼用構成の
超音波振動子３を用いた超音波送受波器１と比較して、
超音波振動子８ａと超音波振動子８ｂとが別体であるぶ
ん残響振動による影響が軽減されるため近距離検出能力
は向上するものの、超音波振動子、保持材およびホーン
部をそれぞれ２つずつ設ける必要があり、組み立て難く
コストが嵩むだけでなく形状も大きくなってしまうとい
う問題点があった。However, in the ultrasonic wave transmitter / receiver 6 as shown in FIG. 9, as compared with the ultrasonic wave transmitter / receiver 1 using the ultrasonic transducer 3 having the structure for transmitting / receiving as shown in FIG. ,
Although the ultrasonic transducer 8a and the ultrasonic vibrator 8b is short range detection capability for the influence of the sentence reverberation oscillation are separate can be reduced is improved, two ultrasonic transducers, the holding member and the horn portion, respectively must be provided One does not only difficult assembly costly shape disadvantageously becomes large.
【００１１】本発明は上記の問題点を解決するために成
されたもので、その目的とするところは、小型化可能で
且つ廉価にして近距離検出能力の向上した、優れる超音
波送受波器を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide an excellent ultrasonic transmitter / receiver which can be downsized, is inexpensive, and has improved short-distance detection capability. To provide.
【００１２】[0012]
【課題を解決するための手段】本発明は上記の問題点を
解決するため、請求項１記載の発明にあっては、送波用
圧電素子を備え筒状体の一端を送波用振動板にて閉塞し
た送波用ケース部と、受波用圧電素子を備え筒状体の一
端を受波用振動板にて閉塞した受波用ケース部と、送波
用ケース部と受波用ケース部とを並列に連結する連結片
部とを有する超音波振動子を、ハウジング内に収納した
超音波送受波器であって、前記連結片部により、送波用
ケース部の開口部近傍と受波用ケース部の開口部近傍と
でのみ、送波用ケース部と受波用ケース部とを連結する
ようにしたことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vibration plate for wave transmission, wherein one end of a cylindrical body is provided with a piezoelectric element for wave transmission. And a wave-receiving case, in which one end of a cylindrical body having a wave-receiving piezoelectric element is closed by a wave-receiving diaphragm, and a wave-transmitting case and a wave-receiving case An ultrasonic transducer having an ultrasonic transducer having a connecting piece part for connecting the parts in parallel with each other, the ultrasonic wave transmitter / receiver being housed in a housing, wherein the connecting piece part receives the vicinity of the opening of the transmitting case part. The wave transmission case and the wave reception case are connected only in the vicinity of the opening of the wave case.
【００１３】また、請求項２記載の発明にあっては、前
記連結片部により連結した送波用ケース部と受波用ケー
ス部との隙間に緩衝材を介在したことを特徴とする。Further, the invention according to claim 2 is characterized in that a cushioning material is interposed in a gap between the wave transmitting case portion and the wave receiving case portion connected by the connecting piece portion.
【００１４】[0014]
【発明の実施の形態】以下、本発明に係る超音波送受波
器の一実施の形態を図１〜図３に基づいて、他の実施の
形態を図４に基づいて、それぞれ詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an ultrasonic wave transmitter / receiver according to the present invention will be described below in detail with reference to FIGS. 1 to 3, and another embodiment with reference to FIG. .
【００１５】図１は超音波送受波器を示す断面図であ
る。図２は超音波振動子を示す図であり、図２（ａ）は
平面図、図２（ｂ）は断面図である。図３は振動モード
を説明する側面図である。図４は他の実施の形態の超音
波送受波器の超音波振動子を示す図であり、図４（ａ）
は平面図、図４（ｂ）は断面図である。FIG. 1 is a sectional view showing an ultrasonic wave transmitter / receiver. 2A and 2B are views showing an ultrasonic transducer, in which FIG. 2A is a plan view and FIG. 2B is a sectional view. FIG. 3 is a side view illustrating the vibration mode. FIG. 4 is a diagram showing an ultrasonic transducer of an ultrasonic transducer according to another embodiment, and FIG.
Is a plan view and FIG. 4B is a sectional view.
【００１６】超音波送受波器２０は、樹脂製の成形品で
作られたハウジング２１と、ハウジング２１内に収納す
る超音波振動子２２と回路ブロック２３とを備える。ハ
ウジング２１は、前方へ効率よくビーム状に超音波を送
波するためのホーン部２１ａを備える。超音波振動子２
２は、電気信号を機械的振動に変換して空気を直接振動
したり、空気の振動を機械的振動に変換したうえで電気
信号に変換したりする部分であり、超音波の入出力する
部分が開口するシリコンゴムなどの保持材２４を介在し
てハウジング２１内に収納する。回路ブロック２３は、
シールド線Ｗ1を介して電気信号を超音波振動子２２へ
供給したり、シールド線Ｗ2 を介して超音波振動子２２
から入力される電気信号を増幅したりする。The ultrasonic wave transmitter / receiver 20 includes a housing 21 made of a resin molded product, an ultrasonic vibrator 22 and a circuit block 23 housed in the housing 21. The housing 21 includes a horn portion 21a for efficiently transmitting ultrasonic waves in a beam shape to the front. Ultrasonic transducer 2
Reference numeral 2 denotes a portion for converting an electric signal into mechanical vibration to directly vibrate air, or a portion for converting air vibration into mechanical vibration and then converting into an electric signal, and a portion for inputting and outputting ultrasonic waves. It is housed in the housing 21 with a holding material 24 such as silicon rubber having an opening. The circuit block 23 is
An electric signal is supplied to the ultrasonic transducer 22 via the shielded wire W 1, and the ultrasonic transducer 22 is supplied via the shielded wire W 2.
Amplifies the electrical signal input from.
【００１７】超音波振動子２２は、詳しくは図２に示す
ように、筒状体の一端を送波用振動板２２ａ1 にて閉塞
したアルミニウム製の送波用ケース部２２ａと、筒状体
の一端を受波用振動板２２ｂ1 にて閉塞したアルミニウ
ム製の受波用ケース部２２ｂと、送波用ケース部２２ａ
と受波用ケース部２２ｂとを連結する連結片部２２ｃ
と、送波用ケース部２２ａの送波用振動板２２ａ1 の内
面に貼着する小さな板状の送波用圧電素子２２ｄと、受
波用ケース部２２ｂの受波用振動板２２ｂ1 の内面に貼
着する小さな板状の受波用圧電素子２２ｅと、送波用ケ
ース部２２ａの開口部を施蓋する回路基板２２ｆと、受
波用ケース部２２ｂの開口部を施蓋する回路基板２２ｇ
とから構成される。The ultrasonic transducer 22, specifically as shown in FIG. 2, the aluminum transmitting a case portion 22a which closes the one end of the tubular body at transmitting diaphragm 22a 1, the tubular body and aluminum reception for case portion 22b which is closed at reception diaphragm 22b 1 at one end of, transmitting a case section 22a
A connecting piece 22c for connecting the receiving case 22b with the wave receiving case 22b
And a small plate-shaped piezoelectric element 22d for transmitting which is attached to the inner surface of the wave-transmitting diaphragm 22a 1 of the wave-transmitting case 22a, and the inner surface of the wave-receiving diaphragm 22b 1 of the wave-receiving case 22b. A small plate-shaped piezoelectric element 22e for wave reception, which is attached to the circuit board 22f, which covers the opening of the case 22a for wave transmission, and a circuit board 22g which covers the opening of the case 22b for wave reception.
Composed of and.
【００１８】回路基板２２ｆにはシールド線Ｗ1 が接続
され、回路基板２２ｇにはシールド線Ｗ2 が接続され
る。回路基板２２ｆからは活線側のリード線２２ｈ1 と
アース側のリード線２２ｈ2 とが引き出され、リード線
２２ｈ1 は送波用圧電素子２２ｄに接続し、リード線２
２ｈ2 は送波用圧電素子２２ｄの近傍の送波用振動板２
２ａ1 に接続する。また、回路基板２２ｇからは活線側
のリード線２２ｉ1 とアース側のリード線２２ｉ2 とが
引き出され、リード線２２ｉ1 は受波用圧電素子２２ｅ
に接続し、リード線２２ｉ2 は受波用圧電素子２２ｅの
近傍の受波用振動板２２ｂ1 に接続する。[0018] The circuit board 22f is connected to the shield wire W 1, the circuit board 22g is connected shielded wire W 2. A lead wire 22h 1 on the live line side and a lead wire 22h 2 on the ground side are drawn out from the circuit board 22f, and the lead wire 22h 1 is connected to the wave-transmitting piezoelectric element 22d.
2h 2 is a wave transmission diaphragm 2 near the wave transmission piezoelectric element 22d
Connect to 2a 1 . A lead wire 22i 1 on the live line side and a lead wire 22i 2 on the ground side are drawn out from the circuit board 22g, and the lead wire 22i 1 is the piezoelectric element 22e for receiving waves.
The lead wire 22i 2 is connected to the wave receiving diaphragm 22b 1 near the wave receiving piezoelectric element 22e.
【００１９】ところで、この超音波振動子２２が特徴と
なるのは次の構成である。すなわち、送波用振動板２２
ａ1 から超音波を送波するには、使用する周波数の超音
波で送波用ケース部２２ａを振動させなければならず、
送波用ケース部２２ａの共振周波数近傍で送波用圧電素
子２２ｄを振動する必要がある。また、反射して返って
くる超音波を受波用振動板２２ｂ1 にて受波するには、
使用する周波数の超音波で受波用ケース部２２ｂを振動
させなければならならない。By the way, the ultrasonic transducer 22 is characterized by the following structure. That is, the wave transmission diaphragm 22
In order to transmit the ultrasonic wave from a 1, it is necessary to vibrate the transmitting case portion 22a with the ultrasonic wave of the frequency used,
It is necessary to vibrate the transmitting piezoelectric elements 22d in the vicinity of the resonance frequency of the transmitting case for section 22a. Further, in order to receive the reflected and returned ultrasonic waves with the receiving diaphragm 22b 1 ,
It is necessary to vibrate the receiving case portion 22b with ultrasonic waves of the frequency used.
【００２０】そこで、使用する超音波の周波数に基づい
て送波用ケース部２２ａと受波用ケース部２２ｂとを設
計することになるが、送波用ケース部２２ａと受波用ケ
ース部２２ｂとのそれぞれは、使用する周波数の超音波
で、図３に示すように、開口部がちょうど節（振幅が最
小）になるモードで共振する。従って、連結片部２２ｃ
を以て、送波用ケース部２２ａの開口部近傍と受波用ケ
ース部２２ｂの開口部近傍とを連結すると、使用する周
波数の超音波で共振するときに節（振幅が最小）になる
部分で連結することになり、送波用振動板２２ａ1 から
超音波を送波するときの送波用ケース部２２ａの振動は
連結片部２２ｃを介して受波用ケース部２２ｂに伝わら
ず、残響振動による影響を軽減することができ、近距離
検出能力の向上したものにできる。Therefore, the wave transmitting case portion 22a and the wave receiving case portion 22b are designed based on the frequency of the ultrasonic wave to be used. The wave transmitting case portion 22a and the wave receiving case portion 22b are designed. Each of them is an ultrasonic wave having a frequency to be used, and as shown in FIG. 3, resonates in a mode in which the opening portion becomes a node (amplitude is minimum). Therefore, the connecting piece 22c
When the vicinity of the opening of the transmitting case 22a and the vicinity of the opening of the receiving case 22b are connected with each other, the connection is made at the node (amplitude is minimum) when resonating with the ultrasonic wave of the frequency used. Therefore, when the ultrasonic wave is transmitted from the wave-transmitting diaphragm 22a 1 , the vibration of the wave-transmitting case portion 22a is not transmitted to the wave-receiving case portion 22b through the connecting piece portion 22c, and is caused by reverberation. It is possible to reduce the influence and improve the short range detection capability.
【００２１】また、近距離検出能力を向上した従来の超
音波送受波器にあっては、超音波振動子、超音波振動子
を保持するシリコンゴムなどの保持材、および、ハウジ
ングに設けるホーン部は、それぞれ２つずつ設ける必要
があった。それに対し、この超音波送受波器２０にあっ
ては、送波用ケース部２２ａと受波用ケース部２２ｂと
は連結片部２２ｃを介して一体に連結しているので、超
音波振動子２２、超音波振動子２２を保持するシリコン
ゴムなどの保持材２４、および、ハウジング２１に設け
るホーン部２１ａは１つずつ設けるだけで良いので部品
数および組み立て工数を減少することができ、コストダ
ウンが可能で形状も小型にできる。Further, in the conventional ultrasonic wave transmitter / receiver having improved short-distance detection capability, an ultrasonic vibrator, a holding material such as silicon rubber for holding the ultrasonic vibrator, and a horn portion provided on the housing are provided. , it has been necessary to provide one not two, respectively. On the other hand, in this ultrasonic wave transmitter / receiver 20, since the wave transmission case portion 22a and the wave reception case portion 22b are integrally connected via the connecting piece portion 22c, the ultrasonic transducer 22 , the holding member 24, such as silicone rubber that holds the ultrasonic transducer 22 and, since the horn portion 21a provided on the housing 21 need only provide one at a time can reduce the number of components and assembly steps, cost reduction It is also possible to make the shape small.
【００２２】また、図４に示すように、超音波や振動を
吸収遮断するスポンジゴムのような緩衝材２５を、送波
用ケース部２２ａと受波用ケース部２２ｂとの隙間に介
在すると、更に送波用ケース部２２ａの振動を受波用ケ
ース部２２ｂに伝わり難くすることができ、小型化可能
で且つ廉価にして更に近距離検出能力の向上した優れる
超音波送受波器を提供できる。As shown in FIG. 4, when a cushioning material 25 such as sponge rubber that absorbs and blocks ultrasonic waves and vibrations is interposed in the gap between the wave transmitting case portion 22a and the wave receiving case portion 22b, Further, it is possible to make it difficult for the vibration of the wave transmitting case portion 22a to be transmitted to the wave receiving case portion 22b, and it is possible to provide an excellent ultrasonic wave transmitter / receiver that can be downsized and that is inexpensive and has improved short-distance detection capability.
【００２３】[0023]
【発明の効果】請求項１記載の発明によれば、連結片部
を介して送波用ケース部と受波用ケース部とを連結する
ので、部品数および組み立て工数を減少することがで
き、コストダウンが可能で形状も小型にでき、しかも、
使用する周波数の超音波による送波用ケース部の振動モ
ードの節の部分で、連結片部を介して、送波用ケース部
と受波用ケース部とを連結することになるので、送波用
ケース部の送波時の振動が受波用ケース部に伝わり難
く、小型化可能で且つ廉価にして近距離検出能力の向上
した、優れる超音波送受波器を提供できるという効果を
奏する。According to the first aspect of the present invention, since the wave transmitting case portion and the wave receiving case portion are connected through the connecting piece portion, the number of parts and the number of assembling steps can be reduced. Cost reduction is possible, the shape can be made small, and moreover,
At the node of the vibration mode of the case for transmitting waves by the ultrasonic wave of the frequency to be used, the case for transmitting and the case for receiving are connected via the connecting piece. It is possible to provide an excellent ultrasonic wave transmitter / receiver in which vibrations of the case for use during transmission are less likely to be transmitted to the case for use for wave reception, which can be downsized and are inexpensive and have improved short-distance detection capability.
【００２４】請求項２記載の発明によれば、送波用ケー
ス部と受波用ケース部との隙間に緩衝材を介在するの
で、請求項１記載の発明の効果に加えて、更に送波用ケ
ース部の振動を受波用ケース部に伝わり難くすることが
でき、更に近距離検出能力を向上した、優れる超音波送
受波器を提供できるという効果を奏する。According to the second aspect of the present invention, the cushioning material is interposed in the gap between the wave transmission case portion and the wave reception case portion. Therefore, in addition to the effect of the first aspect of the invention, the wave transmission is further performed. It is possible to make it difficult to transmit the vibration of the use case portion to the wave receiving case portion, and to provide an excellent ultrasonic transmitter / receiver having improved short-distance detection capability.
【図１】本発明に係る一実施の形態の超音波送受波器を
示す断面図である。FIG. 1 is a cross-sectional view showing an ultrasonic wave transmitter / receiver according to an embodiment of the present invention.
【図２】上記超音波送受波器の超音波振動子を示す図で
ある。FIG. 2 is a diagram showing an ultrasonic transducer of the ultrasonic transmitter / receiver.
【図３】上記超音波送受波器の超音波振動子の振動モー
ドを説明する側面図である。FIG. 3 is a side view illustrating a vibration mode of an ultrasonic transducer of the ultrasonic transmitter / receiver.
【図４】本発明に係る他の実施の形態の超音波送受波器
の超音波振動子を示す断面図である。FIG. 4 is a sectional view showing an ultrasonic transducer of an ultrasonic wave transmitter / receiver according to another embodiment of the present invention.
【図５】超音波センサを示す原理説明図である。FIG. 5 is a principle explanatory diagram showing an ultrasonic sensor.
【図６】従来の超音波送受波器を示す断面図である。FIG. 6 is a cross-sectional view showing a conventional ultrasonic transducer.
【図７】従来の超音波送受波器の超音波振動子を示す断
面図である。FIG. 7 is a cross-sectional view showing an ultrasonic transducer of a conventional ultrasonic transducer.
【図８】従来の超音波送受波器の送受波信号の説明図で
ある。FIG. 8 is an explanatory diagram of a transmission / reception signal of a conventional ultrasonic wave transmitter / receiver.
【図９】従来の他の超音波送受波器を示す断面図であ
る。FIG. 9 is a cross-sectional view showing another conventional ultrasonic transducer.
２０ 超音波送受波器 ２１ ハウジング ２２ａ 送波用ケース部 ２２ａ1 送波用振動板 ２２ｂ 受波用ケース部 ２２ｂ1 受波用振動板 ２２ｄ 送波用圧電素子 ２２ｅ 受波用圧電素子 ２２ｃ 連結片部 ２５ 緩衝材20 ultrasonic wave transmitter / receiver 21 housing 22a wave transmitting case 22a 1 wave transmitting diaphragm 22b wave receiving case 22b 1 wave receiving diaphragm 22d wave transmitting piezoelectric element 22e wave receiving piezoelectric element 22c connecting piece 25 cushioning material
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−68397（ＪＰ，Ａ) 実開 昭57−199877（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01S 7/521 H04R 1/34 330 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-58-68397 (JP, A) Actual development Shou-57-199877 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) G01S 7/521 H04R 1/34 330
Claims (2)
波用振動板にて閉塞した送波用ケース部と、受波用圧電
素子を備え筒状体の一端を受波用振動板にて閉塞した受
波用ケース部と、送波用ケース部と受波用ケース部とを
並列に連結する連結片部とを有する超音波振動子を、ハ
ウジング内に収納した超音波送受波器であって、前記連
結片部により、送波用ケース部の開口部近傍と受波用ケ
ース部の開口部近傍とでのみ、送波用ケース部と受波用
ケース部とを連結するようにしたことを特徴とする超音
波送受波器。1. A wave-transmitting case portion having a wave-transmitting piezoelectric element closed at one end by a wave-transmitting diaphragm, and a wave-receiving piezoelectric element at one end of the cylindrical body for receiving waves. An ultrasonic transducer having an ultrasonic transducer having a wave-receiving case part closed by a diaphragm and a connecting piece part that connects the wave-transmitting case part and the wave-receiving case part in parallel is housed in a housing. In the wave device, the connecting piece connects the transmitting case and the receiving case only in the vicinity of the opening of the transmitting case and in the vicinity of the opening of the receiving case. An ultrasonic wave transmitter / receiver characterized by the above.
ス部と受波用ケース部との隙間に緩衝材を介在したこと
を特徴とする請求項１記載の超音波送受波器。2. The ultrasonic transducer according to claim 1, wherein a cushioning material is interposed in a gap between the wave transmitting case portion and the wave receiving case portion connected by the connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01210697A JP3528491B2 (en) | 1997-01-27 | 1997-01-27 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01210697A JP3528491B2 (en) | 1997-01-27 | 1997-01-27 | Ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10206529A JPH10206529A (en) | 1998-08-07 |
| JP3528491B2 true JP3528491B2 (en) | 2004-05-17 |
Family
ID=11796327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01210697A Expired - Lifetime JP3528491B2 (en) | 1997-01-27 | 1997-01-27 | Ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3528491B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100776518B1 (en) | 2004-04-26 | 2007-11-16 | 가부시키가이샤 무라타 세이사쿠쇼 | Ultrasonic sensor |
| JP2009544366A (en) * | 2006-07-21 | 2009-12-17 | カーディアック ペースメイカーズ， インコーポレイテッド | Ultrasonic transducer for use in medical devices with implanted metal cavities |
| DE102007036166B4 (en) * | 2007-08-02 | 2013-10-17 | BSH Bosch und Siemens Hausgeräte GmbH | Device for receiving at least one ultrasonic sensor in a movable device, in particular an autonomously operated dust collection robot, and movable device with such a device |
| DE102010053713A1 (en) * | 2010-12-07 | 2012-06-14 | Continental Automotive Gmbh | An electroacoustic transducer assembly and method of operating an electroacoustic transducer assembly |
| JP7105116B2 (en) * | 2018-06-22 | 2022-07-22 | 株式会社トーキン | ultrasonic sensor |
-
1997
- 1997-01-27 JP JP01210697A patent/JP3528491B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10206529A (en) | 1998-08-07 |
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