JPS58212300A - Transceiver of ultrasonic wave - Google Patents
Transceiver of ultrasonic waveInfo
- Publication number
- JPS58212300A JPS58212300A JP9542882A JP9542882A JPS58212300A JP S58212300 A JPS58212300 A JP S58212300A JP 9542882 A JP9542882 A JP 9542882A JP 9542882 A JP9542882 A JP 9542882A JP S58212300 A JPS58212300 A JP S58212300A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- piezoelectric element
- case
- thin plate
- diameter
- 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
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 210000003127 knee Anatomy 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241000234435 Lilium Species 0.000 description 1
- 241000244317 Tillandsia usneoides Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
Abstract
Description
【発明の詳細な説明】
本発明は、小型でかつ尖鋭な指向特性を有し、パルス特
性（過渡’１．′ｌ′４ｆｌ）の」：い超音波送受波器
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic transducer that is compact, has sharp directivity characteristics, and has a pulse characteristic (transient '1.'l'4fl).
空気中での超音波を送受波するための装置には、圧電セ
ラミクスの貼り合せ型素子が多く用いられており、上記
貼り合せ！−リ素子のたわみ振動の共振点・反共振点で
使用するように作られている。また、空気の機械的イン
ピーダンスは圧電セラミクスのそれに比べていちじるし
く小さいため、貼シ合せ型圧電素子を振動板と結合させ
て機械的インピーダンスの低下を図っている。Bonded piezoelectric ceramic elements are often used in devices for transmitting and receiving ultrasonic waves in the air. - It is designed to be used at the resonance and anti-resonance points of the flexural vibration of the element. Furthermore, since the mechanical impedance of air is significantly smaller than that of piezoelectric ceramics, the bonded piezoelectric element is combined with the diaphragm to reduce the mechanical impedance.
従来の超音波送受波器の構造と特性を第１図お限び第２
図にそれぞれ示す。第１図に示すように、貼り合せ型圧
電素子１の中心部に結合軸２が貫通固定され、この結合
軸２に振動板３が取付けられている。そして、貼り合せ
型圧電素子１の振動の節部が支持台４の先端に弾性接着
剤５をもって固定されている。なお、６，６′は端子、
７は貼り合せ型圧電素子１等を覆うケース、８はケース
７の上部に形成された透孔に取り付けられた保護用メツ
シュ、９．９′は、貼り合せ型圧電素子１と端子６．６
′を電気的に接続しているリード線である。The structure and characteristics of a conventional ultrasonic transducer are shown in Figures 1 and 2.
Each is shown in the figure. As shown in FIG. 1, a coupling shaft 2 is fixed through the center of the bonded piezoelectric element 1, and a diaphragm 3 is attached to this coupling shaft 2. The vibration nodes of the bonded piezoelectric element 1 are fixed to the tip of the support base 4 with an elastic adhesive 5. In addition, 6, 6' are terminals,
7 is a case that covers the bonded piezoelectric element 1, etc., 8 is a protective mesh attached to a through hole formed in the upper part of the case 7, and 9.9' is the bonded piezoelectric element 1 and the terminal 6.6.
This is the lead wire that electrically connects .
第２図は、上記構造の超音波送受波器を複数個のパルス
で駆動したときの送受波形を示したもので、立上がり、
立下がり時間が遅く、２ミリ秒以上にも及ぶものであっ
た。Figure 2 shows the transmission and reception waveforms when the ultrasonic transducer with the above structure is driven with multiple pulses.
The fall time was slow, reaching more than 2 milliseconds.
このような従来の超音波１１送ｉ波器を用いて、短い時
間間隔で測定情報を得る必要がある場合、受波器によっ
て受信された信号は、立上がり、立下がり時間が長いた
めに、受信信号がピーク値になる１での時間がかかる。When it is necessary to obtain measurement information at short time intervals using such a conventional ultrasonic wave transmitter, the signal received by the wave receiver has a long rise and fall time, so It takes time for the signal to reach its peak value.
あるいは受信信号が立下がる前に次の信号が受信される
など、正確な測定情報が得られなかった。Alternatively, accurate measurement information could not be obtained because the next signal was received before the received signal fell.
また、送受波を単体の素子で行なわせる場合、送波させ
てただちに受信用能な状態になる１で、かなりの時間を
要し、その間、測定情報は得られなかった。Furthermore, when transmitting and receiving waves using a single element, it takes a considerable amount of time to transmit waves and immediately become ready for reception, during which time no measurement information can be obtained.
さらに圧電セラミクスを用いた超音波送受波器に尖鋭な
指向特性を安水すると、振動板、貼り合せ型圧電素子お
」：び貼り合せ型圧電素子を支持するための支持台がい
ちじるしく大きくなるという欠点があった。たとえ大き
な振動板を用いても、ピストン振動させることＬ１゛困
難であるため、指向特性を著しく尖鋭にすることは不可
能であった。Furthermore, by adding sharp directional characteristics to an ultrasonic transducer using piezoelectric ceramics, the diaphragm, the bonded piezoelectric element, and the support base for supporting the bonded piezoelectric element become significantly larger. There were drawbacks. Even if a large diaphragm is used, it is difficult to cause the piston to vibrate, so it has been impossible to make the directivity characteristics extremely sharp.
そこで、ホーンを用いて指向特性を尖鋭にしようとする
と、機械的Ｑを低下させてパルス特性を、、Ｊ、ッｔ６
ｊ＆Ｎ：九、□ヵ、え。Therefore, if we try to sharpen the directivity using a horn, the mechanical Q will be lowered and the pulse characteristics will become...
j&N: 9, □ka, eh.
本発明は、貼り合せ型圧電素子の中心部に振動板を設け
、機械的振動を抑制するように振動板の周囲を弾性ゴム
などの弾性材でケースに弾性的に固定するとともに、開
口部を設けた薄板及びホーンを付加することにより、尖
鋭な指向特性かつ急峻なパルス特性を有する超音波送受
波器を実現し、上述の問題点を解決したものである。The present invention provides a diaphragm in the center of a bonded piezoelectric element, elastically fixes the periphery of the diaphragm to a case with an elastic material such as elastic rubber to suppress mechanical vibration, and By adding the provided thin plate and horn, an ultrasonic transducer having sharp directivity characteristics and steep pulse characteristics is realized, and the above-mentioned problems are solved.
以下、本発明の一実施例について、図面を用いて説明す
る。An embodiment of the present invention will be described below with reference to the drawings.
第３図はこの実施例の断面図である。FIG. 3 is a sectional view of this embodiment.
貼り合せ型圧電素子１１の中心部に配した結合軸１２に
、金属あるいは樹脂より形成された振動板１３が取り付
けられている。振動板１３の周辺部は、機械的振動を抑
制するように円環状に形成された弾性ゴムなどの緩衝材
２ｏを介して、円筒状のケース１７の内側面に弾性的に
固定されている。ケース１了の底部には吸音材２１が設
けられている。振動板１３の前方には、中心部に円状の
開口部２２と、結合軸１２を通過する直線を中心にした
同心円周上に設けた他の開口部２２′とを有する薄板２
３が設置されている。薄板２３と貼り合せ型圧電素子１
１などを覆うケース１７とは、放物面ホーン２４の喉部
に嵌入され、保持されて６、、−：・
いる。１９ 、１９’は貼り合せ型圧電素子１１と端子
１６ 、１６’を電気的に１疑続しているリード線であ
る。A vibration plate 13 made of metal or resin is attached to a coupling shaft 12 arranged at the center of the bonded piezoelectric element 11 . The periphery of the diaphragm 13 is elastically fixed to the inner surface of the cylindrical case 17 via a buffer material 2o such as elastic rubber formed in an annular shape so as to suppress mechanical vibrations. A sound absorbing material 21 is provided at the bottom of the case 1. In front of the diaphragm 13 is a thin plate 2 having a circular opening 22 in the center and other openings 22' provided on a concentric circumference centered on a straight line passing through the coupling shaft 12.
3 is installed. Thin plate 23 and bonded piezoelectric element 1
A case 17 that covers the parabolic horn 24 is fitted into the throat of the parabolic horn 24 and held there. Lead wires 19 and 19' electrically connect the bonded piezoelectric element 11 and the terminals 16 and 16'.
上記薄板２３の開１］部２２ 、２２’は、貼り合せ型
圧電素子１１の大きさとその厚さ、振動板１３の大きさ
と厚さと中心角、および緩衝材２０の内径などにより、
形状が異なる。貼り合せ型圧電素子１１の直径が約９．
１ｍｍ１厚さが０ 、６ ｍｍで、振動板１３が底面の
直径１７ｍｍの円錐状であるとき、この超１１波送受波
器の子要な共振周波数は了ｏｍ近傍であるが、種々検討
した結果、最良の指向特性を示す薄板１３ｔ：ｔ、中心
部に直径０．８ｍｍの複数個の円状開口部２２と、直径
８ ｍｌ＋１円周上に直径０．６ｍｍの複数個の円状１
ｊ旧１部２２′とを設けた第４図に示す形状のものであ
る。The openings 22 and 22' of the thin plate 23 are determined by the size and thickness of the bonded piezoelectric element 11, the size, thickness, and central angle of the diaphragm 13, and the inner diameter of the cushioning material 20.
Different shapes. The diameter of the bonded piezoelectric element 11 is approximately 9 mm.
When the thickness of 1 mm is 0.6 mm and the diaphragm 13 has a conical shape with a bottom diameter of 17 mm, the essential resonance frequency of this ultra-11-wave transducer is close to 0.5 mm, but as a result of various studies. , a thin plate 13t:t showing the best directivity characteristics, a plurality of circular openings 22 with a diameter of 0.8 mm in the center, and a plurality of circular openings 22 with a diameter of 0.6 mm on the circumference of a diameter of 8 ml + 1.
It has the shape shown in FIG. 4, in which an old first part 22' is provided.
次に上記本発明の構造による超音波送受波器の指向′１
！１性を第６図に示す。同図（八は振動板１３の前方に
薄板２３を設置したものの指向特性であり、同図（ト）
）は設置する前のものの指向特性である。これから半減
角、ザイドロープがいちじるしく減少していることがわ
かる。また、空間的に、たとえば上下、左右で、はぼ均
一な指向特性が得られるようになった。さらに、送波感
度もｅｄＢ程度増大した。Next, the orientation '1 of the ultrasonic transducer according to the structure of the present invention is as follows.
! unisexuality is shown in Figure 6. In the same figure (8 is the directional characteristic of the thin plate 23 installed in front of the diaphragm 13,
) is the directional characteristic before installation. It can be seen from this that the half angle and the zyde rope are significantly reduced. In addition, spatially, for example, vertically, horizontally, and horizontally, more or less uniform directivity characteristics can be obtained. Furthermore, the transmitting sensitivity also increased by about edB.
第６図にこの超音波送受波器のパルス特性を示す。パル
スの立上がり・立下がり時間は０．２ミリ秒以下である
。Figure 6 shows the pulse characteristics of this ultrasonic transducer. The rise and fall times of the pulse are 0.2 milliseconds or less.
第７図（Ａ） 、 （Ｂ） 、 （Ｑは緩衝材２ｏの内
径を１２ｍｍ、１３ｍｍ、 １４ｍｍと変化させたとき
の、円錐状の上記振動板１３の底面の直径と音圧半減角
、立上り時間、送波音圧レベルとの関係をそれぞれ示し
ている。なお、いずれにおいても、曲ａ１０１は緩衝材
２ｏの内径が１２ｍｍのときであり、曲線１０２゜１０
３はその内径がそれぞれ１３１１ｍ、 １４ｍｍのとき
である。図から明らかなように、振動板１３の直径が増
大するに伴い、概ね、送波音圧レベルは増大するが、立
上り時間も長く：′な、、、る。音圧半減角については
、本発明の構造によれば、緩衝材２０１．の直径が１２
１ｎｍ、 １３ｍｍ、 １４ｍｍで、振動板１３の直径
が１４〜１８ｍｍの範囲で大きな変化はなかった。した
がって、振動板１３の直径が１３ｍｍ以下であるイ、の
シ１１、送波音圧レベルの点で不利となる。振動板１３
の直径が２０ｍｍ以上のものは、音圧半減角や立上り時
間、送信音圧レベルの点で大きな効果は見い１１１せな
いばかりでなく、上記の大きな振動板１３に最適な貼り
合ぜ型圧電素子１１の大きさも大きくなり、超音波送受
波器の大きさは増大する。な才？、貼り合せ型圧電素子
１１の直径は、９．１ｍｍ、厚さＥＪ、’ ０．６１１
１１１１ Ｘ ２枚で、放物面ホーン２４ｉ１直径５５
１１１１１１のときの実験値である。Figure 7 (A), (B), (Q is the diameter of the bottom surface of the conical diaphragm 13, the half angle of sound pressure, and the rise when the inner diameter of the buffer material 2o is changed to 12 mm, 13 mm, and 14 mm. The relationship between time and transmitted sound pressure level is shown respectively.In both cases, the curve a101 is when the inner diameter of the cushioning material 2o is 12 mm, and the curve 102°10
3 is when the inner diameters are 1311 m and 14 mm, respectively. As is clear from the figure, as the diameter of the diaphragm 13 increases, the transmitted sound pressure level generally increases, but the rise time also increases. Regarding the sound pressure half angle, according to the structure of the present invention, the cushioning material 201. The diameter of is 12
When the diameter of the diaphragm 13 was 1 nm, 13 mm, and 14 mm, there was no significant change within the range of 14 to 18 mm. Therefore, in case 11, where the diameter of the diaphragm 13 is 13 mm or less, there is a disadvantage in terms of the transmitted sound pressure level. Vibration plate 13
A bonded piezoelectric material with a diameter of 20 mm or more not only does not have a significant effect in terms of sound pressure half-reduction angle, rise time, and transmitted sound pressure level, but also is suitable for the large diaphragm 13 mentioned above. The size of the element 11 also increases, and the size of the ultrasonic transducer increases. What talent? , the diameter of the bonded piezoelectric element 11 is 9.1 mm, and the thickness EJ' 0.611
1111 x 2 pieces, parabolic horn 24i1 diameter 55
This is an experimental value when 111111.
第８図は、振動板１３の直径を１６［１１１１１−、”
ｆｆＩＩＩｌｓ１７ｍｍと変えたときの、緩衝旧２０
の内径と緒特性との関係を示している。な３１、・、図
の曲線１１１は振動板１３の直径が１５ｍｍであり、曲
線１１２゜１１３はそれぞれの直径が１６ｍｍ、１７ｍ
ｍであるときの特性である。図から明らかなように、緩
衝材２０の内径の減少１ｆｆｌ′：：伴ない、おおむね
立上がり時間は短くなるが、送淀ｊ″？１１．レベルも
減少する傾向にある。□しかしながら、緩衝イＡ２ｏの
内径と振動板１３の直径の比が約０．８であるとき、送
信音圧レベルは極大値をとり、このとき、音圧半減角も
最小値を示す。さらに緩衝材２ｏの内径を小さくすると
サイドロープも増大しく図示せず）、送信音圧レベルは
減少し、立上り時間も大きく減少しなくなる。FIG. 8 shows that the diameter of the diaphragm 13 is 16[11111-,"
Buffer old 20 when changing to ffIIIls 17mm
It shows the relationship between the inner diameter of the tube and the tube characteristics. In the curve 111, the diameter of the diaphragm 13 is 15 mm, and in the curves 112 and 113, the diameters are 16 mm and 17 mm, respectively.
This is the characteristic when m. As is clear from the figure, as the inner diameter of the buffer material 20 decreases, the rise time generally becomes shorter, but the stagnation level also tends to decrease. When the ratio of the inner diameter of the buffer material 2o to the diameter of the diaphragm 13 is about 0.8, the transmitted sound pressure level takes a maximum value, and at this time, the sound pressure half-reduction angle also shows a minimum value. As a result, the side ropes also increase (not shown), the transmitted sound pressure level decreases, and the rise time no longer decreases significantly.
駆動周波数７ｏｋＨ＋のとき、本発明による超音波送受
波器のホーン２４の直径と音圧半減角との関係を第９図
に示す。図中、曲線は、ピストン振動を行なう円形振動
板の場合の音圧半減角の計算値である。この場合、指向
係数Ｒ（のけ次式で表わさここで、■１は第１ベツ七ル
関数、ａは音源の半径、Ｋは波数である。（１）式でＲ
（の−％として音圧半減角θｈについて解くと、次式で
近似できる。FIG. 9 shows the relationship between the diameter of the horn 24 of the ultrasonic transducer according to the present invention and the half-reduction angle of the sound pressure when the driving frequency is 7 okH+. In the figure, the curve is the calculated value of the half-reduction angle of sound pressure in the case of a circular diaphragm that vibrates a piston. In this case, the directivity coefficient R (represented by the exponential equation, where ■1 is the first Bez7 function, a is the radius of the sound source, and K is the wave number. In equation (1), R
When solving for the sound pressure half-reduction angle θh as -% of (, it can be approximated by the following equation.
ただし、ｄは音源の直径Ｃｍｍ〕、ｆは使用周波数Ｃｋ
ｌｋ ］、Ｃは音速Ｃｍ／秒〕である。However, d is the diameter of the sound source Cmm], f is the frequency used Ck
lk], C is the speed of sound Cm/sec].
１０１、−ミ
図中の曲線は（２）式でとわされるものである。また、
このとき、第１ザイドローブは０）式からメインロープ
に比して約１ｙ、ｅｄＢ低下する。101, - The curve in the diagram is one that is passed by equation (2). Also,
At this time, the first Zydrobe is lowered by about 1y, edB, compared to the main rope from equation 0).
したがって、本発明による超音波送受波器は、ピストン
振動を行なう円形振動板として解析した泪算飴と比して
、１“？圧半減角お」：び第」サイドロープとも小さな
Ｉｌｌ′ｒを示すことが明らかになった。Therefore, the ultrasonic transducer according to the present invention has a small Ill'r with a 1" pressure half-reduction angle O": and a small side rope, compared to a lily pad analyzed as a circular diaphragm that vibrates a piston. It became clear that it shows.
斗だ、超音波＋１’１ＩｌＮＩ醋レニして、たとえば、
ビデオカメラのオートフ４−カスに使用する場合、カメ
ラの画角、可能ｄ測距範囲、測距稈を度の点から、サイ
ド１−１−ブを抑制した狭指向特性、高感度特性、良好
な過渡！１１１性が要求される。狭指向性を実現するに
にＪｌ、（２）式から明らかなように音源の大きさを拡
大し、使用周波数をＱくする必要がある。しかしながら
、民生用部品としては音源の大きさに制限がある。一方
、使用周波数が高くなるに伴ない、空気に」：る超合波
吸収し１．増大し、可能側距離範囲が減少する。For example, if you use ultrasound + 1'1IlNI, for example,
When used as an autofocus for a video camera, the angle of view of the camera, the possible distance measurement range, the distance measurement culm, narrow directivity with suppressed side beams, high sensitivity characteristics, and good What a transition! 111 nature is required. In order to achieve narrow directivity, it is necessary to increase the size of the sound source and increase the frequency used, as is clear from equation (2). However, as a consumer component, there is a limit to the size of the sound source. On the other hand, as the operating frequency increases, the air absorbs the supermultiplexed waves.1. increases, and the possible distance range decreases.
したがって、上記の」：うな使用例の場合、本発明に」
：る構造の超音波送受波器は７０±１０ｋｌｂの駆動周
波数のものが望ましい。Therefore, in the above-mentioned use cases, the present invention applies to
It is preferable that the ultrasonic transducer of this structure has a driving frequency of 70±10 klb.
以上のように、本発明の超音波送受波器は、尖鋭な指向
特性と良好なパルス特性を有し、音波を用いた距離計等
、尖鋭な指向特性が要求される超音波応用計測にはきわ
めて有用なものである。As described above, the ultrasonic transducer of the present invention has sharp directivity characteristics and good pulse characteristics, and is suitable for ultrasonic applied measurements that require sharp directivity characteristics, such as distance meters using sound waves. It is extremely useful.
第１図は従来の超音波送受波器の一例を示す断面図、第
２図はそのパルス特性を示す図である。
第３図は本発明の超音波送受波器の一実施例を示す断面
図、第４図はその構成要素である薄板の一例を示す斜視
図、第５図は同じく薄板の効果を示す図、第６図はこの
超音波送受波器のパルス特性を示す図、第７図（へ）、
（Ｂ） 、 （Ｑは本発明の超音波送受波器における
振動板の直径と音圧半減角、立」二がり時間、送信音圧
レベルとの関係をそれぞれ示す図、第８図（５）、 （
Ｂ） 、 （Ｃ）は同じく緩衝材の内径と緒特性との関
係をそれぞれ示す図、第９図はホー１ 、ｊｌｌ
ンの直径と音圧半減角との関係を示す図である。
１１・・・・・・貼り合せ型圧電素子、１３・・・・・
・振動板、１７・・・・・・ケース、２０・・・・・・
緩衝材、２１・・・・・・吸音材、２２ 、２２’・・
・・・・開口部、２３・・・・・・薄板、２４・・・・
・・ホーン。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名１１
１１、。
第１図
第３図
＠ ５ 図
Ｃαン
（ν）
第６図
第７図
ｔＡ）
ｔＺ ＩＡ １６ １θ ２θ
徐初オ入のＪ（炎（ｆＩ−Ｊ
第８図
（＾ン
ＩＱ １２ １４
Ｉ６Ａス［丁２Ｌ才つＰ３イＪヒむ９・ヘノ第９図
４６ ５θ ６０
、ｆ、−レ引［淡ト九〕FIG. 1 is a sectional view showing an example of a conventional ultrasonic transducer, and FIG. 2 is a diagram showing its pulse characteristics. FIG. 3 is a sectional view showing one embodiment of the ultrasonic transducer of the present invention, FIG. 4 is a perspective view showing an example of a thin plate that is a component thereof, and FIG. 5 is a diagram similarly showing the effect of the thin plate. Figure 6 is a diagram showing the pulse characteristics of this ultrasonic transducer, Figure 7 (f),
(B), (Q is a diagram showing the relationship between the diameter of the diaphragm, the half-sound pressure angle, the rising time, and the transmitted sound pressure level in the ultrasonic transducer of the present invention, FIG. 8 (5) , (
B) and (C) are diagrams showing the relationship between the inner diameter of the cushioning material and the cable characteristics, respectively, and FIG. 9 is a diagram showing the relationship between the diameter of the holes 1 and 1 and the half-reduction angle of sound pressure. 11... Bonded piezoelectric element, 13...
・Diaphragm, 17... Case, 20...
Cushioning material, 21...Sound absorbing material, 22, 22'...
...Opening, 23...Thin plate, 24...
··Horn. Name of agent: Patent attorney Toshio Nakao and 1 other person11
11. Figure 1 Figure 3 @ 5 Figure Cαn (ν) Figure 6 Figure 7 tA) tZ IA 16 1θ 2θ
I6Asu [D2L Saitsu P3 IJ Himu9 Heno 9th figure 46 5θ 60 , f, -reduction [Light 9]
Claims (5)
記貼り合せ型圧電素子を封入するケース、前記振動板の
周辺部と前記ケースの内側面とに接触するように配され
ている緩衝材、前記貼り合せ型圧電素子の前方に設置し
た開口部を設けた薄板、および、前記ケースと前記薄板
を封入し固定するホーンを少なくとも有し、前記振動板
を前記緩衝材により前記ケースに弾性的に固定して機械
的振動を抑制し、共振周波数を７０±１０ ｋＨｚとし
たことを特徴とする超音波送受波器。(1) A bonded piezoelectric element with a diaphragm provided in the center, a case enclosing the bonded piezoelectric element, and arranged so as to be in contact with the periphery of the diaphragm and the inner surface of the case. It has at least a cushioning material, a thin plate with an opening installed in front of the bonded piezoelectric element, and a horn for enclosing and fixing the case and the thin plate, and the diaphragm is attached to the case by the cushioning material. An ultrasonic transducer characterized by being elastically fixed to suppress mechanical vibration and having a resonant frequency of 70±10 kHz.
有し、かつ直径７〜１０ｍｍの円板形であることを特徴
とする特許請求の範囲第１項記載の超音波送受波器。(2) Ultrasonic wave transmission and reception according to claim 1, wherein the bonded piezoelectric element has a conical diaphragm in the center and is disk-shaped with a diameter of 7 to 10 mm. vessel.
ることを特徴とする特許請求の範囲第２項記載２ ニー の超音波送受波８：；。(3) The diaphragm has a conical shape with a bottom diameter of 14 to 20 mm. (2) Knee ultrasonic transmission and reception 8: ;.
面の直径の比が、０．６〜０．９ であることを特徴と
する特ｒ１請求の範囲第１項記載の超音波送受波器。(4) The ratio of the inner diameter of the contact surface between the diaphragm and the buffer moon to the diameter of the bottom surface of the diaphragm is 0.6 to 0.9. Ultrasonic transducer.
一にに直径０．５〜１ ｍｍの複数個の円形状開口部を
有する円板状薄板であることを特徴とする特許請求の範
囲第４項記載の超音波送受波器。(5) The thin plate is a disk-shaped thin plate having a plurality of circular openings with a diameter of 0.5 to 1 mm in the center and on a concentric circumference near a radius of 4 mm. The ultrasonic transducer according to item 4.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9542882A JPS58212300A (en) | 1982-06-03 | 1982-06-03 | Transceiver of ultrasonic wave |
| US06/439,549 US4607186A (en) | 1981-11-17 | 1982-11-05 | Ultrasonic transducer with a piezoelectric element |
| EP82110290A EP0080100B1 (en) | 1981-11-17 | 1982-11-08 | Ultrasonic transducer |
| DE8282110290T DE3272470D1 (en) | 1981-11-17 | 1982-11-08 | Ultrasonic transducer |
| CA000415697A CA1202112A (en) | 1981-11-17 | 1982-11-16 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9542882A JPS58212300A (en) | 1982-06-03 | 1982-06-03 | Transceiver of ultrasonic wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58212300A true JPS58212300A (en) | 1983-12-09 |
Family
ID=14137417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9542882A Pending JPS58212300A (en) | 1981-11-17 | 1982-06-03 | Transceiver of ultrasonic wave |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58212300A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012239023A (en) * | 2011-05-11 | 2012-12-06 | Denso Corp | Parametric speaker |
-
1982
- 1982-06-03 JP JP9542882A patent/JPS58212300A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012239023A (en) * | 2011-05-11 | 2012-12-06 | Denso Corp | Parametric speaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4607186A (en) | Ultrasonic transducer with a piezoelectric element | |
| US4456849A (en) | Piezoelectric ultrasonic transducer with damped suspension | |
| GB1159337A (en) | Piezoelectric Transducers | |
| US3849679A (en) | Electroacoustic transducer with controlled beam pattern | |
| US4458170A (en) | Ultrasonic transmitter-receiver | |
| US4414436A (en) | Narrow-frequency band acoustic transducer | |
| JP3158809B2 (en) | Ultrasonic sensor | |
| GB2057225A (en) | Piezo-electric loudspeaker | |
| US4462256A (en) | Lightweight, broadband Rayleigh wave transducer | |
| JPS58212300A (en) | Transceiver of ultrasonic wave | |
| CA1180100A (en) | Ultrasonic transmitter-receiver | |
| US3253674A (en) | Ceramic microphone | |
| JPS5888999A (en) | Ultrasonic wave transmitter and receiver | |
| JPS58124399A (en) | Ultrasonic wave transceiver | |
| JPS6126397A (en) | Ultrasonic transmitter-receiver | |
| JPS58124400A (en) | Ultrasonic wave transceiver | |
| JPS58124396A (en) | Ultrasonic wave transceiver | |
| JPS60212097A (en) | Ultrasonic wave transmitter-receiver | |
| JPS58124398A (en) | Ultrasonic wave transceiver | |
| JPS6055798A (en) | Ultrasonic wave transmitting and receiving device | |
| JPS5884600A (en) | Ultrasonic wave transmitter and receiver | |
| JPS6025957B2 (en) | Ultrasonic transducer | |
| CN215932137U (en) | Ultrasonic sensor | |
| JPS6126398A (en) | Ultrasonic transmitter-receiver | |
| JPS5885698A (en) | Ultrasonic transmitter and receiver |