JPH089995Y2 - Ultrasonic transducer - Google Patents
Ultrasonic transducerInfo
- Publication number
- JPH089995Y2 JPH089995Y2 JP1993016997U JP1699793U JPH089995Y2 JP H089995 Y2 JPH089995 Y2 JP H089995Y2 JP 1993016997 U JP1993016997 U JP 1993016997U JP 1699793 U JP1699793 U JP 1699793U JP H089995 Y2 JPH089995 Y2 JP H089995Y2
- Authority
- JP
- Japan
- Prior art keywords
- base
- case
- weight
- vibration mode
- piezoelectric element
- 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
Landscapes
- Transducers For Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、屋外等で発生する音波
を金属製ケースの内部に設けた圧電素子により受信して
出力信号として抽出する受波器として、または前記圧電
素子が振動子となって超音波を発生させる送波器として
用いられ、例えば自動車の後方検知装置等への適用が可
能な超音波送受波器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave receiver that receives a sound wave generated outdoors or the like by a piezoelectric element provided inside a metal case and extracts it as an output signal, or the piezoelectric element functions as a vibrator. The present invention relates to an ultrasonic wave transmitter / receiver which is used as a wave transmitter for generating an ultrasonic wave and is applicable to, for example, a rear detection device of an automobile.
【０００２】[0002]
【従来の技術】この種の、超音波送受波器は、例えば特
開昭５７ー５６０９９号等に開示されるように公知であ
る。2. Description of the Related Art An ultrasonic wave transmitter / receiver of this type is known as disclosed in, for example, JP-A-57-56099.
【０００３】[0003]
【考案が解決しようとする課題】ところで、前記超音波
送受波器を取付部に支持する場合において、送波器とし
て用いる場合には、その基台から取付部に振動漏れを生
じると、出力が低減したり、取付部に振動が発生して、
雑音を生じる等種々の不都合を生じる。また受波器とし
て用いる場合には、前記取付部からの振動が基台を介し
て圧電素子に伝搬して、出力信号にノイズを発生させ、
Ｓ／Ｎ比を低減させる等種々の弊害を生じる。By the way, when the ultrasonic wave transmitter / receiver is supported by the mounting portion, when it is used as a wave transmitter, if vibration leakage occurs from its base to the mounting portion, the output is output. Decrease or vibration occurs in the mounting part,
It causes various inconveniences such as noise. When used as a wave receiver, the vibration from the mounting portion propagates to the piezoelectric element through the base to generate noise in the output signal,
There are various problems such as reduction of S / N ratio.
【０００４】本考案は、可及的にその取付基部と、圧電
素子間の振動を絶縁するとともに、その送信音圧及び受
信感度を良好とすることを目的とするものである。An object of the present invention is to insulate vibration between the mounting base and the piezoelectric element as much as possible, and to improve the transmission sound pressure and the reception sensitivity.
【０００５】[0005]
【課題を解決するための手段】本考案は、基台に二本の
杆状入出力端子を支持してなるベース部に、金属製ケー
スの内面に圧電素子を接合してなるケース部を密閉状に
被着し、前記圧電素子の表裏面の電極と前記入出力端子
とを電気的に接続してなり、強制振動モードによって振
動する周波数領域に適用する超音波送受波器において、
前記ベース部の重さＭ1 と、ケース部の重さＭ2 との比
ｆ（＝Ｍ1 ／Ｍ2 ）を２以上とし、かつ基台の直径をＤ
とすると、基台の中心から0.40Ｄ〜0.45Ｄの強制振動モ
ードの節の位置で、取付部により周辺支持してなるもの
である。SUMMARY OF THE INVENTION According to the present invention, a case portion formed by joining a piezoelectric element to an inner surface of a metal case is hermetically sealed to a base portion supporting two rod-shaped input / output terminals on a base. In the ultrasonic transducer, which is applied in a frequency range in which the electrodes on the front and back surfaces of the piezoelectric element and the input / output terminals are electrically connected to each other and vibrates in a forced vibration mode,
Weigh M 1 of the base portion, the ratio f (= M 1 / M 2) between the weight M 2 of the case portion is 2 or more, and a diameter of the base D
Then, at the position of the node in the forced vibration mode of 0.40D to 0.45D from the center of the base, the peripheral portion is supported by the mounting portion.
【０００６】[0006]
【作用】後述の実験により明らかなように、強制振動モ
ードではｆ＝１で送信音圧は84dBとなり、ｆ＝２で急峻
に上昇する。また取付部を、基台の中心から0.40Ｄ〜0.
45Ｄ（Ｄ；基台１の直径）の位置に設けることにより、
前記取付部が強制振動モードの節の位置となり、該振動
モードによって振動する周波数領域に最適に適用でき
る。As will be apparent from the experiments described below, in the forced vibration mode, the transmitted sound pressure becomes 84 dB at f = 1 and sharply rises at f = 2. Also, the mounting part is 0.40D to 0. from the center of the base.
By installing at the position of 45D (D; diameter of the base 1),
The mounting portion is located at the node of the forced vibration mode, and can be optimally applied to the frequency region vibrating in the vibration mode.
【０００７】[0007]
【実施例】前記構成をさらに詳しく説明する。ベース部
の振動形態は、強制振動モードと、自由振動モードとが
あり、前者は周波数40KHｚ未満で顕著に発生し、後者は
周波数40KHｚ以上で顕著に発生する。また前者にあって
は、基台の直径をＤとすると、その中心から0.40Ｄ〜0.
45Ｄの位置、理論上は 0.417Ｄの位置を節とする振動態
様で屈曲振動する。後者は、該基台の中心から0.30Ｄ〜
0.35Ｄの位置、理論上は0.33Ｄの位置を節として振動す
る。EXAMPLES The above-mentioned constitution will be described in more detail. The vibration mode of the base portion includes a forced vibration mode and a free vibration mode. The former remarkably occurs at a frequency of less than 40 kHz, and the latter remarkably occurs at a frequency of 40 kHz or higher. In the former case, if the diameter of the base is D , 0.40 D to 0.
Flexural vibration occurs in a vibration mode with a node at 45 D , theoretically 0.417 D. The latter is 0.30 D from the center of the base.
It vibrates with the position of 0.35 D , theoretically the position of 0.33 D as a node.
【０００８】ところで、前記強制振動モードにおいて、
ベース部の重さＭ1 と、ケース部の重さＭ2 との重量比
ｆ（＝Ｍ1 ／Ｍ2 ）と、その送信音圧及び受信感度との
関係を測った。By the way, in the forced vibration mode,
The relationship between the weight ratio f (= M 1 / M 2 ) of the weight M 1 of the base portion and the weight M 2 of the case portion, and the transmission sound pressure and the reception sensitivity was measured.
【０００９】ここで測定に供した超音波送受波器は、図
１に示す構成のものである。The ultrasonic transmitter / receiver used for the measurement is shown in FIG.
It has the structure shown in FIG.
【００１０】すなわち１は円板状の金属製基台であっ
て、その中心から少し偏位して上下方向の挿入用透孔２
が設けられている。また基台１外面には前記透孔２との
点対称位置に、アース端子となる杆状端子４が突設され
ている。That is, 1 is a disk-shaped metal base, which is slightly displaced from the center thereof and has a vertical through hole 2 for insertion.
Is provided. Further, on the outer surface of the base 1, a rod-shaped terminal 4 serving as a ground terminal is provided so as to project at a position symmetrical with respect to the through hole 2.
【００１１】前記透孔２には杆状端子５が挿通し、該透
孔２内に注入したガラスシール６等により基台１と電気
的に絶縁して保持されている。前記した各構成によりベ
ース部Ａが構成される。A rod-shaped terminal 5 is inserted into the through hole 2 and is electrically insulated from the base 1 and held by a glass seal 6 injected into the through hole 2. The base portion A is configured by the above-described configurations.
【００１２】１０は、下面開放の截頭円錐形金属製ケー
スであり、音波送受部となる截頭部内面にＰＺＴ等の圧
電材料によってなる板状の圧電素子１１がその一面の電
極１２ａを接合して固着され、他面の電極１２ｂをケー
ス内方に臨ませている。また金属製ケース１０の下端周
部には外方へ突出する接合鍔縁１３が形成されている。
前記した各構成によりケース部Ｂが構成される。Reference numeral 10 denotes a frustoconical metal case whose bottom surface is open, and a plate-shaped piezoelectric element 11 made of a piezoelectric material such as PZT joins the electrode 12a on one surface to the inner surface of the frusto-conical portion which serves as a sound wave transmitting / receiving portion. Then, the electrodes 12b on the other surface are exposed to the inside of the case. In addition, a joint flange 13 that projects outward is formed on the lower end peripheral portion of the metal case 10.
The case portion B is configured by the above-described configurations.
【００１３】前記基台１と金属製ケース１０は、前記杆
状端子５と圧電素子１１の電極１２ｂを導線１４により
接続してから、前記接合鍔縁１３を基台１の上周面に溶
接し、前記金属製ケース１０と基台１によってその内部
を水密状に閉鎖される。前記送受波器を取付部Ｃにより
支持するには、例えば図１のように、取付部Ｃの下部に
設けた支持座２０を基台１の中心から0.40Ｄ〜0.45Ｄ位
置に接触させ、さらに前記取付部Ｃの上部に上下方向に
螺合した緊締螺子２１の先端を基台１の中心から0.40Ｄ
〜0.45Ｄ位置に当接させて挟持することにより施され
る。この際、杆状入出力端子４，５と、その接続機器側
間の振動を遮断するために、前記端子４， ５と接続機器
とをリード線２２，２３とか導電性コイル材により電気
的に接続する必要がある。かかる構成において、その重
さ等は次の通りである。In the base 1 and the metal case 10, the rod-shaped terminal 5 and the electrode 12b of the piezoelectric element 11 are connected by a conductive wire 14, and then the joint flange 13 is welded to the upper peripheral surface of the base 1. Then, the metal case 10 and the base 1 close the inside in a watertight manner. The transmitter / receiver is attached by the mounting portion C.
In order to support it, for example, as shown in FIG.
0.40D to 0.45D from the center of the base 1 with the support seat 20 provided
The upper part of the mounting portion C in the vertical direction.
0.40D from the center of the base 1 with the tip of the tightened tightening screw 21
It is applied by abutting and pinching at ~ 0.45D position
It At this time, the rod-shaped input / output terminals 4 and 5 and the connected device side
In order to block vibration between the terminals 4 and 5 and the connected device
Is electrically connected to the lead wires 22 and 23 or a conductive coil material.
Need to be connected. In this structure, the weight and the like are as follows.
【００１４】『ケース部Ｂ』"Case part B"
【００１５】・重さ； 2.3ｇ（金属製ケース 2.2ｇ，圧
電素子 0.1ｇ）Weight: 2.3 g (metal case 2.2 g, piezoelectric element 0.1 g)
【００１６】・金属製ケースの材質及び形状；ステンレ
ス鋼製，Ｄ＝18mm, ｂ＝11mm，ｃ＝６mm，ａ＝１mmMaterial and shape of metal case; stainless steel, D = 18 mm, b = 11 mm, c = 6 mm, a = 1 mm
【００１７】・圧電素子の材質及び形状；チタン酸ジル
コン酸鉛，直径＝９mm，厚さ＝0.3mmMaterial and shape of piezoelectric element: lead zirconate titanate, diameter = 9 mm, thickness = 0.3 mm
【００１８】『ベース部Ａ』"Base A"
【００１９】・重さ；試料イ（ 2.3ｇ），試料ロ（3.45
ｇ），試料ハ（ 4.6ｇ），試料ニ（5.75ｇ），試料ホ
（ 6.9ｇ）Weight: Sample A (2.3 g), Sample B (3.45)
g), sample c (4.6 g), sample d (5.75 g), sample e (6.9 g)
【００２０】・基台の材質及び形状；ステンレス鋼製，
直径＝18mm，厚さは各試料毎にその設定重量に対応して
決定· Material and shape of base: stainless steel,
Diameter = 18 mm, thickness is determined for each sample according to its set weight
【００２１】・杆状入出力端子；鉄ーニッケル合金製，
直径１mm，ｅ＝10mm· Rod-shaped input / output terminals; made of iron-nickel alloy,
Diameter 1mm, e = 10mm
【００２２】『結果』"Result"
【００２３】 各試料イ〜ホをケース部Ａと組合わせ
て、重量比ｆが異なる送受波器を構成し、その送信音圧
を計測した結果、図２のようになった。この結果から示
されるように、強制振動モードではｆ＝１で送信音圧は
84dBとなり、ｆ＝２で急峻に上昇して108dB となり、さ
らにｆ＝２．５で109dB,ｆ＝３で113dB となり、それ以
後重量比ｆの増加とともに漸増する。The samples a to e were combined with the case portion A to form a transducer with different weight ratios f, and the transmitted sound pressure was measured . The result is as shown in FIG . As shown in this result, in the forced vibration mode, the transmitted sound pressure is f = 1 at f = 1.
It becomes 84 dB, sharply rises to 108 dB at f = 2, becomes 109 dB at f = 2.5, becomes 113 dB at f = 3, and thereafter gradually increases as the weight ratio f increases.
【００２４】 重量比ｆと、その受信感度との関係は
図３のようになった。この結果から示されるように、強
制振動モードはｆ＝１で受信感度は−64dBとなりｆ＝
１．５で急峻に上昇して−55dBとなり、さらにｆ＝２で
−53.5，ｆ＝２．５で−52dB, ｆ＝３で−53dBとなり、
それ以後重量比ｆの増加とともに漸増する。The relationship between the weight ratio f and its receiving sensitivity is
It looks like Figure 3 . As shown in this result, the forced vibration mode is f = 1 and the receiving sensitivity is -64 dB.
It sharply rises to -55 dB at 1.5, becomes -53.5 at f = 2, becomes -52 dB at f = 2.5, and becomes -53 dB at f = 3.
After that, it gradually increases as the weight ratio f increases.
【００２５】かかる結果を総合すれば、重量比ｆ＝２以
上に設定すると、その送受波器の性能は良好となること
が示された。そこで、When the weight ratio f = 2 or more is set together, the results show that the performance of the transducer is good. Therefore,
【００２６】ａ）前記強制振動モードによって振動する
周波数領域に最適に適用できる構成とするために、取付
部Ｃにより、基台１の中心から0.40Ｄ〜0.45Ｄ（Ｄ；基
台１の直径）の位置で、該基台の周辺から支持する。A) 0.40 D to 0.45 D ( D ; diameter of the base 1) from the center of the base 1 by the mounting portion C so that the structure can be optimally applied to the frequency range vibrating in the forced vibration mode. At the position of, support from around the base.
【００２７】ｂ）かかる支持形態において、その送信音
圧及び受信感度を最良とするように、前記ベース部の重
さＭ1 と、ケース部の重さＭ2 との比ｆ（＝Ｍ1 ／Ｍ
2 ）を２以上とする。B) In such a support mode, the ratio f (= M 1 / M 2) of the weight M 1 of the base portion and the weight M 2 of the case portion is optimized so that the transmission sound pressure and the reception sensitivity are optimized. M
2 ) is 2 or more.
【００２８】しかして、上記条件ａ，ｂに基づき、本考
案を構成したものである。The present invention is constructed based on the above conditions a and b.
【００２９】[0029]
【考案の効果】本考案は、上述したように、前記強制振
動モードによって振動する周波数領域に最適に適用でき
るように、ベース部Ａの重さＭ1 と、ケース部Ｂの重さ
Ｍ2 との重量比ｆを２以上として、送受波器の送信音圧
及び受信感度を最良とした。そして一方では、前記強制
振動モードの節の位置で、取付部Ｃにより基台を、その
周辺から支持して、その取付部Ｃと送受波器間の振動を
絶縁し、送波器として用いた場合の取付部Ｃへの振動漏
洩や、受波器として用いた場合の前記取付部Ｃからの振
動伝搬によるＳ／Ｎ比の低下を阻止するようにした。こ
のため、送信音圧及び受信感度が良好でＳ／Ｎ比の高
い、優れた特性を備えた送受波器を提供し得ることとな
る優れた効果がある。[Effect of the invention The present invention, as described above, for optimal applied to the frequency domain to the vibration by the forced vibration mode, and the weight M 1 of the base part A, of the case section B weigh M 2 By setting the weight ratio f of 2 to 2 or more, the transmission sound pressure and the reception sensitivity of the transducer are optimized. On the other hand, at the position of the node of the forced vibration mode, the base is supported by the mounting portion C from the periphery thereof, and the vibration between the mounting portion C and the wave transmitter / receiver is insulated and used as a wave transmitter. In this case, the vibration leakage to the mounting portion C and the decrease in the S / N ratio due to the vibration propagation from the mounting portion C when used as a wave receiver are prevented. Therefore, there is an excellent effect that it is possible to provide a transducer having excellent characteristics such that the transmission sound pressure and the reception sensitivity are good and the S / N ratio is high.
【図１】 本考案の送受波器の一例を示す縦断側面図で
ある。FIG. 1 is a vertical sectional side view showing an example of a transceiver according to the present invention.
【図２】 重量比ｆと送信音圧との関係を示すグラフで
ある。FIG. 2 is a graph showing the relationship between weight ratio f and transmitted sound pressure.
【図３】 重量比ｆと受信感度との関係を示すグラフで
ある。FIG. 3 is a graph showing the relationship between the weight ratio f and the reception sensitivity.
Ａ ケース部 Ｂ ベース部 Ｃ 取付部 １ 基台 ４，５ 杆状端子 １０ 金属製ケース １１ 圧電素子 ２０ 支持座 ２１ 螺子 A case part B base part C mounting part 1 base 4, 5 rod-shaped terminal 10 metal case 11 piezoelectric element 20 support seat 21 screw
Claims (1)
るベース部に、金属製ケースの内面に圧電素子を接合し
てなるケース部を密閉状に被着し、前記圧電素子の表裏
面の電極と前記入出力端子とを電気的に接続してなり、
強制振動モードによって振動する周波数領域に適用する
超音波送受波器において、前記ベース部の重さＭ1 と、
ケース部の重さＭ2 との比ｆ（＝Ｍ1 ／Ｍ2 ）を２以上
とし、かつ基台の直径をＤとすると、基台の中心から0.
40Ｄ〜0.45Ｄの強制振動モードの節の位置で、取付部に
より周辺支持してなる超音波送受波器。1. A piezoelectric ceramic element is joined to a base portion, which supports two rod-shaped input / output terminals on a base, and a case portion formed by joining a piezoelectric element to an inner surface of the metal case is hermetically adhered to the piezoelectric element. The electrodes on the front and back surfaces of the element are electrically connected to the input / output terminals,
In the ultrasonic wave transmitter / receiver applied to the frequency region vibrating in the forced vibration mode, the weight M 1 of the base portion,
Assuming that the ratio f (= M 1 / M 2 ) to the weight M 2 of the case is 2 or more and the diameter of the base is D, it is 0 from the center of the base.
An ultrasonic transducer that is supported around the periphery by a mounting part at the node position in the forced vibration mode of 40D to 0.45D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993016997U JPH089995Y2 (en) | 1993-03-11 | 1993-03-11 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993016997U JPH089995Y2 (en) | 1993-03-11 | 1993-03-11 | Ultrasonic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0574098U JPH0574098U (en) | 1993-10-08 |
| JPH089995Y2 true JPH089995Y2 (en) | 1996-03-21 |
Family
ID=11931660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993016997U Expired - Lifetime JPH089995Y2 (en) | 1993-03-11 | 1993-03-11 | Ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089995Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2742349C3 (en) * | 1977-09-20 | 1981-06-25 | Licinvest Ag, Chur | Image viewer |
| JPS59175299A (en) * | 1983-03-24 | 1984-10-04 | Nippon Denso Co Ltd | Ultrasonic wave transceiver |
-
1993
- 1993-03-11 JP JP1993016997U patent/JPH089995Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0574098U (en) | 1993-10-08 |
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