JP2006345271A - Ultrasonic wave transceiver - Google Patents

Ultrasonic wave transceiver Download PDF

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JP2006345271A
JP2006345271A JP2005169530A JP2005169530A JP2006345271A JP 2006345271 A JP2006345271 A JP 2006345271A JP 2005169530 A JP2005169530 A JP 2005169530A JP 2005169530 A JP2005169530 A JP 2005169530A JP 2006345271 A JP2006345271 A JP 2006345271A
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bottomed cylindrical
cylindrical case
ultrasonic transducer
case
piezoelectric element
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Isao Yoshida
勲生 吉田
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Nippon Ceramic Co Ltd
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Nippon Ceramic Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic wave transceiver capable of preventing misdetection due to ground or the like in the case of detecting a longer distance as compared with a conventional case. <P>SOLUTION: In the ultrasonic wave transceiver constituting a unimorph vibrator of sticking a piezoelectric element to the inside of a bottom of a bottomed cylindrical case on which a ditch having comparatively longer width B in one direction and comparatively shorter width A in the other direction is formed and transmitting/receiving ultrasonic waves on the outer surface of the case of the vibrator, an aperture part whose size does not exceed the width A is formed on the comparatively shorter side side-face of the bottomed cylindrical case, so that directivity is more narrowed as compared with a conventional apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、超音波周波数帯の送信、受信を行う超音波送受波器に関するものである。   The present invention relates to an ultrasonic transducer that transmits and receives an ultrasonic frequency band.

従来の実施の形態に関わる超音波送受波器において、これを車のバンパー等に埋め込み設置し、周辺の障害物を検出する場合、超音波送受波器にパルスバースト電気信号を入力することで超音波送受波器からその入力パルスバースト電気信号に応じた超音波信号が発振され、発振された超音波信号は障害物に到達した後、その障害物で反射し、超音波信号の一部は同じ超音波送受波器に戻ってくる。超音波送受波器はその反射信号を受信することで障害物を検出している。
従来の実施の形態に関わる超音波送受波器において、図３−bにその概略縦断面図を表す。図３−aは従来の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図および縦断面図を表す。図３−bにおいて、アルミニウム材等から成る有底筒状ケース２の底面内部に圧電素子１を接着しユニモルフ振動子を構成する。圧電素子１の有底筒状ケース２との接着面側の反対面から入出力リード５a、有底筒状ケース２から入出力リード５ｂを半田付け等して取り出す。圧電素子１の有底筒状ケース２との接着面側と有底筒状ケース２とは電気的に接続されており、更に圧電素子１と入出力リード５a及び、有底筒状ケース２と入出力リード５ｂは電気的に接続されている。入出力リード５ａおよび５ｂはＰＶＣ被覆ワイヤ付きコネクタ６のワイヤにそれぞれ半田付けされている。圧電素子１の上面にシリコーン発泡体等から成る吸音材３を設置し、更にその上からシリコーン材、ウレタン材等の弾性体から成る封止剤４を有底筒状ケース２内に充填して構成されている。
従来の実施の形態に関わる超音波送受波器においては、一般的に周波数が同一の場合、振動体を構成する底面の面積が大きくなると、狭指向特性を示し、振動体を構成する底面の面積が同一の場合、振動体の周波数が高くなると狭指向性を示す。よって空中伝搬が良い２０〜７０kHz帯の防滴型超音波センサにおいて、小型で狭指向特性を有する防滴型超音波センサを製作するには難があった。
谷腰欣司著 「超音波とその使い方−超音波送受波器・超音波モータ」 日刊工業新聞 １９９４年 In an ultrasonic transducer according to a conventional embodiment, when this is embedded in a car bumper or the like and an obstacle around it is detected, the pulse transducer electric signal is input to the ultrasonic transducer to generate an ultrasonic wave. An ultrasonic signal corresponding to the input pulse burst electric signal is oscillated from the sonic transducer, and the oscillated ultrasonic signal is reflected by the obstacle after reaching the obstacle, and part of the ultrasonic signal is the same Return to the ultrasonic transducer. The ultrasonic transducer detects an obstacle by receiving the reflected signal.
FIG. 3B shows a schematic longitudinal sectional view of an ultrasonic transducer according to a conventional embodiment. FIG. 3A shows a schematic top view and a longitudinal sectional view of a bottomed cylindrical case in the ultrasonic transducer according to the conventional embodiment. In FIG. 3B, the piezoelectric element 1 is bonded to the inside of the bottom surface of the bottomed cylindrical case 2 made of an aluminum material or the like to form a unimorph vibrator. The input / output leads 5a are taken out from the surface opposite to the bonding surface of the piezoelectric element 1 with the bottomed cylindrical case 2, and the input / output leads 5b are taken out from the bottomed cylindrical case 2 by soldering or the like. The adhesive surface side of the piezoelectric element 1 with the bottomed cylindrical case 2 and the bottomed cylindrical case 2 are electrically connected. Further, the piezoelectric element 1, the input / output lead 5a, and the bottomed cylindrical case 2 The input / output lead 5b is electrically connected. The input / output leads 5a and 5b are soldered to the wires of the connector 6 with the PVC coated wire, respectively. A sound absorbing material 3 made of silicone foam or the like is installed on the upper surface of the piezoelectric element 1, and a sealing agent 4 made of an elastic material such as silicone material or urethane material is filled into the bottomed cylindrical case 2 from above. It is configured.
In the ultrasonic transducer according to the conventional embodiment, generally, when the frequency is the same, when the area of the bottom surface constituting the vibrating body is increased, the area of the bottom surface constituting the vibrating body exhibits narrow directivity characteristics. When the frequency of the vibrating body increases, narrow directivity is exhibited. Therefore, in a drip-proof ultrasonic sensor in the 20 to 70 kHz band with good air propagation, it has been difficult to manufacture a drip-proof ultrasonic sensor having a small size and narrow directivity.
Tanikoshi Shinji “Ultrasound and its usage-Ultrasonic transducers and ultrasonic motors” Nikkan Kogyo Shimbun 1994

解決しようとしている課題は小型超音波送受波器において、指向性を改善する事である。   The problem to be solved is to improve the directivity in a small ultrasonic transducer.

有底筒状ケースの底面内部に圧電素子を貼り合わせてユニモルフ振動子を構成し、この振動体のケース外側面にて超音波の送信、受信を行う超音波送受波器において、有底筒状ケースの側壁に開口部を設けることにより、指向性を従来よりも狭くする。   A unimorph vibrator is constructed by laminating a piezoelectric element inside the bottom surface of a bottomed cylindrical case, and an ultrasonic transducer that transmits and receives ultrasonic waves on the outer surface of the case has a bottomed cylindrical shape. By providing an opening in the side wall of the case, the directivity is made narrower than before.

本発明は、小型超音波送受波器においても送信、受信する指向特性を従来より狭くする事で、従来より長距離を検知する場合の地面等による誤検知を防ぐことが出来るという利点を持つ。また、これにより正面感度も増加し、より長距離を検知出来るようになる。   The present invention has an advantage that it is possible to prevent erroneous detection due to the ground or the like when detecting a long distance as compared with the prior art by narrowing the directivity characteristics for transmission and reception even in a small ultrasonic transducer. This also increases the frontal sensitivity and makes it possible to detect longer distances.

車載用コーナーセンサ等に用いる際、バンパー等に埋め込み設置し、長距離から近距離まで安定した障害物検知を誤作動無く高い信頼性で実現出来る。   When used in in-vehicle corner sensors, etc., it can be embedded in a bumper, etc., and stable obstacle detection from long distances to short distances can be realized with high reliability without malfunction.

図１−bは本発明の実施の形態に関わる超音波送受波器の概略縦断面図を表す。図１−aは本発明の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図および縦断面図、図２−a及び図２−bは本発明の別の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図および縦断面図を表す。図１−aにおいて、アルミニウム材等から成る有底筒状ケース２の側壁に開口部を設ける。尚、図２−aの様に開口部はアルミニウム材等から成る有底筒状ケース２の底面から離れていても良く、また開口部は図２−bの様にケース上面まで完全に達していても良い。開口部圧電素子１の有底筒状ケース２との接着面側の反対面と圧電素子１から入出力リード５a、又、有底筒状ケース２から入出力リード５ｂを半田付け等によって取り出す。圧電素子１の有底筒状ケース２との接着面側と有底筒状ケース２とは電気的に接続されており、更に、圧電素子１と入出力リード５a及び、有底筒状ケース２と入出力リード５ｂとは電気的に接続されている。圧電素子１の上面に発泡シリコーン等から成る吸音材３を載置して、その上からシリコーン材、ウレタン材等から成る封止剤４を有底筒状ケース２内部に充填し構成す る。
例えば、送受信周波数６０ｋHzにおいて、従来の実施の形態に関わる超音波送受波器の振動の節は図４−aのようになり、振動の節は有底筒状ケース２の外径より大きくする事は出来ない。有底筒状ケース側面に開口部を設けることにより、振動の節は図４−bに示すように有底筒状ケースの外径より大きくなる様な仮想の楕円形の振動の節が出来る。その結果、図５−aに示すように鉛直方向に半減全角で３６度だった物が、有底筒状ケース側面に開口部を設けることにより、図５−bに示すように半減全角で19度と１5度以上改善する事が可能となる。楕円形の振動の節の短軸方向は従来の実施の形態と同等のため、指向特性の異方性をより強くする事が出来る。また、正面感度も図６のように増加する。
尚、今回の発明においては開口部はすべてシリコーン材、ウレタン材等柔軟性充填材を充填しておく必要がある。さもないと水等の浸入により劣化する危険がある。ただし、シリコーン等を充填しても今回の超音波送受波器の特性に変化は無い。 FIG. 1B is a schematic longitudinal sectional view of an ultrasonic transducer according to an embodiment of the present invention. 1A is a schematic top view and a longitudinal sectional view of a bottomed cylindrical case in an ultrasonic transducer according to an embodiment of the present invention, and FIGS. 2-A and 2-B are diagrams illustrating another embodiment of the present invention. The schematic top view and longitudinal cross-sectional view of a bottomed cylindrical case in the ultrasonic transmitter / receiver concerning a form are represented. 1A, an opening is provided on the side wall of the bottomed cylindrical case 2 made of an aluminum material or the like. The opening may be separated from the bottom surface of the bottomed cylindrical case 2 made of an aluminum material or the like as shown in FIG. 2-a, and the opening completely reaches the upper surface of the case as shown in FIG. 2-b. May be. The input / output lead 5a from the piezoelectric element 1 and the opposite surface of the opening portion of the piezoelectric element 1 to the bottomed cylindrical case 2 and the input / output lead 5b from the piezoelectric element 1 are taken out by soldering or the like. The adhesive surface side of the piezoelectric element 1 with the bottomed cylindrical case 2 and the bottomed cylindrical case 2 are electrically connected. Further, the piezoelectric element 1, the input / output lead 5a, and the bottomed cylindrical case 2 are electrically connected. And the input / output lead 5b are electrically connected. A sound absorbing material 3 made of foamed silicone or the like is placed on the upper surface of the piezoelectric element 1, and a sealing agent 4 made of silicone material, urethane material or the like is filled into the bottomed cylindrical case 2 from above.
For example, at a transmission / reception frequency of 60 kHz, the vibration node of the ultrasonic transducer according to the conventional embodiment is as shown in FIG. 4-a, and the vibration node is larger than the outer diameter of the bottomed cylindrical case 2. I can't. By providing the opening on the side surface of the bottomed cylindrical case, a virtual elliptical vibration node in which the vibration node is larger than the outer diameter of the bottomed cylindrical case as shown in FIG. As a result, as shown in FIG. 5-a, the half-full angle of 36 degrees in the vertical direction is provided with an opening on the side surface of the bottomed cylindrical case. It will be possible to improve more than 15 degrees. Since the minor axis direction of the elliptical vibration node is the same as that of the conventional embodiment, the anisotropy of the directivity can be further increased. Also, the front sensitivity increases as shown in FIG.
In the present invention, all openings need to be filled with a flexible filler such as a silicone material or a urethane material. Otherwise, there is a risk of deterioration due to intrusion of water or the like. However, even if silicone or the like is filled, there is no change in the characteristics of the ultrasonic transducer this time.

本発明は、車のバックセンサのみならず、防滴型超音波送受波器が利用されている様々な分野に適用できる。   The present invention can be applied not only to a back sensor of a car but also to various fields where a drip-proof ultrasonic transducer is used.

ａ本発明の実施の形態に関わる超音波送受波器の概略縦断面図 ｂ本発明の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図及び縦断面図a Schematic longitudinal sectional view of an ultrasonic transducer according to the embodiment of the present invention b Schematic top view and longitudinal sectional view of a bottomed cylindrical case in the ultrasonic transducer according to the embodiment of the present invention ａ本発明の別の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図及び縦断面図 ｂ本発明の別の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図及び縦断面図a. Schematic top view and longitudinal sectional view of a bottomed cylindrical case in an ultrasonic transducer according to another embodiment of the present invention. b. Bottomed tube in an ultrasonic transducer according to another embodiment of the present invention. Schematic top view and longitudinal sectional view of a case ａ従来の実施の形態に関わる超音波送受波器の概略縦断面図 ｂ従来の実施の形態に関わる超音波送受波器における有底筒状ケースの概略上面図及び縦断面図a Schematic longitudinal sectional view of an ultrasonic transducer according to a conventional embodiment b Schematic top view and longitudinal sectional view of a bottomed cylindrical case in an ultrasonic transducer according to a conventional embodiment ａ従来の実施の形態に関わる超音波送受波器の振動の節 ｂ本発明の実施の形態に関わる超音波送受波器の振動の節a) Node of vibration of ultrasonic transducer according to the conventional embodiment b. Node of vibration of ultrasonic transducer according to the embodiment of the present invention ａ従来の実施の形態に関わる超音波送受波器の指向特性 ｂ本発明の実施の形態に関わる超音波送受波器の指向特性a Directivity characteristics of an ultrasonic transducer according to a conventional embodiment b Directivity characteristics of an ultrasonic transducer according to an embodiment of the present invention 従来の実施の形態に関わる超音波送受波器と本発明の実施の形態に関わる超音波送受波器の反射感度Reflection sensitivity of the ultrasonic transducer according to the conventional embodiment and the ultrasonic transducer according to the embodiment of the present invention

符号の説明Explanation of symbols

１ 圧電素子
２ 有底筒状ケース
３ 吸音材
４ 封止剤
５ ａ入出力リード
５ ｂ入出力リード
６ ＰＶＣ被覆ワイヤ付きコネクタ
DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Bottomed cylindrical case 3 Sound-absorbing material 4 Sealant 5 a Input / output lead 5 b Input / output lead
6 Connector with PVC coated wire

Claims (1)

一方向で比較的長くB、別な方向で比較的短くAなる様な掘り込みを設けた有底筒状ケースの底面内部に圧電素子を貼り合わせてユニモルフ振動子を構成し、この振動体のケース外側面にて超音波の送信、受信を行う超音波送受波器において、有底筒状ケースの比較的短い側の側面にAの幅を超えない様な開口部を設けたことを特徴とする超音波送受波器。 A unimorph vibrator is constructed by laminating a piezoelectric element inside the bottom of a bottomed cylindrical case that has been dug so that it is relatively long B in one direction and relatively short A in another direction. In the ultrasonic transducer that transmits and receives ultrasonic waves on the outer surface of the case, an opening that does not exceed the width of A is provided on the relatively short side surface of the bottomed cylindrical case. An ultrasonic transducer.
JP2005169530A 2005-06-09 2005-06-09 Ultrasonic wave transceiver Pending JP2006345271A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009094845A (en) * 2007-10-10 2009-04-30 Nippon Ceramic Co Ltd Ultrasonic-wave transmitting/receiving apparatus
JP2009141451A (en) * 2007-12-04 2009-06-25 Nippon Ceramic Co Ltd Ultrasonic wave transceiver
JP2010263380A (en) * 2009-05-01 2010-11-18 Nippon Ceramic Co Ltd Ultrasonic wave transceiver
WO2011067835A1 (en) * 2009-12-02 2011-06-09 三菱電機株式会社 Airborne ultrasonic sensor
JP2012060358A (en) * 2010-09-08 2012-03-22 Nippon Ceramic Co Ltd Aerial ultrasonic wave transceiver
KR101146068B1 (en) * 2010-09-24 2012-05-14 니폰 세라믹 가부시키가이샤 Ultrasonic sensor transmitter-receiver
JP2014027516A (en) * 2012-07-27 2014-02-06 Nippon Ceramic Co Ltd Ultrasound transducer
JPWO2016189812A1 (en) * 2015-05-25 2018-03-15 パナソニックＩｐマネジメント株式会社 Ultrasonic device and ultrasonic sensor using the same
WO2018211589A1 (en) 2017-05-16 2018-11-22 三菱電機株式会社 Ultrasonic sensor device and obstacle detection device

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JP2002262383A (en) * 2000-12-28 2002-09-13 Matsushita Electric Works Ltd Ultrasonic wave vibrator
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JPH10332817A (en) * 1997-05-30 1998-12-18 Denso Corp Ultrasonic vibrator and ultrasonic sensor with it
JP2001013239A (en) * 1999-06-30 2001-01-19 Matsushita Electric Works Ltd Ultrasonicvibrator
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009094845A (en) * 2007-10-10 2009-04-30 Nippon Ceramic Co Ltd Ultrasonic-wave transmitting/receiving apparatus
JP2009141451A (en) * 2007-12-04 2009-06-25 Nippon Ceramic Co Ltd Ultrasonic wave transceiver
JP2010263380A (en) * 2009-05-01 2010-11-18 Nippon Ceramic Co Ltd Ultrasonic wave transceiver
WO2011067835A1 (en) * 2009-12-02 2011-06-09 三菱電機株式会社 Airborne ultrasonic sensor
CN102667523A (en) * 2009-12-02 2012-09-12 三菱电机株式会社 Airborne ultrasonic sensor
DE112009005416T5 (en) 2009-12-02 2012-12-13 Mitsubishi Electric Corporation AIR IN THE ULTRASOUND SENSOR
JPWO2011067835A1 (en) * 2009-12-02 2013-04-18 三菱電機株式会社 Aerial ultrasonic sensor
JP2012060358A (en) * 2010-09-08 2012-03-22 Nippon Ceramic Co Ltd Aerial ultrasonic wave transceiver
KR101146068B1 (en) * 2010-09-24 2012-05-14 니폰 세라믹 가부시키가이샤 Ultrasonic sensor transmitter-receiver
JP2014027516A (en) * 2012-07-27 2014-02-06 Nippon Ceramic Co Ltd Ultrasound transducer
JPWO2016189812A1 (en) * 2015-05-25 2018-03-15 パナソニックＩｐマネジメント株式会社 Ultrasonic device and ultrasonic sensor using the same
WO2018211589A1 (en) 2017-05-16 2018-11-22 三菱電機株式会社 Ultrasonic sensor device and obstacle detection device

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