JP5276352B2 - Ultrasonic transducer - Google Patents

Ultrasonic transducer Download PDF

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Publication number
JP5276352B2
JP5276352B2 JP2008111020A JP2008111020A JP5276352B2 JP 5276352 B2 JP5276352 B2 JP 5276352B2 JP 2008111020 A JP2008111020 A JP 2008111020A JP 2008111020 A JP2008111020 A JP 2008111020A JP 5276352 B2 JP5276352 B2 JP 5276352B2
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Prior art keywords
bottomed cylindrical
cylindrical case
ultrasonic transducer
ultrasonic
ultrasonic wave
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JP2009267472A (en
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勲生 吉田
宗昭 松本
文雅 眞金
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Denso Corp
Nippon Ceramic Co Ltd
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Denso Corp
Nippon Ceramic Co Ltd
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  • Transducers For Ultrasonic Waves (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic wave transceiver which causes one body of the ultrasonic wave transceiver to have a plurality of resonant frequencies, detects near and far distances, is inexpensive and has successful appearance in the ultrasonic wave transceiver concerning the conventional embodiments. <P>SOLUTION: In the ultrasonic wave transceiver in which piezoelectric elements are stuck inside of a bottom plane of a cylinder case with a bottom, unimorph vibrators are formed, and which transmits and receives ultrasonic waves by vibration of the unimorph vibrators; a bottom inside of the cylinder case 2a and an open part of the cylinder case with a bottom 2b are fixed using the cylinder cases 2a and 2b whose sizes are different, the piezoelectric elements 1 are stuck outside of the bottom plane of the cylinder case with a bottom 2b, different two resonant frequencies are generated and detection of the near and far distances is performed by one ultrasonic transceiver. <P>COPYRIGHT: (C)2010,JPO&amp;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。
図５に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を表す。図５において、アルミニウム材等からなる有底筒状ケース２aの底面内部に圧電素子１を固着しユニモルフ振動子を形成する。圧電素子１から入出力リード5a、有底筒状ケース２aの側面内側より入出力リード５ｂを半田付け等して取り出す。圧電素子１と有底筒状ケース２aとは、固着面で電気的に接続されている。入出力リード線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２a内に充填する。
従来の実施の形態に関わる超音波送受波器においては、一般的に一つの超音波送受波器で一つの共振周波数により超音波の送受を行っている。遠距離を検知するためには地面等による誤検知をなくすため、指向特性を鋭くする必要があった。指向特性を鋭くするため、近距離については死角が多くなる。従来の実施の形態に関わる超音波送受波器においては、近距離及び遠距離を検知するためには二つの指向特性の違う超音波送受波機を用いる必要があり、見栄えとコストが悪化していた。
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. 5 is a schematic longitudinal sectional view of an ultrasonic transducer according to a conventional embodiment. In FIG. 5, the piezoelectric element 1 is fixed inside the bottom surface of the bottomed cylindrical case 2a made of an aluminum material or the like to form a unimorph vibrator. The input / output lead 5a and the input / output lead 5b are taken out from the piezoelectric element 1 from the inner side surface of the bottomed cylindrical case 2a by soldering or the like. The piezoelectric element 1 and the bottomed cylindrical case 2a are electrically connected by a fixing surface. The input / output lead wires 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 a silicone foam or the like is placed on the upper surface of the piezoelectric element 1, and a sealing agent 4 made of an elastic material such as a silicone material or a urethane material is further filled into the bottomed cylindrical case 2a.
In the ultrasonic transducer according to the conventional embodiment, ultrasonic waves are generally transmitted and received at one resonance frequency with one ultrasonic transducer. In order to detect a long distance, it is necessary to sharpen the directivity in order to eliminate erroneous detection due to the ground or the like. In order to sharpen the directivity, blind spots increase at short distances. In the ultrasonic transducer according to the conventional embodiment, it is necessary to use two ultrasonic transducers having different directivity characteristics in order to detect a short distance and a long distance, and the appearance and cost are deteriorated. It was.
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、一つの超音波送受波器で異なる二つの共振周波数を持たせ、近距離及び遠距離の検知を一つの超音波送受波器で行い、安価で見栄えの良い超音波送受波器を提供する。   The problem we are trying to solve is a small ultrasonic transmitter / receiver, which has two different resonance frequencies in a single ultrasonic transmitter / receiver, and can detect short distances and long distances with a single ultrasonic transmitter / receiver. Provide a good looking 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ユニモルフ振動子を形成し、ユニモルフ振動子の振動によって超音波の送受信を行う超音波送受波器において、大きさの異なる有底筒状ケース２a及び２bを用いて形状の大きい有底筒状ケース２aの底面内部と有底筒状ケース２bの開口部を固着し、有底筒状ケース２bの底面外部に圧電素子１を貼り合せて、異なる二つの共振周波数を発生させ、近距離及び遠距離の検知を一つの超音波送受波器で行う。   A bottomed cylindrical case 2a having a different size in an ultrasonic transducer that forms a unimorph vibrator by bonding a piezoelectric element inside the bottom surface of a bottomed cylindrical case, and transmits and receives ultrasonic waves by the vibration of the unimorph vibrator. And 2b, the inside of the bottom surface of the bottomed cylindrical case 2a having a large shape and the opening of the bottomed cylindrical case 2b are fixed, and the piezoelectric element 1 is bonded to the outside of the bottom surface of the bottomed cylindrical case 2b. Two resonance frequencies are generated, and a short distance and a long distance are detected by one ultrasonic transducer.

本発明は、超音波送受波器において近距離、遠距離を検知するため、従来二つの超音波送受波器を装着したいたものを一つの超音波送受波器で異なる二つの共振周波数を持たせ、一つの超音波送受波器により近距離、遠距離の検知を行えるという利点を持つ。   In the present invention, in order to detect a short distance and a long distance in an ultrasonic transducer, a conventional ultrasonic transducer is provided with two different resonance frequencies. , It has the advantage of being able to detect near and far distances with a single ultrasonic transducer.

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、遠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 a long distance to a short distance can be realized with high reliability without malfunction.

図１に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において、アルミニウム材等からなる有底筒状ケース２a内部にアルミケース材等からなる有底筒状ケース２ｂの開口部を固着し、有底筒状ケース２ｂの底面外部に圧電素子１を貼り合せ、異なる二つの共振周波数を発生させる。有底筒状ケース２aと２ｂの空間７はシリコーン材、ウレタン材等の弾性体を充填しても良い。圧電素子１から入出力リード5a、有底筒状ケース２a又は２ｂの側面内側より入出力リード５ｂを半田付け等して取り出す。圧電素子１と有底筒状ケース２a及び２ｂとは、固着面で電気的に接続されている。入出力リード線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内に充填する。
図２、３に本発明の別の実施の形態に関わる実施の形態に関わる超音波送受波器の概略縦断面図を示す。
図６は本発明の実施の形態に関わる超音波送受波器および従来の実施の形態に関わる超音波送受波器のインピーダンス特性を表す。図６に示すように従来の実施の形態に関わる超音波送受波器の場合、1次振動モードは単一であるが本発明の超音波送受波器の場合複数の1次振動モードに相当する共振周波数が観察され、その周波数で超音波送受波器を駆動させることが可能となる。
尚、異なる三つ以上の有底筒状ケースを図５のように固着させることによって三つ以上の異なる共振周波数を発生させることも本発明の範囲内にある。 FIG. 1 is a schematic longitudinal sectional view of an ultrasonic transducer according to an embodiment of the present invention. In FIG. 1, an opening of a bottomed cylindrical case 2b made of an aluminum case material or the like is fixed inside a bottomed cylindrical case 2a made of an aluminum material, and the piezoelectric element 1 is placed outside the bottom surface of the bottomed cylindrical case 2b. Bonding and generating two different resonance frequencies. The space 7 of the bottomed cylindrical cases 2a and 2b may be filled with an elastic body such as a silicone material or a urethane material. The input / output lead 5b and the input / output lead 5b are taken out from the piezoelectric element 1 from the inner side surface of the bottomed cylindrical case 2a or 2b by soldering or the like. The piezoelectric element 1 and the bottomed cylindrical cases 2a and 2b are electrically connected by a fixing surface. The input / output lead wires 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 a 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 a silicone material or a urethane material is further filled into the bottomed cylindrical case 2.
2 and 3 are schematic longitudinal sectional views of an ultrasonic transducer according to an embodiment related to another embodiment of the present invention.
FIG. 6 shows impedance characteristics of the ultrasonic transducer according to the embodiment of the present invention and the ultrasonic transducer according to the conventional embodiment. As shown in FIG. 6, the ultrasonic transducer according to the conventional embodiment has a single primary vibration mode, but the ultrasonic transducer of the present invention corresponds to a plurality of primary vibration modes. The resonance frequency is observed, and the ultrasonic transducer can be driven at that frequency.
In addition, it is within the scope of the present invention to generate three or more different resonance frequencies by fixing three or more different bottomed cylindrical cases as shown in FIG.

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.

本発明の実施の形態に関わる有底筒状ケースの概略図Schematic of a bottomed cylindrical case according to an embodiment of the present invention 本発明の別の実施の形態に関わる有底筒状ケースの概略図Schematic of a bottomed cylindrical case according to another embodiment of the present invention 本発明の別の実施の形態に関わる有底筒状ケースの概略図Schematic of a bottomed cylindrical case according to another embodiment of the present invention 本発明の別の実施の形態に関わる有底筒状ケースの概略図Schematic of a bottomed cylindrical case according to another embodiment of the present invention 従来の実施の形態に関わる有底筒状ケースの概略図Schematic of a bottomed cylindrical case according to a conventional embodiment 本発明の実施の形態に関わる超音波送受波器のインピーダンス特性Impedance characteristics of ultrasonic transducers according to embodiments of the present invention

符号の説明Explanation of symbols

１ 圧電素子
２a 有底筒状ケース
２b 有底筒状ケース
２c 有底筒状ケース
３ 吸音材
４ 封止剤
５ａ 入出力リード
５ｂ 入出力リード
６ ＰＶＣ被覆ワイヤ付きコネクタ
７ 空間 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2a Bottomed cylindrical case 2b Bottomed cylindrical case 2c Bottomed cylindrical case 3 Sound-absorbing material 4 Sealant 5a Input / output lead 5b Input / output lead
6 Connector with PVC coated wire 7 Space

Claims (1)

有底筒状ケースの底面に圧電素子を貼り合わせユニモルフ振動子を形成し、ユニモルフ振動子の振動によって超音波の送受信を行う超音波送受波器において、大きさの異なる有底筒状ケース２a及び２bを用いて形状の大きい有底筒状ケース２aの底面内部と有底筒状ケース２bの開口部を固着し、有底筒状ケース２bの底面外部に圧電素子１を貼り合せて、異なる二つの共振周波数を発生させることを特徴とする超音波送受波器。 The bottom surface of the bottomed cylindrical case bonded to the piezoelectric element to form a unimorph vibrators, the ultrasonic transducer for transmitting and receiving ultrasonic waves by the vibration of the unimorph transducer, different sizes bottomed cylindrical case 2a And 2b are used to fix the inside of the bottomed cylindrical case 2a having a large shape and the opening of the bottomed cylindrical case 2b, and the piezoelectric element 1 is attached to the outside of the bottom of the bottomed cylindrical case 2b. 2. An ultrasonic transducer characterized by generating two resonance frequencies.
JP2008111020A 2008-04-22 2008-04-22 Ultrasonic transducer Expired - Fee Related JP5276352B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5414427B2 (en) * 2009-09-02 2014-02-12 日本セラミック株式会社 Ultrasonic transceiver
JP5537321B2 (en) * 2010-07-28 2014-07-02 日本セラミック株式会社 Ultrasonic transceiver
JP7413870B2 (en) 2020-03-20 2024-01-16 株式会社Soken Ultrasonic sensors, object detection devices, and object detection programs
CN114578363B (en) * 2022-03-04 2023-10-13 苏州优达斯汽车科技有限公司 Ultrasonic detection system and method

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JPS6429199A (en) * 1987-07-24 1989-01-31 Matsushita Electric Ind Co Ltd Ultrasonic ceramic microphone

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