JP2010278913A

JP2010278913A - Ultrasonic transmitter-receiver

Info

Publication number: JP2010278913A
Application number: JP2009131270A
Authority: JP
Inventors: Yoshiharu Taniguchi; 義晴谷口; Akihiko Tanida; 明彦谷田; Takumi Shigemori; 巧重森; Koji Noguchi; 浩二野口
Original assignee: Nippon Ceramic Co Ltd
Current assignee: Nippon Ceramic Co Ltd
Priority date: 2009-05-29
Filing date: 2009-05-29
Publication date: 2010-12-09

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive ultrasonic transmitter-receiver having two resonance frequencies. <P>SOLUTION: To provide an ultrasonic transmitter-receiver having two different resonance frequencies by providing a projection surrounding the circumference of a piezoelectric element on the bottom face of a bottomed case in an ultrasonic receiver consisting of a bottomed metal or resin case and a piezoelectric element. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、複数の周波数の受信を可能にする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 enables reception of a plurality of frequencies.

従来から、圧電素子を金属または樹脂からなる有底状のケースの底面に貼り付けた構造体からなる超音波送受信装置が広く使用されている。近年では特に、自動車（車両）のバックソナー用としてこれらの超音波送受信器が大量に生産されている。ここで使用される超音波送受信器は、多くの場合、超音波送受信器を構成するケースの固有振動によって超音波を発生させるために、それぞれの超音波送受信器が送受信できる超音波の周波数は特定の１つに限られている。 2. Description of the Related Art Conventionally, an ultrasonic transmission / reception device made of a structure in which a piezoelectric element is attached to the bottom of a bottomed case made of metal or resin has been widely used. In recent years, in particular, these ultrasonic transmitters / receivers have been produced in large quantities for back sonar of automobiles (vehicles). In many cases, the ultrasonic transmitter / receiver used here generates an ultrasonic wave by the natural vibration of the case constituting the ultrasonic transmitter / receiver. It is limited to one.

１つの超音波送受信器で、２つの異なる周波数の超音波を送受信することが出来る超音波送受信器が開発されている。例えば、特許文献１に記載の発明では、有底状ケースの底面に、そのケースの内径よりも小さな外径をもつ有底状ケースの開口部を接着することで、２つの異なる周波数の超音波を送受信することを可能にしている。
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年特許公開２００８−１１１０２０号公報 An ultrasonic transceiver capable of transmitting and receiving two different frequency ultrasonic waves with one ultrasonic transceiver has been developed. For example, in the invention described in Patent Document 1, ultrasonic waves having two different frequencies are bonded to the bottom surface of the bottomed case by bonding an opening of the bottomed case having an outer diameter smaller than the inner diameter of the case. It is possible to send and receive.
Tanikoshi Shinji “Ultrasound and its usage-Ultrasonic transducers and ultrasonic motors” Nikkan Kogyo Shimbun 1994 Japanese Patent Publication No. 2008-111020

特許文献１に記載の超音波送受信器では、２つの周波数で高い音圧の超音波を発生される事を可能にしているが、一方で、形状的な複雑さから、製造コストが大きいという問題が生じる。 In the ultrasonic transmitter / receiver described in Patent Document 1, it is possible to generate ultrasonic waves with high sound pressure at two frequencies. Occurs.

そこで、この発明では、２つこ異なる周波数で共振ピークを持ち、安価に製造が可能な超音波送受信器を実現する事を目的とする。 Accordingly, an object of the present invention is to realize an ultrasonic transceiver that has resonance peaks at two different frequencies and can be manufactured at low cost.

金属または樹脂からなる有底状のケースと圧電素子とからなり、
有底状のケースの底面に圧電素子を接着してなる超音波送受信器において、
有底状のケースの底面に、圧電素子の外周を囲む突起を設けることで、
２つこ異なる周波数で共振ピークを持ち、安価に製造が可能な超音波送受信器を実現する。 It consists of a bottomed case made of metal or resin and a piezoelectric element,
In an ultrasonic transmitter / receiver formed by bonding a piezoelectric element to the bottom of a bottomed case,
By providing a protrusion surrounding the outer periphery of the piezoelectric element on the bottom surface of the bottomed case,
An ultrasonic transmitter / receiver that has resonance peaks at two different frequencies and can be manufactured at low cost is realized.

Practical example

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。φ１４の外径を持つ有底筒状ケース２の底面に、圧電素子１が接着剤によって接着されている。有底筒状ケースの底面には圧電素子の外周を囲む位置に、高さ１．６ｍｍ、幅０．５ｍｍの壁状の突起３が設けられている。ケースは切削によって突起部が出来るように加工されている。圧電素子１から入出力リード５ａ、有底筒状ケース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２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の上面には吸音材４が設置されている。 FIG. 1 is a schematic longitudinal sectional view of an ultrasonic transducer according to an embodiment of the present invention. The piezoelectric element 1 is adhered to the bottom surface of the bottomed cylindrical case 2 having an outer diameter of φ14 with an adhesive. A wall-shaped protrusion 3 having a height of 1.6 mm and a width of 0.5 mm is provided on the bottom surface of the bottomed cylindrical case at a position surrounding the outer periphery of the piezoelectric element. The case is machined so that a protrusion is formed by cutting. 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 by soldering or the like. The piezoelectric element 1 and the bottomed cylindrical case 2 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 4 is installed on the upper surface of the piezoelectric element 1.

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

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

Claims

It consists of a bottomed case made of metal or resin and a piezoelectric element,
In an ultrasonic transmitter / receiver formed by bonding a piezoelectric element to the bottom of a bottomed case,
An ultrasonic transceiver characterized in that a protrusion surrounding the outer periphery of the piezoelectric element is provided on the bottom of the bottomed case.