JP2013141174A - Unimorph vibrator and ultrasonic transceiver - Google Patents

Unimorph vibrator and ultrasonic transceiver Download PDF

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JP2013141174A
JP2013141174A JP2012001032A JP2012001032A JP2013141174A JP 2013141174 A JP2013141174 A JP 2013141174A JP 2012001032 A JP2012001032 A JP 2012001032A JP 2012001032 A JP2012001032 A JP 2012001032A JP 2013141174 A JP2013141174 A JP 2013141174A
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piezoelectric element
waveguide plate
adhesive
unimorph
part
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JP5837827B2 (en
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Mikako Kamei
美加子 亀井
Takumi Shigemori
巧 重森
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Nippon Ceramic Co Ltd
日本セラミック株式会社
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Abstract

PROBLEM TO BE SOLVED: To manufacture a unimorph vibrator which is smaller than conventional commercial items by a structure preventing an adhesive from protruding to an element assembly solder part.SOLUTION: According to the invention, a part for releasing a liquid adhesive is provided at an entire periphery of a cutout part of a waveguide plate. Specifically, the entire periphery of the cutout part warps in a direction away from a side that a piezoelectric element is bonded, and thus an extra part of the adhesive in bonding accumulates in a warped portion of the waveguide plate. This structure prevents the extra part of the adhesive from adhering to a soldered portion of the piezoelectric element.

Description

本発明は、圧電素子を用いたユニモルフ振動子およびそれを用いた空中用の超音波送受信器に関するものである。 The present invention relates to a unimorph transducer and ultrasonic transducer for air using the same using a piezoelectric element.

ユニモルフ振動子を使用した製品が多数製造されている。 Products using the unimorph vibrator is a large number production. 例えば、ユニモルフ振動子にコーン状の共振子を取り付けた開放型の超音波送受信器が、自動車のセキュリティー用や、ロボットの距離検知システム用に製造されている。 For example, unimorph vibrators open type ultrasonic transducer fitted with a cone-shaped resonator is, security and for the automobile, is produced for robotic distance detection system. 現在市販されている開放型超音波送受信器は製品の外径がφ10のものが最小である。 Open ultrasonic transceivers that are currently marketed are the outer diameter of the product is minimal those .phi.10. 意匠性を向上させるために、より小型の超音波送受信器が求められている。 In order to improve the design of a small ultrasonic transducer is demanded more.

従来の圧電振動子を用いたユニモルフ振動子は下記の通りである。 Unimorph transducer using a conventional piezoelectric vibrator is as follows. 図2に従来のユニモルフ振動子の構造を示す。 It shows the structure of a conventional unimorph vibrators in FIG. 円盤形の導波板5に、円形または六角形等多角形の圧電素子2が接着されている。 The wave guide 5 of the disc-shaped piezoelectric element 2 of circular or hexagonal or the like polygons are bonded. 例えば圧電素子2は両面に電極が施された円形である。 For example, a piezoelectric element 2 has a circular shape in which the electrodes on both sides was subjected. 導波板5は外周に半円形の切り欠け5aを有する。 Shirubehaban 5 has a semicircular cutout 5a on the outer circumference. 切り欠け5aは、圧電素子2に設けられた銀電極に電極となるリード線4aを半田付けするために設けられている。 Cutout 5a is provided for soldering the lead wires 4a to be an electrode silver electrode provided on the piezoelectric element 2. 導波板2の切り欠け部5aから露出した銀電極にリード線4aが半田付けされている。 Shirubehaban leads 4a silver electrode exposed from the second notches 5a are soldered. 反対側の銀電極中央にリード線4bが半田付けされている。 Leads 4b is soldered to the silver electrode center of the opposite side.

特許公開2002−359896 Patent Publication No. 2002-359896

より小型の開放型超音波送受信器を作成する為には、構造の基本となる圧電振動子と導波板の外径を小さくする必要がある。 To create a smaller open ultrasonic transducer, it is necessary to reduce the outer diameter of the piezoelectric vibrator and the waveguide plate underlying structure. 圧電素子と導波板を小さくした場合、次の問題が生じる。 If you decrease the piezoelectric element and the waveguide plate, the following problem arises. 導波板の径を小さくすると導波板の切りかけ部の面積が狭くなる。 Area of ​​Unfinished portion of the smaller diameter of the waveguide plate waveguide plate becomes narrow. 切りかけ部の面積が狭くなることで、圧電素子と導波板を接着した後に半田付け部まで接着剤がはみ出し易くなる。 Area of ​​Unfinished portion that becomes narrow, easily adhesive sticking to the soldered portion after bonding the piezoelectric element and the waveguide plate. 接着剤が半田付け部まではみ出した場合は、半田付け出来なくなるため不良品となる。 If the adhesive is squeezed out to the soldering portion is comprised of a defective product for which can not be soldered.

両面電極が施された圧電素子と、圧電素子に接着された金属からなる一部が欠けた円盤状の導波板と、圧電素子の導波板が接着されていない側の電極に半田つけされた予備リード線と、圧電素子の電導波板の接着された面の導波板の欠けた部分から露出した圧電素子の電極に半田付けされた予備リード線とからなるユニモルフ振動子において、導波板の欠けた部分の周辺が圧電素子を接着する側と逆方向に反っていることで、接着剤溜まりが出来て接着剤が半田付け部にはみ出すことを抑制する。 A piezoelectric element is double-sided electrode has been subjected, a disk-shaped waveguide plate partially missing comprising an adhesive metal to the piezoelectric element, the wave guide of the piezoelectric element is soldered to the electrode on the side not bonded spare and the lead wires, the unimorph vibrator consisting of a spare leads are soldered to the electrode of the piezoelectric element exposed from glued surface chipped portions of the waveguide plate of conducting wave plate of the piezoelectric element, the waveguide by surrounding missing portion of the plate is warped on the side opposite to the direction of bonding the piezoelectric element, it prevents the adhesive can accumulate adhesive protrudes to the soldering portion.

液状接着剤の這い上がりを防止し、圧電素子への半田付け作業にが容易になった。 To prevent wicking of liquid adhesive, it has facilitated the soldering operation to the piezoelectric element. また接着剤が半田付け部に付着することによる不良が減った。 The defect due to the adhesive adhering to the soldering portion is reduced.

本発明の実施の形態に関わる開放型超音波送受信器の例 Examples of open ultrasonic transducer according to the embodiment of the present invention 従来の開放型超音波送受信器の例 Examples of conventional open-type ultrasonic transducer

図1に本発明を実施した導波板を示す。 It shows a waveguide plate embodying the present invention in FIG. 導波板1は、インバー材からなる。 Shirubehaban 1, consisting of Invar material. 導波板1は、例えば外径φ7mmの薄い円盤形状である。 Shirubehaban 1 is, for example, a thin disk shape having an outer diameter 7 mm in diameter. この導波板1はつぎの形状的特徴をもつ。 Having the shape characteristics of the wave guide 1 Hatsugi. この導波板1は外周部に半円形の欠けた部分1aを有する。 The wave guide 1 has a semi-circular chipped portion 1a on the outer peripheral portion. この欠けた部分1aは、導波板1の外周を中心とした直径φ1.2mmの半円形の切りかけである。 The missing portion 1a is Unfinished semicircular diameter φ1.2mm around the outer periphery of Shirubehaban 1. この切りかけ部1aは、切りかけ部1aの全周が一方へ反っている。 The Unfinished portion 1a, the total circumference of the Unfinished portion 1a is warped to one. 切りかけ部1aの中心からφ1.6mmの部分を始まりとし反り部1bを有す。 The beginning part of φ1.6mm from the center of the Unfinished portion 1a and having a warp section 1b.

この導波板1を使用したユニモルフ振動子の構造をつぎにしめす。 It shows the structure of the unimorph transducer using this waveguide plate 1 below. 前述の導波板1に圧電素子2を接着する。 Bonding the piezoelectric element 2 in the above-mentioned waveguide plate 1. 導波板1の切りかけ部1aが反り返った方向と反対側の面に圧電素子2が接着される。 The piezoelectric element 2 is bonded to the direction Unfinished portion 1a is warped in Shirubehaban 1 on the opposite side. 圧電素子2は、導波板1に内接する薄い正六角形である。 The piezoelectric element 2 is a thin regular hexagon inscribed in Shirubehaban 1. または、円形または多角形でもよい。 Or, it may be circular or polygonal. 圧電素子2の両面には銀電極が施されている。 Silver electrode is subjected to both surfaces of the piezoelectric element 2. 圧電素子2と導波板1が接着剤で接着されている。 The piezoelectric element 2 and the waveguide plate 1 is glued. 圧電素子2と導波板1の中心があうように接着されている。 The center of the piezoelectric element 2 and the waveguide plate 1 is bonded to suit. このとき導波板1の切りかけ部1aから圧電素子2の銀電極の一部が露出している。 Some of the silver electrode of the piezoelectric element 2 is exposed from the case Unfinished portion 1a of the waveguide plate 1. 接着剤は例えば嫌気性アクリル系接着剤が使用できる。 Adhesives for example anaerobic acrylic adhesive can be used. 圧電素子2の両面にリード線4a、4bが半田付けされている。 Leads 4a on both sides of the piezoelectric element 2, 4b are soldered. 導波板1が接着された面は、導波板1の切りかけ部1aから露出した圧電素子2の銀電極部に半田付けされている。 Surface Shirubehaban 1 is bonded is soldered to the silver electrode of the piezoelectric element 2 exposed from the Unfinished portion 1a of Shirubehaban 1. 逆の面では圧電素子2の中央部に半田付けされている。 In the reverse side is soldered to the central portion of the piezoelectric element 2.

圧電素子2と導波板1の接着は例えばつぎのように行われる。 Adhesion of the piezoelectric element 2 and the waveguide plate 1 is carried out as follows, for example. 導波板1の中央部に適量の嫌気性アクリル系接着剤を塗布し、接着剤を塗布した導波板1に圧電素子2を置き加圧する。 The appropriate amount of the anaerobic acrylic adhesive is applied to the central portion of Shirubehaban 1, pressurized position the piezoelectric element 2 in the waveguide plate 1 coated with adhesive. 加圧することで中央部に塗布された接着剤が圧電素子2と導波板1の間の隅々まで広がる。 Adhesive applied to the central portion by pressurizing spreads to every corner between the piezoelectric element 2 and the waveguide plate 1. 導波板1と圧電素子2の間にある接着剤が嫌気反応によって硬化する。 Adhesive is between Shirubehaban 1 and piezoelectric element 2 is cured by anaerobic reaction. (図2に示した)従来の導波板5で有れば、圧電素子2と従来の導波板5を加圧した際に、接着剤が従来の導波板5の切りかけ部5aの露出した圧電素子2の銀電極まではみ出す事がある。 (Shown in FIG. 2) If there in the conventional waveguide plate 5, when the pressurized conventional waveguide plate 5 and the piezoelectric element 2, the adhesive is exposed Unfinished portion 5a of the conventional waveguide plate 5 sometimes protrude to the silver electrode of the piezoelectric element 2 which is. 銀電極まで接着剤がはみ出すと、リード線4aの半田付けが出来なくなる。 When the adhesive until the silver electrode protrudes, can not be soldering of the lead wire 4a. 銀電極まで接着剤がはみ出した場合は、不良として処分される。 Adhesive until the silver electrodes when protruding, are disposed of as defective. 本発明を実施した(図1の)導波板1では、接着剤が切りかけ部1aに設けられた反り部1bにたまる為に、切りかけ部1aに露出した圧電素子2の銀電極へ接着剤がはみ出す事が抑制される。 In the present invention was carried out (FIG. 1) Shirubehaban 1, in order to accumulate the warp portion 1b adhesive is provided on Unfinished portion 1a, the adhesive to the silver electrode of the piezoelectric element 2 exposed to the Unfinished portion 1a it is suppressed that protrudes.

液状接着剤の這い上がりを防止し、圧電素子2への半田付け作業にが容易になった。 To prevent wicking of liquid adhesive, it has facilitated the soldering operation to the piezoelectric element 2. また接着剤が半田付け部に付着することによる不良が減った。 The defect due to the adhesive adhering to the soldering portion is reduced.

本発明を実施した導波板1を使用した超音波送受信器と、従来の導波板5を使用した超音波送受信器で超音波特性の比較を行った。 An ultrasonic transceiver using a waveguide plate 1 embodying the present invention, the comparison of ultrasonic characteristics ultrasonic transceiver using a conventional waveguide plate 5 was carried out. 従来品と変わらない特性が得られた。 Unchanged characteristics were obtained with conventional products.

本発明は、開放型超音波送受信器のみならず、他のユニモルフ振動子にも利用できる。 The present invention is not only open ultrasonic transceiver, it can also be used for other unimorph transducer.

1 金属導波板 1a 金属導波板の切りかけ部 1b 金属導波板の切りかけ部の反り部 2 圧電セラミック振動子 3a 半田 3b 半田 1 Unfinished portion 1b metal waveguide plate metal waveguide plate 1a metal waveguide plate Unfinished section warped portion 2 piezoelectric ceramic vibrators 3a solder 3b solder
4a リード線 4b リード線 4a leads 4b lead

5 従来の導波板 5a 従来の導波板の切りかけ部 5 Unfinished section of the conventional waveguide plate 5a conventional waveguide plate

Claims (2)

  1. 両面電極が施された圧電素子と、 A piezoelectric element is double-sided electrode has been subjected,
    前述圧電素子に接着された金属からなる一部が欠けた円盤状の導波板と、 A disk-shaped wave guide part consisting of the aforementioned piezoelectric element bonded metal was chipped,
    前述圧電素子の前述導波板が接着されていない側の電極に半田つけされたリード線と、 A lead wire above the wave guide of the above piezoelectric element is soldered to the side of the electrode which is not bonded,
    前述圧電素子の前述導波板の接着された面の前述導波板の欠けた部分から露出した前述圧電素子の電極に半田付けされたリード線とからなるユニモルフ振動子において、 In unimorph vibrator consisting of soldered lead wire to the electrode of the aforementioned piezoelectric element exposed from chipped portions of the aforementioned waveguide plate of the bonded surface of the aforementioned wave guide described above the piezoelectric element,
    前述導波板の欠けた部分の周辺が前述圧電素子を接着する側と逆方向に反っていることを特徴とするユニモルフ振動子 Unimorph vibrator around missing portions of the aforementioned waveguide plate, characterized in that the warps to the side opposite to the direction of bonding the above-described piezoelectric element
  2. 前述ユニモルフ振動子を使用した超音波送受信器 Ultrasonic transducer using above unimorph vibrators
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683129A (en) * 1968-09-30 1972-08-08 Philips Corp Electroacoustic transducer having a diaphragm made of at least one layer of piezoelectric material
JPH0327199U (en) * 1989-07-27 1991-03-19
JPH05244692A (en) * 1992-02-28 1993-09-21 Matsushita Electric Works Ltd Ultrasonic microphone
JPH08205288A (en) * 1995-01-23 1996-08-09 Matsushita Electric Ind Co Ltd Piezoelectric vibration body
JP3083308U (en) * 2001-07-10 2002-01-25 美律實業股▲分▼有限公司 Piezoelectric receiving and supplying story unit
JP2002359896A (en) * 2001-05-31 2002-12-13 Nippon Ceramic Co Ltd Ultrasonic wave transducer
US20020196952A1 (en) * 2001-06-25 2002-12-26 Merry Electronics Co., Ltd. Piezoelectric transceiver

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683129A (en) * 1968-09-30 1972-08-08 Philips Corp Electroacoustic transducer having a diaphragm made of at least one layer of piezoelectric material
JPH0327199U (en) * 1989-07-27 1991-03-19
JPH05244692A (en) * 1992-02-28 1993-09-21 Matsushita Electric Works Ltd Ultrasonic microphone
JPH08205288A (en) * 1995-01-23 1996-08-09 Matsushita Electric Ind Co Ltd Piezoelectric vibration body
JP2002359896A (en) * 2001-05-31 2002-12-13 Nippon Ceramic Co Ltd Ultrasonic wave transducer
US20020196952A1 (en) * 2001-06-25 2002-12-26 Merry Electronics Co., Ltd. Piezoelectric transceiver
JP3083308U (en) * 2001-07-10 2002-01-25 美律實業股▲分▼有限公司 Piezoelectric receiving and supplying story unit

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