JP3996542B2

JP3996542B2 - Connection structure between electrodes and sensor using the connection structure

Info

Publication number: JP3996542B2
Application number: JP2003129655A
Authority: JP
Inventors: 慎木内; 秀昭佐藤; 敏生小川
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2003-05-08
Filing date: 2003-05-08
Publication date: 2007-10-24
Anticipated expiration: 2023-05-08
Also published as: JP2004333297A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば振動センサ等の内部における電極間の接続構造に係わり、特に、前記センサ等の小型化においても、簡単な構造で前記電極間の良好な接続構造を可能とする電極間の接続構造及びそれを用いたセンサに関する。
【０００２】
【従来の技術】
下記に示す特許文献１には傾斜角センサに関する発明が開示されている。特許文献１に記載された傾斜角センサには、弾性を有する板バネの自由端に錘が設けられ、さらに前記板バネ上には絶縁膜を介して電極部及び抵抗膜が印刷焼成によって形成されている。
【０００３】
特許文献１では、前記板バネの自由端と反対側の端部が、ちょうど前記電極部上に設けられた固定板と、ケース内部に設けられた板バネ用支持部との間に挟み込まれ、前記固定板に設けられたねじ穴からねじを前記板バネ用支持部方向に向けて締め付けることで前記板バネを前記ケース内部取り付けている。
【０００４】
特許文献１に示す傾斜角センサは、前記ケースを前記板バネが撓む方向に傾けると、前記板バネに設けられた抵抗膜の抵抗値が傾斜角の変化によって変化し、この抵抗値の変化を測定することで前記傾斜角を検出できるようになっている。
【０００５】
【特許文献１】
実開昭６１―１６１７０６号公報
【０００６】
【発明が解決しようとする課題】
ところで傾斜角センサなど電子機器等の内部に搭載されるセンサは、前記電子機器等自体の小型化によって、より小型化されることが要求されている。
【０００７】
そしてその小型化にあっては、電極部の配線構造を簡単な構造にでき、また前記電極部に強い押圧力等が加わることによる前記電極部の破損を抑制することが重要である。
【０００８】
しかしながら特許文献１に記載されたセンサでは、前記電極部にリード線が半田付けされて外部に引き延ばされた構成であるから、小型化につれて前記電極部にリード線を半田付けすることは非常に煩雑な作業となる。
【０００９】
また特許文献１に記載されたセンサでは上記のように、板バネを、前記電極部上に設けられた固定板と、ケース内部に設けられた板バネ用支持部との間に挟み込み、前記固定板を板バネ支持部にねじ止めすることにより前記板バネをケース内に支持固定する構成であるため、ねじ止めによって前記固定部から前記電極部に強い締め付け力が作用すると前記電極部が破損するといった問題が生じやすい。一方、前記締め付け力が弱いと前記板ばねが振動するにつれて、前記板ばねがケース内部で位置ずれを起こしやすくなる。
【００１０】
そこで本発明は上記従来の課題を解決するためのものであり、特に小型化を実現するために、簡単な構造で且つ電極間の良好な接続構造を可能とする電極間の接続構造及びそれを用いたセンサを提供することを目的としている。
【００１１】
【課題を解決するための手段】
本発明における電極間の接続構造は、電極部が設けられた基板と、前記電極部と対向する位置に突出する接続電極部が設けられた第１部材と、前記基板と第１部材間に介在するとともに、前記接続電極部が貫通する穴部が設けられた第１弾性部材と、を有し、
前記基板の電極部が設けられた面と反対側の面には第２部材が設けられ、前記第１部材と第２部材間の接合により前記接続電極部が前記第１弾性部材に形成された穴部を介して前記電極部と導通接続することを特徴とするものである。
【００１２】
上記発明では、従来のように電極部にリード線等を半田付けするものではなく、基板に設けられた電極部と、前記電極部と面対向する位置に接続電極部が設けられた第１部材と、前記接続電極部を通す穴部が設けられた第１弾性部材とを設け、前記接続電極部を前記第１弾性部材に形成された穴部を介して、前記電極部と導通接続させることで、従来に比べて簡単な構造で電極部の接続構造を形成できるとともに、弾性部材による弾性力によって前記電極部と接続電極部間の押圧力が適度に緩和され、前記電極部と接続電極部との破損を防止できるとともに良好な導通接続状態を維持できる。
【００１３】
また本発明では、前記基板の電極部が設けられた面と反対側の面と、第２部材間に第２弾性部材が設けられることが、前記電極部と接続電極部間の押圧力をより適度な大きさに緩和できるとともに、良好な導通接続状態を維持できて好ましい。
【００１４】
また本発明では、前記第２弾性部材の前記基板に形成された電極部と対向する位置には、前記電極部方向に突き出す突出部が設けられ、前記第１部材と第２部材との接合により前記突出部が前記電極部を前記接続電極部方向に押圧することが、より効果的に前記電極部と接続電極部間を良好な導通接続状態に維持できて好ましい。
【００１５】
また本発明では、前記第１弾性部材の厚さは、前記第１部材の表面から突出する接続電極部の高さよりも大きいことが好ましい。
【００１６】
また本発明では、上記いずれかの電極間の接続構造を用いたセンサにおいて、
前記基板は弾性力を有する板ばね部材で、前記板ばね部材の自由端側に錘が取り付けられ、前記板ばね部材の固定端側に、前記電極部が形成され、
前記第１部材は第１ケース、第２部材は第２ケースであり、前記板ばね部材に取り付けられた錘が、前記第１ケースと第２ケース間に形成された空間内に位置し、前記板ばね部材の電極部が、前記第１ケースの表面から突出した接続電極部と第１弾性部材を介して導通接続されるとともに前記板ばね部材の固定端が前記第１ケース及び第２ケース間に挟持されて支持固定されることを特徴とするものである。
【００１７】
上記の構成では、簡単な構造で電極部の接続構造を形成できるとともに、弾性部材による弾性力によって前記電極部と接続電極部間の押圧力が適度に緩和され、前記電極部と接続電極部との破損を防止できるとともに、良好な導通接続状態を維持できる。
【００１８】
また板ばね部材の弾性力によって前記板ばね部材が振動しても、その振動力は前記板ばね部材の固定部側で前記第１弾性部材によって効果的に吸収されるので、前記板ばね部材を接着剤等で固着しなくても板ばね部材と第１部材との間に第１弾性部材を介在させることで前記板ばね部材が位置ずれ等を起こすことはなく、簡単な構造で前記板ばね部材をケース内部に固定支持できる。
【００１９】
また本発明では、前記第１ケースには導電部材がインサート成形されており、前記第１ケースの表面から突出する導電部材が前記接続電極部を構成するとともに、前記導電部材は前記第１ケースの側面から外方に延出し、前記外方に延出した部分が端子部を構成することが好ましい。これにより接続電極部の形成と、前記接続電極部から引き出される端子部の形成を非常に簡単な構造で形成できる。
【００２０】
また本発明では、前記板ばね部材の固定端は、自由端に比べて側方に延びて形成されることが好ましい。これによって前記固定端を広い面積で形成ででき、前記板ばね部材をより確実に前記ケース内に固定支持することが可能である。
【００２１】
また本発明では、前記固定端は、自由端に比べて側方に延びて形成される側方部と、その側方部の端部から前記自由端方向に延びる脚部とで構成されてもよい。
【００２２】
また本発明では、前記第１ケース及び第２ケースは、四方が側壁部で囲まれ、前記接続電極部は前記側壁部の表面から突出し、前記板ばね部材の固定端は、第１ケースと第２ケースの前記側壁部間で挟持されることが、簡単な構造でセンサの電極間の接続構造を形成できて好ましい。
【００２３】
【発明の実施の形態】
図１は本発明におけるセンサ（振動センサ）を各構成部材に分解して示した組立前の振動センサの斜視図、図２は図１に示す各構成部材を組み立てた後の振動センサを、符号２の部材がちょうどII―II線から図示Ｙ―Ｚ平面と平行な方向に切断される位置で切断し、その切断面を矢印方向から見た部分断面図、図３は、図１に示す各構成部材を組み立てた後の振動センサを、符号３の部材がちょうどIII―III線から図示Ｙ―Ｚ平面と平行な方向に切断される位置で切断し、その切断面を矢印方向から見た部分断面図、図４は、図１に示す各構成部材を組み立てた後の振動センサを、符号５の部材がちょうどＩＶ―IＶ線から下方向に切断される位置で切断しその切断面を矢印方向から見た部分断面図、図５は図１に示す符号３の部材を拡大し、且つ符号９の部材を符号３の部材から取り外した状態を示す部分拡大斜視図である。
【００２４】
図１に示す符号１は上ケース（第２ケース）であり、例えばポリエチレン（PE）やポリプロピレン（PP）、ポリフェニレンサルファイド（PPS）等の樹脂で形成された樹脂ケースである。図３に示すように、前記上ケース１は上板７と前記上板７の周囲から前記上板７と一体となって下方に突出する４つの側壁６とで構成される。これによって前記上ケース１には、前記上板７と側壁６とで囲まれた空間部８が形成される。前記側壁６は、さらに内壁部６ａと、前記内壁部６ａよりも外方に位置し、前記内壁部６ａよりも下方に突出する外壁部６ｂとで構成される。
【００２５】
図１に示す符号２はゴム等で形成された弾性部材（第２弾性部材）である。前記弾性部材２は、温度変化による硬度変化の少ないことが重要で、例えばシリコン系ゴムやフッ素系ゴムであることが好ましい。また前記弾性部材２の最大弾性損失周波数（以下、ＭＥＦ）は、使用温度の範囲内のおいて板ばね部材３の弾性部３ａでの自己共振周波数（以下、ＳＲＦ）より大きいことが好ましい。これにより、自己共振周波数での振動を利用するアプリケーションを制限しなくて済む。仮にＭＥＦがＳＲＦより低いと、例えば、センサ出力のＳＲＦをモニタして衝突を検知しようというような用途の場合に、衝撃のエネルギーがゴム弾性体に吸収され、著しく感度が低下する。振動センサ自体が振動吸収のダンパで保持されてしまうことになる。
【００２６】
前記弾性部材２は、中央に四角形状の窓部２ｂを有するように四つの片２ａの端部同士を一体に繋いだ囲み形状である。前記弾性部材２の各片２ａは前記上ケース１のちょうど内壁部６ａの下面に設置される。
【００２７】
図１に示すように前記弾性部材２の図示左側の片２ａには、２つの突出部２ａ１が下方に向けて突出している。同様に図示右側の片２ａには、１つの突出部２ａ１が下方に向けて突出している。これら突出部２ａ１は、次に説明する板ばね部材３に形成された電極部１１，１３とちょうど対向する位置に形成される。
【００２８】
図１に示す符号３は、板ばね部材である。前記板ばね部材３は、弾性変形可能な弾性部３ａと、前記上ケース１と下ケース５間に挟持されて支持固定される固定部３ｂとで構成される。
【００２９】
図５に示すように、前記弾性部３ａの自由端３ａ１には、錘９が取り付けられる。前記錘９には、前記弾性部３ａの自由端３ａ１と対向する位置に挿入孔９ａが設けられており、前記自由端３ａ１が前記挿入孔９ａ内に挿入されることで、前記錘９が前記弾性部３ａの自由端３ａ１に取り付けられるようになっている。
【００３０】
前記錘９は、例えば黄銅であり、重さは例えば２２ｍｇである。
図５に示す板ばね部材３は、有機系絶縁フィルムで形成される。前記有機系絶縁フィルムには、ポリイミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート等の使用温度範囲（例えば−４０℃〜８５℃程度）内において、ガラス転移等の物理的、科学的変性を生じない樹脂フィルムが使用可能であるが、この中でも特にポリイミドで形成された樹脂フィルムを使用することが好ましい。
【００３１】
図５に示すように前記固定部３ｂは、前記板ばね部材３の前記弾性部３ａの基端３ａ２から両側方（図示Ｘ方向）に向けて延出形成された側方部３ｂ１と、前記側方部３ｂ１の両端部から屈曲して前記弾性部３ａの自由端３ａ１方向（図示Ｙ方向）に延びる脚部３ｂ２，３ｂ２とで構成される。
【００３２】
図５に示すように、前記弾性部３ａの下面には、可変抵抗部１０が形成されている。また前記固定部３ｂの図示左側の脚部３ｂ２の下面には、２つの電極部１１，１１と、前記電極部１１，１１間に形成された抵抗部１９が形成されている。また前記固定部３ｂの図示右側の脚部３ｂ２の下面には、１つの電極部１３が形成されている。なお前記抵抗部１９は、板ばね部材３に印刷等によって形成されていなくても良く、センサ外部に設けられていてもよい。図５に示す電極部１１，１３及び抵抗部１９の配置は一例にすぎない。
【００３３】
図５に示すように、図示右側の脚部３ｂ２の下面に形成された電極部１３と、弾性部３ａの下面に形成された可変抵抗部１０とが導通接続されており、また前記可変抵抗部１０と、図示左側の脚部３ｂ２の下面に形成された電極部１１―抵抗部１９―電極部１１とが導通接続されている。
【００３４】
図５に示す前記可変抵抗部１０は例えばカーボン膜である。前記弾性部３ａが弾性変形すると、前記カーボン膜はそれに合わせて伸縮し、これによって前記カーボン膜の抵抗値が変化する。前記伸縮による前記抵抗値の変化量を大きくするには、本発明のようにカーボン膜を使用することが好ましい。
【００３５】
また前記電極部１１，１３は銀膜など導電性に優れ且つ耐腐食性に優れた材質で形成されることが好ましい。また前記抵抗部１９は可変抵抗部１０と同様にカーボン膜等で形成される。
【００３６】
前記可変抵抗部１０，電極部１１，１３及び抵抗部１９は有機系絶縁フィルムで形成された板ばね部材３の下面に直接、印刷成形されたものである。印刷方法は例えばスクリーン印刷法である。
【００３７】
図１に示す符号４は、ゴム等の弾性部材（第１弾性部材）４である。前記弾性部材４は、弾性部材２と同様に、その中央に四角形状の窓部４ｂが形成されるように４つの片４ａの端部同士を一体に繋いだ囲み形状である。前記弾性部材４の各片４ａは前記下ケース５のちょうど内壁部１２ａの上面に設置される。なお前記弾性部材４の材質等は弾性部材２と同じである。
【００３８】
図１に示すように前記弾性部材４の図示左側の片４ａには、２つの穴部４ａ１が形成されている。同様に図示右側の片４ａには、１つの穴部４ａ１が形成されている。これら穴部４ａ１は、次に説明する下ケース５から突出する接続電極部１５，１６と対向する位置に形成され、また前記接続電極部１５，１６を貫通させることが可能な程度の大きさで形成される。
【００３９】
図１に示す符号５は下ケース（第１部材）である。前記下ケース５は上ケース１と同様に例えばポリエチレン（PE）やポリプロピレン（PP）、ポリフェニレンサルファイド（PPS）等の樹脂で形成された樹脂ケースである。図３に示すように、前記下ケース５は底板１４と、前記底板１４の周囲から前記底板１４と一体となって上方に突出する４つの側壁１２とで構成される。これによって前記下ケース５には、前記底板１４と側壁１２とで囲まれた空間部２０が形成される。前記側壁１２は、さらに内壁部１２ａと、前記内壁部１２ａよりも外方に位置し、前記内壁部１２ａよりも上方に突出する外壁部１２ｂとで構成される。
【００４０】
図１に示すように２つの導電部材１７が、ちょうど下ケース５の図示左側の側面５ａから側壁１２内部を通り、前記側壁１２の上面に露出すべく設けられ、また１つの導電部材１８が、ちょうど下ケース５の図示右側の側面５ａから側壁１２内部を通り、前記側壁１２の上面に露出すべく設けられている。
【００４１】
図示左側の側壁１２の上面から突出した導電部材１７の部分は、接続電極部１５，１５を構成し、図示右側の側壁１２の上面から突出した導電部材１８の部分は、接続電極部１６を構成する。これら各接続電極部１５，１６は、前記板ばね部材３の脚部３ｂ２の下面に形成された電極部１１，１３と対向する位置となるように、前記下ケース５の内壁部１２ａの上面から突出形成される。
【００４２】
図１に示すように前記導電部材１７，１８はそれぞれ下ケース５の側面５ａから外方に突出し、その突出した部分がそれぞれ端子部１７ａ，１７ｂ，１８ａを構成している。
【００４３】
前記導電部材１７，１８は下ケース５内部に例えばインサート成形により形成されたものである。
【００４４】
図３に示すように、前記弾性部材２，４の各片２ａ，４ａは、ちょうど上ケース１及び下ケース５の内壁部６ａ，１２ａ間に挟まれる大きさで形成され、また板ばね部材３の固定部３ｂは、上下で対向する弾性部材２，４の各片２ａ，４ａの大きさの範囲内で形成される。このため、前記上ケース１及び下ケース５の外形寸法は、前記弾性部材２，４及び板ばね部材３よりも若干大きくなっている。
【００４５】
図３に示すように、前記上ケース１の外壁部６ｂの下面と下ケース５の外壁部１２ｂの上面とがそれぞれ合わさり、この接合面間に接着剤等が付与されることで前記上ケース１と下ケース５とが接着固定される。例えば前記接着剤は前記上ケース１と下ケース５とを上下に重ねたときの境界部上に塗布することで毛細管作用によって前記接合面間に浸透していく。このとき前記弾性部材２，４上に若干接着剤が及んでいてもよい。
【００４６】
図３に示すように上ケース１及び下ケース５とが接合されると、その内部には、三次元的に囲まれた空間が形成される。図３及び図４に示すようにその空間内には、前記板ばね部材３の弾性部３ａと前記弾性部３ａの自由端３ａ１に取り付けられた錘９が位置し、前記錘９が振動によって上下に振れることで前記弾性部３ａが前記空間内で弾性変形を起こす。
【００４７】
例えば図１に示す端子部１７ａには電源部（図示しない）が接続され、図１に示す端子部１８ａがアースに落とされ、端子部１７ｂが検出部（図示しない）に接続されているとし、電源部での電圧をＶｃｃ、抵抗部１９の抵抗値をＲ、可変抵抗部１０の抵抗値をＲｘ、検出部での電圧をＶｏとすると、式Ｖｏ＝[Ｒｘ／（Ｒｘ＋Ｒ）]Ｖｃｃが成立する。
【００４８】
今、前記錘９が上下に振動し、前記板ばね部材３の弾性部３ａが上下に弾性変形を起こすと前記弾性部３ａの下面に設けられた可変抵抗部１０であるカーボン膜が伸縮することで前記可変抵抗部１０抵抗値Ｒｘが変化し、この結果、電位差ΔＶｏが生じ、これによって前記弾性部３ａの振動状態や傾斜角を検出することが可能になっている。
【００４９】
本発明では上記したように前記板ばね部材３が有機系絶縁フィルムで形成される。この結果、前記板ばね部材３を非常に小さい寸法で形成し、重さの軽い錘９を前記板ばね部材３の弾性部３ａに取り付けても前記弾性部３ａを良好に弾性変形させることが可能である。従って前記板ばね部材３自体の大きさを従来に比べて非常に小さくできる。
【００５０】
図５に示すように、前記板ばね部材３の長さ寸法Ｔ１は、例えば５ｍｍ程度である。また前記板ばね部材３の幅寸法Ｔ２は７ｍｍ程度である。また前記板ばね部材３の弾性部３ａの長さ寸法Ｔ３は２ｍｍ程度で、前記弾性部３ａの幅寸法Ｔ４は１ｍｍ程度である。また前記板ばね部材３の厚みは前記板ばね部材３がポリイミドである場合、０．０７５ｍｍ程度まで薄くできる。
【００５１】
本発明におけるセンサの特徴的部分について以下に説明する。
本発明では、下ケース５に形成された接続電極部１５と、板ばね部材３の脚部３ｂ２に形成された電極部１１，１３との接続構造に特徴点がある。
【００５２】
図２は、図１に示す各構成部材が組立てられて完成したセンサの前記電極の接続構造を示す部分断面図である。
【００５３】
図２に示すように、下ケース５の内壁部１２ａの上面から露出した接続電極部１５（ここでは符号１５の接続電極部の接続構造に関して説明する。なお符号１６の接続電極部の接続構造も全く同じである）は、弾性部材４に形成された穴部４ａ１内を貫通して、前記穴部４ａ１内から露出し、前記接続電極部１５と対向する位置に配置された前記板ばね部材３の脚部３ｂ２の下面に形成された電極部１１と、前記接続電極部１５とが前記弾性部材４の穴部４ａ１を介して当接する。
【００５４】
本発明では、前記板ばね部材３と下ケース５間に弾性部材４を介在させているため、上ケース１と下ケース５とを接合させたときの押圧力で、前記弾性部材４が若干の弾性変形を起こす。この結果、前記板ばね部材３に形成された電極部１１と下ケース５に形成された電極部１５とが極端に強い力によって当接せずに、適度な当接力を受けて前記電極部１１，１５が当接するので、前記電極部１１，１５が破損等することなく、常に良好な導通状態を保つことが可能である。
【００５５】
また本発明のように、下ケース５から前記電極部１１，１３と対向する位置に接続電極部１５，１６を突出形成し、前記弾性部材４を介して、前記電極部１１，１３と前記接続電極部１５，１６とを付き合わせることで、従来のように電極部にリード線を半田付け等によって接続するなどの煩雑な作業が必要なくなり、簡単な構造で電極間の接続構造を実現できる。
【００５６】
よって本発明における電極間の接続構造を用いればセンサ自体の小型化をより効果的に促進させることが可能である。
【００５７】
また本発明におけるセンサは、板ばね部材３の弾性部３ａが振動によって揺れるものであり、この際の振動が前記板ばね部材３の固定部３ｂ方向に伝わっていくが、前記弾性部材４によって前記振動力が緩和されるので、前記電極部１１，１３と接続電極部１５，１６間を半田付け等しなくても弾性部材４を介在させ、上ケース１と下ケース５間を押圧する構造とすることで前記板ばね部材３をしっかりとケース内部に支持固定でき、前記電極間が位置ずれ等を起こすことなく良好な電極間の接続構造を維持できる。
【００５８】
また前記板ばね部材３の前記弾性部３ａが弾性変形した際に生じる応力は、前記弾性部材４によって緩和されるから、前記弾性部３ａの付け根３ａ３，３ａ３部分に前記応力が集中することを抑制できる。このため繰り返し弾性部３ａが振動しても、あるいは前記弾性部３ａが極端に大きく振れた場合でも前記弾性部３ａの付け根３ａ３部分が白色化等による劣化を起こしたり前記弾性部３ａが塑性変形することを抑制でき前記弾性部３ａの劣化を防ぎ耐久性を向上させることが可能になっている。
【００５９】
また本発明では、図１に示すように、上ケース１と板ばね部材３間にも弾性部材２が設けられていることが好ましい。前記板ばね部材３の上下に弾性部材２，４を設けることで、上ケース１と下ケース５間を接合したときに前記電極部１１，１３と接続電極部１５，１６間に作用する押圧力が適度に緩和され、前記電極部１１，１３と接続電極部１５，１６が破損するのをより効果的に防止できるとともに良好な導通接続状態を維持することができる。
【００６０】
また本発明では、図２に示すように、前記弾性部材２には下方に突出する突出部２ａ１が形成され、前記突出部２ａ１は、前記上ケース１と下ケース５とが接合されたときに、下方に押圧力を生じるため、前記突出部２ａ１は、前記板ばね部材３の電極部１１を下方に押し、その結果、前記板ばね部材３の電極部１１と前記下ケース５に形成された電極部１５とがより良好に導通接続された状態になるとともに、接着剤や半田等を用いなくても衝撃等によって前記電極部１１，１５同士が位置ずれを起こすことをより効果的に抑制できる。
【００６１】
なお前記下ケース５の側壁１２の上面から突出する電極部１５の高さは、前記弾性部材４の厚みよりも若干低くなるように調整されている。これによって前記弾性部材４は、下ケース５と上ケース１間を接合させるときに、若干の弾性変形を起こすとともに前記弾性部材２の突出部２ａ１からの適度な押圧力を受けて前記板ばね部材３の電極部１１と前記下ケース５の電極部１５とが良好な導通状態を保つようになる。
【００６２】
また前記板ばね部材３がより好ましくケース内部に固定支持されるようにするには、図５のように、前記板ばね部材３の固定部３ｂを前記弾性部３ａの基端３ａ２から側方に向けて延ばして形成することが好ましい。
【００６３】
その結果、前記固定部３ｂの面積を前記弾性部３ａの面積に比べて大きくすることが可能であり、前記固定部３ｂでしっかりと板ばね部材３をケース内に固定支持できる。
【００６４】
また本発明では、図５に示すように、前記板ばね部材３の固定部３ｂは、前記弾性部３ａの基端３ａ２から側方に向けて延びる側方部３ｂ１と、その側方部３ｂ１の両側端部から前記弾性部３ａの自由端３ａ１方向に向けて延びる脚部３ｂ２とで構成されることが好ましい。前記固定部３ｂに側方部３ｂ１のみならず脚部３ｂ２を設けることで、より前記固定部３ｂの面積を前記弾性部３ａの面積に比べて広げることができ、より安定して前記板ばね部材３を前記ケース内に支持固定することが可能になる。また前記固定部３ｂに脚部３ｂ２を設けることで、この脚部３ｂ２に電極部１１，１３や抵抗部１９を設けることができ、前記電極部１１，１３及び抵抗部１９の形成位置の自由度を広げることができる。
【００６５】
なお本発明では、前記弾性部３ａの基端３ａ２の両側方に向けて固定部３ｂが延びているが、前記基端３ａ２の一方の側方のみに前記固定部３ｂが延出形成されていてもよい。ただし前記弾性部３ａの基端３ａ２の両側方に向けて前記固定部３ｂが延出形成されている方が、より安定して前記板ばね部材３を前記ケース内部に支持固定することが可能である。
【００６６】
また本発明ではケースは、上ケース１と下ケース５とに分割形成されており、前記上ケース１と下ケース５間に、前記弾性部材２，４及び板ばね部材３が挟持されるようになっている。そして前記板ばね部材３の固定部３ｂは、両ケース１，５の内壁部６ａ，１２ａ間に沿って形成されたものであり、前記固定部３ｂが前記弾性部材２，４を介して前記内壁部６ａ，１２ａ間に挟持される構造となっている。このように前記板ばね部材３は、前記上ケース１及び下ケース５間に前記弾性部材２，４を介して挟持されて支持固定されるようになっているから、簡単な構造で板ばね部材をケース内部に支持固定できるとともに、半田や接着剤による固定、あるいはねじ等による固定など煩雑な支持固定構造を使用することが必要なくなる。
【００６７】
なお特に前記板ばね部材３を所定位置に設置するためには、例えば図１に示す下ケース５の側壁部１２から上ケース１方向に向くリブ（図示しない）を設け、弾性部材２，４及び板ばね部材３には、前記リブと対向する位置に穴部を設け、弾性部材２，４及び板ばね部材３を上ケース１及び下ケース５間に挟持するときに、前記穴部内に前記リブを貫通させることで、前記板ばね部材３をより所定位置に設置しやすなる。
【００６８】
上記した本発明におけるセンサは例えば携帯電話などの小型化機器への使用が期待される。
【００６９】
【発明の効果】
以上説明した本発明では、基板（板ばね部材）に設けられた電極部と、前記電極部と面対向する位置に接続電極部が設けられた第１部材（下ケース）と、前記接続電極部を通す穴部が設けられた第１弾性部材とを設け、前記接続電極部を前記第１弾性部材に形成された穴部を介して、前記電極部と導通接続させることで、従来に比べて簡単な構造で電極部の接続構造を形成できるとともに、弾性部材による弾性力によって前記電極部と接続電極部間の押圧力が適度に緩和され、前記電極部と接続電極部との破損を防止できるとともに良好な導通接続状態を維持できる。
【図面の簡単な説明】
【図１】本発明のセンサを各構成部材に分解した分解斜視図、
【図２】図１に示す各構成部材を組み立てた後のセンサを、弾性部材２がちょうどII―II線から図示Ｙ―Ｚ平面と平行な方向に切断される位置で切断し、その切断面を矢印方向から見た部分断面図、
【図３】図１に示す各構成部材を組み立てた後のセンサを、板ばね部材３がちょうどIII―III線から図示Ｙ―Ｚ平面と平行な方向に切断される位置で切断し、その切断面を矢印方向から見た部分断面図、
【図４】図１に示す各構成部材を組み立てた後のセンサを、下ケース５がちょうどＩＶ―IＶ線から下方向に切断される位置で切断しその切断面を矢印方向から見た部分断面図、
【図５】図１に示す板ばね部材３を拡大し、且つ錘９を板ばね部材３から取り外した状態を示す部分拡大斜視図、
【符号の説明】
１上ケース
２、４弾性部材
３板ばね部材
３ａ弾性部
３ｂ固定部
５下ケース
６、１２側壁部
９錘
１０可変抵抗部
１１、１３電極部
１５、２６接続電極部
１７、１８導電部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure between electrodes inside, for example, a vibration sensor, and in particular, a connection between electrodes that enables a good connection structure between the electrodes with a simple structure even in downsizing of the sensor or the like. The present invention relates to a structure and a sensor using the structure.
[0002]
[Prior art]
Patent Document 1 shown below discloses an invention related to a tilt angle sensor. In the tilt angle sensor described in Patent Document 1, a weight is provided at the free end of a plate spring having elasticity, and an electrode portion and a resistance film are formed on the plate spring via an insulating film by printing and baking. ing.
[0003]
In Patent Document 1, the end opposite to the free end of the leaf spring is sandwiched between a fixed plate provided on the electrode portion and a leaf spring support provided inside the case. The plate spring is attached inside the case by tightening a screw from a screw hole provided in the fixing plate toward the support portion for the plate spring.
[0004]
In the tilt angle sensor shown in Patent Document 1, when the case is tilted in the direction in which the leaf spring bends, the resistance value of the resistance film provided on the leaf spring changes due to the change in the tilt angle, and the change in the resistance value. The inclination angle can be detected by measuring.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 61-161706
[0006]
[Problems to be solved by the invention]
By the way, a sensor mounted inside an electronic device or the like such as an inclination angle sensor is required to be further downsized by downsizing the electronic device or the like.
[0007]
In order to reduce the size, it is important to make the wiring structure of the electrode part simple and to prevent the electrode part from being damaged due to a strong pressing force applied to the electrode part.
[0008]
However, since the sensor described in Patent Document 1 has a configuration in which a lead wire is soldered to the electrode portion and extended to the outside, it is very difficult to solder the lead wire to the electrode portion as the size is reduced. This is a complicated task.
[0009]
In the sensor described in Patent Document 1, as described above, the leaf spring is sandwiched between a stationary plate provided on the electrode portion and a leaf spring supporting portion provided inside the case, and the stationary spring is fixed. Since the plate spring is supported and fixed in the case by screwing the plate to the plate spring support portion, the electrode portion is damaged when a strong clamping force acts on the electrode portion from the fixed portion by screwing. Such a problem is likely to occur. On the other hand, if the tightening force is weak, the leaf spring is likely to be displaced in the case as the leaf spring vibrates.
[0010]
Therefore, the present invention is for solving the above-described conventional problems, and in particular, in order to achieve miniaturization, a connection structure between electrodes that enables a simple structure and a good connection structure between the electrodes, and the same. It aims at providing the used sensor.
[0011]
[Means for Solving the Problems]
The connection structure between the electrodes in the present invention includes a substrate provided with an electrode portion, a first member provided with a connection electrode portion projecting at a position facing the electrode portion, and interposed between the substrate and the first member. And a first elastic member provided with a hole through which the connection electrode portion passes,
A second member is provided on a surface opposite to the surface on which the electrode portion of the substrate is provided, and the connection electrode portion is formed on the first elastic member by bonding between the first member and the second member. A conductive connection is made with the electrode portion through the hole.
[0012]
In the above invention, the lead member or the like is not soldered to the electrode part as in the prior art, but the electrode part provided on the substrate and the first member provided with the connection electrode part at a position facing the electrode part. And a first elastic member provided with a hole portion through which the connection electrode portion is passed, and the connection electrode portion is electrically connected to the electrode portion through a hole portion formed in the first elastic member. Thus, the connection structure of the electrode part can be formed with a simple structure as compared with the conventional structure, and the pressing force between the electrode part and the connection electrode part is moderately relaxed by the elastic force of the elastic member, and the electrode part and the connection electrode part Can be prevented, and a good conductive connection state can be maintained.
[0013]
In the present invention, the second elastic member is provided between the surface opposite to the surface on which the electrode portion of the substrate is provided and the second member, so that the pressing force between the electrode portion and the connection electrode portion is further increased. It is preferable because it can be relaxed to an appropriate size and can maintain a good conductive connection state.
[0014]
In the present invention, the second elastic member is provided with a protruding portion protruding in the direction of the electrode portion at a position facing the electrode portion formed on the substrate, and by joining the first member and the second member. It is preferable that the protruding portion presses the electrode portion in the direction of the connection electrode portion because a good conductive connection state can be maintained between the electrode portion and the connection electrode portion more effectively.
[0015]
Moreover, in this invention, it is preferable that the thickness of the said 1st elastic member is larger than the height of the connection electrode part which protrudes from the surface of the said 1st member.
[0016]
In the present invention, in the sensor using any one of the connection structures between the electrodes,
The substrate is a leaf spring member having elasticity, a weight is attached to a free end side of the leaf spring member, and the electrode portion is formed on a fixed end side of the leaf spring member,
The first member is a first case, the second member is a second case, and a weight attached to the leaf spring member is located in a space formed between the first case and the second case, The electrode portion of the leaf spring member is conductively connected to the connection electrode portion protruding from the surface of the first case via the first elastic member, and the fixed end of the leaf spring member is between the first case and the second case. It is sandwiched between and supported and fixed.
[0017]
In the above configuration, the connection structure of the electrode part can be formed with a simple structure, and the pressing force between the electrode part and the connection electrode part is moderately relaxed by the elastic force of the elastic member, and the electrode part and the connection electrode part are Can be prevented, and a good conductive connection state can be maintained.
[0018]
Further, even if the leaf spring member vibrates due to the elastic force of the leaf spring member, the vibration force is effectively absorbed by the first elastic member on the fixed portion side of the leaf spring member. Even if it is not fixed with an adhesive or the like, the leaf spring member does not cause a positional shift or the like by interposing the first elastic member between the leaf spring member and the first member, and the leaf spring has a simple structure. The member can be fixedly supported inside the case.
[0019]
In the present invention, a conductive member is insert-molded in the first case, the conductive member protruding from the surface of the first case constitutes the connection electrode portion, and the conductive member is formed of the first case. It is preferable that the portion that extends outward from the side surface and that extends outward constitutes a terminal portion. Thereby, formation of a connection electrode part and formation of the terminal part pulled out from the said connection electrode part can be formed with a very simple structure.
[0020]
In the present invention, it is preferable that the fixed end of the leaf spring member is formed to extend laterally compared to the free end. Accordingly, the fixed end can be formed in a wide area, and the leaf spring member can be fixed and supported in the case more reliably.
[0021]
In the present invention, the fixed end may be configured by a side portion formed to extend laterally as compared to the free end, and a leg portion extending in the free end direction from an end portion of the side portion. Good.
[0022]
Further, in the present invention, the first case and the second case are surrounded on the four sides by side walls, the connection electrode part protrudes from the surface of the side wall part, and the fixed end of the leaf spring member is connected to the first case and the second case. It is preferable to be sandwiched between the side walls of the two cases because a connection structure between the electrodes of the sensor can be formed with a simple structure.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a vibration sensor before assembly in which the sensor (vibration sensor) according to the present invention is disassembled into constituent members, and FIG. 2 is a reference numeral for the vibration sensor after the constituent members shown in FIG. FIG. 3 is a partial sectional view of the member 2 cut from the line II-II at a position cut in a direction parallel to the YZ plane shown in FIG. The vibration sensor after assembling the components is cut at a position where the member 3 is cut from the line III-III in a direction parallel to the YZ plane shown in the figure, and the cut surface is viewed from the direction of the arrow. 4 is a cross-sectional view of the vibration sensor after assembling the components shown in FIG. 1 at a position where the member 5 is cut downward from the IV-IV line, and the cut surface is in the direction of the arrow. FIG. 5 is an enlarged view of the member denoted by reference numeral 3 shown in FIG. The members of the reference numeral 9 is a partially enlarged perspective view showing a state removed from the member code 3.
[0024]
Reference numeral 1 shown in FIG. 1 denotes an upper case (second case), which is a resin case formed of a resin such as polyethylene (PE), polypropylene (PP), or polyphenylene sulfide (PPS). As shown in FIG. 3, the upper case 1 includes an upper plate 7 and four side walls 6 that project downward from the periphery of the upper plate 7 together with the upper plate 7. Thus, a space 8 surrounded by the upper plate 7 and the side wall 6 is formed in the upper case 1. The side wall 6 further includes an inner wall portion 6a and an outer wall portion 6b that is located outward from the inner wall portion 6a and projects downward from the inner wall portion 6a.
[0025]
Reference numeral 2 shown in FIG. 1 is an elastic member (second elastic member) formed of rubber or the like. It is important that the elastic member 2 has a small change in hardness due to a temperature change. For example, the elastic member 2 is preferably a silicon rubber or a fluorine rubber. The maximum elastic loss frequency (hereinafter referred to as MEF) of the elastic member 2 is preferably greater than the self-resonant frequency (hereinafter referred to as SRF) at the elastic portion 3a of the leaf spring member 3 within the range of operating temperature. This eliminates the need to limit applications that use vibration at the self-resonant frequency. If the MEF is lower than the SRF, for example, in a case where the collision is detected by monitoring the SRF of the sensor output, the impact energy is absorbed by the rubber elastic body, and the sensitivity is significantly lowered. The vibration sensor itself is held by the vibration absorbing damper.
[0026]
The elastic member 2 has a surrounding shape in which the end portions of the four pieces 2a are integrally connected so as to have a rectangular window portion 2b in the center. Each piece 2 a of the elastic member 2 is installed on the lower surface of the inner wall 6 a of the upper case 1.
[0027]
As shown in FIG. 1, two protruding portions 2a1 protrude downward from the left piece 2a of the elastic member 2. Similarly, one protrusion 2a1 protrudes downward from the piece 2a on the right side of the figure. These projecting portions 2a1 are formed at positions just opposite to the electrode portions 11 and 13 formed on the leaf spring member 3 described below.
[0028]
Reference numeral 3 shown in FIG. 1 is a leaf spring member. The leaf spring member 3 includes an elastic portion 3a that can be elastically deformed and a fixing portion 3b that is sandwiched between the upper case 1 and the lower case 5 and supported and fixed.
[0029]
As shown in FIG. 5, a weight 9 is attached to the free end 3a1 of the elastic portion 3a. The weight 9 is provided with an insertion hole 9a at a position facing the free end 3a1 of the elastic portion 3a, and the free end 3a1 is inserted into the insertion hole 9a, whereby the weight 9 is It can be attached to the free end 3a1 of the elastic part 3a.
[0030]
The weight 9 is, for example, brass and the weight is, for example, 22 mg.
The leaf spring member 3 shown in FIG. 5 is formed of an organic insulating film. The organic insulating film includes a resin film that does not cause physical or scientific modification such as glass transition within a use temperature range (for example, about −40 ° C. to 85 ° C.) such as polyimide, polyethylene terephthalate, and polybutylene terephthalate. Although it can be used, it is particularly preferable to use a resin film formed of polyimide.
[0031]
As shown in FIG. 5, the fixing portion 3b includes a side portion 3b1 extending from the base end 3a2 of the elastic portion 3a of the leaf spring member 3 toward both sides (X direction in the drawing), and the side The leg portions 3b2 and 3b2 are bent from both ends of the side portion 3b1 and extend in the direction of the free end 3a1 (Y direction in the drawing) of the elastic portion 3a.
[0032]
As shown in FIG. 5, a variable resistance portion 10 is formed on the lower surface of the elastic portion 3a. In addition, two electrode portions 11 and 11 and a resistance portion 19 formed between the electrode portions 11 and 11 are formed on the lower surface of the left leg portion 3b2 of the fixed portion 3b. Further, one electrode portion 13 is formed on the lower surface of the leg portion 3b2 on the right side of the fixed portion 3b. The resistance portion 19 may not be formed on the leaf spring member 3 by printing or the like, and may be provided outside the sensor. The arrangement of the electrode parts 11 and 13 and the resistance part 19 shown in FIG. 5 is merely an example.
[0033]
As shown in FIG. 5, the electrode portion 13 formed on the lower surface of the leg 3b2 on the right side of the drawing is electrically connected to the variable resistor portion 10 formed on the lower surface of the elastic portion 3a. 10 and the electrode part 11-resistor part 19-electrode part 11 formed on the lower surface of the leg part 3b2 on the left side of the figure are connected in conduction.
[0034]
The variable resistance portion 10 shown in FIG. 5 is, for example, a carbon film. When the elastic portion 3a is elastically deformed, the carbon film expands and contracts accordingly, thereby changing the resistance value of the carbon film. In order to increase the amount of change in the resistance value due to the expansion and contraction, it is preferable to use a carbon film as in the present invention.
[0035]
The electrode portions 11 and 13 are preferably formed of a material having excellent conductivity and corrosion resistance, such as a silver film. The resistance portion 19 is formed of a carbon film or the like, similar to the variable resistance portion 10.
[0036]
The variable resistance part 10, the electrode parts 11 and 13, and the resistance part 19 are directly printed on the lower surface of the leaf spring member 3 formed of an organic insulating film. The printing method is, for example, a screen printing method.
[0037]
Reference numeral 4 shown in FIG. 1 is an elastic member (first elastic member) 4 such as rubber. Similar to the elastic member 2, the elastic member 4 has a surrounding shape in which the end portions of the four pieces 4a are integrally connected so that a rectangular window portion 4b is formed at the center thereof. Each piece 4 a of the elastic member 4 is installed on the upper surface of the inner wall portion 12 a of the lower case 5. The material of the elastic member 4 is the same as that of the elastic member 2.
[0038]
As shown in FIG. 1, two holes 4 a 1 are formed in the left side piece 4 a of the elastic member 4. Similarly, one hole 4a1 is formed in the right piece 4a in the drawing. These hole portions 4a1 are formed at positions facing connection electrode portions 15 and 16 projecting from the lower case 5 to be described below, and have a size that allows the connection electrode portions 15 and 16 to pass therethrough. It is formed.
[0039]
Reference numeral 5 shown in FIG. 1 is a lower case (first member). The lower case 5 is a resin case formed of a resin such as polyethylene (PE), polypropylene (PP), polyphenylene sulfide (PPS), etc., like the upper case 1. As shown in FIG. 3, the lower case 5 includes a bottom plate 14 and four side walls 12 that project upward from the periphery of the bottom plate 14 together with the bottom plate 14. Accordingly, a space 20 surrounded by the bottom plate 14 and the side wall 12 is formed in the lower case 5. The side wall 12 further includes an inner wall portion 12a and an outer wall portion 12b that is located outward from the inner wall portion 12a and projects upward from the inner wall portion 12a.
[0040]
As shown in FIG. 1, two conductive members 17 are provided so as to pass through the inside of the side wall 12 from the side surface 5a on the left side of the lower case 5 to be exposed on the upper surface of the side wall 12, and one conductive member 18 is provided. The lower case 5 is provided so as to pass through the inside of the side wall 12 from the right side surface 5a of the lower case 5 and be exposed on the upper surface of the side wall 12.
[0041]
The portion of the conductive member 17 protruding from the upper surface of the left side wall 12 shown in the drawing constitutes the connection electrode portions 15, 15, and the portion of the conductive member 18 protruding from the upper surface of the right side wall 12 shown in the drawing constitutes the connection electrode portion 16. To do. These connection electrode portions 15 and 16 are arranged from the upper surface of the inner wall portion 12a of the lower case 5 so as to face the electrode portions 11 and 13 formed on the lower surface of the leg portion 3b2 of the leaf spring member 3. Protrusions are formed.
[0042]
As shown in FIG. 1, the conductive members 17 and 18 protrude outward from the side surface 5a of the lower case 5, and the protruding portions constitute terminal portions 17a, 17b and 18a, respectively.
[0043]
The conductive members 17 and 18 are formed in the lower case 5 by, for example, insert molding.
[0044]
As shown in FIG. 3, the pieces 2 a and 4 a of the elastic members 2 and 4 are formed to have a size that is sandwiched between the inner walls 6 a and 12 a of the upper case 1 and the lower case 5, and the leaf spring member 3. The fixed portion 3b is formed within a size range of the pieces 2a and 4a of the elastic members 2 and 4 opposed vertically. For this reason, the outer dimensions of the upper case 1 and the lower case 5 are slightly larger than those of the elastic members 2, 4 and the leaf spring member 3.
[0045]
As shown in FIG. 3, the lower surface of the outer wall portion 6b of the upper case 1 and the upper surface of the outer wall portion 12b of the lower case 5 are joined together, and an adhesive or the like is applied between the joint surfaces to thereby form the upper case 1. And the lower case 5 are bonded and fixed. For example, the adhesive permeates between the joint surfaces by capillary action by applying the adhesive on the boundary portion when the upper case 1 and the lower case 5 are stacked one above the other. At this time, a slight amount of adhesive may be applied to the elastic members 2 and 4.
[0046]
As shown in FIG. 3, when the upper case 1 and the lower case 5 are joined, a three-dimensionally enclosed space is formed in the interior. As shown in FIG. 3 and FIG. 4, the elastic portion 3 a of the leaf spring member 3 and the weight 9 attached to the free end 3 a 1 of the elastic portion 3 a are located in the space, and the weight 9 is moved up and down by vibration. The elastic part 3a causes elastic deformation in the space.
[0047]
For example, a power supply unit (not shown) is connected to the terminal unit 17a shown in FIG. 1, the terminal unit 18a shown in FIG. 1 is grounded, and the terminal unit 17b is connected to a detection unit (not shown). When the voltage at the power supply unit is Vcc, the resistance value of the resistance unit 19 is R, the resistance value of the variable resistance unit 10 is Rx, and the voltage at the detection unit is Vo, the formula Vo = [Rx / (Rx + R)] Vcc is established. To do.
[0048]
Now, when the weight 9 vibrates up and down and the elastic part 3a of the leaf spring member 3 is elastically deformed up and down, the carbon film which is the variable resistance part 10 provided on the lower surface of the elastic part 3a expands and contracts. As a result, the resistance value Rx of the variable resistance portion 10 changes, and as a result, a potential difference ΔVo is generated, which makes it possible to detect the vibration state and inclination angle of the elastic portion 3a.
[0049]
In the present invention, as described above, the leaf spring member 3 is formed of an organic insulating film. As a result, even if the leaf spring member 3 is formed with a very small size and a light weight 9 is attached to the elastic portion 3a of the leaf spring member 3, the elastic portion 3a can be elastically deformed satisfactorily. It is. Therefore, the size of the leaf spring member 3 itself can be made very small as compared with the prior art.
[0050]
As shown in FIG. 5, the length dimension T1 of the leaf spring member 3 is, for example, about 5 mm. The width T2 of the leaf spring member 3 is about 7 mm. The length T3 of the elastic portion 3a of the leaf spring member 3 is about 2 mm, and the width T4 of the elastic portion 3a is about 1 mm. Further, the thickness of the leaf spring member 3 can be reduced to about 0.075 mm when the leaf spring member 3 is polyimide.
[0051]
The characteristic part of the sensor in the present invention will be described below.
The present invention is characterized by the connection structure between the connection electrode portion 15 formed on the lower case 5 and the electrode portions 11 and 13 formed on the leg portions 3b2 of the leaf spring member 3.
[0052]
FIG. 2 is a partial cross-sectional view showing the connection structure of the electrodes of the sensor completed by assembling the constituent members shown in FIG.
[0053]
As shown in FIG. 2, the connection electrode portion 15 exposed from the upper surface of the inner wall portion 12a of the lower case 5 (here, the connection structure of the connection electrode portion indicated by reference numeral 15 will be described. The connection structure of the connection electrode portion indicated by reference numeral 16 is also described. Is exactly the same) through the hole 4 a 1 formed in the elastic member 4, exposed from the hole 4 a 1, and disposed at a position facing the connection electrode portion 15. The electrode part 11 formed on the lower surface of the leg part 3b2 and the connection electrode part 15 are in contact with each other through the hole part 4a1 of the elastic member 4.
[0054]
In the present invention, since the elastic member 4 is interposed between the leaf spring member 3 and the lower case 5, the elastic member 4 is slightly deformed by the pressing force when the upper case 1 and the lower case 5 are joined. Causes elastic deformation. As a result, the electrode portion 11 formed on the leaf spring member 3 and the electrode portion 15 formed on the lower case 5 do not contact with an extremely strong force, but receive an appropriate contact force and receive the electrode portion 11. 15 are in contact with each other, so that the electrode portions 11 and 15 are not damaged and can always maintain a good conduction state.
[0055]
Further, as in the present invention, connection electrode portions 15 and 16 are formed to project from the lower case 5 at positions facing the electrode portions 11 and 13, and the electrode portions 11 and 13 and the connection are connected via the elastic member 4. By attaching the electrode portions 15 and 16 together, the conventional troublesome operation such as connecting the lead wire to the electrode portion by soldering or the like is not necessary, and a connection structure between the electrodes can be realized with a simple structure.
[0056]
Therefore, if the connection structure between the electrodes in the present invention is used, it is possible to more effectively promote downsizing of the sensor itself.
[0057]
In the sensor according to the present invention, the elastic portion 3a of the leaf spring member 3 is shaken by vibration, and the vibration at this time is transmitted in the direction of the fixed portion 3b of the leaf spring member 3. Since the vibration force is relieved, the elastic member 4 is interposed between the electrode parts 11 and 13 and the connection electrode parts 15 and 16 without being soldered, and the structure between the upper case 1 and the lower case 5 is pressed. By doing so, the leaf spring member 3 can be firmly supported and fixed inside the case, and a good connection structure between the electrodes can be maintained without causing positional displacement between the electrodes.
[0058]
Further, since the stress generated when the elastic portion 3a of the leaf spring member 3 is elastically deformed is relieved by the elastic member 4, the stress is prevented from concentrating on the base portions 3a3 and 3a3 of the elastic portion 3a. it can. For this reason, even if the elastic portion 3a repeatedly vibrates or the elastic portion 3a shakes extremely large, the base 3a3 portion of the elastic portion 3a is deteriorated due to whitening or the elastic portion 3a is plastically deformed. This can be suppressed, and the elastic portion 3a can be prevented from deteriorating and the durability can be improved.
[0059]
In the present invention, it is preferable that an elastic member 2 is also provided between the upper case 1 and the leaf spring member 3 as shown in FIG. By providing the elastic members 2 and 4 above and below the leaf spring member 3, the pressing force acting between the electrode portions 11 and 13 and the connection electrode portions 15 and 16 when the upper case 1 and the lower case 5 are joined. Is moderately relaxed, and it is possible to more effectively prevent the electrode portions 11 and 13 and the connection electrode portions 15 and 16 from being damaged and maintain a good conductive connection state.
[0060]
Further, in the present invention, as shown in FIG. 2, the elastic member 2 is formed with a protrusion 2a1 protruding downward, and the protrusion 2a1 is formed when the upper case 1 and the lower case 5 are joined. In order to generate a downward pressing force, the protruding portion 2a1 presses the electrode portion 11 of the leaf spring member 3 downward, and as a result, is formed on the electrode portion 11 of the leaf spring member 3 and the lower case 5. The electrode unit 15 can be connected to the electrode unit 15 more favorably, and the electrode units 11 and 15 can be more effectively prevented from being displaced due to impact or the like without using an adhesive or solder. .
[0061]
The height of the electrode portion 15 protruding from the upper surface of the side wall 12 of the lower case 5 is adjusted to be slightly lower than the thickness of the elastic member 4. As a result, when the elastic member 4 is joined between the lower case 5 and the upper case 1, the elastic member 4 undergoes a slight elastic deformation and receives an appropriate pressing force from the protruding portion 2 a 1 of the elastic member 2. 3 electrode part 11 and the electrode part 15 of the said lower case 5 maintain a favorable electrical connection state.
[0062]
In order to more preferably fix and support the leaf spring member 3 inside the case, as shown in FIG. 5, the fixing portion 3b of the leaf spring member 3 is moved laterally from the base end 3a2 of the elastic portion 3a. It is preferable to form it extending.
[0063]
As a result, the area of the fixed portion 3b can be made larger than the area of the elastic portion 3a, and the leaf spring member 3 can be firmly fixed and supported in the case by the fixed portion 3b.
[0064]
Moreover, in this invention, as shown in FIG. 5, the fixing | fixed part 3b of the said leaf | plate spring member 3 has the side part 3b1 extended toward the side from the base end 3a2 of the said elastic part 3a, and the side part 3b1. It is preferable to be configured with leg portions 3b2 extending from both side end portions toward the free end 3a1 direction of the elastic portion 3a. By providing not only the side part 3b1 but also the leg part 3b2 in the fixing part 3b, the area of the fixing part 3b can be expanded more than the area of the elastic part 3a, and the leaf spring member can be more stably provided. 3 can be supported and fixed in the case. Further, by providing the leg portion 3b2 on the fixed portion 3b, the electrode portions 11 and 13 and the resistance portion 19 can be provided on the leg portion 3b2, and the degree of freedom of the positions where the electrode portions 11 and 13 and the resistance portion 19 are formed. Can be spread.
[0065]
In the present invention, the fixing portion 3b extends toward both sides of the base end 3a2 of the elastic portion 3a. However, the fixing portion 3b is formed to extend only on one side of the base end 3a2. Also good. However, it is possible to more stably support and fix the leaf spring member 3 in the case when the fixing portion 3b is extended and formed toward both sides of the base end 3a2 of the elastic portion 3a. is there.
[0066]
In the present invention, the case is divided into an upper case 1 and a lower case 5, and the elastic members 2, 4 and the leaf spring member 3 are sandwiched between the upper case 1 and the lower case 5. It has become. The fixed portion 3b of the leaf spring member 3 is formed between the inner wall portions 6a and 12a of the cases 1 and 5, and the fixed portion 3b is interposed between the inner walls 6a and 12a. The structure is sandwiched between the parts 6a and 12a. Thus, the leaf spring member 3 is sandwiched between the upper case 1 and the lower case 5 via the elastic members 2 and 4 so as to be supported and fixed. Therefore, the leaf spring member has a simple structure. Can be supported and fixed inside the case, and it is not necessary to use a complicated support and fixing structure such as fixing with solder or adhesive or fixing with screws.
[0067]
In particular, in order to install the leaf spring member 3 at a predetermined position, for example, a rib (not shown) directed from the side wall 12 of the lower case 5 toward the upper case 1 shown in FIG. The leaf spring member 3 is provided with holes at positions facing the ribs, and when the elastic members 2, 4 and the leaf spring member 3 are sandwiched between the upper case 1 and the lower case 5, the ribs are inserted into the holes. The leaf spring member 3 can be more easily installed at a predetermined position.
[0068]
The above-described sensor according to the present invention is expected to be used for miniaturized devices such as mobile phones.
[0069]
【The invention's effect】
In the present invention described above, the electrode part provided on the substrate (plate spring member), the first member (lower case) provided with the connection electrode part at a position facing the electrode part, and the connection electrode part A first elastic member provided with a hole to pass through, and the connection electrode portion is electrically connected to the electrode portion through a hole formed in the first elastic member. The connection structure of the electrode part can be formed with a simple structure, and the pressing force between the electrode part and the connection electrode part is moderately relaxed by the elastic force of the elastic member, so that the electrode part and the connection electrode part can be prevented from being damaged. At the same time, a good conductive connection state can be maintained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view in which a sensor of the present invention is disassembled into constituent members;
2 is a cross-sectional view of the sensor after assembling the constituent members shown in FIG. 1 at a position where the elastic member 2 is cut from the line II-II in a direction parallel to the YZ plane shown in FIG. Is a partial cross-sectional view as seen from the direction of the arrow,
3 cuts the sensor after assembling the constituent members shown in FIG. 1 at a position where the leaf spring member 3 is cut from the line III-III in a direction parallel to the YZ plane shown in FIG. Partial sectional view of the surface viewed from the direction of the arrow,
4 is a partial cross-sectional view of the sensor after assembling the constituent members shown in FIG. 1 at a position where the lower case 5 is cut downward from the IV-IV line and the cut surface is seen from the arrow direction. Figure,
5 is a partially enlarged perspective view showing a state in which the leaf spring member 3 shown in FIG. 1 is enlarged and a weight 9 is removed from the leaf spring member 3. FIG.
[Explanation of symbols]
1 Upper case
2, 4 Elastic member
3 Leaf spring member
3a Elastic part
3b fixed part
5 Lower case
6, 12 Side wall
9 spindles
10 Variable resistance section
11, 13 Electrode section
15, 26 Connection electrode part
17, 18 Conductive member

Claims

A substrate provided with an electrode part, a first member provided with a connection electrode part protruding in a position facing the electrode part, and interposed between the substrate and the first member, and the connection electrode part penetrates A first elastic member provided with a hole,
A second member is provided on a surface opposite to the surface on which the electrode portion of the substrate is provided, and the connection electrode portion is formed on the first elastic member by bonding between the first member and the second member. A connection structure between electrodes, wherein the electrode part is conductively connected through a hole.

The connection structure between electrodes according to claim 1, wherein a second elastic member is provided between a surface opposite to the surface on which the electrode portion of the substrate is provided and a second member.

A protruding portion protruding in the direction of the electrode portion is provided at a position facing the electrode portion formed on the substrate of the second elastic member, and the protruding portion is formed by joining between the first member and the second member. The connection structure between electrodes according to claim 2, wherein the electrode part is pressed in the direction of the connection electrode part.

4. The connection structure between electrodes according to claim 1, wherein a thickness of the first elastic member is larger than a height of a connection electrode portion protruding from a surface of the first member. 5.

In the sensor using the connection structure between the electrodes according to any one of claims 1 to 4,
The substrate is a leaf spring member having elasticity, a weight is attached to a free end side of the leaf spring member, and the electrode portion is formed on a fixed end side of the leaf spring member,
The first member is a first case, the second member is a second case, and a weight attached to the leaf spring member is located in a space formed between the first case and the second case, The electrode portion of the leaf spring member is conductively connected to the connection electrode portion protruding from the surface of the first case via the first elastic member, and the fixed end of the leaf spring member is between the first case and the second case. A sensor that is sandwiched between and supported and fixed.

A conductive member is insert-molded in the first case, and the conductive member protruding from the surface of the first case constitutes the connection electrode portion, and the conductive member is outward from the side surface of the first case. The sensor according to claim 5, wherein the extended portion and the outwardly extending portion constitute a terminal portion.

The sensor according to claim 5 or 6, wherein the fixed end of the leaf spring member is formed to extend laterally as compared to a free end.

The said fixed end is comprised from the side part extended and formed in a side compared with a free end, and the leg part extended in the said free end direction from the edge part of the side part. The sensor described.

The first case and the second case are surrounded on all sides by side walls, the connection electrode part protrudes from the surface of the side wall part, and the fixed end of the leaf spring member is the side wall of the first case and the second case The sensor according to any one of claims 5 to 8, which is sandwiched between parts.