JP4195817B2

JP4195817B2 - Push button switch

Info

Publication number: JP4195817B2
Application number: JP2003006363A
Authority: JP
Inventors: 健小澤
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2003-01-14
Filing date: 2003-01-14
Publication date: 2008-12-17
Anticipated expiration: 2023-01-14
Also published as: JP2004220901A

Description

【０００１】
【発明の属する技術分野】
本発明は種々の電子機器のプリント基板に面実装によって取り付けられるものに使用して好適な押釦スイッチに関する。
【０００２】
【従来の技術】
従来の押釦スイッチの図面を説明すると、図１３は従来の押釦スイッチの正面図、図１４は従来の押釦スイッチの側面図、図１５は従来の押釦スイッチに係り、ハウジングの内部を示す要部断面図である。
【０００３】
次に、従来の押釦スイッチの構成を図１３〜図１５に基づいて説明すると、合成樹脂の成型品からなるハウジング５１は、箱形をなし、側方に位置する前面５１ａと、前面５１ａから後方に延びる底壁５１ｂと、この底壁５１ｂの端部から上方に延びる一対の側壁５１ｃと、この一対の側壁５１ｃ間に設けられた上壁５１ｄと、後面を塞ぐ後壁５１ｅと、前面５１ａの中央部に設けられた開口部５１ｆと、一対の側壁１ｃの外面に設けられた台形状の凸部５１ｇとを有する。
【０００４】
金属板からなる第１，第２の固定接点５２，５３のそれぞれは、接点部５２ａ、５３ａと、端子部５２ｂ、５３ｂを有し、この第１，第２の固定接点５２，５３は、ハウジング５１に埋設して取り付けられ、接点部５２ａ、５３ａは、後壁５１ｅ上で、開口部５１ｆ内に露出すると共に、端子部５２ｂ、５３ｂは、後壁５１ｅから露出して配置されている。
【０００５】
そして、ハウジング５１に取り付けられた第１，第２の固定接点５２，５３の端子部５２ｂ、５３ｂの下面は、底壁５１ｂの下面と面一状態で、配置されている。
【０００６】
ゴムからなるドーム状の可動接点５４は、ドーム状部５４ａと、ドーム状部５４ａ内の中央部に設けられた接点部５４ｂを有し、この可動接点５４は、開口部５１ｆ内に収納され、接点部５４ｂを接点部５２ａ、５３ａに対向させた状態で、ドーム状部５４ａの裾部を後壁５１ｅに当接させて取り付けられる。
【０００７】
金属板からなる全体が略コ字状のカバー５５は、中央部に孔５５ａを有する板状の前面板５５ｂと、この前面板５５ｂの両端から直角に折り曲げられた一対の側面板５５ｃと、一対の側面板５５ｃの下端から外方に直角に折り曲げられた一対の折り曲げ片５５ｄと、一対の側面板５５ｃに設けられた台形状の孔からなる凹部５５ｅとを有する。
【０００８】
このカバー５５は、前面板５５ｂで開口部５１ｆを塞ぐように、前面板５５ｂがハウジング５１の前面５１ａに配置され、一対の側面板５５ｃを側壁５１ｃの外周面に配置し、凹部５５ｅに凸部５１ｇに掛け止めして、ハウジング５１に取り付けられる。
【０００９】
そして、カバー５５がハウジング５１に取り付けられた際、折り曲げ片５５ｄの下面は、底壁５１ｂの下面と面一状態で、配置されている。
【００１０】
合成樹脂の成型品からなる押釦である操作部材５６は、操作部５６ａと、この操作部５６ａの後部に設けられた鍔部５６ｂを有し、この操作部材５６は、鍔部５６ｂが開口部５１ｆ内に収納され、操作部５６ａが孔５５ａから外部に突出ようにして、ハウジング５１に対して前後に移動可能に取り付けられている。
【００１１】
このような構成を有する押釦スイッチは、図１３，図１４に示すように、ハウジング５１の底壁５１ｂの下面がプリント基板５７上に載置され、端子部５２ｂ、５３ｂとカバー５５の一対の折り曲げ片５５ｄ、及び前面板５５ｂの下部がプリント基板５７上に設けられた導電パターン（図示せず）に半田付けされて取り付けられて、押釦スイッチがプリント基板５７に面実装されている。
【００１２】
そして、操作部材５６の操作部５６ａがプリント基板５７と平行な方向に押圧されると、可動接点５４のドーム状部５４ａが押されて反転動作する。
その結果、接点部５４ｂが接点部５２ａ、５３ａに接触して、接点部５２ａ、５３ａ間がＯＮ状態となる。
【００１３】
また、操作部５６ａの押圧を解除すると、ドーム状部５４ａは、自己のバネ性で元の状態に復帰し、これによって、操作部材５６も元の状態に戻されると共に、接点部５２ａ、５３ａ間がＯＦＦ状態となる。（例えば、特許文献１参照）
【００１４】
しかしながら従来の押釦スイッチは、カバー５５がプリント基板５７に半田付けされて固定された状態で、操作部材５６を押圧した際、その押圧方向が矢印Ｐ１方向の場合、操作部材５６の上方への移動に伴って、ハウジング５１の前面５１ａ側がハウジング５１の後端部（プリント基板への当接部）を支点として上方に移動する。
【００１５】
そして、ハウジング５１の前面５１ａ側の上方への移動は、移動側である前面５１ａから離れた側面板５５ｃの位置において、側面板５５ｃの凹部５５ｅと側壁５１ｃの凸部５１ｇとが係合関係となっているために、上方への移動が大きくなり、このため操作性が悪く、且つ、前面５１ａ側の上方への大きな移動の繰り返しによって、端子部５２ｂ、５３ｂとプリント基板５７との間の半田が剥がれる。
【００１６】
また、ハウジング５１の側壁５１ｃに凸部５１ｇが設けられ、この凸部５１ｇが側面板５５ｃの凹部５５ｅに嵌合するようにしたため、横方向に大型になるものであった。
【００１７】
【特許文献１】
特開２００２−９３２７２号公報
【００１８】
【発明が解決しようとする課題】
従来の押釦スイッチは、ハウジング５１の側壁５１ｃに凸部５１ｇが設けられ、この凸部５１ｇが側面板５５ｃの凹部５５ｅに嵌合するようにしたため、横方向に大型になるという問題ある。
また、押釦スイッチがプリント基板５７に取り付けられた際、側面板５５ｃの凹部５５ｅと側壁５１ｃの凸部５１ｇとが係合関係となっているために、ハウジング５１の前面５１ａ側の上方への移動が大きくなり、このため操作性が悪く、且つ、前面５１ａ側の上方への大きな移動の繰り返しによって、端子部５２ｂ、５３ｂとプリント基板５７との間の半田が剥がれるという問題がある。
【００１９】
そこで、本発明は小型で、操作性が良く、半田の剥がれの少ない押釦スイッチを提供することを目的とする。
【００２０】
【課題を解決するための手段】
上記課題を解決するための第１の解決手段として、前面に開口部を有する絶縁材からなるハウジングと、このハウジングに取り付けられた固定接点と、前記開口部内に収納された可動接点と、前記開口部を塞ぐように前記ハウジング前面に配置された前面板を有しプリント基板に取付けられたカバーと、前記前面板に形成された孔を貫通して前記開口部に移動可能に取り付けられ、前記可動接点を操作する操作部材と、前記ハウジングの前面に設けられた凸部と前記カバーの前面板に設けられ前記凸部が挿入される係合領域とからなる係合部とを備え、前記ハウジングの下面は、前記ハウジングの前面に対して直角状態に位置すると共に前記プリント基板に取付可能な取付面となし、前記凸部外周面と前記係合領域の内周面との間の最大隙間を、前記前面板に形成された孔と前記操作部材の外径との間の隙間よりも小さく設定し、前記ハウジングの前面側が前記プリント基板から離れるように上方に移動した際、前記操作部材と前記前面板の孔とが当接する前に、前記係合部の凸部と係合領域とを係合させて、前記ハウジングの上方への移動を阻止するようにした構成とした。
また、前面に開口部を有する絶縁材からなるハウジングと、このハウジングに取り付けられた固定接点と、前記開口部内に収納された可動接点と、前記開口部を塞ぐように前記ハウジング前面に配置された前面板を有しプリント基板に取付けられたカバーと、前記前面板に形成された孔を貫通して前記開口部に移動可能に取り付けられ、前記可動接点を操作する操作部材と、前記カバーの前面板に設けられた凸部と前記ハウジングの前面に設けられ前記凸部が挿入される係合領域とからなる係合部とを備え、前記ハウジングの下面は、前記ハウジングの前面に対して直角状態に位置すると共に前記プリント基板に取付可能な取付面となし、前記凸部外周面と前記係合領域の内周面との間の最大隙間を、前記前面板に形成された孔と前記操作部材の外径との間の隙間よりも小さく設定し、前記ハウジングの前面側が前記プリント基板から離れるように上方に移動した際、前記操作部材と前記前面板の孔とが当接する前に、前記係合部の凸部と係合領域とを係合させて、前記ハウジングの上方への移動を阻止するようにした構成とした。
【００２１】
また、第２の解決手段として、前記係合部は、前記プリント基板を基準にして、前記操作部材の軸線よりも上方の位置に配置した構成とした。
また、第３の解決手段として、前記係合部は、合成樹脂からなる前記ハウジングに設けられた前記凸部と、金属板からなる前記カバーに設けられた挿通孔とで構成され、前記凸部が前記挿通孔に隙間が形成されるように緩く嵌合されて係合可能とした構成とした。
【００２２】
また、第４の解決手段として、前記固定接点に接続された端子部は、前記ハウジングから露出した状態で、前記ハウジングの前記下面に沿って配置され、前記端子部と前記カバーが前記プリント基板に半田付け可能とした構成とした。
【００２３】
また、第５の解決手段として、前記カバーは、前記前面板から前記ハウジングの側面側に折り曲げられた側面板と、この側面板に設けられた屈曲部を有し、この屈曲部が前記ハウジングの前記側面に設けられた凹み部に掛け止めされた構成とした。
また、第６の解決手段として、前記カバーの前記側面板には、前記プリント基板に挿通可能な突出片が設けられた構成とした。
【００２４】
【発明の実施の形態】
本発明の押釦スイッチの図面を説明すると、図１は本発明の押釦スイッチの第１実施例に係る正面図、図２は本発明の押釦スイッチの第１実施例に係る側面図、図３は本発明の押釦スイッチの第１実施例に係る上面図、図４は本発明の押釦スイッチの第１実施例に係る下面図である。
【００２５】
また、図５は本発明の押釦スイッチの第１実施例に係る要部断面図、図６は図５のＡ部分における拡大断面図、図７は本発明の押釦スイッチの第１実施例に係る背面図、図８は本発明の押釦スイッチの第１実施例に係り、その取付状態を示す説明図である。
【００２６】
また、図９は本発明の押釦スイッチの第１実施例に係り、固定接点とハウジングの製造の第１工程を示す説明図、図１０は本発明の押釦スイッチの第１実施例に係り、固定接点とハウジングの製造の第２工程を示す説明図、図１１は本発明の押釦スイッチの第２実施例に係り、固定接点とハウジングの製造の第１工程を示す説明図、図１２は本発明の押釦スイッチの第２実施例に係り、固定接点とハウジングの製造の第２工程を示す説明図である。
【００２７】
次に、本発明の押釦スイッチの第１実施例の構成を図１〜図８に基づいて説明すると、合成樹脂の成型品からなるハウジング１は、箱形をなし、側方に位置する前面１ａと、前面１ａから後方に延びる底壁１ｂと、この底壁１ｂの端部から上方に延びる一対の側壁１ｃと、この一対の側壁１ｃ間に設けられた上壁１ｄと、後面を塞ぐ後壁１ｅと、前面１ａの中央部に設けられた開口部１ｆと、前面１ａに設けられた突起からなる凸部１ｈを有する。
【００２８】
また、前面１ａ、底壁１ｂ、及び側壁１ｃに面する角部には、切り欠かれた段落ち部１ｊが形成されていると共に、対向する一対の側壁１ｃの後方部の上下角部には、凹み部１ｋが設けられて、段差部が形成されている。
【００２９】
金属板からなる第１，第２、第３の固定接点２，３、４のそれぞれは、特に図９に示すように、前方に突出した第１の接点部２ａ、第２の接点部３ａ、第３の接点部４ａと、この第１，第２，第３の接点部２ａ、３ａ、４ａのそれぞれに連結された第１の連結部２ｂ、第２の連結部３ｂ、第３の連結部４ｂと、この第１，第２，第３の連結部２ｂ、３ｂ、４ｂのそれぞれに繋がった第１の端子部２ｃ、第２の端子部３ｃ、第３の端子部４ｃを有する。
【００３０】
そして、第１，第２，第３の固定接点２，３，４の第１，第２，第３の接点部２ａ、３ａ、４ａは、図９に示すように、直線Ｓ１上に配置されると共に、第１，第２，第３の接点部２ａ、３ａ、４ａのそれぞれから第１，第２，第３の連結部２ｂ、３ｂ、４ｂ、及び第１，第２，第３の端子部２ｃ、３ｃ、４ｃが直線Ｓ１と直交する直線Ｓ２，Ｓ３，Ｓ４方向に延びて配置されている。
【００３１】
その結果、第１，第２，第３の連結部２ｂ、３ｂ、４ｂ、及び第１，第２，第３の端子部２ｃ、３ｃ、４ｃは、互いに平行な状態で配置されている。
この実施例では、第１，第３の固定接点２，４が第４の連結部Ｒ１で繋がれて、各々をコモン接点として使用することにより、スイッチとしての信頼性を向上させているが、この第４の連結部Ｒ１を無くしても良い。
【００３２】
また、第１，第２，第３の固定接点２，３，４は、第１，第２，第３の連結部２ｂ、３ｂ、４ｂ、及び第４の連結部Ｒ１が後壁１ｅに埋設して取り付けられ、第２の接点部３ａが開口部１ｆの中央部（後壁１ｅの中央部）に露出すると共に、第１，第３の接点部２ａ、４ａが第２の接点部３ａを挟んで、開口部１ｆの外周近傍（後壁１ｅの外周）に露出している。
【００３３】
また、第１，第２，第３の端子部２ｃ、３ｃ、４ｃは、ハウジング１の底壁１ｂから外方に突出し、それぞれが端子部引出面である底壁１ｂの下面に沿って後方に折り曲げられており、折り曲げられた第１，第２，第３の端子部２ｃ、３ｃ、４ｃの下面は、底壁１ｂの下面よりも下方に位置した状態となっている。（特に図６参照）
【００３４】
なお、この実施例では、３個の第１，第２，第３の固定接点２，３，４を用いたもので説明したが、２個の第１，第２の固定接点２，３，或いは第２，第３の固定接点３，４で構成しても良い。
【００３５】
ドーム状のバネ性ある金属板等からなる可動接点５は、ハウジング１の開口部１ｆ内に収納され、図５に示すように、中央部が第２の接点部３ａに対向し、外周部が第１，第３の接点部２ａ、４ａに接触した状態で配置されている。
【００３６】
金属板からなる全体が略コ字状のカバー６は、中央部に孔６ａを有する板状の前面板６ｂと、この前面板６ｂの両端から直角に後方に折り曲げられた一対の側面板６ｃと、一対の側面板６ｃの下端から下方に突出する突出片６ｄと、前面板６ｂの対向する左右の下方隅部に設けられた一対の突片６ｅと、この突片６ｅに対向する位置で、一対の側面板６ｃに設けられた切り欠き部６ｆと、前面板６ｂの上方隅部に設けられた小孔からなる凹部６ｇと、一対の側面板６ｃの後方上下に設けられた屈曲部６ｈを有する。
そして、凹部６ｇは、孔６ａの中心部よりも上方に位置して設けられている。
【００３７】
このカバー６は、前面板６ｂで開口部１ｆを塞ぐように、前面板６ｂがハウジング１の前面１ａに配置され、且つ、凹部６ｇにハウジング１の凸部１ｈが挿通され、この凹凸部によって互いに係合可能となると共に、一対の側面板６ｃの後方部に設けられた舌片が凹み部１ｋに嵌入するように折り曲げられて、凹み部１ｋに掛け止めされた屈曲部６ｈが形成されて、ハウジング１に取り付けられる。
即ち、カバー６は、前面板６ｂと屈曲部６ｈとでハウジング１を前後から挟持して、ハウジング１に取り付けられた状態となっている。
【００３８】
そして、カバー６がハウジング１に取り付けられた際、突片６ｅは、段落ち部１ｊに配置され、突片６ｅの下面は、底壁１ｂの下面よりも下方に位置した状態となっていると共に、第１，第２，第３の端子部２ｃ、３ｃ、４ｃの下面と面一状態となっている。
また、この時、突片６ｅと突出片６ｄの裏面が対向するハウジング１の両角部には、段落ち部１ｊが形成されていることから実装面側のカバー６と、ハウジング１の前面１ａとの合わせ目に空隙が形成される。
【００３９】
また、カバー６がハウジング１に取り付けられた際、一対の側面板６ｃは、側壁１ｃの外周部を覆うように配置され、突出片６ｄが突片６ｅの下面を越えて、下方に突出した状態になると共に、切り欠き部６ｆを通して、側面から突片６ｅが目視できるようになっている。
【００４０】
なお、この実施例では、突片６ｅが前面板６ｂの下方隅部に一対設けたもので説明したが、前面板６ｂの下部の任意の箇所において、突片６ｅを１個、或いは２個以上設けても良い。
【００４１】
また、この実施例では、ハウジング１に凸部１ｈ、カバー６に凹部６ｇを設けたもので説明したが、この凹凸部を逆にして、ハウジング１に凹部、カバー６に凸部を設けて、凹凸部による係合関係を構成しても良く、更に、この凹凸部は、１個、或いは複数個設けても良く、その位置も、前面１ａと前面板６ｂの範囲において、適宜箇所に選択して配置しても良い。
【００４２】
なお、凹凸部による係合は、カバー６とハウジング１との組立状態において、初期状態から係合している必要はなく、ハウジング１がその実装面側を支点として傾いた際に係合するように、若干の隙間を設けて挿通しておいても良い。
この場合、凹凸部の最大隙間は、カバー６の孔６ａと操作部材７の外径との隙間よりも小さく設定しておき、即ち、ハウジング１が移動しても、操作部材７と孔６ａとがぶつかる前に凹凸部が係合するように設定する必要がある。
また、初期状態から圧入状態で、凹凸部を設けておいても良い。
【００４３】
合成樹脂の成型品からなる押釦である操作部材７は、操作部７ａと、この操作部７ａの後部に設けられた鍔部７ｂと、操作部７ａの中央部から後方に突出する押圧部７ｃを有し、この操作部材７は、鍔部７ｂと押圧部７ｃが開口部１ｆ内に収納され、操作部７ａが孔６ａから外部に突出ようにして、ハウジング１に対して前後に移動可能に取り付けられている。
【００４４】
この時、凹凸部（凸部１ｈと凹部６ｇ）は、操作部材７の軸線Ｇ（図８参照）よりも上方に位置している。
そして、このような構成を有する本発明の押釦スイッチは、例えば、横寸法が約４．５ｍｍ、高さ寸法が約３．５ｍｍと極めて小く、超小型のもので形成されている。
【００４５】
このような構成を有する本発明の押釦スイッチは、図８に示すように、ハウジング１の底壁１ｂの下面側をプリント基板８に対向させ、第１，第２，第３の端子部２ｃ、３ｃ、４ｃと突片６ｅをプリント基板８上に載置し、第１，第２，第３の端子部２ｃ、３ｃ、４ｃと突片６ｅがプリント基板８上に設けられた導電パターン（図示せず）に半田９付けされて取り付けられて、押釦スイッチがプリント基板８に面実装される。
【００４６】
また、切り欠き部６ｆ、及びハウジング１の段落ち部１ｊによって、実装面でのカバー６とハウジング１の合わせ目に空隙が形成されているので、フラックスの沿面距離を大きく確保できる。
【００４７】
また、押釦スイッチの面実装時、突片６ｅの下端と第１，第２，第３の端子部２ｃ、３ｃ、４ｃの下面とがハウジング１の下面（底壁１ｂ）よりも突出して、ハウジング１の下面（底壁１ｂ）がプリント基板８から浮いた状態となっているため、フラックスがハウジング１の外周面に伝わり難くなって、フラックスが開口部１ｆ内に侵入し難くなると共に、リフロー炉内に通した際に、半田の溶融時間差によって、ハウジング１の下面を中心として押釦スイッチが傾くことがない。
【００４８】
更に、押釦スイッチの面実装時、突出片６ｄは、プリント基板８の孔８ａに挿通され、これによって、プリント基板８に対する押釦スイッチの位置決めを確実に行うようになっている。
【００４９】
そして、操作部材７の操作部７ａがプリント基板８と平行な方向に押圧されると、ドーム状の可動接点５が押されて、可動接点５の中央部が反転動作する。
その結果、可動接点５の外周部が第１，第３の接点部２ａ、４ａに接触した状態で、中央部が移動して第２の接点部３ａに接触して、第１，第３の接点部２ａ、４ａと第２の接点部３ａとの間がＯＮ状態となる。
【００５０】
また、操作部７ａの押圧を解除すると、可動接点５は、自己のバネ性で元の状態に復帰し、これによって、操作部材７も元の状態に戻されると共に、第１，第３の接点部２ａ、４ａと第２の接点部３ａとの間がＯＦＦ状態となる。
【００５１】
そして、本発明の押釦スイッチは、カバー６がプリント基板８に半田付けされて固定された状態で、操作部材７を押圧した際、その押圧方向が図８に示すように矢印Ｐ１方向の場合、操作部材７の上方への移動に伴って、ハウジング１の前面１ａ側がハウジング１の後端角部を支点として上方に移動する。
【００５２】
また、ハウジング１の前面１ａ側の上方への移動は、移動側である前面１ａにおいて、前面板６ｂの凹部６ｇと前面１ａの凸部１ｈとが係合関係となっているために、上方への移動が小さく、このため操作性が良好で、且つ、前面１ａ側の上方への移動の小さな繰り返しであるため、端子部２ｃ、３ｃ、４ｃとプリント基板８との間の半田９の剥がれが少なくなる。
【００５３】
また、ハウジング１の前面１ａに凸部１ｈが設けられ、この凸部１ｈが前面板６ｂの凹部６ｇに嵌合するようにしたため、横方向の寸法を小さくできる。
【００５４】
次に、本発明の押釦スイッチの第１実施例に係る固定接点とハウジングの製造方法を図９，図１０に基づいて説明すると、先ず、図９に示す第１工程で、フープ状の金属板１１は、打ち抜きと突き出し加工が施される。
【００５５】
すると、図９に示すように、第１，第２，第３の固定接点２，３，４は、紙面手前方向に突き出された第１、第２，第３の接点部２ａ、３ａ、４ａが金属板１１の長手方向と直交する短手方向（直線Ｓ１）に一列に配置された状態で、互いに短手方向に並列状態に形成される。
【００５６】
その結果、第１，第２，第３の接点部２ａ、３ａ、４ａのそれぞれから第１，第２，第３の連結部２ｂ、３ｂ、４ｂ、及び第１，第２，第３の端子部２ｃ、３ｃ、４ｃが金属板１１の長手方向（直線Ｓ２，Ｓ３，Ｓ４方向）に平行な状態で延びて配置されている。
【００５７】
即ち、第１、第２，第３の接点部２ａ、３ａ、４ａが金属板１１の長手方向と直交する短手方向（直線Ｓ１）に一列に配置されると、第１、第２，第３の接点部が金属板１１の長手方向に配列されたものに比して、金属板１１を長手方向に短くできて、材料取りが良く、安価な固定接点構造が得られる。
【００５８】
また、第１，第２，第３の端子部２ｃ、３ｃ、４ｃの端部は、金属板１１に連結されると共に、第１，第３の接点部２ａ、４ａの他端は、金属板１１の長手方向に延びる一対の繋ぎ部１２によって金属板１１に繋がれており、また、第１，第３の接点部２ａ、４ａは、第４の連結部Ｒ１で繋がれている。
【００５９】
次に、このような構成を有する金属板１１は、送り孔１３を利用して、順次成型金型（図示せず）に送られ、図１０に示す第２工程で、金属板１１に対して、成形加工によって、図１〜図８で示す構成を有するハウジング１を形成する。
この時、接点部２ａ、４ａの上面、及び側面を金型で囲んで成形し、接点面上への樹脂流入を防止する必要があるが、そのための金型押し当てスペースを、金属板１１の長手方向と直交する方向に設けることができ、長手方向のハウジング１の幅を小さくでき、金属板１１の材料歩留まりを向上させることができる。
【００６０】
すると、第１，第２，第３の固定接点２，３，４の第１，第２，第３の連結部２ｂ、３ｂ、４ｂ、及び第４の連結部Ｒ１と一部の繋ぎ部１２が後壁１ｅに埋設され、第２の接点部３ａが開口部１ｆの中央部（後壁１ｅの中央部）に露出すると共に、第１，第３の接点部２ａ、４ａが第２の接点部３ａを挟んで、開口部１ｆの外周近傍（後壁１ｅの外周）に露出し、且つ、第１，第２，第３の端子部２ｃ、３ｃ、４ｃ、及び繋ぎ部１２がハウジング１外に突出した状態となる。
なお、このインサート成型工程において、第１，第２，第３の連結部２ｂ、３ｂ、４ｂには、金属板１１を板厚方向に打ち抜いた貫通孔１１ａが形成されており、この貫通孔１１ａ内にも樹脂が流入、固化することから、操作時に、端子の引き抜き方向に大きな力が加わっても、スイッチが脱落することが無く、横押し強度を高めることができる。
【００６１】
次に、図１０に示す二点鎖線Ｚ１の位置で切断して、金属板１１から第１，第２，第３の固定接点２，３，４を切り離した後、第１，第２，第３の端子部２ｃ、３ｃ、４ｃがハウジング１の底壁１ｂに沿って折り曲げられると、その製造が完了する。
また、繋ぎ部１２が切断された際、その切断部１２ａは、図３に示すように、上壁１ｄから露出した状態となっている。
【００６２】
また、図１１，図１２は、本発明の押釦スイッチの第２実施例に係る固定接点とハウジングの製造方法を示し、その製造方法を図１１，図１２に基づいて説明すると、先ず、図１１に示す第１工程で、フープ状の金属板１１は、打ち抜きと突き出し加工が施される。
【００６３】
すると、図１１に示すように、第１，第２の固定接点２，３は、突き出された第１、第２の接点部２ａ、３ａが金属板１１の長手方向と直交する短手方向（直線Ｓ１）に一列に配置された状態で、互いに短手方向に並列状態に形成される。
【００６４】
そして、金属板１１の一側部側に形成された第１の固定接点２は、第１の接点部２ａから第１の連結部２ｂ、及び第１の端子部２ｃが金属板１１の長手方向（直線Ｓ２方向）に平行な状態で延びて配置されている。
【００６５】
また、金属板１１の他側部側に形成された第２の固定接点３は、第２の接点部３ａが金属板１１の短手方向の中央部に位置すると共に、第２の端子部３ｃが金属板１１の他側部側で、長手方向（直線Ｓ４方向）に平行な状態で延びて配置され、第２の連結部３ｂが第２の接点部３ａと第２の端子部３ｃに繋がった状態となっている。
【００６６】
即ち、第１、第２の接点部２ａ、３ａが金属板１１の長手方向と直交する短手方向（直線Ｓ１）に一列に配置されると、第１、第２の接点部が金属板１１の長手方向に配列されたものに比して、金属板１１を長手方向に短くできて、材料取りが良く、安価な固定接点構造が得られる。
【００６７】
また、第１，第２の端子部２ｃ、３ｃの端部は、金属板１１に連結されると共に、第１の接点部２ａと第２の端子部３ｃの他端は、金属板１１の長手方向に延びる繋ぎ部１２によって金属板１１に繋がれている。
【００６８】
次に、このような構成を有する金属板１１は、送り孔１３を利用して、順次成型金型（図示せず）に送られ、図１２に示す第２工程で、金属板１１に対して、成形加工によって、図１〜図８で示す構成を有するハウジング１を形成する。
【００６９】
すると、第１，第２の固定接点２，３の第１，第２の連結部２ｂ、３ｂと一部の繋ぎ部１２が後壁１ｅに埋設され、第２の接点部３ａが開口部１ｆの中央部（後壁１ｅの中央部）に露出すると共に、第１の接点部２ａが開口部１ｆの外周近傍（後壁１ｅの外周）に露出し、且つ、第１，第２の端子部２ｃ、３ｃ、及び繋ぎ部１２がハウジング１外に突出した状態となる。
【００７０】
次に、図１２に示す二点鎖線Ｚ１の位置で切断して、金属板１１から第１，第２の固定接点２，３を切り離した後、第１，第２の端子部２ｃ、３ｃがハウジング１の底壁１ｂに沿って折り曲げられると、その製造が完了する。
また、繋ぎ部１２が切断された際、その切断部１２ａは、図３に示すように、上壁１ｄから露出した状態となっている。
【００７１】
また、第２実施例における押釦スイッチの構成は、２個の第１，第２の固定接点２，３を除き、前記第１実施例と同様であり、同一部品に同一番号を付し、ここではその説明を省略する。
【００７２】
【発明の効果】
本発明の押釦スイッチは、前面に開口部を有する絶縁材からなるハウジングと、このハウジングに取り付けられた固定接点と、開口部内に収納された可動接点と、開口部を塞ぐように、ハウジングの前面に配置された前面板を有するカバーと、前面板を貫通して開口部に移動可能に取り付けられ、可動接点を操作する操作部材とを備え、ハウジングの下面は、前面に対して直角状態に位置すると共に、下面は、プリント基板に取付可能な取付面となし、カバーは、プリント基板に取付可能であると共に、ハウジングの前面と前面板との間には、互いに係合可能な凹凸部が設けられ、ハウジングの前面側がプリント基板から離れるように上方に移動した際、凹凸部によって、ハウジングの上方への移動を阻止するようにした構成とした。
このように、ハウジングの前面とカバーの前面板との間には、互いに係合可能な凹凸部が設けられているため、従来に比して、横方向の寸法を小さくできる。また、ハウジングの前面側の上方への移動は、移動側である前面において、凹凸部の係合関係となっているために、上方への移動が小さく、このため操作性が良好で、且つ、前面側の上方への移動の小さな繰り返しであるため、端子部とプリント基板との間の半田の剥がれが少なくなる。
【００７３】
また、凹凸部は、プリント基板を基準にして、操作部材の軸線よりも上方の位置に配置したため、ハウジングの上方への移動を一層小さく、且つ、ハウジングの抜け止めを確実にできる。
【００７４】
また、凹凸部は、合成樹脂からなるハウジングに設けられた凸部と、金属板からなるカバーに設けられた凹部とで構成され、凸部が凹部に嵌合されて係合可能としたため、その構成が簡単で、生産性の良好なものが得られる。
【００７５】
また、固定接点に接続された端子部は、ハウジングから露出した状態で、ハウジングの下面に沿って配置され、端子部とカバーがプリント基板に半田付け可能としたため、面実装の確実なものが得られると共に、ハウジングの下面がプリント基板から浮いた状態となっているため、フラックスがハウジングの外周面に伝わり難くなって、フラックスが開口部内に侵入し難くなると共に、リフロー炉内に通した際に、半田の溶融時間差によって、ハウジングの下面を中心として押釦スイッチが傾くことがない。
【００７６】
また、カバーは、前面板からハウジングの側面側に折り曲げられた側面板と、この側面板に設けられた屈曲部を有し、この屈曲部がハウジングの側面に設けられた凹み部に掛け止めされたため、その構成が簡単であると共に、カバーは、前面板と屈曲部とでハウジングを前後から挟持して、ハウジングに取り付けられ、カバーの取付の確実なものが得られる。
【００７７】
また、カバーの側面板には、プリント基板に挿通可能な突出片が設けられたため、突出片をプリント基板の孔に挿通することによって、プリント基板に対する押釦スイッチの位置決めを確実に行うことができる。
【図面の簡単な説明】
【図１】本発明の押釦スイッチの第１実施例に係る正面図。
【図２】本発明の押釦スイッチの第１実施例に係る側面図。
【図３】本発明の押釦スイッチの第１実施例に係る上面図。
【図４】本発明の押釦スイッチの第１実施例に係る下面図。
【図５】本発明の押釦スイッチの第１実施例に係る要部断面図。
【図６】図５のＡ部分における拡大断面図。
【図７】本発明の押釦スイッチの第１実施例に係る背面図。
【図８】本発明の押釦スイッチの第１実施例に係り、その取付状態を示す説明図。
【図９】本発明の押釦スイッチの第１実施例に係り、固定接点とハウジングの製造の第１工程を示す説明図。
【図１０】本発明の押釦スイッチの第１実施例に係り、固定接点とハウジングの製造の第２工程を示す説明図。
【図１１】本発明の押釦スイッチの第２実施例に係り、固定接点とハウジングの製造の第１工程を示す説明図。
【図１２】本発明の押釦スイッチの第２実施例に係り、固定接点とハウジングの製造の第２工程を示す説明図。
【図１３】従来の押釦スイッチの正面図。
【図１４】従来の押釦スイッチの側面図。
【図１５】従来の押釦スイッチに係り、ハウジングの内部を示す要部断面図。
【符号の説明】
１ハウジング
１ａ前面
１ｂ底壁
１ｃ側壁
１ｄ上壁
１ｅ後壁
１ｆ開口部
１ｈ凸部
１ｊ段落ち部
１ｋ凹み部
２第１の固定接点
２ａ第１の接点部
２ｂ第１の連結部
２ｃ第１の端子部
３第２の固定接点
３ａ第２の接点部
３ｂ第２の連結部
３ｃ第２の端子部
４第３の固定接点
４ａ第３の接点部
４ｂ第３の連結部
４ｃ第３の端子部
Ｒ１第４の連結部
５可動接点
６カバー
６ａ孔
６ｂ前面板
６ｃ側面板
６ｄ突出片
６ｅ凸片
６ｆ切り欠き部
６ｇ凹部
６ｈ屈曲部
７操作部材
７ａ操作部
７ｂ鍔部
７ｃ押圧部
８プリント基板
８ａ孔
９半田
１１金属板
１１ａ貫通孔
１２繋ぎ部
１２ａ切断部
１３送り孔
Ｓ１〜Ｓ４直線
Ｇ軸線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pushbutton switch suitable for use in a surface mounted on a printed circuit board of various electronic devices.
[0002]
[Prior art]
FIG. 13 is a front view of a conventional push button switch, FIG. 14 is a side view of the conventional push button switch, and FIG. 15 is a sectional view of an essential part showing the interior of the housing. FIG.
[0003]
Next, the configuration of a conventional push button switch will be described with reference to FIGS. 13 to 15. A housing 51 made of a synthetic resin molded product has a box shape, and a front surface 51a located on the side and a rear side from the front surface 51a. A bottom wall 51b extending upward, a pair of side walls 51c extending upward from an end of the bottom wall 51b, an upper wall 51d provided between the pair of side walls 51c, a rear wall 51e closing the rear surface, and a front surface 51a It has the opening part 51f provided in the center part, and the trapezoid-shaped convex part 51g provided in the outer surface of a pair of side wall 1c.
[0004]
Each of the first and second fixed contacts 52 and 53 made of a metal plate has contact portions 52a and 53a and terminal portions 52b and 53b. The first and second fixed contacts 52 and 53 are housings. The contact portions 52a and 53a are exposed in the opening 51f on the rear wall 51e, and the terminal portions 52b and 53b are exposed from the rear wall 51e.
[0005]
The lower surfaces of the terminal portions 52b and 53b of the first and second fixed contacts 52 and 53 attached to the housing 51 are arranged so as to be flush with the lower surface of the bottom wall 51b.
[0006]
The dome-shaped movable contact 54 made of rubber has a dome-shaped portion 54a and a contact portion 54b provided at the center of the dome-shaped portion 54a. The movable contact 54 is accommodated in the opening 51f. With the contact portion 54b facing the contact portions 52a and 53a, the dome-shaped portion 54a is attached with the skirt portion in contact with the rear wall 51e.
[0007]
The substantially U-shaped cover 55 made of a metal plate includes a plate-shaped front plate 55b having a hole 55a in the center, a pair of side plates 55c bent at right angles from both ends of the front plate 55b, A pair of bent pieces 55d bent at right angles outward from the lower ends of the side plates 55c, and a recess 55e formed of a trapezoidal hole provided in the pair of side plates 55c.
[0008]
In this cover 55, the front plate 55b is arranged on the front surface 51a of the housing 51 so that the opening 51f is closed by the front plate 55b, the pair of side plates 55c are arranged on the outer peripheral surface of the side wall 51c, and the convex portions are formed in the concave portions 55e. 51g is attached to the housing 51.
[0009]
When the cover 55 is attached to the housing 51, the lower surface of the bent piece 55d is disposed so as to be flush with the lower surface of the bottom wall 51b.
[0010]
The operation member 56, which is a push button made of a synthetic resin molded product, has an operation portion 56a and a flange portion 56b provided at the rear of the operation portion 56a. The operation member 56 has an opening portion 51f with the flange portion 56b. The operation portion 56a is housed in the housing 51 and is attached to the housing 51 so as to be movable back and forth so as to protrude from the hole 55a.
[0011]
As shown in FIGS. 13 and 14, the push button switch having such a configuration is such that the lower surface of the bottom wall 51 b of the housing 51 is placed on the printed circuit board 57, and a pair of bent portions of the terminal portions 52 b and 53 b and the cover 55 are bent. The lower part of the piece 55d and the front plate 55b is soldered and attached to a conductive pattern (not shown) provided on the printed circuit board 57, and the push button switch is surface-mounted on the printed circuit board 57.
[0012]
When the operation portion 56a of the operation member 56 is pressed in a direction parallel to the printed circuit board 57, the dome-shaped portion 54a of the movable contact 54 is pressed and reversely operated.
As a result, the contact portion 54b comes into contact with the contact portions 52a and 53a, and the contact portions 52a and 53a are turned on.
[0013]
Further, when the pressing of the operation portion 56a is released, the dome-shaped portion 54a returns to its original state due to its own springiness, whereby the operation member 56 is also returned to its original state, and between the contact portions 52a and 53a. Is turned off. (For example, see Patent Document 1)
[0014]
However, in the conventional push button switch, when the operation member 56 is pressed with the cover 55 soldered to the printed circuit board 57 and the pressing direction is the direction of the arrow P1, the operation member 56 moves upward. Accordingly, the front surface 51a side of the housing 51 moves upward with the rear end portion (contact portion to the printed circuit board) of the housing 51 as a fulcrum.
[0015]
The upward movement of the housing 51 on the front surface 51a side is such that the concave portion 55e of the side surface plate 55c and the convex portion 51g of the side wall 51c are engaged with each other at the position of the side surface plate 55c away from the front surface 51a on the moving side. Therefore, the upward movement becomes large, so that the operability is poor, and the solder between the terminal portions 52b and 53b and the printed circuit board 57 is caused by repeated large upward movement on the front surface 51a side. Peels off.
[0016]
Moreover, since the convex part 51g was provided in the side wall 51c of the housing 51, and this convex part 51g was made to fit into the recessed part 55e of the side plate 55c, it became large in the horizontal direction.
[0017]
[Patent Document 1]
JP 2002-93272 A
[Problems to be solved by the invention]
The conventional push button switch has a problem that the convex portion 51g is provided on the side wall 51c of the housing 51, and the convex portion 51g is fitted into the concave portion 55e of the side plate 55c, so that the size is increased in the lateral direction.
Further, when the pushbutton switch is attached to the printed circuit board 57, the concave portion 55e of the side plate 55c and the convex portion 51g of the side wall 51c are engaged with each other, so that the housing 51 moves upward on the front surface 51a side. Therefore, there is a problem that the operability is poor and the solder between the terminal portions 52b and 53b and the printed circuit board 57 is peeled off by repeated large movement on the front surface 51a side.
[0019]
SUMMARY OF THE INVENTION An object of the present invention is to provide a pushbutton switch that is small in size, has good operability, and has little solder peeling.
[0020]
[Means for Solving the Problems]
As a first means for solving the above problems, a housing made of an insulating material having an opening on the front surface, a fixed contact attached to the housing, a movable contact accommodated in the opening, and the opening a cover attached to the perforated printed board front plate that is disposed on the housing front to block the part, through the holes formed in the front plate movably attached to the opening portion, the movable An operating member for operating the contact; and an engaging portion including a convex portion provided on the front surface of the housing and an engaging region provided on the front plate of the cover and into which the convex portion is inserted . lower surface, the maximum gap between the printed circuit board can be mounted mounting surface and without, the inner peripheral surface of the engagement region and the convex outer circumferential surface while positioned perpendicular state with respect to the front surface of the housing , Is set to be smaller than the gap between the outer diameter of the operation member and the hole formed in the front plate, when the front side of the housing is moved upwards away from the printed circuit board, wherein said operating member Before the hole of the front plate comes into contact, the convex portion of the engaging portion and the engaging region are engaged to prevent the housing from moving upward.
The housing is made of an insulating material having an opening on the front surface, the fixed contact attached to the housing, the movable contact housed in the opening, and disposed on the front surface of the housing so as to close the opening. A cover having a front plate and attached to a printed circuit board; an operation member that is movably attached to the opening through a hole formed in the front plate and operates the movable contact; and a front of the cover An engaging portion comprising a convex portion provided on the face plate and an engaging region provided on the front surface of the housing and into which the convex portion is inserted, wherein the lower surface of the housing is in a state perpendicular to the front surface of the housing And a mounting surface that can be attached to the printed circuit board, and has a maximum gap between the outer peripheral surface of the convex portion and the inner peripheral surface of the engagement region, and a hole formed in the front plate and the operation portion When the front side of the housing is moved upward away from the printed circuit board, the engagement member and the hole of the front plate come into contact with each other when the front side of the housing moves away from the printed circuit board. The convex portion of the joint portion is engaged with the engagement region to prevent the housing from moving upward.
[0021]
Further, as a second solving means, the engaging portion is arranged at a position above the axis of the operation member with respect to the printed circuit board.
As a third solving means, wherein the engaging portion is composed of said convex portion provided on the housing made of synthetic resin, an insertion hole provided in the cover made of a metal plate, the convex portion Is configured to be loosely fitted so that a gap is formed in the insertion hole , thereby enabling engagement.
[0022]
As a fourth solution, a terminal portion connected to the fixed contact is disposed along the lower surface of the housing in a state exposed from the housing, and the terminal portion and the cover are disposed on the printed circuit board. The configuration is such that soldering is possible.
[0023]
As a fifth solution, the cover has a side plate bent from the front plate toward the side surface of the housing, and a bent portion provided on the side plate. It was set as the structure latched by the recessed part provided in the said side surface.
As a sixth solution, the side plate of the cover is provided with a protruding piece that can be inserted into the printed board.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view according to the first embodiment of the push button switch of the present invention, FIG. 2 is a side view according to the first embodiment of the push button switch of the present invention, and FIG. FIG. 4 is a top view according to the first embodiment of the pushbutton switch of the present invention, and FIG. 4 is a bottom view according to the first embodiment of the pushbutton switch of the present invention.
[0025]
5 is a cross-sectional view of the main part of the first embodiment of the pushbutton switch of the present invention, FIG. 6 is an enlarged cross-sectional view of portion A of FIG. 5, and FIG. 7 is the first embodiment of the pushbutton switch of the present invention. FIG. 8 is a rear view, and FIG. 8 is an explanatory view showing a mounting state of the push button switch according to the first embodiment of the present invention.
[0026]
FIG. 9 relates to the first embodiment of the pushbutton switch of the present invention, and is an explanatory view showing the first step of manufacturing the fixed contact and the housing. FIG. 10 relates to the first embodiment of the pushbutton switch of the present invention, and is fixed. FIG. 11 relates to a second embodiment of the pushbutton switch of the present invention, FIG. 11 is an explanatory view showing the first step of manufacturing the fixed contact and the housing, and FIG. 12 shows the present invention. It is explanatory drawing which shows the 2nd process of manufacture of a stationary contact and a housing in connection with 2nd Example of this pushbutton switch.
[0027]
Next, the structure of the first embodiment of the pushbutton switch of the present invention will be described with reference to FIGS. 1 to 8. The housing 1 made of a synthetic resin molded product has a box shape and is located on the side 1a. A bottom wall 1b extending rearward from the front surface 1a, a pair of side walls 1c extending upward from an end portion of the bottom wall 1b, an upper wall 1d provided between the pair of side walls 1c, and a rear wall covering the rear surface 1e, an opening 1f provided at the center of the front surface 1a, and a convex portion 1h made of a protrusion provided on the front surface 1a.
[0028]
Further, a notched stepped portion 1j is formed at the corners facing the front surface 1a, the bottom wall 1b, and the side wall 1c, and at the upper and lower corners of the rear part of the pair of opposing side walls 1c. The recess 1k is provided to form a stepped portion.
[0029]
Each of the first, second, and third fixed contacts 2, 3, and 4 made of a metal plate has a first contact portion 2a, a second contact portion 3a, The third contact portion 4a, and the first connecting portion 2b, the second connecting portion 3b, and the third connecting portion connected to each of the first, second, and third contact portions 2a, 3a, and 4a. 4b, and a first terminal portion 2c, a second terminal portion 3c, and a third terminal portion 4c connected to each of the first, second, and third connecting portions 2b, 3b, and 4b.
[0030]
The first, second, and third contact portions 2a, 3a, and 4a of the first, second, and third fixed contacts 2, 3, and 4 are arranged on a straight line S1, as shown in FIG. And the first, second, and third contact portions 2a, 3a, and 4a to the first, second, and third connecting portions 2b, 3b, and 4b, and the first, second, and third terminals, respectively. The parts 2c, 3c, 4c are arranged extending in the direction of the straight lines S2, S3, S4 orthogonal to the straight line S1.
[0031]
As a result, the first, second, and third connecting portions 2b, 3b, and 4b and the first, second, and third terminal portions 2c, 3c, and 4c are arranged in parallel with each other.
In this embodiment, the first and third fixed contacts 2 and 4 are connected by the fourth connecting portion R1, and each is used as a common contact, thereby improving the reliability as a switch. The fourth connecting portion R1 may be eliminated.
[0032]
The first, second, and third fixed contacts 2, 3, and 4 have the first, second, and third connecting portions 2b, 3b, and 4b, and the fourth connecting portion R1 embedded in the rear wall 1e. The second contact portion 3a is exposed at the center portion of the opening 1f (the center portion of the rear wall 1e), and the first and third contact portions 2a and 4a connect the second contact portion 3a. It is sandwiched and exposed in the vicinity of the outer periphery of the opening 1f (the outer periphery of the rear wall 1e).
[0033]
The first, second, and third terminal portions 2c, 3c, and 4c protrude outward from the bottom wall 1b of the housing 1, and are rearward along the lower surface of the bottom wall 1b that is a terminal portion lead-out surface. The lower surfaces of the bent first, second, and third terminal portions 2c, 3c, and 4c are positioned lower than the lower surface of the bottom wall 1b. (See especially Figure 6)
[0034]
In this embodiment, the three first, second, and third fixed contacts 2, 3, and 4 are used. However, the two first, second fixed contacts 2, 3, and 4 are used. Alternatively, the second and third fixed contacts 3 and 4 may be used.
[0035]
The movable contact 5 made of a metal plate or the like having a dome-like shape is accommodated in the opening 1f of the housing 1, and as shown in FIG. 5, the central portion faces the second contact portion 3a and the outer peripheral portion is The first and third contact portions 2a and 4a are arranged in contact with each other.
[0036]
The cover 6, which is made of a metal plate and is substantially U-shaped, has a plate-like front plate 6 b having a hole 6 a in the center, and a pair of side plates 6 c bent backward at right angles from both ends of the front plate 6 b. A pair of projecting pieces 6d projecting downward from the lower ends of the pair of side plates 6c, a pair of projecting pieces 6e provided at the left and right lower corners of the front plate 6b, and a position facing the projecting pieces 6e, A notch 6f provided in the pair of side plates 6c, a recess 6g formed of a small hole provided in the upper corner of the front plate 6b, and a bent portion 6h provided on the upper and lower sides of the pair of side plates 6c. Have.
And the recessed part 6g is located above the center part of the hole 6a, and is provided.
[0037]
In this cover 6, the front plate 6b is disposed on the front surface 1a of the housing 1 so as to block the opening 1f with the front plate 6b, and the convex portion 1h of the housing 1 is inserted into the concave portion 6g. The tongue piece provided at the rear part of the pair of side plates 6c is bent so as to be fitted into the recessed portion 1k, and a bent portion 6h hooked to the recessed portion 1k is formed. It is attached to the housing 1.
That is, the cover 6 is attached to the housing 1 with the front panel 6b and the bent portion 6h sandwiching the housing 1 from the front and rear.
[0038]
When the cover 6 is attached to the housing 1, the projecting piece 6e is disposed in the stepped portion 1j, and the lower surface of the projecting piece 6e is located below the lower surface of the bottom wall 1b. The first, second and third terminal portions 2c, 3c and 4c are flush with the lower surface.
At this time, since the stepped portion 1j is formed at both corners of the housing 1 where the back surfaces of the protruding piece 6e and the protruding piece 6d face each other, the mounting surface side cover 6 and the front surface 1a of the housing 1 A void is formed at the joint.
[0039]
Further, when the cover 6 is attached to the housing 1, the pair of side plates 6c are arranged so as to cover the outer peripheral portion of the side wall 1c, and the protruding piece 6d protrudes downward beyond the lower surface of the protruding piece 6e. In addition, the protruding piece 6e can be seen from the side surface through the notch 6f.
[0040]
In this embodiment, the pair of protruding pieces 6e are provided at the lower corner of the front plate 6b. However, one or two or more protruding pieces 6e are provided at an arbitrary position below the front plate 6b. It may be provided.
[0041]
In this embodiment, the housing 1 has been described with the convex portion 1h and the cover 6 with the concave portion 6g. However, the concave and convex portion is reversed, and the housing 1 has the concave portion and the cover 6 has the convex portion. The engagement relationship by the concavo-convex portion may be configured. Further, one or a plurality of the concavo-convex portions may be provided, and the position thereof is selected as appropriate in the range of the front surface 1a and the front plate 6b. May be arranged.
[0042]
Note that the engagement by the concavo-convex portion does not need to be engaged from the initial state in the assembled state of the cover 6 and the housing 1, and is engaged when the housing 1 is inclined with the mounting surface side as a fulcrum. In addition, it may be inserted with a slight gap.
In this case, the maximum gap between the concave and convex portions is set smaller than the gap between the hole 6a of the cover 6 and the outer diameter of the operation member 7, that is, even if the housing 1 moves, the operation member 7 and the hole 6a It is necessary to set the concavo-convex portion to be engaged before the bumps collide.
Moreover, you may provide an uneven | corrugated | grooved part in the press-fit state from an initial state.
[0043]
The operating member 7 which is a push button made of a synthetic resin molded product includes an operating portion 7a, a collar portion 7b provided at the rear portion of the operating portion 7a, and a pressing portion 7c protruding rearward from the central portion of the operating portion 7a. The operating member 7 is attached to the housing 1 so that the collar 7b and the pressing portion 7c are accommodated in the opening 1f, and the operating portion 7a protrudes outward from the hole 6a. It has been.
[0044]
At this time, the concavo-convex portions (the convex portions 1h and the concave portions 6g) are located above the axis G (see FIG. 8) of the operation member 7.
The pushbutton switch of the present invention having such a configuration is formed with a very small size, for example, a lateral dimension of about 4.5 mm and a height dimension of about 3.5 mm.
[0045]
As shown in FIG. 8, the pushbutton switch of the present invention having such a configuration has the lower surface side of the bottom wall 1b of the housing 1 opposed to the printed circuit board 8, and the first, second, and third terminal portions 2c, 3c, 4c and the protruding piece 6e are placed on the printed circuit board 8, and the first, second and third terminal portions 2c, 3c, 4c and the protruding piece 6e are provided on the printed circuit board 8 (see FIG. The push button switch is surface-mounted on the printed circuit board 8 by being attached to the solder 9 (not shown).
[0046]
Further, since the gap is formed at the joint between the cover 6 and the housing 1 on the mounting surface by the notch 6f and the stepped portion 1j of the housing 1, a large creepage distance of the flux can be secured.
[0047]
When the pushbutton switch is mounted on the surface, the lower end of the projecting piece 6e and the lower surfaces of the first, second, and third terminal portions 2c, 3c, and 4c protrude from the lower surface (bottom wall 1b) of the housing 1, thereby 1 is in a state where the lower surface (bottom wall 1 b) is floating from the printed circuit board 8, it becomes difficult for the flux to be transmitted to the outer peripheral surface of the housing 1, making it difficult for the flux to enter the opening 1 f and the reflow furnace. When passing through, the push button switch does not tilt around the lower surface of the housing 1 due to the difference in melting time of the solder.
[0048]
Further, when the push button switch is mounted on the surface, the protruding piece 6d is inserted into the hole 8a of the printed circuit board 8, so that the push button switch is reliably positioned with respect to the printed circuit board 8.
[0049]
When the operation portion 7a of the operation member 7 is pressed in a direction parallel to the printed circuit board 8, the dome-shaped movable contact 5 is pressed, and the central portion of the movable contact 5 is reversed.
As a result, in the state where the outer peripheral portion of the movable contact 5 is in contact with the first and third contact portions 2a and 4a, the central portion is moved to contact the second contact portion 3a, and the first and third contacts The contact portions 2a, 4a and the second contact portion 3a are in the ON state.
[0050]
Further, when the pressing of the operation portion 7a is released, the movable contact 5 returns to its original state due to its own springiness, whereby the operation member 7 is also returned to its original state, and the first and third contacts The portion 2a, 4a and the second contact portion 3a are in the OFF state.
[0051]
The pushbutton switch according to the present invention, when the operating member 7 is pressed in a state where the cover 6 is soldered and fixed to the printed circuit board 8, the pressing direction is the direction of the arrow P1 as shown in FIG. As the operating member 7 moves upward, the front surface 1a side of the housing 1 moves upward with the rear end corner of the housing 1 as a fulcrum.
[0052]
Further, the upward movement of the housing 1 on the front surface 1a side is upward because the concave portion 6g of the front plate 6b and the convex portion 1h of the front surface 1a are in an engaging relationship on the front surface 1a on the moving side. Therefore, the operability is good, and the upward movement of the front surface 1a is repeated repeatedly, so that the solder 9 is peeled off between the terminal portions 2c, 3c, 4c and the printed circuit board 8. Less.
[0053]
Moreover, since the convex part 1h was provided in the front surface 1a of the housing 1, and this convex part 1h was made to fit into the recessed part 6g of the front plate 6b, the dimension of a horizontal direction can be made small.
[0054]
Next, a method for manufacturing the fixed contact and the housing according to the first embodiment of the pushbutton switch of the present invention will be described with reference to FIGS. 9 and 10. First, in the first step shown in FIG. No. 11 is punched and extruded.
[0055]
Then, as shown in FIG. 9, the first, second, and third fixed contacts 2, 3, 4 protrude from the first, second, and third contact portions 2 a, 3 a, 4 a that protrude in the front direction of the paper. Are arranged in a row in a short direction (straight line S1) perpendicular to the longitudinal direction of the metal plate 11, and are formed in parallel with each other in the short direction.
[0056]
As a result, the first, second, and third contact portions 2a, 3a, and 4a, the first, second, and third connection portions 2b, 3b, and 4b, and the first, second, and third terminals, respectively. The parts 2c, 3c, and 4c are arranged to extend in a state parallel to the longitudinal direction of the metal plate 11 (straight line S2, S3, S4 direction).
[0057]
That is, when the first, second, and third contact portions 2a, 3a, and 4a are arranged in a line in the short direction (straight line S1) orthogonal to the longitudinal direction of the metal plate 11, the first, second, and second contacts are arranged. The metal plate 11 can be shortened in the longitudinal direction as compared with the case where the three contact portions are arranged in the longitudinal direction of the metal plate 11, and a fixed contact structure can be obtained with good material handling and low cost.
[0058]
The end portions of the first, second, and third terminal portions 2c, 3c, and 4c are connected to the metal plate 11, and the other ends of the first and third contact portions 2a and 4a are connected to the metal plate. 11 is connected to the metal plate 11 by a pair of connecting portions 12 extending in the longitudinal direction, and the first and third contact portions 2a, 4a are connected by a fourth connecting portion R1.
[0059]
Next, the metal plate 11 having such a configuration is sequentially sent to a molding die (not shown) using the feed holes 13, and is then applied to the metal plate 11 in the second step shown in FIG. The housing 1 having the configuration shown in FIGS. 1 to 8 is formed by molding.
At this time, it is necessary to surround and mold the upper and side surfaces of the contact portions 2a and 4a with a mold to prevent the resin from flowing into the contact surface. It can be provided in a direction orthogonal to the longitudinal direction, the width of the housing 1 in the longitudinal direction can be reduced, and the material yield of the metal plate 11 can be improved.
[0060]
Then, the first, second, and third fixed contacts 2, 3, 4, the first, second, and third connecting portions 2 b, 3 b, 4 b, the fourth connecting portion R 1, and a part of the connecting portion 12. Is embedded in the rear wall 1e, the second contact portion 3a is exposed at the center of the opening 1f (the center of the rear wall 1e), and the first and third contact portions 2a, 4a are the second contacts. The first and second terminal portions 2c, 3c, and 4c and the connecting portion 12 are outside the housing 1 and are exposed in the vicinity of the outer periphery of the opening 1f (the outer periphery of the rear wall 1e) with the portion 3a interposed therebetween. It will be in the state of protruding.
In this insert molding step, the first, second, and third connecting portions 2b, 3b, and 4b are formed with through holes 11a formed by punching the metal plate 11 in the thickness direction. Since the resin flows into the inside and solidifies, even when a large force is applied in the direction of pulling out the terminal during operation, the switch does not fall off and the lateral pushing strength can be increased.
[0061]
Next, after cutting at the position of the two-dot chain line Z1 shown in FIG. 10 and separating the first, second, and third fixed contacts 2, 3, and 4 from the metal plate 11, the first, second, and second When the three terminal portions 2c, 3c, and 4c are bent along the bottom wall 1b of the housing 1, the manufacturing is completed.
When the connecting portion 12 is cut, the cut portion 12a is exposed from the upper wall 1d as shown in FIG.
[0062]
11 and 12 show a method of manufacturing the fixed contact and the housing according to the second embodiment of the pushbutton switch of the present invention. The manufacturing method will be described with reference to FIGS. 11 and 12. First, FIG. The hoop-shaped metal plate 11 is stamped and extruded in the first step shown in FIG.
[0063]
Then, as shown in FIG. 11, the first and second fixed contacts 2 and 3 are protruded in the short direction in which the protruding first and second contact portions 2 a and 3 a are orthogonal to the longitudinal direction of the metal plate 11 ( In a state of being arranged in a line on the straight line S1), they are formed in parallel with each other in the lateral direction.
[0064]
The first fixed contact 2 formed on one side of the metal plate 11 has the first contact portion 2 a to the first connecting portion 2 b and the first terminal portion 2 c in the longitudinal direction of the metal plate 11. It is arranged extending in a state parallel to (straight line S2 direction).
[0065]
The second fixed contact 3 formed on the other side of the metal plate 11 has the second contact portion 3a located at the center in the short direction of the metal plate 11 and the second terminal portion 3c. Is arranged on the other side of the metal plate 11 so as to extend parallel to the longitudinal direction (straight line S4 direction), and the second connecting portion 3b is connected to the second contact portion 3a and the second terminal portion 3c. It is in the state.
[0066]
That is, when the first and second contact portions 2a and 3a are arranged in a line in a short direction (straight line S1) perpendicular to the longitudinal direction of the metal plate 11, the first and second contact portions are formed in the metal plate 11. The metal plate 11 can be shortened in the longitudinal direction as compared with those arranged in the longitudinal direction, and a fixed contact structure can be obtained with good material removal and low cost.
[0067]
In addition, the end portions of the first and second terminal portions 2 c and 3 c are connected to the metal plate 11, and the other ends of the first contact portion 2 a and the second terminal portion 3 c are the length of the metal plate 11. It is connected to the metal plate 11 by a connecting portion 12 extending in the direction.
[0068]
Next, the metal plate 11 having such a configuration is sequentially sent to a molding die (not shown) using the feed holes 13, and is applied to the metal plate 11 in the second step shown in FIG. The housing 1 having the configuration shown in FIGS. 1 to 8 is formed by molding.
[0069]
Then, the first and second connecting portions 2b and 3b of the first and second fixed contacts 2 and 3 and a part of the connecting portion 12 are embedded in the rear wall 1e, and the second contact portion 3a is opened to the opening 1f. And the first contact portion 2a is exposed in the vicinity of the outer periphery of the opening 1f (the outer periphery of the rear wall 1e), and the first and second terminal portions. 2c, 3c, and the connection part 12 will be in the state which protruded out of the housing 1. FIG.
[0070]
Next, after cutting at the position of the two-dot chain line Z1 shown in FIG. 12 and separating the first and second fixed contacts 2 and 3 from the metal plate 11, the first and second terminal portions 2c and 3c are When it is bent along the bottom wall 1b of the housing 1, its manufacture is completed.
When the connecting portion 12 is cut, the cut portion 12a is exposed from the upper wall 1d as shown in FIG.
[0071]
The configuration of the pushbutton switch in the second embodiment is the same as that of the first embodiment except for the two first and second fixed contacts 2 and 3. Then, the explanation is omitted.
[0072]
【The invention's effect】
The pushbutton switch of the present invention includes a housing made of an insulating material having an opening on the front surface, a fixed contact attached to the housing, a movable contact housed in the opening, and a front surface of the housing so as to close the opening. A cover having a front plate disposed on the housing, and an operation member that is movably attached to the opening through the front plate and operates the movable contact, and the lower surface of the housing is positioned at a right angle to the front surface. In addition, the lower surface is a mounting surface that can be attached to the printed circuit board, the cover can be attached to the printed circuit board, and an uneven portion that can be engaged with each other is provided between the front surface of the housing and the front plate. Thus, when the front side of the housing moves upward away from the printed circuit board, the upward and downward movement of the housing is prevented by the uneven portion.
Thus, since the uneven | corrugated | grooved part which can mutually engage is provided between the front surface of the housing and the front plate of the cover, the dimension of a horizontal direction can be made small compared with the past. Further, the upward movement of the front surface side of the housing is an engagement relationship of the concavo-convex portions on the front surface on the moving side, so that the upward movement is small, and thus the operability is good, and Since it is a small repetition of the upward movement of the front side, the peeling of the solder between the terminal portion and the printed board is reduced.
[0073]
In addition, since the concavo-convex portion is disposed at a position above the axis of the operation member with respect to the printed circuit board, the upward movement of the housing can be further reduced and the housing can be reliably prevented from coming off.
[0074]
In addition, the concavo-convex part is composed of a convex part provided in the housing made of synthetic resin and a concave part provided in the cover made of a metal plate, and the convex part is fitted into the concave part and can be engaged. A product with a simple structure and good productivity can be obtained.
[0075]
In addition, the terminal part connected to the fixed contact is arranged along the lower surface of the housing in a state exposed from the housing, and the terminal part and the cover can be soldered to the printed circuit board. In addition, since the lower surface of the housing is in a state of floating from the printed circuit board, it is difficult for the flux to be transmitted to the outer peripheral surface of the housing, and it is difficult for the flux to enter the opening, and when it passes through the reflow furnace. The push button switch does not tilt around the lower surface of the housing due to the difference in melting time of the solder.
[0076]
The cover has a side plate bent from the front plate to the side surface of the housing, and a bent portion provided on the side plate, and the bent portion is latched by a recessed portion provided on the side surface of the housing. Therefore, the structure is simple, and the cover is attached to the housing by sandwiching the housing from the front and the back by the front plate and the bent portion, and the cover can be securely attached.
[0077]
Further, since the side plate of the cover is provided with a protruding piece that can be inserted into the printed board, the push button switch can be reliably positioned with respect to the printed board by inserting the protruding piece into the hole of the printed board.
[Brief description of the drawings]
FIG. 1 is a front view according to a first embodiment of a pushbutton switch of the present invention.
FIG. 2 is a side view according to the first embodiment of the pushbutton switch of the present invention.
FIG. 3 is a top view according to the first embodiment of the pushbutton switch of the present invention.
FIG. 4 is a bottom view according to the first embodiment of the pushbutton switch of the present invention.
FIG. 5 is a cross-sectional view of an essential part according to the first embodiment of the pushbutton switch of the present invention.
6 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 7 is a rear view according to the first embodiment of the pushbutton switch of the present invention.
FIG. 8 is an explanatory diagram showing a mounting state of the push button switch according to the first embodiment of the present invention.
FIG. 9 is an explanatory view showing a first step of manufacturing a fixed contact and a housing according to the first embodiment of the pushbutton switch of the present invention.
FIG. 10 is an explanatory view showing a second step of manufacturing the fixed contact and the housing according to the first embodiment of the pushbutton switch of the present invention.
FIG. 11 is an explanatory view showing a first step of manufacturing a fixed contact and a housing according to a second embodiment of the pushbutton switch of the present invention.
FIG. 12 is an explanatory view showing a second step of manufacturing the fixed contact and the housing according to the second embodiment of the pushbutton switch of the present invention.
FIG. 13 is a front view of a conventional push button switch.
FIG. 14 is a side view of a conventional push button switch.
FIG. 15 is a cross-sectional view of the main part showing the inside of a housing according to a conventional push button switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 1a Front surface 1b Bottom wall 1c Side wall 1d Upper wall 1e Rear wall 1f Opening part 1h Protruding part 1j Stepped part 1k Recessed part 2 1st fixed contact 2a 1st contact part 2b 1st connection part 2c 1st connection part Terminal portion 3 Second fixed contact 3a Second contact portion 3b Second connecting portion 3c Second terminal portion 4 Third fixed contact 4a Third contact portion 4b Third connecting portion 4c Third terminal portion R1 4th connecting portion 5 movable contact 6 cover 6a hole 6b front plate 6c side plate 6d protruding piece 6e protruding piece 6f notched portion 6g recessed portion 6h bending portion 7 operating member 7a operating portion 7b flange portion 7c pressing portion 8 printed board 8a Hole 9 Solder 11 Metal plate 11a Through hole 12 Connecting portion 12a Cutting portion 13 Feed holes S1 to S4 Straight line G Axis line

Claims

A housing made of an insulating material having an opening on the front surface, a fixed contact attached to the housing, a movable contact housed in the opening, and a front plate disposed on the front of the housing so as to close the opening a cover attached to the printed circuit board have a movably mounted to the opening portion through the hole formed in the front plate, an operating member for operating the movable contact, provided on a front face of the housing And an engaging portion that is provided on the front plate of the cover and includes an engaging region into which the protruding portion is inserted, and the lower surface of the housing is positioned at a right angle to the front surface of the housing outside of the printed circuit board can be mounted mounting surface and without up gaps, formed in the front plate the hole and the operating member between the inner peripheral surface of the said convex outer circumferential surface engaging areas while Is set to be smaller than the gap between the, when the front side of the housing is moved upwards away from the printed circuit board, and the holes in the front plate and the operating member prior to contacting, the engagement portion A pushbutton switch characterized in that a convex portion and an engagement region are engaged to prevent the housing from moving upward.

A housing made of an insulating material having an opening on the front surface, a fixed contact attached to the housing, a movable contact housed in the opening, and a front plate disposed on the front of the housing so as to close the opening A cover attached to the printed circuit board, an operation member that is movably attached to the opening through a hole formed in the front plate, and that operates the movable contact; and a front plate of the cover And an engaging portion that is provided on the front surface of the housing and includes an engaging region into which the convex portion is inserted, and the lower surface of the housing is positioned at a right angle to the front surface of the housing. And an attachment surface that can be attached to the printed circuit board, and a maximum gap between the outer peripheral surface of the convex portion and the inner peripheral surface of the engagement region is formed outside the hole formed in the front plate and the operation member. When the front side of the housing is moved upward away from the printed circuit board, before the operation member and the hole of the front plate come into contact with each other, A pushbutton switch characterized in that a convex portion and an engagement region are engaged to prevent the housing from moving upward.

3. The push button switch according to claim 1, wherein the engaging portion is disposed at a position above the axis of the operation member with respect to the printed circuit board.

The engagement portion, said convex portion provided on the housing made of synthetic resin is composed of an insertion hole provided in the cover made of a metal plate, the protrusion gap is formed in the insertion hole The pushbutton switch according to claim 1 or 3 , wherein the pushbutton switch is loosely fitted so as to be engageable.

The terminal portion connected to the fixed contact is disposed along the lower surface of the housing in a state of being exposed from the housing, and the terminal portion and the cover can be soldered to the printed circuit board. The pushbutton switch according to any one of claims 1 to 4 .

The cover has a side plate that is bent from the front plate toward the side surface of the housing, and a bent portion provided on the side plate, and the bent portion is formed in a recess provided on the side surface of the housing. push button switch according to any one of claims 1 to 5, characterized in that it is latched.

The pushbutton switch according to any one of claims 1 to 6 , wherein the side plate of the cover is provided with a protruding piece that can be inserted into the printed circuit board.