JP2004111148A

JP2004111148A - Push button switch and mounting structure therefor

Info

Publication number: JP2004111148A
Application number: JP2002270277A
Authority: JP
Inventors: Naoki Hanawa; 花輪　直樹
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2002-09-17
Filing date: 2002-09-17
Publication date: 2004-04-08
Also published as: CN1242438C; CN1490833A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-profile push button switch easily attached to electric apparatus, and to provide a mounting structure for push button switch for making it easy to attach a push button switch to an electric apparatus. <P>SOLUTION: This push button switch 1A comprises a substrate 1 having first to third fixed contacts 2, 3, and 4, a first conductive inverting spring 5 normally connected electrically to the first fixed contact 2 and, when it is inverted, electrically connected to the second fixed contact 3, a second conductive inverting spring 6 normally connected electrically to the third fixed contact 4 and, when it is inverted, electrically connected to the first inverting spring 5, a dustproof sheet 7, and a frame 8 for operatively holding the inverting spring 6 between itself and the substrate 1. An operation part 6 of the inverting spring 6 is disposed above the upper surface of the frame 8. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、押釦スイッチとその取付構造とに係り、特に、オートフォーカス機能を備えたカメラなどに組み込まれる２段動作スイッチの構成と、カメラなどの電気機器の筐体に対する２段動作スイッチの取付構造とに関する。
【０００２】
【従来の技術】
図８に、従来より知られているこの種の押釦スイッチの一例を示す。この図から明らかなように、本例の押釦スイッチは、浅底の箱形状を有するベース１０１と、当該ベース１０１の所定の位置に設定された外周固定接点１０２、中央固定接点１０３及び共通固定接点１０４と、前記外周固定接点１０２と常時電気的に接続され、反転時に前記中央固定接点１０３と電気的に接続される導電性皿状反転バネ１０５と、前記共通固定接点１０４と常時電気的に接続され、動作時に前記導電性皿状反転バネ１０５と電気的に接続されるリーフバネ１０６と、当該リーフバネ１０６に形成された可動舌片１０７を押圧する樹脂バネフィルム１０８と、前記ベース１０１の開口部に被着された防塵用のゴムシート１０９と、当該ゴムシート１０９の外面に被着された金属板製のカバー１１０とから構成されており、前記カバー１１０の中央部には、外部より前記ゴムシート１０９を介して前記樹脂バネフィルム１０８を押圧操作するための操作孔１１１が開設されている。なお、この種の押釦スイッチとしては、特開２００２−１２４１５３に開示された２段動作スイッチなどを挙げることができる。
【０００３】
本例の押釦スイッチは、非操作時においては、図８に示すように、導電性皿状反転バネ１０５が上向きに湾曲して外周固定接点１０２と中央固定接点１０３とが電気的に切離されている。また、樹脂バネフィルム１０８も上向きに湾曲していて可動舌片１０７が非動作状態にあり、外周固定接点１０２及び中央固定接点１０３と共通固定接点１０４とが電気的に切離されている。
【０００４】
この押釦スイッチの接点切替は、ゴムシート１０９の外面中央部に先端部が当接された図示しないキートップを押圧操作することによって行われる。即ち、図示しないキートップが押圧されると、樹脂バネフィルム１０８の中央部分が下向きに湾曲されてリーフバネ１０６の可動舌片１０７が下向きに弾性変形される。そして、可動舌片１０７と導電性皿状反転バネ１０５とが接触した段階で外周固定接点１０２と共通固定接点１０４とが導通し、第１の接点切替状態になる。また、この状態からさらに図示しないキートップを押圧すると、その押圧力によって導電性皿状反転バネ１０５が下向きに反転し、導電性皿状反転バネ１０５とリーフバネ１０６とを介して外周固定接点１０２、中央固定接点１０３及び共通固定接点１０４が導通し、第２の接点切替状態になる。
【０００５】
第１の接点切替状態又は第２の接点切替状態からキートップに加えられていた押圧力を除けば、導電性皿状反転バネ１０５、リーフバネ１０６、樹脂バネフィルム１０８及びゴムシート１０９の弾性力により、図８に示す非操作状態に自動的に復帰する。
【０００６】
【発明が解決しようとする課題】
しかしながら、前記従来例に係る押釦スイッチは、可動舌片１０７よりも上方に樹脂バネフィルム１０８とゴムシート１０９とカバー１１０とが配置されているので、押釦スイッチの全高Ｈが大きく、当該押釦スイッチが備えられる電気機器に大きなスイッチ設定スペースを必要とするという不都合がある。
【０００７】
また、この種の押釦スイッチは、電気機器の筐体に備えられるキートップの動揺を防止し、押釦スイッチの使用感を良好なものにするため、キートップをゴムシート１０９の外面に弾接して樹脂バネフィルム１０８に予圧をかける必要があるが、前記従来例に係る押釦スイッチは、可動舌片１０７の上方にカバー１１０を配置し、当該カバー１１０の中央部に開設された操作孔１１１を通してキートップの下端部をゴムシート１０９の外面中央部に当接する構成であるので、電気機器への組み込み時、まず、電気機器に設けられたスイッチ設定スペース内に押釦スイッチを収納して外周固定接点１０２、中央固定接点１０３及び共通固定接点１０４を電気機器に備えられた電気回路と接続し、しかる後に、スイッチ設定スペースの上方よりキートップが弾性保持されたカバー部材を電気機器の筐体を被着し、キートップの下端部をゴムシート１０９の外面中央部に弾接するか、或いは、電気機器の筐体に予めキートップを弾性保持しておき、当該キートップの下端部側から押釦スイッチを上昇させてキートップの下端部をゴムシート１０９の外面中央部に弾接し、しかる後に、外周固定接点１０２、中央固定接点１０３及び共通固定接点１０４を電気機器に備えられた電気回路と接続するという方法を採らなくてはならず、電気機器に対する押釦スイッチの組立工程が複雑で、電気機器のレイアウトも制限されるという不都合がある。
【０００８】
本発明は、かかる技術的課題を解決するためになされたものであり、その目的とするところは、薄形にして電気機器への取り付けが容易な押釦スイッチを提供すること、及び電気機器に対する押釦スイッチの取り付けを容易化できる押釦スイッチの取付構造を提供することにある。
【０００９】
【課題を解決するための手段】
本発明は、前記の課題を解決するため、押釦スイッチに関しては、第１乃至第３の固定接点を有する基体と、前記第１の固定接点と常時電気的に接続され、反転時に前記第２の固定接点と電気的に接続される第１の導電性反転ばねと、前記第３の固定接点と常時電気的に接続され、反転時に前記第１の導電性反転ばねと電気的に接続される第２の導電性反転ばねと、前記基体との間で前記第２の導電性反転ばねを動作可能に保持するフレームとを備え、前記第２の導電性反転ばねの操作部を前記フレームに開設されたキートップ挿通孔内に設定し、かつ前記第２の導電性反転ばねの操作部を前記フレームの上面よりも上方に配置するという構成にした。
【００１０】
このように、押釦スイッチを、第１乃至第３の固定接点を有する基体と、第１及び第２の導電性反転ばねと、フレームとから構成すると、従来例に係る押釦スイッチに備えられていたリーフバネを省略できるので、押釦スイッチの薄形化を図ることができる。また、第２の導電性反転ばねの操作部をフレームに開設されたキートップ挿通孔内に設定し、かつ当該第２の導電性反転ばねの操作部をフレームの上面よりも上方に配置すると、第２の導電性反転ばねの上方にフレームが配置されないので、この点からも押釦スイッチの薄形化を図ることができる。さらに、第２の導電性反転ばねの操作部をフレームに開設されたキートップ挿通孔内に設定し、かつ当該第２の導電性反転ばねの操作部をフレームの上面よりも上方に配置したことから、電気機器の筐体に弾性保持されたキートップの下端部をフレームの上面に当接した状態で押釦スイッチをキートップの操作方向に対して直交する方向から筐体内に挿入することによって、自動的に第２の導電性反転ばねに予圧をかけることができ、電気機器に対する押釦スイッチの組み込み工程の簡略化が図れると共に、電気機器における押釦スイッチ設定スペース周りのレイアウトの自由度を高めることができる。
【００１１】
また、本発明は、前記構成の押釦スイッチにおいて、前記第２の導電性反転ばねの上面を防塵シートで覆い、当該防塵シートの表面を前記フレームに開設されたキートップ挿通孔を通して前記フレームの上面よりも上方に配置するという構成にした。
【００１２】
このように、第２の導電性反転ばねの上面を防塵シートで覆うと、スイッチ装置内への塵埃等の異物の侵入を防止できるので、押釦スイッチの耐久性を高めることができる。
【００１３】
また、本発明は、前記構成の押釦スイッチにおいて、前記第２の導電性反転ばねの少なくとも一部に断面形状が円弧状をなす膨出部を形成してその頂上部分を前記操作部となし、前記フレームに開設されたキートップ挿通孔の開口端に前記膨出部を直接又は前記防塵シートを介して当接するという構成にした。
【００１４】
このように、第２の導電性反転ばねに円弧状の膨出部を形成し、フレームに開設されたキートップ挿通孔の開口端に当該膨出部を当接すると、電気機器への押釦スイッチの組み込み時、電気機器の筐体に弾性保持されたキートップの下端部をフレームの上面に当接した状態から押釦スイッチをキートップの操作方向に対して直交する方向に移動させたときに、キートップの下端部をフレーム上から第２の導電性反転ばねの膨出部上に円滑に移動させることができるので、電気機器に対する押釦スイッチの組み込みを円滑に行うことができる。
【００１５】
また、本発明は、前記構成の押釦スイッチにおいて、前記第２の導電性反転ばねの膨出部をドーム状に形成するという構成にした。
【００１６】
このように、第２の導電性反転ばねの膨出部をドーム状に形成すると、電気機器への押釦スイッチの組み込み時に、キートップに対する第２の導電性反転ばねの移動方向に方向性をなくすことができるので、電気機器に対する押釦スイッチの組み込みを容易なものにすることができる。
【００１７】
また、本発明は、前記構成の押釦スイッチにおいて、前記第２の導電性反転ばねの膨出部を短冊状に形成するという構成にした。
【００１８】
このように、第２の導電性反転ばねの膨出部を短冊状に形成すると、ドーム状に形成した場合に比べて基体及びフレームの横幅を小さくすることができるので、押釦スイッチの小型化を図ることができる。
【００１９】
また、本発明は、前記構成の押釦スイッチにおいて、前記基体と前記フレームとにスナップ結合用の係止爪と係止爪係合部とを形成し、前記基体に対して前記フレームをスナップ結合するという構成にした。
【００２０】
このように、基体とフレームとをスナップ結合すると、基体に対するフレームの組立を容易化することができ、押釦スイッチの低コスト化を図ることができると共に、電気機器への押釦スイッチの組み込み時にフレームの上面にキートップを弾接して摺動させても、その摩擦力によってフレームが位置ずれを起こすということがなく、電気機器に対する押釦スイッチの組み込みを容易かつ確実なものにすることができる。
【００２１】
一方、本発明は、前記の課題を解決するため、押釦スイッチの取付構造に関しては、第１乃至第３の固定接点を有する基体と、前記第１の固定接点と常時電気的に接続され、反転時に前記第２の固定接点と電気的に接続される第１の導電性反転ばねと、前記第３の固定接点と常時電気的に接続され、反転時に前記第１の導電性反転ばねと電気的に接続される第２の導電性反転ばねと、前記基体との間で前記第２の導電性反転ばねを動作可能に保持するフレームとを備え、前記第２の導電性反転ばねの操作部を前記フレームに開設されたキートップ挿通孔内に設定し、かつ前記第２の導電性反転ばねの操作部を前記フレームの上面よりも上方に配置してなる押釦スイッチを、当該押釦スイッチのキートップが備えられた電気機器の筐体に取り付ける押釦スイッチの取付構造であって、前記筐体の一面に前記キートップを弾性保持すると共に、前記筐体の内部に前記押釦スイッチを前記筐体の一面と平行に挿入可能な押釦スイッチの挿入空間を設け、前記押釦スイッチを前記空間内の所定位置まで挿入したとき、前記キートップの先端部が前記第２の導電性反転ばねの操作部に弾接され、かつ前記第１乃至第３の固定接点が前記筐体内に収納された電気回路と電気的に接続されるという構成にした。
【００２２】
このように、筐体の一面にキートップを弾性保持すると共に筐体の内部に押釦スイッチを前記筐体の一面と平行に挿入可能な押釦スイッチの挿入空間を設け、押釦スイッチを空間内の所定位置まで挿入したとき、キートップの先端部が第２の導電性反転ばねの操作部に弾接され、かつ押釦スイッチに備えられた第１乃至第３の固定接点が電気機器の筐体内に収納された電気回路と電気的に接続されるように押釦スイッチの取付構造を構成すると、単に電気機器の筐体に設けられた押釦スイッチの挿入空間内に押釦スイッチを挿入するだけで自動的にキートップによる第２の導電性反転ばねへの予圧負荷と必要な電気回路の接続とを完了できるので、電気機器に対する押釦スイッチの組み込み工程の簡略化を図ることができる。また、キートップの操作方向に対して直交する方向からの押釦スイッチの装着が可能になることから、電気機器における押釦スイッチ設定スペース周りのレイアウトの自由度を高めることができる。
【００２３】
【発明の実施の形態】
以下、本発明に係る押釦スイッチの第１実施形態例を、図１乃至図５に基づいて説明する。図１は第１実施形態例に係る押釦スイッチの非操作状態の断面図、図２は第１実施形態例に係る押釦スイッチに備えられる第２の導電性反転ばねの斜視図、図３は第１実施形態例に係る押釦スイッチの第１の接点切替状態を示す断面図、図４は第１実施形態例に係る押釦スイッチの第２の接点切替状態を示す断面図、図５は第１実施形態例に係る押釦スイッチの取付構造を示す断面図である。
【００２４】
これらの図から明らかなように、本例の押釦スイッチ１Ａは、浅底の箱形状を有する基体１と、当該基体１の所定の位置に設定された第１乃至第３の固定接点２，３，４と、前記第１の固定接点２と常時電気的に接続され、反転時に前記第２の固定接点３と電気的に接続される第１の導電性反転ばね５と、前記第３の固定接点４と常時電気的に接続され、反転時に前記第１の導電性反転ばね５と電気的に接続される第２の導電性反転ばね６と、当該第２の導電性反転ばね６の上面に被着された防塵シート７と、前記基体１の開口部側に被着された金属板製のフレーム８とから主に構成されており、前記フレーム８の中央部には、キートップ１０の先端部を挿通するためのキートップ挿通孔９が開設されている。
【００２５】
前記基体１は、絶縁性樹脂の成形体をもって平面形状が略正方形に形成されており、その片面には、前記第１の導電性反転ばね５の設定凹部１１と前記第２の導電性反転ばね６の設定凹部１２とが凹設され、相対向する２つの側面には、フレーム８をスナップ結合するための係止爪１３が突設されている。前記第１の設定凹部１１の中央部には前記第２の固定接点３が設定され、その外周部分には前記第１の固定接点２が設定されている。また、前記第２の設定凹部１２の外周部分には、前記第３の固定接点４が設定されている。前記第１乃至第３の固定接点２，３，４は、インサートモールドにより前記基体１の所定部分に設定される。なお、図中の符号１４は、前記第１乃至第３の固定接点２，３，４の端子部を示している。
【００２６】
前記第１の導電性反転ばね５は、導電性及びばね弾性に優れた金属材料をもって、外周が前記第１の固定接点２と接触可能な大きさの円椀ドーム状に形成されている。この第１の導電性反転ばね５は、前記第１の設定凹部１１内に収納された後、脱落防止用の接着テープ１５を用いて前記基体１に反転動作可能に固定される。
【００２７】
前記第２の導電性反転ばね６は、図２に示すように、円椀ドーム状に形成された膨出部６ａと、前記第３の固定接点４と接触するフランジ部６ｂとから構成されており、前記膨出部６ａの頂上部分には、キートップ１０の先端部によって押圧操作される窪み状の操作部１６が形成されている。この第２の導電性反転ばね６は、導電性及びばね弾性に優れた金属材料をもって形成される。
【００２８】
前記防塵シート７は、片面に接着剤層（図示省略）を有する合成樹脂シートをもって形成されており、図示しない接着剤層を介して前記第２の導電性反転ばね６の上面と前記基体１の上面とに接着される。
【００２９】
前記フレーム８は、キートップ挿通孔９が開設された上板８ａと、当該上板８ａの対向する２辺より下向きに折り下げられた側板８ｂとから形成されており、側板８ｂには前記基体１の側面に突設された係止爪１３に係合するための係止爪係合部８ｃが形成されている。このフレーム８は、前記係止爪１３に前記係止爪係合部８ｃをスナップ結合することによって前記基体１に取り付けられる。
【００３０】
フレーム８が基体１に取り付けられたとき、図１に示すように、第２の導電性反転ばね６は、膨出部６ａが前記防塵シート７を介して前記キートップ挿通孔９の開口端に当接され、前記基体１に反転動作可能に固定される。また、第２の導電性反転ばね６の操作部１６は、前記キートップ挿通孔９内に設定され、かつ前記フレーム８の上面よりも上方に配置される。
【００３１】
以下、前記のように構成された第１実施形態例に係る押釦スイッチ１Ａの接点切替動作について説明する。
【００３２】
本例の押釦スイッチ１Ａは、非操作時においては、図１に示すように、第１の導電性反転ばね５が上向きに湾曲して第１の固定接点２と第２の固定接点３とが電気的に切離されている。また、第２の導電性反転ばね６も上向きに湾曲しており、第１の固定接点２及び第２の固定接点３と第３の固定接点４とが電気的に切離されている。
【００３３】
この状態から、第２の導電性反転ばね６の操作部１６をキートップ１０によって押圧すると、第２の導電性反転ばね６の膨出部６ａが下向きに弾性変形され、当該第２の導電性反転ばね６と第１の導電性反転ばね５とが接触した段階で第１の固定接点２と第３の固定接点４とが導通し、第１の接点切替状態になる。また、この状態からさらにキートップ１０を押圧すると、その押圧力によって第１の導電性反転ばね５が下向きに反転し、これら第１及び第２の導電性反転ばね５，６を介して第１乃至第３の固定接点２，３，４が導通し、第２の接点切替状態になる。
【００３４】
また、第１の接点切替状態又は第２の接点切替状態からキートップに加えられていた押圧力を除けば、第１及び第２の導電性反転ばね５，６の弾性力により、図１に示す非操作状態に自動的に復帰する。
【００３５】
本例の押釦スイッチ１Ａは、第１乃至第３の固定接点２，３，４を有する基体１と、第１及び第２の導電性反転ばね５，６と、防塵シート７と、フレーム８とから構成したので、従来例に係る押釦スイッチに備えられていたリーフバネを省略することができ、押釦スイッチの薄形化を図ることができる。また、第２の導電性反転ばね６の操作部１６をフレーム８に開設されたキートップ挿通孔９内に設定し、かつ当該第２の導電性反転ばね６の操作部１６をフレーム８の上面よりも上方に配置したので、第２の導電性反転ばね６の上方にフレーム８が配置されず、この点からも押釦スイッチの薄形化を図ることができる。よって、本例の押釦スイッチ１Ａは、基体１の底面から第２の導電性反転ばね６の操作部１６までの全高ｈを従来例に係る押釦スイッチに比べて格段に小さくすることができる。
【００３６】
また、本例の押釦スイッチ１Ａは、第２の導電性反転ばね６の上面を防塵シート７で覆ったので、スイッチ装置内への塵埃等の異物の侵入を防止でき、押釦スイッチの耐久性を高めることができる。
【００３７】
また、本例の押釦スイッチ１Ａは、第２の導電性反転ばね６に膨出部６ａを形成し、フレーム８に開設されたキートップ挿通孔９の開口端に当該膨出部６ａを当接したので、電気機器への押釦スイッチの組み込み時、電気機器の筐体に弾性保持されたキートップ１０の下端部をフレーム８の上面に当接した状態から押釦スイッチをキートップ１０の操作方向に対して直交する方向に移動させたときに、キートップ１０の下端部をフレーム８上から第２の導電性反転ばね６の膨出部６ａ上に円滑に移動させることができ、電気機器に対する押釦スイッチの組み込みを円滑に行うことができる。
【００３８】
また、本例の押釦スイッチ１Ａは、第２の導電性反転ばね６の膨出部６ａを円椀ドーム状に形成したので、電気機器への押釦スイッチの組み込み時に、キートップ１０に対する第２の導電性反転ばね６の移動方向に方向性をなくすことができ、電気機器に対する押釦スイッチの組み込みを容易なものにすることができる。
【００３９】
さらに、本例の押釦スイッチ１Ａは、基体１とフレーム８とをスナップ結合するので、基体１に対するフレーム８の組立を容易化することができ、押釦スイッチの低コスト化を図ることができると共に、電気機器への押釦スイッチの組み込み時にフレーム８の上面にキートップ１０を弾接して摺動させても、その摩擦力によってフレーム８が位置ずれを起こすということがなく、電気機器に対する押釦スイッチの組み込みを容易かつ確実なものにすることができる。
【００４０】
以下、前記のように構成された押釦スイッチ１Ａの電気機器に対する取付構造を、図５に基づいて説明する。
【００４１】
図５に示すように、押釦スイッチ１Ａは、プリント配線基板２１に実装される。一方、電気機器の筐体２２の上面２２ａには、第１及び第２の導電性反転ばね５，６を操作するためのキートップ１０が、垂直下向きに付勢されて弾性保持されている。また、当該筐体２１の内部には、前記押釦スイッチ１Ａ及びプリント配線基板２１を横方向より挿入可能なスイッチ挿入空間２３が前記筐体２２の上面２２ａと平行に設けられており、当該スイッチ挿入空間２３内には、電気機器に備えられた電気回路（図示省略）に接続された導電性のクリップ２４が設定されている。前記キートップ１０の下端部は、前記スイッチ挿入空間２３内に挿入された押釦スイッチ１Ａのフレーム上面８ａよりもやや低い位置になるように設定される。
【００４２】
このように構成された押釦スイッチの取付構造において、スイッチ挿入空間２３内にプリント配線基板２１に実装された押釦スイッチ１Ａを挿入すると、まずキートップ１０の下端部がフレーム８の上板８ａと側板８ｂとの角部に当接する。この状態から押釦スイッチ１Ａをさらに挿入すると、その挿入力によってキートップ１０が図示しない付勢部材の弾性力に抗して上昇してフレーム８の上面に乗り上げ、フレーム８の上面上を摺動する。そして、キートップ１０がフレーム８の上板８ａに開設されたキートップ挿通孔９を超えた段階で第２の導電性反転ばね６側に移行する。この状態から押釦スイッチ１Ａをさらに挿入すると、その挿入力によってキートップ１０が図示しない付勢部材の弾性力に抗して上昇し、第２の導電性反転ばね６の弧面に沿って上昇する。また、この過程で、プリント配線基板２１がクリップ２４に挟み込まれる。そして、プリント配線基板２１がクリップ２４の停止端と衝合した段階で、キートップ１０の下端部が第２の導電性反転ばね６の操作部１６に当接される。これによって、第２の導電性反転ばね６の予圧並びにプリント配線基板２１と電気機器に備えられた電気回路との電気的接続とが同時に完了する。
【００４３】
このように、本例の押釦スイッチの取付構造は、筐体２２の上面２２ａにキートップ１０を垂直に弾性保持すると共に筐体２２の内部に押釦スイッチ１Ａを横方向から挿入可能なスイッチ挿入空間２３を設け、押釦スイッチ１Ａをスイッチ挿入空間２３内の所定位置まで挿入したときに、キートップ１０の先端部が第２の導電性反転ばね６の操作部１６に弾接され、かつ押釦スイッチ１Ａに備えられた第１乃至第３の固定接点２，３，４が筐体２２内に収納された電気回路と電気的に接続されるようにしたので、単に電気機器の筐体２２に設けられたスイッチ挿入空間２３内に押釦スイッチ１Ａを挿入するだけで自動的にキートップ１０による第２の導電性反転ばね６への予圧負荷と必要な電気回路の接続とを完了できるので、電気機器に対する押釦スイッチ１Ａの組み込み工程の簡略化を図ることができる。また、キートップ１０の操作方向に対して直交する方向からの押釦スイッチ１Ａの装着が可能になることから、電気機器における押釦スイッチ設定スペース周りのレイアウトの自由度を高めることができる。
【００４４】
次に、本発明に係る押釦スイッチの第２実施形態例を、図６及び図７に基づいて説明する。図６は第２実施形態例に係る押釦スイッチの非操作状態の断面図、図７は第２実施形態例に係る押釦スイッチに備えられる第２の導電性反転ばねの斜視図である。
【００４５】
第２実施形態例に係る押釦スイッチ１Ｂは、図６に示すように、第２の導電性反転ばね６として、短冊状のものを用いたことを特徴とする。その他については、第１実施形態例に係る押釦スイッチ１Ａと同じであるので、図６の対応部分に同一の符号を付して説明を省略する。
【００４６】
本例の押釦スイッチ１Ｂは、図６から明らかなように、第２の導電性反転ばね６として膨出部６ａが短冊状のものを用いたので、ドーム状のものを用いた場合に比べて基体１及びフレーム８の横幅Ｗを小さくすることができ、押釦スイッチの小型化を図ることができる。
【００４７】
電気機器の筐体に対する取付構造については、第１実施形態例に係る押釦スイッチ１Ａとほぼ同じであるので、説明を省略する。但し、第２実施形態例に係る押釦スイッチ１Ｂについては、キートップ１０の脱落を防止するため、スイッチ挿入空間２３内への押釦スイッチ１Ｂの挿入を、短冊状に形成された第２の導電性反転ばね６の長手方向に沿って行う必要がある。
【００４８】
なお、前記実施形態例に係る押釦スイッチ１Ａ，１Ｂにおいては、防塵シート７を備えたが、塵埃等による汚染が問題にならない場合には、この防塵シート７を省略することもできる。
【００４９】
【発明の効果】
以上説明したように、本発明の押釦スイッチは、第１乃至第３の固定接点を有する基体と、第１及び第２の導電性反転ばねと、フレーム８とから構成したので、従来例に係る押釦スイッチに備えられていたリーフバネを省略することができ、押釦スイッチの薄形化を図ることができる。また、第２の導電性反転ばねの操作部をフレームに開設されたキートップ挿通孔内に設定し、かつ当該第２の導電性反転ばねの操作部をフレームの上面よりも上方に配置したので、第２の導電性反転ばねの上方にフレームが配置されず、この点からも押釦スイッチの薄形化を図ることができる。よって、押釦スイッチの全高ｈを従来例に係る押釦スイッチに比べて格段に小さくすることができる。
【００５０】
また、本発明の押釦スイッチの取付構造は、筐体の一面にキートップを弾性保持すると共に筐体の内部に押釦スイッチを前記筐体の一面と平行に挿入可能な押釦スイッチの挿入空間を設け、押釦スイッチを空間内の所定位置まで挿入したとき、キートップの先端部が第２の導電性反転ばねの操作部に弾接され、かつ押釦スイッチに備えられた第１乃至第３の固定接点が電気機器の筐体内に収納された電気回路と電気的に接続されるようにしたので、単に電気機器の筐体に設けられた押釦スイッチの挿入空間内に押釦スイッチを挿入するだけで自動的にキートップによる第２の導電性反転ばねへの予圧負荷と必要な電気回路の接続とを完了することができ、電気機器に対する押釦スイッチの組み込み工程の簡略化を図ることができる。また、キートップの操作方向に対して直交する方向からの押釦スイッチの装着が可能になることから、電気機器における押釦スイッチ設定スペース周りのレイアウトの自由度を高めることができる。
【図面の簡単な説明】
【図１】第１実施形態例に係る押釦スイッチの非操作状態の断面図である。
【図２】第１実施形態例に係る押釦スイッチに備えられる第２の導電性反転ばねの斜視図である。
【図３】第１実施形態例に係る押釦スイッチの第１の接点切替状態を示す断面図である。
【図４】第１実施形態例に係る押釦スイッチの第２の接点切替状態を示す断面図である。
【図５】第１実施形態例に係る押釦スイッチの取付構造を示す断面図である。
【図６】第２実施形態例に係る押釦スイッチの非操作状態の断面図である。
【図７】第２実施形態例に係る押釦スイッチに備えられる第２の導電性反転ばねの斜視図である。
【図８】従来例に係る押釦スイッチの断面図である。
【符号の説明】
１Ａ，１Ｂ　押釦スイッチ
１　基体
２　第１の固定接点
３　第２の固定接点
４　第３の固定接点
５　第１の導電性反転ばね
６　第２の導電性反転ばね
７　防塵シート
８　フレーム
９　キートップ挿通孔
１０　キートップ
２１　プリント配線基板
２２　電気機器の筐体
２３　スイッチ挿入空間
２４　クリップ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a push-button switch and a mounting structure thereof, and more particularly, to a configuration of a two-stage operation switch incorporated in a camera or the like having an auto-focus function, and mounting of the two-stage operation switch on a housing of an electric device such as a camera. Regarding the structure.
[0002]
[Prior art]
FIG. 8 shows an example of this type of conventionally known push button switch. As is apparent from this figure, the push button switch of the present example has a base 101 having a shallow box shape, an outer peripheral fixed contact 102, a center fixed contact 103, and a common fixed contact set at predetermined positions of the base 101. 104, a conductive dish-shaped inverting spring 105 that is always electrically connected to the outer peripheral fixed contact 102, and is electrically connected to the central fixed contact 103 at the time of inversion, and is always electrically connected to the common fixed contact 104. The leaf spring 106 is electrically connected to the conductive dish-shaped reversing spring 105 during operation, a resin spring film 108 for pressing a movable tongue 107 formed on the leaf spring 106, and an opening of the base 101. It is composed of a dustproof rubber sheet 109 attached, and a metal plate cover 110 attached to the outer surface of the rubber sheet 109, The central portion of the bar 110, the operation hole 111 for pressing the resin spring film 108 via the externally rubber sheet 109 is opened. As this type of push button switch, a two-stage operation switch disclosed in JP-A-2002-124153 can be used.
[0003]
In the push button switch of this example, when not operated, as shown in FIG. 8, the conductive dish-shaped inverting spring 105 curves upward and the outer peripheral fixed contact 102 and the center fixed contact 103 are electrically disconnected. ing. Further, the resin spring film 108 is also curved upward, the movable tongue 107 is in a non-operating state, and the outer peripheral fixed contact 102 and the central fixed contact 103 are electrically separated from the common fixed contact 104.
[0004]
The contact switching of the push button switch is performed by pressing a key top (not shown) having a leading end abutting on the center of the outer surface of the rubber sheet 109. That is, when a key top (not shown) is pressed, the central portion of the resin spring film 108 is bent downward, and the movable tongue 107 of the leaf spring 106 is elastically deformed downward. Then, when the movable tongue 107 and the conductive dish-shaped reversing spring 105 come into contact with each other, the outer peripheral fixed contact 102 and the common fixed contact 104 conduct, and the first contact switching state is established. Further, when a key top (not shown) is further pressed from this state, the pressing force reverses the conductive dish-shaped reversing spring 105 downward, and the outer peripheral fixed contact 102 via the conductive dish-shaped reversing spring 105 and the leaf spring 106. The center fixed contact 103 and the common fixed contact 104 conduct, and the second contact switching state is established.
[0005]
Excluding the pressing force applied to the key top from the first contact switching state or the second contact switching state, the elastic force of the conductive dish-shaped reversing spring 105, leaf spring 106, resin spring film 108 and rubber sheet 109 causes Automatically returns to the non-operation state shown in FIG.
[0006]
[Problems to be solved by the invention]
However, in the push button switch according to the conventional example, since the resin spring film 108, the rubber sheet 109, and the cover 110 are arranged above the movable tongue piece 107, the overall height H of the push button switch is large, and There is a disadvantage that a large switch setting space is required for the electric equipment to be provided.
[0007]
In addition, this type of push button switch prevents the key top provided in the housing of the electric device from swinging, and in order to improve the usability of the push button switch, the key top is elastically contacted with the outer surface of the rubber sheet 109. Although it is necessary to apply a preload to the resin spring film 108, the push button switch according to the conventional example has a cover 110 disposed above the movable tongue 107 and a key through an operation hole 111 formed in the center of the cover 110. Since the lower end of the top is configured to abut the center of the outer surface of the rubber sheet 109, when assembling into an electric device, first, a push button switch is housed in a switch setting space provided in the electric device and the outer peripheral fixed contact 102 , The central fixed contact 103 and the common fixed contact 104 are connected to an electric circuit provided in the electric device, and thereafter, the key is connected from above the switch setting space. A cover member whose top is elastically held is attached to the housing of the electric device, and the lower end of the key top is elastically contacted with the center of the outer surface of the rubber sheet 109, or the key top is elastically attached to the housing of the electric device in advance. The lower end of the key top is resiliently contacted with the center of the outer surface of the rubber sheet 109 by raising the push button switch from the lower end side of the key top, and then the outer peripheral fixed contact 102, the center fixed contact 103 and the common It is necessary to adopt a method of connecting the fixed contact 104 to an electric circuit provided in the electric device, and the assembly process of the push button switch for the electric device is complicated, and the layout of the electric device is limited.
[0008]
The present invention has been made to solve such a technical problem, and an object thereof is to provide a push button switch which is thin and easy to attach to an electric device, and a push button for an electric device. It is an object of the present invention to provide a push button switch mounting structure that can facilitate switch mounting.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention relates to a push button switch, in which a base having first to third fixed contacts and the first fixed contact are always electrically connected to each other, A first conductive reversing spring electrically connected to the fixed contact; and a first conductive reversing spring that is always electrically connected to the third fixed contact and is electrically connected to the first conductive reversing spring when reversing. And a frame for operably holding the second conductive inversion spring between the base and the base, wherein an operation unit of the second conductive inversion spring is opened in the frame. And the operation portion of the second conductive reversing spring is disposed above the upper surface of the frame.
[0010]
As described above, when the push button switch is configured by the base having the first to third fixed contacts, the first and second conductive reversing springs, and the frame, the push button switch according to the conventional example is provided. Since the leaf spring can be omitted, the thickness of the push button switch can be reduced. Further, when the operating portion of the second conductive reversing spring is set in the key top insertion hole formed in the frame, and the operating portion of the second conductive reversing spring is disposed above the upper surface of the frame, Since the frame is not arranged above the second conductive reversing spring, the push button switch can be made thinner from this point as well. Further, the operating portion of the second conductive reversing spring is set in the key top insertion hole formed in the frame, and the operating portion of the second conductive reversing spring is disposed above the upper surface of the frame. By inserting the push button switch into the housing from a direction perpendicular to the operation direction of the key top in a state where the lower end of the key top elastically held by the housing of the electric device is in contact with the upper surface of the frame, A preload can be automatically applied to the second conductive reversing spring, which simplifies the process of assembling the pushbutton switch into the electric device and increases the degree of freedom in layout around the pushbutton switch setting space in the electric device. it can.
[0011]
Further, according to the present invention, in the push button switch having the above configuration, the upper surface of the second conductive reversing spring is covered with a dustproof sheet, and the surface of the dustproof sheet is passed through a keytop insertion hole formed in the frame. It is configured to be located above the above.
[0012]
As described above, when the upper surface of the second conductive reversing spring is covered with the dustproof sheet, entry of foreign matter such as dust into the switch device can be prevented, so that the durability of the push button switch can be increased.
[0013]
The present invention also provides the push-button switch having the above-described configuration, wherein at least a part of the second conductive reversing spring forms a bulged portion having a circular cross-sectional shape, and a top portion thereof serves as the operating portion. The bulging portion is configured to contact the opening end of the key top insertion hole formed in the frame directly or via the dustproof sheet.
[0014]
Thus, when the arc-shaped bulging portion is formed in the second conductive reversing spring and the bulging portion comes into contact with the opening end of the key top insertion hole formed in the frame, the push button switch to the electric device is formed. At the time of the incorporation, when the push button switch is moved in a direction orthogonal to the operation direction of the key top from a state where the lower end of the key top elastically held by the housing of the electric device is in contact with the upper surface of the frame, Since the lower end of the key top can be moved smoothly from the frame onto the bulging portion of the second conductive reversing spring, the push button switch can be smoothly incorporated into the electric device.
[0015]
Further, according to the present invention, in the push button switch having the above configuration, the bulging portion of the second conductive reversing spring is formed in a dome shape.
[0016]
As described above, when the bulging portion of the second conductive reversing spring is formed in a dome shape, the direction of movement of the second conductive reversing spring with respect to the keytop is lost when the push button switch is incorporated into the electric device. Therefore, it is possible to easily incorporate the push button switch into the electric device.
[0017]
Further, according to the present invention, in the push button switch having the above configuration, the bulging portion of the second conductive inversion spring is formed in a strip shape.
[0018]
As described above, when the bulging portion of the second conductive reversing spring is formed in a strip shape, the lateral width of the base and the frame can be reduced as compared with the case where the bulging portion is formed in a dome shape. Can be planned.
[0019]
Further, according to the present invention, in the push button switch having the above configuration, a locking claw and a locking claw engaging portion for snap connection are formed on the base and the frame, and the frame is snap-connected to the base. Was configured.
[0020]
As described above, when the base and the frame are snap-coupled, the assembly of the frame to the base can be facilitated, the cost of the push button switch can be reduced, and the frame can be mounted when the push button switch is incorporated into the electric device. Even when the key top is resiliently slid on the upper surface and slides, the frame does not shift due to the frictional force, and the push button switch can be easily and reliably incorporated into the electric device.
[0021]
On the other hand, according to the present invention, in order to solve the above-mentioned problem, with respect to the mounting structure of the push button switch, the base having the first to third fixed contacts, and the first fixed contact are always electrically connected to each other, A first conductive inversion spring that is electrically connected to the second fixed contact at times, and is always electrically connected to the third fixed contact, and is electrically connected to the first conductive inversion spring when inverted. A second conductive reversing spring connected to the main body, and a frame that operably holds the second conductive reversing spring between the base and an operating part of the second conductive reversing spring. A push button switch, which is set in a key top insertion hole formed in the frame, and in which an operation portion of the second conductive reversing spring is disposed above the upper surface of the frame, comprises a key top of the push button switch. To the housing of electrical equipment equipped with Mounting structure of the push button switch, wherein the key top is elastically held on one surface of the housing, and the push button switch is inserted into the housing in parallel with the one surface of the housing. When a space is provided and the push button switch is inserted to a predetermined position in the space, the tip of the key top is elastically contacted with the operating portion of the second conductive reversing spring, and the first to the third The fixed contact is electrically connected to an electric circuit housed in the housing.
[0022]
As described above, the key top is elastically held on one surface of the housing, and the insertion space for the push button switch in which the push button switch can be inserted in parallel with the one surface of the housing is provided inside the housing. When the key top is inserted to the position, the tip of the key top is elastically contacted with the operating portion of the second conductive reversing spring, and the first to third fixed contacts provided on the push button switch are housed in the housing of the electric device. When the mounting structure of the push button switch is configured to be electrically connected to the electrical circuit, the key is automatically inserted simply by inserting the push button switch into the insertion space of the push button switch provided in the housing of the electric device. Since the preloading of the second conductive reversing spring by the top and the connection of the necessary electric circuit can be completed, the process of assembling the push button switch to the electric device can be simplified. Further, since the push button switch can be mounted in a direction orthogonal to the key top operation direction, the degree of freedom in layout around the space for setting the push button switch in the electric device can be increased.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a push button switch according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of the push-button switch according to the first embodiment in a non-operating state, FIG. 2 is a perspective view of a second conductive reversing spring provided in the push-button switch according to the first embodiment, and FIG. FIG. 4 is a cross-sectional view showing a first contact switching state of the push button switch according to the first embodiment, FIG. 4 is a cross-sectional view showing a second contact switching state of the push button switch according to the first embodiment, and FIG. It is sectional drawing which shows the mounting structure of the pushbutton switch which concerns on a form example.
[0024]
As is clear from these figures, the push button switch 1A of the present example comprises a base 1 having a shallow box shape, and first to third fixed contacts 2 and 3 set at predetermined positions on the base 1. , 4, a first conductive reversing spring 5 that is always electrically connected to the first fixed contact 2 and is electrically connected to the second fixed contact 3 at the time of inversion, and the third fixed A second conductive reversing spring 6 which is always electrically connected to the contact 4 and which is electrically connected to the first conductive reversing spring 5 at the time of reversing, on the upper surface of the second conductive reversing spring 6 It is mainly composed of a dustproof sheet 7 attached and a metal plate frame 8 attached to the opening side of the base 1, and a central portion of the frame 8 has a tip of a key top 10. A key top insertion hole 9 for inserting the portion is provided.
[0025]
The base 1 is formed in a substantially square shape by molding a molded body of an insulating resin, and has a set recess 11 of the first conductive reversing spring 5 and a second conductive reversing spring on one surface thereof. 6 are formed with concave portions 12, and locking claws 13 for snap-connecting the frame 8 are protruded from two opposing side surfaces. The second fixed contact 3 is set at the center of the first setting recess 11, and the first fixed contact 2 is set at the outer periphery thereof. The third fixed contact 4 is set on the outer peripheral portion of the second setting recess 12. The first to third fixed contacts 2, 3, and 4 are set on a predetermined portion of the base 1 by insert molding. Reference numeral 14 in the drawing indicates the terminal portions of the first to third fixed contacts 2, 3, and 4.
[0026]
The first conductive reversing spring 5 is made of a metal material having excellent conductivity and spring elasticity, and has an outer periphery formed in a bowl dome shape large enough to contact the first fixed contact 2. After the first conductive reversing spring 5 is housed in the first setting recess 11, the reversing operation is fixed to the base 1 using an adhesive tape 15 for preventing the first conductive reversing spring 5 from falling off.
[0027]
As shown in FIG. 2, the second conductive reversing spring 6 includes a bulging portion 6a formed in a bowl dome shape, and a flange portion 6b contacting the third fixed contact 4. A depression-shaped operation portion 16 that is pressed by the tip of the key top 10 is formed at the top of the bulging portion 6a. The second conductive reversing spring 6 is formed of a metal material having excellent conductivity and spring elasticity.
[0028]
The dustproof sheet 7 is formed of a synthetic resin sheet having an adhesive layer (not shown) on one side, and the upper surface of the second conductive reversing spring 6 and the base 1 are interposed via an adhesive layer (not shown). Glued to the top surface.
[0029]
The frame 8 is formed of an upper plate 8a having a key top insertion hole 9 and a side plate 8b folded downward from two opposing sides of the upper plate 8a. A locking claw engaging portion 8c for engaging with the locking claw 13 protrudingly provided on the side surface is formed. The frame 8 is attached to the base 1 by snap-fitting the locking claw engaging portion 8c to the locking claw 13.
[0030]
When the frame 8 is attached to the base 1, as shown in FIG. 1, the second conductive reversing spring 6 has a bulging portion 6 a at the opening end of the key top insertion hole 9 via the dustproof sheet 7. It is fixed to the base 1 so as to be able to perform an inversion operation. The operating portion 16 of the second conductive reversing spring 6 is set in the key top insertion hole 9 and is disposed above the upper surface of the frame 8.
[0031]
Hereinafter, the contact switching operation of the push button switch 1A according to the first embodiment configured as described above will be described.
[0032]
When the push button switch 1A of this example is not operated, as shown in FIG. 1, the first conductive reversing spring 5 bends upward and the first fixed contact 2 and the second fixed contact 3 are connected. Electrically disconnected. Further, the second conductive inversion spring 6 is also curved upward, and the first fixed contact 2 and the second fixed contact 3 are electrically separated from the third fixed contact 4.
[0033]
In this state, when the operating portion 16 of the second conductive reversing spring 6 is pressed by the key top 10, the bulging portion 6a of the second conductive reversing spring 6 is elastically deformed downward, and the second conductive reversing spring 6 is elastically deformed downward. When the reversing spring 6 and the first conductive reversing spring 5 come into contact with each other, the first fixed contact 2 and the third fixed contact 4 conduct, and the first contact switching state is established. Further, when the key top 10 is further pressed from this state, the first conductive reversing spring 5 is inverted downward by the pressing force, and the first conductive reversing spring 5 is turned on via the first and second conductive reversing springs 5 and 6. In addition, the third to third fixed contacts 2, 3, and 4 conduct, and the second contact switching state is established.
[0034]
Except for the pressing force applied to the key top from the first contact switching state or the second contact switching state, the elastic force of the first and second conductive reversing springs 5 and 6 causes the elastic force of FIG. It automatically returns to the non-operation state shown.
[0035]
The push button switch 1A of the present example includes a base 1 having first to third fixed contacts 2, 3, 4, first and second conductive reversing springs 5, 6, a dustproof sheet 7, a frame 8, , The leaf spring provided in the conventional pushbutton switch can be omitted, and the pushbutton switch can be made thinner. Further, the operation part 16 of the second conductive inversion spring 6 is set in the key top insertion hole 9 opened in the frame 8, and the operation part 16 of the second conductive inversion spring 6 is placed on the upper surface of the frame 8. Since the frame 8 is arranged above, the frame 8 is not arranged above the second conductive reversing spring 6, so that the push button switch can be made thinner from this point as well. Therefore, in the pushbutton switch 1A of the present example, the total height h from the bottom surface of the base 1 to the operation portion 16 of the second conductive reversing spring 6 can be significantly reduced as compared with the pushbutton switch according to the conventional example.
[0036]
In addition, since the push button switch 1A of the present example covers the upper surface of the second conductive reversing spring 6 with the dustproof sheet 7, foreign matter such as dust can be prevented from entering the switch device, and the durability of the push button switch is improved. Can be enhanced.
[0037]
Further, the push button switch 1A of the present embodiment has a swelling portion 6a formed in the second conductive reversing spring 6, and the swelling portion 6a abuts on the opening end of the key top insertion hole 9 formed in the frame 8. Therefore, when the push-button switch is incorporated into the electric device, the lower end of the key top 10 elastically held by the housing of the electric device is brought into contact with the upper surface of the frame 8 and the push-button switch is moved in the operation direction of the key top 10. When the key top 10 is moved in a direction orthogonal to the direction, the lower end of the key top 10 can be smoothly moved from above the frame 8 onto the bulging portion 6a of the second conductive reversing spring 6, and the push button for the electric device can be moved. The switch can be incorporated smoothly.
[0038]
Further, in the push button switch 1A of the present example, since the bulging portion 6a of the second conductive reversing spring 6 is formed in a circular bowl dome shape, when the push button switch is incorporated into the electric device, the second key top 10 is moved. The direction of movement of the conductive reversing spring 6 can be eliminated, and the push-button switch can be easily incorporated into an electric device.
[0039]
Furthermore, since the push button switch 1A of the present embodiment snap-connects the base 1 and the frame 8, the assembly of the frame 8 to the base 1 can be facilitated, and the cost of the push button switch can be reduced. Even if the key top 10 is elastically contacted with the upper surface of the frame 8 and slides when the push button switch is incorporated into the electric device, the frictional force does not cause the frame 8 to be displaced, and the push button switch is incorporated into the electric device. Can be made easy and reliable.
[0040]
Hereinafter, the mounting structure of the push button switch 1A configured as described above to an electric device will be described with reference to FIG.
[0041]
As shown in FIG. 5, the push button switch 1A is mounted on the printed wiring board 21. On the other hand, a key top 10 for operating the first and second conductive reversing springs 5 and 6 is elastically held by being urged vertically downward on the upper surface 22a of the housing 22 of the electric device. A switch insertion space 23 into which the push button switch 1A and the printed wiring board 21 can be inserted from the lateral direction is provided inside the housing 21 in parallel with the upper surface 22a of the housing 22. In the space 23, a conductive clip 24 connected to an electric circuit (not shown) provided in the electric device is set. The lower end of the key top 10 is set to be slightly lower than the upper surface 8a of the frame of the push button switch 1A inserted into the switch insertion space 23.
[0042]
In the push button switch mounting structure thus configured, when the push button switch 1A mounted on the printed wiring board 21 is inserted into the switch insertion space 23, first, the lower end of the key top 10 is connected to the upper plate 8a of the frame 8 and the side plate. 8b. When the push button switch 1A is further inserted from this state, the key top 10 rises by the insertion force against the elastic force of the urging member (not shown), rides on the upper surface of the frame 8, and slides on the upper surface of the frame 8. . Then, at the stage where the key top 10 has passed the key top insertion hole 9 formed in the upper plate 8 a of the frame 8, the key top 10 moves to the second conductive reversing spring 6 side. When the push button switch 1A is further inserted from this state, the key top 10 rises by the insertion force against the elastic force of the urging member (not shown), and rises along the arc surface of the second conductive reversing spring 6. . In this process, the printed wiring board 21 is sandwiched between the clips 24. Then, when the printed wiring board 21 abuts against the stop end of the clip 24, the lower end of the key top 10 is brought into contact with the operation section 16 of the second conductive reversing spring 6. Thus, the preload of the second conductive reversing spring 6 and the electrical connection between the printed circuit board 21 and the electric circuit provided in the electric device are simultaneously completed.
[0043]
As described above, the mounting structure of the push button switch according to the present embodiment has a switch insertion space in which the key top 10 is vertically elastically held on the upper surface 22a of the housing 22 and the push button switch 1A can be inserted into the housing 22 from the lateral direction. When the push button switch 1A is inserted to a predetermined position in the switch insertion space 23, the tip of the key top 10 is elastically contacted with the operating portion 16 of the second conductive reversing spring 6, and the push button switch 1A is provided. Since the first to third fixed contacts 2, 3, and 4 provided in the electronic device are electrically connected to the electric circuit housed in the housing 22, they are simply provided on the housing 22 of the electric device. By simply inserting the push button switch 1A into the switch insertion space 23, the preloading of the second conductive reversing spring 6 by the key top 10 and the connection of the necessary electric circuit can be completed automatically. versus Simplification of that push-button switch 1A of incorporation step can be achieved. Further, since the push button switch 1A can be mounted from a direction orthogonal to the operation direction of the key top 10, the degree of freedom in layout around the space for setting the push button switch in the electric device can be increased.
[0044]
Next, a second embodiment of the push button switch according to the present invention will be described with reference to FIGS. FIG. 6 is a sectional view of the push-button switch according to the second embodiment in a non-operating state, and FIG. 7 is a perspective view of a second conductive reversing spring provided in the push-button switch according to the second embodiment.
[0045]
As shown in FIG. 6, a push button switch 1B according to the second embodiment is characterized in that a strip-shaped second conductive reversing spring 6 is used. The other parts are the same as those of the push button switch 1A according to the first embodiment, and the corresponding parts in FIG.
[0046]
As is apparent from FIG. 6, the push-button switch 1B of the present example uses a strip-shaped bulging portion 6a as the second conductive reversing spring 6, so that it is compared with a dome-shaped switch. The lateral width W of the base 1 and the frame 8 can be reduced, and the size of the push button switch can be reduced.
[0047]
The mounting structure of the electric device with respect to the housing is substantially the same as that of the push button switch 1A according to the first embodiment, and therefore the description is omitted. However, regarding the push button switch 1B according to the second embodiment, in order to prevent the key top 10 from falling off, the insertion of the push button switch 1B into the switch insertion space 23 is performed by using a second conductive member formed in a strip shape. This must be performed along the longitudinal direction of the reversing spring 6.
[0048]
Although the push button switches 1A and 1B according to the embodiment have the dustproof sheet 7, the dustproof sheet 7 can be omitted when contamination by dust or the like does not pose a problem.
[0049]
【The invention's effect】
As described above, the push-button switch of the present invention includes the base having the first to third fixed contacts, the first and second conductive reversing springs, and the frame 8, so that the push-button switch according to the conventional example is provided. The leaf spring provided in the push button switch can be omitted, and the push button switch can be made thin. Also, since the operating portion of the second conductive reversing spring is set in the key top insertion hole opened in the frame, and the operating portion of the second conductive reversing spring is arranged above the upper surface of the frame. Since the frame is not arranged above the second conductive reversing spring, the push button switch can be made thinner from this point as well. Therefore, the overall height h of the push button switch can be significantly reduced as compared with the conventional push button switch.
[0050]
In addition, the mounting structure of the push button switch of the present invention is provided with an insertion space for the push button switch that can elastically hold the key top on one surface of the housing and insert the push button switch inside the housing in parallel with the one surface of the housing. When the push button switch is inserted to a predetermined position in the space, the tip of the key top is elastically contacted with the operating portion of the second conductive reversing spring, and the first to third fixed contacts provided in the push button switch Is electrically connected to the electrical circuit housed in the housing of the electrical equipment, so that simply inserting the pushbutton switch into the insertion space of the pushbutton switch provided in the housing of the electrical equipment automatically In addition, the preloading of the second conductive reversing spring by the key top and the connection of the necessary electric circuit can be completed, and the process of mounting the push button switch on the electric device can be simplified. Further, since the push button switch can be mounted in a direction orthogonal to the key top operation direction, the degree of freedom of layout around the space for setting the push button switch in the electric device can be increased.
[Brief description of the drawings]
FIG. 1 is a sectional view of a non-operating state of a push button switch according to a first embodiment.
FIG. 2 is a perspective view of a second conductive reversing spring provided in the push button switch according to the first embodiment.
FIG. 3 is a cross-sectional view illustrating a first contact switching state of the push button switch according to the first embodiment.
FIG. 4 is a sectional view showing a second contact switching state of the push button switch according to the first embodiment.
FIG. 5 is a cross-sectional view illustrating a mounting structure of the push button switch according to the first embodiment.
FIG. 6 is a sectional view of a non-operated state of a push button switch according to a second embodiment.
FIG. 7 is a perspective view of a second conductive reversing spring provided in the push button switch according to the second embodiment.
FIG. 8 is a sectional view of a push button switch according to a conventional example.
[Explanation of symbols]
1A, 1B push button switch
1 Substrate
2 First fixed contact
3 Second fixed contact
4. Third fixed contact
5. First conductive reversing spring
6. Second conductive reversing spring
7 Dustproof sheet
8 frames
9 Key top insertion hole
10 key tops
21 Printed wiring board
22 Housing for electrical equipment
23 Switch insertion space
24 clips

Claims

A base having first to third fixed contacts, a first conductive reversing spring that is always electrically connected to the first fixed contacts, and is electrically connected to the second fixed contacts during inversion; A second conductive inversion spring that is always electrically connected to the third fixed contact and is electrically connected to the first conductive inversion spring at the time of inversion; And a frame for operably holding the conductive reversing spring of (a), an operating part of the second conductive reversing spring is set in a key-top insertion hole formed in the frame, and the second conductive reversing spring is provided. A push button switch, wherein an operation portion of the reversing spring is disposed above an upper surface of the frame.

The upper surface of the second conductive reversing spring is covered with a dustproof sheet, and the surface of the dustproof sheet is disposed above the upper surface of the frame through a keytop insertion hole formed in the frame. 2. The push button switch according to 1.

At least a part of the second conductive reversing spring is formed with a bulged portion having an arcuate cross-sectional shape, and a top portion thereof serves as the operating portion, and an opening end of a key-top insertion hole formed in the frame. The push-button switch according to claim 1, wherein the bulging portion is abutted directly or via the dust-proof sheet.

The push-button switch according to claim 3, wherein the bulging portion of the second conductive reversing spring is formed in a dome shape.

4. The push-button switch according to claim 3, wherein the bulging portion of the second conductive reversing spring is formed in a strip shape.

The locking claws for snap connection and the locking claw engaging portions are formed on the base and the frame, and the frame is snap-connected to the base. Pushbutton switch as described.

A base having first to third fixed contacts, a first conductive reversing spring that is always electrically connected to the first fixed contacts, and is electrically connected to the second fixed contacts during inversion; A second conductive inversion spring that is always electrically connected to the third fixed contact and is electrically connected to the first conductive inversion spring at the time of inversion; And a frame for operably holding the conductive reversing spring of (a), an operating part of the second conductive reversing spring is set in a key-top insertion hole formed in the frame, and the second conductive reversing spring is provided. A pushbutton switch mounting structure for mounting a pushbutton switch in which an operation portion of a reversing spring is disposed above an upper surface of the frame to a housing of an electric device provided with a keytop of the pushbutton switch, wherein the housing includes: Elastic holding of the key top on one side of the body In addition, an insertion space for a push button switch in which the push button switch can be inserted in parallel with one surface of the housing is provided inside the housing, and when the push button switch is inserted to a predetermined position in the space, the key top is inserted. A leading end of the second conductive reversing spring is elastically contacted with an operating portion of the second conductive reversing spring, and the first to third fixed contacts are electrically connected to an electric circuit housed in the housing. Mounting structure of the push button switch.