JP2012115542A - ズーム式電子内視鏡 - Google Patents

ズーム式電子内視鏡 Download PDF

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JP2012115542A
JP2012115542A JP2010269076A JP2010269076A JP2012115542A JP 2012115542 A JP2012115542 A JP 2012115542A JP 2010269076 A JP2010269076 A JP 2010269076A JP 2010269076 A JP2010269076 A JP 2010269076A JP 2012115542 A JP2012115542 A JP 2012115542A
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Akimoto Katayama
暁元 片山
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Hoya Corp
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Abstract

【課題】押しボタンスイッチと回転レバースイッチとを、操作性のよい同軸に配置して防水構造にし、しかもスイッチレバーを軽く回転操作することができる操作性のよいズーム式電子内視鏡を提供すること。
【解決手段】スイッチボタン20Aがスイッチレバー30Aの回転動作と一体に軸線周り方向に回転して、スイッチボタン20Aとスイッチレバー30Aとが相対的に回転しないように構成し、回転レバースイッチ30の回転動作部を通って操作部7内に外部から水が浸入するのを阻止するための防水シール手段として、回転レバースイッチ30により回転動作をする回転動作面(40)とそれに対向する操作部7の固定面(8h)との間をシールするシール用Oリング32が一つだけ設けられている。
【選択図】 図1

Description

この発明はズーム式電子内視鏡に関する。
ズーム式電子内視鏡には、内視鏡観察画像に関する制御を電気的に遠隔操作するための押しボタンスイッチと、内視鏡観察画像のズーミングを電気的に遠隔操作するための回転レバースイッチ等のようなリモートコントロールスイッチが操作部に併設された構成を有するものが少なくない。
そのような従来のズーム式電子内視鏡においては、操作部の背面の上端部近傍の領域等に、押しボタンスイッチのスイッチボタンと、回転レバースイッチのスイッチレバーとが並んで配置されている(例えば、特許文献1)。
しかし、内視鏡が多機能になって操作部材が多くなると、操作し易い位置に配置することができないスイッチが出てくることが避けられない。そこで、スイッチボタンとスイッチレバーとを同軸に配置して、スイッチレバーがスイッチボタンの周囲を回動動作するようにすることで操作性を改善している(対物レンズ、特許文献2)。
特開2007−325747 特開2010−240239
図7は、特許文献2に記載されたリモートコントロールスイッチを示しており、内視鏡の操作部の外壁部50を貫通して配置されたシリンダ状部材60の内周部に押しボタンスイッチ70が配置され、外周部に回転レバースイッチ80が配置されている。70Aは押し込み操作されるゴム製のスイッチボタン、80Aは回転操作されるスイッチレバーである。
内視鏡の操作部は使用後に洗浄消毒等が行われるので、完全な防水構造に形成する必要がある。そこで、押しボタンスイッチ70側においては、スイッチボタン70Aに連設されて軸線方向に進退するピストン状部材72の外周面とシリンダ状部材60の内周面との嵌合部(摺動面)にシール用Oリング73が配置されている。
また、回転レバースイッチ80側においては、スイッチレバー80Aにより回転動作をする内周側回転動作面82とシリンダ状部材60の外周面との嵌合部(摺動面)に第1のシール用Oリング83が配置されると共に、外周側回転動作面84と操作部の外壁部50側の面との嵌合部(摺動面)に第2のシール用Oリング85が配置されている。
しかし、実際に特許文献2に記載されたリモートコントロールスイッチを製作して使用してみると、スイッチレバー80Aの操作が思いの他重くて動作が鈍くなりがちなため、操作感が優れないだけでなく、操作者にとってその回転操作が負担になる場合があった。
その原因は、スイッチレバー80Aに対して二つのシール用Oリング83,85から作用する摺動抵抗(摩擦抵抗)が大きいためであり、特に、径の大きな第2のシール用Oリング85の影響が大きいことが判明した。
本発明は、押しボタンスイッチと回転レバースイッチとを、操作性のよい同軸に配置して防水構造にし、しかもスイッチレバーを軽く回転操作することができる操作性のよいズーム式電子内視鏡を提供することを目的とする。
上記の目的を達成するため、本発明のズーム式電子内視鏡は、内視鏡観察画像に関する制御を電気的に遠隔操作する押しボタンスイッチのスイッチボタンの外周を囲んで、内視鏡観察画像のズーミングを電気的に遠隔操作するための回転レバースイッチのスイッチレバーがスイッチボタンの軸線周り方向に回動動作するように操作部に設けられ、押しボタンスイッチ及び回転レバースイッチの領域を通って操作部内に外部から水が浸入するのを阻止するための防水シール手段が設けられたズーム式電子内視鏡において、スイッチボタンがスイッチレバーの回転動作と一体に軸線周り方向に回転して、スイッチボタンとスイッチレバーとが相対的に回転しないように構成し、回転レバースイッチの回転動作部を通って操作部内に外部から水が浸入するのを阻止するための防水シール手段として、回転レバースイッチにより回転動作をする回転動作面とそれに対向する操作部の固定面との間をシールするシール用Oリングが一つだけ設けられているものである。
なお、スイッチレバーと一体に回転するシリンダ状部材が、操作部の外壁部を貫通して形成された受け孔に軸線周り方向に回転自在に嵌挿配置されていて、そのシリンダ状部材の外周面と受け孔の内周面との間をシールするようにシール用Oリングが配置され、スイッチボタンに連設されたピストン状部材がシリンダ状部材内に軸線方向に進退自在に嵌挿配置されていてもよい。
また、スイッチレバーを軸線周り方向に付勢してスイッチレバーを所定の向きに戻すためのレバー戻しバネが、受け孔の周囲を囲んで操作部の外壁部にドーナツ状に形成された凹部に配置されていてもよい。
本発明によれば、押しボタンスイッチと回転レバースイッチとを操作性のよい同軸に配置して防水構造にしたものにおいて、スイッチボタンがスイッチレバーの回転動作と一体に軸線周り方向に回転する構成にしたことにより、回転レバースイッチの回転動作部を通って操作部内に外部から水が浸入するのを阻止するための防水シール手段として、回転レバースイッチの回転動作面とそれに対向する操作部側の固定面との間にシール用Oリングを一つだけ配置すれば済むことになり、スイッチレバーを軽く回転操作することができて優れた操作性を得ることができ、操作者の負担を大幅に低減することができる。
本発明の実施例に係るリモートコントロールスイッチの正面断面図である。 本発明の実施例に係るズーム式電子内視鏡の全体構成の略示図である。 本発明の実施例に係るズーム式電子内視鏡の操作部の背面図である。 本発明の実施例の図1におけるIV−IV断面図である。 本発明の実施例の図1におけるV−V断面図である。 本発明の実施例に係るリモートコントロールスイッチの一部を分解して示す斜視図である。 従来のリモートコントロールスイッチの正面断面図である。
以下、図面を参照して本発明の実施例を説明する。
図2は、本発明の実施例に係るズーム式電子内視鏡の全体構成を略示しており、可撓性の挿入部1の先端面に観察窓2や照明窓等が並んで配置されている。
観察窓2の奥に配置された対物光学系3はいわゆるズーム光学系であり、レンズ又はレンズ群の一部を軸線方向に移動させることにより、焦点距離を変化させる(即ち、ズーミングをする)ことができる。
対物光学系3による被写体の投影位置には、図示されていない固体撮像素子が配置されており、そこで撮像された内視鏡観察像の撮像信号が、信号ケーブル4により挿入部1内を通って図示されていない外部のビデオプロセッサに伝送される。
5は、挿入部1内に挿通配置された駆動ケーブルである。この駆動ケーブル5が、挿入部1の基端に連結された操作部7側から駆動され、先端の鏡筒駆動機構6を駆動することにより、対物光学系3のズーミング(即ち、焦点距離調整)が行われる。
なお、この実施例では、操作部7に内蔵された図示されていないモータにより駆動ケーブル5が回転駆動されるが、先端の鏡筒駆動機構6の位置にモータ又はアクチュエータ等を配置し、駆動ケーブル5に代えて導電線を配置してもよい。
操作部7には各種の操作部材が配置されている。操作部7の背面の上端部近傍の領域には、図3に拡大図示されるように、押しボタンスイッチ20と回転レバースイッチ30とが同軸に一つに設けられたリモートコントロールスイッチ10が配置されている。
そのリモートコントロールスイッチ10には、押し込み操作される押しボタンスイッチ20のスイッチボタン20Aの外周を囲んで、回転操作される回転レバースイッチ30のスイッチレバー30Aが、スイッチボタン20Aの軸線周り方向に回動動作するように設けられている。
リモートコントロールスイッチ10のうち、押しボタンスイッチ20は、例えば内視鏡観察画像の撮影やビデオ録画等のような内視鏡観察画像に関する制御を電気的に遠隔操作するためのものであり、回転レバースイッチ30は、内視鏡観察画像のズーミングを遠隔操作するためのものである。
図1は、リモートコントロールスイッチ10を示している。7Aは操作部7の外壁であるハウジング。8は、リモートコントロールスイッチ10がユニットとして組み付けられたベース部材である。
ただし、ベース部材8は、ナット8Aでハウジング7Aに固定された状態では操作部7の外壁部を形成する状態になる。そこで、ここでは、操作部7のハウジング7Aとリモートコントロールスイッチ10のベース部材8とが、共に操作部7の外壁部を形成しているものとする。
環状(略二重円筒状)に形成されたベース部材8の中心軸線位置に貫通形成された受け孔8hには、シリンダ状部材40が軸線周り方向に回転自在に嵌挿配置されている。操作部7内に位置するシリンダ状部材40の内端部にはナット40Aが締め付けられていて、シリンダ状部材40が軸線方向には移動しないようにベース部材8に保持されている。
操作部7外に突出しているシリンダ状部材40の外端部には、弾力性のあるゴム材等で半球キャップ状に形成されたスイッチボタン20Aの外縁部が、接着剤等により固着されている。その結果、スイッチボタン20Aはシリンダ状部材40が軸線周り方向に回転するとそれと一体に回転する。
そのスイッチボタン20Aは、外方から押し込み操作されると外縁部以外の部分が弾性変形をしてシリンダ状部材40の口元側に向かって押しつぶされた状態になり、押し込み操作が解除されると自己の弾性により図1に示される待機状態に戻る。
シリンダ状部材40内には、スイッチボタン20Aに連設されたピストン状部材21が軸線方向に進退自在に嵌挿配置されている。スイッチボタン20Aとピストン状部材21は、スイッチボタン20Aの内面中央に形成された突起がピストン状部材21の突端に形成された窪みに抜け出さない状態に係合していることにより、一体的に動作するようになっている。
ピストン状部材21が設けられている空間は、スイッチボタン20Aにより外部からシールされていて水が浸入しないようになっている。ただし、スイッチボタン20Aに亀裂が生じた場合等でもそこから操作部7内に水が浸入しないよう、シリンダ状部材40の内周面とピストン状部材21の外周面との嵌合面に、シール用Oリング22が設けられている。
従って、押しボタンスイッチ20の領域を通って操作部7内に外部から水が浸入するのを阻止するための防水手段は、基本的にはスイッチボタン20A自体であるが、シール用Oリング22も、さらに防水性を高めるために機能している。
操作部7内に固定的に配置されたフレーム板71には、ピストン状部材21の真下の位置に第1の電気スイッチ41が取り付けられている。その結果、押しボタンスイッチ20のスイッチボタン20Aが押し込み操作されると、ピストン状部材21の内端で第1の電気スイッチ41が押されてオンになり、前述のように内視鏡観察画像に関する制御が行われる。
回転レバースイッチ30のスイッチレバー30Aは、操作部7外においてシリンダ状部材40の外周に固定されている。30Bはその固定ナットである。スイッチレバー30Aとシリンダ状部材40とは主に製造上の理由から別部品になっているが、機能的には一部品として考えて差し支えないものである。
したがって、スイッチレバー30Aが軸線周り方向に回転操作されるとシリンダ状部材40が軸線周り方向に回転し、前述のように、それと共にスイッチボタン20Aも回転することになる。
即ち、スイッチボタン20Aがスイッチレバー30Aの回転動作と一体に軸線周り方向に回転して、スイッチボタン20Aとスイッチレバー30Aとが相対的に回転しないように構成されており、これが本発明の大きな特徴である。
操作部7内に位置するシリンダ状部材40の内端部分には、フレーム板71に取り付けられたズーミング用の第2の電気スイッチ42をオン/オフさせるためのスイッチ駆動部材31が前述のナット40Aで固定されている。
以下、その周辺部分については、図1におけるIV−IV断面図である図4、V−V断面図である図5、及びスイッチレバー30Aとベース部材8とスイッチ駆動部材31の分解斜視図である図6等も参照して説明をする。
図6に分かり易く図示されているように、スイッチ駆動部材31には、第2の電気スイッチ42に直接接触して第2の電気スイッチ42をオン/オフさせるための棒状のスイッチ駆動ロッド31Aが軸線と平行方向に端面から突出形成されている。
また、スイッチ駆動部材31の回転範囲を規制するために、図5に示されるように互いに係合する内方突起44と突起回動凹部45とが、図6に示されるようにベース部材8とスイッチ駆動部材31とに形成されている。
図6に示されるベース部材8の外周面に形成された円周溝90には、ハウジング7Aに貫通形成されたベース部材取り付け孔7hとの間をシールするための固定部シール用Oリング9(図1参照)が装着される。
スイッチレバー30Aを所定の向きに戻すためのレバー戻しバネ35が、スイッチ駆動部材31とシリンダ状部材40を介してスイッチレバー30Aを軸線周り方向に付勢する状態に、ベース部材8の受け孔8hを囲んでベース部材8にドーナツ状に形成された凹部内に配置されている(図4参照)。
レバー戻しバネ35は軸線周り方向に弾性変形されるコイルバネであり、その両端はベース部材8に形成されたバネ受け部46に当接している。その結果、スイッチレバー30Aが回転操作されると、スイッチレバー30Aは、待機位置から時計回り方向と反時計周り方向のどちらにもレバー戻しバネ35の付勢力に抗して回転し、操作力が除かれるとレバー戻しバネ35の付勢力によって元の待機位置に戻される。
図5はそのような待機状態におけるV−V断面を図示している。第2の電気スイッチ42としては、内視鏡観察画像をテレ(拡大)側に駆動する信号をオンにするためのマイクロスイッチと、ワイド(縮小)側に駆動する信号をオンにするための二つのマイクロスイッチが一組で配置されている。二つのマイクロスイッチは、待機状態では共にオフになっていて、スイッチ駆動ロッド31Aが回動することにより一方がオンにされる。
図1に戻って、回転レバースイッチ30の回転動作部を通って操作部7内に外部から水が浸入するのを阻止するための防水シール手段として、スイッチレバー30Aにより回転動作をする回転動作面(即ち、シリンダ状部材40の外周面)とそれに対向する操作部7の固定面(即ち、ベース部材8の受け孔8hの内周面)との間をシールするシール用Oリング32が一つだけ設けられている。
シール用Oリング32が装着される円周溝33はシリンダ状部材40の外周面に形成されており、レバー戻しバネ35の内径より小さな径である。そのシール用Oリング32の他には、回転レバースイッチ30の回転動作部を通って操作部7内に外部から水が浸入するのを阻止するための防水シール手段は設けられていない。
そのような構成により、スイッチレバー30Aを回転操作した時にその操作に対して作用する防水シール手段の摺動抵抗は、径の小さなシール用Oリング32の摩擦抵抗だけなので、従来の数分の一の大きさに減少し、スイッチレバー30Aを軽くスムーズに回転操作することができて、優れた操作性を得ることができる。
7 操作部
8 ベース部材
8h 受け孔(固定面)
20 押しボタンスイッチ
20A スイッチボタン
21 ピストン状部材
30 回転レバースイッチ
30A スイッチレバー
32 シール用Oリング
35 レバー戻しバネ
40 シリンダ状部材(回転動作面)

Claims (3)

  1. 内視鏡観察画像に関する制御を電気的に遠隔操作する押しボタンスイッチのスイッチボタンの外周を囲んで、上記内視鏡観察画像のズーミングを電気的に遠隔操作するための回転レバースイッチのスイッチレバーが上記スイッチボタンの軸線周り方向に回動動作するように操作部に設けられ、上記押しボタンスイッチ及び上記回転レバースイッチの領域を通って上記操作部内に外部から水が浸入するのを阻止するための防水シール手段が設けられたズーム式電子内視鏡において、
    上記スイッチボタンが上記スイッチレバーの回転動作と一体に軸線周り方向に回転して、上記スイッチボタンと上記スイッチレバーとが相対的に回転しないように構成し、
    上記回転レバースイッチの回転動作部を通って上記操作部内に外部から水が浸入するのを阻止するための防水シール手段として、上記回転レバースイッチにより回転動作をする回転動作面とそれに対向する上記操作部の固定面との間をシールするシール用Oリングが一つだけ設けられていることを特徴とするズーム式電子内視鏡。
  2. 上記スイッチレバーと一体に回転するシリンダ状部材が、上記操作部の外壁部を貫通して形成された受け孔に軸線周り方向に回転自在に嵌挿配置されていて、そのシリンダ状部材の外周面と上記受け孔の内周面との間をシールするように上記シール用Oリングが配置され、上記スイッチボタンに連設されたピストン状部材が上記シリンダ状部材内に軸線方向に進退自在に嵌挿配置されている請求項1記載のズーム式電子内視鏡。
  3. 上記スイッチレバーを軸線周り方向に付勢して上記スイッチレバーを所定の向きに戻すためのレバー戻しバネが、上記受け孔の周囲を囲んで上記操作部の外壁部にドーナツ状に形成された凹部に配置されている請求項2記載のズーム式電子内視鏡。
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