JP3666136B2

JP3666136B2 - Noble gas discharge lamp

Info

Publication number: JP3666136B2
Application number: JP24231596A
Authority: JP
Inventors: 聖導吉田
Original assignee: Ushio Denki KK
Current assignee: Ushio Denki KK
Priority date: 1996-09-12
Filing date: 1996-09-12
Publication date: 2005-06-29
Anticipated expiration: 2016-09-12
Also published as: JPH1092386A

Description

【０００１】
【発明の属する技術分野】
この発明は希ガス放電灯に関し、特にガラスバルブの外周面に一対の帯状の外部電極を有する希ガス放電灯において、外部電極の端部から導出された端子の処理構造の改良に関する。
【０００２】
【従来の技術】
従来のこの種希ガス放電灯は、例えば図１３〜図１５に示すように構成されている。即ち、Ａは例えばガラスバルブよりなる直管状の外囲器であって、その内面には希土類蛍光体，ハロリン酸塩蛍光体などの蛍光体よりなる発光層Ｂが形成されている。尚、外囲器Ａの内部空間には例えば水銀などの金属蒸気を含まないキセノンガスなどを主成分とする希ガスが所定量封入されている。一方、外囲器Ａの外周面には、例えばアルミニウムなどの不透光性の金属部材よりなる帯状の一対の外部電極Ｃ，Ｄが互いに対向するように貼着されており、その外周面は例えばポリエチレンテレフタレ−ト（ＰＥＴ）樹脂などの熱収縮性樹脂よりなる保護チュ−ブＥにて被覆・保護されている。又、外部電極Ｃ，Ｄの端部からは例えば銅などの端子Ｆ，Ｆがアルミニウム用の半田（以下、アルミ半田という）Ｇ，Ｇにて半田付けして導出されている。この端子Ｆ，Ｆの導出部分はほぼＬ形に屈曲された上で、外囲器Ａの端面側に配置されている。そして、導出部分のそれぞれの間にはシリコ−ン樹脂などのように絶縁性に優れた接着剤Ｈが注入・固化されており、これにより端子Ｆ，Ｆが固定される。
【０００３】
この希ガス放電灯は、外部電極Ｃ，Ｄに高周波高電圧（例えば２５ＫＨｚで２５００Ｖｏ−ｐ）を印加することによりキセノンガスの放電が生じ、キセノンガスの励起線によって発光層Ｂが励起されて発光するものであり、光は外部電極Ｃ，Ｄの端部Ｃａ，Ｄａ間の開口部Ｐから放出される。特に、この希ガス放電灯には水銀が用いられていないために、点灯後における光量の立ち上がりが急峻であり、点灯と同時に光量がほぼ１００％近くにまで達するという特徴を有している。このために、ファクシミリ，イメ−ジスキャナ，複写機などのＯＡ機器の原稿読取用の光源として好適するものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、この希ガス放電灯は、次のように製造されるために、生産性の改善が難しいという問題がある。
【０００５】
即ち、まず、図１４〜図１５に示すように、外囲器Ａの外周面に一方の面に接着層を有する外部電極Ｃ，Ｄを、互いに所定の間隔だけ離隔するように、手作業によって貼付ける。次に、外部電極Ｃ，Ｄの端部に端子Ｆ，Ｆをアルミ半田Ｇ，Ｇにて半田付けすることによって、端子Ｆ，Ｆが外部電極Ｃ，Ｄから導出される。尚、外部電極Ｃ，Ｄの外囲器Ａの外周面への貼着は、外部電極Ｃ，Ｄに端子Ｆ，Ｆを半田付けした後に行なうこともできる。次に、端子Ｆ，Ｆの導出部分をほぼＬ形に屈曲して外囲器Ａの端面に沿わせると共に、それぞれの間に絶縁性に優れた接着剤Ｈを注入し固化させる。そして、端子Ｆ，Ｆの端部（接着剤Ｈに隣接する部分）に図示しない外部導出用のハ−ネスを半田付けする。次に、外囲器Ａをシリコ−ンワニス液に浸漬し引き上げた後に、例えば１時間程度乾燥させることにより、外囲器Ａ及び外部電極Ｃ，Ｄの表面にはシリコ−ンワニスの被膜が形成される。然る後、外囲器Ａに保護チュ−ブＥを被せると共に、この保護チュ−ブＥを１５０〜２００°Ｃ程度に加熱して熱収縮させ、外囲器Ａの外周面に保護チュ−ブＥを密着させることによって希ガス放電灯が製造される。
【０００６】
このように希ガス放電灯の製造工程には、外部電極Ｃ，Ｄの端部に端子Ｆ，Ｆをアルミ半田Ｇ，Ｇにて半田付けする工程があるが、外部電極Ｃ，Ｄに対する端子Ｆ，Ｆの幅が大きく半田付け面積が広い上に、手作業によって行なわれるために、作業者間のバラツキが大きく、アルミ半田Ｇ，Ｇの盛り上がり形態が一定化しない傾向にある。例えばアルミ半田Ｇ，Ｇが大きく盛り上がってしまうと、端子Ｆ，Ｆの面積が広いために、図１５に示すように、保護チュ−ブＥを装着した状態において、端子Ｆ，Ｆの外部電極Ｃ，Ｄへの半田付け部分の外径が外囲器Ａの中央部分の外径に比べて局部的に大きくなる。
【０００７】
ところで、近時、ファクシミリ，イメ−ジスキャナ，複写機などの０Ａ機器は、ユ−ザ−などの要請に基づいて小形化が進められており、これに組み込まれる原稿読取用の光源としての希ガス放電灯に対しても同様に小形化が求められている。従って、組み込み部所における希ガス放電灯とＯＡ機器との間のクリアランスは極めて小さいものである。
【０００８】
このために、希ガス放電灯の外径のバラツキが全長に亘って小さい場合には何ら問題はないものの、上述のように希ガス放電灯の外径が局部的に大きくなると、希ガス放電灯をＯＡ機器の所定部所に組み込めなくなるという問題が生ずる。
【０００９】
又、上述の製造工程には、端子Ｆ，Ｆを外部電極Ｃ，Ｄの端部から導出した後に、導出部分をほぼＬ形に屈曲すると共に、それぞれの間に接着剤Ｈを注入・固化する工程があるが、接着剤Ｈの注入空間部は一対の端子Ｆ，Ｆが対向する部分に形成されるものの、端子Ｆ，Ｆに隣接する部分には注入空間部の仕切りとなる壁面が存在しないために、接着剤Ｈの注入時に、接着剤Ｈが注入空間部から流出しないように作業しなければならない。このために、作業が極めて煩雑になるという問題もある。
【００１０】
その上、上述の接着剤Ｈは端子Ｆ，Ｆの間に注入された後、１〜３日間程度放置しないと固化しないために、固化工程では他の作業を行なうことができず、作業性が著しく損なわれる。かといって、接着剤Ｈが完全に固化しないうちに端子Ｆ，Ｆに外部導出用のハ−ネスを半田付けしたりすると、その際に端子Ｆ，Ｆに作用する押圧力によって接着剤Ｈの一部が注入空間部から流出することがある。特に、流出の仕方によっては、端子Ｆ，Ｆの間に隙間が形成され、両者間の絶縁性が著しく損なわれることがある。この状態で、動作時させると、端子Ｆ，Ｆ間に放電が生成され、希ガス放電灯を点灯させることができなくなる。従って、このようなトラブルの発生を未然に防止するためには、再びかかる隙間を接着剤Ｈにて確実に充実させなければならず、作業性が損なわれることになる。
【００１１】
さらに、この希ガス放電灯の製造には、例えば手作業による外部電極Ｃ，Ｄの貼着工程，シリコ−ンワニスの被着−乾燥工程，保護チュ−ブＥの装着−熱収縮工程などのように数多くの製造工程を経なければならないこともあって、量産性を高めることもできにくいという問題もある。
【００１２】
それ故に、本発明の目的は、比較的に簡単な構成によって最終製品の形態のバラツキを小さくでき、生産性を改善できる上、外囲器の端部における端子間の絶縁破壊も抑制可能な希ガス放電灯を提供することにある。
【００１３】
【課題を解決するための手段】
従って、本発明は、上述の目的を達成するために、内面に発光層を有する直管状の外囲器と、外囲器の外周面に、それのほぼ全長に亘って離隔して配置した金属部材よりなる帯状の一対の外部電極と、外部電極と電気的な接続関係を有し、かつそれの端部から導出した端子と、外囲器の外周面に、外部電極が被覆されるように装着した透光性の絶縁部材とを具備し、前記端子の外部電極に電気的に接続される一方の端部の幅を他方の端部の幅より狭く設定したことである。
【００１４】
又、本発明の第２の発明は、前記透光性の絶縁部材を、透光性シート又は熱収縮性樹脂よりなる保護チューブにて構成したことを特徴とする。
【００１５】
又、本発明の第３の発明は、内面に発光層を有する直管状の外囲器と、外囲器の全長とほぼ同程度の長さを有する透光性シートの一方の面に金属部材よりなる帯状の一対の外部電極を互いに離隔して配置し、かつ外部電極の端部から外部電極と電気的な接続関係を有する端子を導出したシート構体とを具備し、前記外囲器の外周面にシート構体を、外囲器と透光性シートとの間に外部電極が位置するように巻回し、かつ端子の外部電極に電気的に接続される一方の端部の幅を他方の端部の幅より狭く設定したことを特徴とする。
【００１６】
さらに、本発明の第４の発明は、前記端子の他方の端部のほぼ中央部分に切り起し部を形成したことを特徴とする。
【００１７】
【発明の実施の形態】
次に、本発明の第１の実施例について図１〜図９を参照して説明する。同図において、１は例えばガラスバルブにて密閉状に構成された直管状の外囲器であって、その内面には希土類蛍光体，ハロリン酸塩蛍光体などの蛍光体よりなる発光層２が形成されている。特に、外囲器１の封着構造はガラスバルブの端部にディスク状の封着ガラス板１ａ，１ｂを封着して構成されているが、例えば単にガラスバルブを加熱しながら縮径加工し溶断して構成することもできる。尚、この外囲器１の密閉空間には水銀などの金属蒸気を含まない例えばキセノン（Ｘｅ），クリプトン（Ｋｒ），ネオン（Ｎｅ），ヘリウム（Ｈｅ）などの希ガスが単一又は混合して所定量封入されているが、キセノンを主成分とする希ガスを例えば２０〜１１０Ｔｏｒｒの圧力で封入することが望ましい。
【００１８】
この外囲器１の外周面にはシ−ト構体３が密着するように巻回されている。このシ−ト構体３は、例えば外囲器１の全長とほぼ同程度の長さを有し、かつ厚さが２０〜１００μｍの範囲に設定された透光性シ−ト４と、この透光性シ−ト４の一方の面に互いに所定の間隔だけ離隔配置して接着された不透光性の金属部材よりなる帯状の一対の外部電極５，６と、この外部電極５，６の端部から、それと電気的な接続関係を有し、かつ透光性シ−ト４の端縁部分より突出するように導出された端子５１，６１と、透光性シ−ト４の一方の面に付与された粘着ないし接着機能を有する接着層９とから構成されている。この接着層９としてはシリコ−ン系接着剤が好適するが、アクリル系接着剤なども使用できる。特に、この接着層９は外部電極５，６の露出面にも形成されているが、予め透光性シ−ト４の一方の面にのみ形成して外部電極５，６の露出面には形成しないように構成することもできる。尚、透光性シ−ト４としては、例えばポリエチレンテレフタレ−ト（ＰＥＴ）樹脂が好適するが、ポリエステル樹脂なども利用できる。
【００１９】
又、外部電極５，６及び端子５１，６１は、例えば腐食電位列が離れた位置にある金属部材にて構成されており、好ましくは外部電極５，６には帯状のアルミニウム箔が、端子５１，６１には後述する形状の銅が適用される。しかしながら、外部電極５，６としては導電性に優れ、かつ不透光性の金属部材であればアルミニウムの他に、ニッケル，銀などの金属部材も利用できるし、端子５１，６１としては導電性に優れ、かつ外部導出用のハ−ネスと半田付け可能な金属部材であれば銅の他に、ニッケル，ステンレス，Ｃｕ−Ｎｉ合金などの金属部材も利用できる。尚、外部電極５，６と端子５１，６１との電気的な接続は、例えば導電性接着剤，超音波溶着，かしめ，溶接，半田付けなどの接続方法により行なわれる。
【００２０】
特に、シ−ト構体３において、端子５１，６１は外部電極５，６に電気的に接続される一方の端部５１ａ，６１ａの幅ｄが他方の端部５１ｂ，６１ｂの幅ｇより狭く設定されており、外部電極５，６からの導出部分がほぼＬ形に形成されている。そして、屈曲された他方の端部５１ｂ，６１ｂにはほぼＬ形の切り起し部５２，６２が形成されており、その切り起し部分には図示しない外部導出用のハ−ネスが挿入される孔５２ａ，６２ａが形成されている。尚、この端子５１，６１の一方の端部５１ａ，６１ａの幅ｄは外部電極５，６の幅Ｗに対し、０．１Ｗ≦ｄ≦０．５Ｗの関係が成立するように設定することが望ましく、又、端子５１，６１の肉厚は０．１〜０．５ｍｍの範囲が望ましい。
【００２１】
上述のシ−ト構体３は外囲器１の外周面に、外部電極５，６が外囲器１と透光性シ−ト４との間に位置するように装着されており、後述の第２の開口部（８）において、透光性シ−ト４の一方の端部４ａに他方の端部４ｂを重ね合わせた上で接着されている。特に、シ−ト構体３の外囲器１への装着状態において、外部電極５，６の一端５ａ，６ａの間には第１の開口部７が、外部電極５，６の他端５ｂ，６ｂの間には第２の開口部８がそれぞれ形成されており、発光層２からの光は主として第１の開口部７から放出される。尚、第１，第２の開口部７，８の開口角θ₁ ，θ₂ はθ₁ ＞θ₂ の関係に設定することが望ましいが、同一に設定することもできる。
【００２２】
さらに、外囲器１の端面（１ａ）には絶縁性（耐圧），難燃性に優れた絶縁部材にて成形加工されたキャップ１０が装着されている。このキャップ１０は例えばポリカ−ボネイト樹脂にて成形されており、例えばブロック状のキャップ本体１１と、キャップ本体１１の周縁部分に一体的に形成された一対のＬ形状の支持片１２，１２とから構成されている。特に、キャップ本体１１の中央部分には外面側から内面側（外囲器１の端面側）に貫通する孔１１ａが、外周部分には平坦状の側面部１１ｂ，１１ｂがそれぞれ形成されている。そして、このキャップ１０は外囲器１の端部に、キャップ本体１１が外囲器１の端面側に位置し、かつ支持片１２，１２が外囲器１の端部を支持するように配置され、孔１１ａ及びキャップ本体１１と外囲器１の端面（１ａ）との間には絶縁性に優れた接着剤１３が充実された上で固化されている。これによって、キャップ１０は外囲器１に固定（装着）される。その上、このキャップ１０の側面部１１ｂ，１１ｂには、外部電極５，６から導出された端子５１，６１の他方の端部５１ｂ，６１ｂがほぼ密接するように配置されている。尚、側面部１１ｂ，１１ｂに位置する端子部分には、図示しない外部導出用のハ−ネスが半田付けなどにより接続される。
【００２３】
この希ガス放電灯は、例えば次のように製造される。まず、図１０に示すように、シ−ト構体３を展開した状態で所定の部位例えば組み立てステ−ジ１４に載置する。次に、外囲器１をシ−ト構体３の透光性シ−ト４の一端４ａに、外囲器１の長手方向が外部電極５，６の長手方向に沿うように（平行となるように）位置させる。この状態で、従動回転する一対のロ−ラ１５，１５を外囲器１に押し付けるようにセットする。これによって、外囲器１を透光性シ−ト４に若干押し付けられる。この状態において、ステ−ジ１４を若干図示するＭ方向に移動させた後、Ｎ方向に移動させると、外囲器１はロ−ラ１５，１５の従動回転により、透光性シ−ト４の他端４ｂの方向に転動することになる。これによって、シ−ト構体３は、図６に示すように、外囲器１の外周面に巻回される上、透光性シ−ト４の一端４ａに他端４ｂが重ね合わされ、接着層９によって接着される。尚、接着層９に熱硬化性接着剤を使用する場合には、熱処理することが望ましい。次に、キャップ１０の内面側に接着剤１３を塗布した上で、キャップ１０を外囲器１の端部に、キャップ本体１１の内面側が接着剤１３を介して外囲器１の端面（１ａ）に接着され、かつ支持片１２，１２が外囲器１の端部を挟持するように装着する。尚、この際に、端子５１，６１の他方の端部５１ｂ，６１ｂはキャップ１０の側面部１１ｂ，１１ｂにほぼ当接されるように配置される。この段階で、キャップ１０は外囲器１に仮固定される。次に、キャップ１０の孔１１ａから接着剤１３を注入し、孔１１ａ及びキャップ本体１１の内面側と外囲器１の端面（１ａ）との隙間部分を充実させる。然る後、接着剤１３の固化が行なわれる。尚、接着剤１３の塗布，注入は、キャップ１０を外囲器１の端部に装着した後に行なうこともできる。又、キャップ１０の外囲器１の端部への装着は、支持片１２，１２が、外囲器１の端部にまで位置するように配置した透光性シ−ト４に覆い被さるように装着することもできる。
【００２４】
この実施例によれば、端子５１，６１は、外部電極５，６に電気的に接続される一方の端部５１ａ，６１ａの幅ｄが他方の端部５１ｂ，６１ｂの幅ｇより狭くなるように構成されているために、一方の端部５１ａ，６１ａを外部電極５，６に仮に半田，導電性接着剤などを利用して接続しても、同部分が不所望に盛り上がることはなくなり、最終製品の外径を外囲器１のほぼ全長に亘って均斉化できる。従って、ＯＡ機器において、希ガス放電灯の組み込み空間部がかなり制約された状態であっても、確実に組み込むことができる。
【００２５】
特に、外部電極５，６の幅Ｗと端子５１，６１の一方の端部５１ａ，６１ａの幅ｄとの関係を、０．１Ｗ≦ｄ≦０．５Ｗに設定すれば、外部電極５，６と端子５１，６１との接続部分における異種金属接触腐食の発生を抑制できる。従って、長期間に亘って安定した動作状態を維持できる。しかしながら、端子５１，６１の幅ｄが０．１Ｗ未満になると、外部電極５，６と端子５１，６１との接触面積が小さくなりすぎて安定した接続状態の維持が難しくなるし、逆に、それの幅ｄが０．５Ｗを超えると、シ−ト構体３を外囲器１に巻回する際に、端子５１，６１が外囲器１の外周面に倣いにくくなる。従って、両者は上述の関係に設定することが望ましい。
【００２６】
しかも、端子５１，６１における他方の端部５１ｂ，６１ｂは、その幅ｇが一方の端部５１ａ，６１ａの幅ｄより広く設定されている上に、同部分に切り起し部５２，６２による孔５２ａ，６２ａが形成されているために、外部導出用のハ−ネスを孔に挿入した状態で半田付けすることができる。従って、ハ−ネスの接続性を改善することができる。
【００２７】
又、外囲器１の端部に装着されたキャップ１０は樹脂成形された固形状態に構成されているために、キャップ１０を外囲器１に、支持片１２，１２（又は接着剤１３）を利用して簡単に仮固定することができる。従って、キャップ１０の外囲器１への装着と同時に、それの側面部１１ｂ，１１ｂに端子５１，６１の他方の端部５１ｂ，６１ｂを配置することができ、直ちに端子５１，６１の他方の端部５１ｂ，６１ｂに外部導出用のハ−ネスを半田付けしても、従来のように接着剤に隙間が形成されて絶縁破壊されるというトラブルは全く発生せず、一連の作業を連続的に遂行でき、生産性を高めることができる。
【００２８】
その上、キャップ本体１１と外囲器１の端面（１ａ）との間及び孔１１ａには絶縁性に優れた接着剤１３が、少なくとも端子５１，６１の対向する部分に隙間が形成されないように、充実されているために、苛酷な環境下で動作させても端子間での絶縁破壊による放電の生成を確実に防止できる。
【００２９】
一方、上述の製造方法によれば、外囲器１をシ−ト構体３の上で実質的に単に転動させるだけで、外部電極５，６を外囲器１の外周面に貼着できるし、外部電極５，６は透光性シ−ト４に予め所定の間隔で配列されているために、貼り付けの際に外部電極５，６の間隔を所定の間隔となるように調整する必要が全くなく、仮に手作業であっても作業能率を著しく向上できる。具体的には、従来方法では製造に６０分間を要していたものが、本発明方法によれば１分程度に短縮できる。
【００３０】
又、シ−ト構体３における透光性シ−ト４の一方の面には、接着層９が形成されているために、外囲器１をシ−ト構体３の上で転動させるだけの単純動作によって、シ−ト構体３を外囲器１の外周面に巻回し密着させることができる。従って、作業能率を飛躍的に改善できるのみならず、機械化が可能となり、一層の量産効果が期待できる。
【００３１】
しかも、シ−ト構体３の外囲器１の外周面への巻回・密着状態において、透光性シ−ト４の端部４ａ，４ｂは互いに重ね合わせて接着されているために、外部電極５，６の被覆信頼性を高めることができる。特に、透光性シ−ト４の厚さを２０〜１００μｍの範囲に設定すれば、端部４ａ，４ｂの安定した重合・接着性が得られる。しかしながら、その厚さが２０μｍ未満になると、十分の絶縁性を確保できなくなるし、逆に１００μｍを超えると、シ−トの腰が強くなって端部４ａ，４ｂの重ね合わせ部分が剥がれ易くなり、巻回作業も面倒になる。従って、シ−ト厚さは上記範囲に設定することが望ましい。
【００３２】
さらには、外部電極５，６は、シ−ト構体３を外囲器１に装着する際に、透光性シ−ト４と外囲器１の外周面との間に位置するように配慮されているために、ファクシミリなどのＯＡ機器に適用されて使用時に高電圧が印加されても、外部電極間は勿論のこと、対地間絶縁をも十分に確保することができる。
【００３３】
図１１は本発明の第２の実施例を示すものであって、基本的な構成は図１〜図９に示す希ガス放電灯と同じである。異なる点は、端子５１Ａの他方の端部５１ｂを単にＬ形に屈曲しただけで、切り起し部を省略したことである。
【００３４】
この実施例によれば、第１の実施例のように、切り起し部５２を形成しなくてもよいために、端子５１Ａの構造が単純化される上、製造が簡単になり、コストも有効に低減できる。
【００３５】
図１２は本発明の第３の実施例を示すものであって、基本的な構成は図１〜図９に示す希ガス放電灯と同じである。異なる点は、第１の開口部７に対応する外囲器１の内面部分に発光層２を形成しないアパ−チャ部（光放出部）２ａを形成したことと、透光性シ−ト４の端部４ａ，４ｂの主たる重ね合わせ部分を外部電極５の外面側に設定したことである。尚、アパ−チャ部２ａの開口角は例えば７０〜１１０度の範囲に設定されているが、用途，目的などに応じて適宜に変更できる。又、端部４ａ，４ｂの重ね合わせ部分は外部電極６の外面側とすることもできる。
【００３６】
この実施例によれば、発光層２から放射された光は外囲器内において高密度化されてアパ−チャ部２ａから第１の開口部７を経て外部に放出されるために、原稿照射装置に適用した場合、原稿面の照度を高めることができ、原稿の読み取り精度を高めることができる。
【００３７】
特に、外部電極５，６の外囲器側の面に光反射性を付与すれば、アパ−チャ部２ａの照度をさらに高めることができ、原稿の読み取り精度も一層改善できる。これの材料としては、例えばアルミニウム箔のように光反射性を有する金属部材が好適する。
【００３８】
さらに、透光性シ−ト４の端部４ａ，４ｂの重ね合わせ部分を超音波溶着する場合には、超音波振動が外部電極５にて緩和されるために、外囲器内面からの発光層２の剥離を効果的に抑制できる。従って、照度分布の均一性の改善が可能となる。
【００３９】
図１２に示す第３の実施例を利用して本発明の第４の実施例について説明する。この実施例は、外囲器１の外周面に一対の外部電極５，６を貼着した後、透光性シ−ト４を外囲器１の外周面に、外部電極５，６が被覆されるように巻回・密着させると共に、透光性シ−ト４のそれぞれの端部４ａ，４ｂを重ね合わせて固定（接着，超音波溶着など）するものである。尚、端子５１，６１の外部電極５，６への電気的な接続は、外部電極５，６の外囲器１への貼着前又は貼着後のいずれであってもよいし、図１１に示す端子５１Ａを適用することもできる。
【００４０】
この実施例によれば、上述の各実施例に比較すると、機械化，作業能率の点で劣るものの、従来例よりは改善できる。特に、透光性シ−ト４の巻回に先立って、予め、外囲器１の外周面にシリコンワニスなどの絶縁被膜を形成しておけば、絶縁性の一層の改善が可能となる。
【００４１】
尚、本発明は、何ら上記実施例にのみ制約されることなく、例えば端子は一方の端部の幅が他方の端部の幅より狭ければよく、Ｌ形に屈曲せずにストレ−ト状などに構成することもできる。又、キャップは、その形態を適宜に変更できる。例えば支持片の数を増加したり、支持片の部分を全周に亘って筒状に形成したり、キャップ本体の側面部を外囲器の外径とほぼ同程度のほぼ円形状に形成したりすることもできる。又、キャップは樹脂材の他、セラミックなどにて成形加工することもできる。さらには、キャップは外囲器の両端に装着することもできる。この場合、端子の導出処理は一方のキャップに対して行なわれるが、両端において個別に行なうこともできる。特に、外囲器の外周面へのシ−ト構体の貼着は、外囲器をシ−ト構体の上で相対的に転動させる他、シ−ト構体を回転させて貼着することもできるし、それぞれの動作を併用させることもできる。
【００４２】
【発明の効果】
以上のように、本発明によれば、端子は、外部電極に電気的に接続される一方の端部の幅ｄが他方の端部の幅ｇより狭くなるように構成されているために、一方の端部を外部電極に仮に半田，導電性接着剤などを利用して接続しても、同部分が不所望に盛り上がることはなくなり、最終製品の外径を外囲器のほぼ全長に亘って均斉化できる。従って、ＯＡ機器において、希ガス放電灯の組み込み空間部がかなり制約された状態であっても、確実に組み込むことができる。
【００４３】
しかも、端子における他方の端部は、その幅ｇが一方の端部の幅ｄより広く設定されているために、外部導出用ハ−ネスの半田付けなどによる接続性，接続強度を改善することができる。特に、同部分に切り起し部を形成すれば、ハ−ネスを切り起しによる孔に挿入した上で接続できる関係で、ハ−ネスの接続性を一層改善することができる。
【００４４】
特に、外部電極の幅Ｗと端子の一方の端部の幅ｄとの関係を、０．１Ｗ≦ｄ≦０．５Ｗに設定すれば、外部電極と端子との接続部分における異種金属接触腐食の発生を抑制できる。従って、長期間に亘って安定した動作状態を維持することができる。
【００４５】
又、外囲器の端部に樹脂成形された固形状態のキャップを装着するように構成すれば、キャップを外囲器に接着剤を利用して簡単に仮固定することができる。従って、キャップの外囲器への装着と同時に、それの側面部に端子の他方の端部を配置することができ、直ちに端子の他方の端部に外部導出用のハ−ネスを接続しても、従来のように接着剤に隙間が形成されて絶縁破壊されるというトラブルは全く発生せず、一連の作業を連続的に遂行でき、生産性を高めることができる。
【００４６】
その上、キャップ本体に孔を形成し、キャップ本体と外囲器の端面との間及び孔に絶縁性に優れた接着剤を、少なくとも端子の対向する部分に隙間が形成されないように充実させれば、苛酷な環境下で動作させても端子間での絶縁破壊による放電の発生を確実に防止でき、安定した動作状態が得られる。
【００４７】
一方、透光性シ−トに一対の外部電極を配設してなるシ−ト構体を用いれば、外囲器をシ−ト構体の上で実質的に転動させるだけで外部電極を外囲器の外周面に簡単に貼着できる。従って、作業能率を飛躍的に改善できるのみならず、機械化が可能となり、一層の量産効果が期待できる。
【００４８】
さらには、外部電極は、シ−ト構体を外囲器に装着する際に、透光性シ−トと外囲器の外周面との間に位置するように配慮されているために、ファクシミリなどのＯＡ機器に適用されて使用時に高電圧が印加されても、外部電極間は勿論のこと、対地間絶縁をも十分に確保することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施例を示す図であって、同図（ａ）は要部の一部破断状態の側面図、同図（ｂ）は端子の斜視図。
【図２】図１（ａ）の正面図。
【図３】図２のＶ−Ｖ断面図。
【図４】図２のＷ−Ｗ断面図。
【図５】本発明にかかるキャップの斜視図。
【図６】図４のＸ−Ｘ断面図。
【図７】図１（ａ）の一部破断状態の側面図。
【図８】本発明にかかるシ−ト構体の展開図。
【図９】図８のＹ−Ｙ断面図。
【図１０】本発明方法を説明するための縦断面図。
【図１１】本発明の第２の実施例を示す図であって、同図（ａ）は要部の一部破断状態の側面図、同図（ｂ）は端子の斜視図。
【図１２】本発明の第３の実施例を示す縦断面図。
【図１３】従来例の縦断面図。
【図１４】従来方法を説明するための斜視図。
【図１５】図１３のＺ−Ｚ断面図。
【符号の説明】
１外囲器
２発光層
３シ−ト構体
４透光性シ−ト
４ａ，４ｂ端部
５，６外部電極
５１，５１Ａ，６１端子
５１ａ，６１ａ一方の端部
５１ｂ，６１ｂ他方の端部
５２，６２切り起し部
５２ａ，６２ａ孔
９接着層
１０キャップ
１１キャップ本体
１１ａ孔
１１ｂ側面部
１３接着剤
１４ステ−ジ
１５ロ−ラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rare gas discharge lamp, and more particularly to an improvement in the processing structure of a terminal derived from an end portion of an external electrode in a rare gas discharge lamp having a pair of strip-shaped external electrodes on the outer peripheral surface of a glass bulb.
[0002]
[Prior art]
A conventional rare gas discharge lamp of the related art is configured as shown in FIGS. That is, A is a straight tubular envelope made of a glass bulb, for example, and a light emitting layer B made of a phosphor such as a rare earth phosphor or a halophosphate phosphor is formed on the inner surface thereof. Note that a predetermined amount of a rare gas containing, as a main component, xenon gas not containing a metal vapor such as mercury, for example, is sealed in the inner space of the envelope A. On the other hand, a pair of strip-like external electrodes C and D made of an opaque metal member such as aluminum are attached to the outer peripheral surface of the envelope A so as to face each other. For example, it is covered and protected by a protective tube E made of a heat-shrinkable resin such as polyethylene terephthalate (PET) resin. Further, terminals F and F such as copper are led out from the ends of the external electrodes C and D by soldering with aluminum solder (hereinafter referred to as aluminum solder) G and G, for example. The lead-out portions of the terminals F and F are bent substantially in an L shape and are arranged on the end face side of the envelope A. An adhesive H having excellent insulating properties, such as a silicone resin, is injected and solidified between the lead-out portions, whereby the terminals F and F are fixed.
[0003]
In this rare gas discharge lamp, a high frequency high voltage (for example, 2500 Vo-p at 25 KHz) is applied to the external electrodes C and D to cause discharge of xenon gas, and the emission layer B is excited by the xenon gas excitation line to emit light. The light is emitted from the opening P between the end portions Ca and Da of the external electrodes C and D. In particular, since no mercury is used in this rare gas discharge lamp, the amount of light rising after lighting is steep, and the amount of light reaches almost 100% simultaneously with lighting. For this reason, it is suitable as a light source for reading originals in office automation equipment such as a facsimile, an image scanner, and a copying machine.
[0004]
[Problems to be solved by the invention]
However, since this rare gas discharge lamp is manufactured as follows, there is a problem that it is difficult to improve productivity.
[0005]
That is, first, as shown in FIGS. 14 to 15, the external electrodes C and D having the adhesive layer on one surface on the outer peripheral surface of the envelope A are manually operated so as to be separated from each other by a predetermined distance. Paste. Next, the terminals F and F are led out from the external electrodes C and D by soldering the terminals F and F to the ends of the external electrodes C and D with aluminum solders G and G, respectively. The external electrodes C and D can be attached to the outer peripheral surface of the envelope A after the terminals F and F are soldered to the external electrodes C and D. Next, the lead-out portions of the terminals F and F are bent substantially in an L shape so as to extend along the end face of the envelope A, and an adhesive H having excellent insulating properties is injected and solidified therebetween. Then, an external lead harness (not shown) is soldered to the end portions (portions adjacent to the adhesive H) of the terminals F, F. Next, after the envelope A is dipped in the silicon varnish solution and pulled up, the envelope varnish film is formed on the surface of the envelope A and the external electrodes C and D by, for example, drying for about 1 hour. The Thereafter, the protective tube E is put on the envelope A, and the protective tube E is heated to about 150 to 200 ° C. to be thermally contracted, so that the outer peripheral surface of the envelope A is covered with the protective tube E. A rare gas discharge lamp is manufactured by bringing the tube E into close contact.
[0006]
As described above, the manufacturing process of the rare gas discharge lamp includes a step of soldering the terminals F and F to the end portions of the external electrodes C and D with the aluminum solders G and G. , F is wide and the soldering area is wide, and is manually performed. Therefore, there is a large variation among workers, and the swell form of the aluminum solders G and G tends not to be constant. For example, when the aluminum solders G and G are greatly raised, the areas of the terminals F and F are large, so that the external electrodes C of the terminals F and F are attached in a state where the protective tube E is mounted as shown in FIG. The outer diameter of the soldered portion to D is locally larger than the outer diameter of the central portion of the envelope A.
[0007]
Recently, OA devices such as facsimiles, image scanners, and copiers have been miniaturized in response to requests from users and the like, and rare gas as a light source for document reading incorporated therein. Similarly, miniaturization is required for discharge lamps. Therefore, the clearance between the rare gas discharge lamp and the OA equipment at the installation site is extremely small.
[0008]
For this reason, there is no problem when the variation in the outer diameter of the rare gas discharge lamp is small over the entire length, but when the outer diameter of the rare gas discharge lamp is locally increased as described above, the rare gas discharge lamp is Has a problem that it cannot be incorporated into a predetermined part of the OA device.
[0009]
Further, in the above manufacturing process, after the terminals F and F are led out from the end portions of the external electrodes C and D, the lead-out portions are bent into an approximately L shape, and the adhesive H is injected and solidified therebetween. Although there is a process, the injection space portion of the adhesive H is formed in a portion where the pair of terminals F and F are opposed to each other, but there is no wall surface as a partition of the injection space portion in the portion adjacent to the terminals F and F. Therefore, it is necessary to work so that the adhesive H does not flow out of the injection space when the adhesive H is injected. For this reason, there also exists a problem that work becomes very complicated.
[0010]
In addition, since the above-described adhesive H does not solidify unless it is left for about 1 to 3 days after being injected between the terminals F and F, other work cannot be performed in the solidification process, and workability is improved. Significantly damaged. However, if the external lead harness is soldered to the terminals F and F before the adhesive H is completely solidified, the adhesive H is applied by the pressing force acting on the terminals F and F at that time. Some may flow out of the injection space. In particular, depending on the outflow method, a gap is formed between the terminals F and F, and the insulation between them may be significantly impaired. When operating in this state, a discharge is generated between the terminals F and F, and the rare gas discharge lamp cannot be lit. Therefore, in order to prevent the occurrence of such troubles, it is necessary to reliably fill the gap again with the adhesive H, and workability is impaired.
[0011]
Further, the rare gas discharge lamp is manufactured by, for example, a manual attaching process of the external electrodes C and D, a silicon varnish application-drying process, a protective tube E installation-a heat shrinking process, and the like. In addition, there are also problems that it is difficult to increase mass productivity because it has to go through many manufacturing processes.
[0012]
Therefore, it is an object of the present invention to reduce the variation in the form of the final product with a relatively simple configuration, improve productivity, and suppress the dielectric breakdown between terminals at the end of the envelope. The object is to provide a gas discharge lamp.
[0013]
[Means for Solving the Problems]
Therefore, in order to achieve the above-mentioned object, the present invention provides a straight tubular envelope having a light emitting layer on the inner surface, and a metal disposed on the outer peripheral surface of the envelope so as to be spaced substantially over the entire length thereof. A pair of strip-shaped external electrodes made of members, an electrical connection relationship with the external electrode, and a terminal derived from the end of the external electrode, and the outer peripheral surface of the envelope are covered with the external electrode A light-transmitting insulating member that is mounted, and the width of one end electrically connected to the external electrode of the terminal is set narrower than the width of the other end .
[0014]
Moreover, 2nd invention of this invention comprised the said translucent insulating member with the protective tube which consists of a translucent sheet | seat or heat shrinkable resin, It is characterized by the above-mentioned.
[0015]
According to a third aspect of the present invention, there is provided a metal member on one surface of a straight tubular envelope having a light emitting layer on the inner surface and a translucent sheet having a length substantially the same as the entire length of the envelope. A pair of strip-shaped external electrodes formed separately from each other, and a sheet structure in which terminals having an electrical connection relationship with the external electrodes are led out from the end portions of the external electrodes, and an outer periphery of the envelope The sheet structure is wound on the surface so that the external electrode is positioned between the envelope and the translucent sheet, and the width of one end electrically connected to the external electrode of the terminal is set to the other end. It is characterized by being set narrower than the width of the part.
[0016]
Furthermore, the fourth invention of the present invention is characterized in that a cut-and-raised portion is formed at a substantially central portion of the other end of the terminal.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a straight tubular envelope sealed with, for example, a glass bulb, and a light emitting layer 2 made of a phosphor such as a rare earth phosphor or a halophosphate phosphor is formed on the inner surface thereof. Is formed. In particular, the sealing structure of the envelope 1 is configured by sealing disc-shaped sealing glass plates 1a and 1b at the ends of the glass bulb. For example, the diameter of the glass bulb is reduced while heating the glass bulb. It can also be configured by fusing. The sealed space of the envelope 1 contains a single or mixed rare gas such as xenon (Xe), krypton (Kr), neon (Ne), helium (He) that does not contain metal vapor such as mercury. However, it is desirable to enclose a rare gas mainly composed of xenon at a pressure of 20 to 110 Torr, for example.
[0018]
The sheet structure 3 is wound around the outer peripheral surface of the envelope 1 so as to be in close contact therewith. The sheet structure 3 has, for example, a translucent sheet 4 having a length substantially the same as the entire length of the envelope 1 and a thickness set in a range of 20 to 100 μm. A pair of band-shaped external electrodes 5 and 6 made of a non-transparent metal member bonded to one surface of the optical sheet 4 with a predetermined distance from each other, and the external electrodes 5 and 6 Terminals 51 and 61 having an electrical connection relationship with the terminal 51 and 61 led out from the edge portion of the light-transmitting sheet 4 and one of the light-transmitting sheets 4 It is comprised from the adhesion layer 9 which has the adhesion thru | or adhesion | attachment function provided to the surface. The adhesive layer 9 is preferably a silicone adhesive, but an acrylic adhesive can also be used. In particular, the adhesive layer 9 is also formed on the exposed surface of the external electrodes 5 and 6, but it is formed in advance only on one surface of the translucent sheet 4 and applied to the exposed surface of the external electrodes 5 and 6. It can also be configured not to form. As the translucent sheet 4, for example, polyethylene terephthalate (PET) resin is suitable, but polyester resin or the like can also be used.
[0019]
Further, the external electrodes 5 and 6 and the terminals 51 and 61 are made of, for example, a metal member at a position where the corrosion potential row is separated. Preferably, the external electrodes 5 and 6 are made of a strip-shaped aluminum foil and the terminals 51. 61, copper having a shape described later is applied. However, as the external electrodes 5 and 6, a metal member such as nickel or silver can be used in addition to aluminum as long as the metal member is excellent in conductivity and opaque, and the terminals 51 and 61 are conductive. In addition to copper, metal members such as nickel, stainless steel, and Cu—Ni alloys can also be used as long as they are excellent and can be soldered to external lead harnesses. The external electrodes 5 and 6 and the terminals 51 and 61 are electrically connected by a connection method such as conductive adhesive, ultrasonic welding, caulking, welding, or soldering.
[0020]
In particular, in the sheet structure 3, the terminals 51 and 61 are set such that the width d of one end 51a, 61a electrically connected to the external electrodes 5 and 6 is narrower than the width g of the other end 51b, 61b. The lead-out portions from the external electrodes 5 and 6 are substantially L-shaped. Further, substantially L-shaped cut-and-raised portions 52 and 62 are formed at the other bent end portions 51b and 61b, and an external lead-out harness not shown is inserted into the cut-and-raised portions. Holes 52a and 62a are formed. The width d of one end 51a, 61a of the terminals 51, 61 may be set so that the relationship of 0.1W ≦ d ≦ 0.5W is established with respect to the width W of the external electrodes 5, 6. Desirably, the thickness of the terminals 51 and 61 is preferably in the range of 0.1 to 0.5 mm.
[0021]
The above-described sheet structure 3 is mounted on the outer peripheral surface of the envelope 1 so that the external electrodes 5 and 6 are positioned between the envelope 1 and the translucent sheet 4. In the second opening (8), the other end 4b is superposed on one end 4a of the translucent sheet 4 and bonded. In particular, when the sheet structure 3 is attached to the envelope 1, the first opening 7 is provided between the one ends 5 a and 6 a of the external electrodes 5 and 6, and the other ends 5 b and 6 of the external electrodes 5 and 6 are provided. A second opening 8 is formed between 6 b, and light from the light emitting layer 2 is mainly emitted from the first opening 7. The opening angles θ ₁ and θ ₂ of the first and second openings 7 and 8 are preferably set to have a relationship of θ ₁ > θ ₂ , but may be set to the same.
[0022]
Further, a cap 10 molded with an insulating member having excellent insulating properties (pressure resistance) and flame retardance is attached to the end surface (1a) of the envelope 1. The cap 10 is formed of, for example, polycarbonate resin. For example, the cap 10 includes a block-shaped cap main body 11 and a pair of L-shaped support pieces 12 and 12 integrally formed on a peripheral portion of the cap main body 11. It is configured. In particular, a hole 11a penetrating from the outer surface side to the inner surface side (end surface side of the envelope 1) is formed in the central portion of the cap body 11, and flat side portions 11b and 11b are formed in the outer peripheral portion. The cap 10 is disposed at the end of the envelope 1 such that the cap body 11 is positioned on the end face side of the envelope 1 and the support pieces 12 and 12 support the end of the envelope 1. The adhesive 13 having excellent insulating properties is solidified between the hole 11a and the cap body 11 and the end face (1a) of the envelope 1 and then solidified. As a result, the cap 10 is fixed (attached) to the envelope 1. In addition, the other end portions 51b and 61b of the terminals 51 and 61 led out from the external electrodes 5 and 6 are arranged on the side surface portions 11b and 11b of the cap 10 so as to be in close contact with each other. An external lead harness (not shown) is connected to the terminal portions located on the side portions 11b and 11b by soldering or the like.
[0023]
This rare gas discharge lamp is manufactured as follows, for example. First, as shown in FIG. 10, the sheet structure 3 is placed in a predetermined position, for example, an assembly stage 14 in a developed state. Next, the envelope 1 is placed on one end 4a of the translucent sheet 4 of the sheet structure 3 so that the longitudinal direction of the envelope 1 is along the longitudinal direction of the external electrodes 5 and 6 (parallel). Position). In this state, the pair of rollers 15 and 15 that are driven to rotate are set so as to press against the envelope 1. As a result, the envelope 1 is slightly pressed against the translucent sheet 4. In this state, when the stage 14 is slightly moved in the M direction shown in the drawing and then moved in the N direction, the envelope 1 is moved by the driven rotation of the rollers 15 and 15 so that the translucent sheet 4 is moved. Will roll in the direction of the other end 4b. As a result, as shown in FIG. 6, the sheet structure 3 is wound around the outer peripheral surface of the envelope 1, and the other end 4b is overlapped with the one end 4a of the translucent sheet 4 so as to adhere. Bonded by layer 9. In addition, when using a thermosetting adhesive agent for the contact bonding layer 9, it is desirable to heat-process. Next, after the adhesive 13 is applied to the inner surface side of the cap 10, the cap 10 is placed on the end of the envelope 1, and the inner surface side of the cap body 11 is placed on the end surface (1 a of the envelope 1 through the adhesive 13. And the support pieces 12 and 12 are mounted so as to sandwich the end portion of the envelope 1. At this time, the other end portions 51 b and 61 b of the terminals 51 and 61 are disposed so as to be substantially in contact with the side surface portions 11 b and 11 b of the cap 10. At this stage, the cap 10 is temporarily fixed to the envelope 1. Next, the adhesive 13 is injected from the hole 11a of the cap 10, and the gap portion between the hole 11a and the inner surface side of the cap body 11 and the end surface (1a) of the envelope 1 is enriched. Thereafter, the adhesive 13 is solidified. In addition, application | coating and injection | pouring of the adhesive agent 13 can also be performed after attaching the cap 10 to the edge part of the envelope 1. FIG. The cap 10 is attached to the end of the envelope 1 so that the support pieces 12 and 12 are covered with the translucent sheet 4 disposed so as to be located to the end of the envelope 1. It can also be attached to.
[0024]
According to this embodiment, the terminals 51 and 61 are such that the width d of one end 51a, 61a electrically connected to the external electrodes 5, 6 is narrower than the width g of the other end 51b, 61b. Therefore, even if one end 51a, 61a is connected to the external electrodes 5, 6 using solder, a conductive adhesive or the like, the same portion does not rise undesirably, The outer diameter of the final product can be homogenized over almost the entire length of the envelope 1. Therefore, in the OA equipment, even if the installation space of the rare gas discharge lamp is considerably restricted, it can be reliably installed.
[0025]
In particular, if the relationship between the width W of the external electrodes 5 and 6 and the width d of one end 51a, 61a of the terminals 51, 61 is set to 0.1W ≦ d ≦ 0.5W, the external electrodes 5, 6 And the occurrence of contact corrosion of dissimilar metals at the connection portions between the terminals 51 and 61 can be suppressed. Accordingly, it is possible to maintain a stable operation state over a long period of time. However, when the width d of the terminals 51 and 61 is less than 0.1 W, the contact area between the external electrodes 5 and 6 and the terminals 51 and 61 becomes too small to make it difficult to maintain a stable connection state. If the width d exceeds 0.5 W, the terminals 51 and 61 are less likely to follow the outer peripheral surface of the envelope 1 when the sheet structure 3 is wound around the envelope 1. Therefore, it is desirable to set both in the above relationship.
[0026]
In addition, the other end portions 51b and 61b of the terminals 51 and 61 are set so that the width g is wider than the width d of the one end portions 51a and 61a, and the portions 51 and 61 are cut and raised by the same portions. Since the holes 52a and 62a are formed, the external lead-out harness can be soldered in the inserted state. Therefore, the connectivity of the harness can be improved.
[0027]
Further, since the cap 10 attached to the end of the envelope 1 is configured in a resin-molded solid state, the cap 10 is attached to the envelope 1 and the support pieces 12 and 12 (or adhesive 13). Can be easily temporarily fixed using Therefore, at the same time when the cap 10 is attached to the envelope 1, the other end portions 51b and 61b of the terminals 51 and 61 can be arranged on the side surface portions 11b and 11b of the cap 10 and immediately the other end of the terminals 51 and 61 can be arranged. Even if the outer lead-out harnesses are soldered to the end portions 51b and 61b, there is no trouble that a gap is formed in the adhesive and dielectric breakdown occurs as in the conventional case, and a series of operations are continuously performed. Can be carried out and productivity can be increased.
[0028]
In addition, the adhesive 13 having excellent insulating properties is formed between the cap body 11 and the end surface (1a) of the envelope 1 and in the hole 11a so that no gap is formed at least at the portions where the terminals 51 and 61 are opposed to each other. Therefore, even if it is operated in a harsh environment, it is possible to reliably prevent generation of discharge due to dielectric breakdown between terminals.
[0029]
On the other hand, according to the manufacturing method described above, the external electrodes 5 and 6 can be attached to the outer peripheral surface of the envelope 1 simply by rolling the envelope 1 on the sheet structure 3. However, since the external electrodes 5 and 6 are arranged on the translucent sheet 4 in advance at a predetermined interval, the interval between the external electrodes 5 and 6 is adjusted to be a predetermined interval at the time of attachment. There is no necessity, and work efficiency can be remarkably improved even if it is manual work. Specifically, the conventional method required 60 minutes for production, but according to the method of the present invention, it can be shortened to about 1 minute.
[0030]
Further, since the adhesive layer 9 is formed on one surface of the light-transmitting sheet 4 in the sheet structure 3, the envelope 1 is simply rolled on the sheet structure 3. By the simple operation, the sheet structure 3 can be wound and brought into close contact with the outer peripheral surface of the envelope 1. Therefore, not only can the work efficiency be dramatically improved, but also mechanization becomes possible, and a further mass production effect can be expected.
[0031]
In addition, when the sheet structure 3 is wound and adhered to the outer peripheral surface of the envelope 1, the end portions 4a and 4b of the translucent sheet 4 are overlapped and bonded to each other. The covering reliability of the electrodes 5 and 6 can be increased. In particular, when the thickness of the translucent sheet 4 is set in the range of 20 to 100 μm, stable polymerization and adhesion of the end portions 4a and 4b can be obtained. However, if the thickness is less than 20 μm, sufficient insulation cannot be ensured. Conversely, if the thickness exceeds 100 μm, the sheet is stiff and the overlapping portions of the end portions 4 a and 4 b are easily peeled off. Also, winding work becomes troublesome. Therefore, it is desirable to set the sheet thickness within the above range.
[0032]
Furthermore, the external electrodes 5 and 6 are arranged so as to be positioned between the translucent sheet 4 and the outer peripheral surface of the envelope 1 when the sheet structure 3 is mounted on the envelope 1. Therefore, even when applied to OA equipment such as a facsimile and a high voltage is applied at the time of use, not only the external electrodes but also the ground-to-ground insulation can be sufficiently secured.
[0033]
FIG. 11 shows a second embodiment of the present invention, and the basic configuration is the same as that of the rare gas discharge lamp shown in FIGS. The difference is that the other end 51b of the terminal 51A is simply bent into an L shape, and the cut and raised portion is omitted.
[0034]
According to this embodiment, since it is not necessary to form the cut-and-raised portion 52 as in the first embodiment, the structure of the terminal 51A is simplified, the manufacturing is simplified, and the cost is also increased. It can be effectively reduced.
[0035]
FIG. 12 shows a third embodiment of the present invention, and the basic configuration is the same as that of the rare gas discharge lamp shown in FIGS. The difference is that an aperture portion (light emitting portion) 2 a that does not form the light emitting layer 2 is formed on the inner surface portion of the envelope 1 corresponding to the first opening 7, and the translucent sheet 4. The main overlapping portions of the end portions 4 a and 4 b are set on the outer surface side of the external electrode 5. In addition, although the opening angle of the aperture part 2a is set in the range of 70-110 degree | times, it can be suitably changed according to a use, a purpose, etc. Further, the overlapping portion of the end portions 4 a and 4 b can be on the outer surface side of the external electrode 6.
[0036]
According to this embodiment, the light emitted from the light emitting layer 2 is densified in the envelope and is emitted from the aperture portion 2a to the outside through the first opening portion 7. When applied to the apparatus, the illuminance of the original surface can be increased, and the reading accuracy of the original can be increased.
[0037]
In particular, if light reflectivity is imparted to the surface of the external electrodes 5 and 6 on the envelope side, the illuminance of the aperture portion 2a can be further increased, and the document reading accuracy can be further improved. As a material for this, a metal member having light reflectivity such as an aluminum foil is suitable.
[0038]
Further, when ultrasonically welding the overlapping portions of the end portions 4a and 4b of the translucent sheet 4, since the ultrasonic vibration is alleviated by the external electrode 5, light is emitted from the inner surface of the envelope. The peeling of the layer 2 can be effectively suppressed. Therefore, the uniformity of the illuminance distribution can be improved.
[0039]
A fourth embodiment of the present invention will be described using the third embodiment shown in FIG. In this embodiment, after a pair of external electrodes 5 and 6 are attached to the outer peripheral surface of the envelope 1, the translucent sheet 4 is coated on the outer peripheral surface of the envelope 1 with the external electrodes 5 and 6. In addition, the end portions 4a and 4b of the translucent sheet 4 are overlapped and fixed (adhesion, ultrasonic welding, etc.). In addition, the electrical connection of the terminals 51 and 61 to the external electrodes 5 and 6 may be performed before or after the external electrodes 5 and 6 are attached to the envelope 1. A terminal 51A shown in FIG.
[0040]
According to this embodiment, compared with the above-described embodiments, although it is inferior in mechanization and work efficiency, it can be improved over the conventional example. In particular, if an insulating film such as silicon varnish is formed in advance on the outer peripheral surface of the envelope 1 prior to winding of the translucent sheet 4, further improvement of the insulating property is possible.
[0041]
It should be noted that the present invention is not limited to the above-described embodiment. For example, the terminal only needs to have a width at one end narrower than the width at the other end. It can also be configured into a shape. Further, the shape of the cap can be changed as appropriate. For example, the number of support pieces is increased, the part of the support piece is formed in a cylindrical shape over the entire circumference, or the side surface portion of the cap body is formed in a substantially circular shape substantially the same as the outer diameter of the envelope. You can also. In addition, the cap can be molded from ceramics or the like in addition to the resin material. Further, the cap can be attached to both ends of the envelope. In this case, the terminal derivation process is performed on one of the caps, but can be performed separately at both ends. In particular, the sheet structure is adhered to the outer peripheral surface of the envelope by rotating the sheet structure on the sheet structure and rotating the sheet structure. They can also be used together.
[0042]
【The invention's effect】
As described above, according to the present invention, the terminal is configured such that the width d of one end electrically connected to the external electrode is narrower than the width g of the other end. Even if one end is connected to the external electrode using solder, conductive adhesive or the like, the same portion will not rise undesirably, and the outer diameter of the final product will be almost the entire length of the envelope. Can be homogenized. Therefore, in the OA equipment, even if the installation space of the rare gas discharge lamp is considerably restricted, it can be reliably installed.
[0043]
In addition, since the width g of the other end portion of the terminal is set wider than the width d of the one end portion, the connectivity and the connection strength due to soldering of the external derivation harness etc. are improved. Can do. In particular, if a cut-and-raised part is formed in the same portion, the connectivity of the harness can be further improved because the harness can be connected after being inserted into the hole by the cut-and-raised.
[0044]
In particular, if the relationship between the width W of the external electrode and the width d of one end of the terminal is set to 0.1 W ≦ d ≦ 0.5 W, the contact corrosion of dissimilar metals at the connection portion between the external electrode and the terminal is caused. Generation can be suppressed. Therefore, it is possible to maintain a stable operation state over a long period of time.
[0045]
Further, if the resin-molded solid cap is attached to the end portion of the envelope, the cap can be easily temporarily fixed to the envelope using an adhesive. Therefore, at the same time when the cap is mounted on the envelope, the other end of the terminal can be disposed on the side surface of the cap, and a harness for external derivation is immediately connected to the other end of the terminal. However, the conventional trouble that a gap is formed in the adhesive and the dielectric breakdown does not occur at all does not occur, and a series of operations can be continuously performed, and productivity can be improved.
[0046]
In addition, a hole is formed in the cap body, and an adhesive having excellent insulating properties is formed between the cap body and the end face of the envelope and in the hole so that a gap is not formed at least at the opposite part of the terminal. For example, even when operated in a harsh environment, the occurrence of discharge due to dielectric breakdown between the terminals can be reliably prevented, and a stable operating state can be obtained.
[0047]
On the other hand, if a sheet structure in which a pair of external electrodes are arranged on a translucent sheet is used, the external electrode can be removed by simply rolling the envelope on the sheet structure. Can be easily attached to the outer peripheral surface of the envelope. Therefore, not only can the work efficiency be dramatically improved, but also mechanization becomes possible, and a further mass production effect can be expected.
[0048]
Further, since the external electrode is considered to be positioned between the translucent sheet and the outer peripheral surface of the envelope when the sheet structure is attached to the envelope, Even when a high voltage is applied during use by being applied to an OA device such as the above, it is possible to sufficiently ensure insulation between grounds as well as between external electrodes.
[Brief description of the drawings]
FIGS. 1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a side view of a partially broken state of a main part, and FIG. 1B is a perspective view of a terminal.
FIG. 2 is a front view of FIG.
3 is a cross-sectional view taken along the line VV in FIG.
4 is a cross-sectional view taken along the line WW in FIG. 2;
FIG. 5 is a perspective view of a cap according to the present invention.
6 is a cross-sectional view taken along line XX in FIG.
FIG. 7 is a side view of the partially broken state of FIG.
FIG. 8 is a development view of the sheet structure according to the present invention.
9 is a YY cross-sectional view of FIG.
FIG. 10 is a longitudinal sectional view for explaining the method of the present invention.
FIGS. 11A and 11B are views showing a second embodiment of the present invention, in which FIG. 11A is a side view of a principal part in a partially broken state, and FIG. 11B is a perspective view of a terminal.
FIG. 12 is a longitudinal sectional view showing a third embodiment of the present invention.
FIG. 13 is a longitudinal sectional view of a conventional example.
FIG. 14 is a perspective view for explaining a conventional method.
15 is a ZZ cross-sectional view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Envelope 2 Light emitting layer 3 Sheet structure 4 Translucent sheet | seat 4a, 4b End part 5 and 6 External electrode 51, 51A, 61 Terminal 51a, 61a One edge part 51b, 61b The other edge part 52 , 62 Cut-and-raised part 52a, 62a Hole 9 Adhesive layer 10 Cap 11 Cap body 11a Hole 11b Side face part 13 Adhesive 14 Stage 15 Roller

Claims

A straight tubular envelope having a light emitting layer on the inner surface, a pair of strip-shaped external electrodes made of a metal member disposed on the outer peripheral surface of the envelope and spaced substantially over the entire length thereof, an external electrode and an electric A terminal that has a general connection relationship and that is led out from an end thereof, and a translucent insulating member that is mounted on the outer peripheral surface of the envelope so that the external electrode is covered with the terminal. A rare gas discharge lamp characterized in that the width of one end electrically connected to the external electrode is set narrower than the width of the other end.

2. The rare gas discharge lamp according to claim 1, wherein the translucent insulating member is constituted by a protective tube made of a translucent sheet or a heat-shrinkable resin.

A pair of strip-shaped external electrodes made of a metal member are separated from each other on one surface of a straight tubular envelope having a light emitting layer on the inner surface and a translucent sheet having a length substantially the same as the entire length of the envelope. And a sheet structure in which a terminal having an electrical connection relationship with the external electrode is led out from an end of the external electrode, and the sheet structure is disposed on the outer peripheral surface of the envelope. The outer electrode is wound so as to be positioned between the light-sensitive sheet and the width of one end electrically connected to the external electrode of the terminal is set to be narrower than the width of the other end. Noble gas discharge lamp.

4. The rare gas discharge lamp according to claim 1 , wherein a cut and raised portion is formed at a substantially central portion of the other end of the terminal.