JP4294262B2 - Discharge lamp with reflector and method of manufacturing discharge lamp with reflector - Google Patents

Discharge lamp with reflector and method of manufacturing discharge lamp with reflector Download PDF

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JP4294262B2
JP4294262B2 JP2002139739A JP2002139739A JP4294262B2 JP 4294262 B2 JP4294262 B2 JP 4294262B2 JP 2002139739 A JP2002139739 A JP 2002139739A JP 2002139739 A JP2002139739 A JP 2002139739A JP 4294262 B2 JP4294262 B2 JP 4294262B2
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center
arc tube
reflecting mirror
light emitting
elliptical
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JP2003331603A (en
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雅夫 狩野
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オスラム・メルコ株式会社
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Description

【０００１】
【発明の属する技術分野】
この発明は、液晶プロジェクター等の投影機器に使用される反射鏡付放電ランプに関する。
【０００２】
【従来の技術】
図６は、従来の反射鏡付放電ランプの一例を表す略断面図である。
図６に示した反射鏡付放電ランプは、以下の要素から構成される。
１０は発光管、１１は発光部、１２はＦ電極、１３はＲ電極、１４は水銀、１５はＦモリブデン箔、１６はＲモリブデン箔、１７はＦリード線、１８はＲリード線、２０は楕円反射鏡、２１は開口部、２２は底部、２５は焦点である。Ｆ電極１２とＲ電極１３は、一対の電極を構成する。
【０００３】
次に、構造について説明する。
Ｆリード線１７が溶接されたＦモリブデン箔１５を溶接したＦ電極１２と、Ｒリード線１８が溶接されたＲモリブデン箔１６を溶接したＲ電極１３と、水銀１４とを封入した略球状の発光部１１を中央部に有する発光管１０の中心軸を、Ｆ電極１２を楕円反射鏡２０の開口部２１側にＲ電極１３を底部２２側にして楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させ、発光部１１の中心を楕円反射鏡２０の焦点２５に一致させて発光管１０を楕円反射鏡２０に組み込んだ構造である。
【０００４】
次に、動作について説明する。
Ｆリード線１７とＲリード線１８に駆動電圧が印加されると、発光部１０のＦ電極１２とＲ電極１３との間の放電により水銀１４が励起されて発光する。Ｆ電極１２とＲ電極１３の間で発生して発光部１１から放射される光は、次のような光路を経て楕円反射鏡２０から外部へ放射される。
【０００５】
図７は、図６に示した従来の反射鏡付放電ランプの光路を示す図である。
図７において、Ｆ１は楕円反射鏡内部の焦点、Ｆ２は楕円反射鏡外部の焦点である。Ａ，Ｂ，Ｃは、いずれも電極間における発光であって、その発光位置が異なる放射光の光路を示す。
【０００６】
光路Ａは、焦点Ｆ１における発光で、楕円反射鏡２０で反射して焦点Ｆ２へと向かう。
光路Ｂは、焦点Ｆ１と底部２２側のＲ電極１３との間における発光で、光路Ａと同じ楕円反射鏡２０の点で反射して焦点Ｆ２の近傍を通過する。
光路Ｃは、焦点Ｆ１と開口部２１側のＦ電極１２との間における発光で、光路Ａと同じ楕円反射鏡２０の点で反射して焦点Ｆ１と焦点Ｆ２を結ぶ直線の方向へと向かう。楕円反射鏡で反射後の光路Ｃの方向には発光管１０が位置するため、発光点の位置や放射角度によっては図７に示すように反射光が発光管１０へ再入射する。
【０００７】
【発明が解決しようとする課題】
従来の反射鏡付放電ランプでは、焦点２５とＦ電極１２の間で発光して楕円反射鏡２０で反射した光が発光管１０へ再入射するため、発光管１０の加熱による劣化やＦモリブデン箔１５の酸化が加速される。このため、発光管１０の破損やＦモリブデン箔１５の断線が生じてランプ短寿命の原因となっていた。
【０００８】
そこで、楕円反射鏡で反射した後、発光管へ再入射する反射光を低減し、発光管の破損やモリブデン箔の断線を防止してランプを長寿命化する構造のランプを提供することを目的とする。
【０００９】
【課題を解決するための手段】
この発明に係る反射鏡付放電ランプは、略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記発光管は、発光部の中心が楕円反射鏡の焦点より底部側になるように配置されたことを特徴とする。
【００１０】
この発明に係る反射鏡付放電ランプは、内部に一対の電極を封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記一対の電極は、発光部の中心に対して非対称に配置されることによって、発光管の中心からの距離が近くかつ楕円反射鏡の開口部に近い電極と、発光管の中心からの距離が遠くかつ楕円反射鏡の底部に近い電極とを形成し、
上記発光管は、上記発光部の中心と上記楕円反射鏡焦点とが一致するように配置されたこと特徴とする。
【００１１】
この発明に係る反射鏡付放電ランプは、内部に一対の電極を封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記一対の電極は、発光部の中心に対して非対称に配置されることによって、発光管の中心からの距離が近くかつ楕円反射鏡の開口部に近い電極と、発光管の中心からの距離が遠くかつ楕円反射鏡の底部に近い電極とを形成し、
上記発光管は、発光部の中心が楕円反射鏡の焦点より底部側になるように配置されたことを特徴とする。
【００１２】
この発明に係る反射鏡付放電ランプの製造方法は、略球状の発光部を中央部分に有する発光管と楕円反射鏡とを有する反射鏡付放電ランプの製造方法において、
上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させ、
発光部の中心が楕円反射鏡の焦点より底部側に配置されるように、上記発光管を上記楕円反射鏡へ組み込むことを特徴とする。
【００１３】
この発明に係る反射鏡付放電ランプの製造方法は、内部に一対の電極を封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを有する反射鏡付放電ランプの製造方法において、
上記一対の電極が、発光部の中心からの距離が近い電極と発光部の中心からの距離が遠い電極とになるように、上記一対の電極を発光部の中心に対して非対称に配置して封入し、
上記発光部からの距離が近い電極が、上記楕円反射鏡の開口部に近くなるように、上記発光管を配置し、
上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させ、
上記発光部の中心と上記楕円反射鏡焦点とが一致するように、上記発光管を上記楕円反射鏡へ組み込むことを特徴とする。
【００１４】
この発明に係る反射鏡付放電ランプの製造方法は、内部に一対の電極を封入した略球状の発光部を中央部分に有する反射鏡付放電ランプの製造方法において、
上記一対の電極が、発光部の中心からの距離が近い電極と発光部の中心からの距離が遠い電極とになるように、上記一対の電極を発光部の中心に対して非対称に配置して封入し、
上記発光部からの距離が近い電極が、上記楕円反射鏡の開口部に近くなるように、上記発光管を配置し、
上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させ、
発光部の中心が楕円反射鏡の焦点より底部側になるように、上記発光管を上記楕円反射鏡へ組み込むことを特徴とする。
【００１５】
この発明に係る反射鏡付放電ランプは、内部に一対の電極を封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記一対の電極は、上記楕円反射鏡焦点に対して、上記一対の電極の中心が上記楕円反射鏡の底部に偏るように配置されていることを特徴とする。
【００１６】
この発明に係る反射鏡付放電ランプの製造方法は、内部に一対の電極を封入した略球状の発光部を中央部分に有する反射鏡付放電ランプの製造方法において、
上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させ、
上記一対の電極は、上記楕円反射鏡焦点に対して、上記一対の電極の中心が上記楕円反射鏡の底部に偏るように配置されるように、上記発光管を上記楕円反射鏡へ組み込むことを特徴とする。
【００１７】
上記発光管は、上記一対の電極を発光部の中心に対して非対称に配置させることを特徴とする。
【００１８】
【発明の実施の形態】
実施の形態１．
図１は、実施の形態１の反射鏡付放電ランプの一例を表した略断面図である。
図１に示した反射鏡付放電ランプは、以下の要素から構成される。
１０は発光管、１１は発光部、１２はＦ電極、１３はＲ電極、１４は水銀、１５はＦモリブデン箔、１６はＲモリブデン箔、１７はＦリード線、１８はＲリード線、２０は楕円反射鏡、２１は開口部、２２は底部、２５は焦点である。Ｆ電極１２とＲ電極１３は、一対の電極を構成する。
【００１９】
次に、構造について説明する。
発光管１０は、Ｆリード線１７が溶接されたＦモリブデン箔１５を溶接したＦ電極１２と、Ｒリード線１８が溶接されたＲモリブデン箔１６を溶接したＲ電極１３と、水銀１４とを封入した略球状の発光部１１を中央部（中央部分）に有する。
楕円反射鏡２０は、回転楕円体形状の一部分の形をしている。
発光管１０は、Ｆ電極１２を楕円反射鏡２０の開口部２１側に、Ｒ電極１３を底部２２側にして配置させる。
発光管１０の中心軸を、楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させ、発光部１１の中心を楕円反射鏡２０の焦点２５より底部２２側にシフトさせて発光管１０を楕円反射鏡２０に組み込んだ構造とする。
【００２０】
基本的な動作は、従来の技術で説明した動作と同様であるため省略する。
反射鏡付放電ランプの構造を、発光管１０の中心が楕円反射鏡２０の焦点２５より底部２２側に移動させることにより、一対の電極が楕円反射鏡２０の焦点２５に対して、底部に偏るように非対称に配置される。一対の電極の中心（Ｆ電極１２とＲ電極１３との間の中心点）が、楕円反射鏡２０の焦点２５に対して、底部２２側に配置される。これにより、楕円反射鏡２０の開口部２１側の光路の発光を低減することができる。したがって、楕円反射鏡２０で反射して発光管１０へ再入射する光が軽減されることになる。
【００２１】
以上のように、この実施の形態では、内部に一対の電極１２，１３と水銀を封入した略球状の発光部１１を中央部に有する発光管１０の中心軸を楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させて組み込み構成された反射鏡付放電ランプにおいて、発光部１１の中心を楕円反射鏡２０の焦点より底部２２側にシフトさせて発光管１０を楕円反射鏡２０に組み込んで構成したことを特徴とする反射鏡付放電ランプについて説明した。
【００２２】
実施の形態２．
図２は、実施の形態２の反射鏡付放電ランプの一例を示した略断面図である。
図２の示した反射鏡付放電ランプの構成は、実施の形態１の図１と同様であるため省略する。
【００２３】
次に、構造について説明する。
発光管１０は、Ｆリード線１７が溶接されたＦモリブデン箔１５を溶接したＦ電極１２と、Ｒリード線１８が溶接されたＲモリブデン箔１６を溶接したＲ電極１３と、水銀１４とを封入した略球状の発光部１１を中央部分に有する。
楕円反射鏡２０は、回転楕円体形状の一部分の形をしている。
発光部１１に封入された一対の電極（Ｆ電極１２とＲ電極１３）は、発光部１１の中心に対して非対称に配置される。発光部１１の中心からＦ電極１２の距離は短く、Ｒ電極１３の距離は長くして、Ｆ電極１２を楕円反射鏡２０の開口部２１側にＲ電極１３を底部２２側にして配置させた。
上記のように一対の電極を配置した発光管１０の中心軸を、楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させ、発光部１１の中心を楕円反射鏡２０の焦点２５と一致させて組み込んだ構造とする。
【００２４】
基本的な動作は、従来の技術で説明した動作と同様であるため省略する。
反射鏡付放電ランプの構造を、発光部１１の中心からＦ電極１２の距離は短く、Ｒ電極１３の距離は長くして発光部１１に封入することにより、一対の電極が楕円反射鏡２０の焦点に対して、底部２２に偏るように非対称に配置される。これにより、楕円反射鏡２０の開口部２１側の光路の発光を低減することができる。
【００２５】
以上のように、この実施の形態では、内部に一対の電極１２，１３と水銀を封入した略球状の発光部１１を中央部に有する発光管１０の中心軸を楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させて組み込み構成された反射鏡付放電ランプにおいて、一対の電極１２，１３を発光部１１の中心に対し非対称に配置した発光管１０を、中心からの距離が近いほうの電極を楕円反射鏡２０の開口部２１側、中心から遠いほうの電極を楕円反射鏡２０の底部２２側とし、発光部１１の中心を楕円反射鏡焦点と一致させて組み込んだことを特徴とする反射鏡付放電ランプについて説明した。
【００２６】
実施の形態３．
図３は、実施の形態２の反射鏡付放電ランプの一例を示した略断面図である。
図３の示した反射鏡付放電ランプの構成は、実施の形態１の図１と同様であるため省略する。
【００２７】
次に、構造について説明する。
発光管１０は、Ｆリード線１７が溶接されたＦモリブデン箔１５を溶接したＦ電極１２と、Ｒリード線１８が溶接されたＲモリブデン箔１６を溶接したＲ電極１３と、水銀１４とを封入した略球状の発光部１１を中央部分に有する。
楕円反射鏡２０は、回転楕円体形状の一部分の形をしている。
発光部１１に封入された一対の電極（Ｆ電極１２とＲ電極１３）は、発光部１１の中心に対して非対称に配置される。発光部１１の中心からＦ電極１２の距離は短く、Ｒ電極１３の距離は長くして、Ｆ電極１２を楕円反射鏡２０の開口部２１側にＲ電極１３を底部２２側にして配置させた。
上記のように一対の電極を配置した発光管１０の中心軸を、楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させ、かつ、発光部１１の中心を楕円反射鏡２０の焦点２５より底部２２側にシフトさせて発光管１０を楕円反射鏡２０に組み込んだ構造とする。
【００２８】
基本的な動作は、従来の技術で説明した動作と同様であるため省略する。
反射鏡付放電ランプの構造を、発光部１１の中心からＦ電極１２の距離は短く、Ｒ電極１３の距離は長くして発光部１１に封入するとともに、中心を楕円反射鏡２０の焦点２５より底部２２側にシフトさせることにより、一対の電極が楕円反射鏡２０の焦点２５に対して、底部２２に偏るように非対称に配置される。これにより、楕円反射鏡２０の開口部２１側の光路の発光を低減することができる。
【００２９】
以上のように、この実施の形態では、内部に一対の電極１２，１３と水銀を封入した略球状の発光部１１を中央部に有する発光管１０の中心軸を楕円反射鏡２０の開口部２１と底部２２を結ぶ中心軸に一致させて組み込み構成された反射鏡付放電ランプにおいて、一対の電極１２，１３を発光部１１の中心に対し非対称に配置した発光管１０を、中心からの距離が近いほうの電極を楕円反射鏡２０の開口部２１側、中心から遠いほうの電極を楕円反射鏡２０の底部２２側とし、発光部１１の中心を楕円反射鏡２０の焦点２５より底部２２側にシフトさせて組み込んで構成したことを特徴とする反射鏡付放電ランプについて説明した。
【００３０】
実施例１．
図４は、発光管の温度を測定するランプの構成を示した概略図である。
実験では、下記に示す反射鏡付放電ランプを用いた。
楕円鏡長軸：３０ｍｍ
短軸：１９ｍｍ
楕円鏡前長（焦点〜開口端）：１５ｍｍ
発光管径：６ｍｍ
発光部径：９ｍｍ
発光管前長（発光部中心〜発光管前端）：２５ｍｍ
発光管入力：１２０Ｗ
【００３１】
図４中、−シフト（マイナスシフト）は、マイナスの数値を指定してシフトする場合であり、矢印の方向（図４中の楕円反射鏡の底部部側）へ、発光管、あるいは、電極をシフトさせることを示す。
また、＋シフト（プラスシフト）は、プラスの数値を指定してシフトする場合であり、矢印の方向（図４中の楕円反射鏡の開口部側）へ、発光管、あるいは、電極をシフトさせることを示す。
温度は、図４中の温度測定点で示すように、発光管の外側の温度を測定した。
【００３２】
図５は、図４に示した構成のランプを用いて、発光管、あるいは、電極をシフトさせて、発光管の温度を測定した結果である。
図５では、一対の電極の間隔が１．３ｍｍの場合の例を示している。
図５の表の横の列は、発光管をシフトさせる数値を−０．４から０．４まで変化させた結果を示している。また、縦の行は、電極をシフトさせる数値を−０．４から０．４まで変化させた結果を示している。
シフトの数値が０（ゼロ）の場合が、従来の反射鏡付放電ランプと同様の場合を示している。すなわち、発光管と電極とのシフトの数値がいずれも０の場合であり、発光管温度は、３４９℃である。
図５の結果によると、発光管と電極のいずれか一方、あるいは、両方とも、−側へシフトさせた場合は、発光管温度が３４９℃より小さい値が得られた。
【００３３】
発光管温度は、発光管が高温になるほど、劣化やモリブデン箔の酸化が進み短寿命になる。従って、温度は低いほど好ましいことになる。ただし、発光管の温度に関わらず発光部は電極の消耗を抑えるため８００〜１０００℃に保つ必要がある。
また、図５は、発光管温度に着目して実験を実施した結果の一例を示した数値であり、楕円反射鏡の底部側へ発光管、電極をシフトするほど発光管へ再入射する反射光が低減するため、発光管温度は低くなることになる。
【００３４】
【発明の効果】
発光管の底部側へのシフト、発光部中心から開口部側電極までの距離の短縮、さらに、発光管シフトと発光部中心から開口部側電極までの距離の短縮との組み合わせにより楕円反射鏡の焦点より開口部側の発光を低減したので、楕円反射鏡で反射して発光管へ再入射する光が軽減され、再入射光の加熱による発光管の破損やモリブデン箔の断線を防止できランプを長寿命化することができる。
【図面の簡単な説明】
【図１】 実施の形態１の反射鏡付放電ランプの一例を示す略断面図。
【図２】 実施の形態２の反射鏡付放電ランプの一例を示す略断面図。
【図３】 実施の形態３の反射鏡付放電ランプの一例を示す略断面図。
【図４】 発光管の温度を測定する反射鏡付放電ランプの構成を示す概略図。
【図５】 発光管の温度の測定結果を表す図。
【図６】 従来の反射鏡付放電ランプの一例の略断面図。
【図７】 従来の楕円反射鏡の光路を示す図。
【符号の説明】
１０ 発光管、１１ 発光部、１２ Ｆ電極、１３ Ｒ電極、１４ 水銀、１５ Ｆモリブデン箔、１６ Ｒモリブデン箔、１７ Ｆリード線、１８ Ｒリード線、２０ 楕円反射鏡、２１ 開口部、２２ 底部、２５ 焦点、Ａ，Ｂ，Ｃ放射光の光路、Ｆ１ 楕円反射鏡内部焦点、Ｆ２ 楕円反射鏡外部焦点。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge lamp with a reflector used in a projection apparatus such as a liquid crystal projector.
[0002]
[Prior art]
FIG. 6 is a schematic cross-sectional view showing an example of a conventional discharge lamp with a reflecting mirror.
The discharge lamp with a reflector shown in FIG. 6 includes the following elements.
10 is an arc tube, 11 is a light emitting section, 12 is an F electrode, 13 is an R electrode, 14 is mercury, 15 is an F molybdenum foil, 16 is an R molybdenum foil, 17 is an F lead wire, 18 is an R lead wire, and 20 is An elliptical reflecting mirror, 21 is an opening, 22 is a bottom, and 25 is a focal point. The F electrode 12 and the R electrode 13 constitute a pair of electrodes.
[0003]
Next, the structure will be described.
A substantially spherical light emission in which an F electrode 12 welded with an F molybdenum foil 15 welded with an F lead wire 17, an R electrode 13 welded with an R molybdenum foil 16 welded with an R lead wire 18, and mercury 14 is enclosed. The central axis of the arc tube 10 having the portion 11 at the center is the opening 21 and the bottom 22 of the elliptical reflector 20 with the F electrode 12 on the opening 21 side of the elliptical reflecting mirror 20 and the R electrode 13 on the bottom 22 side. The arc tube 10 is incorporated in the elliptical reflecting mirror 20 so that the center of the light emitting unit 11 coincides with the focal point 25 of the elliptical reflecting mirror 20 so as to coincide with the connecting central axis.
[0004]
Next, the operation will be described.
When a drive voltage is applied to the F lead wire 17 and the R lead wire 18, the mercury 14 is excited by the discharge between the F electrode 12 and the R electrode 13 of the light emitting unit 10 to emit light. The light generated between the F electrode 12 and the R electrode 13 and emitted from the light emitting unit 11 is emitted to the outside from the elliptical reflecting mirror 20 through the following optical path.
[0005]
FIG. 7 is a diagram showing an optical path of the conventional discharge lamp with a reflector shown in FIG.
In FIG. 7, F1 is a focal point inside the elliptical reflector, and F2 is a focal point outside the elliptical reflector. A, B, and C are light emission between the electrodes, and indicate the optical paths of the radiated light having different light emission positions.
[0006]
The optical path A emits light at the focal point F1, is reflected by the elliptical reflecting mirror 20, and travels toward the focal point F2.
The optical path B is light emission between the focal point F1 and the R electrode 13 on the bottom 22 side, and is reflected at the point of the same elliptical reflecting mirror 20 as the optical path A and passes near the focal point F2.
The optical path C is light emission between the focal point F1 and the F electrode 12 on the opening 21 side, is reflected at the same point of the elliptical reflecting mirror 20 as the optical path A, and travels in the direction of a straight line connecting the focal points F1 and F2. Since the arc tube 10 is positioned in the direction of the optical path C after being reflected by the elliptical reflecting mirror, the reflected light reenters the arc tube 10 as shown in FIG.
[0007]
[Problems to be solved by the invention]
In the conventional discharge lamp with a reflecting mirror, light emitted between the focal point 25 and the F electrode 12 and reflected by the elliptical reflecting mirror 20 is incident on the arc tube 10 again. 15 oxidation is accelerated. For this reason, breakage of the arc tube 10 and disconnection of the F molybdenum foil 15 occur, causing a short lamp life.
[0008]
Accordingly, an object of the present invention is to provide a lamp having a structure that extends the life of the lamp by reducing the reflected light that is reflected again by the elliptical reflector and then re-entering the arc tube, preventing the arc tube from being damaged and disconnecting the molybdenum foil. And
[0009]
[Means for Solving the Problems]
A discharge lamp with a reflector according to the present invention includes an arc tube having an approximately spherical light emitting portion at a central portion and an elliptical reflector, and a center axis of the arc tube is connected to an opening and a bottom of the elliptical reflector In the discharge lamp with a reflector arranged so as to coincide with the axis,
The arc tube is characterized in that the center of the light emitting part is arranged on the bottom side with respect to the focal point of the elliptical reflecting mirror.
[0010]
A discharge lamp with a reflector according to the present invention includes an arc tube having an approximately spherical light emitting portion with a pair of electrodes enclosed therein and an elliptical reflector, and the elliptical mirror has a central axis of the arc tube In the discharge lamp with a reflector arranged so as to coincide with the central axis connecting the opening and the bottom of
The pair of electrodes are arranged asymmetrically with respect to the center of the light emitting section, so that the distance from the center of the arc tube and the opening near the opening of the elliptical reflector is close to the distance from the center of the arc tube. Forming an electrode far and near the bottom of the elliptical reflector,
The arc tube is arranged so that the center of the light emitting unit and the elliptical reflector focus coincide with each other.
[0011]
A discharge lamp with a reflector according to the present invention includes an arc tube having an approximately spherical light emitting portion with a pair of electrodes enclosed therein and an elliptical reflector, and the elliptical mirror has a central axis of the arc tube In the discharge lamp with a reflector arranged so as to coincide with the central axis connecting the opening and the bottom of
The pair of electrodes are arranged asymmetrically with respect to the center of the light emitting section, so that the distance from the center of the arc tube and the opening near the opening of the elliptical reflector is close to the distance from the center of the arc tube. Forming an electrode far and near the bottom of the elliptical reflector,
The arc tube is characterized in that the center of the light emitting part is arranged on the bottom side with respect to the focal point of the elliptical reflecting mirror.
[0012]
A manufacturing method of a discharge lamp with a reflector according to the present invention is a method for manufacturing a discharge lamp with a reflection mirror having an arc tube having an approximately spherical light emitting portion in the central portion and an elliptical reflection mirror.
The central axis of the arc tube is aligned with the central axis connecting the opening and bottom of the elliptical reflector,
The arc tube is incorporated in the elliptical reflecting mirror so that the center of the light emitting part is arranged on the bottom side of the focal point of the elliptical reflecting mirror.
[0013]
A method for manufacturing a discharge lamp with a reflector according to the present invention is a method for manufacturing a discharge lamp with a reflection mirror having an arc tube having a substantially spherical light emitting portion enclosing a pair of electrodes inside and an elliptical reflection mirror. ,
The pair of electrodes are arranged asymmetrically with respect to the center of the light emitting unit so that the pair of electrodes is an electrode having a short distance from the center of the light emitting unit and an electrode having a long distance from the center of the light emitting unit. Encapsulate,
Arrange the arc tube so that the electrode near the light emitting portion is close to the opening of the elliptical reflector,
The central axis of the arc tube is aligned with the central axis connecting the opening and bottom of the elliptical reflector,
The arc tube is incorporated into the elliptical reflector so that the center of the light emitting unit and the elliptical reflector focus coincide with each other.
[0014]
The manufacturing method of a discharge lamp with a reflector according to the present invention is a method for manufacturing a discharge lamp with a reflection mirror having a substantially spherical light-emitting portion with a pair of electrodes enclosed in a central portion.
The pair of electrodes are arranged asymmetrically with respect to the center of the light emitting unit so that the pair of electrodes is an electrode having a short distance from the center of the light emitting unit and an electrode having a long distance from the center of the light emitting unit. Encapsulate,
Arrange the arc tube so that the electrode near the light emitting portion is close to the opening of the elliptical reflector,
The central axis of the arc tube is aligned with the central axis connecting the opening and bottom of the elliptical reflector,
The arc tube is incorporated in the elliptical reflecting mirror so that the center of the light emitting part is on the bottom side of the focal point of the elliptical reflecting mirror.
[0015]
A discharge lamp with a reflector according to the present invention includes an arc tube having an approximately spherical light emitting portion with a pair of electrodes enclosed therein and an elliptical reflector, and the elliptical mirror has a central axis of the arc tube In the discharge lamp with a reflector arranged so as to coincide with the central axis connecting the opening and the bottom of
The pair of electrodes are arranged so that the center of the pair of electrodes is biased toward the bottom of the elliptical reflecting mirror with respect to the focal point of the elliptical reflecting mirror.
[0016]
The manufacturing method of a discharge lamp with a reflector according to the present invention is a method for manufacturing a discharge lamp with a reflection mirror having a substantially spherical light-emitting portion with a pair of electrodes enclosed in a central portion.
The central axis of the arc tube is aligned with the central axis connecting the opening and bottom of the elliptical reflector,
The pair of electrodes is incorporated into the elliptical reflector so that the center of the pair of electrodes is biased toward the bottom of the elliptical reflector with respect to the focal point of the elliptical reflector. Features.
[0017]
The arc tube is characterized in that the pair of electrodes are arranged asymmetrically with respect to the center of the light emitting portion.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a schematic cross-sectional view illustrating an example of a discharge lamp with a reflector according to the first embodiment.
The discharge lamp with a reflecting mirror shown in FIG. 1 includes the following elements.
10 is an arc tube, 11 is a light emitting section, 12 is an F electrode, 13 is an R electrode, 14 is mercury, 15 is an F molybdenum foil, 16 is an R molybdenum foil, 17 is an F lead wire, 18 is an R lead wire, and 20 is An elliptical reflecting mirror, 21 is an opening, 22 is a bottom, and 25 is a focal point. The F electrode 12 and the R electrode 13 constitute a pair of electrodes.
[0019]
Next, the structure will be described.
The arc tube 10 encloses an F electrode 12 welded with an F molybdenum foil 15 welded with an F lead wire 17, an R electrode 13 welded with an R molybdenum foil 16 welded with an R lead wire 18, and mercury 14. The substantially spherical light emitting portion 11 is provided at the central portion (central portion).
The elliptical reflecting mirror 20 has a part of a spheroid shape.
The arc tube 10 is arranged with the F electrode 12 on the opening 21 side of the elliptical reflecting mirror 20 and the R electrode 13 on the bottom 22 side.
The central axis of the luminous tube 10 is made to coincide with the central axis connecting the opening 21 and the bottom 22 of the elliptical reflecting mirror 20, and the center of the luminous unit 11 is shifted from the focal point 25 of the elliptical reflecting mirror 20 to the bottom 22 side. 10 is incorporated in the elliptical reflecting mirror 20.
[0020]
Since the basic operation is the same as the operation described in the related art, the description is omitted.
When the center of the arc tube 10 is moved from the focal point 25 of the elliptical reflecting mirror 20 to the bottom 22 side of the structure of the discharge lamp with a reflecting mirror, the pair of electrodes are biased toward the bottom with respect to the focal point 25 of the elliptical reflecting mirror 20. Are arranged asymmetrically. The center of the pair of electrodes (the center point between the F electrode 12 and the R electrode 13) is disposed on the bottom 22 side with respect to the focal point 25 of the elliptical reflecting mirror 20. Thereby, the light emission of the optical path by the side of the opening part 21 of the elliptical reflecting mirror 20 can be reduced. Therefore, the light reflected by the elliptical reflecting mirror 20 and re-entering the arc tube 10 is reduced.
[0021]
As described above, in this embodiment, the central axis of the arc tube 10 having the substantially spherical light emitting portion 11 in which the pair of electrodes 12 and 13 and mercury are enclosed in the center is the opening 21 of the elliptical reflecting mirror 20. In the discharge lamp with a reflecting mirror that is incorporated so as to coincide with the central axis connecting the bottom portion 22 and the bottom portion 22, the center of the light emitting portion 11 is shifted from the focal point of the elliptical reflecting mirror 20 toward the bottom portion 22, and the arc tube 10 is moved to the elliptical reflecting mirror 20. A description has been given of a discharge lamp with a reflecting mirror, which is characterized in that it is built in.
[0022]
Embodiment 2. FIG.
FIG. 2 is a schematic cross-sectional view showing an example of a discharge lamp with a reflector according to the second embodiment.
The configuration of the discharge lamp with a reflecting mirror shown in FIG. 2 is the same as that of FIG.
[0023]
Next, the structure will be described.
The arc tube 10 encloses an F electrode 12 welded with an F molybdenum foil 15 welded with an F lead wire 17, an R electrode 13 welded with an R molybdenum foil 16 welded with an R lead wire 18, and mercury 14. The substantially spherical light emitting portion 11 is provided at the center portion.
The elliptical reflecting mirror 20 has a part of a spheroid shape.
The pair of electrodes (F electrode 12 and R electrode 13) enclosed in the light emitting unit 11 are disposed asymmetrically with respect to the center of the light emitting unit 11. The distance of the F electrode 12 from the center of the light emitting unit 11 is short, the distance of the R electrode 13 is long, and the F electrode 12 is arranged on the opening 21 side of the elliptical reflector 20 and the R electrode 13 is arranged on the bottom 22 side. .
The central axis of the arc tube 10 in which the pair of electrodes is arranged as described above coincides with the central axis connecting the opening 21 and the bottom 22 of the elliptical reflecting mirror 20, and the center of the light emitting unit 11 is the focal point 25 of the elliptical reflecting mirror 20. The structure is integrated with
[0024]
Since the basic operation is the same as the operation described in the related art, the description is omitted.
The structure of the discharge lamp with a reflecting mirror is sealed in the light emitting unit 11 with the distance of the F electrode 12 being short from the center of the light emitting unit 11 and the distance of the R electrode 13 being long, so that the pair of electrodes is the elliptical reflecting mirror 20. It is asymmetrically arranged so as to be biased toward the bottom 22 with respect to the focal point. Thereby, the light emission of the optical path by the side of the opening part 21 of the elliptical reflecting mirror 20 can be reduced.
[0025]
As described above, in this embodiment, the central axis of the arc tube 10 having the substantially spherical light emitting portion 11 in which the pair of electrodes 12 and 13 and mercury are enclosed in the center is the opening 21 of the elliptical reflecting mirror 20. In the discharge lamp with a reflecting mirror, which is assembled so as to match the central axis connecting the bottom portion 22 and the bottom portion 22, the arc tube 10 in which the pair of electrodes 12, 13 are arranged asymmetrically with respect to the center of the light emitting portion 11 has a distance from the center. It is incorporated that the closer electrode is the opening 21 side of the elliptical reflecting mirror 20, the farther electrode from the center is the bottom 22 side of the elliptical reflecting mirror 20, and the center of the light emitting part 11 is aligned with the focal point of the elliptical reflecting mirror. A characteristic discharge lamp with a reflecting mirror has been described.
[0026]
Embodiment 3 FIG.
FIG. 3 is a schematic cross-sectional view showing an example of a discharge lamp with a reflector according to the second embodiment.
The configuration of the reflector-equipped discharge lamp shown in FIG. 3 is the same as that of FIG.
[0027]
Next, the structure will be described.
The arc tube 10 encloses an F electrode 12 welded with an F molybdenum foil 15 welded with an F lead wire 17, an R electrode 13 welded with an R molybdenum foil 16 welded with an R lead wire 18, and mercury 14. The substantially spherical light emitting portion 11 is provided at the center portion.
The elliptical reflecting mirror 20 has a part of a spheroid shape.
The pair of electrodes (F electrode 12 and R electrode 13) enclosed in the light emitting unit 11 are disposed asymmetrically with respect to the center of the light emitting unit 11. The distance of the F electrode 12 from the center of the light emitting unit 11 is short, the distance of the R electrode 13 is long, and the F electrode 12 is arranged on the opening 21 side of the elliptical reflector 20 and the R electrode 13 is arranged on the bottom 22 side. .
The central axis of the arc tube 10 in which the pair of electrodes are arranged as described above is made to coincide with the central axis connecting the opening 21 and the bottom 22 of the elliptical reflecting mirror 20, and the center of the light emitting unit 11 is set to the elliptical reflecting mirror 20. A structure in which the arc tube 10 is incorporated in the elliptical reflecting mirror 20 is shifted from the focal point 25 toward the bottom 22 side.
[0028]
Since the basic operation is the same as the operation described in the related art, the description is omitted.
In the structure of the discharge lamp with a reflecting mirror, the distance from the center of the light emitting portion 11 to the F electrode 12 is short, the distance of the R electrode 13 is long and the light emitting portion 11 is enclosed, and the center is from the focal point 25 of the elliptical reflecting mirror 20. By shifting to the bottom 22 side, the pair of electrodes are arranged asymmetrically so as to be biased toward the bottom 22 with respect to the focal point 25 of the elliptical reflecting mirror 20. Thereby, the light emission of the optical path by the side of the opening part 21 of the elliptical reflecting mirror 20 can be reduced.
[0029]
As described above, in this embodiment, the central axis of the arc tube 10 having the substantially spherical light emitting portion 11 in which the pair of electrodes 12 and 13 and mercury are enclosed in the center is the opening 21 of the elliptical reflecting mirror 20. In the discharge lamp with a reflecting mirror, which is assembled so as to match the central axis connecting the bottom portion 22 and the bottom portion 22, the arc tube 10 in which the pair of electrodes 12, 13 are arranged asymmetrically with respect to the center of the light emitting portion 11 has a distance from the center. The closer electrode is the opening 21 side of the elliptical reflecting mirror 20, the farther electrode from the center is the bottom 22 side of the elliptical reflecting mirror 20, and the center of the light emitting part 11 is closer to the bottom 22 side than the focal point 25 of the elliptical reflecting mirror 20. A description has been given of a discharge lamp with a reflecting mirror, which is characterized by being assembled by shifting.
[0030]
Example 1.
FIG. 4 is a schematic diagram showing the configuration of a lamp for measuring the temperature of the arc tube.
In the experiment, the following discharge lamp with a reflecting mirror was used.
Elliptical mirror long axis: 30 mm
Short axis: 19mm
Elliptical mirror front length (focal point-aperture end): 15mm
Arc tube diameter: 6mm
Light emitting part diameter: 9mm
Front length of arc tube (light emission center to arc tube front end): 25 mm
Arc tube input: 120W
[0031]
In FIG. 4, -shift (minus shift) is a case of shifting by designating a negative value, and the arc tube or the electrode is moved in the direction of the arrow (the bottom side of the elliptical reflector in FIG. 4). Indicates to shift.
Further, + shift (plus shift) is a case of shifting by designating a positive numerical value, and the arc tube or the electrode is shifted in the direction of the arrow (the opening side of the elliptical reflector in FIG. 4). It shows that.
The temperature was measured on the outside of the arc tube as indicated by the temperature measurement points in FIG.
[0032]
FIG. 5 shows the result of measuring the temperature of the arc tube by shifting the arc tube or the electrode using the lamp having the configuration shown in FIG.
FIG. 5 shows an example in which the distance between the pair of electrodes is 1.3 mm.
The horizontal column of the table of FIG. 5 shows the result of changing the numerical value for shifting the arc tube from −0.4 to 0.4. The vertical row shows the result of changing the numerical value for shifting the electrode from −0.4 to 0.4.
The case where the numerical value of the shift is 0 (zero) indicates the same case as the conventional discharge lamp with a reflecting mirror. That is, the numerical value of the shift between the arc tube and the electrode is 0, and the arc tube temperature is 349 ° C.
According to the result of FIG. 5, when either or both of the arc tube and the electrode were shifted to the-side, the arc tube temperature was less than 349 ° C.
[0033]
As the arc tube temperature rises, the arc tube temperature is deteriorated and oxidation of the molybdenum foil progresses to shorten the lifetime. Therefore, the lower the temperature, the better. However, regardless of the temperature of the arc tube, it is necessary to keep the light emitting portion at 800 to 1000 ° C. in order to suppress electrode consumption.
Further, FIG. 5 is a numerical value showing an example of the result of an experiment focusing on the arc tube temperature. The reflected light re-enters the arc tube as the arc tube and electrode are shifted to the bottom side of the elliptical reflector. As a result, the arc tube temperature is lowered.
[0034]
【The invention's effect】
The ellipsoidal reflector has a combination of a shift to the bottom side of the arc tube, a shortening of the distance from the center of the light emitting unit to the opening side electrode, and a combination of a shift of the arc tube and a shortening of the distance from the center of the light emitting unit to the opening side electrode. Since the light emission on the opening side from the focal point is reduced, the light reflected by the elliptical reflector and re-entering the arc tube is reduced, and the lamp can be prevented from being damaged by the heating of the re-incident light and the molybdenum foil being disconnected. The life can be extended.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an example of a discharge lamp with a reflector according to a first embodiment.
FIG. 2 is a schematic cross-sectional view showing an example of a discharge lamp with a reflector according to a second embodiment.
3 is a schematic cross-sectional view showing an example of a discharge lamp with a reflector according to Embodiment 3. FIG.
FIG. 4 is a schematic diagram showing the configuration of a discharge lamp with a reflector that measures the temperature of the arc tube.
FIG. 5 is a diagram showing a measurement result of the arc tube temperature.
FIG. 6 is a schematic cross-sectional view of an example of a conventional discharge lamp with a reflecting mirror.
FIG. 7 is a view showing an optical path of a conventional elliptical reflecting mirror.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Light emission tube, 11 Light emission part, 12 F electrode, 13 R electrode, 14 Mercury, 15 F molybdenum foil, 16 R molybdenum foil, 17 F lead wire, 18 R lead wire, 20 Elliptical mirror, 21 Opening part, 22 Bottom , 25 focus, optical path of A, B, C radiation, F1 elliptical reflector internal focus, F2 elliptical reflector external focus.

Claims (3)

内部に一対の電極と水銀とを封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記発光管は、上記発光部の中心が上記楕円反射鏡の焦点より底部側になるように配置され、
上記一対の電極は、上記発光部の中心に対して対称に配置され、
上記発光部の中心が上記楕円反射鏡の焦点に一致する場合に比べ、上記楕円反射鏡で反射して上記発光管に再入射する光が少なくなることを特徴とする反射鏡付放電ランプ。 An arc tube having a substantially spherical light emitting portion enclosing a pair of electrodes and mercury inside and an elliptical reflecting mirror, and a center connecting the center axis of the arc tube to the opening and bottom of the elliptical reflecting mirror In the discharge lamp with a reflector arranged so as to coincide with the axis,
The light emitting tube, the center of the light emitting portion is disposed such that the bottom side of the focal point of the elliptical reflector,
The pair of electrodes are arranged symmetrically with respect to the center of the light emitting unit,
Compared with the case where the center of the light emitting part coincides with the focal point of the elliptical reflecting mirror, the light reflected by the elliptical reflecting mirror and reentering the arc tube is reduced. 内部に一対の電極と水銀とを封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記一対の電極は、発光部の中心に対して上記楕円反射鏡の底部側に偏るように非対称に配置されることによって、発光管の中心からの距離が近くかつ楕円反射鏡の開口部に近い電極と、発光管の中心からの距離が遠くかつ楕円反射鏡の底部に近い電極とを形成し、
上記発光管は、上記発光部の中心と上記楕円反射鏡焦点とが一致するように配置され、
上記一対の電極が上記発光部の中心に対して対称に配置される場合に比べ、上記楕円反射鏡で反射して上記発光管に再入射する光が少なくなることを特徴とする反射鏡付放電ランプ。 An arc tube having a substantially spherical light emitting portion enclosing a pair of electrodes and mercury inside and an elliptical reflecting mirror, and a center connecting the center axis of the arc tube to the opening and bottom of the elliptical reflecting mirror In the discharge lamp with a reflector arranged so as to coincide with the axis,
The pair of electrodes are arranged asymmetrically so as to be biased toward the bottom of the elliptical reflecting mirror with respect to the center of the light emitting part, so that the distance from the center of the arc tube is close and the opening of the elliptical reflecting mirror is close Forming an electrode and an electrode far from the center of the arc tube and close to the bottom of the elliptical reflector,
The arc tube is arranged so that the center of the light emitting unit and the elliptical reflector focus coincide with each other ,
Compared with the case where the pair of electrodes are arranged symmetrically with respect to the center of the light emitting section, less light is reflected by the elliptical reflector and re-enters the arc tube. lamp. 内部に一対の電極と水銀とを封入した略球状の発光部を中央部分に有する発光管と楕円反射鏡とを備え、上記発光管の中心軸を上記楕円反射鏡の開口部と底部を結ぶ中心軸に一致させて配置した反射鏡付放電ランプにおいて、
上記一対の電極は、発光部の中心に対して上記楕円反射鏡の底部側に偏るように非対称に配置されることによって、発光管の中心からの距離が近くかつ楕円反射鏡の開口部に近い電極と、発光管の中心からの距離が遠くかつ楕円反射鏡の底部に近い電極とを形成し、
上記発光管は、発光部の中心が楕円反射鏡の焦点より底部側になるように配置され、
上記発光部の中心が上記楕円反射鏡の焦点に一致し、上記一対の電極が上記発光部の中心に対して対称に配置される場合に比べ、上記楕円反射鏡で反射して上記発光管に再入射する光が少なくなることを特徴とする反射鏡付放電ランプ。 An arc tube having a substantially spherical light emitting portion enclosing a pair of electrodes and mercury inside and an elliptical reflecting mirror, and a center connecting the center axis of the arc tube to the opening and bottom of the elliptical reflecting mirror In the discharge lamp with a reflector arranged so as to coincide with the axis,
The pair of electrodes are arranged asymmetrically so as to be biased toward the bottom of the elliptical reflecting mirror with respect to the center of the light emitting part, so that the distance from the center of the arc tube is close and the opening of the elliptical reflecting mirror is close Forming an electrode and an electrode far from the center of the arc tube and close to the bottom of the elliptical reflector,
The arc tube is arranged so that the center of the light emitting part is on the bottom side from the focal point of the elliptical reflector,
Compared with the case where the center of the light emitting unit coincides with the focal point of the elliptical reflecting mirror and the pair of electrodes are arranged symmetrically with respect to the center of the light emitting unit, the light reflected by the elliptical reflecting mirror is reflected on the arc tube. A discharge lamp with a reflector, characterized in that the amount of light incident again is reduced.
JP2002139739A 2002-05-15 2002-05-15 Discharge lamp with reflector and method of manufacturing discharge lamp with reflector Expired - Fee Related JP4294262B2 (en)

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