JPH0613029A - Small metal vapor discharge lamp - Google Patents
Small metal vapor discharge lampInfo
- Publication number
- JPH0613029A JPH0613029A JP17038792A JP17038792A JPH0613029A JP H0613029 A JPH0613029 A JP H0613029A JP 17038792 A JP17038792 A JP 17038792A JP 17038792 A JP17038792 A JP 17038792A JP H0613029 A JPH0613029 A JP H0613029A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- diameter
- tip
- small
- discharge lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Discharge Lamp (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、小形メタルハライドラ
ンプのような金属気放電灯に係り、特にその電極構造に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal gas discharge lamp such as a small metal halide lamp, and more particularly to its electrode structure.
【０００２】[0002]
【従来の技術】石英ガラス製の発光管内に、ＮａＩ、Ｓ
ｃＩ3 、ＬｉＩ2 などのような金属ハロゲン化物を封入
したメタルハライドランプは、高効率で、演色性に優れ
ているためその用途が広がっており、特にランプを小形
化することにより車両の前照灯用光源、液晶プロジェク
ター装置の光源等への使用が研究されている。2. Description of the Related Art NaI, S are contained in a quartz glass arc tube.
Metal halide lamps containing metal halides such as cI 3 and LiI 2 are widely used because of their high efficiency and excellent color rendering properties. Is being researched for use as a light source for a display, a light source of a liquid crystal projector device, and the like.
【０００３】しかし、このような光源においては、小形
化ばかりでなく、瞬時に点灯できることが強く要請され
ている。すなわち、一般に金属蒸気放電灯は、電源電圧
が投入された起動時から定格の光束に達するまでに数分
の待ち時間を要する性質があり、この始動立上り時間を
短縮しないと車両の前照灯用光源等に適用は不可能であ
る。However, in such a light source, not only downsizing but also instantaneous lighting is strongly required. That is, in general, a metal vapor discharge lamp has a property that it takes a few minutes to wait for the luminous flux to reach the rated luminous flux when the power supply voltage is turned on. It cannot be applied to light sources.
【０００４】このような瞬時点灯の対策としては、点灯
回路の改善や、金属ハロゲン化物と一緒に封入される希
ガスとしてキセノンを高圧に封入し、始動時に大電流を
流すことによりこの高圧キセノンガスを励起してこれを
発光させ、これにより瞬時に定格またはそれに近い光束
を得るようにする技術等が提案されている。なお、高圧
のキセノンガスを封入した場合、このガスが発光してい
るうちに管壁温度が上昇し、これにより金属ハロゲン化
物の蒸発を促し、最終的にこの金属ハロゲン化物の原子
の発光へ移るものである。As measures against such instantaneous lighting, the high-voltage xenon gas is improved by improving the lighting circuit or encapsulating xenon in a high pressure as a rare gas to be enclosed together with the metal halide and flowing a large current at the time of starting. A technique has been proposed in which a light beam is excited to emit light, thereby instantaneously obtaining a luminous flux at or near the rated value. When high-pressure xenon gas is filled, the temperature of the tube wall rises while the gas is emitting light, which promotes evaporation of the metal halide and finally shifts to the emission of atoms of the metal halide. It is a thing.
【０００５】しかしながら、このようなメタルハライド
ランプにおいては、始動時に大電流が流れるので、細い
電極を用いると電極が過熱され、このため電極物質が蒸
発し、電極の細りを生じて折損したり、蒸発した電極物
質が管壁に付着して早期黒化を発生する等の不具合があ
る。さらに説明すると、ランプの小形化により電極間距
離も短くなり、１０mm以下、具体的には３５Ｗのメタル
ハライドランプの場合、電極間距離が４．５mm程度にな
り、このようなランプは電極も小形化せざるを得ない。
電極形状が最もシンプルなのは、１本の高融点金属ワイ
ヤにより形成した直棒形の電極軸のみからなる電極であ
る。しかしながら、このような直棒形電極軸のみからな
る電極の場合、熱容量が小さいので大電流を流すと電極
が極度に過熱され、電極物質が蒸発して消耗する心配が
ある。また、消灯後には電極先端の温度が急速に低下
し、このため再始動したい場合に電極の温度が低くなっ
ているから、再始動性が良くない欠点がある。However, in such a metal halide lamp, since a large current flows at the time of starting, when a thin electrode is used, the electrode is overheated, which causes the electrode material to evaporate, causing the electrode to become thin and break or evaporate. The electrode material adheres to the wall of the tube and causes blackening at an early stage. To further explain, the distance between the electrodes is shortened due to the downsizing of the lamp, and the distance between the electrodes is 10 mm or less, specifically, in the case of a 35 W metal halide lamp, the distance between the electrodes is about 4.5 mm. I have to do it.
The electrode having the simplest electrode shape is an electrode having only a straight rod-shaped electrode shaft formed by one refractory metal wire. However, in the case of an electrode including only such a straight rod-shaped electrode shaft, since the heat capacity is small, a large current may cause the electrode to be overheated excessively, and the electrode substance may be evaporated and consumed. Further, the temperature of the electrode tip is rapidly decreased after the light is turned off, and therefore, the temperature of the electrode is low when restarting is desired, so that the restartability is not good.
【０００６】これを防止するため、太い径の電極軸を用
いると、熱容量は大きくなるが、この電極軸を通じて発
光管の封止部に熱が逃げやすくなり、電極の温度が熱電
子を放出するに適した温度に上昇し難くなって始動性が
低下し、かつ立ち消えを発生する場合がある。また、電
極が大きいと発光管の端部に封着し難くなる不具合もあ
る。In order to prevent this, if a large diameter electrode shaft is used, the heat capacity becomes large, but heat easily escapes to the sealing portion of the arc tube through this electrode shaft, and the temperature of the electrode emits thermoelectrons. There is a case where it becomes difficult to raise the temperature to an appropriate temperature, the startability deteriorates, and the lamp goes out. Further, if the electrode is large, there is a problem that it is difficult to seal the end portion of the arc tube.
【０００７】このようなことから、従来の電極の最も一
般的な構造は、電極軸と、この電極軸の先端部に電極コ
イルを巻回して構成したタイプである。このような構造
の場合、電極軸の先端部に設けたコイル部により熱容量
を大きくすることができ、電極が過熱されて電極物質が
蒸発するのを防止することができ、しかも電極軸は相対
的に細くすることができるので熱伝導による熱の逃げを
防止することができ、電極先端部の温度を適度に維持す
ることができる利点がある。From the above, the most general structure of the conventional electrode is the type in which the electrode shaft and the electrode coil is wound around the tip of the electrode shaft. In such a structure, the coil portion provided at the tip of the electrode shaft can increase the heat capacity, prevent the electrode from being overheated and evaporating the electrode substance. Since it can be made extremely thin, there is an advantage that heat can be prevented from escaping due to heat conduction and the temperature of the electrode tip can be maintained at an appropriate level.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、このよ
うな電極コイルをもつ電極を小形化した場合、ア−クの
発生点が一点に定まらず、電極コイル部にアークが生じ
ることがあり、この場合はア−クの安定に時間がかか
り、ア−ク揺れなどの不具合が発生する。However, when the electrode having such an electrode coil is miniaturized, the arc generation point is not fixed at one point, and an arc may occur in the electrode coil portion. It takes a long time for the arc to stabilize, which causes problems such as arc sway.
【０００９】本発明はこのような事情にもとづきなされ
たもので、その目的とするところは、瞬時始動を可能に
し、この始動時におけるアークの安定性がよく、しかも
再始動時における光束の立上がりを短時間になし得て瞬
時再始動も可能にする小形金属蒸気放電灯を提供しよう
とするものである。The present invention has been made in view of the above circumstances. An object of the present invention is to enable an instant start, to provide good arc stability at the time of start, and to make the luminous flux rise at the time of restart. An object of the present invention is to provide a small metal vapor discharge lamp that can be made in a short time and can be instantly restarted.
【００１０】[0010]
【課題を解決するための手段】本発明は、電極の形状
を、発光管に封着される根元側に比べて先端側の径を漸
次大きくし、かつこの太い先端面に小径突起部を形成し
たことを特徴とする。SUMMARY OF THE INVENTION According to the present invention, the shape of the electrode is such that the diameter on the tip side is gradually increased as compared with the base side sealed by the arc tube, and a small diameter protrusion is formed on the thick tip surface. It is characterized by having done.
【００１１】[0011]
【作用】本発明によれば、電極先端部の径が大きいから
熱容量が増して大電流が流れても電極の過熱を防止する
ことができ、しかも電極根元部は細いので電極の熱が逃
げ難く、よって大電流による瞬時始動を可能にし、かつ
立ち消えを防止することもできる。また、消灯した時に
温度低下が遅くなるので、短時間に再始動した場合は迅
速に立ち上がることができ瞬時再始動も可能になる。そ
して、先端部に小径突起部を形成したので、この小径突
起部にアークスポットが形成され、よってア−クが安定
する。According to the present invention, since the diameter of the tip of the electrode is large, the heat capacity can be increased and overheating of the electrode can be prevented even when a large current flows. Moreover, since the base of the electrode is thin, the heat of the electrode is hard to escape. Therefore, it is possible to instantly start with a large current and prevent the lamp from disappearing. Further, when the lamp is turned off, the temperature drop slows down, so that if the engine is restarted in a short time, it can start up quickly and can be restarted instantly. Since the small-diameter protrusion is formed at the tip, an arc spot is formed on the small-diameter protrusion, thus stabilizing the arc.
【００１２】[0012]
【実施例】以下本発明について、図１および図２に示す
一実施例にもとづき説明する。図面は小形メタルハライ
ドランプを示し、１は発光管である。発光管１は石英や
硬質ガラスなどにより形成され、両端部に圧潰封止部
２、２が形成されている。これら圧潰封止部２、２には
それぞれモリブデンなどのような難融性金属からなる金
属箔導体３、３が封着されている。金属箔導体３、３に
は、タングステンからなる電極４、４が溶接されてお
り、これら電極４、４の先端は発光管１内で互いに対向
させられている。この場合、電極間距離Ｌは１０mm以下
であり、３５Ｗのランプの場合は電極間距離Ｌが４．５
mm程度に設定される。また、上記金属箔導体３、３には
タングステンにより形成された外部リード線５、５が接
続されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in FIGS. The drawing shows a small metal halide lamp, and 1 is an arc tube. The arc tube 1 is made of quartz, hard glass, or the like, and has crushed seals 2 and 2 formed at both ends. Metal foil conductors 3 made of a refractory metal such as molybdenum are sealed in the crush-sealed portions 2, 2. Electrodes 4 and 4 made of tungsten are welded to the metal foil conductors 3 and 3, and the tips of these electrodes 4 and 4 face each other in the arc tube 1. In this case, the inter-electrode distance L is 10 mm or less, and in the case of a 35 W lamp, the inter-electrode distance L is 4.5.
It is set to about mm. External lead wires 5 and 5 made of tungsten are connected to the metal foil conductors 3 and 3.
【００１３】上記電極４は図２に示す通り、発光管１の
端部に封着される根元４ｂ側に比べて先端４ａ側の径を
漸次大きくしてあり、先端面は球面形状に形成されてい
るとともに、この先端に小径突起部６を一体に突設して
ある。As shown in FIG. 2, the electrode 4 has a diameter gradually increasing on the tip 4a side as compared with the root 4b side sealed at the end of the arc tube 1, and the tip surface is formed into a spherical shape. At the same time, the small-diameter projection 6 is integrally provided at this tip.
【００１４】３５Ｗ形メタルハライドランプの具体的寸
法を説明すれば、発光管１は肉厚２mm、長径９mm、短径
５mmの石英からなる楕円形をなしており、両端部に外径
４mm程度の封止部２、２を備えている。Ｍｏからなる金
属箔導体３、３は、縦２mm、横４mm、厚さ２０μｍとさ
れている。Explaining the specific dimensions of the 35W type metal halide lamp, the arc tube 1 has an elliptical shape made of quartz having a thickness of 2 mm, a major axis of 9 mm and a minor axis of 5 mm, and both ends thereof are sealed with an outer diameter of about 4 mm. The stoppers 2 and 2 are provided. The metal foil conductors 3 made of Mo have a length of 2 mm, a width of 4 mm, and a thickness of 20 μm.
【００１５】電極４はタングステンにて形成され、先端
部４ａの最大径Ｄは１．０mm以下、例えば０．６mmであ
り、根元４ｂの径Ｄ2 は０．３mmとされている。この場
合、Ｄ2 ／Ｄは０．５である。そして、先端部に形成し
た小径突起部６は、径ｄが０．２mm、突出高さを０．３
mmとしてある。この場合、ｄ／Ｄは０．３３である。な
お、発光管１内には、所定量の金属ハロゲン化物、例え
ばＮａＩを１０mgと、ＳｃＩ3 を２mg、および水銀を４
mgならびにキセノンガスが１気圧封入されている。The electrode 4 is made of tungsten, the maximum diameter D of the tip 4a is 1.0 mm or less, for example 0.6 mm, and the diameter D 2 of the root 4b is 0.3 mm. In this case, D 2 / D is 0.5. The small-diameter protrusion 6 formed at the tip has a diameter d of 0.2 mm and a protrusion height of 0.3 mm.
It is as mm. In this case, d / D is 0.33. In the arc tube 1, a predetermined amount of metal halide, for example, NaI (10 mg), ScI 3 (2 mg), and mercury (4 mg) were used.
1 atmosphere of mg and xenon gas are enclosed.
【００１６】このような構成によるメタルハライドラン
プにおいては、電極４の先端部４ａを大きくし、根元部
４ｂを漸次細くしたので、電極先端部４ａの熱容量が大
きくなり、大電流を通しても電極４が過熱されることが
なく、電極物質の蒸発が防止される。よって、大電流を
流して瞬時点灯を可能にし、この場合、電極の細りによ
る電極の短命や、電極物質の管壁付着による黒化などを
防止することができ、長寿命になる。In the metal halide lamp having such a structure, since the tip 4a of the electrode 4 is made large and the root 4b is made gradually thin, the heat capacity of the electrode tip 4a becomes large, and the electrode 4 is overheated even when a large current is applied. And the evaporation of the electrode material is prevented. Therefore, a large current is passed to enable instantaneous lighting, and in this case, it is possible to prevent a short life of the electrode due to the thinning of the electrode, blackening due to adhesion of the electrode substance on the tube wall, and a long life.
【００１７】また電極４の根元部４ｂは小径になってい
るので、発光管封止部２へ熱伝導による熱の逃げを防止
することができ、電極先端部４ａの温度を熱電子を放出
するのに適度な温度に維持することができる。このた
め、ランプ電圧の変動を防止し、立ち消えを防止するこ
とができるとともに、発光効率などのランプ特性が安定
する。特に、ランプを消灯した場合に電極先端部４ａの
温度が急速に低下しないので、瞬時に再点灯する場合に
立上がりが迅速になり、瞬時再点灯も可能になる。 こ
のようなことから、車両の前照灯用光源等の好都合であ
る。Further, since the base portion 4b of the electrode 4 has a small diameter, it is possible to prevent heat from escaping to the arc tube sealing portion 2 due to heat conduction, and the temperature of the electrode tip portion 4a emits thermoelectrons. It can be maintained at an appropriate temperature. Therefore, it is possible to prevent fluctuations in the lamp voltage, prevent extinction, and stabilize lamp characteristics such as luminous efficiency. In particular, when the lamp is turned off, the temperature of the electrode tip portion 4a does not drop rapidly, so that when the lamp is re-lighted instantly, the rise is quick and instantaneous re-lighting is also possible. Because of this, it is convenient for a light source for a vehicle headlight or the like.
【００１８】さらに、電極４の先端に小径突起部６を形
成したから、アークはこの小径突起部６に集中して発生
する。このためア−クが安定し、ア−ク揺れなどの不具
合を防止することができる。しかも、この電極はタング
ステンにより一体成形されるので、部品点数が少なく、
組み付け手間を省ける利点もある。Further, since the small diameter protrusion 6 is formed at the tip of the electrode 4, the arc is concentrated on the small diameter protrusion 6. For this reason, the arc is stable, and it is possible to prevent problems such as the shaking of the arc. Moreover, since this electrode is integrally formed of tungsten, the number of parts is small,
There is also an advantage that the assembly work can be saved.
【００１９】なお、電極先端部４ａの最大径Ｄと小径突
起部６の径ｄの関係は、 ０．２＜ｄ／Ｄ＜０．５ とするのがよい。The relationship between the maximum diameter D of the electrode tip portion 4a and the diameter d of the small diameter protrusion 6 is preferably 0.2 <d / D <0.5.
【００２０】このような条件は本発明者等の実験による
もので、この実験について説明する。タングステンから
なる電極４として、先端部４ａの最大径Ｄが１．００m
m、０．６mmおよび０．４mmのものを作り、それぞれ小
径突起部６の径ｄをmm一定とし、このような電極を備え
たランプを各種類５本づつ製作した。また、従来の直棒
形電極軸のみにより形成された電極について、線径０．
４mmのランプを５本作り、かつ０．２mmの電極軸の先端
に０．２mmの線径の電極コイルを設けたランプも製作し
た。これら各ランプについて、始動性、アークの揺れ具
合、再始動性および先端の変形について調べた。なお、
始動および再始動の場合、１２ｋＶのパルス電圧を印加
した。この測定結果を下記の表１に示す。表中の分数は
５本中に評価項目の発生した本数を示す。Such conditions are based on an experiment by the present inventors, and this experiment will be described. As the electrode 4 made of tungsten, the maximum diameter D of the tip 4a is 1.00 m.
m, 0.6 mm and 0.4 mm were produced, and the diameter d of the small-diameter protrusions 6 was set to a constant value of mm, and five lamps each having such an electrode were manufactured. Further, regarding the electrode formed only by the conventional straight rod-shaped electrode shaft, the wire diameter of 0.
We also made five 4 mm lamps, and also manufactured a lamp with an electrode coil of 0.2 mm wire diameter at the tip of a 0.2 mm electrode shaft. For each of these lamps, the starting property, the swaying condition of the arc, the restarting property, and the deformation of the tip were examined. In addition,
For starting and restarting, a pulse voltage of 12 kV was applied. The measurement results are shown in Table 1 below. The numbers in the table indicate the number of evaluation items among the five.
【００２１】[0021]
【表１】 上記の結果から、電極先端部の太い部分の径Ｄは１．０
mm以下とし、しかも小径突起部の径をｄとした場合、 ０．２＜ｄ／Ｄ＜０．５ を満足すれば、始動性が良く、ア−クが安定し、再始動
性も良好になり、かつ電極の損傷の少ないランプを得る
ことができるようになる。[Table 1] From the above results, the diameter D of the thick part of the electrode tip is 1.0
If the diameter is less than or equal to mm and the diameter of the small diameter protrusion is d, and 0.2 <d / D <0.5 is satisfied, the startability is good, the arc is stable, and the restartability is good. It becomes possible to obtain a lamp with less damage to the electrodes.
【００２２】なお、本発明は上記実施例には制約されな
い。すなわち、図３および図４は本発明の他の実施例を
示す。この実施例は電極構造を図１の場合と同様にして
あるが、封止部２の長さを極めて長く形成してある。こ
の理由を説明すると、この種の小形メタルハライドラン
プは、発光管の内容積が小さい割に封入薬品の量が多
く、放電空間に面する発光管の管壁温度が一様である
と、余剰の封入薬品が管壁内面全域に亘り付着して光を
吸収し、光束を低下させ、効率を低下させる。発光管１
が小形であると温度分布が管壁全域に亘り均等になり易
い。そこで、封止部２を極めて長くすれば封止部２を伝
わって管壁の熱が逃げ、封止部２から放熱される。この
ため、管壁においては封止部２が接続されている部分の
温度、つまり電極の根元の温度が比較的低くなり、余剰
の封入薬品は最冷部の凝集する性質があるから、このよ
うな薬品は電極根元の近傍に集まる。この結果、封入薬
品が管壁内面の全域に亘り付着することがなくなり、光
を吸収が低減され、効率の低下を抑えることができる。The present invention is not limited to the above embodiment. That is, FIGS. 3 and 4 show another embodiment of the present invention. In this embodiment, the electrode structure is similar to that of FIG. 1, but the length of the sealing portion 2 is extremely long. Explaining the reason for this, a small metal halide lamp of this type has a large inner volume of the arc tube but a large amount of the enclosed chemicals, and if the tube wall temperature of the arc tube facing the discharge space is uniform, an excess of The enclosed drug adheres to the entire inner surface of the tube wall to absorb light, reduce the luminous flux, and reduce efficiency. Arc tube 1
Is small, the temperature distribution tends to be uniform over the entire tube wall. Therefore, if the sealing portion 2 is made extremely long, the heat of the pipe wall escapes along the sealing portion 2 and is radiated from the sealing portion 2. Therefore, in the pipe wall, the temperature of the portion to which the sealing portion 2 is connected, that is, the temperature of the base of the electrode becomes relatively low, and the surplus enclosed chemical has a property of coagulating in the coldest portion. Chemicals gather near the base of the electrode. As a result, the enclosed drug is prevented from adhering to the entire inner surface of the tube wall, light absorption is reduced, and a decrease in efficiency can be suppressed.
【００２３】３５Ｗ級小形メタルハライドランプについ
て、球形部の長さｍと、封止部の長さｎの比率に対する
発光効率の関係を調べたところ、図４のような結果を得
た。この実験より、ｎ／ｍの値は２．０〜５．５であれ
ば、発光効率を支障のない７５％以上に保つことができ
るとが確認された。For the 35 W class small metal halide lamp, the relationship between the luminous efficiency and the ratio of the length m of the spherical portion and the length n of the sealing portion was examined, and the results shown in FIG. 4 were obtained. From this experiment, it was confirmed that if the value of n / m is 2.0 to 5.5, the luminous efficiency can be maintained at 75% or more without any hindrance.
【００２４】なお、上記実施例ではメタルハライドラン
プについて説明したが、本発明は高圧ナトリウムランプ
や水銀ランプなどの他の金属蒸気放電灯の電極に適用し
てもよい。また、電極はタングステンにより構成された
ものに限らず、モリブデンやトリウムを含有したタング
ステン（トリタン）であってもよい。Although the metal halide lamp has been described in the above embodiment, the present invention may be applied to electrodes of other metal vapor discharge lamps such as a high pressure sodium lamp and a mercury lamp. Further, the electrodes are not limited to those made of tungsten, and may be tungsten (tritan) containing molybdenum or thorium.
【００２５】[0025]
【発明の効果】以上説明したように本発明によると、電
極先端部の径を大きくしたから熱容量が増して大電流が
流れても電極の過熱を防止することができ、したがって
大電流の供給により瞬時始動を実現することができ、ま
た点灯中に電極の熱が逃げ難いから立ち消えを防止する
ことができ、さらに瞬時再点灯の場合も電極先端の温度
が急激に低下しないので再始動の立上がりが迅速にな
る。また、根元部を細くしたので、封止が容易になる、
さらに先端部に小径突出部を形成したので、ここにアー
クスポットが安定して形成され、アークに揺れ等が防止
され、ランプ特性が安定する。As described above, according to the present invention, since the diameter of the electrode tip portion is increased, the heat capacity can be increased and the electrode can be prevented from being overheated even when a large current flows. Instantaneous start can be realized, and it is possible to prevent extinguishing because the heat of the electrode is difficult to escape during lighting, and even in the case of instantaneous relighting, the temperature of the electrode tip does not drop sharply, so the restarting will not start. Be quick. Also, since the root part is made thinner, sealing becomes easier,
Further, since the small-diameter protruding portion is formed at the tip portion, the arc spot is stably formed there, the swinging of the arc is prevented, and the lamp characteristics are stabilized.
【図１】本発明の一実施例を示すメタルハライドランプ
の発光管の断面図FIG. 1 is a sectional view of an arc tube of a metal halide lamp showing an embodiment of the present invention.
【図２】同実施例の電極の側面図。FIG. 2 is a side view of the electrode according to the embodiment.
【図３】本発明の他の実施例を示すメタルハライドラン
プの発光管の側面図。FIG. 3 is a side view of an arc tube of a metal halide lamp showing another embodiment of the present invention.
【図４】球形部の長さｍと、封止部の長さｎの比率に対
する発光効率の関係を示す特性図。FIG. 4 is a characteristic diagram showing the relationship of the luminous efficiency with respect to the ratio of the length m of the spherical portion and the length n of the sealing portion.
１…発光管、２…封止部、４…電極、４ａ…電極先端
部、４ｂ…電極根元部、６…小径突出部。DESCRIPTION OF SYMBOLS 1 ... Arc tube, 2 ... Sealing part, 4 ... Electrode, 4a ... Electrode tip part, 4b ... Electrode root part, 6 ... Small diameter protrusion part.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 上村 幸三 東京都港区三田一丁目４番28号 東芝ライ テック株式会社内 (72)発明者 貴家 学 東京都港区新橋３丁目３番９号 東芝エ ー・ブイ・イー株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kozo Uemura 1-4-2, Mita, Minato-ku, Tokyo Toshiba Lighting & Technology Co., Ltd. Abu E Co., Ltd.
Claims (3)
電極を封装した小形金属蒸気放電灯において、 上記電極は耐熱性金属からなり、発光管に封着される根
元側に比べて先端側の径を漸次大きくし、かつ先端面に
小径突起部を形成したことを特徴とする小形金属蒸気放
電灯。1. A small metal vapor discharge lamp in which the electrodes are sealed in the arc tube with an interelectrode distance of 10 mm or less, wherein the electrodes are made of a heat-resistant metal, and the electrodes on the tip side of the arc tube are more sealed than on the root side of the arc tube. A small metal vapor discharge lamp characterized in that the diameter is gradually increased and a small diameter protrusion is formed on the tip surface.
０mm以下とし、上記小径突起部の径をｄとした場合、 ０．２＜ｄ／Ｄ＜０．５ としたことを特徴とする請求項１に記載の小形金属蒸気
放電灯。2. The diameter D of the thick portion of the electrode tip is 1.
The small metal vapor discharge lamp according to claim 1, wherein when the diameter of the small-diameter protruding portion is 0 mm or less, and d is 0.2 <d / D <0.5.
のランプはメタルハライドランプとして用いることを特
徴とする請求項１または請求項２に記載の小形金属蒸気
放電灯。3. A small metal vapor discharge lamp according to claim 1, wherein a metal halide is sealed in the arc tube and the lamp is used as a metal halide lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17038792A JPH0613029A (en) | 1992-06-29 | 1992-06-29 | Small metal vapor discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17038792A JPH0613029A (en) | 1992-06-29 | 1992-06-29 | Small metal vapor discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0613029A true JPH0613029A (en) | 1994-01-21 |
Family
ID=15903994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17038792A Pending JPH0613029A (en) | 1992-06-29 | 1992-06-29 | Small metal vapor discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613029A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1150336A2 (en) * | 2000-04-28 | 2001-10-31 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, and manufacturing method, lighting method, and lighting device for the same |
| EP1215699A1 (en) * | 2000-12-16 | 2002-06-19 | Philips Corporate Intellectual Property GmbH | High pressure discharge lamp and method of manufacture |
| EP1286383A2 (en) * | 2001-08-06 | 2003-02-26 | Nec Corporation | High-pressure discharge lamp |
| JP2003257364A (en) * | 2002-03-05 | 2003-09-12 | Ushio Inc | Short arc mercury lamp |
| JP2004303532A (en) * | 2003-03-31 | 2004-10-28 | Ushio Inc | Xenon lamp |
| US7004809B2 (en) | 2001-06-25 | 2006-02-28 | Bing Lin Yang | Illuminant for discharge lamp |
| EP1965253A1 (en) | 2007-02-27 | 2008-09-03 | Ushiodenki Kabushiki Kaisha | Discharge lamp with concave reflector |
| JP2008282666A (en) * | 2007-05-10 | 2008-11-20 | Ushio Inc | High-pressure discharge lamp |
-
1992
- 1992-06-29 JP JP17038792A patent/JPH0613029A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1830389A2 (en) * | 2000-04-28 | 2007-09-05 | Matsushita Electric Industrial Co., Ltd. | Manufacturing method, lighting method and lighting device for a high-pressure discharge lamp |
| EP1150336A2 (en) * | 2000-04-28 | 2001-10-31 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, and manufacturing method, lighting method, and lighting device for the same |
| US6545430B2 (en) | 2000-04-28 | 2003-04-08 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, and manufacturing method, lighting method, and lighting device for the same |
| EP1150336A3 (en) * | 2000-04-28 | 2002-01-02 | Matsushita Electric Industrial Co., Ltd. | High-pressure discharge lamp, and manufacturing method, lighting method, and lighting device for the same |
| EP1830389A3 (en) * | 2000-04-28 | 2007-09-19 | Matsushita Electric Industrial Co., Ltd. | Manufacturing method, lighting method and lighting device for a high-pressure discharge lamp |
| EP1215699A1 (en) * | 2000-12-16 | 2002-06-19 | Philips Corporate Intellectual Property GmbH | High pressure discharge lamp and method of manufacture |
| KR100868172B1 (en) * | 2000-12-16 | 2008-11-12 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | High-pressure gas discharge lamp, and method of manufacturing same |
| US7004809B2 (en) | 2001-06-25 | 2006-02-28 | Bing Lin Yang | Illuminant for discharge lamp |
| EP1286383A2 (en) * | 2001-08-06 | 2003-02-26 | Nec Corporation | High-pressure discharge lamp |
| EP1286383A3 (en) * | 2001-08-06 | 2003-10-22 | Nec Corporation | High-pressure discharge lamp |
| US6737807B2 (en) | 2001-08-06 | 2004-05-18 | Nec Corporation | High-pressure discharge lamp |
| US7137859B2 (en) | 2001-08-06 | 2006-11-21 | Nec Corporation | High-pressure discharge lamp |
| JP2003257364A (en) * | 2002-03-05 | 2003-09-12 | Ushio Inc | Short arc mercury lamp |
| US7098597B2 (en) | 2003-03-31 | 2006-08-29 | Ushiodenki Kabushiki Kaisha | Xenon lamp |
| DE102004014982B4 (en) * | 2003-03-31 | 2016-11-17 | Ushiodenki Kabushiki Kaisha | Demonstration light source or projector with a xenon lamp with a streamlined anode |
| JP2004303532A (en) * | 2003-03-31 | 2004-10-28 | Ushio Inc | Xenon lamp |
| EP1965253A1 (en) | 2007-02-27 | 2008-09-03 | Ushiodenki Kabushiki Kaisha | Discharge lamp with concave reflector |
| US7588352B2 (en) | 2007-02-27 | 2009-09-15 | Ushiodenki Kabushiki Kaisha | Optical apparatus |
| JP2008282666A (en) * | 2007-05-10 | 2008-11-20 | Ushio Inc | High-pressure discharge lamp |
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