JPH04137350A - Metal halide lamp - Google Patents
Metal halide lampInfo
- Publication number
- JPH04137350A JPH04137350A JP25540690A JP25540690A JPH04137350A JP H04137350 A JPH04137350 A JP H04137350A JP 25540690 A JP25540690 A JP 25540690A JP 25540690 A JP25540690 A JP 25540690A JP H04137350 A JPH04137350 A JP H04137350A
- Authority
- JP
- Japan
- Prior art keywords
- earth metal
- lamp
- iodide
- electrode
- electrodes
- 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.)
- Granted
Links
- 229910001507 metal halide Inorganic materials 0.000 title claims description 16
- 150000005309 metal halides Chemical class 0.000 title claims description 16
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 26
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000010937 tungsten Substances 0.000 claims abstract description 25
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 10
- -1 rare-earth metal iodides Chemical class 0.000 claims abstract description 8
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 5
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000010891 electric arc Methods 0.000 claims abstract description 4
- GQKYKPLGNBXERW-UHFFFAOYSA-N 6-fluoro-1h-indazol-5-amine Chemical compound C1=C(F)C(N)=CC2=C1NN=C2 GQKYKPLGNBXERW-UHFFFAOYSA-N 0.000 claims abstract description 3
- DKSXWSAKLYQPQE-UHFFFAOYSA-K neodymium(3+);triiodide Chemical compound I[Nd](I)I DKSXWSAKLYQPQE-UHFFFAOYSA-K 0.000 claims abstract description 3
- HUIHCQPFSRNMNM-UHFFFAOYSA-K scandium(3+);triiodide Chemical compound [Sc+3].[I-].[I-].[I-] HUIHCQPFSRNMNM-UHFFFAOYSA-K 0.000 claims abstract description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010453 quartz Substances 0.000 abstract description 4
- 229910052692 Dysprosium Inorganic materials 0.000 abstract description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052792 caesium Inorganic materials 0.000 abstract description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 abstract description 2
- 150000004694 iodide salts Chemical class 0.000 abstract description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052753 mercury Inorganic materials 0.000 abstract description 2
- 229910052716 thallium Inorganic materials 0.000 abstract description 2
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 239000007772 electrode material Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 description 5
- 229910003452 thorium oxide Inorganic materials 0.000 description 5
- MDMUQRJQFHEVFG-UHFFFAOYSA-J thorium(iv) iodide Chemical compound [I-].[I-].[I-].[I-].[Th+4] MDMUQRJQFHEVFG-UHFFFAOYSA-J 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- CFTHARXEQHJSEH-UHFFFAOYSA-N silicon tetraiodide Chemical compound I[Si](I)(I)I CFTHARXEQHJSEH-UHFFFAOYSA-N 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 150000003376 silicon Chemical class 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910001930 tungsten oxide Inorganic materials 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001511 metal iodide Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- LTSUHJWLSNQKIP-UHFFFAOYSA-J tin(iv) bromide Chemical compound Br[Sn](Br)(Br)Br LTSUHJWLSNQKIP-UHFFFAOYSA-J 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明はメタルハライドランプの改良に関し、特に発光
管の両端に封着した電極の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in metal halide lamps, and more particularly to improvements in electrodes sealed at both ends of an arc tube.
［従来の技術］
一般に、メタルハライドランプは発光管内に封入する金
属ハロゲン化物の種類により種々のランプ特性を有し、
特に、５ｃＩ３−ＮａＩ系ランプは高効率であり、また
、ＤｙＩ、−ＴＩＩ−ＣｓＩ系ランプは演色性に優れ、
効率が高いことが知られている。[Prior Art] Generally, metal halide lamps have various lamp characteristics depending on the type of metal halide sealed in the arc tube.
In particular, the 5cI3-NaI lamp has high efficiency, and the DyI, -TII-CsI lamp has excellent color rendering properties.
It is known to be highly efficient.
又、メタルハライドランプの封入金属の沃化物中、希土
類金属沃化物は比較的活性であり、発光管材料である石
英ガラスと反応し沃化ケイ素を生成することがある。Furthermore, among the metal iodides enclosed in metal halide lamps, rare earth metal iodides are relatively active and may react with quartz glass, which is the material of the arc tube, to produce silicon iodide.
この沃化ケイ素は蒸気圧が高く、発光管の両端に封着し
た電極間の高温アーク中ではケイ素とヨウ素とに解離し
、ケイ素が電極先端部の表面に沈積する。そして、この
ケイ素が電極材料であるタングステン金属と一部合金と
なり、融点を降下させ、電極先端部を変形させて始動特
性や立消特性等のランプ特性を悪化させることがある。This silicon iodide has a high vapor pressure and dissociates into silicon and iodine in the high temperature arc between the electrodes sealed at both ends of the arc tube, and silicon is deposited on the surface of the electrode tip. This silicon partially forms an alloy with tungsten metal, which is the electrode material, lowering the melting point and deforming the tip of the electrode, which may deteriorate lamp characteristics such as starting characteristics and turning-off characteristics.
一方、メタルハライドランプの始動特性を改善するため
に、タングステンに酸化トリウムを微量添加し焼結、加
工した、いわゆるトリエーテッドタングステンが電極材
料として一般的に使用されている。On the other hand, in order to improve the starting characteristics of metal halide lamps, so-called thoriated tungsten, which is produced by adding a small amount of thorium oxide to tungsten and sintering and processing it, is generally used as an electrode material.
しかし、活性な希土類金属沃化物蒸気中では、酸化トリ
ウムと希土類金属あるいは石英と反応して生成した沃化
ケイ素が反応し、酸化トリウムが電極から徐々に消失し
、放電空間中に沃化トリウムとして放電される。However, in the active rare earth metal iodide vapor, thorium oxide reacts with the silicon iodide produced by the reaction with the rare earth metal or quartz, and thorium oxide gradually disappears from the electrode, forming thorium iodide in the discharge space. Discharged.
この沃化トリウムは蒸気圧が高く、ランプ電圧を上昇さ
せる要因となり、立消えの原因となる。This thorium iodide has a high vapor pressure and becomes a factor in increasing the lamp voltage, causing the lamp to turn off.
そこで、電極材料として純タングステンを用いることも
知られているが、電子放射特性が悪く、ランプ点灯中電
極温度が高くなり、タングステンのスパッター等による
黒化が著しく、光束維持率が低下するという問題がある
。Therefore, it is known to use pure tungsten as an electrode material, but it has problems such as poor electron emission characteristics, high electrode temperature during lamp lighting, significant blackening due to tungsten sputtering, and a decrease in luminous flux maintenance. There is.
又、特公昭５１−３４６７４号公報にはメタルハライド
ランプの電極うち少なくとも封入物のハロゲンサイクル
の作用で腐食される部位をタングステンと希土類金属酸
化物の混合焼結体で形成することが開示されているが、
これは電極の比較的低温部分のハロゲンサイクルによる
侵食防止が目的であり、ハロゲン化物としては蒸気圧が
高く、活性度も高い臭化錫などを使用するランプには有
効である。Further, Japanese Patent Publication No. 51-34674 discloses that at least the part of the electrode of a metal halide lamp that is corroded by the action of the halogen cycle of the filler material is formed of a mixed sintered body of tungsten and rare earth metal oxide. but,
The purpose of this is to prevent corrosion of the relatively low-temperature portion of the electrode due to the halogen cycle, and it is effective for lamps that use halides such as tin bromide, which has a high vapor pressure and high activity.
一般に、金属ハロゲン化物として、希土類金属の沃化物
を封入するランプは蒸気圧が低く電極部材への直接の侵
食は見られない。むしろ石英ガラスとの反応により、沃
化ケイ素が発生する可能性があり、このケイ素が電極先
端部に沈着し、タングステンと一部合金化して電極先端
部を溶融変形させる。Generally, lamps containing rare earth metal iodides as metal halides have low vapor pressures and do not cause direct corrosion of electrode members. Rather, silicon iodide may be generated due to the reaction with quartz glass, and this silicon will deposit on the electrode tip, partially alloy with tungsten, and melt and deform the electrode tip.
また、トリエーテッドタングステン電極は酸化トリウム
と反応し、沃化トリウムを発生させてランプ電圧が上昇
しランプの立消えが発生する原因となっている。Further, the thoriated tungsten electrode reacts with thorium oxide to generate thorium iodide, which increases the lamp voltage and causes the lamp to turn off.
さらに、酸化トリウムが消失した電極は、タングステン
の移動が起こり、電極変形がさらに進むこととなり、実
用上大きな問題がある。Furthermore, in the electrode where thorium oxide has disappeared, tungsten will migrate, further deforming the electrode, which poses a serious practical problem.
［発明が解決しようとする課題］
本発明は前記の点に鑑みてなされたもので、発光管両端
の電極の変形に伴うランプ電圧上昇及び光束低下が生じ
ないような電極構造を含む発光管設計を行なうものであ
る。[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and provides an arc tube design that includes an electrode structure that prevents an increase in lamp voltage and a decrease in luminous flux due to deformation of the electrodes at both ends of the arc tube. This is what we do.
［課題を解決するための手段］
本発明は、電極のアーク放電に曝される先端部を希土類
金属酸化物のうち少なくとも一種を０．５〜５重量％含
有したタングステンで形成することを特徴とする。[Means for Solving the Problems] The present invention is characterized in that the tip of the electrode exposed to arc discharge is formed of tungsten containing 0.5 to 5% by weight of at least one kind of rare earth metal oxide. do.
また、前記希土類金属酸化物は酸化セリウムであること
を特徴とする。Further, the rare earth metal oxide is characterized in that it is cerium oxide.
［作用］
前記のように構成することにより、発光管内封入物とし
て活性な希土類金属沃化物を封入してなるメタルハライ
ドランプにおいて、電極の電子放射特性は従来のトリエ
ーテッドタングステン電極とほぼ同程度であり、又黒化
も少なく、更に希土類金属や反応により生成するケイ素
によって侵食されることが少なく、仮に一部侵食されて
も、希土類金属沃化物は沃化トリウムのように蒸気圧が
高くならないため（１／１００〜１／１０００程度）、
ランプ電圧上昇が生じず、立消えの恐れはない。[Function] With the above configuration, in a metal halide lamp in which active rare earth metal iodide is enclosed as a filler in the arc tube, the electron emission characteristics of the electrode are approximately the same as those of a conventional thoriated tungsten electrode. In addition, there is less blackening, and it is less likely to be eroded by rare earth metals or silicon produced by reaction, and even if some of it is eroded, rare earth metal iodides do not have a high vapor pressure like thorium iodide ( (about 1/100 to 1/1000),
There is no rise in lamp voltage and there is no risk of the lamp going out.
特に、酸化セリウム（ＣｅＯｚ）入りタングステン（Ｗ
）は電極先端部温度が２０ｏＯ℃以上の耐熱性を有する
ので、電子放射特性もトリエーテッドタングステン電極
と同程度であり、長時間点灯後、ＣｅＯ□が侵食されて
沃化セリウムが生成しても、その蒸気圧は沃化トリウム
の１／１ｏＯ以下でありランプ特性に影響を与えること
はない。In particular, tungsten (W) containing cerium oxide (CeOz)
) has a heat resistance with an electrode tip temperature of 20oO℃ or higher, so its electron emission characteristics are on the same level as thoriated tungsten electrodes. Its vapor pressure is less than 1/1oO of thorium iodide and does not affect lamp characteristics.
［実施例］ 以下、本発明に係る実施例を図面に基づき説明する。[Example] Embodiments according to the present invention will be described below based on the drawings.
第１図はメタルハライドランプの側面図、第２図は同発
光管の両端に封着される電極の側面図である。FIG. 1 is a side view of a metal halide lamp, and FIG. 2 is a side view of electrodes sealed at both ends of the arc tube.
図中１は石英製の発光管であり、発光管両端には一対の
電極２ａ、２ｂが封着され内部には希ガス、水銀及びジ
スプロシウム、タリウム、セシウムの沃化物が封入され
、発光管の端部外壁には保温膜３，３が塗布されている
。In the figure, 1 is a quartz arc tube. A pair of electrodes 2a and 2b are sealed at both ends of the arc tube, and a rare gas, mercury, and iodides of dysprosium, thallium, and cesium are sealed inside. Heat insulating films 3, 3 are applied to the outer walls of the ends.
このような発光管は一端に口金４を有する外球５内に発
光管支柱６ａ、６ｂを介して機械的かつ電気的に支持さ
れている。そして、発光管１の外周には透光性の石英ス
リーブ７が支持部材８ａ、８ｂを介して保持されている
。Such an arc tube is mechanically and electrically supported within an outer sphere 5 having a cap 4 at one end via arc tube supports 6a, 6b. A transparent quartz sleeve 7 is held on the outer periphery of the arc tube 1 via support members 8a and 8b.
又、電極２ａ、２ｂはタングステンに酸化セリウムを重
量比で１％混合し、焼結した電極芯捧２１の先端部にタ
ングステンコイル２２．２３を巻回したものである。更
に、前記タングステン（二重構造）の空隙には電子放射
物質が充填されている。Further, the electrodes 2a and 2b are made of a mixture of tungsten and cerium oxide at a weight ratio of 1%, and a tungsten coil 22, 23 is wound around the tip of a sintered electrode core 21. Furthermore, the voids of the tungsten (double structure) are filled with an electron emitting material.
そして、このようなランプは管入力１５０Ｗの高演色性
形ランプとして使用される。Such a lamp is used as a high color rendering lamp with a tube input of 150W.
次に９本発明に係るランプと従来ランプの諸特性につい
て、実験結果について説明する。Next, experimental results regarding various characteristics of the lamp according to the present invention and the conventional lamp will be explained.
電極として、（１）１％Ｃｅ０２−Ｗ電極、（２）２％
Ｔｈ○２−Ｗ電極、（３）１００％Ｗ電極を封着した発
光管よりなるランプを試作し、その寿命試験を行なった
。As electrodes, (1) 1% Ce02-W electrode, (2) 2%
A lamp consisting of an arc tube sealed with a Th○2-W electrode and (3) a 100% W electrode was manufactured as a prototype, and its lifespan test was conducted.
第３図は点灯時間経過に伴うランプ電圧の変化を示す図
であり、第４図は同じく光束維持率の変化を示す図であ
る。FIG. 3 is a diagram showing changes in lamp voltage as the lighting time elapses, and FIG. 4 is a diagram similarly showing changes in luminous flux maintenance factor.
第３図から明らかなように、ランプ電圧の変化は２％Ｔ
ｈＯ，−Ｗ電極が点灯初期よりその上昇が著しく、３０
００時間点灯後に立消えが発生した。一方、１００％Ｗ
電極および１％Ｃｅ０２−Ｗ電極共にランプ電圧は緩や
かに上昇しているが、６０００時間経過後も立消えが生
じることはない。As is clear from Figure 3, the change in lamp voltage is 2%T.
The rise in the hO, -W electrode was remarkable from the initial stage of lighting, and at 30
After 00 hours of lighting, a flashing occurred. On the other hand, 100%W
Although the lamp voltages of both the electrode and the 1% Ce02-W electrode rose slowly, no fading occurred even after 6000 hours had elapsed.
又、第４図から明らかなように、光束維持率については
１００％Ｗ電極は６０００時間点灯後５０％以下となり
実用的でない。又、２％Ｔｈ○２−Ｗ電極は３０００時
間経過後８０％以上であったが、３８００時間後に立消
えが生じた。Further, as is clear from FIG. 4, the luminous flux maintenance rate of the 100% W electrode is less than 50% after 6000 hours of lighting, which is not practical. In addition, the 2% Th○2-W electrode showed 80% or more after 3000 hours, but faded out after 3800 hours.
このように、本発明に係るＣｅＯ□−Ｗｔ極は従来の電
極に比べてランプ電圧の変化が少なくかつ光束維持率の
低下も少なくそのランプ特性が優れている。As described above, the CeO□-Wt electrode according to the present invention has excellent lamp characteristics with less change in lamp voltage and less decrease in luminous flux maintenance factor than conventional electrodes.
次に、タングステンに対するセリウム等の希土類金属酸
化物の含有量について説明する。Next, the content of rare earth metal oxides such as cerium with respect to tungsten will be explained.
電極材料の基材であるタングステンに対する希土類金属
酸化物の含有量は、重量比で０．５〜５％の範囲が望ま
しく、０．５％未満では電子放射特性が不十分となりラ
ンプの始動特性が悪化し、また、５％を越えるとタング
ステンの加工性が悪くなり線材に加工しにくくなる。The content of rare earth metal oxide relative to tungsten, which is the base material of the electrode material, is preferably in the range of 0.5 to 5% by weight; if it is less than 0.5%, the electron emission characteristics will be insufficient and the starting characteristics of the lamp will deteriorate. Moreover, if it exceeds 5%, the processability of tungsten deteriorates and it becomes difficult to process it into a wire rod.
なお、電子放射特性や加工性を考慮した場合、１重量％
前後が最良である。In addition, when considering electron emission characteristics and processability, 1% by weight
Before and after is best.
又、本発明に係る電極は希土類金属酸化物とタングステ
ンとを焼結して形成するので、従来のタングステン電極
に酸化物を塗布して形成するものに比べて、ランプ点灯
中の酸化物の消耗が少なく、ランプ特性への影響がほと
んどない。In addition, since the electrode according to the present invention is formed by sintering rare earth metal oxide and tungsten, the oxide is consumed less during lamp lighting compared to the conventional tungsten electrode formed by coating an oxide. There is little effect on lamp characteristics.
また電子放射特性の違いがなく、始動特性に差がない。Furthermore, there is no difference in electron emission characteristics, and there is no difference in starting characteristics.
更に、点灯中高温となる電極先端部の内部組織（結晶の
ならびや希土類酸化物の分布）の変化が少ないので、電
流が大きく管入力が大きなランプにも適する。Furthermore, since there is little change in the internal structure (crystal alignment and distribution of rare earth oxides) at the tip of the electrode, which becomes hot during lighting, it is suitable for lamps with large currents and large tube inputs.
なお、前記実施例では希土類金属酸化物としてセリウム
について説明したが、他の酸化物、例えばランタン、ジ
スプロシウム、イツトリウムについてもセリウムとほぼ
同様な効果が認められた。Although cerium was explained as the rare earth metal oxide in the above example, effects similar to those of cerium were also observed with other oxides such as lanthanum, dysprosium, and yttrium.
又、封入物として少なくとも沃化ジスプロシウムを封入
したランプについて説明したが、少なくとも沃化スカン
ジウムを封入したランプは、安定した光束動程特性を示
し、又ランプ電圧の変化が少ない等の優れた特性を有し
、さらに、少なくとも沃化ネオジウムを封入したランプ
は、前記スカンジウムランプに加えて色温度の変化が少
ない等の優れた特性を有する。In addition, although a lamp containing at least dysprosium iodide as the filler was described, a lamp containing at least scandium iodide exhibits stable luminous flux characteristics and has excellent characteristics such as little change in lamp voltage. Furthermore, lamps containing at least neodymium iodide have excellent characteristics, such as little change in color temperature, in addition to the scandium lamps described above.
［発明の効果］
以上の説明から明らかなように、本発明に係るメタルハ
ライドランプは、電極材料として所定の範囲内の希土類
金属酸化物のタングステンとの混合焼結体を用いたので
、ランプ寿命期間中のランプ電圧上昇に伴うランプの立
消え及び電極よりの電子放射物質の飛散に伴うランプ黒
化による光束維持率の低下を防止することができ、長寿
命のランプを得ることができる。[Effects of the Invention] As is clear from the above description, the metal halide lamp according to the present invention uses a mixed sintered body of rare earth metal oxide and tungsten within a predetermined range as the electrode material, so that the lamp life is It is possible to prevent the lamp from turning off due to an increase in the lamp voltage inside the lamp and from decreasing the luminous flux maintenance rate due to lamp blackening due to the scattering of electron-emitting substances from the electrodes, thereby making it possible to obtain a lamp with a long life.
第１図は本発明に係るメタルハライドランプの一実施例
を示す側面図、第２図は同じく電極の一実施例を示す側
面図であり、第３図は点灯時間経過に伴うランプ電圧の
変化を示す特性図であり、第４図は点灯時間経過に伴う
光束維持率の変化を示す特性図である。Fig. 1 is a side view showing an embodiment of the metal halide lamp according to the present invention, Fig. 2 is a side view showing an embodiment of the electrode, and Fig. 3 shows the change in lamp voltage as the lighting time elapses. FIG. 4 is a characteristic diagram showing changes in luminous flux maintenance factor as the lighting time elapses.
Claims (3)
とも希土類金属の沃化物を封入したメタルハライドラン
プにおいて、 前記電極のうちアーク放電に曝される先端部は、希土類
金属酸化物の少なくとも１種を０．５〜５重量％含有し
たタングステンで形成することを特徴とするメタルハラ
イドランプ。(1) In a metal halide lamp in which at least a rare earth metal iodide is sealed in an arc tube with a pair of electrodes sealed at both ends, the tip of the electrode exposed to arc discharge is at least one rare earth metal oxide. A metal halide lamp characterized in that it is made of tungsten containing 0.5 to 5% by weight of one kind.
求項第１項記載のメタルハライドランプ。(2) The metal halide lamp according to claim 1, wherein the rare earth metal oxide comprises cerium oxide.
ロシウム、沃化ネオジウムの少なくとも１種を封入して
なる請求項第１項または第２項記載のメタルハライドラ
ンプ。(3) The metal halide lamp according to claim 1 or 2, wherein the rare earth metal includes at least one of scandium iodide, dysprosium iodide, and neodymium iodide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25540690A JPH0731999B2 (en) | 1990-09-27 | 1990-09-27 | Metal halide lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25540690A JPH0731999B2 (en) | 1990-09-27 | 1990-09-27 | Metal halide lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04137350A true JPH04137350A (en) | 1992-05-12 |
| JPH0731999B2 JPH0731999B2 (en) | 1995-04-10 |
Family
ID=17278325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25540690A Expired - Fee Related JPH0731999B2 (en) | 1990-09-27 | 1990-09-27 | Metal halide lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0731999B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5590392A (en) * | 1994-02-24 | 1996-12-31 | Kabushiki Kaisha Toshiba | Corrosion-resistant material for contact with high temperature molten metal and method for production thereof |
| EP2105946A3 (en) * | 2008-03-26 | 2012-02-08 | Harison Toshiba Lighting Corporation | High-pressure discharge lamp |
-
1990
- 1990-09-27 JP JP25540690A patent/JPH0731999B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5590392A (en) * | 1994-02-24 | 1996-12-31 | Kabushiki Kaisha Toshiba | Corrosion-resistant material for contact with high temperature molten metal and method for production thereof |
| EP2105946A3 (en) * | 2008-03-26 | 2012-02-08 | Harison Toshiba Lighting Corporation | High-pressure discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0731999B2 (en) | 1995-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2004172056A (en) | Mercury-free arc tube for discharge lamp device | |
| JPS63248050A (en) | Rare gas discharge lamp | |
| JPH09118540A (en) | Low-sodium-permeability glass and lamp | |
| JPWO2002082500A1 (en) | Metal halide lamps for automotive headlights | |
| JP2010153339A (en) | High-pressure discharge lamp | |
| EP1755145A2 (en) | Metal halide lamp with a ceramic discharge vessel | |
| JP3701222B2 (en) | High pressure discharge lamp and high pressure discharge lamp system using the same | |
| US7573203B2 (en) | Mercury-free high-pressure discharge lamp and luminaire using the same | |
| JP2000504482A (en) | Low pressure discharge lamp | |
| JP2947958B2 (en) | High pressure discharge lamp | |
| JP2007115652A (en) | High-pressure discharge lamp and lighting device | |
| JPH04137350A (en) | Metal halide lamp | |
| JP2002538583A (en) | Low pressure mercury vapor discharge lamp | |
| JP3925249B2 (en) | Metal halide lamp | |
| JPH0721981A (en) | Metal halide lamp | |
| JP3221228B2 (en) | High pressure discharge lamp | |
| EP0757778B1 (en) | Sodium halide discharge lamp | |
| JP3480340B2 (en) | DC discharge lamp | |
| JP3174221B2 (en) | Metal halide lamp | |
| JP3233355B2 (en) | Metal halide lamp | |
| JPS61220265A (en) | Metallic vapor discharge lamp | |
| JPH0582086A (en) | Metal halide lamp | |
| JP3430972B2 (en) | Metal halide lamp | |
| JPH0584631B2 (en) | ||
| US2966606A (en) | Fluorescent lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080410 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090410 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090410 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100410 Year of fee payment: 15 |
|
| LAPS | Cancellation because of no payment of annual fees |