JPH07130331A - Metal halide lamp - Google Patents
Metal halide lampInfo
- Publication number
- JPH07130331A JPH07130331A JP27199093A JP27199093A JPH07130331A JP H07130331 A JPH07130331 A JP H07130331A JP 27199093 A JP27199093 A JP 27199093A JP 27199093 A JP27199093 A JP 27199093A JP H07130331 A JPH07130331 A JP H07130331A
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- Prior art keywords
- lamp
- metal halide
- arc tube
- halide
- color temperature
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はメタルハライドランプに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal halide lamp.
【０００２】[0002]
【従来の技術】従来、高演色で、低色温度のメタルハラ
イドランプとしては、Sn系のハロゲン化物を用いたもの
が知られている。また、他に、高演色メタルハライドラ
ンプとしては、希土類系金属ハロゲン化物を用いたもの
が知られているが、これは比較的相関色温度が高く、し
たがって2800〜3700Kの低色温度を実現できなかった。2. Description of the Related Art Conventionally, as a metal halide lamp having a high color rendering property and a low color temperature, one using a Sn-based halide is known. In addition, as a high color rendering metal halide lamp, one using a rare earth metal halide is known, but this has a relatively high correlated color temperature, and therefore a low color temperature of 2800 to 3700K cannot be realized. It was
【０００３】[0003]
【発明が解決しようとする課題】従来のSn系のハロゲン
化物を用いたメタルハライドランプでは電極の低温部で
タングステンの侵食が大きく電極が折れやすいという問
題点があった。また、高演色を実現するためには、発光
管に封入したハロゲン化物の蒸気圧を十分に高めなけれ
ばならないが、そのためには、発光管の管壁負荷(W/c
m2)を高めなければならない。しかし、管壁負荷を高め
過ぎると、発光管に膨れなどを起こし、これが原因で寿
命特性が悪化するという問題点があった。The conventional metal halide lamp using a Sn-based halide has a problem that the electrode is apt to break due to the erosion of tungsten at a low temperature portion of the electrode. Also, in order to achieve high color rendering, the vapor pressure of the halide enclosed in the arc tube must be raised sufficiently, but for that purpose, the wall load of the arc tube (W / c
m 2 ) must be increased. However, when the load on the tube wall is increased too much, the arc tube swells, which causes a problem that life characteristics are deteriorated.
【０００４】一方、ランタノイド系金属ハロゲン化物を
用いた従来の高演色メタルハライドランプは、分光分布
において短波長側の発光の割合が大きく、相関色温度が
高い。相関色温度を下げるために、管壁負荷を上げて発
光管内の金属ハロゲン化物の蒸気圧を上げると、反応性
の高いランタノイド系金属ハロゲン化物が発光管管壁と
反応し、寿命特性が悪化するという問題点があった。On the other hand, the conventional high color rendering metal halide lamp using the lanthanoid metal halide has a large proportion of light emission on the short wavelength side in the spectral distribution and a high correlated color temperature. When the vapor pressure of the metal halide in the arc tube is increased in order to lower the correlated color temperature and the vapor pressure of the metal halide in the arc tube is increased, the highly reactive lanthanoid metal halide reacts with the arc tube wall and the life characteristics deteriorate. There was a problem.
【０００５】本発明は、このような問題を解決するため
になされたもので、寿命特性に優れ、かつ相関色温度28
00〜3700Kを実現できる高演色メタルハライドランプを
提供するものである。The present invention has been made in order to solve such a problem and has excellent life characteristics and a correlated color temperature of 28.
It provides high color rendering metal halide lamps that can achieve 00-3700K.
【０００６】[0006]
【課題を解決するための手段】本発明のメタルハライド
ランプは、両端に電極を有し、かつ内部にヨウ化ディス
プロシウム(DyI3)、ヨウ化ツリウム(TmI3)およびヨウ化
ホルミウム(HoI3)のうち少なくとも１種を含むランタノ
イド系金属ハロゲン化物と封入ハロゲン化物総量に対し
40〜60重量％のヨウ化ナトリウム(NaI）と封入ハロゲン
化物総量に対し6〜10重量％のヨウ化タリウム(TlI)と緩
衝ガスとが封入された発光管と、前記発光管を内蔵した
外管とを具備し、前記発光管の全内表面積に対するラン
プ電力である管壁負荷が20〜26W/cm2であり、ランプ電
力が30〜40Wでかつ相関色温度が2800〜3700Kである構成
を有する。Metal halide lamps of the problem-solving means for the present invention has electrodes on both ends, and the internal iodide dysprosium (DyI 3), iodide thulium (TmI 3) and iodide holmium (HoI 3 ), The lanthanoid metal halide containing at least one of
An arc tube in which 40 to 60 wt% sodium iodide (NaI), 6 to 10 wt% thallium iodide (TlI) with respect to the total amount of the enclosed halide, and a buffer gas are enclosed, and an external tube containing the arc tube. A tube wall load, which is the lamp power with respect to the total inner surface area of the arc tube, is 20 to 26 W / cm 2 , the lamp power is 30 to 40 W, and the correlated color temperature is 2800 to 3700 K. Have.
【０００７】[0007]
【作用】この構成により、封入ハロゲン化物総量のほぼ
1/2をNaIが占めることから、NaIの蒸気圧が高くなり、N
aの589nm近辺の輝線スペクトルと長波長側に広がる分子
発光のスペクトルとの放射が大きくなり、低色温度が実
現できる。NaIの封入比率を40重量％以上にすること
で、相関色温度を3700K以下にすることができる。ま
た、NaIの封入比率を60重量％以下にすることで、請求
項１に示すランプ電力と発光管の全内表面積に対するラ
ンプ電力である管壁負荷の下限値においても平均演色評
価数Ｒａを80以上にすることができる。このとき、ラン
タノイド系金属ハロゲン化物は、Naからの放射に不足し
ている短波長側の放射を補う。また、TlIは、535nm近辺
の輝線スペクトルにより、光色を黒体放射軌跡に近づけ
るための最適化と、高効率を実現するためのものであ
る。元来、ランプ光色としては、色度座標図上で黒体放
射上の光色が好まれる。TlIの封入比率が10重量％を超
えると、ｙ座標が大きくなり、緑っぽい光色になる。一
方、TlIの封入比率を6重量％未満にすると、ｙ座標が小
さくなり、ピンクっぽい光色になる。また、TlIの輝線
スペクトルである535nm近辺の波長は、比視感度のピー
ク値に近く、TlIを封入することは高効率を維持するた
めの重要な要因になっている。つまり、TlIの封入比率
を6〜10重量％にすることで、黒体放射に近い光色を実
現でき、高効率を維持できる。[Operation] With this configuration, the total amount of enclosed halides is almost
Since NaI occupies 1/2, the vapor pressure of NaI increases and N
The emission of the emission line spectrum of a near 589 nm and the spectrum of the molecular emission extending to the long wavelength side becomes large, and a low color temperature can be realized. When the NaI encapsulation ratio is 40% by weight or more, the correlated color temperature can be 3700K or less. Further, by setting the NaI encapsulation ratio to 60% by weight or less, the average color rendering index Ra is 80 even at the lower limit value of the lamp power and the tube wall load which is the lamp power with respect to the total inner surface area of the arc tube. The above can be done. At this time, the lanthanoid metal halide supplements the radiation on the short wavelength side, which is insufficient for the radiation from Na. In addition, TlI is for optimizing the light color to be close to the blackbody radiation locus and realizing high efficiency by the emission line spectrum around 535 nm. Originally, as the lamp light color, the light color on the black body radiation on the chromaticity coordinate diagram is preferred. If the encapsulation ratio of TlI exceeds 10% by weight, the y-coordinate becomes large and the color becomes greenish. On the other hand, when the encapsulation ratio of TlI is less than 6% by weight, the y coordinate becomes small and the color becomes pinkish. Further, the wavelength near 535 nm, which is the emission line spectrum of TlI, is close to the peak value of the relative luminous efficiency, and inclusion of TlI is an important factor for maintaining high efficiency. In other words, by setting the encapsulation ratio of TlI to 6 to 10% by weight, it is possible to realize a light color close to that of black body radiation and maintain high efficiency.
【０００８】また、管壁負荷を20W/cm2以上にすること
で、封入金属蒸気圧を十分に上げることができるので、
平均演色評価数Ｒａを80以上にすることができる。一
方、管壁負荷を26W/cm2以下にすることで、定格寿命600
0時間での光束維持率を70％以上にすることができる。
このとき、ランタノイド系金属ハロゲン化物の封入比率
は従来に比べ少ないので、発光管管壁との反応が抑制さ
れ、良好な寿命特性が得られる。[0008] Further, by setting the tube wall load to 20 W / cm 2 or more, the enclosed metal vapor pressure can be sufficiently increased,
The average color rendering index Ra can be 80 or more. On the other hand, if the wall load is 26 W / cm 2 or less, the rated life is 600
The luminous flux maintenance factor at 0 hours can be 70% or more.
At this time, since the encapsulation ratio of the lanthanoid-based metal halide is smaller than in the conventional case, the reaction with the arc tube wall is suppressed, and good life characteristics are obtained.
【０００９】[0009]
【実施例】図１に示すように、本発明実施例のランプ電
力が35Wであるメタルハライドランプは、石英製の発光
管１が外管２内に設けられており、外管２内には窒素ガ
スが50000パスカル封入されている。発光管１は内径6mm
で、両端に電極（図示せず）を有し、かつ内部に緩衝ガ
スとしてアルゴンが10000パスカル、DyI3,TlI,NaIの組
成比が37：8：55であるハロゲン化物が3.0mg、および水
銀が13mg封入されている。発光管１の両端外面には、Zr
O2等からなる熱反射膜３が形成されており、発光管１
は、透光性筒４に囲繞されている。透光性筒４の両端開
口部は金属板５で塞がれている。発光管１および透光性
筒４はステム線６で外管２内に保持されている。なお、
図１において、７はZr-Alゲッター、８は口金を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a metal halide lamp according to an embodiment of the present invention having a lamp power of 35 W is provided with a quartz arc tube 1 inside an outer tube 2 and nitrogen inside the outer tube 2. Gas is enclosed in 50,000 pascals. Arc tube 1 has an inner diameter of 6 mm
In addition, it has electrodes (not shown) at both ends, and has 10000 pascals of argon as a buffer gas, 3.0 mg of a halide having a composition ratio of DyI 3 , TlI, and NaI of 37: 8: 55, and mercury. Is included in 13 mg. Zr is attached to the outer surface of both ends of the arc tube 1.
A heat reflection film 3 made of O 2 or the like is formed, and the arc tube 1
Are surrounded by the transparent tube 4. The openings at both ends of the translucent cylinder 4 are closed with metal plates 5. The arc tube 1 and the transparent tube 4 are held in the outer tube 2 by a stem wire 6. In addition,
In FIG. 1, 7 is a Zr-Al getter and 8 is a die.
【００１０】上記35Wのメタルハライドランプ（本発明
実施例）を垂直点灯したときのランプ電圧、色温度初期
特性、平均演色評価数Ｒａおよび光束維持率特性を、従
来のものと比較して表１に示す。Table 1 shows the lamp voltage, color temperature initial characteristics, average color rendering index Ra and luminous flux maintenance factor characteristics when the above 35 W metal halide lamp (Example of the present invention) was vertically lit, in comparison with the conventional one. Show.
【００１１】[0011]
【表１】 [Table 1]
【００１２】従来のSn系ランプでは、５本中２本が寿命
中に電極折れが発生し、また、従来のランタノイド系ラ
ンプは色温度が4300Kであり、本発明の目的とする色温
度が得られなかった。これに対し、本発明のランプは、
低色温度でかつ高演色であり、寿命特性も優れたもので
あることが確認できた。In the conventional Sn-based lamp, electrode breakage occurs in 2 out of 5 lamps during the life of the lamp, and in the conventional lanthanoid-based lamp, the color temperature is 4300K, and the target color temperature of the present invention is obtained. I couldn't do it. On the other hand, the lamp of the present invention is
It was confirmed that the color temperature was low, the color rendering was high, and the life characteristics were excellent.
【００１３】次に、本発明の実施例である30Wメタルハ
ライドランプの発光管の全内表面積に対するランプ電力
である管壁負荷と平均演色評価数Ｒａとの関係、およ
び、40Wメタルハライドランプの管壁負荷と定格寿命600
0時間での光束維持率との関係を図２に示す。電源電圧
の変動を考慮して、30W,35Wおよび40Wのランプについ
て、検討を行った。Next, the relationship between the tube wall load which is the lamp power and the average color rendering index Ra with respect to the total inner surface area of the arc tube of the 30 W metal halide lamp which is an embodiment of the present invention, and the tube wall load of the 40 W metal halide lamp. And rated life 600
The relationship with the luminous flux maintenance factor at 0 hours is shown in FIG. The lamps of 30W, 35W and 40W were examined in consideration of the fluctuation of the power supply voltage.
【００１４】なお、図２の直線Ａは30Wのメタルハライ
ドランプのＲａを、直線Ｂは40Wのメタルハライドラン
プの光束維持率をそれぞれ示す。A straight line A in FIG. 2 shows Ra of a 30 W metal halide lamp, and a straight line B shows a luminous flux maintenance factor of a 40 W metal halide lamp.
【００１５】図２からも明らかなように、管壁負荷を20
W/cm2以上にすると、ランプ電力30Wのランプにおいて
も、平均演色評価数Ｒａが80以上になる。ランプ電力が
30W以上のランプについては、発光管内の金属蒸気圧が3
0Wのランプより高くなるので、さらに高演色が実現でき
る。つまり、管壁負荷を20W/cm2以上にすることで、ラ
ンプ電力が30〜40Wのランプにおいて、平均演色評価数
Ｒａを80以上にすることができる。また、管壁負荷を26
W/cm2以下にすると、ランプ電力40Wのランプにおいて
も、定格寿命6000時間で光束維持率70％以上になる。ラ
ンプ電力40W以下のランプについては、40Wのランプより
光束維持率特性が良好である。つまり、管壁負荷を26W/
cm2以下にすることで、ランプ電力が30〜40Wのランプに
おいて、定格寿命6000時間で光束維持率70％以上にする
ことができる。このように、本発明ランプは、平均演色
評価数Ｒａが良好で、かつ優れた寿命特性を有する。As is clear from FIG. 2, the pipe wall load is 20
When W / cm 2 or more, the average color rendering index Ra becomes 80 or more even in a lamp with a lamp power of 30 W. Lamp power
For lamps of 30 W or more, the metal vapor pressure in the arc tube is 3
Since it is higher than the 0W lamp, higher color rendering can be achieved. That is, by setting the tube wall load to 20 W / cm 2 or more, the average color rendering index Ra can be set to 80 or more in a lamp having a lamp power of 30 to 40 W. In addition, the pipe wall load is 26
When it is set to W / cm 2 or less, the luminous flux maintenance factor becomes 70% or more at the rated life of 6000 hours even in the case of the lamp having the lamp power of 40W. For a lamp with a lamp power of 40 W or less, the luminous flux maintenance factor characteristic is better than that of a 40 W lamp. In other words, the wall load is 26W /
When the lamp power is 30 to 40 W, the luminous flux maintenance factor can be 70% or more at the rated life of 6000 hours by setting the cm 2 or less. As described above, the lamp of the present invention has a good average color rendering index Ra and has excellent life characteristics.
【００１６】図３に本発明実施例の35Wメタルハライド
ランプのNaIの封入比率と平均演色評価数Ｒａおよび相
関色温度Ｔｃとの各関係を示す。このときのTlIの封入
比率は、8重量％一定である。FIG. 3 shows the relationship between the encapsulation ratio of NaI, the average color rendering index Ra and the correlated color temperature Tc of the 35 W metal halide lamp of the embodiment of the present invention. The encapsulation ratio of TlI at this time is constant at 8% by weight.
【００１７】図３からも明らかなように、NaIの封入比
率を40重量％未満にすると、相関色温度Ｔｃが3700Kを
超える。一方、NaIの封入比率が60重量％を超えると、
相関色温度Ｔｃが2800K未満になり、平均演色評価数Ｒ
ａも80未満になる。つまり、NaIの封入比率を40〜60重
量％にすることで、平均演色評価数Ｒａが80以上で、か
つ相関色温度Ｔｃが2800〜3700Kのメタルハライドラン
プを得ることができる。As is clear from FIG. 3, when the NaI encapsulation ratio is less than 40% by weight, the correlated color temperature Tc exceeds 3700K. On the other hand, when the inclusion ratio of NaI exceeds 60% by weight,
Correlated color temperature Tc is less than 2800K, average color rendering index R
a is also less than 80. That is, by setting the NaI encapsulation ratio to 40 to 60% by weight, a metal halide lamp having an average color rendering index Ra of 80 or more and a correlated color temperature Tc of 2800 to 3700K can be obtained.
【００１８】図４に本発明実施例の35Wメタルハライド
ランプのTlIの封入比率と光色との関係を示す。このと
きのNaIの封入比率は、55重量％一定である。FIG. 4 shows the relationship between the encapsulation ratio of TlI and the light color of the 35 W metal halide lamp of the embodiment of the present invention. The NaI encapsulation ratio at this time was constant at 55% by weight.
【００１９】図４は、JIS Z9112-1990で決められてい
る、蛍光灯における電球色と温白色の色度範囲を示す。
なお、□印はTlIの封入比率が10重量％を、○印はTlIの
封入比率が6重量％をそれぞれ示す。図４からも明らか
なように、TlIの封入比率が10重量％を超えると、温白
色の色度範囲から外れ、緑っぽい光色になる。また、Tl
Iの封入比率が6重量％未満になると、電球色の色度範囲
から外れ、ピンクっぽい光色になる。つまり、TlIの封
入比率を6〜10重量％にすることで、黒体放射に近い電
球色、温白色を実現できる。FIG. 4 shows the chromaticity ranges of incandescent lamp color and warm white in a fluorescent lamp, which are determined by JIS Z9112-1990.
The □ mark indicates a TlI encapsulation ratio of 10% by weight, and the O mark indicates a TlI encapsulation ratio of 6% by weight. As is clear from FIG. 4, when the encapsulation ratio of TlI exceeds 10% by weight, the temperature goes out of the chromaticity range of warm white and a greenish light color is obtained. Also, Tl
When the encapsulation ratio of I is less than 6% by weight, it goes out of the chromaticity range of the light bulb color and becomes a pinkish light color. In other words, by adjusting the TlI encapsulation ratio to 6-10% by weight, it is possible to realize a warm white color and a bulb color close to black body radiation.
【００２０】上記実施例では、発光管内にDyI3,TlIおよ
びNaIを封入した場合について説明したが、DyI3の代わ
りに、TmI3,HoI3を用いても、上記と同様の結果が得ら
れた。[0020] In the above embodiment has described the case encapsulating DyI 3, TlI and NaI within the arc tube, instead of DyI 3, be used TmI 3, HoI 3, similar to the above results were obtained It was
【００２１】[0021]
【発明の効果】以上説明したように、本発明は黒体放射
に近く光色の相関色温度が2800〜3700Kであり、かつ寿
命特性に優れた30〜40Wの高演色メタルハライドランプ
を提供することができるものである。As described above, the present invention provides a high color rendering metal halide lamp of 30 to 40 W which has a light color correlated color temperature of 2800 to 3700 K, which is close to that of black body radiation, and which has excellent life characteristics. Is something that can be done.
【図１】本発明の一実施例である35Wメタルハライドラ
ンプの一部切欠正面図FIG. 1 is a partially cutaway front view of a 35W metal halide lamp according to an embodiment of the present invention.
【図２】発光管の全内表面積に対するランプ電力である
管壁負荷と平均演色評価数Ｒａおよび定格寿命6000時間
での光束維持率との関係図FIG. 2 is a diagram showing the relationship between the tube wall load, which is the lamp power, the average color rendering index Ra, and the luminous flux maintenance factor at a rated life of 6000 hours, with respect to the total inner surface area of the arc tube.
【図３】NaIの封入比率と平均演色評価数Ｒａおよび相
関色温度Ｔｃとの関係図FIG. 3 is a relationship diagram of NaI encapsulation ratio, average color rendering index Ra, and correlated color temperature Tc.
【図４】TlIの封入比率と光色との関係図[Fig.4] Relationship between TlI encapsulation ratio and light color
【符号の説明】 １ 発光管 ２ 外管 ３ 熱反射膜 ４ 透光性筒 ５ 金属板 ６ ステム線 ８ 口金[Explanation of symbols] 1 arc tube 2 outer tube 3 heat reflection film 4 translucent cylinder 5 metal plate 6 stem wire 8 base
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堤 伸吾 大阪府高槻市幸町１番１号 松下電子工業 株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shingo Tsutsumi 1-1, Saiwaicho, Takatsuki City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.
Claims (1)
ィスプロシウム(DyI3)、ヨウ化ツリウム(TmI3)およびヨ
ウ化ホルミウム(HoI3)のうち少なくとも１種を含むラン
タノイド系金属ハロゲン化物と封入ハロゲン化物総量に
対し40〜60重量％のヨウ化ナトリウム(NaI）と封入ハロ
ゲン化物総量に対し6〜10重量％のヨウ化タリウム(TlI)
と緩衝ガスとが封入された発光管と、前記発光管を内蔵
した外管とを具備し、前記発光管の全内表面積に対する
ランプ電力である管壁負荷が20〜26W/cm2であり、ラン
プ電力が30〜40Wでかつ相関色温度が2800〜3700Kである
ことを特徴とするメタルハライドランプ。1. A has electrodes at both ends, and the internal iodide dysprosium (DyI 3), lanthanide metal containing at least one of iodide thulium (TmI 3) and iodide holmium (HoI 3) 40-60 wt% sodium iodide (NaI) with respect to halide and total enclosed halide and 6-10 wt% thallium iodide (TlI) with respect to total enclosed halide
And a buffer gas filled with an arc tube, and an outer tube containing the arc tube, the tube wall load is 20 ~ 26 W / cm 2 is the lamp power to the total inner surface area of the arc tube, A metal halide lamp characterized by a lamp power of 30 to 40 W and a correlated color temperature of 2800 to 3700K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27199093A JP3159580B2 (en) | 1993-10-29 | 1993-10-29 | Metal halide lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27199093A JP3159580B2 (en) | 1993-10-29 | 1993-10-29 | Metal halide lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07130331A true JPH07130331A (en) | 1995-05-19 |
| JP3159580B2 JP3159580B2 (en) | 2001-04-23 |
Family
ID=17507618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27199093A Expired - Lifetime JP3159580B2 (en) | 1993-10-29 | 1993-10-29 | Metal halide lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3159580B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982760A1 (en) | 1998-08-28 | 2000-03-01 | Matsushita Electronics Corporation | Discharge lamp for automobile headlight and the automobile headlight |
| EP1511068A2 (en) * | 2003-08-29 | 2005-03-02 | Matsushita Electric Industrial Co., Ltd. | Dimmable metal halide lamp and lighting method |
| US7245081B2 (en) | 2003-03-03 | 2007-07-17 | Osram-Melco Toshiba Lighting Ltd. | High-intensity discharge lamp with particular metal halide gas filling and lighting device |
| WO2014021050A1 (en) * | 2012-08-03 | 2014-02-06 | 岩崎電気株式会社 | Ceramic metal halide lamp |
-
1993
- 1993-10-29 JP JP27199093A patent/JP3159580B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982760A1 (en) | 1998-08-28 | 2000-03-01 | Matsushita Electronics Corporation | Discharge lamp for automobile headlight and the automobile headlight |
| US6376988B1 (en) | 1998-08-28 | 2002-04-23 | Matsushita Electric Industrial Co., Ltd. | Discharge lamp for automobile headlight and the automobile headlight |
| US7245081B2 (en) | 2003-03-03 | 2007-07-17 | Osram-Melco Toshiba Lighting Ltd. | High-intensity discharge lamp with particular metal halide gas filling and lighting device |
| EP1511068A2 (en) * | 2003-08-29 | 2005-03-02 | Matsushita Electric Industrial Co., Ltd. | Dimmable metal halide lamp and lighting method |
| EP1511068A3 (en) * | 2003-08-29 | 2009-09-09 | Panasonic Corporation | Dimmable metal halide lamp and lighting method |
| WO2014021050A1 (en) * | 2012-08-03 | 2014-02-06 | 岩崎電気株式会社 | Ceramic metal halide lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3159580B2 (en) | 2001-04-23 |
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