JPH0834095B2 - Metal halide lamp - Google Patents
Metal halide lampInfo
- Publication number
- JPH0834095B2 JPH0834095B2 JP1970889A JP1970889A JPH0834095B2 JP H0834095 B2 JPH0834095 B2 JP H0834095B2 JP 1970889 A JP1970889 A JP 1970889A JP 1970889 A JP1970889 A JP 1970889A JP H0834095 B2 JPH0834095 B2 JP H0834095B2
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- electrode shaft
- molybdenum foil
- metal halide
- electrode
- 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.)
- Expired - Lifetime
Links
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明はメタルハライドランプ特には発光管の封止部
に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a metal halide lamp, and more particularly to a sealed portion of an arc tube.
（従来の技術） 一般にメタルハライドランプの発光管は石英ガラスか
らなる発光管バルブの端部を加熱して圧潰封止し，この
封止部に一端に主電極の電極軸を，他端には外部リード
線を溶接により接合してなるモリブデン箔を気密に封着
し，かつ，要すれば一方の封止部には上記主電極に近接
して補助電極が同じくモリブデン箔を介して封着されて
いる。なお，上記電極軸とモリブデン箔との溶接には溶
接強度の信頼性向上のために通常白金からなる溶接剤を
介在して行なわれている。(Prior Art) Generally, in the arc tube of a metal halide lamp, the end of the arc tube bulb made of quartz glass is heated and crushed and sealed. A molybdenum foil formed by welding the lead wires together is hermetically sealed, and if necessary, one of the sealing parts is provided with an auxiliary electrode close to the main electrode and also sealed via the molybdenum foil. There is. The welding of the electrode shaft and the molybdenum foil is usually performed with a welding agent made of platinum interposed to improve the reliability of the welding strength.
このような構成のランプは点滅を繰り返えされると，
発光管内に封入されている金属ハロゲン化物が電極軸と
石英ガラスとの封着部の隙間を通つて徐々に封止部内に
侵入し，遂には電極軸とモリブデンとの溶接部にまで達
し，上記溶接剤の白金と反応して溶接部を破壊し，ラン
プ不点を招くに至ることがある。When the lamp with such a configuration is repeatedly blinked,
The metal halide enclosed in the arc tube gradually penetrates into the sealing part through the gap between the sealing part of the electrode shaft and the quartz glass, and finally reaches the welding part of the electrode shaft and molybdenum. It may react with platinum as the welding agent and destroy the weld, leading to lamp defects.
一方，溶接剤である白金を使用しないと電極軸とモリ
ブデン箔との溶接部の接触抵抗が大きくなり，局部的に
温度が上昇して，これまた溶接部を破壊して短寿命とな
る欠点を生じる。On the other hand, if platinum, which is the welding agent, is not used, the contact resistance of the weld between the electrode shaft and molybdenum foil increases and the temperature rises locally, which also causes the weld to break and shorten the service life. Occurs.
（発明が解決しようとする課題） 上記したように従来のメタルハライドランプの発光管
はランプが点滅を繰り返されると発光管内の金属ハロゲ
ン化物が発光管バルブの封止部内に侵入し電極軸とモリ
ブデン箔との溶接部の溶接剤の白金と反応して溶接部を
破壊し，白金の溶接剤を使用しない場合には電極軸とモ
リブデン箔との溶接部の接触抵抗が大きく，局部的な温
度上昇によつて溶接部が破壊され短寿命になる欠点があ
つた。(Problems to be Solved by the Invention) As described above, in the arc tube of the conventional metal halide lamp, when the lamp is repeatedly blinked, the metal halide in the arc tube penetrates into the sealing portion of the arc tube bulb and the electrode shaft and the molybdenum foil. If the platinum welding agent is not used, the contact resistance between the electrode shaft and the molybdenum foil will be large, resulting in a local temperature rise. Therefore, there is a drawback that the welded part is broken and the life is shortened.
本発明は上期欠点を防止する課題に対してなされたも
ので，発光管封止部内の電極軸とモリブデン箔との接合
部が金属ハロゲン化物や局部的発熱によつて早期に破壊
されるのを防止して，長寿命のメタルハライドランプを
提供することを目的とする。The present invention has been made to solve the problem of preventing the first-half defects, and it is necessary to prevent the joint portion between the electrode shaft and the molybdenum foil in the arc tube sealing portion from being destroyed early by a metal halide or local heat generation. The purpose is to provide a metal halide lamp with a long life.
（課題を解決するための手段） 本発明は電極軸とモリブデン箔とを白金のような溶接
剤を介在させることなしに直接溶接し，かつ，ランプ定
格点灯時のランプ電流をＩ（Ａ），電極軸径をｄ（m
m），電極軸とモリブデン箔との溶接接合長をｌ（mm）
としたとき， の関係を満足するようにした点に特徴がある。(Means for Solving the Problems) The present invention directly welds an electrode shaft and a molybdenum foil without interposing a welding agent such as platinum, and sets the lamp current when the lamp is rated to I (A), The electrode shaft diameter is d (m
m), welding joint length of electrode shaft and molybdenum foil is 1 (mm)
When It is characterized in that the relationship of is satisfied.
（作 用） 本発明メタルハライドランプは，電極軸とモリブデン
箔とが溶接剤を介在させずに直接溶接されており，した
がつて上記電極軸とモリブデン箔との接合部に金属ハロ
ゲン化物が侵入してきても，従来のように白金の接合剤
が使用されていないから早期に破壊されることはない。
さらにランプ電流Ｉ（Ａ），電極軸径ｄ（mm），電極軸
とモリブデン箔との溶接接合長ｌ（mm）の間の関係が になつており，上記関係になつていると電極軸とモリブ
デン箔との接合部の早期破壊の発生はない。(Operation) In the metal halide lamp of the present invention, the electrode shaft and the molybdenum foil are directly welded without the interposition of a welding agent. Therefore, the metal halide enters the joint between the electrode shaft and the molybdenum foil. However, unlike the conventional method, no platinum bonding agent is used, so it will not be destroyed early.
Furthermore, the relationship among the lamp current I (A), the electrode shaft diameter d (mm), and the welding joint length l (mm) between the electrode shaft and molybdenum foil is In the above relationship, there is no premature failure of the joint between the electrode shaft and molybdenum foil.
（実施例） 以下，本発明の詳細を図示の一実施例を参照して説明
する。(Example) Hereinafter, details of the present invention will be described with reference to an illustrated example.
第１図は100Wのメタルハライドランプの発光管の縦断
面図を示し，（１）は内径約10.5mmの石英ガラスからな
る発光管バルブで，内部には始動用希ガスとして例えば
アルゴンが100トール，水銀20mg,スカンジウムメタル0.
1mgおよび金属ハロゲン化物としてよう化スカンジウム
とよう化ナトリウムが計10mg封入されている。Fig. 1 shows a vertical cross-sectional view of the arc tube of a 100W metal halide lamp. (1) is an arc tube bulb made of quartz glass with an inner diameter of about 10.5 mm. Mercury 20 mg, scandium metal 0.
1 mg and a total of 10 mg of scandium iodide and sodium iodide as metal halides are enclosed.
（２），（３）は発光管バルブ（１）の両端に距離17
mmを隔だてて対向設置された一対のタングステンからな
る主電極で，それぞれ径ｄが0.3mmの電極軸（2a），（3
a）にコイル（2b），（3b）を巻装してなり，また
（４）は一方の主電極（2b）に近接して設けられた始動
用の補助電極である。(2) and (3) have a distance of 17 at both ends of the arc tube bulb (1).
A pair of main electrodes made of tungsten and facing each other with a diameter of 0.3 mm, each having a diameter d of 0.3 mm and having electrode shafts (2a), (3
The coils (2b) and (3b) are wound around (a), and (4) is an auxiliary electrode for starting provided in the vicinity of one main electrode (2b).
上記各電極（２），（３），（４）は発光管の封止部
（５），（６）に気密に封着された幅2mm,最大厚さ約28
μｍ長さ6mmのモリブデン箔（7a），（7b），（7c）の
一端に接合長ｌ（mm）が1.5mmになるように溶接され，
モリブデン箔（7a），（7b），（7c）の他端には外部リ
ード線（8a），（8b），（8c）がそれぞれ接続されてい
る。Each of the electrodes (2), (3) and (4) is hermetically sealed in the sealing parts (5) and (6) of the arc tube with a width of 2 mm and a maximum thickness of about 28.
Welded to one end of molybdenum foil (7a), (7b), (7c) with a length of 6 mm and a joint length l (mm) of 1.5 mm,
External lead wires (8a), (8b) and (8c) are connected to the other ends of the molybdenum foils (7a), (7b) and (7c), respectively.
ついで，発光管は内部を真空または窒素，不活性ガス
等を封入した外管内に封装されメタルハライドランプが
できあがる。このランプの定格点灯時のランプ電流値Ｉ
（Ａ）は1Aである。Then, the arc tube is sealed in a vacuum tube or an outer tube filled with nitrogen, an inert gas, etc., and a metal halide lamp is completed. Lamp current value I at rated lighting of this lamp
(A) is 1A.
ところで，電極軸（2a），（3a）とモリブデン箔（7
a），（7b）との溶接接合部の破壊に影響を与えるもの
としては，ハロゲン化物の侵入と局部的な発熱等がある
ことは先に述べたが，局部的発熱は電極軸（2a），（3
a）とモリブデン箔（7a），（7b）との接触面積と，そ
こに流れる電流の大きさが主な要因と考えられる。By the way, electrode shafts (2a), (3a) and molybdenum foil (7
As mentioned above, the factors that affect the destruction of the welded joints with a) and (7b) are halide intrusion and local heat generation. However, the local heat generation is the electrode shaft (2a). , (3
The main factors are considered to be the contact area between a) and molybdenum foils (7a) and (7b) and the magnitude of the current flowing there.
なお，接触面積は（電極軸径ｄ×溶接接合長ｌ）に比
例するので，結局は局部的発熱はランプ電流Ｉ（Ａ），
電極軸径ｄ（mm）および電極軸とモリブデン箔との溶接
接合長ｌ（mm）に関係する。In addition, since the contact area is proportional to (electrode shaft diameter d × welding joint length l), the local heat is eventually generated by the lamp current I (A),
It is related to the electrode shaft diameter d (mm) and the welding joint length l (mm) between the electrode shaft and molybdenum foil.
上記実施例の場合，これらの関係は I/4d＝1/4×0.3＝1/1.2≒0.83 ｌ＝1.5mm したがつて， ｌ＞I/4d の関係にある。 In the case of the above-mentioned embodiment, these relations are I / 4d = 1/4 × 0.3 = 1 / 1.2≈0.83 l = 1.5 mm, and therefore l> I / 4d.
このような構成のランプは，その寿命中に発光管封止
部内の電極軸（2a），（3a）とモリブデン箔（7a），
（7b）との各接合部にまで金属ハロゲン化物が侵入して
きても，接合部には従来のように白金からなる接合剤が
使用されていないから金属ハロゲン化物によつて早期に
破壊されることはないし，またｌ＞I/4dの関係を維持す
ることによつて局部的発熱による破壊に対しても耐性が
あり，長寿命を得ることができる。During the life of the lamp having such a structure, the electrode shafts (2a), (3a), the molybdenum foil (7a), and
Even if the metal halide penetrates into each joint with (7b), it will be destroyed early by the metal halide because the conventional bonding agent made of platinum is not used in the joint. Moreover, by maintaining the relationship of 1> I / 4d, it is resistant to damage due to local heat generation and a long life can be obtained.
次に上記ランプ電流Ｉ（Ａ），電極軸径ｄ（mm）およ
び電極軸とモリブデン箔との溶接接合長ｌ（mm）の間の
関係と，電極軸とモリブデン箔との接合部の強度との関
連性を100Wおよび400Wの各ランプについて試験した結果
を第２図に示す。Next, the relationship between the lamp current I (A), the electrode shaft diameter d (mm), and the welding joint length 1 (mm) between the electrode shaft and the molybdenum foil, and the strength of the joint between the electrode shaft and the molybdenum foil. FIG. 2 shows the results of testing the relevance of the lamps for 100 W and 400 W lamps.
図において横軸には電極軸径ｄ（mm）を，縦軸には溶
接接合長ｌ（mm）をとり，ランプ電流Ｉ（Ａ）は100Wラ
ンプでは1A,400Wランプでは3.3Aである。In the figure, the horizontal axis represents the electrode shaft diameter d (mm) and the vertical axis represents the welding joint length l (mm), and the lamp current I (A) is 1 A for a 100 W lamp and 3.3 A for a 400 W lamp.
試験は各ランプを3,000時間点灯し，電極軸とモリブ
デン箔との接合部における異状発生の有無を調べた。
○，●印は100Wランプで，○は良品，●は不良品を示
す。△，▲印は400Wランプで，△は良品，▲は不良品を
示す。In the test, each lamp was lit for 3,000 hours, and the occurrence of abnormalities in the joint between the electrode shaft and molybdenum foil was examined.
The ○ and ● marks are 100 W lamps, ○ indicates a good product and ● indicates a defective product. △ and ▲ are 400W lamps, △ is good and ▲ is defective.
曲線Ａは100Wランプにおける良品と不良品との境界線
を示し，その値は である。したがつて,100Wランプにおいては とすれば電極軸とモリブデン箔との接合部に早期破壊を
生じない良品が得られることが判かる。Curve A shows the boundary line between a good product and a defective product in a 100W lamp. Is. Therefore, in the 100W lamp Then, it can be seen that a non-defective product which does not cause premature destruction at the joint between the electrode shaft and the molybdenum foil can be obtained.
また，曲線Ｂは400Wランプにおける良品と不良品との
境界線を示し，その値は である。Curve B shows the boundary line between a good product and a defective product in a 400W lamp, and the value is Is.
したがつて,400Wランプにおいては とすれば上記100Wランプと同様な良品が得られる。Therefore, in the 400W lamp Then, a good product similar to the above 100 W lamp can be obtained.
ところで,100Wランプにおけるランプ電流Ｉ（Ａ）は
上記のように1Aであり,400Wランプでは3.3Aであるか
ら，入力に関係なく一般式で現わすと， とすれば良品が得られることになる。By the way, since the lamp current I (A) in a 100W lamp is 1A as described above and is 3.3A in a 400W lamp, it can be expressed by a general formula regardless of the input, If so, a good product will be obtained.
以上詳述したように本発明は，発光管封止部に気密に
封着されるモリブデン箔に電極軸を直接溶接し，かつ，
ランプ電流，電極軸径および溶接接合長の間の関係を規
制するようにしたので，上記溶接接合部が侵入してきた
金属ハロゲン化物や局部的な発熱によつて早期に破壊さ
れることを防止でき，長寿命のメタルハライドランプを
得ることができる。As described in detail above, according to the present invention, the electrode shaft is directly welded to the molybdenum foil that is hermetically sealed to the arc tube sealing portion, and
Since the relationship between the lamp current, the electrode shaft diameter and the welded joint length is regulated, it is possible to prevent the welded joint from being destroyed early due to invading metal halide or localized heat generation. ， You can get a long life metal halide lamp.
第１図は本発明の一実施例であるメタルハライドランプ
の発光管の縦断面図，第２図はランプ電流（Ｉ），電極
軸径（ｄ），電極軸とモリブデン箔との接合長（ｌ）の
各因子と接合部の強度との関係を示す曲線図である。 （１）……発光管バルブ，（２），（３）……主電極， （2a），（3a）……電極軸， （7a），（7b）……モリブデン箔， （8a），（8b）……外部リード線， （ｌ）……接合長FIG. 1 is a longitudinal sectional view of an arc tube of a metal halide lamp which is an embodiment of the present invention, and FIG. 2 is a lamp current (I), an electrode shaft diameter (d), a joint length (l) of an electrode shaft and a molybdenum foil. FIG. 7 is a curve diagram showing the relationship between each factor of FIG. (1) …… Arc tube bulb, (2), (3) …… Main electrode, (2a), (3a) …… Electrode shaft, (7a), (7b) …… Molybdenum foil, (8a), ( 8b) …… External lead wire, (l) …… Joint length
───────────────────────────────────────────────────── フロントページの続き (72)発明者 神谷 明宏 神奈川県横須賀市船越町１―201―１ 株 式会社東芝横須賀工場内 (56)参考文献 実公 昭53−13251（ＪＰ，Ｙ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Kamiya 1-20-11-1 Funakoshi-cho, Yokosuka City, Kanagawa Prefecture Yokosuka Factory, Toshiba Corporation (56) Bibliographic Reference Sho 53-13251 (JP, Y2)
Claims (1)
形成した封止部にモリブデン箔を気密に封着し，モリブ
デン箔の一端に主電極の電極軸を，他端に外部リード線
を溶接してなるメタルハライドランプにおいて，上記電
極軸とモリブデン箔とは直接溶接し，かつ，ランプ定格
点灯時のランプ電流をＩ（Ａ），電極軸径をｄ（mm），
電極軸とモリブデン箔との溶接接合長をｌ（mm）とした
とき， の関係を満足するようにしたことを特徴とするメタルハ
ライドランプ。1. A molybdenum foil is hermetically sealed to a sealing portion formed at an end portion of an arc tube bulb made of quartz glass, an electrode shaft of a main electrode is provided at one end of the molybdenum foil, and an external lead wire is provided at the other end. In a welded metal halide lamp, the electrode shaft and molybdenum foil are directly welded, and the lamp current when the lamp is lit is I (A), the electrode shaft diameter is d (mm),
When the welding joint length between the electrode shaft and molybdenum foil is 1 (mm), The metal halide lamp is characterized by satisfying the above relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970889A JPH0834095B2 (en) | 1989-01-31 | 1989-01-31 | Metal halide lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970889A JPH0834095B2 (en) | 1989-01-31 | 1989-01-31 | Metal halide lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01281656A JPH01281656A (en) | 1989-11-13 |
| JPH0834095B2 true JPH0834095B2 (en) | 1996-03-29 |
Family
ID=12006787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1970889A Expired - Lifetime JPH0834095B2 (en) | 1989-01-31 | 1989-01-31 | Metal halide lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0834095B2 (en) |
-
1989
- 1989-01-31 JP JP1970889A patent/JPH0834095B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01281656A (en) | 1989-11-13 |
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