JPH0917380A - Large capacity short arc metal halide lamp - Google Patents
Large capacity short arc metal halide lampInfo
- Publication number
- JPH0917380A JPH0917380A JP18664095A JP18664095A JPH0917380A JP H0917380 A JPH0917380 A JP H0917380A JP 18664095 A JP18664095 A JP 18664095A JP 18664095 A JP18664095 A JP 18664095A JP H0917380 A JPH0917380 A JP H0917380A
- Authority
- JP
- Japan
- Prior art keywords
- arc tube
- sealing
- main electrode
- lamp
- cross
- 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
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は大容量ショートアークメ
タルハライドランプに関し、その発光管封止部の改良に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-capacity short arc metal halide lamp, and to an improvement of the arc tube sealing portion thereof.
【0002】[0002]
【従来の技術】近年、サッカー場等のように大きなスポ
ーツエリアを無駄なく照明し、カラー放映用に適するよ
うにしたランプとして、発光管の両電極間長が30mm程
度のアーク長が短く大容量で、発光効率及び演色性が高
いショートアークメタルハライドランプが提案されてい
る。このランプはコンパクトに設計された器具内に配置
することにより、周辺地域に光公害を起こさないように
考慮され、特に、大きなグラウンド照明用ランプとして
最適である。2. Description of the Related Art In recent years, as a lamp adapted to illuminate a large sports area such as a soccer field without waste and to be suitable for color broadcasting, the arc length is about 30 mm between the electrodes of the arc tube and the capacity is large. Therefore, a short arc metal halide lamp having a high luminous efficiency and a high color rendering property has been proposed. By placing the lamp in a fixture designed to be compact, it is considered not to cause light pollution in the surrounding area, and it is particularly suitable as a large ground lighting lamp.
【0003】[0003]
【発明が解決しようとする課題】この種のランプを製造
する場合、石英管を数種同心円状に配置し、中心に電極
とモリブデン箔とを接続して構成した電極マウントを位
置させ、一旦全体を真空にした後、バーナにて封止すべ
き個所を加熱することにより石英を徐々に溶融すること
により外気と発光部とを気密に密閉する溶封方式により
行なっている。そして、このように作成した発光管内に
始動補助ガス及び水銀と共に金属ハロゲン化物を封入し
てショートアークメタルハライドランプを製造してい
る。When manufacturing this type of lamp, several types of quartz tubes are arranged in concentric circles, and an electrode mount constituted by connecting an electrode and a molybdenum foil is positioned at the center, and once the whole is mounted, After evacuating, the place to be sealed is heated with a burner to gradually melt the quartz, thereby sealing the outside air and the light emitting part hermetically. Then, a metal halide is enclosed together with a starting auxiliary gas and mercury in the arc tube thus created to manufacture a short arc metal halide lamp.
【0004】しかし、ランプの寿命期間中に主電極とモ
リブデン箔との接続部である封止部に金属ハライドが浸
入することにより接触抵抗が増加し、かつ該接続部には
大きな電流が流れるので、該封止部が過剰に加熱される
結果いわゆるクラックが発生し、ついには発光部である
膨出部の胴中までクラックが達して発光管が破裂すると
いう恐れがある。そして、コンパクトな器具の前面ガラ
ス等を破損させたり、器具内の反射鏡を劣化させたりす
るとの問題がある。However, during the life of the lamp, the contact resistance increases due to the metal halide infiltrating into the sealing portion, which is the connecting portion between the main electrode and the molybdenum foil, and a large current flows through the connecting portion. As a result of excessive heating of the sealing portion, so-called cracks may occur, and eventually the cracks may reach the inside of the body of the bulging portion, which is the light emitting portion, and the arc tube may burst. Then, there is a problem that the front glass or the like of the compact instrument is damaged or the reflecting mirror in the instrument is deteriorated.
【0005】本発明は前記に鑑みてなされたもので、溶
封方式により製造する発光管の封止部のうち、発光管の
両端に形成した凹部の断面積と電極芯棒とモリブデン箔
との接続部を含む部分の断面積とを所定の範囲に選定す
ることにより、ランプ寿命中あるいは寿命末期に生ずる
ことがある発光管封止部のクラックを防止することによ
り、長寿命で、高効率かつ高演色である、グランド等の
照明用に最適な大容量ショートアークメタルハライドラ
ンプを提供することを目的とする。The present invention has been made in view of the above, and in the sealing portion of the arc tube manufactured by the fusion-sealing method, the cross-sectional areas of the recesses formed at both ends of the arc tube, the electrode core rod, and the molybdenum foil are formed. By selecting the cross-sectional area of the part including the connection part within a predetermined range, by preventing cracks in the arc tube sealing part that may occur during or at the end of the lamp life, long life, high efficiency and It is an object of the present invention to provide a large-capacity short arc metal halide lamp which has a high color rendering and is optimal for lighting such as a ground.
【0006】[0006]
【課題を解決するための手段】前記目的を達成するため
に本発明は、石英製発光管の両端に少なくとも主電極を
封着し、該発光管はその中央の膨出部とその両端に一体
に形成した封止部とよりなり、かつ発光管の両端の電極
芯棒とモリブデン箔とを接続して該封止部に一体的に埋
設してなり、定格電流が10A以上で外管を用いずに点
灯されるショートアークメタルハライドランプにおい
て、前記膨出部と封止部との境界部の外周にその全周に
わたって凹部を形成してなり、前記凹部の主電極埋設部
の胴中側に位置する封止部の断面積をAとし、主電極と
モリブデン箔との接続部を含む封止部の断面積をBとし
た場合、A/B≦0.8であることを特徴とする。In order to achieve the above object, the present invention is to seal at least a main electrode on both ends of a quartz arc tube, and the arc tube is integrally formed on a central bulge and both ends thereof. And a molybdenum foil are connected to the electrode core rods at both ends of the arc tube and are integrally embedded in the sealing part, and the rated current is 10 A or more and an outer tube is used. In a short arc metal halide lamp that is turned on without a recess, a recess is formed over the entire circumference of the boundary between the bulging part and the sealing part, and the recess is located on the inner side of the body of the main electrode embedded part. A / B ≦ 0.8, where A is the cross-sectional area of the sealed portion and B is the cross-sectional area of the sealed portion including the connection between the main electrode and the molybdenum foil.
【0007】[0007]
【作用】前記構成により、ランプ点灯中に金属ハロゲン
化物が発光管封止部に浸入して電極芯棒とモリブデン箔
との接続部にクラックが発生したとしても、発光部であ
る膨出部の胴中部分までクラックが生じることはなく、
発光管の破裂という不慮の事故が生じることはない。With the above structure, even if a metal halide enters the arc tube sealing portion during lamp lighting and a crack occurs at the connecting portion between the electrode core rod and the molybdenum foil, the bulging portion of the light emitting portion is not affected. No cracks occur in the middle of the body,
There is no accidental rupture of the arc tube.
【0008】[0008]
【実施例】以下、本発明の実施例を図面に基づき説明す
る。図1は発光管の側面図であり、石英製発光管1の中
央には発光部であるほぼ楕円形状の膨出部2が形成さ
れ、その両端には封止部3,3が形成されている。又、
膨出部2と封止部3との境界部の全周にわたって凹部
4,4が形成されている。そして、発光管の両端には主
電極5,5が封着され、主電極の電極心棒5b,5bと
モリブデン箔6,6とは溶接により接続され、前記封止
部3,3に一体的に埋設されている。更に、発光管の封
止部の端部には一対の口金7,7が固定され、かつ外部
リード線8,8を介して電力供給用の端子9,9が接続
されている。なお、前記発光管の主電極の外周には白色
の耐熱性酸化物からなる保温膜10,10が被着されて
いる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the arc tube. A quartz arc tube 1 is provided with a substantially elliptical bulging portion 2 which is a light emitting portion, and sealing portions 3 and 3 are formed at both ends thereof. There is. or,
Recesses 4 and 4 are formed along the entire circumference of the boundary between the bulging portion 2 and the sealing portion 3. The main electrodes 5 and 5 are sealed at both ends of the arc tube, the electrode cores 5b and 5b of the main electrodes and the molybdenum foils 6 and 6 are connected by welding, and the sealing parts 3 and 3 are integrally formed. It is buried. Further, a pair of caps 7, 7 are fixed to the ends of the sealed portion of the arc tube, and terminals 9, 9 for power supply are connected via external lead wires 8, 8. In addition, a heat insulating film 10 made of white heat-resistant oxide is applied to the outer periphery of the main electrode of the arc tube.
【0009】そして、発光管内には沃化ディスプロシウ
ム、沃化ネオジウム、沃化セシウムを重量比にして
(4:2:3)としたハロゲン化物を12mg、始動捕助
ガスとしてのアルゴンを100トールと共にバッファガ
スとしての水銀を約60mgを封入している。本実施例の
発光管1は、外径がφ40mm、内径がφ32mmの最大径
を有するほぼ楕円形状の発光部である膨出部2を有して
いる。又、主電極5としてタングステン棒からなるφ
2.0mm、長さ25mmの電極芯棒5bにφ1.2mmの線
径のタングステン線を巻き付けて、その長さを10mmと
し芯棒の先端より2.5mm離したコイル部5aを設ける
ことにより構成している。この主電極5はモリブデン箔
6に電気的に接続されかつ外部リード線に継線されてお
り、口金7及び外部リード線8を介して端子9に接続
し、電力供給が両端子9,9により受電できるようにな
っている。又、口金7は照明器具内に正確に取り付けら
れるような構造となっており、器具内に正確に取り付け
られた際に適正な配光が得られるようにしてある。Then, in the arc tube, 12 mg of a halide containing dysprosium iodide, neodymium iodide, and cesium iodide in a weight ratio of (4: 2: 3) and 100 g of argon as a starting trapping gas are used. About 60 mg of mercury as a buffer gas is enclosed together with Thor. The arc tube 1 of the present embodiment has a bulging portion 2 which is a substantially elliptical light emitting portion having a maximum diameter of 40 mm in outer diameter and 32 mm in inner diameter. In addition, φ made of a tungsten rod as the main electrode 5
A coil wire 5a having a diameter of 1.2 mm is wound around an electrode core rod 5b having a length of 2.0 mm and a length of 25 mm, the length thereof is 10 mm, and a coil portion 5a is provided 2.5 mm away from the tip of the core rod. doing. The main electrode 5 is electrically connected to the molybdenum foil 6 and is connected to the external lead wire, and is connected to the terminal 9 via the base 7 and the external lead wire 8 so that power is supplied by both terminals 9, 9. It is ready to receive power. Further, the base 7 is structured so that it can be accurately mounted in the lighting equipment, so that proper light distribution can be obtained when it is correctly mounted in the lighting equipment.
【0010】次に、図2に基づき主電極とモリブデン箔
との電気的接線を行なう部分を溶接して接続している発
光管封止部を図2に基づき説明する。発光管の膨出部2
と封止部3との境界部の外周にはその全周にわたって凹
部4を形成しており、前記封止部3には先端にコイル部
5aを設けた電極芯棒5bよりなる主電極5の端部とモ
リブデン箔6の端部とを溶接により接続している。そし
て、前記凹部に埋設した主電極の胴中側に位置する封止
部の断面積をAとし、主電極とモリブデン箔との接続部
を含む封止部の断面積をBとした場合の比率A/B≦
0.8の範囲に選定している。前記実施例では、接続部
に位置する断面積をBは2cm2であり、胴中に近い側の
凹部の最小断面積Aを1.5cm2としている。この場
合、A/B=0.75である。Next, the arc tube sealing portion to which the main electrode and the molybdenum foil are electrically connected to each other by welding will be described with reference to FIG. Swelling part 2 of arc tube
A concave portion 4 is formed on the entire outer periphery of the boundary between the sealing portion 3 and the sealing portion 3, and the sealing portion 3 has a main electrode 5 composed of an electrode core rod 5b provided with a coil portion 5a at its tip. The end portion and the end portion of the molybdenum foil 6 are connected by welding. Then, a ratio when the cross-sectional area of the sealing portion located on the inner side of the main electrode embedded in the recess is A and the cross-sectional area of the sealing portion including the connecting portion between the main electrode and the molybdenum foil is B. A / B ≦
It is selected in the range of 0.8. In the above-mentioned embodiment, the cross-sectional area B located at the connecting portion is 2 cm 2 , and the minimum cross-sectional area A of the concave portion on the side closer to the body is 1.5 cm 2 . In this case, A / B = 0.75.
【0011】具体的な実験例について説明する。前記の
ように、発光管封止部の最小断面積Aを他方の断面積B
に対して80%以下に選定するようにした発光管からな
り外管を用いることなく点灯するショートアークメタル
ハライドランプを管入力2KWで、ランプ電圧110
V、定格電流が20Aで点灯し、その寿命試験を行なっ
たところ、サンプル数50本中13本が3000時間内
に主電極とモリブデン箔との接続部が金属ハロゲン化物
に侵食され封止部にクラックが発生して、ついには不点
となった。しかし、このクラックは図2に示す発光管封
止部の胴中に近い側の封止部の範囲内でおさまり、胴中
部分までクラックが進展することがなく、発光管の破裂
という最悪の事態は避けられた。一方、従来構造の前記
と同仕様のランプ(胴中に近い側の封止部を細く絞らず
に溶接部を含む封止部と同一の断面積としたランプ)
は、前記と同様の寿命試験において、50本中12本に
クラックが発生したばかりか、発光管の破裂を伴うもの
が9本も発生していた。A specific experimental example will be described. As described above, the minimum sectional area A of the arc tube sealing portion is set to the other sectional area B
A short arc metal halide lamp consisting of an arc tube selected to be 80% or less of the above and lit without using an outer tube is provided with a tube input of 2 kW and a lamp voltage of 110.
When the life test was performed with V and rated current turned on at 20 A, 13 of 50 samples were 3,000 hours in which the connection between the main electrode and the molybdenum foil was corroded by the metal halide and became the sealing part. A crack occurred and finally became a flaw. However, this crack is settled within the range of the sealing portion of the sealing portion of the arc tube shown in FIG. 2 which is closer to the inside of the barrel, and the crack does not propagate to the inside portion of the barrel. Was avoided. On the other hand, a lamp with the same specifications as the above with a conventional structure (a lamp having the same cross-sectional area as the sealing portion including the welded portion without narrowing the sealing portion near the inside of the body)
In the same life test as described above, not only 12 of 50 cracks but also 9 of which caused the arc tube to rupture.
【0012】このように、胴中に近い側の凹部の断面積
を溶接部を含む封止部の断面積に対し80%以下にする
ことにより、ランプ寿命期間中、ハロゲン化物が封止部
内の接続部に侵入することで接触抵抗が増し、かつ該接
続部には大きな電流が流れるので、それに伴ない発生す
る封止部のクラックに起因する発光管の破裂が生じるこ
とがない。なお、A/Bの比が80%以上の断面積とな
るように封止部が形成されると、従来と同様にクラック
に基づく発光管の破裂が生じる恐れがある。又、定格電
流が10A以下のランプでは、封止部の過度の発熱によ
るクラックが生じることはあまりなく、ランプ電流が1
0A以上の大きな電流を設計条件としたショートアーク
メタルハライドランプにおいて、その効果が認められ
る。As described above, by making the cross-sectional area of the concave portion near the inside of the barrel 80% or less of the cross-sectional area of the sealing portion including the welded portion, the halide is kept in the sealing portion during the life of the lamp. Since the contact resistance is increased by entering the connection portion and a large current flows through the connection portion, the arc tube is not ruptured due to the crack in the sealing portion which is generated due to the contact resistance. When the sealing portion is formed so that the A / B ratio has a cross-sectional area of 80% or more, the arc tube may be ruptured due to cracks as in the conventional case. Further, in a lamp having a rated current of 10 A or less, cracks due to excessive heat generation in the sealing portion are rarely generated, and the lamp current is 1
The effect is recognized in the short arc metal halide lamp in which a large current of 0 A or more is used as the design condition.
【0013】[0013]
【発明の効果】以上の説明から明らかなように、本発明
に係わる大容量ショートアークメタルハライドランプ
は、発光管封止部の断面形状を工夫し、かつその断面積
の比率を一定の範囲に選定することにより、ランプ点灯
時間の経過と共に発生する発光管の封止部におけるクラ
ックをランプ不点の範囲に止めることができ、発光管破
裂に伴う不慮の事故が生じる恐れがない。又、グランド
等の照明用として最適な、コンパクトで高効率かつ高演
色性であるとの優れたランプ特性を有するとの利点があ
る。As is apparent from the above description, in the large-capacity short arc metal halide lamp according to the present invention, the cross-sectional shape of the arc tube sealing portion is devised, and the cross-sectional area ratio is selected within a certain range. By doing so, it is possible to prevent cracks in the sealed portion of the arc tube that occur with the lapse of the lamp lighting time within the range of the lamp imperfections, and there is no risk of an accident resulting from the burst of the arc tube. Further, there is an advantage that it has an excellent lamp characteristic that is compact, highly efficient, and has a high color rendering property, which is optimum for illumination of a ground or the like.
【図1】本発明に係わるショートアークメタルハライド
ランプの実施例を示す側面図である。FIG. 1 is a side view showing an embodiment of a short arc metal halide lamp according to the present invention.
【図2】同じく、発光管の要部を示す説明図である。FIG. 2 is likewise an explanatory view showing a main part of an arc tube.
1 発光管 2 膨出部 3,3 封止部 4,4 凹部 5,5 主電極 5a 電極芯棒 5b 電極コイル部 6,6 モリブデン箔 7,7 口金 8,8 外部リード線 9,9 端子 10,10 保温膜 1 arc tube 2 bulging part 3,3 sealing part 4,4 recess 5,5 main electrode 5a electrode core 5b electrode coil part 6,6 molybdenum foil 7,7 base 8,8 external lead wire 9,9 terminal 10 , 10 Insulating film
Claims (1)
を封着し、該発光管はその中央の膨出部とその両端に一
体に形成した封止部とよりなり、かつ発光管の両端の電
極芯棒とモリブデン箔とを接続して該封止部に一体的に
埋設してなり、定格電流が10A以上で外管を用いずに
点灯されるショートアークメタルハライドランプにおい
て、前記膨出部と封止部との境界部の外周にその全周に
わたって凹部を形成してなり、前記凹部の主電極埋設部
の胴中側に位置する封止部の断面積をAとし、主電極と
モリブデン箔との接続部を含む封止部の断面積をBとし
た場合、A/B≦0.8であることを特徴とする大容量
ショートアークメタルハライドランプ1. A quartz arc tube is sealed with at least a main electrode at both ends thereof, and the arc tube is composed of a central bulge portion and sealing portions integrally formed at both ends thereof, and both ends of the arc tube. In the short arc metal halide lamp, in which the electrode core rod and the molybdenum foil are connected to each other and embedded in the sealing portion, and the rated current is 10 A or more and the lamp is lit without using an outer bulb, the bulging portion A concave portion is formed on the entire outer circumference of the boundary portion between the main electrode and the sealing portion, and the cross-sectional area of the sealing portion located inside the main electrode embedded portion of the concave portion is A, and the main electrode and molybdenum are separated. A / B ≦ 0.8, where B is the cross-sectional area of the sealing portion including the connection portion with the foil, and is a large capacity short arc metal halide lamp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18664095A JPH0917380A (en) | 1995-06-30 | 1995-06-30 | Large capacity short arc metal halide lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18664095A JPH0917380A (en) | 1995-06-30 | 1995-06-30 | Large capacity short arc metal halide lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0917380A true JPH0917380A (en) | 1997-01-17 |
Family
ID=16192132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18664095A Pending JPH0917380A (en) | 1995-06-30 | 1995-06-30 | Large capacity short arc metal halide lamp |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0917380A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100352918B1 (en) * | 1998-05-25 | 2002-09-16 | 마츠시타 덴끼 산교 가부시키가이샤 | Lamp and manufacturing method thereof |
-
1995
- 1995-06-30 JP JP18664095A patent/JPH0917380A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100352918B1 (en) * | 1998-05-25 | 2002-09-16 | 마츠시타 덴끼 산교 가부시키가이샤 | Lamp and manufacturing method thereof |
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