JPS6235254Y2 - - Google Patents
Info
- Publication number
- JPS6235254Y2 JPS6235254Y2 JP1976036085U JP3608576U JPS6235254Y2 JP S6235254 Y2 JPS6235254 Y2 JP S6235254Y2 JP 1976036085 U JP1976036085 U JP 1976036085U JP 3608576 U JP3608576 U JP 3608576U JP S6235254 Y2 JPS6235254 Y2 JP S6235254Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- coil
- diameter
- refractory metal
- 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.)
- Expired
Links
- 239000003870 refractory metal Substances 0.000 claims description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 15
- 239000011888 foil Substances 0.000 description 10
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 9
- 229910052750 molybdenum Inorganic materials 0.000 description 9
- 239000011733 molybdenum Substances 0.000 description 9
- 229910052721 tungsten Inorganic materials 0.000 description 9
- 239000010937 tungsten Substances 0.000 description 9
- 238000004804 winding Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 5
- 229910001507 metal halide Inorganic materials 0.000 description 4
- 150000005309 metal halides Chemical class 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 description 1
- 229910003452 thorium oxide Inorganic materials 0.000 description 1
Landscapes
- Discharge Lamp (AREA)
Description
【考案の詳細な説明】
本考案は放電灯用電極、殊にメタルハライドラ
ンプ等に使用する大電流用電極の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of electrodes for discharge lamps, particularly large current electrodes used in metal halide lamps and the like.
従来、この種の放電灯用電極として、ランプ電
流の小さい場合には直径の小さい難融性金属棒に
コイルを巻回して使用し、電流が大きい場合には
前記難融性金属棒の直径を大きくするかまたは、
第１図に示した如く先端部に直径の大なる部分
１′と他端部にモリブデン箔と溶接するため圧延
偏平加工された電極足部１″を備えたタングステ
ン等よりなる電極々芯１と、該電極々芯の外周に
巻回されたタングステン等よりなる内、外二層の
コイル２，３より構成された電極が使用されてい
る。ランプ電流が大きい場合、電極先端部の直径
が大きくかつ熱容量が大きいと、該部分の温度上
昇を低く抑えることができ、電極先端部の難融性
金属や電極に塗布してあるエミツタ物質の蒸発飛
散を防ぎ、寿命期間中のランプの黒化を減少させ
ることができるが、通常電極足部にはモリブデン
の薄い箔を溶接して、外部導入線としているた
め、電流が大きくなると、電極足部の溶接部のモ
リブデン箔が溶断したり、発光管の封緘部にクラ
ツクが生じ、ランプの点灯寿命が短かくなる等の
欠点があつた。このため、電極足部の溶接部の形
状はモリブデン箔との溶接を強化するため、難融
性金属棒からなる足部を研削または、圧延等によ
り偏平加工を施したり、モリブデン箔を厚くした
り、あるいは、薄い白金箔を挿入して溶接するな
どの改善策が提案されたが、メタルハライドラン
プ等に用いる電極は偏平加工のみでは封着部への
ハロゲン化物の侵入、腐蝕に基づく溶接部の断線
または断線直前の加熱によるクラツク等を防止る
のに限界があり、また白金箔は、ハロゲン化物の
腐蝕を受け、溶接部強化のための効果はない。 Conventionally, electrodes for this type of discharge lamp have been used by winding a coil around a refractory metal rod with a small diameter when the lamp current is small, and when the current is large, the diameter of the refractory metal rod is Make it bigger or
As shown in Fig. 1, an electrode core 1 made of tungsten or the like has a large diameter portion 1' at the tip and an electrode leg 1'' which is rolled flat for welding to molybdenum foil at the other end. , an electrode is used which consists of two outer layers of coils 2 and 3 made of tungsten or the like wound around the outer circumference of the electrode core.When the lamp current is large, the diameter of the tip of the electrode becomes large. In addition, if the heat capacity is large, the temperature rise in the area can be kept low, preventing the evaporation and scattering of the refractory metal at the tip of the electrode and the emitter material coated on the electrode, and preventing blackening of the lamp during its life. However, since a thin molybdenum foil is usually welded to the electrode foot and used as an external lead-in wire, if the current increases, the molybdenum foil at the welded part of the electrode foot may melt or damage the arc tube. There were drawbacks such as cracks occurring in the sealing part and shortening the lighting life of the lamp.For this reason, the shape of the welded part of the electrode foot was changed to a refractory metal rod to strengthen the welding with the molybdenum foil. Improvement measures have been proposed, such as flattening the foot part by grinding or rolling, making the molybdenum foil thicker, or inserting and welding a thin platinum foil. There is a limit to preventing the intrusion of halides into the sealing part, breaking of the welded part due to corrosion, or cracks due to heating immediately before breaking, etc. with only flattening of electrodes.Platinum foil also prevents corrosion of halides. It has no effect on strengthening the weld.
本考案の目的は、上述の如き欠点を除去し、大
電流に適した電極を提供するもので、ランプに組
込んで使用した場合、１０Ａ以上のランプ電流に
対して電極先端部の温度を低くおさえ、タングス
テンやエミツタの蒸発が少なく、この為長時間点
灯しても、ランプの黒化が少なく、またモリブデ
ン箔との接合点を少くとも２個所とすることによ
つて、接合部面積を従来品の1.5〜２倍とし、従
来の電極に位べ溶接部の耐久力が高い放電灯用電
極を得ることにある。 The purpose of this invention is to eliminate the above-mentioned drawbacks and provide an electrode suitable for large currents.When used in a lamp, the temperature of the electrode tip can be kept low for lamp currents of 10A or more. There is less evaporation of tungsten and emitters, so even if the lamp is lit for a long time, there is less blackening of the lamp.Also, by having at least two points of contact with the molybdenum foil, the area of the joint can be reduced compared to the conventional method. The object of the present invention is to obtain an electrode for a discharge lamp that is 1.5 to 2 times that of a conventional electrode and has a welded part with higher durability than conventional electrodes.
前記目的を達成するための本考案の要旨は、難
融性金属棒からなり、直径の異なる二つの部分を
備える電極先端部と、難融性金属線からなる二本
の足部より構成され、前記電極先端部の大径部は
一方の足部より延長された外巻コイルで固定さ
れ、小径部は他方の足部より延長され前記外巻コ
イルに囲繞された内巻コイルで固定された放電灯
用電極である。 The gist of the present invention for achieving the above object is that the electrode tip part is made of a refractory metal rod and has two parts with different diameters, and the two legs are made of a refractory metal wire, The large diameter part of the electrode tip is fixed by an outer coil extending from one leg, and the small diameter part is fixed by an inner coil extending from the other leg and surrounded by the outer coil. This is an electrode for electric lights.
次に図面に示した本考案の一実施例について説
明する。 Next, an embodiment of the present invention shown in the drawings will be described.
第２図および第３図において、４はタングステ
ン等の難融性金属棒からなる大・小二通りの異な
る直径をもつた電極先端部、５はタングステン等
の難融性金属線よりなり電極先端部４の小径部
４′を巻回固定した内巻コイルで、その一端はモ
リブデン箔と溶接するため、偏平加工された電極
足部６になつている。該内巻コイル５はエミツタ
ー物質の充填量を多くするため、芯線の外周にタ
ングステン等の細線を巻回し、二重コイルしてい
る。７は前記内巻コイルと同じくタングステン等
の難融性金属線よりなり、モリブデン箔と溶接す
るため偏平加工された電極足部８から延長された
外巻コイルで、内巻コイル５の外側を囲繞する様
に巻回され、且つ電極先端部４の大径部４″を巻
回固定している。尚、該外巻コイル７は電極先端
部の大径部４″と内巻コイル５を固定するため巻
き始め部と巻き終り部を各々カシメ加工してあ
る。また、第３図に示した如く偏平加工された二
本の電極足部６，８の中心軸は、同一平面になる
ように加工されている。 In Figures 2 and 3, numeral 4 is an electrode tip made of a refractory metal rod such as tungsten and has two different diameters, large and small, and 5 is an electrode tip made of a refractory metal wire such as tungsten. It is an inner-wound coil in which the small diameter part 4' of the part 4 is wound and fixed, and one end of the coil is formed into a flattened electrode leg part 6 for welding to molybdenum foil. In order to increase the amount of emitter material filled in the inner coil 5, a fine wire such as tungsten is wound around the outer periphery of the core wire to form a double coil. Reference numeral 7 denotes an outer coil made of a refractory metal wire such as tungsten, similar to the inner coil, extending from the flattened electrode leg 8 for welding to molybdenum foil, and surrounding the outer side of the inner coil 5. The large diameter portion 4'' of the electrode tip 4 is wound and fixed.The outer coil 7 fixes the large diameter portion 4'' of the electrode tip and the inner coil 5. To prevent this, the beginning and end of the winding are crimped. Further, as shown in FIG. 3, the central axes of the two flattened electrode legs 6 and 8 are machined to be on the same plane.
上記実施例において、電極先端部４は大径部の
直径が２mm、長さ５mm、小径部の直径1.0mm、長
さ５mmのタングステン棒からなり、外巻コイル７
は、直径1.0mmのタングステン線からなり、電極
足部８は0.5mmの厚さに圧延偏平加工が施してあ
る。また、内巻コイル５は直径0.5mmのタングス
テン線よりなる一次巻線の外周に直径0.15mmのタ
ングステン線よりなる二次巻線が巻回されてお
り、一次巻線が延長された電極足部６は厚さ0.25
mmに圧延偏平加工されている。また、内巻コイル
の二重巻線部分には酸化トリウム等がエミツタ
（電子放射性物質）として塗布あるいは、含浸さ
れている。尚、第１図に示した従来の電極におい
て、電極々芯１の先端部１′は直径2.0mm、長さ５
mm、これに続く部分は直径１mmに形成したタング
ステン棒よりなり、内巻コイル２は直径0.5mmの
タングステン線を一次巻線とし、その外周に直径
0.15mmのタングステン線を二次巻線として巻回し
ている。更に、外巻コイル３は直径1.0mmのタン
グステン線を巻回して形成し、電極々芯１の一端
に形成された電極足部１″は厚さ0.5mmまで圧延偏
平加工されている。内巻コイルにエミツタが塗布
あるいは含浸されているのは上記本考案の実施例
と同じである。 In the above embodiment, the electrode tip 4 is made of a tungsten rod with a large diameter part of 2 mm in diameter and a length of 5 mm, and a small diameter part of 1.0 mm in diameter and 5 mm in length.
is made of a tungsten wire with a diameter of 1.0 mm, and the electrode foot 8 is rolled flat to a thickness of 0.5 mm. In addition, the inner coil 5 has a primary winding made of a tungsten wire with a diameter of 0.5 mm, and a secondary winding made of a tungsten wire with a diameter of 0.15 mm wound around the outer periphery, and an electrode foot where the primary winding is extended. 6 is thickness 0.25
Rolled and flattened to mm. Further, the double winding portion of the inner coil is coated with or impregnated with thorium oxide or the like as an emitter (electron radioactive substance). In the conventional electrode shown in Fig. 1, the tip 1' of the electrode core 1 has a diameter of 2.0 mm and a length of 5 mm.
mm, the part following this is made of a tungsten rod formed to a diameter of 1 mm, and the inner coil 2 uses a tungsten wire with a diameter of 0.5 mm as the primary winding, and the outer circumference has a diameter of 1 mm.
A 0.15mm tungsten wire is wound as the secondary winding. Further, the outer coil 3 is formed by winding a tungsten wire with a diameter of 1.0 mm, and the electrode foot 1'' formed at one end of the electrode core 1 is rolled and flattened to a thickness of 0.5 mm. The coil is coated or impregnated with emitters as in the above-mentioned embodiments of the present invention.
上述した本考案の実施例に示した電極と、従来
の電極を用い、ガリウムと沃素を封入した発光管
内径15mm、電極間長50mmのメタルハライドランプ
をランプ電力1500W、ランプ電圧90V、ランプ電
流18.5A、始動時電流25A8分間点灯後、８分間消
灯の反復点灯試験をそれぞれ数10灯について行な
つたところ、本考案実施例の電極をもつメタルハ
ライドランプは大部分が5000回以上の反復点灯試
験に耐えたが、第１図に示した従来の電極をもつ
メタルハライドランプは全数3000回以内の反復点
灯試験で封緘部にクラツクが生じた。 Using the electrodes shown in the embodiments of the present invention described above and conventional electrodes, a metal halide lamp containing gallium and iodine, an arc tube inner diameter of 15 mm, and a distance between electrodes of 50 mm was constructed with a lamp power of 1500 W, a lamp voltage of 90 V, and a lamp current of 18.5 A. When several dozen lamps were repeatedly lit at a starting current of 25 A for 8 minutes and then turned off for 8 minutes, most of the metal halide lamps with electrodes according to the embodiment of the present invention withstood repeated lighting tests of 5,000 times or more. However, in the metal halide lamp with the conventional electrode shown in Figure 1, cracks occurred in the sealed part after repeated lighting tests of up to 3,000 times.
尚、前記実施例では、二本の電極足部の一方を
他方より細くしているため、従来品のほゞ1.5倍
の電流に耐えることができたが、二本の足部の直
径を同じにすれば、約２倍の電流に耐えることが
できる。また、前記の一実施例では、エミツタを
充填した内巻コイルが始動時にイオン衝撃を受け
る電極の先端から離れて配置され、始動時に特に
大きい電極スパツタによる黒化も少くすることが
出来る利点を有する。 In the above example, one of the two electrode legs was made thinner than the other, so it was able to withstand approximately 1.5 times the current of the conventional product, but if the two legs had the same diameter, If you do so, you can withstand about twice as much current. Furthermore, in the above-mentioned embodiment, the inner-wound coil filled with emitters is placed away from the tip of the electrode that receives ion bombardment during startup, which has the advantage of reducing blackening caused by particularly large electrode spatter during startup. .
本考案は上述した如き構成を有するものであ
り、大電流放電灯用電極として特性が優れ、電極
と導入モリブデン箔との接続が簡単で、導入箔と
の接合点が二箇所あるため、従来の1.5〜2.0倍以
上の電流に耐え、同一電流に対して従来の1.5〜
2.0倍以上の封緘部の耐久寿命が得られる。更
に、本考案電極では電極足部の直径とは関係なく
電極先端部直径を大きくすることが出来るので、
ランプが長寿命となり且つ製品のバラツキも少な
く特性の安定したランプが得られる。 The present invention has the above-mentioned configuration, and has excellent characteristics as an electrode for large current discharge lamps.The electrode and the introduction molybdenum foil can be easily connected, and there are two points of contact with the introduction foil, so it is better than the conventional electrode. Withstands 1.5~2.0 times more current than conventional 1.5~2.0 times for the same current
The durable life of the sealed part can be increased by more than 2.0 times. Furthermore, with the electrode of the present invention, the diameter of the electrode tip can be increased regardless of the diameter of the electrode foot.
It is possible to obtain a lamp with a long life, less variation in products, and stable characteristics.
第１図は従来の放電灯用電極の断面図、第２図
は本考案放電灯用電極の正面断面図、第３図は同
じく本考案放電灯用電極の側面図である。
４……電極先端部、５……内巻コイル、６……
電極足部、７……外巻コイル、８……電極足部。
FIG. 1 is a sectional view of a conventional discharge lamp electrode, FIG. 2 is a front sectional view of the discharge lamp electrode of the present invention, and FIG. 3 is a side view of the discharge lamp electrode of the present invention. 4... Electrode tip, 5... Inner coil, 6...
Electrode leg, 7... Outer coil, 8... Electrode leg.
Claims (1)
える電極先端部と、前記電極先端部の小径部に巻
回固定された難融性金属線から成る内巻コイルの
一端を延長して第１の溶接端を形成した第１の電
極足部と、前記電極先端部の大径部に巻回固定さ
れ、かつ前記内巻コイルの外周を覆つた難融性金
属線から成る外巻コイルの一端を延長して第２の
溶接端を形成した第２の電極足部より構成された
放電灯用電極。 A first end is formed by extending one end of an inner-wound coil consisting of an electrode tip made of a refractory metal rod and having two large and small diameter portions, and a refractory metal wire wound and fixed to the small diameter portion of the electrode tip. a first electrode foot forming a welded end; and one end of an outer coil made of a refractory metal wire wound and fixed around the large diameter portion of the electrode tip and covering the outer periphery of the inner coil. An electrode for a discharge lamp comprising a second electrode foot portion which is extended to form a second welded end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976036085U JPS6235254Y2 (en) | 1976-03-24 | 1976-03-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976036085U JPS6235254Y2 (en) | 1976-03-24 | 1976-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52126682U JPS52126682U (en) | 1977-09-27 |
| JPS6235254Y2 true JPS6235254Y2 (en) | 1987-09-08 |
Family
ID=28495398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976036085U Expired JPS6235254Y2 (en) | 1976-03-24 | 1976-03-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6235254Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492898A (en) * | 1972-04-21 | 1974-01-11 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416556Y2 (en) * | 1973-08-31 | 1979-06-28 | ||
| JPS50125278U (en) * | 1974-03-29 | 1975-10-14 |
-
1976
- 1976-03-24 JP JP1976036085U patent/JPS6235254Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492898A (en) * | 1972-04-21 | 1974-01-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52126682U (en) | 1977-09-27 |
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