JPH1055757A - Manufacture of discharge lamp - Google Patents
Manufacture of discharge lampInfo
- Publication number
- JPH1055757A JPH1055757A JP8224630A JP22463096A JPH1055757A JP H1055757 A JPH1055757 A JP H1055757A JP 8224630 A JP8224630 A JP 8224630A JP 22463096 A JP22463096 A JP 22463096A JP H1055757 A JPH1055757 A JP H1055757A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- electrodes
- tip
- cathode
- arc tube
- 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
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- Discharge Lamp (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、発光管内に一対
の電極を対向して具えたショートアーク放電ランプの製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a short arc discharge lamp having a pair of electrodes opposed to each other in an arc tube.
【０００２】[0002]
【従来の技術】一般照明、工業用内視鏡、オーバーヘッ
ドプロジェクター、液晶バックライトの光源として、放
電ランプの一種であるメタルハライドランプが使われて
いる。そして、必要に応じて、ダブルエンド型メタルハ
ライドランプ、シングルエンド型メタルハライドランプ
のように種々の用途によって使い分けられている。これ
らランプのシール方法としては一般に、モリブデン箔を
用いた箔シール方法が多用されている。更に、箔シール
方法の中でも圧着プレスなどで機械的にシールする圧着
（ピンチ）シール方式とシュリンク方式（旋盤による手
作業シール）とがある。2. Description of the Related Art A metal halide lamp, which is a kind of discharge lamp, is used as a light source for general lighting, industrial endoscopes, overhead projectors, and liquid crystal backlights. And, as required, they are properly used for various purposes such as a double-ended metal halide lamp and a single-ended metal halide lamp. Generally, a foil sealing method using molybdenum foil is often used as a method for sealing these lamps. Further, among the foil sealing methods, there are a pressure bonding (pinch) sealing method of mechanically sealing with a pressure bonding press or the like and a shrinking method (manual sealing with a lathe).
【０００３】初めに、図３を用いて、箔シールを用いた
従来のダブルエンド型直流メタルハライドランプの製造
方法について説明する。 〔電極加工工程〕定格寸法の一対の電極（この場合は陽
極と陰極）をそれぞれ旋盤にて、先端加工、胴部加工及
び、モリブデン箔溶接部の平面加工などを行う。図中１
０は陽極、２０は陰極であり、１１、２１は陽極、陰極
のそれぞれの先端を加工した先端加工部、１２、２２は
陽極、陰極のそれぞれの胴部、１３、２３は陽極、陰極
のそれぞれの後端の平面加工部を示す。外径サイズは、
陽極の方が陰極より大きくなる事が一般的に知られてお
り、また、陽極、陰極の材質はタングステン又は電子放
射性の良いトリウム入りタングステンが使用される事も
よく知られている。First, a method of manufacturing a conventional double-ended DC metal halide lamp using a foil seal will be described with reference to FIG. [Electrode processing step] A pair of electrodes (in this case, an anode and a cathode) having a rated size are subjected to tip processing, body processing, and plane processing of a molybdenum foil welded part using a lathe. 1 in the figure
Reference numeral 0 denotes an anode, reference numeral 20 denotes a cathode, reference numerals 11 and 21 denote processed end portions of the anode and the cathode, reference numerals 12 and 22 denote anode and cathode body portions, and reference numerals 13 and 23 denote an anode and a cathode, respectively. 4 shows a flattened portion at the rear end of FIG. The outer diameter size is
It is generally known that the anode is larger than the cathode, and it is also well known that the material of the anode and the cathode is tungsten or tungsten containing thorium having a good electron emission property.
【０００４】必要に応じて陰極外周の胴部２２には外径
０．２〜０．８ｍｍ程度のタングステンによる細いワイ
ヤーをコイル状に巻いたものを装着する時もある。図中
２４が装着状態の陰極コイル部である。この陰極コイル
部２４は、点灯時の陰極の温度勾配を適正にする働きを
する。[0004] If necessary, a thin wire of tungsten having an outer diameter of about 0.2 to 0.8 mm wound in a coil shape may be attached to the body 22 on the outer periphery of the cathode. In the figure, reference numeral 24 denotes a mounted cathode coil unit. The cathode coil section 24 functions to make the temperature gradient of the cathode at the time of lighting appropriate.
【０００５】〔マウント組立工程〕定格寸法に切断した
モリブデン箔３の一端にモリブデン棒、又は、タングス
テン棒よりなる外部リード４を溶接し、他端に陽極１
０、陰極２０をそれぞれ溶接する。なお、陽極１０又は
陰極２０、モリブデン箔３、外部リード棒４よりなる組
立体をマウントと呼ぶ。図中、Ａ２、Ｂ２はそれぞれ陽
極側、陰極側のマウントを示す。[Mount assembling process] An external lead 4 made of a molybdenum rod or a tungsten rod is welded to one end of a molybdenum foil 3 cut to a rated size, and an anode 1 is attached to the other end.
0 and the cathode 20 are each welded. Note that an assembly including the anode 10 or the cathode 20, the molybdenum foil 3, and the external lead rod 4 is called a mount. In the figure, A2 and B2 denote mounts on the anode side and the cathode side, respectively.
【０００６】〔発光管製作工程〕石英ガラスからなる発
光管５は、内容積が一定になるように肉厚測定を行い、
発光管外径の形状は割型成型などで形成する。更に、発
光管の両端には後工程でマウントＡ２、Ｂ２を挿入し、
モリブデン箔３を封止（シール）するための石英ガラス
製のサイド管５１及び５２を形成する[Light Emitting Tube Fabrication Process] The thickness of the light emitting tube 5 made of quartz glass is measured so that the internal volume is constant.
The shape of the outer diameter of the arc tube is formed by split molding or the like. Further, mounts A2 and B2 are inserted into both ends of the arc tube in a later step,
Forming quartz glass side tubes 51 and 52 for sealing the molybdenum foil 3
【０００７】その後、発光管５のほぼ中央部に両端が開
口した排気管６を形成する。この排気管６は、後で述べ
る〔シール工程〕や〔封入封止工程〕において、発光管
５内の排気や封入物の封入の際の通路としての役割を果
たす。[0007] Thereafter, an exhaust pipe 6 having both ends opened substantially at the center of the arc tube 5 is formed. The exhaust pipe 6 serves as a passage for exhausting the inside of the arc tube 5 and enclosing the enclosure in a [sealing step] or [enclosure sealing step] described later.
【０００８】〔マウント挿入工程〕発光管５のサイド管
５１、５２からそれぞれマウントＡ２、Ｂ２を挿入し
て、発光管５中で両電極１０、２０の先端が所望の距離
（すなわち電極間距離）になるように配置する。図中Ａ
Ｌが電極間距離を示す。[Mount Insertion Step] The mounts A2 and B2 are inserted from the side tubes 51 and 52 of the arc tube 5, respectively, so that the tips of the electrodes 10 and 20 in the arc tube 5 have a desired distance (ie, the distance between the electrodes). Arrange so that A in the figure
L indicates the distance between the electrodes.
【０００９】〔シール工程〕 （ピンチシール方法） 排気管６の開口から不活性ガス（Ｎ2 ）を発光管５に封
入しながら、水素などのガスバーナー等（図示せず）で
発光管５のサイド管５１及び５２を均等に熱し、機械的
にピンチシールする。図示を省略するが、このピンチシ
ールは２つの金型（ピンチャーと呼ぶ）が高温になった
サイド管５１、５２と、モリブデン箔３を両側から抱く
ようにして瞬時にシールを行うものである。 （旋盤を用いた手作業シール方法） まず排気管６の先端開口から発光管５内を真空排気した
後、排気管６の先端部を水素炎などを当てて封止する。
さらに、発光管５を回転させながら、サイド管５１、５
２内のモリブデン箔３が存在する部分を、外部から熱を
均等に加えながらシールする。この時、常に電極間距離
ＡＬと両電極１０、２０の軸偏心を監視しながら調節を
行いシールを完成する。[Sealing Step] (Pinch Sealing Method) While the inert gas (N 2 ) is sealed in the arc tube 5 from the opening of the exhaust tube 6, the arc tube 5 is sealed with a gas burner such as hydrogen (not shown). The side tubes 51 and 52 are evenly heated and mechanically pinch-sealed. Although not shown, this pinch seal performs instantaneous sealing by holding the side tubes 51 and 52 and the molybdenum foil 3 from both sides where two molds (called pinchers) have become hot. (Manual Sealing Method Using Lathe) First, the inside of the arc tube 5 is evacuated from the tip opening of the exhaust pipe 6, and then the tip of the exhaust pipe 6 is sealed with a hydrogen flame or the like.
Further, while rotating the arc tube 5, the side tubes 51, 5
The portion where the molybdenum foil 3 exists in 2 is sealed while uniformly applying heat from the outside. At this time, the seal is completed by adjusting while always monitoring the distance AL between the electrodes and the axial eccentricity of the electrodes 10 and 20.
【００１０】〔封入封止工程〕手作業シール方法では排
気管６の先端部がシール工程にて封止されているため、
再び、排気管６の先端部をカットして口を開く。排気管
６の先端開口より発光管５内に所定量のペレット状のハ
ロゲン化合物８、例えば、ＳｎＩ2 や所定量の水銀９を
封入する。さらに、排気管６の先端を排気台に接続して
排気を行う。そして、最後に、希ガスとしてアルゴン、
キセノン等を数千Ｐａから数万Ｐａ封入して、排気管６
の先端部を封止する。このようにして、ダブルエンド型
直流メタルハライドランプが完成する。[Enclosure Sealing Step] In the manual sealing method, the tip of the exhaust pipe 6 is sealed in the sealing step.
Again, the end of the exhaust pipe 6 is cut and the mouth is opened. A predetermined amount of a halogen compound 8 in the form of a pellet, for example, SnI 2 or a predetermined amount of mercury 9 is sealed in the arc tube 5 from the opening at the tip of the exhaust tube 6. Further, the distal end of the exhaust pipe 6 is connected to an exhaust table to perform exhaust. And finally, argon as a rare gas,
Xenon or the like is filled in from several thousand Pa to several tens of thousands Pa, and the exhaust pipe 6
Seal the tip of. In this way, a double-ended DC metal halide lamp is completed.
【００１１】[0011]
【発明が解決しようとする課題】しかしながら、従来の
ダブルエンド型直流メタルハライドランプの製造方法に
おいて、以下のような問題があった。ダブルエンド型直
流メタルハライドランプの旋盤を用いた手作業シール工
程においては、大きさの異なる陽極と陰極とを３次元の
空間で所望の電極間距離と中心軸を合わすために、その
調整を手作業で行いながら、発光管の両端をシールして
いた。これは、かなり熟練を要する作業であり、作業者
に過重な負担を強いることになる。また、ピンチシール
のような機械的なシールでは、シールする時に電極の位
置が動きやすいために電極間距離を一定にする事は更に
困難な作業になり、電極間距離の小さいショートアーク
放電ランプになると、僅かのバラツキでも、電極間距離
規格値に対する変動比率は大きくなる傾向にある。例え
ば、バラツキが０．５ｍｍの場合、電極間距離５ｍｍの
ランプでの変動比率は１０％であるが、電極間距離２ｍ
ｍのランプでは２５％以上になる。このため、従来の製
造方法によるダブルエンド型直流メタルハライドランプ
では、各ランプの電極間距離や軸偏心などのバラツキが
大きく、光学特性や電気特性のバラツキも大きくなると
いう難点があった。However, the conventional method of manufacturing a double-ended DC metal halide lamp has the following problems. In the manual sealing process using a lathe of a double-ended DC metal halide lamp, manual adjustment of the anode and cathode of different sizes in order to match the desired electrode distance and center axis in a three-dimensional space While sealing both ends of the arc tube. This is a task that requires considerable skill and places an excessive burden on the operator. Also, in the case of a mechanical seal such as a pinch seal, it is more difficult to keep the distance between the electrodes constant because the position of the electrodes is easy to move during sealing. Then, the variation ratio with respect to the inter-electrode distance standard value tends to increase even with a slight variation. For example, when the variation is 0.5 mm, the variation ratio of a lamp having a distance of 5 mm between the electrodes is 10%, but the distance between the electrodes is 2 m.
With a lamp of m, it becomes 25% or more. For this reason, the double-ended DC metal halide lamp manufactured by the conventional manufacturing method has a problem that variations in distance between electrodes of each lamp and axial eccentricity are large, and variations in optical characteristics and electric characteristics are also large.
【００１２】本発明は、以上のような事情に鑑みてなさ
れたものであって、その目的とする所は、簡単な工程で
高い精度の電極間距離と軸中心を備えるショートアーク
放電ランプを製造し、特性上もバラツキの少ない放電ラ
ンプを提供することである。The present invention has been made in view of the above circumstances, and an object of the present invention is to manufacture a short arc discharge lamp having a highly accurate distance between electrodes and an axial center in a simple process. Another object of the present invention is to provide a discharge lamp having less variation in characteristics.
【００１３】[0013]
【課題を解決するための手段】上記課題を解決するため
に、請求項１に記載の放電ランプの製造方法は、一対の
電極の一方の先端面に、対向する他方の電極を軸中心に
案内する案内部を設け、該他方の電極の先端面に、該案
内部に当接する形状の先端部を形成する電極加工工程
と、完成した電極間に所望の電極間距離を確保すべく、
少なくとも何れか一方の電極側に破断部を形成する破断
部形成工程と、前記一方の電極の案内部に他方の電極先
端部を軸中心に当接させた状態で発光管の両側を封止す
るシール工程と、その後に、前記発光管に形成されてい
る前記排気管の先端開口から破断棒を挿入し、前記電極
部材の破断部を破断させて切り離すことによって、発光
管中に所望の距離に離間した一対の電極を形成する破断
工程と、該破断工程において破断した破片を前記排気管
より取り出す破片排出工程とを含むことを特徴とする。According to a first aspect of the present invention, there is provided a method of manufacturing a discharge lamp, wherein one of a pair of electrodes is guided to one end face and the other electrode is opposed to an axis. An electrode processing step of forming a tip portion having a shape contacting the guide portion on the tip surface of the other electrode, in order to secure a desired inter-electrode distance between the completed electrodes,
A breaking portion forming step of forming a breaking portion on at least one of the electrode sides, and sealing both sides of the arc tube in a state where the tip of the other electrode is in contact with the guide portion of the one electrode around the axis. A sealing step, and thereafter, a breaking rod is inserted from a tip opening of the exhaust pipe formed in the arc tube, and a broken portion of the electrode member is cut and separated to a desired distance in the arc tube. The method includes a breaking step of forming a pair of electrodes separated from each other, and a debris discharging step of taking out fragments broken in the breaking step from the exhaust pipe.
【００１４】請求項２の発明は、請求項１の発明におい
て、特に、電極加工工程の後に、一対の電極の先端面同
士を軸中心に当接させた状態で先端面同士を溶接して、
その後の破断部形成工程において所望の電極間距離を確
保すべく、前記溶接した箇所及びいずれか一方の電極側
の２箇所に破断部を形成することを特徴とする。According to a second aspect of the present invention, in the first aspect of the present invention, particularly, after the electrode processing step, the tip surfaces of the pair of electrodes are welded to each other in a state where the tip surfaces of the pair of electrodes are in contact with each other around the axis.
In order to secure a desired inter-electrode distance in a subsequent break portion forming step, break portions are formed at the welded portions and at two positions on one of the electrode sides.
【００１５】請求項３の発明は、請求項１の発明におい
て、特に、電極加工工程における一方の電極の案内部の
形状を凹状とし、該案内部に当接する他方の電極の先端
部の形状を凸状に形成するこを特徴とする。According to a third aspect of the present invention, in the first aspect of the present invention, in particular, the shape of the guide portion of one electrode in the electrode processing step is concave, and the shape of the tip of the other electrode abutting on the guide portion is changed. It is characterized by being formed in a convex shape.
【００１６】[0016]
【発明の実施の形態】図１は、この発明にかかる放電ラ
ンプの製造方法、特に、陽極と陰極を具備するダブルエ
ンド型直流メタルハライドランプの製造方法を例として
説明する。尚、説明の都合上、破断部を設ける側の電極
（この例では陰極側）の破断前の名称は陰極部材２と呼
び、破断後を陰極２０と呼ぶ。FIG. 1 illustrates a method for manufacturing a discharge lamp according to the present invention, in particular, a method for manufacturing a double-ended DC metal halide lamp having an anode and a cathode as an example. For convenience of explanation, the name of the electrode (the cathode side in this example) on the side where the break portion is provided before the break is called a cathode member 2 and the name after the break is called the cathode 20.
【００１７】〔工程１ 電極加工工程〕陽極１は、純タ
ングステン又はトリウム入りタングステンよりなり、先
端面には対向する陰極２０を軸中心に案内する案内部１
１Ａを設ける。案内部１１Ａの中心位置は陽極１の軸中
心に合致させ、その形状は本実施例のように平面でもよ
いが、更に確実にするために例えば、円錐穴、もしくは
ストレ−ト穴などの凹部を設けるのも良い。これはセン
タ−ドリルなどで切削加工して形成する。[Step 1 Electrode Processing Step] The anode 1 is made of pure tungsten or tungsten containing thorium, and a guide portion 1 for guiding the opposing cathode 20 about the axis at the tip end surface.
1A is provided. The center position of the guide 11A coincides with the axial center of the anode 1, and the shape may be flat as in the present embodiment, but for further assurance, for example, a concave portion such as a conical hole or a straight hole is provided. It is also good to provide. This is formed by cutting with a center drill or the like.
【００１８】陰極部材２は、純タングステン又はトリウ
ム入りタングステンよりなり、その先端部には陽極の先
端面に形成される案内部１１Ａに当接するように先端部
２５Ａの形状を形成する。この先端部２５Ａは陽極の案
内部１１Ａの形状が、例えば、平面の場合は平面にし、
凹部の場合は凸部を形成する。何れにしろ両電極の先端
面同士がピッタリ当接する形状に仕上げる。The cathode member 2 is made of pure tungsten or tungsten containing thorium, and has a tip portion 25A formed at the tip portion so as to abut on a guide portion 11A formed on the tip surface of the anode. The tip portion 25A has a flat shape when the shape of the guide portion 11A of the anode is, for example, flat.
In the case of a concave portion, a convex portion is formed. In any case, the electrodes are finished in such a shape that the tip surfaces of both electrodes come into perfect contact with each other.
【００１９】〔工程２ 破断部形成工程〕更に陰極部材
２の先端部１１Ａを定板ｂに当て、切削や研削などの方
法により陰極部材を削り込んだ破断部を設ける。この破
断部は図中で２５Ｂに示す。破断部２５Ｂの設定は、例
えば砥石ａと定板ｂとの間にスペーサｃを入れて、この
間が所望する電極間距離ＡＬになるように位置調整す
る。また、陽極１に形成される案内部１１Ａの形状を凹
状にした場合には、勿論、陽極１に形成される凹状案内
部１１Ａの深さ相当分を差し引いた値が、真の電極間距
離ＡＬになるようにスペ−サｃの厚みは調整しておく。[Step 2 Breaking part forming step] Further, a tip part 11A of the cathode member 2 is brought into contact with the surface plate b, and a breaking part in which the cathode member is cut by a method such as cutting or grinding is provided. This break is shown at 25B in the figure. The break portion 25B is set, for example, by inserting a spacer c between the grindstone a and the base plate b, and adjusting the position so that a desired inter-electrode distance AL is provided therebetween. When the shape of the guide 11A formed on the anode 1 is concave, the value obtained by subtracting the depth equivalent of the concave guide 11A formed on the anode 1 is, of course, the true inter-electrode distance AL. The thickness of the spacer c is adjusted so that
【００２０】このような陰極部材２を作成する事は、後
で述べるシ−ル工程中に電極間距離を一定に保持し、電
極を軸中心に固定する治具としての働きを備える事にな
る。更に、この切削加工の時に陰極の先端加工部２１の
作成も合わせて行っておく。破断部２５Ｂの切削の程度
は、後に述べる〔工程３〕から〔工程７〕の取扱い中に
は破断されない程度に、かつ〔工程８ 破断工程〕の時
には破断棒７で容易に破断できる程度に止めておく。
尚、破断部の加工は砥石の他に切削バイト、放電加工機
（いずれも図示せず）等で行う方法もある。The production of such a cathode member 2 has a function as a jig for keeping the distance between the electrodes constant during the sealing process described later and fixing the electrodes around the axis. . Further, at the time of this cutting process, the formation of the tip processing portion 21 of the cathode is also performed. The degree of cutting of the broken portion 25B is limited to such a degree that it is not broken during the handling of [Step 3] to [Step 7] to be described later, and to such a degree that it can be easily broken by the breaking bar 7 at [Step 8 breaking step]. Keep it.
In addition, there is a method of processing the broken portion by using a cutting tool, an electric discharge machine (both not shown), etc. in addition to the grindstone.
【００２１】〔工程３ 電極処理工程〕その後、加工さ
れた陽極１及び陰極部材２に電解研磨、洗浄を施す。さ
らに、真空加熱炉にてガス出しを行う。この時、先に切
削加工した陰極２の破断部２５Ｂが弱い再結晶をおこす
程度の温度と時間、例えば、１５００°Ｃで５分間程度
加熱する。再結晶は陰極部材２の破断部２５Ｂに例え
ば、レーザ光を照射することによっても起こすことがで
きる。レーザ光としては、炭酸ガスレーザ光，ＹＡＧレ
ーザ光等を用いる。図中、Ｌはレーザ発振装置を示す。
破断部２５Ｂに弱い再結晶をおこす事によって、若干脆
くなるために後述するように破断部２５Ｂの破断が容易
になる。[Step 3 Electrode Treatment Step] Thereafter, the processed anode 1 and cathode member 2 are subjected to electrolytic polishing and washing. Further, gas is discharged in a vacuum heating furnace. At this time, the cathode 2 is heated at a temperature and a time, for example, about 1500 ° C. for about 5 minutes so that the broken portion 25B of the cathode 2 which has been previously cut may cause weak recrystallization. Recrystallization can also be caused by, for example, irradiating the broken portion 25B of the cathode member 2 with a laser beam. As the laser light, a carbon dioxide laser light, a YAG laser light, or the like is used. In the figure, L indicates a laser oscillation device.
By causing weak recrystallization in the broken portion 25B, the broken portion 25B becomes slightly brittle, so that the broken portion 25B is easily broken as described later.
【００２２】〔工程４ マウント組立工程〕定格寸法に
切断したモリブデン箔３の一端にモリブデン棒、又は、
タングステン棒よりなる外部リード棒４を溶接し、他端
に電極処理を施した陽極１、陰極部材２の平面加工部１
３、２３をそれぞれ溶接する。なお、陽極１、陰極部材
２、モリブデン箔３、外部リード棒４よりなる組立体を
マウントと呼ぶ。図中、Ａ１、Ｂ１はそれぞれ陽極側、
陰極側のマウントを示す。[Step 4 Mount Assembling Step] A molybdenum rod or
An external lead rod 4 made of a tungsten rod is welded, and the other end is subjected to an electrode treatment.
3 and 23 are each welded. Note that an assembly including the anode 1, the cathode member 2, the molybdenum foil 3, and the external lead rod 4 is called a mount. In the figure, A1 and B1 are respectively the anode side,
The mount on the cathode side is shown.
【００２３】〔工程５ 発光管製作工程〕石英ガラスか
らなる発光管５は、内容積が一定になるように、肉厚測
定を行いながら、外径の形状は割型成型で形成する。こ
のとき、発光管５の両端のサイド管５１、５２の内径は
できる限り、電極となる陽極１、陰極部材２の外径に近
い寸法にそれぞれ仕上げる。その後、排気管６を発光管
の外周上に形成するが、ここで肝要な事は、排気管を形
成する位置は、シ−ルした状態で両電極が当接する先端
部１０Ａから破断部２５Ｂまでを臨む位置に形成してお
く事である。望ましくは、破断部が１箇所の場合は破断
部２５Ｂの近傍を、２箇所の場合は両破断部のほぼ中間
部を臨む位置に排気管６を形成する。その事により後の
〔工程８〕で、破断棒７を挿入して破断部２５Ｂを破断
させる作業が容易に行える。[Step 5 Arc Tube Fabrication Process] The arc tube 5 made of quartz glass is formed by split mold molding while measuring the thickness so that the inner volume is constant. At this time, the inner diameters of the side tubes 51 and 52 at both ends of the arc tube 5 are finished as close as possible to the outer diameters of the anode 1 and the cathode member 2 serving as electrodes. After that, the exhaust pipe 6 is formed on the outer periphery of the arc tube. It is important to note that the position where the exhaust pipe is formed is from the distal end portion 10A where the two electrodes abut in a sealed state to the broken portion 25B. Is formed in a position facing the Desirably, the exhaust pipe 6 is formed at a position in the vicinity of the broken portion 25B when the number of the broken portions is one, and at a position almost in the middle of the two broken portions when the number of the broken portions is two. This makes it easier to insert the breaking bar 7 and break the broken portion 25B in [Step 8].
【００２４】〔工程６ マウント挿入工程〕発光管５の
サイド管５１、５２からそれぞれマウントＡ１、Ｂ１を
挿入する。この時、陽極先端部の案内部１１Ａに陰極部
材の先端部２５Ａを当接させる。[Step 6 Mount Insertion Step] The mounts A1 and B1 are inserted from the side tubes 51 and 52 of the arc tube 5, respectively. At this time, the tip 25A of the cathode member is brought into contact with the guide 11A at the tip of the anode.
【００２５】〔工程７ シール工程〕 （ピンチシール方法） 発光管５に形成されている排気管６から不活性ガス（Ｎ
2 ）を発光管５に封入しながら、マウントＡ１、Ｂ１の
モリブデン箔３と封体５のサイド管部５１、５２を機械
的にピンチシールする。 （旋盤を用いた手作業シール方法） 発光管５のサイド管５１、５２の両端を水素炎などで封
止する。次に、排気管６から発光管５内を真空排気し
て、その後、排気管６を封止する。さらに、発光管５を
回転させながら、マウントＡ１、Ｂ１のモリブデン箔３
と封体５のサイド管５１、５２を外から熱を加えてシー
ルする。、いずれのシ−ル方法の時でも、陽極先端
の案内部１１Ａに陰極部材の先端部２５Ａを当接させた
状態でシ−ルする。この事により電極間距離を一定にで
き、偏芯調整も容易に行える。[Step 7 Sealing Step] (Pinch Sealing Method) Inert gas (N
2 ) The molybdenum foil 3 of the mounts A1 and B1 and the side tube portions 51 and 52 of the sealing body 5 are mechanically pinch-sealed while the light emitting tube 5 is sealed. (Manual sealing method using a lathe) Both ends of the side tubes 51 and 52 of the arc tube 5 are sealed with a hydrogen flame or the like. Next, the inside of the light emitting tube 5 is evacuated from the exhaust pipe 6 and then the exhaust pipe 6 is sealed. Further, while rotating the arc tube 5, the molybdenum foil 3 of the mounts A1 and B1 is rotated.
And the side tubes 51 and 52 of the sealing body 5 are sealed by applying heat from outside. In any of the sealing methods, the sealing is performed in a state in which the tip portion 25A of the cathode member is in contact with the guide portion 11A at the tip of the anode. As a result, the distance between the electrodes can be made constant, and the eccentricity can be easily adjusted.
【００２６】〔工程８ 破断工程〕ピンチシールを施さ
れた発光管の場合は、発光管５に形成されている排気管
６の開口先端より破断棒７を挿入して、破断部２５Ｂを
破断させる。一方、旋盤を用いた手作業シールを施され
た発光管の場合は、まず封止されている排気管６の先端
を開く。次に、破断棒７を排気管６から発光管５内に挿
入して破断部２５Ｂを破断させる。破断部には先の〔工
程３〕で弱い再結晶を起こす程度に加熱処理がなされて
いるので、この破断部２５Ｂの破断は容易に行える。こ
の破断によって、発光管５内に所望の電極間距離ＡＬに
離間した一対の電極が完成することになる。[Step 8 Breaking Step] In the case of the arc tube provided with the pinch seal, the breaking bar 7 is inserted from the opening end of the exhaust pipe 6 formed in the arc tube 5 to break the breaking portion 25B. . On the other hand, in the case of an arc tube to which a manual seal using a lathe is applied, first, the end of the sealed exhaust tube 6 is opened. Next, the breaking bar 7 is inserted from the exhaust pipe 6 into the arc tube 5 to break the breaking portion 25B. Since the broken portion has been subjected to a heat treatment to such an extent as to cause weak recrystallization in [Step 3], the broken portion 25B can be easily broken. By this break, a pair of electrodes separated by a desired inter-electrode distance AL in the arc tube 5 is completed.
【００２７】〔工程９ 破片排出工程〕さらに、破断に
より陰極部材２から切り離された破断破片２５を排気管
６を通して、発光管５の外に排出する。[Step 9: Debris Discharging Step] Further, the broken fragments 25 cut off from the cathode member 2 by breaking are discharged through the exhaust pipe 6 to the outside of the arc tube 5.
【００２８】〔工程１０ 封入封止工程〕開口している
排気管６の先端より、発光管内にペレット状のハロゲン
化合物８、例えば、ＳｎＩ2 及び所定量の水銀９を発光
管５内に封入する。次いで、排気管６の先端を排気台に
接続して排気を行う。そして、最後に、希ガスとしてア
ルゴン、キセノン等を数千Ｐａから数万Ｐａ封入して、
排気管６を封止する。[Step 10 Encapsulation and Sealing Step] A halogen compound 8 in the form of a pellet, for example, SnI 2 and a predetermined amount of mercury 9 are sealed in the arc tube 5 from the open end of the exhaust tube 6. . Next, the distal end of the exhaust pipe 6 is connected to an exhaust table to perform exhaust. And finally, as a rare gas, argon, xenon, etc. are filled in from several thousand Pa to several tens of thousands Pa,
The exhaust pipe 6 is sealed.
【００２９】以上のように、図１では陽極の案内部１１
Ａと陰極の先端部２５Ａを平面にし、陰極側に破断部を
設けた実施例を示したが、図２には本発明にかかる他の
実施例、特に両電極の先端面の形状又は破断箇所を変え
た他の実施例を示す。（イ）は両電極の平面状の先端面
同士を溶接によって一体に接続し、切削による破断箇所
を接続部と陰極側の２ヵ所に設けた例、（ロ）は陽極先
端面に凹状の案内部、陰極部材に凸状の先端部を設け、
破断箇所を陰極側の１ヵ所に設けた例、（ハ）は凹状の
案内部及び破断箇所をいずれも陽極側に設けた例をそれ
ぞれ図示している。As described above, in FIG.
A shows an embodiment in which the tip A of the cathode and the tip portion 25A of the cathode are flat and a break portion is provided on the cathode side. FIG. 2 shows another embodiment according to the present invention, particularly the shape of the tip surfaces of the two electrodes or the location of the break. Another embodiment in which is changed is shown. (A) is an example in which the flat end surfaces of both electrodes are integrally connected by welding, and the break point by cutting is provided in two places on the connection part and the cathode side. (B) is a concave guide on the anode end surface. Section, the cathode member is provided with a convex tip,
(C) shows an example in which a broken portion is provided at one position on the cathode side, and (C) shows an example in which both a concave guide portion and a broken portion are provided on the anode side.
【００３０】図２（イ）に示すように、陽極１の案内部
１１Ａと陰極部材２の先端面２５Ａを当接させ、突き合
わせ抵抗溶接（バット溶接）などを行って一体に接続し
た場合には、この破断部は２箇所に設けることになる。
破断部の位置は任意の２箇所でも良いが、切削加工の容
易さなどから実用的には、この溶接を行った箇所（接続
部）及びここを基準にして所望の電極間距離を確保する
位置の電極側（この場合は陰極部材２）の２箇所に設け
ると良い。両電極を接続して一体にすることにより、そ
の後の工程での取扱いが容易になり、加工精度も更に向
上する。特に、両電極のサイズに大きな差がある場合
や、陽極の先端面を平面にする制限がある場合には一層
の効果を奏する。As shown in FIG. 2A, when the guide portion 11A of the anode 1 is brought into contact with the distal end surface 25A of the cathode member 2 and they are integrally connected by butt resistance welding (butt welding) or the like. This break portion is provided at two places.
Although the position of the broken portion may be any two positions, practically, for ease of cutting and the like, the position where the welding is performed (connecting portion) and a position where a desired inter-electrode distance is secured based on this position. It is good to provide at two places on the electrode side (the cathode member 2 in this case). By connecting the two electrodes and integrating them, handling in the subsequent steps is facilitated, and the processing accuracy is further improved. In particular, when there is a large difference between the sizes of the two electrodes or when there is a restriction that the front end surface of the anode is flat, the effect is further enhanced.
【００３１】図２（ロ）に示すように、陽極１に形成さ
れる案内部１１Ａに凹部を設けた場合には、陰極部材の
先端部２５Ａは凸状に形成する。そして図１の〔工程
２〕のように電極間距離を確保する時には、陽極１に形
成される凹部の深さ相当分を差し引いた値が、真の電極
間距離ＡＬになるようにスペ−サｃの厚みを調整して切
削する事が肝要である。As shown in FIG. 2B, when a concave portion is provided in the guide portion 11A formed on the anode 1, the distal end portion 25A of the cathode member is formed in a convex shape. When the inter-electrode distance is secured as in [Step 2] of FIG. 1, the value obtained by subtracting the depth corresponding to the depth of the concave portion formed in the anode 1 becomes the true inter-electrode distance AL. It is important to adjust the thickness of c and cut.
【００３２】以上の実施例では、いずれも外径の小さい
方の陰極側を切削して破断部を設ける前提で説明した
が、図２の（ハ）に示すように陽極側に設けても良い。
その場合には、〔工程９〕で破断後の破片を排気管６の
開口から除去する必要上、陽極側の破断部から先の外径
全体を、この排気管６の内径より小さくなるように削り
込んでおくことが必要である。In each of the above embodiments, it has been described on the assumption that the cathode having the smaller outer diameter is cut to provide a broken portion, but it may be provided on the anode as shown in FIG. .
In this case, it is necessary to remove the broken pieces from the opening of the exhaust pipe 6 in [Step 9], so that the entire outer diameter beyond the broken portion on the anode side is smaller than the inner diameter of the exhaust pipe 6. It is necessary to cut it down.
【００３３】[0033]
【発明の効果】本発明による放電ランプでは、一方の電
極の先端面に、対向する電極を軸中心に案内する案内部
が設けられている。他方の電極の先端面には、案内部に
当接するような先端部を形成し、かつ所望の電極間距離
を確保する位置に切削などによる破断部が設けられてい
る。一方の電極の案内部に他方の電極の先端部を当接さ
せた状態でシ−ルするので、作業者は両電極の偏芯調整
が容易に行える。その上、一方の電極の先端面と他方の
電極に形成された破断部との距離が電極間距離になるた
め、常に電極間距離が一定になり、バラツキの少ない放
電ランプを製造する事が出来る。更に、電極の先端面同
士を溶接して一体に接続する事により、その後の工程で
の取扱いが容易になり、加工精度も更に向上する。特
に、両電極のサイズに大きな差がある場合に、より一層
の効果を奏する。本発明によれば、シール後に排気管よ
り金属製の破断棒を発光管内に挿入して、電極に形成さ
れている破断部を破断させる。すなわち、発光管内で所
望の電極間距離に離間した一対の電極の製造を完成させ
る。この時に、マウントは既にシールされて固定されて
いるため、破断棒によって破断部が破断されても構成し
ているマウントの位置が移動することがない。以上のよ
うに簡単な工程で、高精度の電極間距離及び軸中心を備
え、特性上も極めてバラツキの少ない放電ランプの製造
が可能になる。In the discharge lamp according to the present invention, a guide portion for guiding the opposing electrode around the axis is provided on the tip end surface of one of the electrodes. On the tip surface of the other electrode, a tip portion is formed so as to be in contact with the guide portion, and a break portion is provided at a position where a desired inter-electrode distance is secured by cutting or the like. Since the sealing is performed with the tip of the other electrode in contact with the guide portion of one electrode, the operator can easily adjust the eccentricity of both electrodes. In addition, since the distance between the tip surface of one electrode and the broken portion formed on the other electrode is the distance between the electrodes, the distance between the electrodes is always constant, and a discharge lamp with less variation can be manufactured. . Further, by connecting the tip surfaces of the electrodes together by welding, the handling in the subsequent process is facilitated, and the processing accuracy is further improved. In particular, when there is a large difference between the sizes of the two electrodes, a further effect is exhibited. According to the present invention, after sealing, a metal break rod is inserted into the arc tube from the exhaust pipe to break the break portion formed on the electrode. That is, the manufacture of a pair of electrodes separated by a desired distance between the electrodes in the arc tube is completed. At this time, since the mount is already sealed and fixed, the position of the mount does not move even if the breaking portion is broken by the breaking bar. As described above, with a simple process, it is possible to manufacture a discharge lamp having a highly accurate inter-electrode distance and an axial center and having extremely small variations in characteristics.
【図１】本発明にかかるダブルエンド型メタルハライド
ランプの製造方法を示す。FIG. 1 shows a method for manufacturing a double-ended metal halide lamp according to the present invention.
【図２】本発明にかかる他の実施例を示す。FIG. 2 shows another embodiment according to the present invention.
【図３】従来のダブルエンド型メタルハライドランプの
製造方法を示す。FIG. 3 shows a method for manufacturing a conventional double-ended metal halide lamp.
１、１０ 陽極 ２ 陰極部材 ３ モリブデン箔 ４ 外部リード棒 ５ 発光管 ５１ 陽極側サイド管 ５２ 陰極側サイド管 ６ 排気管 ７ 破断棒 ８ ハロゲン化合物 ９ 水銀 Ａ１、Ａ２ 陽極側マウント Ｂ１、Ｂ２ 陰極側マウント Ｌ レーザ発振装置 ａ 砥石 ｂ 定板 ｃ スペーサ ＡＬ 電極間距離 １１ 陽極先端加工部 １１Ａ 陽極先端面の案内部 １２ 陽極胴部 １３ 陽極平面加工部 ２０ 陰極 ２１ 陰極先端加工部 ２２ 陰極胴部 ２３ 陰極平面加工部 ２４ 陰極コイル部 ２５ 破断破片 ２５Ａ 陰極部材の先端部 ２５Ｂ 陰極側破断部（切削箇所） DESCRIPTION OF SYMBOLS 1, 10 Anode 2 Cathode member 3 Molybdenum foil 4 External lead rod 5 Arc tube 51 Anode side tube 52 Cathode side tube 6 Exhaust tube 7 Breaking bar 8 Halogen compound 9 Mercury A1, A2 Anode side mount B1, B2 Cathode side mount L Laser oscillation device a Whetstone b Surface plate c Spacer AL Distance between electrodes 11 Anode tip processing part 11A Anode tip surface guide part 12 Anode body part 13 Anode plane processing part 20 Cathode 21 Cathode tip processing part 22 Cathode body 23 Cathode plane Processed part 24 Cathode coil part 25 Fragment debris 25A Tip part of cathode member 25B Cathode side fractured part (cut part)
Claims (3)
たショートアーク放電ランプを製造する方法であって、 一対の電極の一方の先端面に、対向する他方の電極を軸
中心に案内する案内部を設け、該他方の電極の先端面
に、該案内部に当接する形状の先端部を形成する電極加
工工程と、 完成した電極間に所望の電極間距離を確保すべく、少な
くとも何れか一方の電極側に破断部を形成する破断部形
成工程と、 前記一方の電極の案内部に他方の電極先端部を軸中心に
当接させた状態で発光管の両側を封止するシール工程
と、 その後に、前記発光管に形成されている前記排気管の先
端開口から破断棒を挿入し、前記電極部材の破断部を破
断させて切り離すことによって、発光管中に所望の距離
に離間した一対の電極を形成する破断工程と、 該破断工程において破断した破片を前記排気管より取り
出す破片排出工程とを含むことを特徴とする放電ランプ
の製造方法。1. A method of manufacturing a short arc discharge lamp having a pair of electrodes opposed to each other in an arc tube, wherein one end surface of the pair of electrodes is guided around the other electrode facing the other. An electrode processing step of forming a leading end portion having a shape in contact with the guiding portion on the leading end surface of the other electrode, and at least any one of the following steps to secure a desired inter-electrode distance between the completed electrodes. A breaking portion forming step of forming a breaking portion on one of the electrode sides, and a sealing step of sealing both sides of the arc tube with the tip of the other electrode in contact with the guide portion of the one electrode around the axis. After that, a breaking rod was inserted from a tip opening of the exhaust pipe formed in the arc tube, and a broken portion of the electrode member was broken and cut off to separate a desired distance into the arc tube. A breaking step of forming a pair of electrodes; Method for producing a discharge lamp which comprises a debris discharge step of removing from said exhaust pipe debris broken in the cross-sectional step.
極の先端面同士を軸中心に当接させた状態で先端面同士
を溶接して、その後の破断部形成工程において所望の電
極間距離を確保すべく、前記溶接した箇所及びいずれか
一方の電極側の２箇所に破断部を形成することを特徴と
する前記請求項１に記載の放電ランプの製造方法。2. After the electrode processing step, the tip surfaces of the pair of electrodes are welded to each other in a state where the tip surfaces of the pair of electrodes are in contact with each other about an axis, and a desired inter-electrode distance is formed in a subsequent break portion forming step. 2. The method for manufacturing a discharge lamp according to claim 1, wherein a broken portion is formed at the welded position and at two positions on one of the electrode sides in order to ensure the reliability.
の電極の案内部の形状を凹状とし、該案内部に当接する
前記他方の電極の先端部の形状を凸状に形成することを
特徴とする前記請求項１に記載の放電ランプの製造方
法。3. In the electrode processing step, a shape of a guide portion of the one electrode is made concave, and a shape of a tip portion of the other electrode contacting the guide portion is formed in a convex shape. The method for manufacturing a discharge lamp according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8224630A JPH1055757A (en) | 1996-08-08 | 1996-08-08 | Manufacture of discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8224630A JPH1055757A (en) | 1996-08-08 | 1996-08-08 | Manufacture of discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1055757A true JPH1055757A (en) | 1998-02-24 |
Family
ID=16816730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8224630A Pending JPH1055757A (en) | 1996-08-08 | 1996-08-08 | Manufacture of discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1055757A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6679746B2 (en) | 2000-06-26 | 2004-01-20 | Matsushita Electric Industrial Co., Ltd. | Method for producing discharge lamp and discharge lamp |
-
1996
- 1996-08-08 JP JP8224630A patent/JPH1055757A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6679746B2 (en) | 2000-06-26 | 2004-01-20 | Matsushita Electric Industrial Co., Ltd. | Method for producing discharge lamp and discharge lamp |
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