JP2009289568A - Ultrahigh pressure mercury lamp - Google Patents

Ultrahigh pressure mercury lamp Download PDF

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Publication number
JP2009289568A
JP2009289568A JP2008140427A JP2008140427A JP2009289568A JP 2009289568 A JP2009289568 A JP 2009289568A JP 2008140427 A JP2008140427 A JP 2008140427A JP 2008140427 A JP2008140427 A JP 2008140427A JP 2009289568 A JP2009289568 A JP 2009289568A
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Prior art keywords
foil
electrode
welded portion
pressure mercury
mercury lamp
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Inventor
Toshimitsu Tanaka
俊光 田中
Naoki Goto
直樹 後藤
Nobuyuki Konno
伸幸 今野
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Osram Melco Ltd
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Osram Melco Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrahigh pressure mercury lamp having little risk of burst of a quartz bulb, and high reliability. <P>SOLUTION: This ultrahigh pressure mercury lamp has an arc tube in which a pair of electrode systems are sealed in a quartz bulb. The pair of electrode systems respectively comprises electrodes 21a and 21b having electrode welding parts 21a-2 and 21b-2, foils 22a and 22b connected to the electrode welding parts 21a-2 and 21b-2 in foil welding parts 22a-1 and 22b-1 of each one end, and lead wires connected to the other ends of the foils 22a and 22b. The foil welding parts 22a-1 and 22b-1 are formed into a nearly rectangular shape, and a relationship between a width Ws of the foil welding parts 22a-1 and 22b-1 in a direction crossing the center axis of the arc tube and a diameter d of the electrode welding parts 21a-2 and 21b-2 is set to satisfy a formula 1.0≤Ws/d≤1.4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、プロジェクター用光源に使用される超高圧水銀ランプに関するもので、更に詳しくは発光管の電極芯線と箔との溶接部の構造に関する。   The present invention relates to an ultra-high pressure mercury lamp used for a light source for a projector, and more particularly to a structure of a welded portion between an electrode core wire and a foil of an arc tube.

プロジェクター用光源に使用される超高圧水銀ランプ（以下、ランプと呼ぶ場合もある）の発光管は、石英ガラスチューブの中に電極システムを挿入し、これらを封止する。超高圧水銀ランプの発光管の内部圧力は非常に高く、２００気圧に達する場合もある。
特開平１１−０６７１５６号公報 An arc tube of an ultra-high pressure mercury lamp (hereinafter sometimes referred to as a lamp) used as a light source for a projector inserts an electrode system into a quartz glass tube and seals them. The internal pressure of the arc tube of the ultra-high pressure mercury lamp is very high and may reach 200 atmospheres.
Japanese Patent Application Laid-Open No. 11-067156

そのため、ランプの点灯中に発光管の石英ガラスチューブが、内圧に耐えきれずに破裂することがある。特に、電極溶接部の石英ガラスチューブと箔との密着性が悪くその間に隙間が生じる。その隙間に高圧の水銀が入り込み、石英ガラスチューブが破裂することがある。尚、以下この明細書では、石英ガラスチューブを石英バルブと呼ぶことにする。   Therefore, the quartz glass tube of the arc tube may burst without being able to withstand the internal pressure while the lamp is lit. In particular, the adhesion between the quartz glass tube and the foil at the electrode welded portion is poor, and a gap is generated between them. High-pressure mercury may enter the gap and the quartz glass tube may burst. In the following description, the quartz glass tube is referred to as a quartz bulb.

この発明は、上記のような課題を解決するためになされたもので、石英バルブの破裂する恐れが少なく、信頼性の高い超高圧水銀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 above-described problems, and an object of the present invention is to provide a highly reliable ultra-high pressure mercury lamp that is less likely to rupture a quartz bulb.

この発明に係る超高圧水銀ランプは、石英バルブ内に一対の電極システムを封止した発光管を有する超高圧水銀ランプにおいて、
前記一対の電極システムは、夫々、電極溶接部を有する電極と、一端が前記電極溶接部に箔溶接部が溶接される箔と、前記箔の他端に接続されるリード線とを備え、
前記箔溶接部を略長方形の平板とし、前記箔溶接部の前記発光管の中心軸に直交する方向の幅Ｗｓと、前記電極溶接部の直径ｄとの関係を、
１．０≦Ｗｓ／ｄ≦１．４
としたことを特徴とする。 The ultra high pressure mercury lamp according to the present invention is an ultra high pressure mercury lamp having an arc tube in which a pair of electrode systems are sealed in a quartz bulb.
Each of the pair of electrode systems includes an electrode having an electrode weld, a foil having one end welded to the electrode weld and a foil weld, and a lead connected to the other end of the foil.
The foil welded portion is a substantially rectangular flat plate, and the relationship between the width Ws of the foil welded portion in the direction perpendicular to the central axis of the arc tube and the diameter d of the electrode welded portion,
1.0 ≦ Ws / d ≦ 1.4
It is characterized by that.

前記箔溶接部の根元と前記電極溶接部の先端との間の距離Ｌと、前記電極溶接部の直径ｄとの関係を、
Ｌ＞ｄ
としたことを特徴とする。 The relationship between the distance L between the base of the foil welded portion and the tip of the electrode welded portion, and the diameter d of the electrode welded portion,
L> d
It is characterized by that.

前記箔は、前記箔溶接部付近の角部を丸く面取りしたことを特徴とする。   The foil is characterized in that a corner portion in the vicinity of the foil welded portion is rounded and chamfered.

前記箔溶接部の先端の面取りＲ１、前記箔溶接部の根元の面取りＲ２、前記箔の前記箔溶接部側端部の面取りＲ３を、
Ｒ１，Ｒ２，Ｒ３≧０．１ｍｍ
としたことを特徴とする。 The chamfer R1 at the tip of the foil welded portion, the chamfer R2 at the base of the foil welded portion, the chamfer R3 at the end of the foil welded portion of the foil,
R1, R2, R3 ≧ 0.1mm
It is characterized by that.

前記電極溶接部と前記箔溶接部とを１点の溶接により固定することを特徴とする。   The electrode welded portion and the foil welded portion are fixed by one-point welding.

この発明に係る超高圧水銀ランプは、箔溶接部を略長方形の平板とし、箔溶接部の発光管の中心軸に直交する方向の幅Ｗｓと、電極溶接部の直径ｄとの関係を、
１．０≦Ｗｓ／ｄ≦１．４
としたことにより、箔の封止後の石英バルブ、電極溶接部、箔溶接部の間に生じる隙間を、従来の超高圧水銀ランプの封止後の隙間よりも小さくすることができるため、超高圧水銀ランプの点灯中の箔と石英バルブとの剥離を抑制できる。そのため、石英バルブが破裂する恐れが少なく、信頼性の高い超高圧水銀ランプを提供することができる。 In the ultrahigh pressure mercury lamp according to the present invention, the foil welded portion is a substantially rectangular flat plate, and the relationship between the width Ws in the direction perpendicular to the central axis of the arc tube of the foil welded portion and the diameter d of the electrode welded portion,
1.0 ≦ Ws / d ≦ 1.4
As a result, the gap generated between the quartz bulb, the electrode welded portion, and the foil welded portion after sealing the foil can be made smaller than the clearance after sealing the conventional ultra-high pressure mercury lamp. Separation of the foil and the quartz bulb during lighting of the high-pressure mercury lamp can be suppressed. Therefore, there is little possibility that the quartz bulb will burst, and a highly reliable ultra-high pressure mercury lamp can be provided.

箔溶接部の根元と電極溶接部の先端との間の距離Ｌと、電極溶接部の直径ｄとの関係を、
Ｌ＞ｄ
としたことにより、封止後の隙間を確実に小さくすることができる。 The relationship between the distance L between the root of the foil weld and the tip of the electrode weld and the diameter d of the electrode weld is
L> d
By doing so, the gap after sealing can be reliably reduced.

箔の箔溶接部付近の角部を丸く面取りしたことにより、石英バルブの応力集中を避けることができる。石英バルブに亀裂が発生して剥離が進行する恐れが少ない。   By rounding the corners near the foil welded portion of the foil, stress concentration of the quartz bulb can be avoided. There is little risk of cracks occurring in the quartz bulb and delamination.

箔溶接部の先端の面取りＲ１、箔溶接部の根元の面取りＲ２、箔の箔溶接部側端部の面取りＲ３を、
Ｒ１，Ｒ２，Ｒ３≧０．１ｍｍ
としたことにより、石英バルブの応力集中を避けることができる。石英バルブに亀裂が発生して剥離が進行する恐れが少ない。 Chamfer R1 at the tip of the foil welded portion, chamfer R2 at the base of the foil welded portion, chamfer R3 at the end of the foil welded portion of the foil,
R1, R2, R3 ≧ 0.1mm
By doing so, stress concentration of the quartz bulb can be avoided. There is little risk of cracks occurring in the quartz bulb and delamination.

電極溶接部と箔溶接部とを１点の溶接により固定することにより、溶接により箔が劣化し、点灯中の箔切れを起こす恐れを回避できる。   By fixing the electrode welded portion and the foil welded portion by one-point welding, it is possible to avoid the possibility that the foil deteriorates due to welding and the foil breaks during lighting.

実施の形態１．
図１乃至図６は実施の形態１を示す図で、図１は超高圧水銀ランプ１００の一部を破断した側面図、図２は発光管２の断面図、図３は箔２２ｂの平面図、図４は箔２２ｂを電極２１ｂに溶接した状態を示す図、図５は図４のＡ−Ａ断面図で、封止後の箔２２ｂと電極２１ｂとの溶接部付近の断面図である。図６は比較のために示す従来の超高圧水銀ランプ１００の封止後の溶接部付近の断面図である。 Embodiment 1 FIG.
1 to 6 show the first embodiment. FIG. 1 is a side view in which a part of the ultrahigh pressure mercury lamp 100 is broken, FIG. 2 is a sectional view of the arc tube 2, and FIG. 3 is a plan view of the foil 22b. 4 is a view showing a state in which the foil 22b is welded to the electrode 21b, and FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4, and is a cross-sectional view in the vicinity of the welded portion between the foil 22b and the electrode 21b after sealing. FIG. 6 is a cross-sectional view of the vicinity of a welded portion after sealing of a conventional ultrahigh pressure mercury lamp 100 shown for comparison.

本実施の形態は、発光管２の内部に配置される電極と箔との溶接部に特徴がある。従って、超高圧水銀ランプ１００の全体構成については、簡単に説明する。   The present embodiment is characterized by the welded portion between the electrode and the foil disposed inside the arc tube 2. Therefore, the overall configuration of the ultra high pressure mercury lamp 100 will be briefly described.

図１に示すように、超高圧水銀ランプ１００は、反射鏡３（図１の例は、放物型）の内部に発光管２が収納される。発光管２は、反射鏡３のネック部３ｂにセメント１８により固定される。発光管２の中心軸２ａが、反射鏡３の開口部３ａとネック部３ｂを結ぶ中心軸に一致し、発光部１１の中心が反射鏡３の焦点となる状態で固定される。セメント１８の主成分は、シリカである。   As shown in FIG. 1, an ultrahigh pressure mercury lamp 100 has an arc tube 2 housed inside a reflecting mirror 3 (a parabolic type in the example of FIG. 1). The arc tube 2 is fixed to the neck portion 3 b of the reflecting mirror 3 with cement 18. The central axis 2 a of the arc tube 2 is aligned with the central axis connecting the opening 3 a and the neck portion 3 b of the reflector 3, and the center of the light emitter 11 is fixed in a state where it becomes the focal point of the reflector 3. The main component of the cement 18 is silica.

発光管２については後述するが、発光管２の電極システム２４ａの電極２１ａに接続するリード線２３ａが、発光管２の前面側端面（反射鏡３の開口部３ａ側）から引き出される。リード線２３ａは、第１の端子１５ａに接続される。   Although the arc tube 2 will be described later, a lead wire 23a connected to the electrode 21a of the electrode system 24a of the arc tube 2 is drawn from the front side end face of the arc tube 2 (opening 3a side of the reflecting mirror 3). The lead wire 23a is connected to the first terminal 15a.

また、発光管２の電極システム２４ｂの電極２１ｂに接続するリード線２３ｂが、発光管２の背面側端面（反射鏡３のネック部３ｂ側）から引き出される。リード線２３ｂは、第２の端子１５ｂに接続される。   Further, the lead wire 23b connected to the electrode 21b of the electrode system 24b of the arc tube 2 is drawn out from the rear side end face of the arc tube 2 (neck portion 3b side of the reflecting mirror 3). The lead wire 23b is connected to the second terminal 15b.

石英バルブ２０のモリブデン箔２２ａの周囲を覆う部分に、トリガーコイル１７が巻かれる。トリガーコイル１７は、第２の端子１５ｂに接続する。   A trigger coil 17 is wound around a portion of the quartz bulb 20 that covers the periphery of the molybdenum foil 22a. The trigger coil 17 is connected to the second terminal 15b.

反射鏡３の前面の開口部３ａに、透光性の前面ガラス１９が取り付けられる。   A translucent front glass 19 is attached to the opening 3 a on the front surface of the reflecting mirror 3.

発光管２の発光部１１の中心が、球面、楕円面、放物面等の碗状の反射鏡３の焦点に位置する。放射された光は、反射鏡３の内面に施された反射膜によって反射され、ランプ前方に放射される。放射された光はランプ前方に設けられ光学系に入射する。   The center of the light emitting section 11 of the arc tube 2 is located at the focal point of a bowl-shaped reflecting mirror 3 such as a spherical surface, an ellipsoid, or a paraboloid. The emitted light is reflected by the reflecting film applied to the inner surface of the reflecting mirror 3 and is emitted in front of the lamp. The emitted light is provided in front of the lamp and enters the optical system.

図２により、発光管２の構成を説明する。発光管２は、一対の電極システム２４ａと電極システム２４ｂとが石英バルブ２０内に配置される。電極システム２４ａは、電極２１ａ、箔２２ａ、リード線２３ａを備える。同様に、電極システム２４ｂは、電極２１ｂ、箔２２ｂ、リード線２３ｂを備える。発光管２内には、水銀２５と希ガスが封入される。そして、発光管２の両端部は、石英バルブ２０を加熱・溶融することで封止られる。   The configuration of the arc tube 2 will be described with reference to FIG. In the arc tube 2, a pair of electrode system 24 a and electrode system 24 b are disposed in the quartz bulb 20. The electrode system 24a includes an electrode 21a, a foil 22a, and a lead wire 23a. Similarly, the electrode system 24b includes an electrode 21b, a foil 22b, and a lead wire 23b. In the arc tube 2, mercury 25 and a rare gas are enclosed. The both ends of the arc tube 2 are sealed by heating and melting the quartz bulb 20.

以下、電極システム２４ａ及び電極システム２４ｂの構成を、電極システム２４ｂを例に説明する。電極システム２４ａの構成も、電極システム２４ｂと同じである。電極システム２４ａも、放電部２１ａ−１、電極溶接部２１ａ−２、芯線２１ａ−４を有する電極２１ａに箔溶接部２２ａ−１を有する箔２２ａの一端が固定され、箔２２ａの他端にリード線２３ａが接続される。   Hereinafter, the configurations of the electrode system 24a and the electrode system 24b will be described by taking the electrode system 24b as an example. The configuration of the electrode system 24a is the same as that of the electrode system 24b. In the electrode system 24a, one end of the foil 22a having the foil welded portion 22a-1 is fixed to the electrode 21a having the discharge portion 21a-1, the electrode welded portion 21a-2, and the core wire 21a-4, and the other end of the foil 22a is lead. The line 23a is connected.

図３に示すように、電極システム２４ｂの箔２２ｂの電極２１ｂ側端部に、箔２２ｂの幅Ｗｏよりも小さい幅Ｗｓの箔溶接部２２ｂ−１を設ける。箔溶接部２２ｂ−１は、略長方形の平板である。幅Ｗｓは箔溶接部２２ｂ−１の発光管２の中心軸２ａに直交する方向の幅である。   As shown in FIG. 3, a foil welded portion 22b-1 having a width Ws smaller than the width Wo of the foil 22b is provided at the end of the foil 22b of the electrode system 24b on the electrode 21b side. The foil welded part 22b-1 is a substantially rectangular flat plate. The width Ws is a width in a direction perpendicular to the central axis 2a of the arc tube 2 of the foil welded portion 22b-1.

図４に示すように、箔２２ｂの箔溶接部２２ｂ−１に電極２１ｂの電極溶接部２１ｂ−２を合わせて溶接する。電極溶接部２１ｂ−２は、芯線２１ｂ−４の一方の端部（放電部２１ｂ−１の反対側）である。   As shown in FIG. 4, the electrode welded portion 21b-2 of the electrode 21b and the foil welded portion 22b-1 of the foil 22b are welded together. The electrode weld 21b-2 is one end of the core wire 21b-4 (the opposite side of the discharge part 21b-1).

電極溶接部２１ｂ−２は、一例では、略円柱形状である。ここで、電極溶接部２１ｂ−２の直径ｄと、箔溶接部２２ｂ−１の幅Ｗｓとは、以下に示す関係を満たす。
１．０≦Ｗｓ／ｄ≦１．４ （１） The electrode welding part 21b-2 is substantially cylindrical shape in an example. Here, the diameter d of the electrode welded part 21b-2 and the width Ws of the foil welded part 22b-1 satisfy the relationship shown below.
1.0 ≦ Ws / d ≦ 1.4 (1)

箔溶接部２２ｂ−１の幅Ｗｓを箔２２ｂの幅Ｗｏよりも小さくし、電極溶接部２１ｂ−２の直径ｄとの関係を上記（１）式を満たすようにすることにより、箔２２ｂの封止後の石英バルブ２０、電極溶接部２１ｂ−２、箔溶接部２２ｂ−１の間に生じる隙間２６（図５参照）を、従来の超高圧水銀ランプ１００の封止後の隙間２６（図６参照）よりも小さくすることができる。隙間２６が小さくなるため、超高圧水銀ランプ１００の点灯中の箔２２ｂと石英バルブ２０との剥離を抑制できる。そのため、石英バルブ２０が破裂する恐れが少なく、信頼性の高い超高圧水銀ランプ１００を提供することができる。   By making the width Ws of the foil welded portion 22b-1 smaller than the width Wo of the foil 22b and satisfying the above equation (1) with the diameter d of the electrode welded portion 21b-2, the sealing of the foil 22b is performed. A gap 26 (see FIG. 5) generated between the quartz bulb 20, the electrode welded portion 21b-2, and the foil welded portion 22b-1 after stopping is used as a gap 26 (see FIG. 6) after sealing the conventional ultrahigh pressure mercury lamp 100. Smaller than the reference). Since the gap 26 is reduced, peeling between the foil 22b and the quartz bulb 20 during the operation of the ultrahigh pressure mercury lamp 100 can be suppressed. Therefore, there is little possibility that the quartz bulb 20 will rupture, and a highly reliable ultra-high pressure mercury lamp 100 can be provided.

Ｗｓ／ｄ＜１．０では、箔２２ｂの製造工程、並びに点灯時の箔切れが発生する恐れがある。   If Ws / d <1.0, there is a risk that the foil 22b manufacturing process and foil breakage during lighting may occur.

また、１．４＜Ｗｓ／ｄでは、隙間２６が大きくなり、超高圧水銀ランプ１００の点灯中の箔２２ｂと石英バルブ２０との剥離を抑制する効果が少なくなる。   Further, when 1.4 <Ws / d, the gap 26 becomes large, and the effect of suppressing the peeling between the foil 22b and the quartz bulb 20 during lighting of the ultrahigh pressure mercury lamp 100 is reduced.

尚、図４において、箔溶接部２２ｂ−１の根元と電極溶接部２１ｂ−２の先端との間の距離Ｌは、
Ｌ＞ｄ （２）
の関係とする。（２）を満たすことにより、封止後の隙間２６を確実に小さくすることができる。（２）式を満たさない場合には、箔２２ｂの幅Ｗｏの影響を受けて隙間２６が小さくならない可能性があるので、好ましくない。 In FIG. 4, the distance L between the root of the foil welded portion 22b-1 and the tip of the electrode welded portion 21b-2 is
L> d (2)
The relationship. By satisfying (2), the gap 26 after sealing can be reliably reduced. If the formula (2) is not satisfied, the gap 26 may not be reduced due to the influence of the width Wo of the foil 22b, which is not preferable.

以上のように、この実施の形態によれば、箔溶接部２２ｂ−１の幅Ｗｓを箔２２ｂの幅Ｗｏよりも小さくし、電極溶接部２１ｂ−２の直径ｄとの関係を、上記（１）式を満たすようにすることにより、箔２２ｂの封止後の石英バルブ２０、電極溶接部２１ｂ−２、箔溶接部２２ｂ−１の間に生じる隙間２６を、従来の超高圧水銀ランプ１００の封止後の隙間２６よりも小さくすることができるため、隙間２６が小さくなり、超高圧水銀ランプ１００の点灯中の箔２２ｂと石英バルブ２０との剥離を抑制できる。そのため、石英バルブ２０が破裂する恐れが少なく、信頼性の高い超高圧水銀ランプ１００を提供することができる。   As described above, according to this embodiment, the width Ws of the foil welded portion 22b-1 is made smaller than the width Wo of the foil 22b, and the relationship with the diameter d of the electrode welded portion 21b-2 is the above (1). ) To satisfy the gap 26 formed between the quartz bulb 20, the electrode welded portion 21b-2, and the foil welded portion 22b-1 after sealing the foil 22b. Since the gap 26 can be made smaller than the gap 26 after sealing, the gap 26 is reduced, and the peeling of the foil 22b and the quartz bulb 20 during the operation of the ultrahigh pressure mercury lamp 100 can be suppressed. Therefore, there is little possibility that the quartz bulb 20 will rupture, and a highly reliable ultra-high pressure mercury lamp 100 can be provided.

また、箔溶接部２２ｂ−１の根元と電極溶接部２１ｂ−２の先端との間の距離Ｌを、上記（２）式を満たすようにすることにより、封止後の隙間２６を確実に小さくすることができる。   Moreover, the gap | interval 26 after sealing is reliably made small by satisfy | filling the said (2) Formula to the distance L between the root of the foil welded part 22b-1, and the front-end | tip of the electrode welded part 21b-2. can do.

実施の形態２．
図７は実施の形態２を示す図で、箔２２ｂの部分平面図である。 Embodiment 2. FIG.
FIG. 7 is a diagram showing the second embodiment and is a partial plan view of the foil 22b.

以下の説明は、電極システム２４ｂについて行うが、電極システム２４ａの構成も、電極システム２４ｂと同じである。   The following description will be given for the electrode system 24b, but the configuration of the electrode system 24a is the same as that of the electrode system 24b.

実施の形態１の図３に示すように、箔２２ｂの箔溶接部２２ｂ−１付近の角部が直角であると、角部の石英バルブ２０に応力集中が起こる。応力が集中すると、石英バルブ２０に亀裂が発生して剥離が進行する恐れがある。   As shown in FIG. 3 of the first embodiment, when the corner of the foil 22b near the welded portion 22b-1 is a right angle, stress concentration occurs in the quartz bulb 20 at the corner. If the stress is concentrated, the quartz bulb 20 may be cracked and peeling may proceed.

そこで、本実施の形態では、図７に示すように、箔２２ｂの箔溶接部２２ｂ−１付近の角部を丸く面取りしている。   Therefore, in the present embodiment, as shown in FIG. 7, the corner of the foil 22b near the foil welded portion 22b-1 is rounded and chamfered.

箔溶接部２２ｂ−１の先端の面取りＲ１は、一例では、Ｗｓが０．６ｍｍのとき、０．３ｍｍである。   In one example, the chamfer R1 at the tip of the foil welded portion 22b-1 is 0.3 mm when Ws is 0.6 mm.

箔溶接部２２ｂ−１の根元の面取りＲ２は、一例では、Ｗｏが２．５ｍｍのとき、０．７ｍｍである。   In one example, the chamfer R2 at the base of the foil welded portion 22b-1 is 0.7 mm when Wo is 2.5 mm.

箔２２ｂの箔溶接部２２ｂ−１側端部の面取りＲ３は、一例では、Ｗｏが２．５ｍｍのとき、０．２ｍｍである。   In one example, the chamfer R3 of the end portion of the foil 22b on the side of the welded portion 22b-1 is 0.2 mm when Wo is 2.5 mm.

箔溶接部２２ｂ−１の先端の面取りＲ１、箔溶接部２２ｂ−１の根元の面取りＲ２、箔２２ｂの箔溶接部２２ｂ−１側端部の面取りＲ３は、
Ｒ１，Ｒ２，Ｒ３≧０．１ｍｍ （３）
であれば、箔２２ｂの箔溶接部２２ｂ−１付近の角部による石英バルブ２０の応力集中を避けることができる。 The chamfer R1 at the tip of the foil weld 22b-1, the chamfer R2 at the root of the foil weld 22b-1, and the chamfer R3 at the end of the foil 22b on the side of the foil weld 22b-1 are:
R1, R2, R3 ≧ 0.1mm (3)
If so, stress concentration of the quartz bulb 20 due to the corners of the foil 22b near the foil welded portion 22b-1 can be avoided.

以上のように、この実施の形態によれば、箔２２ｂの箔溶接部２２ｂ−１付近の角部を丸く面取りすることにより、石英バルブ２０の応力集中を避けることができる。石英バルブ２０に亀裂が発生して剥離が進行する恐れが少ない。   As described above, according to this embodiment, stress concentration of the quartz bulb 20 can be avoided by rounding the corners of the foil 22b in the vicinity of the foil welded portion 22b-1. There is little risk of cracks occurring in the quartz bulb 20 and peeling.

また、箔溶接部２２ｂ−１の先端の面取りＲ１、箔溶接部２２ｂ−１の根元の面取りＲ２、箔２２ｂの箔溶接部２２ｂ−１側端部の面取りＲ３を、Ｒ１，Ｒ２，Ｒ３≧０．１ｍｍとすることにより、箔２２ｂの箔溶接部２２ｂ−１付近の角部による石英バルブ２０の応力集中を避けることができる。石英バルブ２０に亀裂が発生して剥離が進行する恐れが少ない。   Further, chamfering R1 at the tip of the foil welded portion 22b-1, chamfering R2 at the root of the foil welded portion 22b-1, and chamfering R3 at the end of the foil welded portion 22b-1 on the side of the foil welded portion 22b-1 are R1, R2, R3 ≧ 0 By setting the thickness to 0.1 mm, it is possible to avoid stress concentration of the quartz bulb 20 due to a corner portion of the foil 22b near the welded portion 22b-1. There is little risk of cracks occurring in the quartz bulb 20 and peeling.

実施の形態３．
図８は実施の形態３を示す図で、溶接部付近の側面図（ａ）と平面図（ｂ）である。 Embodiment 3 FIG.
FIG. 8 is a view showing the third embodiment, and is a side view (a) and a plan view (b) in the vicinity of the welded portion.

以下の説明は、電極システム２４ｂについて行うが、電極システム２４ａの構成も、電極システム２４ｂと同じである。   The following description will be given for the electrode system 24b, but the configuration of the electrode system 24a is the same as that of the electrode system 24b.

電極溶接部２１ｂ−２と箔溶接部２２ｂ−１とは、溶接により固定される。但し、溶接により箔２２ｂが劣化し、点灯中の箔切れを起こす恐れがある。   The electrode weld 21b-2 and the foil weld 22b-1 are fixed by welding. However, the foil 22b may be deteriorated by welding, and the foil may be cut during lighting.

そのため、図８に示すように、電極溶接部２１ｂ−２と箔溶接部２２ｂ−１との溶接は、１点での溶接が好ましい。   Therefore, as shown in FIG. 8, the welding of the electrode welded portion 21b-2 and the foil welded portion 22b-1 is preferably a single point.

以上のように、この実施の形態によれば、電極溶接部２１ｂ−２と箔溶接部２２ｂ−１とを１点の溶接により固定するので、溶接により箔２２ｂが劣化し、点灯中の箔切れを起こす恐れを回避できる。   As described above, according to this embodiment, since the electrode welded portion 21b-2 and the foil welded portion 22b-1 are fixed by one point welding, the foil 22b is deteriorated by welding, and the foil breaks during lighting. You can avoid the fear of causing.

実施の形態１を示す図で、超高圧水銀ランプ１００の一部を破断した側面図。FIG. 3 shows the first embodiment and is a side view in which a part of the ultrahigh pressure mercury lamp 100 is broken. 実施の形態１を示す図で、発光管２の断面図。FIG. 3 shows the first embodiment and is a cross-sectional view of the arc tube 2. 実施の形態１を示す図で、箔２２ｂの平面図。Fig. 5 shows the first embodiment, and is a plan view of a foil 22b. 実施の形態１を示す図で、箔２２ｂを電極２１ｂに溶接した状態を示す図。The figure which shows Embodiment 1 and the figure which shows the state which welded the foil 22b to the electrode 21b. 実施の形態１を示す図で、図４のＡ−Ａ断面図で、封止後の箔２２ｂと電極２１ｂとの溶接部付近の断面図。FIG. 5 shows the first embodiment, and is a cross-sectional view taken along the line AA of FIG. 比較のために示す従来の超高圧水銀ランプ１００の封止後の溶接部付近の断面図。Sectional drawing of the welding part vicinity after the sealing of the conventional ultrahigh pressure mercury lamp 100 shown for a comparison. 実施の形態２を示す図で、箔２２ｂの部分平面図。FIG. 10 shows the second embodiment and is a partial plan view of a foil 22b. 実施の形態３を示す図で、溶接部付近の側面図（ａ）と平面図（ｂ）。It is a figure which shows Embodiment 3, and the side view (a) and plan view (b) near a welding part.

符号の説明Explanation of symbols

２ 発光管、２ａ 中心軸、３ 反射鏡、３ａ 開口部、３ｂ ネック部、１１ 発光部、１５ａ 第１の端子、１５ｂ 第２の端子、１７ トリガーコイル、１８ セメント、１９ 前面ガラス、２０ 石英バルブ、２１ａ 電極、２１ａ−１ 放電部、２１ａ−２ 電極溶接部、２１ａ−４ 芯線、２１ｂ 電極、２１ｂ−１ 放電部、２１ｂ−２ 電極溶接部、２１ｂ−４ 芯線、２２ａ 箔、２２ａ−１ 箔溶接部、２２ｂ 箔、２２ｂ−１ 箔溶接部、２３ａ リード線、２３ｂ リード線、２４ａ 電極システム、２４ｂ 電極システム、２５ 水銀、２６ 隙間、１００ 超高圧水銀ランプ。   2 arc tube, 2a central axis, 3 reflector, 3a opening, 3b neck, 11 light emitter, 15a first terminal, 15b second terminal, 17 trigger coil, 18 cement, 19 front glass, 20 quartz bulb , 21a electrode, 21a-1 discharge part, 21a-2 electrode welding part, 21a-4 core wire, 21b electrode, 21b-1 discharge part, 21b-2 electrode welding part, 21b-4 core wire, 22a foil, 22a-1 foil Welded part, 22b foil, 22b-1 foil welded part, 23a lead wire, 23b lead wire, 24a electrode system, 24b electrode system, 25 mercury, 26 gap, 100 super high pressure mercury lamp.

Claims (5)

石英バルブ内に一対の電極システムを封止した発光管を有する超高圧水銀ランプにおいて、
前記一対の電極システムは、夫々、電極溶接部を有する電極と、一端が前記電極溶接部に箔溶接部が溶接される箔と、前記箔の他端に接続されるリード線とを備え、
前記箔溶接部を略長方形の平板とし、前記箔溶接部の前記発光管の中心軸に直交する方向の幅Ｗｓと、前記電極溶接部の直径ｄとの関係を、
１．０≦Ｗｓ／ｄ≦１．４
としたことを特徴とする超高圧水銀ランプ。 In an ultra-high pressure mercury lamp having an arc tube with a pair of electrode systems sealed in a quartz bulb,
Each of the pair of electrode systems includes an electrode having an electrode weld, a foil having one end welded to the electrode weld and a foil weld, and a lead connected to the other end of the foil.
The foil welded portion is a substantially rectangular flat plate, and the relationship between the width Ws of the foil welded portion in the direction perpendicular to the central axis of the arc tube and the diameter d of the electrode welded portion,
1.0 ≦ Ws / d ≦ 1.4
An ultra-high pressure mercury lamp characterized by 前記箔溶接部の根元と前記電極溶接部の先端との間の距離Ｌと、前記電極溶接部の直径ｄとの関係を、
Ｌ＞ｄ
としたことを特徴とする請求項１記載の超高圧水銀ランプ。 The relationship between the distance L between the base of the foil welded portion and the tip of the electrode welded portion, and the diameter d of the electrode welded portion,
L> d
The ultra-high pressure mercury lamp according to claim 1, wherein 前記箔は、前記箔溶接部付近の角部を丸く面取りしたことを特徴とする請求項１又は請求項２記載の超高圧水銀ランプ。   The ultrahigh pressure mercury lamp according to claim 1 or 2, wherein the foil has a rounded chamfered corner near the welded portion of the foil. 前記箔溶接部の先端の面取りＲ１、前記箔溶接部の根元の面取りＲ２、前記箔の前記箔溶接部側端部の面取りＲ３を、
Ｒ１，Ｒ２，Ｒ３≧０．１ｍｍ
としたことを特徴とする請求項１乃至３のいずれかに記載の超高圧水銀ランプ。 The chamfer R1 at the tip of the foil welded portion, the chamfer R2 at the base of the foil welded portion, the chamfer R3 at the end of the foil welded portion of the foil,
R1, R2, R3 ≧ 0.1mm
The ultrahigh pressure mercury lamp according to any one of claims 1 to 3, wherein 前記電極溶接部と前記箔溶接部とを１点の溶接により固定することを特徴とする請求項１乃至４のいずれかに記載の超高圧水銀ランプ。   The ultra high pressure mercury lamp according to any one of claims 1 to 4, wherein the electrode welded portion and the foil welded portion are fixed by one-point welding.
JP2008140427A 2008-05-29 2008-05-29 Ultrahigh pressure mercury lamp Pending JP2009289568A (en)

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