WO2010004685A1 - Hid lamp - Google Patents
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- WO2010004685A1 WO2010004685A1 PCT/JP2009/002524 JP2009002524W WO2010004685A1 WO 2010004685 A1 WO2010004685 A1 WO 2010004685A1 JP 2009002524 W JP2009002524 W JP 2009002524W WO 2010004685 A1 WO2010004685 A1 WO 2010004685A1
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- earth metal
- coil
- hid lamp
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
- H01J61/366—Seals for leading-in conductors
Definitions
- the present invention relates to an HID lamp (high-intensity discharge lamp) used as a lamp having high luminance, high efficiency, and high color rendering.
- HID lamp high-intensity discharge lamp
- an electrode is held at both ends of a discharge vessel, and power is supplied to the electrode from the outside through a molybdenum foil.
- silica and alumina ceramics are used as the material for the discharge vessel.
- a high color rendering property is expressed in the discharge vessel as a rare earth gas.
- Halogen compounds composed of multiple rare earth metals such as dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm), ytterbium (Yb) are enclosed for the purpose.
- Metal halide lamps are known.
- a plug of an electrode which is sealed with frit glass and a part of the electrode is exposed to the outside from the sealed portion is made of niobium (Nb) or an alloy thereof similar in thermal behavior to the material of the discharge vessel, and further tungsten ( W), molybdenum (Mo), conductive ceramics and glass containing a heat-resistant metal such as niobium (Nb), and the tip portion facing the discharge space from the intermediate portion held inside the sealed portion has excellent heat resistance and Tungsten (W) or molybdenum (Mo) that is chemically stable against metal halide is used, and these are welded to form one electrode.
- Patent Document 4 a thin film made of an oxide of a rare earth metal constituting a metal halide sealed in a discharge vessel on the surface of a plug made of Nb or an alloy thereof, and on the surface of a welded portion between the plug and the electrode. Has been proposed to prevent Nb from forming a low melting point alloy with a W or Mo electrode.
- the present invention provides an electrode unit formed by welding an electrode made of tungsten (W) or molybdenum (Mo) to a plug made of niobium (Nb) or an alloy thereof, at both ends of a ceramic discharge vessel.
- a ceramic discharge vessel In an HID lamp that is inserted into a sealing portion provided in a section, filled with frit glass between the sealing portion and a plug, and wound around the outside of the electrode, between the electrode and the coil
- the gap formed was filled with an oxide of a rare earth metal constituting a compound (metal halide) of a rare earth metal and a halogen sealed in the discharge vessel.
- the filling of the present invention includes cases where some gaps remain.
- a compound of rare earth metal and halogen enclosed in the discharge vessel in a region straddling the welded portion between the plug and the electrode on the outer peripheral surface of the electrode unit is further improved by forming a film of an oxide of a rare earth metal constituting (metal halide).
- rare earth metal examples include dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm), ytterbium (Yb), or a simple substance. . Further, as a method for forming the thin film, a dipping method, a thermal spraying method, a CVD method, a gas deposition method, or the like can be employed.
- the metal halide does not easily reach the plug containing niobium (Nb)
- the niobium (Nb) is dissociated by the substitution reaction, and the electrode member such as tungsten (W) or molybdenum (Mo) has a low melting point. It is possible to prevent the alloy from being formed, and the life can be greatly improved.
- FIG. 3B is an enlarged view of the main part.
- FIG. 1 is an overall view of a luminaire incorporating the HID lamp according to the present invention
- FIG. 2 is a cross-sectional view of the main part of the HID lamp according to the present invention
- (b) is a figure which shows the state which wound the coil around the electrode outer peripheral surface
- FIG. 4 is the principal part enlarged view of FIG.3 (b).
- the electrode units 7 and 8 are configured by welding electrodes 7b and 8b made of tungsten (W) or molybdenum (Mo) to plugs 7a and 8a made of niobium (Nb) or an alloy thereof.
- the plugs 7a and 8a and the electrodes 7b and 8b are laser-welded from the outside in a state where the concave and convex portions are fitted.
- the discharge vessel of the HID lamp 3 is made of silica or alumina ceramics, the central part is a light emitting part 3a, both ends are sealed parts 3b, and the rare earth gas in the light emitting part 3a is nitrogen, argon, krypton, xenon, mercury. , Sodium halides, and other types of halides (mainly iodides) such as rare earth metals (Dy) are encapsulated.
- Nb (niobium) plugs 7a and 8a are hermetically held in the sealing portion 3b through a sealing material (frit glass) 9, and the sealing material 9 has a softening point (for example, slightly higher than 1500 ° C.).
- Dy 2 O 3 —SiO 2 —Al 2 O 3 based frit glass having a significantly lower viscosity is used.
- a cooling coil 10 is wound around the distal ends of the electrodes 7b and 8b, a cooling coil 11 is wound from the intermediate portion of the electrodes 7b and 8b to the welded portion, and the coil 11 and the electrodes 7b and 8b.
- Dy 2 O 3 In order to fill Dy 2 O 3 , for example, as shown in FIG. 3A, a fine powder of Dy 2 O 3 is ejected from the nozzle 13 at a high speed, and the surface of the electrodes 7b and 8b is Dy 2 O at room temperature. 3 film 12 is formed, and then as shown in (b), Dy 2 O 3 Turn strongly wound from the outer coil 11 of the film 12, the coil 11 is wound so as to bite into the Dy 2 O 3 film 12. As a result, as shown in FIG. 4, the gap between the coil 11 and the electrodes 7b and 8b is filled with Dy 2 O 3 . Since Dy 2 O 3 is densely packed in this way, the rare earth metal vapor can reach the Nb plugs 7a and 8a, and no substitution reaction occurs.
- the method of forming the rare earth metal oxide film is not limited to the above, and any method such as thermal spraying, CVD, sandblasting, dip coating may be used. Whichever method is adopted, the thickness of the film is preferably 30 ⁇ m or less when the electrode diameter is 0.7 mm ⁇ .
- SYMBOLS 1 ... Outer tube, 2 ... Inner tube, 3 ... HID lamp, 3a ... Light emission part, 3b ... Sealing part, 4 ... Base, 5, 6 ... Conductor, 7, 8 ... Electrode unit, 7a, 8a ... Plug body , 7b, 8b ... electrode, 9 ... sealing material, 10, 11 ... coil wound electrodes, 12, 14 ... Dy 2 O 3 film, 13 ... nozzle.
Abstract
Disclosed is an HID lamp that can suppress a chemical reaction between a rare earth metal, which is sealed in an electric discharge container, and an electrode and consequently can significantly improve the service life of the lamp. A coil (10) for cooling is wound around the front end of the electrodes (7b, 8b). A coil (11) for cooling is wound around a part from the middle part to a welded part of the electrodes (7b, 8b). Further, the gap between the coil (11) and the electrodes (7b, 8b) is filled with Dy2O3 as an oxide of a rare earth metal constituting a compound (metal halide) of a rare earth metal sealed in the electric discharge container and a halogen. Thus, since Dy2O3 is filled in this way, vapor of the rare earth metal does not reach the stopper (7a, 8a) of Nb and, thus, any substitution reaction does not occur.
Description
本発明は高輝度・高効率・高演色性の灯具として用いるＨＩＤランプ（高輝度放電ランプ）に関する。
The present invention relates to an HID lamp (high-intensity discharge lamp) used as a lamp having high luminance, high efficiency, and high color rendering.
放電ランプの一般的な構造は、特許文献１に開示されるように、放電容器の両端に電極を保持すると共に、モリブデン箔を介して外部から電極に給電する構成をしている。
As a general structure of a discharge lamp, as disclosed in Patent Document 1, an electrode is held at both ends of a discharge vessel, and power is supplied to the electrode from the outside through a molybdenum foil.
放電容器の材料としては、一般にシリカやアルミナセラミックスなどが用いられており、放電容器内にはレアアースガスとして窒素やアルゴン、クリプトン、キセノン、水銀、ナトリウムハロゲン化物の他に、高演色性を発現させる目的でディスプロシウム（Ｄｙ）、スカンジウム（Ｓｃ）、ネオジウム（Ｎｄ）、ユロピウム（Ｅｕ）、ホルミウム（Ｈｏ）、ツリウム（Ｔｍ）、イッテルビウム（Ｙｂ）など希土類金属の複数からなるハロゲン化合物が封入されたメタルハライドランプが知られている。
In general, silica and alumina ceramics are used as the material for the discharge vessel. In addition to nitrogen, argon, krypton, xenon, mercury, and sodium halide, a high color rendering property is expressed in the discharge vessel as a rare earth gas. Halogen compounds composed of multiple rare earth metals such as dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm), ytterbium (Yb) are enclosed for the purpose. Metal halide lamps are known.
また、フリットガラスによって封止されるとともに一部が封止部位から外部に露出する電極の栓体を、放電容器の材料と熱的挙動が類似するニオブ（Ｎｂ）またはその合金、更にはタングステン(Ｗ)、モリブデン(Ｍｏ)、ニオブ(Ｎｂ)などの耐熱金属を含有する導電性セラミックス・ガラスとし、封止部位の内側に保持される中間部から放電空間に臨む先端部を優れた耐熱性やメタルハライドに対して化学的に安定なタングステン（Ｗ）またはモリブデン（Ｍｏ）とし、これらを溶接して１本の電極を構成している。
In addition, a plug of an electrode which is sealed with frit glass and a part of the electrode is exposed to the outside from the sealed portion is made of niobium (Nb) or an alloy thereof similar in thermal behavior to the material of the discharge vessel, and further tungsten ( W), molybdenum (Mo), conductive ceramics and glass containing a heat-resistant metal such as niobium (Nb), and the tip portion facing the discharge space from the intermediate portion held inside the sealed portion has excellent heat resistance and Tungsten (W) or molybdenum (Mo) that is chemically stable against metal halide is used, and these are welded to form one electrode.
ＨＩＤランプにあっては、放電中に電極が極めて高温になり、電極を構成する材料が、ハロゲンサイクルを無視して、一方的に飛散し発光管の内壁に付着する黒化現象が発生することがある。これを防止するために、特許文献１～３に開示されるように、電極の周囲にタングステン（Ｗ）やモリブデン（Ｍｏ）のコイルを巻回し、電極の発熱をコイルから放散して冷却する手段が講じられている。
In HID lamps, the electrode becomes extremely hot during discharge, and the material constituting the electrode is unilaterally scattered, ignoring the halogen cycle, and a blackening phenomenon occurs that adheres to the inner wall of the arc tube. There is. In order to prevent this, as disclosed in Patent Documents 1 to 3, a coil of tungsten (W) or molybdenum (Mo) is wound around the electrode, and the heat generated in the electrode is dissipated from the coil and cooled. Has been taken.
また放電容器の封止部位の内壁面と挿入した電極外周面との間に不可避に隙間が存在する。この隙間に固液のメタルハライドが停滞してしまう。この停滞したメタルハライドは、点灯により電極温度が上昇するに連れ、気体のハロゲンサイクルには寄与せず、直接接触する電極との間で化学反応を引き起こしてしまう。
In addition, there is an unavoidable gap between the inner wall surface of the sealed part of the discharge vessel and the outer peripheral surface of the inserted electrode. The solid-liquid metal halide stagnates in this gap. This stagnant metal halide does not contribute to the gaseous halogen cycle as the electrode temperature rises due to lighting, and causes a chemical reaction with the electrode in direct contact.
具体的な現象としては、Ｄｙが電極材料の一部であるＮｂと置換反応を起こし、Ｎｂが放電容器内部に移動し、ＤｙはＮｂ（電極材料）内に留まる。そして気化したＮｂはランプ消灯時にタングステン電極先端に付着する。更に次の点灯時には電極の発熱によりＷとＮｂの合金を形成する。この合金は純粋なタングステンよりも融点が低く、タングステン電極の先端が徐々に消耗すると言う現象を引き起こしてしまう。溶融して容器内に飛散した合金は、放電容器の内壁に蒸着して、外への発光を遮ってしまう。これにより光は放出できずに内壁で熱に変換され、放電容器内部の温度は、期待の温度に反して上昇する。これら一連の化学反応は増大の一途を辿り、最終的にランプの寿命が尽きてしまう。
As a specific phenomenon, Dy undergoes a substitution reaction with Nb which is a part of the electrode material, Nb moves into the discharge vessel, and Dy stays in Nb (electrode material). The vaporized Nb adheres to the tungsten electrode tip when the lamp is extinguished. Further, at the next lighting, an alloy of W and Nb is formed by heat generation of the electrodes. This alloy has a melting point lower than that of pure tungsten, and causes a phenomenon that the tip of the tungsten electrode is gradually consumed. The alloy that has been melted and scattered in the vessel is deposited on the inner wall of the discharge vessel and blocks light emission to the outside. As a result, light cannot be emitted and converted to heat on the inner wall, and the temperature inside the discharge vessel rises against the expected temperature. These series of chemical reactions continue to increase, and eventually the lamp life is exhausted.
そこで、特許文献４では、Ｎｂまたはその合金類からなる栓体の表面、この栓体と電極との溶接部位表面に、放電容器内に封入されるメタルハライドを構成する希土類金属の酸化物から成る薄膜を予め形成し、ＮｂがＷまたはＭｏ電極と低融点の合金を形成することを防止する提案がなされている。
Therefore, in Patent Document 4, a thin film made of an oxide of a rare earth metal constituting a metal halide sealed in a discharge vessel on the surface of a plug made of Nb or an alloy thereof, and on the surface of a welded portion between the plug and the electrode. Has been proposed to prevent Nb from forming a low melting point alloy with a W or Mo electrode.
図６は電極の外周に冷却用のコイルを巻回した従来の状態の拡大図であり、この図から分かるように、コイルをどのように緻密に巻回したとしても電極とコイルとの間には隙間が形成され、この隙間は螺旋状をなし、放電空間に臨む部分から栓体との溶接部まで連続する。このため、前記の隙間を伝って、メタルハライドがＮｂの栓体まで届いてしまい、前記したと同様の不具合が発生する。この不具合は上述した特許文献では解消できない問題である。
FIG. 6 is an enlarged view of a conventional state in which a cooling coil is wound around the outer periphery of the electrode, and as can be seen from this figure, no matter how densely the coil is wound, it is between the electrode and the coil. A gap is formed, and this gap has a spiral shape and continues from a portion facing the discharge space to a welded portion with the plug. For this reason, the metal halide reaches the Nb plug through the gap, and the same problem as described above occurs. This problem is a problem that cannot be solved by the above-mentioned patent document.
上記課題を解決するべく本発明は、ニオブ（Ｎｂ）またはその合金類からなる栓体にタングステン（Ｗ）またはモリブデン（Ｍｏ）からなる電極を溶接してなる電極ユニットを、セラミックス製放電容器の両端部に設けた封止部位に挿通し、前記封止部位と栓体との間にフリットガラスを充填するとともに前記電極の外側にコイルを巻回したＨＩＤランプにおいて、前記電極とコイルとの間に形成される隙間には放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の酸化物を充填した。ここで、充填に関しては完全に隙間を埋める場合の他、多少隙間が残っても十分に効果を発揮することが期待できるので、本発明の充填は多少隙間が残っている場合も含むものとする。
In order to solve the above-mentioned problems, the present invention provides an electrode unit formed by welding an electrode made of tungsten (W) or molybdenum (Mo) to a plug made of niobium (Nb) or an alloy thereof, at both ends of a ceramic discharge vessel. In an HID lamp that is inserted into a sealing portion provided in a section, filled with frit glass between the sealing portion and a plug, and wound around the outside of the electrode, between the electrode and the coil The gap formed was filled with an oxide of a rare earth metal constituting a compound (metal halide) of a rare earth metal and a halogen sealed in the discharge vessel. Here, as for filling, in addition to completely filling the gap, it can be expected that a sufficient effect is exhibited even if some gaps remain. Therefore, the filling of the present invention includes cases where some gaps remain.
電極とコイルとの間に形成される隙間に希土類金属の酸化物を充填するには、最初に電極の外周に希土類金属の酸化物の膜を形成し、その膜の上からコイルをきつく巻いて膜にコイルの一部を食い込ませるようにすれば良い。
To fill the gap formed between the electrode and the coil with rare earth metal oxide, first form a rare earth metal oxide film on the outer periphery of the electrode, and then wind the coil tightly over the film What is necessary is just to make a part of a coil bite into a film | membrane.
また、電極とコイルとの間に形成される隙間だけでなく、電極ユニットの外周面で栓体と電極との溶接部を跨ぐ領域に、放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の酸化物の被膜を形成すれば更に効果は向上する。
In addition to the gap formed between the electrode and the coil, a compound of rare earth metal and halogen enclosed in the discharge vessel in a region straddling the welded portion between the plug and the electrode on the outer peripheral surface of the electrode unit The effect is further improved by forming a film of an oxide of a rare earth metal constituting (metal halide).
前記希土類金属としてはディスプロシウム（Ｄｙ）、スカンジウム（Ｓｃ）、ネオジウム（Ｎｄ）、ユロピウム（Ｅｕ）、ホルミウム（Ｈｏ）、ツリウム（Ｔｍ）またはイッテルビウム（Ｙｂ）の複合物、もしくは単体が挙げられる。また前記薄膜の形成方法としては、ディップ法、溶射法、ＣＶＤ法、ガスデポジション法などが採用できる。
Examples of the rare earth metal include dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm), ytterbium (Yb), or a simple substance. . Further, as a method for forming the thin film, a dipping method, a thermal spraying method, a CVD method, a gas deposition method, or the like can be employed.
本発明に係るＨＩＤランプでは、メタルハライドがニオブ(Ｎｂ)を含む栓体まで届きにくいので、置換反応によってニオブ(Ｎｂ)が解離し、タングステン(Ｗ)またはモリブデン(Ｍｏ)などの電極部材と低融点の合金を形成することを阻止でき、寿命を大幅に改善できる。
In the HID lamp according to the present invention, since the metal halide does not easily reach the plug containing niobium (Nb), the niobium (Nb) is dissociated by the substitution reaction, and the electrode member such as tungsten (W) or molybdenum (Mo) has a low melting point. It is possible to prevent the alloy from being formed, and the life can be greatly improved.
以下に本発明の実施の形態を添付図面に基づいて説明する。ここで、図１は本発明に係るＨＩＤランプを組み込んだ照明器具の全体図、図２は本発明に係るＨＩＤランプの要部断面図、図３（ａ）は電極外周面に希土類金属酸化物の薄膜を形成している状態を示す図、（ｂ）は電極外周面にコイルを巻回した状態を示す図、図４は図３（ｂ）の要部拡大図である。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is an overall view of a luminaire incorporating the HID lamp according to the present invention, FIG. 2 is a cross-sectional view of the main part of the HID lamp according to the present invention, and FIG. The figure which shows the state which forms the thin film of this, (b) is a figure which shows the state which wound the coil around the electrode outer peripheral surface, FIG. 4 is the principal part enlarged view of FIG.3 (b).
図１に示す照明器具は前面ガラスが不要な３重管構造をなし、外側管１内に内側管２を配置し、この内側管２の中に本発明に係るＨＩＤランプ３を組み込み、口金４から延び導電体５、６をそれぞれＨＩＤランプ３の電極ユニット７、８に接続している。
The lighting apparatus shown in FIG. 1 has a triple tube structure that does not require a front glass, and an inner tube 2 is disposed in the outer tube 1. The HID lamp 3 according to the present invention is incorporated in the inner tube 2, and a base 4 The conductors 5 and 6 are connected to the electrode units 7 and 8 of the HID lamp 3, respectively.
電極ユニット７、８はニオブ（Ｎｂ）またはその合金からなる栓体７ａ、８ａにタングステン（Ｗ）またはモリブデン（Ｍｏ）からなる電極７ｂ、８ｂを溶接して構成される。この実施例では栓体７ａ、８ａと電極７ｂ、８ｂとを凹凸嵌合させた状態で外側からレーザー溶接している。
The electrode units 7 and 8 are configured by welding electrodes 7b and 8b made of tungsten (W) or molybdenum (Mo) to plugs 7a and 8a made of niobium (Nb) or an alloy thereof. In this embodiment, the plugs 7a and 8a and the electrodes 7b and 8b are laser-welded from the outside in a state where the concave and convex portions are fitted.
ＨＩＤランプ３の放電容器はシリカやアルミナセラミックスを材料とし、中央部を発光部３ａ、両端部を封止部位３ｂとし、発光部３ａ内にはレアアースガスとして、窒素、アルゴン、クリプトン、キセノン、水銀、ナトリウムのハロゲン化物、その他に希土類金属（Ｄｙ）等、複数種類のハロゲン化物（主にヨウ化物）が封入される。
The discharge vessel of the HID lamp 3 is made of silica or alumina ceramics, the central part is a light emitting part 3a, both ends are sealed parts 3b, and the rare earth gas in the light emitting part 3a is nitrogen, argon, krypton, xenon, mercury. , Sodium halides, and other types of halides (mainly iodides) such as rare earth metals (Dy) are encapsulated.
封止部位３ｂには封止材料（フリットガラス）９を介して前記Ｎｂ（ニオブ）製の栓体７ａ、８ａが気密に保持され、前記封止材料９としては例えば１５００℃強に軟化点(粘性が著しく低くなる)を有するＤｙ２Ｏ３－ＳｉＯ２－Ａｌ２Ｏ３系フリットガラスを用いる。
Nb (niobium) plugs 7a and 8a are hermetically held in the sealing portion 3b through a sealing material (frit glass) 9, and the sealing material 9 has a softening point (for example, slightly higher than 1500 ° C.). Dy 2 O 3 —SiO 2 —Al 2 O 3 based frit glass having a significantly lower viscosity) is used.
前記電極７ｂ、８ｂの先端部には冷却用のコイル１０が巻回され、電極７ｂ、８ｂの中間部から溶接部にかけて冷却用のコイル１１が巻回され、更に、コイル１１と電極７ｂ、８ｂとの隙間には、放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の酸化物として、Ｄｙ２Ｏ３が充填されている。
A cooling coil 10 is wound around the distal ends of the electrodes 7b and 8b, a cooling coil 11 is wound from the intermediate portion of the electrodes 7b and 8b to the welded portion, and the coil 11 and the electrodes 7b and 8b. Is filled with Dy 2 O 3 as an oxide of a rare earth metal constituting a compound of rare earth metal and halogen (metal halide) sealed in the discharge vessel.
Ｄｙ２Ｏ３を充填するには、例えば図３（ａ）に示すようにノズル１３からＤｙ２Ｏ３の微粉体を高速で噴出して、常温下で電極７ｂ、８ｂの表面にＤｙ２Ｏ３膜１２を形成し、次いで（ｂ）に示すように、Ｄｙ２Ｏ３膜１２の外側からコイル１１を強く巻回し、コイル１１がＤｙ２Ｏ３膜１２に食い込むように巻回する。その結果、図４に示すように、コイル１１と電極７ｂ、８ｂとの隙間がＤｙ２Ｏ３で充填される。このようにＤｙ２Ｏ３が緻密に充填されているので、希土類金属の蒸気がＮｂ製の栓体７ａ，８ａまで到達できす、置換反応が起こらない。
In order to fill Dy 2 O 3 , for example, as shown in FIG. 3A, a fine powder of Dy 2 O 3 is ejected from the nozzle 13 at a high speed, and the surface of the electrodes 7b and 8b is Dy 2 O at room temperature. 3 film 12 is formed, and then as shown in (b), Dy 2 O 3 Turn strongly wound from the outer coil 11 of the film 12, the coil 11 is wound so as to bite into the Dy 2 O 3 film 12. As a result, as shown in FIG. 4, the gap between the coil 11 and the electrodes 7b and 8b is filled with Dy 2 O 3 . Since Dy 2 O 3 is densely packed in this way, the rare earth metal vapor can reach the Nb plugs 7a and 8a, and no substitution reaction occurs.
希土類金属の酸化物の膜を形成する方法は上記に限らず、溶射法、ＣＶＤ、サンドブラスト、ディップ塗布法など任意で良い。何れの方法を採用するにしても、膜の厚みは電極の直径が０．７ｍｍφの場合には３０μｍ以下とすることが望ましい。
The method of forming the rare earth metal oxide film is not limited to the above, and any method such as thermal spraying, CVD, sandblasting, dip coating may be used. Whichever method is adopted, the thickness of the film is preferably 30 μm or less when the electrode diameter is 0.7 mmφ.
図５は別実施例を示す図３（ｂ）と同様の図であり、この実施例にあっては、栓体７ａ、８ａと電極７ｂ、８ｂとの溶接部を跨ぐ領域に、放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の膜、例えばＤｙ２Ｏ３膜１４を形成している。この場合も膜１４の厚みは電極の直径が０．７ｍｍφの場合には３０μｍ以下とすることが望ましい。
FIG. 5 is a view similar to FIG. 3B showing another embodiment. In this embodiment, in the region across the welded portion between the plug bodies 7a, 8a and the electrodes 7b, 8b, A rare earth metal film, for example, a Dy 2 O 3 film 14 constituting a compound (metal halide) of a rare earth metal and a halogen sealed in is formed. Also in this case, the thickness of the film 14 is preferably 30 μm or less when the electrode diameter is 0.7 mmφ.
このように、Ｄｙ２Ｏ３膜１４を形成することで、コイル１１と電極７ｂ、８ｂの外側面との隙間のみならず、コイル１１と封止部位３ｂ内側面との隙間を介して、希土類金属とＮｂとの置換を防止でき、その結果、遊離したＮｂがタングステン電極の先端まで移動して融点の低い合金を創ることを防止できる。
In this way, by forming the Dy 2 O 3 film 14, not only the gap between the coil 11 and the outer surface of the electrodes 7b and 8b but also the rare earth through the gap between the coil 11 and the inner surface of the sealing portion 3b. Substitution of metal and Nb can be prevented, and as a result, liberated Nb can be prevented from moving to the tip of the tungsten electrode to create an alloy having a low melting point.
１…外側管、２…内側管、３…ＨＩＤランプ、３ａ…発光部、３ｂ…封止部位、４…口金、５，６…導電体、７，８…電極ユニット、７ａ、８ａ…栓体、７ｂ、８ｂ…電極、９…封止材料、１０、１１…電極に巻回されたコイル、１２，１４…Ｄｙ２Ｏ３膜、１３…ノズル。
DESCRIPTION OF SYMBOLS 1 ... Outer tube, 2 ... Inner tube, 3 ... HID lamp, 3a ... Light emission part, 3b ... Sealing part, 4 ... Base, 5, 6 ... Conductor, 7, 8 ... Electrode unit, 7a, 8a ... Plug body , 7b, 8b ... electrode, 9 ... sealing material, 10, 11 ... coil wound electrodes, 12, 14 ... Dy 2 O 3 film, 13 ... nozzle.
Claims (3)
- ニオブ（Ｎｂ）またはその合金からなる栓体にタングステン（Ｗ）またはモリブデン（Ｍｏ）からなる電極を溶接してなる電極ユニットを、セラミックス製放電容器の両端部に設けた封止部位に挿通し、前記封止部位と栓体との隙間にフリットガラスを充填するとともに前記電極の外側にコイルを巻回したＨＩＤランプにおいて、前記電極とコイルとの間に形成される隙間には放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の酸化物類が充填されていることを特徴とするＨＩＤランプ。 An electrode unit formed by welding an electrode made of tungsten (W) or molybdenum (Mo) to a plug made of niobium (Nb) or an alloy thereof is inserted into sealing portions provided at both ends of a ceramic discharge vessel, In an HID lamp in which a gap between the sealing portion and the plug is filled with frit glass and a coil is wound around the electrode, the gap formed between the electrode and the coil is enclosed in a discharge vessel. A rare earth metal oxide composing a rare earth metal and halogen compound (metal halide) is filled.
- 請求項１に記載のＨＩＤランプにおいて、前記電極ユニットの外周面で栓体と電極との溶接部を跨ぐ領域に、放電容器内に封入される希土類金属とハロゲンとの化合物(メタルハライド)を構成する希土類金属の酸化物類からなる薄膜が形成されていることを特徴とするＨＩＤランプ。 The HID lamp according to claim 1, wherein a compound (metal halide) of a rare earth metal and a halogen enclosed in a discharge vessel is formed in a region straddling a welded portion between the plug and the electrode on the outer peripheral surface of the electrode unit. A HID lamp characterized in that a thin film made of rare earth metal oxides is formed.
- 請求項１または請求項２に記載のＨＩＤランプにおいて、前記希土類金属としてはディスプロシウム（Ｄｙ）、スカンジウム（Ｓｃ）、ネオジウム（Ｎｄ）、ユロピウム（Ｅｕ）、ホルミウム（Ｈｏ）、ツリウム（Ｔｍ）またはイッテルビウム（Ｙｂ）の混合物もしくは単体であることを特徴とするＨＩＤランプ。 3. The HID lamp according to claim 1, wherein the rare earth metal includes dysprosium (Dy), scandium (Sc), neodymium (Nd), europium (Eu), holmium (Ho), thulium (Tm). An HID lamp characterized by being a mixture or a simple substance of ytterbium (Yb).
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| JP2008176415A JP2010015911A (en) | 2008-07-07 | 2008-07-07 | Hid lamp |
| JP2008-176415 | 2008-07-07 |
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|---|---|---|---|---|
| JP3995053B1 (en) * | 2007-06-18 | 2007-10-24 | 育宏 加藤 | HID lamp |
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| JP3995053B1 (en) * | 2007-06-18 | 2007-10-24 | 育宏 加藤 | HID lamp |
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