WO2010010759A1 - 高圧放電ランプ用電極、高圧放電ランプ及び高圧放電ランプ用電極の製造方法 - Google Patents
高圧放電ランプ用電極、高圧放電ランプ及び高圧放電ランプ用電極の製造方法 Download PDFInfo
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- WO2010010759A1 WO2010010759A1 PCT/JP2009/060494 JP2009060494W WO2010010759A1 WO 2010010759 A1 WO2010010759 A1 WO 2010010759A1 JP 2009060494 W JP2009060494 W JP 2009060494W WO 2010010759 A1 WO2010010759 A1 WO 2010010759A1
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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
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes
Definitions
- the present invention relates to an electrode structure of a high pressure discharge lamp. More specifically, the present invention relates to an electrode structure for preventing deformation of an electrode coil in a high-pressure discharge lamp used for a projector.
- FIG. 9 is a diagram showing the structure of a high-pressure discharge lamp such as a general ultra-high pressure mercury lamp.
- the high-pressure discharge lamp 6 includes a light emitting tube 2 made of quartz glass, an electrode 7 disposed facing the light emitting portion 2a of the light emitting tube 2 at an interval of 1.5 mm or less, and a molybdenum foil 4 disposed on the sealing portion 2b of the light emitting tube 2.
- a power supply lead 5 connected to the molybdenum foil 4, and the light emitting portion 2a has a mercury of 0.15 mg / mm 3 or more and a range of 10 ⁇ 5 ⁇ mol / mm 3 to 10 ⁇ 2 ⁇ mol / mm 3 .
- bromine is enclosed.
- FIGS. 10A and 10B are sectional views showing the structure of the electrode 7 in the high-pressure discharge lamp of FIG.
- the electrode 7 is composed of an electrode core rod 70 and a coil 75 coated thereon.
- a coil 75 is coated on the tip end side of the electrode core rod 70, and the tip ends of the electrode core rod 70 and the coil 75 are melted to form a dome-shaped tip portion.
- the electrode core rod 70 is composed of a small diameter portion 71 and a large diameter portion 72, and a coil 75 is coated on the distal end side of the large diameter portion 72, and the large diameter portion 72 and the distal end of the coil 75 are melted.
- a dome-shaped tip is formed.
- an electrode coil has a function of adjusting the temperature of an electrode, and this determines the discharge state, discharge characteristics, and the like.
- the electrode temperature when the lamp is lit becomes a high temperature exceeding 2000 ° C.
- the coil 75 is also thermally affected.
- the coil 75 causes a springback at a high temperature and spreads in the direction of the molybdenum foil 4 (right side in FIG. 10).
- the coil 75 for adjusting the electrode temperature is deformed with the lighting time, so that the temperature condition of the electrode is also changed, and there is a problem that discharge characteristics and the like vary among individuals.
- Patent Document 1 discloses a configuration in which a coil and a small diameter portion (shaft bar) are integrated by melting. Specifically, as disclosed in FIG. 4 of the drawing, a coil (54) is wound around a shaft rod (50) in a tapered shape, and the tip portion (20) is formed by melting the tapered portion. In addition, as disclosed in FIG. 9 of the same document, a configuration is disclosed in which not only the front end side (122) of the coil but also the terminal end side (124) is melted to the shaft rod (126).
- Patent Document 1 Although the effect of preventing the springback can be expected, a high level of technology is required for winding the coil in a tapered shape. Therefore, there was a problem that productivity was poor and it was not suitable for mass production.
- the terminal position of the coil depends on the accuracy of the melt processing, there is a problem that the terminal positioning accuracy is low. For example, in the melting process of the coil end, it is expected that the end is fixed in a state where the coil is somewhat extended by the heat of fusion. Further, there is a concern that the core rod is recrystallized by the applied heat, and the electrode breaks due to the strength of the portion being lowered.
- an object of the present invention is to provide an electrode for a high-pressure discharge lamp that can prevent spring back of the electrode coil, has high productivity, and has high positioning accuracy at the end of the coil.
- the first aspect of the present invention is a high pressure discharge lamp electrode comprising an electrode core rod (30) and a coil (35) covered with the electrode core rod, wherein the electrode core rod has a small diameter portion ( 31) and a large-diameter portion (32) on the distal end side.
- the large-diameter portion has a large-diameter portion (32a) on the small-diameter portion side, and has an outer diameter smaller than the large-diameter portion and a step (S).
- the electrode for a high-pressure discharge lamp has a small diameter portion (32b) and a tip portion (32c) to be formed, and a coil is covered between the step and the tip portion.
- the second aspect of the present invention is an electrode for a high-pressure discharge lamp comprising an electrode core rod (30) and a coil (35) covered with the electrode core rod, wherein the electrode core rod has a small diameter portion ( 31) and a large-diameter portion (32) on the distal end side, the large-diameter portion has a tapered portion (32d) and a distal end portion (32c) that become narrower from the small-diameter portion side toward the distal end side, and the coil is It is an electrode for a high-pressure discharge lamp covered with a tapered portion.
- the small diameter portion (32b) or the tapered portion (32d) is formed by cutting.
- the tip of the large diameter portion (32) and the tip of the coil (35) are melted to form the tip (32c).
- a high-pressure discharge lamp (1) comprising an arc tube (2) and a pair of high-pressure discharge lamp electrodes (3) of the first or second side faced in the arc tube. ).
- a fourth aspect of the present invention is a method for manufacturing an electrode for a high-pressure discharge lamp, the step of cutting the distal end side of a large-diameter portion of an electrode core rod composed of a small-diameter portion and a large-diameter portion (S110, S210),
- This is a manufacturing method comprising a step of covering the cut portion with a coil (S120, S220) and a step of melting the tip of the large diameter portion and the tip of the coil to form the tip portion (S130, S230).
- the machined portion may have a constant outer diameter, or may have a tapered shape that narrows toward the tip side.
- FIG. 1 shows a high-pressure discharge lamp 1 of the present invention.
- the high-pressure discharge lamp 1 is different from the conventional example in FIG. 9 only in the structure of the electrode 3, and the arc tube 2, the molybdenum foil 4 and the lead 5 and their overall configuration are the same as those in FIG. To do.
- FIG. 2 is a cross-sectional view showing the structure of the electrode 3 of the first embodiment.
- the electrode 3 is composed of an electrode mandrel 30 and a coil 35.
- the electrode core 30 is composed of a small diameter portion 31 on the power feeding side and a large diameter portion 32 on the distal end side.
- the large diameter portion 32 is a large diameter portion 32a, a small diameter portion 32b and a distal end.
- the coil 35 is covered with the small diameter portion 32b. Accordingly, the movement of the coil 35 in the direction of the small diameter portion 31 (right direction in the drawing) is restricted by the step S between the large diameter portion 32a and the small diameter portion 32b.
- FIG. 3 shows a method for manufacturing the electrode of FIG.
- step S100 an electrode core bar composed of the small diameter portion 31 and the large diameter portion 32 as shown in FIG. 4A is produced.
- step S110 as shown in FIG. 4B, the large diameter portion 32 is cut to form the small diameter portion 32b, and the step S with the large diameter portion 32a is formed.
- step S120 as shown in FIG. 4C, the coil 35 is covered with the small diameter portion 32b, and the end position is determined by the step S.
- the small-diameter portion 32b of the coil 35 may be covered by inserting a previously wound air-core coil 35 into the small-diameter portion 32b and stopping at the step S.
- the wire may be wound around the small diameter portion 32b.
- the mounting of the coil is expressed as “cover” including the case of “insertion” and the case of “winding”.
- step S130 the tip of the small diameter portion 32b and the tip of the coil 35 are melted to form a dome-like tip 32c as shown in FIG. 4D.
- 4A to 4D are schematic diagrams for explanation, and the dimensions of each part, the number of turns of the coil, and the like are not limited to those illustrated.
- the end of the coil 35 is fixed by the step S, and spring back is prevented. Thereby, the behavior of discharge can be stabilized over the lifetime. Further, in the above manufacturing method, each step is suitable for mass production, and the melting step is only required once in step S130, so that high production efficiency or mass productivity can be ensured. In addition, since the end position of the coil 35 is determined by a cutting process capable of positioning with high accuracy, it is possible to eliminate variations between solids due to the end position.
- FIG. 5 is a sectional view showing the structure of the electrode 3 of the second embodiment.
- the electrode 3 is composed of an electrode core 30 and a coil 35.
- the electrode core 30 is composed of a small diameter portion 31 on the power supply side and a large diameter portion 32 on the tip side, and the large diameter portion 32 is composed of a taper portion 32d and a tip portion 32c.
- the coil 35 is covered on the tip end side of the tapered portion 32d.
- the taper portion 32d restricts the movement of the coil 35 in the direction of the small diameter portion 31 (right direction in the drawing).
- FIG. 6 shows a method for manufacturing the electrode of FIG.
- step S200 an electrode core bar composed of the small diameter portion 31 and the large diameter portion 32 as shown in FIG. 7A is produced and provided.
- step S210 as shown in FIG. 7B, the large diameter portion 32 is cut to form a tapered portion 32d.
- step S220 as shown in FIG. 7C, the coil 35 is covered with the tapered portion 32d.
- the taper portion 32d of the coil 35 may be covered by inserting the air-core coil 35 wound up in advance into the shape matched to the taper portion 32d into the taper portion 32d.
- a coil wire may be wound around the tapered portion 32d.
- step S230 the tip of the tapered portion 32d and the tip of the coil 35 are melted to form a dome-shaped tip 32c as shown in FIG. 7D.
- 7A to 7D are schematic diagrams for explanation, and the dimensions of each part, the number of turns of the coil, and the like are not limited to those illustrated.
- each step is suitable for mass production, and the melting step is only required once in step S230, so that high production efficiency or mass productivity can be ensured.
- a large diameter portion 32 may be configured with a large diameter portion 32a and a small diameter portion 32b, and the large diameter portion 32a may be tapered.
- the tapered portion 32 d may be provided in a part of the large diameter portion 32. The effects obtained by both are the same as in the first or second embodiment.
- a plurality of large-diameter portions 32a and small-diameter portions 32b may be provided on the large-diameter portion, and each small-diameter portion may be covered with a coil, or as shown in the cross-sectional view of FIG.
- a plurality of tapered portions 32d may be provided on the large-diameter portion, and each tapered portion may be covered with a coil. In these cases, the coil is covered by winding.
- the production efficiency is high and the configuration is suitable for mass production, and the spring back of the electrode coil can be reliably prevented.
- the coil end position is determined by a cutting process capable of positioning with higher accuracy than the melt process, it is possible to eliminate variations among individuals due to the end position.
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- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
Abstract
Description
一般に、電極コイルは電極の温度を調整する機能を持ち、これによって放電状態、放電特性等が決まる。
また、コイルの終端位置が溶融加工の精度に依存するので終端の位置決め精度が低いという問題もあった。例えば、コイル終端の溶融工程において、コイルが溶融熱で多少延びた状態で終端が固定されてしまうことが予想される。また、加えられた熱で芯棒が再結晶化して、その部位の強度が低下することによる電極折れが危惧される。
また、太径部(32)の先端とコイル(35)の先端とが溶融されて先端部(32c)が形成される構成とした。
工程S100において、図4Aのような細径部31及び太径部32からなる電極芯棒が作製される。
工程S110において、図4Bのように、太径部32が切削加工されて小径部32bが形成され、大径部32aとの段差Sが形成される。
ここで、工程S120において、コイル35の小径部32bへの被覆は、予め巻きあげられた空芯状のコイル35を小径部32bに挿入して段差Sで止まるようにしてもよいし、コイル用の線材を小径部32bに巻き付けるようにしてもよい。
なお、本明細書ではコイルの装着について、上記の「挿入」の場合と「巻付け」の場合を含めて「被覆」と表現している。
上記の各工程の結果として、コイル35が段差Sと先端部32cによって挟みこまれた構成の電極が製造される。
なお、図4A-Dの各図は説明のための模擬的な図であり、各部位の寸法やコイルの巻数等は図示したものに限られない。
また、上記の製造方法においては、各工程はいずれも量産に適したものであり、しかも溶融工程が工程S130の1回のみで済むので、高い生産効率ないしは量産性を担保することができる。
また、コイル35の終端位置が、高精度な位置決めが可能な切削加工によって決まるので、その終端位置に起因する固体間のばらつきをなくすことができる。
工程S200において、図7Aのような細径部31及び太径部32からなる電極芯棒が作製・提供される。
工程S210において、図7Bのように、太径部32に切削加工が施されてテーパー部32dが形成される。
なお、工程S220において、コイル35のテーパー部32dへの被覆は、予めテーパー部32dに合わせた形状に巻きあげられた空芯状のコイル35をテーパー部32dに挿入するようにしてもよいし、コイル用の線材をテーパー部32dに巻き付けるようにしてもよい。
なお、図7A-Dの各図は説明のための模擬的な図であり、各部位の寸法やコイルの巻数等は図示したものに限られない。
また、上記の製造方法においては、各工程はいずれも量産に適したものであり、しかも溶融工程が工程S230の1回のみで済むので、高い生産効率ないしは量産性を担保することができる。
なお、電極3の構造として、実施例1で示した段差を設ける構成と実施例2で示したテーパーを設ける構成とを適宜組み合わせて種々の変形例を構成できる。即ち、コイルの終端部の(細径部方向への)移動が太径部における段差又はテーパーによって規制されていれば本発明の目的は達成できる。
また、図8Bの断面図に示すように、テーパー部32dを太径部32の一部に設けてもよい。
双方とも得られる効果は上記第1又は第2の実施例と同様である。
なお、変形例は図8A-Dに示すものに限られない。
また、溶融加工よりも高精度な位置決めが可能な切削加工によってコイル終端位置が決まるので、その終端位置に起因する個体間のばらつきをなくすことができる。
2.発光管
2a.発光部
2b.封止部
3.電極
4.モリブデン箔
5.リード
30.電極芯棒
31.細径部
32.太径部
32a.大径部
32b.小径部
32c.先端部
32d.テーパー部
35.コイル
S:段差
Claims (8)
- 電極芯棒及び該電極芯棒に被覆されるコイルからなる高圧放電ランプ用電極であって、
前記電極芯棒が、給電側の細径部及び先端側の太径部からなり、
前記太径部が、前記細径部側の大径部、該大径部よりも外径が小さく該大径部と段差を形成する小径部、及び先端部を有し、前記コイルが前記段差と前記先端部の間に被覆された高圧放電ランプ用電極。 - 電極芯棒及び該電極芯棒に装着されるコイルからなる高圧放電ランプ用電極であって、
前記電極芯棒が、給電側の細径部及び先端側の太径部からなり、
前記太径部が、前記細径部側から先端側に向けて細くなるテーパー部、及び先端部を有し、前記コイルが前記テーパー部に被覆された高圧放電ランプ用電極。 - 請求項1又は2記載の高圧放電ランプ用電極において、前記小径部又は前記テーパー部が切削加工によって形成された高圧放電ランプ用電極。
- 請求項1又は2記載の高圧放電ランプ用電極において、前記太径部の先端と前記コイルの先端とが溶融されて前記先端部が形成された高圧放電ランプ用電極。
- 発光管、及び該発光管内に対向配置された一対の請求項1から4いずれか一項に記載の高圧放電ランプ用電極を備えた高圧放電ランプ。
- 高圧放電ランプ用電極の製造方法であって、
細径部及び太径部からなる電極芯棒の該太径部先端側を切削加工する工程、
前記切削加工された部分にコイルを被覆する工程、及び
前記太径部の先端及び前記コイルの先端を溶融して先端部を形成する工程
からなる製造方法。 - 請求項6記載の製造方法において、前記切削加工された部分が一定の外径を有している製造方法。
- 請求項6記載の製造方法において、前記切削加工された部分が先端側に向けて細くなるテーパー形状をなしている製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09800275A EP2309532A4 (en) | 2008-07-25 | 2009-06-09 | ELECTRODE FOR HIGH PRESSURE DISCHARGE LAMP, HIGH PRESSURE DISCHARGE LAMP, AND ELECTRODE MANUFACTURING METHOD FOR SAME |
CA2731648A CA2731648C (en) | 2008-07-25 | 2009-06-09 | Electrode for high pressure discharge lamp, high pressure discharge lamp, and method for manufacturing electrode for high pressure discharge lamp |
CN2009801290865A CN102105962A (zh) | 2008-07-25 | 2009-06-09 | 用于高压放电灯的电极,高压放电灯及用于高压放电灯的电极的制造方法 |
US13/054,872 US8159135B2 (en) | 2008-07-25 | 2009-06-09 | Electrode for high pressure discharge lamp, high pressure discharge lamp, and method for manufacturing electrode for high pressure discharge lamptechnical field |
Applications Claiming Priority (2)
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JP2008-191786 | 2008-07-25 | ||
JP2008191786A JP5309754B2 (ja) | 2008-07-25 | 2008-07-25 | 高圧放電ランプ用電極、高圧放電ランプ及び高圧放電ランプ用電極の製造方法 |
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WO2010010759A1 true WO2010010759A1 (ja) | 2010-01-28 |
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PCT/JP2009/060494 WO2010010759A1 (ja) | 2008-07-25 | 2009-06-09 | 高圧放電ランプ用電極、高圧放電ランプ及び高圧放電ランプ用電極の製造方法 |
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US (1) | US8159135B2 (ja) |
EP (1) | EP2309532A4 (ja) |
JP (1) | JP5309754B2 (ja) |
CN (1) | CN102105962A (ja) |
CA (1) | CA2731648C (ja) |
WO (1) | WO2010010759A1 (ja) |
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CN106356278A (zh) * | 2016-08-15 | 2017-01-25 | 广州莱拓浦电子有限公司 | 一种钨电极及采用所述钨电极的高压水银放电灯 |
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2008
- 2008-07-25 JP JP2008191786A patent/JP5309754B2/ja not_active Expired - Fee Related
-
2009
- 2009-06-09 WO PCT/JP2009/060494 patent/WO2010010759A1/ja active Application Filing
- 2009-06-09 CA CA2731648A patent/CA2731648C/en not_active Expired - Fee Related
- 2009-06-09 CN CN2009801290865A patent/CN102105962A/zh active Pending
- 2009-06-09 US US13/054,872 patent/US8159135B2/en not_active Expired - Fee Related
- 2009-06-09 EP EP09800275A patent/EP2309532A4/en not_active Withdrawn
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US8159135B2 (en) | 2012-04-17 |
CA2731648C (en) | 2013-11-12 |
CA2731648A1 (en) | 2010-01-28 |
CN102105962A (zh) | 2011-06-22 |
EP2309532A4 (en) | 2011-11-16 |
EP2309532A1 (en) | 2011-04-13 |
JP2010033733A (ja) | 2010-02-12 |
US20110121725A1 (en) | 2011-05-26 |
JP5309754B2 (ja) | 2013-10-09 |
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