EP1861862B1 - Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode - Google Patents
Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode Download PDFInfo
- Publication number
- EP1861862B1 EP1861862B1 EP06706032A EP06706032A EP1861862B1 EP 1861862 B1 EP1861862 B1 EP 1861862B1 EP 06706032 A EP06706032 A EP 06706032A EP 06706032 A EP06706032 A EP 06706032A EP 1861862 B1 EP1861862 B1 EP 1861862B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- lamp
- discharge
- producing
- discharge lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 230000005855 radiation Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 239000011888 foil Substances 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 230000002277 temperature effect Effects 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000156 glass melt Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
- H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
-
- 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
-
- 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
-
- 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
Definitions
- the invention relates to a method for producing an electrode according to the preamble of patent claim 1.
- Such electrodes provided with an electrode tip are used, for example, in discharge lamps.
- the process for producing electrodes consists essentially of powder metallurgy production of an electrode blank, a sintering process and the subsequent mechanical deformation of the blank to the desired electrode diameter.
- the forming of the blanks takes place for example by rolling on a multi-roll or by hammering on rotary hammers.
- the diameter of the blank is reduced with simultaneous elongation of the material.
- the billet diameter is further reduced from about 4 mm by a drawing process.
- the applicant known to form the electrode tip by radial forming, for example by means of profiled hammers baking.
- This solution enables a grain boundary structure following the contour of the electrode tip, since the electrode tip is not produced by mechanical or chemical removal.
- a disadvantage of such electrodes is that the final microstructure and purity of the electrode tip is achieved only during operation of the lamp due to a recrystallization of the structure caused by the effect of the temperature of the gas discharge. That is, at the beginning of the operating life of such electrodes have a long-crystalline, fibrous microstructure, which lead to poor ignition properties and an unfavorable arch approach.
- the EP 1 148 534 A1 discloses a rod-shaped electrode for a discharge lamp whose discharge-side end is covered with a coil. This helix is fused to the hemispherical end of the electrode.
- the invention has for its object to provide a method for producing an electrode or power supply and a lamp with such an electrode or power supply, in which compared to conventional solutions improved performance is possible.
- the microstructure of at least one section of the electrode is at least partially converted by means of high-energy radiation, preferably laser radiation. Due to the temperature effect of the high-energy radiation on this electrode section, the fibrous, long-crystalline structural regions combine to form compact, dense units-in other words-a defined recrystallization of the microstructure of the electrode segment takes place. This recrystallization causes a coarsely crystalline structure in the region of this elec trodenabitess. As a result, this electrode section has a microstructure and purity substantially corresponding to the operating state of the lamp.
- the abovementioned electrode section preferably comprises the discharge-side end of the electrode.
- the aforementioned microstructure of the discharge-side end of the electrode remains stable during operation of the lamp and it ensures good ignition properties and a good bow approach. This allows the electrode tip according to the invention opposite the prior art according to the EP 0 858 098 B1 already at the beginning of the life of the lamp an optimal ignition behavior and a good arc formation. Furthermore, a high purity of the electrode is achieved due to the influence of temperature.
- the crystal structure is consistently converted.
- a defined, coarse-grained microstructure surface of the electrode section is present.
- the structure of at least a portion of the power supply by means of high-energy radiation, preferably laser radiation, at least partially converted for example, by means of the high-energy radiation, a surface portion of the power supply is treated, for example, to evaporate adhering to the surface impurities or to smooth the surface of the power supply or to convert the crystal structure of the power supply to its surface, thereby improving the so-called glazing behavior of the power supply, that is, to reduce the adhesion of the power supply to the surrounding glass of the lamp vessel and thus the risk of cracking in the lamp vessel due to different thermal expansion coefficients of glass and power supply material.
- the power supply is preferably formed as a wire of molybdenum, tungsten or an alloy of molybdenum or tungsten.
- a discharge lamp produced according to the invention has at least one electrode and at least one power supply, wherein the structure of at least a portion of the electrode or the power supply by means of high-energy radiation, preferably laser radiation, at least partially converted.
- an electrode section has a structure substantially corresponding to the operating state of the discharge lamp.
- this electrode section has a coarsely crystalline structure.
- this electrode section has a purity substantially corresponding to the operating state of the lamp.
- blackening in the discharge vessel is reduced to a minimum and the service life of the discharge lamp is substantially extended.
- this electrode section is produced by means of high-energy radiation, preferably laser radiation.
- the aforementioned electrode section is the discharge-side end of the electrode.
- the invention is preferably applied to rod-shaped tungsten electrodes, in particular for high-pressure discharge lamps.
- the lamp shown is a high-pressure discharge lamp 1, as used for example in vehicle headlights or projectors use.
- This has a discharge vessel 2 made of quartz glass with an interior 4 and two diametrically arranged, sealed end sections 6, 8, which are formed as Glaseinschmelzonne 10, 12 and each having a power supply 14 which embedded with gas-tight in the Glaseinschmelzonne 10, 12 of the discharge lamp 1 , Be as rectangular molybdenum foils 16, 18 are welded.
- In the interior 4 protrude two diametrically arranged, such as pin-shaped electrodes 20, 22 made of doped with ThO 2 tungsten, each with one of Molybdenum foils 16, 18 are welded and between which forms a gas discharge during lamp operation.
- an ionizable filling which consists of high purity xenon gas and a plurality of metal halides.
- the electrodes 20, 22 each have a first end portion 26 embedded in the glass melt 10 or 12 as the electrode shaft 24. At a second end portion 28, the electrodes 20, 22 are provided with an electrode tip 30.
- the structure of the electrode tips 30 is at least partially converted by means of high-energy radiation.
- the high-energy radiation is introduced into the electrode tips 30 by means of a laser. Due to the temperature effect of the laser radiation on the electrode tip 30, the fibrous, long-crystalline structural regions combine to form compact, dense units-in other words-a defined recrystallization of the microstructure of the electrode tip 30 takes place.
- the recrystallization causes a relatively coarse-crystalline structure in the region of the electrode tip 30. As a result, this has a structure and purity substantially corresponding to the operating state of the discharge lamp 1.
- This microstructure of the electrode tip 30 remains stable during operation of the lamp 1 and has good ignition properties and an advantageous bow approach.
- the electrode tip 30 according to the invention allows over the prior art according to the EP 0 858 098 B1 Optimal ignition behavior and good arc formation already at the beginning of lamp life. Furthermore, due to the temperature effect of the laser radiation, a high purity of the electrodes 20, 22 is achieved.
- FIG. 2 which shows an enlarged view of the electrode 20 FIG. 1 shows
- the cylindrical electrode shaft 24 tapers frustoconically to the electrode tip 30, the conical surface 32 discharges discharge side in an approximately circular end face 34.
- the electrode tip 30 is produced by means of the laser radiation during the structural transformation and has the in FIG. 1 explained microstructure.
- An electrode 20, 22 produced according to the invention is not limited to the described shaping of the electrode tip 30 by laser radiation, but the electrode tip 30 can be formed by any known from the general state of the art forming technique, in particular by grinding, etching, hammering or the like in any geometric shapes be.
- the discharge-side end 30 of the electrodes 20, 22 may also be thickened instead of pointed.
- the structural transformation of the electrode section 30 according to the invention can take place before or after the welding of the electrode 20, 22 with the molybdenum foil 16, 18.
- the structure of a portion of the electrodes by means of high-energy radiation, preferably laser radiation at least partially converted.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Claims (2)
- Procédé de fabrication d'une électrode (20, 22) en forme de barreau pour une lampe à décharge, caractérisé en ce que l'on transforme, au moins à une extrémité (30) du côté de la décharge de l'électrode (20, 22), une texture fibreuse et à cristaux longs de l'électrode (20, 22) en une texture à cristaux grossiers au moyen d'un rayonnement de grande énergie.
- Procédé selon la revendication 1, dans lequel le rayonnement de grande énergie est un rayonnement laser.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005013760A DE102005013760A1 (de) | 2005-03-22 | 2005-03-22 | Verfahren zur Herstellung einer Elektrode und Entladungslampe mit einer derartigen Elektrode |
PCT/DE2006/000496 WO2006099849A1 (fr) | 2005-03-22 | 2006-03-21 | Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1861862A1 EP1861862A1 (fr) | 2007-12-05 |
EP1861862B1 true EP1861862B1 (fr) | 2009-05-27 |
Family
ID=36648286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06706032A Ceased EP1861862B1 (fr) | 2005-03-22 | 2006-03-21 | Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090015163A1 (fr) |
EP (1) | EP1861862B1 (fr) |
JP (1) | JP4918688B2 (fr) |
CN (1) | CN101147225B (fr) |
DE (3) | DE102005013760A1 (fr) |
WO (1) | WO2006099849A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5322217B2 (ja) * | 2008-12-27 | 2013-10-23 | ウシオ電機株式会社 | 光源装置 |
JP2010205577A (ja) * | 2009-03-04 | 2010-09-16 | Ushio Inc | 光源装置を点灯する方法 |
CN105304431B (zh) * | 2014-05-29 | 2017-06-13 | 深圳凯世光研股份有限公司 | 一种阳极及其处理方法、包括该阳极的短弧放电灯 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3300449A1 (de) * | 1983-01-08 | 1984-07-12 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Verfahren zur herstellung einer elektrode fuer eine hochdruckgasentladungslampe |
JPH05283039A (ja) * | 1992-03-31 | 1993-10-29 | Toshiba Lighting & Technol Corp | 金属蒸気放電灯 |
DE9415217U1 (de) * | 1994-09-21 | 1996-01-25 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München | Hochdruckentladungslampe |
US6705914B2 (en) * | 2000-04-18 | 2004-03-16 | Matsushita Electric Industrial Co., Ltd. | Method of forming spherical electrode surface for high intensity discharge lamp |
JP4846173B2 (ja) * | 2000-04-18 | 2011-12-28 | パナソニック株式会社 | 高圧放電ランプ及び高圧放電ランプ用電極 |
DE10026567A1 (de) * | 2000-05-30 | 2001-12-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Verfahren zur Beschriftung von Quarzglaslampen und damit hergestellte Quarzglaslampen |
JP2004079323A (ja) * | 2002-08-16 | 2004-03-11 | Fuji Photo Film Co Ltd | 放電管の製造方法 |
DE502004008963D1 (de) * | 2003-12-22 | 2009-03-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Elektrodensystem für eine Entladungslampe, Entladungslampe mit einem derartigen Elektrodensystem und Verfahren zur Herstellung eines derartigen Elektrodensystems |
-
2005
- 2005-03-22 DE DE102005013760A patent/DE102005013760A1/de not_active Withdrawn
-
2006
- 2006-03-21 WO PCT/DE2006/000496 patent/WO2006099849A1/fr active Application Filing
- 2006-03-21 EP EP06706032A patent/EP1861862B1/fr not_active Ceased
- 2006-03-21 DE DE502006003811T patent/DE502006003811D1/de not_active Expired - Fee Related
- 2006-03-21 JP JP2008502242A patent/JP4918688B2/ja not_active Expired - Fee Related
- 2006-03-21 US US11/886,962 patent/US20090015163A1/en not_active Abandoned
- 2006-03-21 DE DE112006001333T patent/DE112006001333A5/de not_active Withdrawn
- 2006-03-21 CN CN200680009212XA patent/CN101147225B/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE102005013760A1 (de) | 2006-09-28 |
JP4918688B2 (ja) | 2012-04-18 |
JP2008533689A (ja) | 2008-08-21 |
WO2006099849A1 (fr) | 2006-09-28 |
EP1861862A1 (fr) | 2007-12-05 |
CN101147225B (zh) | 2012-06-27 |
US20090015163A1 (en) | 2009-01-15 |
DE112006001333A5 (de) | 2008-03-06 |
CN101147225A (zh) | 2008-03-19 |
DE502006003811D1 (de) | 2009-07-09 |
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