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 PDF

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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.)
Expired - Fee Related
Application number
EP06706032A
Other languages
German (de)
English (en)
Other versions
EP1861862A1 (fr
Inventor
Jürgen Becker
Jianping Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP1861862A1 publication Critical patent/EP1861862A1/fr
Application granted granted Critical
Publication of EP1861862B1 publication Critical patent/EP1861862B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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)

  1. 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.
  2. Procédé selon la revendication 1, dans lequel le rayonnement de grande énergie est un rayonnement laser.
EP06706032A 2005-03-22 2006-03-21 Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode Expired - Fee Related EP1861862B1 (fr)

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 Expired - Fee Related 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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 Ges Fuer Elektrische Gluehlampen Mbh 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
EP1548788B1 (fr) * 2003-12-22 2009-02-11 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Système d'électrode pour une lampe à décharge, lampe à décharge le comprenant et procédé de sa fabrication

Also Published As

Publication number Publication date
WO2006099849A1 (fr) 2006-09-28
DE502006003811D1 (de) 2009-07-09
DE112006001333A5 (de) 2008-03-06
DE102005013760A1 (de) 2006-09-28
US20090015163A1 (en) 2009-01-15
JP2008533689A (ja) 2008-08-21
EP1861862A1 (fr) 2007-12-05
JP4918688B2 (ja) 2012-04-18
CN101147225A (zh) 2008-03-19
CN101147225B (zh) 2012-06-27

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