EP1548788A2 - Système d'électrode pour une lampe à décharge, lampe a décharge le comprenant et procédé se son fabrication - Google Patents

Système d'électrode pour une lampe à décharge, lampe a décharge le comprenant et procédé se son fabrication Download PDF

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Publication number
EP1548788A2
EP1548788A2 EP04028991A EP04028991A EP1548788A2 EP 1548788 A2 EP1548788 A2 EP 1548788A2 EP 04028991 A EP04028991 A EP 04028991A EP 04028991 A EP04028991 A EP 04028991A EP 1548788 A2 EP1548788 A2 EP 1548788A2
Authority
EP
European Patent Office
Prior art keywords
electrode
metal foil
power supply
supply wire
electrode system
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.)
Granted
Application number
EP04028991A
Other languages
German (de)
English (en)
Other versions
EP1548788B1 (fr
EP1548788A3 (fr
Inventor
Thomas Bittmann
Bodo Mittler
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE10361105A external-priority patent/DE10361105A1/de
Priority claimed from DE200410003041 external-priority patent/DE102004003041A1/de
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1548788A2 publication Critical patent/EP1548788A2/fr
Publication of EP1548788A3 publication Critical patent/EP1548788A3/fr
Application granted granted Critical
Publication of EP1548788B1 publication Critical patent/EP1548788B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/32—Seals for leading-in conductors
    • H01J5/38—Pinched-stem or analogous seals
    • 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
    • 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
    • H01J9/28—Manufacture of leading-in conductors
    • 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
    • H01J9/32—Sealing leading-in conductors
    • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
    • H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/38—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/40—Leading-in conductors

Definitions

  • the invention relates to an electrode system for a discharge lamp according to Preamble of claim 1 and a discharge lamp with such Electrode system and a method for producing such an electrode system.
  • Such an electrode system is for example in the European patent application EP 0 884 763 A2.
  • This document describes an electrode system with a molybdenum foil fuse in quartz glass, wherein a first end of the embedded in quartz glass molybdenum foil with an electrode and a second end this molybdenum foil is connected to a power supply wire. That with the Electrode connected first end of the molybdenum foil is wedge-shaped, the means it has a reduced thickness, the risk of cracking in the glass due to the different thermal expansion coefficients of quartz glass and reduce molybdenum.
  • the electrode system according to the invention has one for generating a gas discharge serving electrode and at least one metal foil, the first end with the electrode is connected and the second end with a Stromzufihrungsdraht, which serves to supply power to the electrode is connected.
  • the at least one metal foil on at least one of its aforementioned Ends, but preferably at both ends, a reduced width.
  • the width of the at least one metal foil in the direction their first or second end steadily reduced.
  • both the electrode and the power supply wire have one flattened portion associated with the first and second ends of the at least one Metal foil is welded.
  • Tensions in the sealing area of the discharge vessel are the flattened ones Ends of the electrode and the power supply wire advantageously rounded educated.
  • the edge of the flattened portion of the electrode or the power supply wire in an advantageous manner with a Bevel provided a reduction in the thickness of the flattened portion of his Edge causes and thus also to reduce mechanical stresses in contributes to the sealing region of the discharge vessel.
  • the minimum width of the at least one narrowed end of at least a metal foil preferably less than or equal to or width of the with this End connected, flattened portion of the electrode or the Power supply wire.
  • the electrode system according to the invention is advantageously used for discharge lamps, used in particular for high pressure discharge lamps.
  • the discharge lamp according to the invention has a discharge vessel, which with a Discharge space and at least one sealed, with an inventive Equipped with electrode system end, with the free end the electrode protrudes into the discharge space, the at least one metal foil embedded in a gastight manner in the at least one sealed end of the discharge vessel is and the free end of the power supply wire from the sealed end led out of the discharge vessel.
  • the non-flattened portion of the electrode is advantageously arranged completely in the discharge space, while the flattened portion of the electrode is preferably partially or completely extends into the sealed end of the discharge vessel. This will be also the mechanical stresses in the sealed end of the discharge vessel decreases during lamp operation and also serves the transition area from the flattened to the non-flattened portion of the electrode as a stop for the adjustment or alignment of the electrode in the discharge vessel.
  • the electrode system according to the invention is preferably used in discharge lamps used, which have a discharge vessel made of quartz glass, that is, the glass contains at least 95 weight percent silica.
  • Such discharge vessels Withstand very high operating temperatures and are therefore commonly used for High-pressure discharge lamps, such as metal halide high pressure discharge lamps used.
  • the electrodes of such a discharge lamp are made preferably of tungsten containing dopants - for example, thorium oxide can, or from a tungsten alloy.
  • Your power supply wires exist preferably of molybdenum, the dopants - for example, potassium and silicon, or yttria or lanthanum oxide - or of a molybdenum alloy.
  • the at least one metal foil of the electrode system according to the invention in this discharge lamp type is preferably made of a molybdenum foil
  • the Dopants - for example, potassium and silicon, or yttria or lanthanum oxide - may contain, or of a molybdenum alloy.
  • the aforementioned molybdenum foil can be unilateral or bilateral with a coating - for example Chrome or ruthenium - be provided to protect it from corrosion. These Coatings may additionally occur on the flattened portion of the electrode or the power supply wire.
  • the process for producing the electrode system according to the invention provides in that before joining the at least one metal foil to the electrode and the Power supply wire at least one end of the at least one metal foil such is tailored so that the at least one metal foil at this end reduces one Has width.
  • the to be connected with this metal foil Section of the electrode and / or the power supply wire is before Bonding with the metal foil flattened, for example by cold forming by means Rolling or hammering.
  • the free Ends of these sections are rounded off by heating to a dome, for example by heating by means of a laser or by TIG welding (tungsten inert gas welding) or by means of a plasma welding process.
  • TIG welding tungsten inert gas welding
  • the edge of the flattened Section of the electrode and / or the Stromzufihrungsstrahtes is due the advantages already mentioned above preferably provided with a chamfer, for example is produced by rolling.
  • the connection between the at least a metal foil and the flattened portion of the electrode and / or the Power supply wire is easily by welding, preferably produced by spot welding. This weld can be easily Produce way by means of a laser.
  • FIG. 1 shows a schematic representation of the preferred embodiment of the electrode system according to the invention, preferably in a metal halide high-pressure discharge lamp used for a vehicle headlight becomes.
  • the electrode system has a molybdenum foil 10 with longitudinal edges 11 and 12, the a tapered first end 101 defined by the sloping side edges 13, 14 is limited, and a tapered second end 102, by the oblique Side edges 15, 16 is limited have.
  • the cross section of this molybdenum foil 10 is lenticular. That is, their thickness, starting from their centerline in the direction of its two side edges 11, 12 towards, steadily decreasing. The thickness in the film center is less than 150 microns, preferably about 25 microns. It depends on the required current carrying capacity of the molybdenum foil 10 from.
  • the width of the molybdenum foil 10, that is, the distance between the longitudinal edges 11 and 12 is 2 mm.
  • the minimum width of the molybdenum foil 10 at its tapered ends 101 and 102 is at least 0.2 mm and is at most as wide as the width of the flattened Ends 21, 31 of the electrode and the power supply wire.
  • the first end 101 of the molybdenum foil 10 is made with a rod-shaped electrode 20 Tungsten connected.
  • This electrode 20 has a flattened end 21, the by two welding points 41, which were produced by means of a laser, with the tapered first end 101 of the molybdenum foil 10 is welded.
  • the electrode 20 has a diameter of about 0.25 mm in the non-flattened area 20.
  • the flattened portion 21 of the electrode 20 has a thickness of about 100 microns and a width of about 0.8 mm.
  • the second end 102 of the molybdenum foil 10 is connected to a Stromzufihrungsdraht 30th made of molybdenum.
  • This power supply wire 30 has a flattened At the end of 31, this was done by two welding spots 42, made by means of a laser were welded to the tapered second end 102 of the molybdenum foil 10.
  • the Stromzufihrungsdraht 30 has a non-flattened area 30 a Diameter of about 0.4 mm.
  • the free end of the flattened portion 21 of the electrode 20 is as in the figures 2 and 3a shown schematically rounded. The same is true for the free end of the flattened portion 31 of the power supply wire 30th
  • the edge of the flattened portion 21 of the electrode 20 is as shown in Figs. 3a and 3b schematically illustrated, provided with a chamfer 22 or bevel, the an angle or inclination of 45 degrees to that with the molybdenum foil 10 welded top of the section 21 has.
  • FIG. 4a shows a molybdenum ribbon from which the molybdenum foil 10 is cut off a correspondingly long piece is won.
  • the sloping Side edges 13, 14 and 15, 16 are thereby punched out of a V-shaped Section of two adjacent molybdenum foils 10 produced. Subsequently The adjacent molybdenum foils 10 are cut apart.
  • the Cut edges of the molybdenum foils 10 can be rolled as in the published patent application EP 0 884 763 A2. In the molybdenum foil 10, the tapered Ends 101 and 102 formed symmetrically.
  • Molybdenum foils 10 ' form the oblique side edges 13', 14 'and 15 ', 16' different angles with the longitudinal edges of the molybdenum foil 10 '. Accordingly their tapered ends are formed asymmetrically.
  • FIG 5 is a metal halide high-pressure discharge lamp for a Motor vehicle headlight shown schematically.
  • This lamp has a discharge vessel 50 made of quartz glass with a discharge space 51 and two diametrically arranged, sealed ends 52, each an electrode system according to the invention with an electrode 20 or 20 ", a molybdenum foil 10 or 10" and a In the discharge space of the discharge vessel, into which the free ends of the electrodes 20, 20 "protrude is one ionizable filling gas-tight enclosed, the xenon and metal halides, for example Sodium iodide, scandium iodide and possibly other iodides, as well as mercury contains. However, the mercury can also be dispensed with.
  • the discharge vessel 50 is surrounded by an outer bulb 70 made of quartz glass, the ultraviolet radiation-absorbing dopants is provided.
  • the lamp has a plastic base 80, which carries the two lamp vessels 50, 80 and the equipped with the electrical connections of the lamp.
  • the remote power supply wire 30 is provided over the provided with a ceramic insulation 61 current return 60 connected to one of the electrical connections (not shown), while the sockelnahe power supply wire 30 "with the other electrical Connection (not shown) is connected.
  • the non-flattened portion of the electrode 20 and 20 "completely arranged in the discharge space 51 of the discharge vessel 50, while the flattened portion 21 of the electrode 20 or 20 "in each case a sealed End 52 of the discharge vessel 50 extends.
  • the molybdenum foils are 10 and 10 ", respectively embedded in a gastight manner in the respective end 52 of the discharge vessel 50.
  • the inner diameter of the substantially circular cylindrical discharge space 51 2.7 mm.
  • the outer contour of the discharge vessel 50 has in the region of Discharge space 51 the shape of a rotationally symmetric ellipsoid.
  • the invention is not limited to the above-described preferred embodiment the invention.
  • the ends of the molybdenum foils 10 or 10 "instead of wedge-shaped narrowed formed in another way tapered be.
  • the aforementioned ends of the molybdenum foils could be narrowed by their edges are arched or formed with curves be provided, as shown for example in the one shown in Figure 6 second embodiment of the invention is shown.
  • the with the electrode or the Stromzufihrungsdraht to be joined ends of the molybdenum foil 10 "' are each bounded by a curved edge 101 "', 102'".
  • the vaulting of this Edges 101 "', 102"' may correspond, for example, to a conic segment or, as shown in Figure 6, the shape of the letter U with diverging U-legs have.
  • the flattening of the molybdenum foils 10 or 10 "welded ends 21st or 31 of the electrode 20 and the power supply wire 30 is not necessarily required. It is possible the degree of flattening of the molybdenum foils 10 or 10 "welded ends 21 and 31 of the electrode 20 and the power supply wire 30 to vary. For example, the flattened ends 21 and 31 have a thickness of only 80 .mu.m instead of the above 100 .mu.m. It is but also possible on the flattening of the molybdenum foils 10 or 10 "welded Ends 21 and 31 of the electrode 20 and the power supply wire 30th to renounce.
  • the laser beam is on with the molybdenum foil 10 and 10 "overlapping end 21 and 31 of the electrode 20 and the power supply wire 30 and not on the molybdenum foil 10 or 10 "to a
  • To perforate the molybdenum foil 10 or 10 "to prevent the overlap area between the molybdenum foil 10 or 10 "and the aforementioned end 21 or 31 of the electrode 20 and the power supply wire 30 is in the preferred Embodiments in the longitudinal direction of the molybdenum foil 1 mm to 2 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
EP04028991A 2003-12-22 2004-12-07 Système d'électrode pour une lampe à décharge, lampe à décharge le comprenant et procédé de sa fabrication Expired - Lifetime EP1548788B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10361105A DE10361105A1 (de) 2003-12-22 2003-12-22 Elektrodensystem für eine Entladungslampe, Entladungslampe mit einem derartigen Elektrodensystem und Verfahren zur Herstellung eines derartigen Elektrodensystems
DE10361105 2003-12-22
DE4003041 2004-01-20
DE200410003041 DE102004003041A1 (de) 2004-01-20 2004-01-20 Elektrodensystem für eine Entladungslampe, Entladungslampe mit einem derartigen Elektrodensystem und Verfahren zur Herstellung eines derartigen Elektrodensystems

Publications (3)

Publication Number Publication Date
EP1548788A2 true EP1548788A2 (fr) 2005-06-29
EP1548788A3 EP1548788A3 (fr) 2007-01-17
EP1548788B1 EP1548788B1 (fr) 2009-02-11

Family

ID=34553339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04028991A Expired - Lifetime EP1548788B1 (fr) 2003-12-22 2004-12-07 Système d'électrode pour une lampe à décharge, lampe à décharge le comprenant et procédé de sa fabrication

Country Status (4)

Country Link
EP (1) EP1548788B1 (fr)
JP (1) JP2005183398A (fr)
AT (1) ATE422706T1 (fr)
DE (1) DE502004008963D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006099849A1 (fr) * 2005-03-22 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode
WO2009106133A1 (fr) * 2008-02-27 2009-09-03 Osram Gesellschaft mit beschränkter Haftung Feuille scellée, son procédé de fabrication et lampe munie d'une telle feuille

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017216146A (ja) * 2016-05-31 2017-12-07 東芝ライテック株式会社 ロングアーク型紫外線ランプ及び照射装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868528A (en) 1974-01-14 1975-02-25 Gen Electric Quartz pinches containing sealant glass
GB2002954A (en) 1977-08-15 1979-02-28 Gen Electric Electrode in lead for miniature discharge lamps
GB2048563A (en) 1979-04-23 1980-12-10 Gen Electric Discharge lamps
EP0884763A2 (fr) 1997-06-11 1998-12-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Scellement d'une feuille de molybdène dans le verre et lampe électrique comportant une feuille de molybdène ainsi scellée

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868528A (en) 1974-01-14 1975-02-25 Gen Electric Quartz pinches containing sealant glass
GB2002954A (en) 1977-08-15 1979-02-28 Gen Electric Electrode in lead for miniature discharge lamps
GB2048563A (en) 1979-04-23 1980-12-10 Gen Electric Discharge lamps
EP0884763A2 (fr) 1997-06-11 1998-12-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Scellement d'une feuille de molybdène dans le verre et lampe électrique comportant une feuille de molybdène ainsi scellée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006099849A1 (fr) * 2005-03-22 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Procede de fabrication d'une electrode et lampe a decharge comportant une telle electrode
WO2009106133A1 (fr) * 2008-02-27 2009-09-03 Osram Gesellschaft mit beschränkter Haftung Feuille scellée, son procédé de fabrication et lampe munie d'une telle feuille

Also Published As

Publication number Publication date
DE502004008963D1 (de) 2009-03-26
JP2005183398A (ja) 2005-07-07
EP1548788B1 (fr) 2009-02-11
ATE422706T1 (de) 2009-02-15
EP1548788A3 (fr) 2007-01-17

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