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EP0479087B1 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression Download PDF

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Publication number
EP0479087B1
EP0479087B1 EP91116145A EP91116145A EP0479087B1 EP 0479087 B1 EP0479087 B1 EP 0479087B1 EP 91116145 A EP91116145 A EP 91116145A EP 91116145 A EP91116145 A EP 91116145A EP 0479087 B1 EP0479087 B1 EP 0479087B1
Authority
EP
European Patent Office
Prior art keywords
electrode
molybdenum
foils
discharge lamp
bulb
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 - Lifetime
Application number
EP91116145A
Other languages
German (de)
English (en)
Other versions
EP0479087A1 (fr
Inventor
Angus Dixon
Hans-Werner Gölling
Jürgen Begemann
Jörn Dierks
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
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0479087A1 publication Critical patent/EP0479087A1/fr
Application granted granted Critical
Publication of EP0479087B1 publication Critical patent/EP0479087B1/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
    • 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
    • H01J61/368—Pinched seals or analogous seals

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of claim 1 or the preamble of claim 2.
  • Such high-pressure discharge lamps are, in particular, metal halide discharge lamps and high-pressure xenon and high-pressure mercury discharge lamps. These lamps can e.g. B. used in film and television recordings and for stage lighting.
  • the metal halide discharge lamps e.g. B. have relatively long piston necks which are fused to the actual discharge space. The relatively long piston necks make it possible to place the sealing foils for the electrode shafts as far as possible from the discharge arc in order to avoid sealing problems on the sealing foils caused by the heat of the discharge arc.
  • the quartz glass of the piston neck must not touch the electrode shaft, because otherwise the greatly differing thermal expansion coefficients of quartz glass and tungsten electrode shaft will cause considerable mechanical stresses during cooling, which could lead to cracks or cracks in the quartz glass and thus to premature failure of the Can lead lamp.
  • GB-A 682 376 discloses a high-pressure discharge lamp, the electrode shafts of which are not welded directly to the molybdenum sealing foils melted into the glass bulb neck, but rather are each connected to the molybdenum sealing foils in a mechanically and electrically conductive manner via a cylindrical sleeve.
  • One end of this cylindrical sleeve protrudes into the interior of the lamp and carries the electrode shaft, while its other end is welded to the molybdenum sealing film melted into the bulb neck. In this way, a sufficient distance between the electrode shaft and the lamp bulb is achieved, so that sticking of the electrode shaft to quartz glass of the bulb neck cannot occur.
  • the cylindrical sleeve consists of a thin, high-temperature resistant, rolled metal foil, the thermal expansion coefficient of which is similar to that of quartz glass, so that no significant mechanical stresses occur when the lamp vessel is heated.
  • this electrode system is unsuitable, in particular for high-pressure discharge lamps with a high power consumption (in the KW range).
  • DE-A 1 489 616 describes a high-pressure discharge lamp with two opposite bulb necks, in each of which an electrode system is integrated.
  • Each electrode system has an electrode shaft, two molybdenum disks and several molybdenum sealing foils sealed in a gas-tight manner in the piston neck.
  • the electrode shaft is mechanically and electrically conductively connected to a first molybdenum disk via a threaded bolt, while the second molybdenum disk is connected to the power supply lines via a connecting piece.
  • the strip-like slit ends of the band-like molybdenum sealing foils are welded in an electrically conductive manner to the two molybdenum disks, so that there is an electrically conductive connection between the electrode and the associated power supply.
  • the threaded bolts minimize mechanical stresses that occur during lamp operation due to the different thermal expansion coefficients of quartz glass and electrode shaft.
  • Lamp the danger that softened quartz glass accumulates on the electrode shafts when the electrode systems melt and cracks occur in the bulb neck due to the mechanical stresses caused by the different thermal expansion coefficients of quartz glass and the electrode shaft.
  • the quartz glass of the bulb necks in the lamps according to the invention can only touch the high-temperature-resistant metal foils which surround the electrode shafts and the power supply parts.
  • the thin metal foils act as a buffer between the respective electrode shaft or the power supply parts and the quartz glass of the corresponding piston neck. Investigations have shown that the profiling of the surfaces of these metal foils means that no or only slight mechanical stresses are transferred to the quartz glass wall during the heating of the discharge vessel. Due to the profiling, the metal foils receive spring properties and form an elastic intermediate layer between the electrode shafts or the power supply parts and the quartz glass wall, so that the mechanical stresses due to the extremely different thermal expansion coefficients of quartz and tungsten or molybdenum can be absorbed by the profile foils. In addition, the profile foils allow a more precise maintenance of the electrode spacing and a better axial alignment of the electrode system in the piston neck.
  • the quartz glass melting capillaries which are still loose before melting, are fixed by the profile foils, i.e. they do not need additional measures, e.g. Holding flags to be clamped.
  • thin molybdenum foils are preferably used, which are wound once or twice around the electrode shafts and the current leads.
  • FIG. 1 shows a longitudinal section through the part of a high-pressure discharge lamp relating to the invention, in particular a 24,000 watt metal halide discharge lamp.
  • the discharge vessel 1 consists of quartz glass and has a discharge space 2 with a volume of approximately 250 cm 3. On the opposite sides of the discharge space 2, two cylindrical piston necks 3 with an outer diameter of 22 mm are arranged, of which only one is shown in the figure.
  • Two electrode shafts 4 made of tungsten each extend from the discharge space 2 into a bulb neck 3 and are each approximately 5 mm thick there Molybdenum disk 7 soldered. The diameter of the electrode shafts 4 is approximately 6 mm.
  • Four sealing foils 5 made of molybdenum are welded to the molybdenum disk 7 and are arranged uniformly on the outer surface of a hollow quartz glass rod 8. The sealing foils 5 form a gas-tight seal with the quartz glass of the piston neck 3 and the hollow rod 8.
  • Both electrode shafts 4 are each wrapped in the piston neck area by a thin molybdenum foil 6, which is wound 1.5 times around the circumference of the electrode shafts 4 and extends at least from the end of the electrode shaft 4 located in the piston neck 3 to the opening of the piston neck 3.
  • the thickness of the molybdenum foils 6 and the diameter of the electrode shaft 4 are not shown to scale in the figure, which is used only for the schematic representation of the lamp structure.
  • both surfaces of the molybdenum foils 6 each have a regular profile, which cannot be seen from FIGS. 1 to 5.
  • the profiles in the surfaces of the foils 6 are created by rolling the molybdenum foils 6. In the non-rolled state, the thickness of these foils is approximately 22 »m.
  • the profile in the surface of the molybdenum foils 6 facing the quartz glass is shown schematically in FIG. 6 and explained in more detail below in the text in the next exemplary embodiment.
  • FIG. 2 shows a longitudinal section through a metal halide discharge lamp according to the invention according to a second exemplary embodiment. It has an electrical power consumption of approx. 12 kW.
  • the discharge vessel 9 consists of quartz glass and has a discharge space 10 and two axially symmetrically arranged Piston necks 11 on.
  • Two tungsten electrode shafts 12 each extend from the discharge space 10 into a piston neck 11 and are welded there with their flattened end 13 to two parallel sealing foils 14 made of molybdenum, which make electrical contact with the current leads 15 and with the quartz glass of the piston necks 11 form a gas-tight seal.
  • Both electrode shafts 12 are surrounded in the region of the piston necks 11 by a sleeve 16, which each consist of a rolled, profiled molybdenum foil, which surround the outer surface of the electrode shafts 12 at least once, preferably 1.25 times.
  • the sleeves 16 are welded to the corresponding electrode shaft 12 at two points each and extend from its flattened end 13 into the discharge space 10.
  • the side faces of the flattened ends 13 of both electrode shafts 12, which are not welded to the sealing foils 14, are additionally encased by a U-shaped, profiled molybdenum foil 17, which ends with the sleeve 16 of the corresponding electrode shaft 12.
  • the current leads 15, insofar as they run within the piston necks 11, are each surrounded by a thin profiled molybdenum foil 18.
  • the molybdenum foils have a thickness of approximately 20 »m before the profile is embossed. After the profile has been embossed, depending on the embodiment, its thickness increases by a factor of 1.2 to 5.
  • the profile of the molybdenum foils for the sleeves 16 and for the coverings 17, 18 consists of a first set of parallel grooves, the second set cuts of parallel grooves at an angle of approx. 60 °.
  • the distance between two adjacent grooves from a coulter is approximately 1 mm ( Figure 6).
  • the metal foils 6, 16, 17, 18 can also consist of tantalum or tungsten or of alloys of the three metals molybdenum, tungsten and tantalum and their thickness can be up to 200 »m.
  • the covering of the electrodes and the power supply lines with profiled molybdenum foils has not only proven itself in the case of the metal halide discharge lamps of the above exemplary embodiments, but can also be used successfully with other high-pressure discharge lamps, in particular mercury vapor lamps and with high-pressure xenon discharge lamps (short-arc lamps).
  • FIG. 4 shows, as a third exemplary embodiment, a cross section through an electrode melting of a high-pressure mercury vapor or xenon high-pressure discharge lamp, which is designed for currents greater than 20 A. Only part of the discharge vessel 19 and one of the two bulb necks 20, which, like the discharge vessel 19, are made of quartz glass, are shown in FIG. 4 of the high-pressure discharge lamp according to the invention.
  • the electrode systems have an electrode head 21 made of tungsten, which is welded or soldered to an electrode shaft 22 made of tungsten is.
  • a 5 mm thick molybdenum disk 23 is soldered to the free end of the electrode shaft 22.
  • the electrode system also includes four molybdenum sealing foils 24, which are arranged uniformly along the circumference of the molybdenum disk 23 and are welded to the latter at one of their ends.
  • the other end of the molybdenum sealing foils 24 is welded to a second, 5 mm thick molybdenum disk 25, which in turn is welded or soldered to a power supply 26 made of molybdenum.
  • the empty space between the two molybdenum disks 23, 25 is filled by two melting capillaries 27, 28 made of quartz glass, which coaxially envelop the blind piece 26a of the power supply 26 which projects beyond the molybdenum disk 25 in the direction of the discharge space.
  • the blind piece 26a is used for heat dissipation and for alignment and for fixing the power supply 26.
  • the outer melting capillary 28 is closed at its end, which faces the discharge space.
  • the four sealing foils 24 rest on the outer circumferential surface of the melting capillary 28.
  • the space between the inner melting capillary 27, which only serves as a melting aid, and the blind piece 26a of the power supply 26 is filled by a thin, profiled molybdenum foil 29 which completely surrounds the outer surface of the power supply 26 in this area.
  • the end of the power supply 26 and the electrode shaft 22 facing away from the discharge space are each encased in the region of the piston neck 20 by a melting ring 30, 31 of a quartz glass capillary, which fuse with the quartz glass of the piston neck 20 during the melting process.
  • Direct contact of the electrode shaft 22 and the power supply 26 with the melting rings 30, 31 is achieved by two prevents thin, profiled molybdenum foils 32, 33 which fill the space between the sealing rings 30, 31 and the electrode shaft 22 or the power supply 26 and completely surround their outer surface in this area.
  • the outer surfaces of the two molybdenum disks 23, 25 are each surrounded by a sleeve 34, 35 made of profiled molybdenum foil.
  • the cover surfaces of the molybdenum disks 23, 25, which face the melting rings 30, 31, are each covered by a thin profiled molybdenum foil 36, 37.
  • the profiled molybdenum foils used have the same profile as the foils of the second exemplary embodiment.
  • the thickness of the molybdenum foils used here also corresponds to these.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (7)

  1. Lampe à décharge haute pression comportant
    - une enceinte de décharge (9) à symétrie de révolution, en verre quartzeux, qui comprend un espace de décharge (10) ainsi que deux cols cylindriques (11) d'ampoule, disposés sur des côtés opposés de l'espace de décharge (10),
    - un gaz ou un mélange gazeux ionisable contenant éventuellement d'autres constituants de remplissage, comme par exemple du mercure et des halogénures métalliques, dans l'espace de décharge (10),
    - un système d'électrode pour chaque col (11) de l'ampoule, constitué respectivement par une électrode, une tige d'électrode (12) enchâssée dans le col (11) de l'ampoule, une ou plusieurs feuilles d'étanchéité (14) scellées par fusion, d'une manière étanche aux gaz, dans le col (11) de l'ampoule, ainsi que des entrées de courant (15), les feuilles d'étanchéité (14) étant soudées à la tige d'électrode (12), de sorte qu'elles établissent une liaison électriquement conductrice entre la tige d'électrode (12) et l'entrée de courant (15),
    caractérisée par le fait que les tiges d'électrodes (12) et les entrées de courant (15) sont enveloppées, au moins dans la zone des cols (11) de l'ampoule, d'une ou plusieurs feuilles métalliques (16,17,18) résistantes aux températures élevées et pourvues d'un profil de surface.
  2. Lampe à décharge haute pression comportant
    - une enceinte de décharge à symétrie de révolution (1,19) réalisée en verre quartzeux, qui possède un espace de décharge (2) ainsi que deux cols cylindriques (3, 20) d'ampoule, disposés sur des côtés opposés de l'espace de décharge (2),
    - un gaz ou un mélange gazeux ionisable comportant éventuellement d'autres constituants de remplissage, comme par exemple du mercure et des halogénures métalliques, dans l'espace de décharge (2),
    - un système d'électrode pour chaque col (3,20) de l'ampoule, constitué respectivement par une électrode, une tige d'électrode (4,22) enchâssée dans le col (3,20) de l'ampoule, une entrée de courant (26), deux disques de molybdène (7,23,25) disposés dans le col (3,20) de l'ampoule et dont l'un (7,23) est fixé par brasage à la tige d'électrode (4,22) et dont l'autre (25) est fixé par brasage à l'entrée de courant (26), et une ou plusieurs feuilles d'étanchéité (5,24), qui sont scellées par fusion, d'une manière étanche aux gaz, dans le col (3,20) de l'ampoule et sont soudées respectivement aux surfaces latérales des disques de molybdène (7,23,25), de sorte qu'elles établissent une liaison électriquement conductrice entre les deux disques de molybdène (7,23,25),
    caractérisée par le fait que les surfaces latérales des disques de molybdène (7,23,25) et les tiges d'électrode (4,22) ainsi que les entrées de courant (26) sont enveloppés, au moins dans la zone des cols (3,20) de l'ampoule, d'une ou plusieurs feuilles métalliques (6,32,33,34,35) résistantes aux températures élevées et comportant un profil de surface.
  3. Lampe à décharge haute pression suivant l'une des revendications 1 ou 2, caractérisée par le fait que les feuilles métalliques (6,16,18,32,33,34,35), qui résistent aux températures élevées et sont pourvues d'un profil de surface, entourent sous la forme d'une ou de deux couches les surfaces latérales des tiges d'électrodes (4,12,22), des entrées de courant (15,26) et des disques de molybdène (7,23,25).
  4. Lampe à décharge haute pression suivant la revendication 1, caractérisée par le fait que les tiges d'électrodes (12) possèdent chacune une extrémité aplatie (13), qui est soudée respectivement à au moins une feuille d'étanchéité (14), les zones superficielles des extrémités aplaties (13) , qui ne sont pas recouvertes par une feuille d'étanchéité (14), étant complètement enveloppées par au moins une autre feuille métallique profilée (17), qui résiste aux hautes températures.
  5. Lampe à décharge haute pression suivant les revendications 1, 2 ou 4, caractérisée par le fait que l'épaisseur des feuilles métalliques (6,16,17,18,32,33,34, 35), qui résistent aux températures élevées et possèdent un profil de surface, est comprise entre 20 mm et 200 mm.
  6. Lampe à décharge haute pression suivant les revendications 1, 2 ou 4, caractérisée par le fait que les feuilles métalliques (6,16,17,18,32,33,34,35), qui résistent aux hautes températures et possèdent un profil de surface, sont constituées par l'un des métaux : molybdène, tantale ou tungstène ou par un alliage de ces métaux.
  7. Lampe à décharge haute pression suivant la revendication 2, caractérisée par le fait que l'épaisseur des disques de molybdène (7,23,25) est comprise entre 2 mm et 20 mm.
EP91116145A 1990-10-02 1991-09-23 Lampe à décharge à haute pression Expired - Lifetime EP0479087B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9013735U DE9013735U1 (de) 1990-10-02 1990-10-02 Hochdruckentladungslampe
DE9013735U 1990-10-02

Publications (2)

Publication Number Publication Date
EP0479087A1 EP0479087A1 (fr) 1992-04-08
EP0479087B1 true EP0479087B1 (fr) 1995-12-20

Family

ID=6858004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91116145A Expired - Lifetime EP0479087B1 (fr) 1990-10-02 1991-09-23 Lampe à décharge à haute pression

Country Status (4)

Country Link
US (1) US5200669A (fr)
EP (1) EP0479087B1 (fr)
JP (1) JPH0499663U (fr)
DE (2) DE9013735U1 (fr)

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JP3480364B2 (ja) * 1999-04-23 2003-12-15 ウシオ電機株式会社 ショートアーク型放電ランプ
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JP3586607B2 (ja) * 1999-12-28 2004-11-10 Ｎｅｃマイクロ波管株式会社 高圧放電灯
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JP3591439B2 (ja) * 2000-09-21 2004-11-17 ウシオ電機株式会社 ショートアーク放電ランプ
JP3652602B2 (ja) * 2000-12-05 2005-05-25 株式会社小糸製作所 アークチューブおよびその製造方法
JP3518533B2 (ja) * 2001-10-19 2004-04-12 ウシオ電機株式会社 ショートアーク型超高圧放電ランプ
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JP2004265753A (ja) * 2003-03-03 2004-09-24 Ushio Inc ショートアーク型超高圧放電ランプ
DE102004011555B3 (de) * 2004-03-08 2005-10-27 Schott Ag Gasentladungslampe
JP4544204B2 (ja) * 2005-08-08 2010-09-15 ウシオ電機株式会社 外部電極型放電ランプ、およびそのランプ装置
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DE102005046483A1 (de) * 2005-09-28 2007-03-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Entladungslampe
US20070205724A1 (en) * 2006-03-03 2007-09-06 Schaefer Raymond B Advanced surface discharge lamp systems
US7593289B2 (en) * 2006-04-17 2009-09-22 Phoenix Science & Technology, Inc. Reflectors and reflector light and sound source systems
JP4724193B2 (ja) 2007-07-17 2011-07-13 パナソニック株式会社 高圧放電ランプ、それを用いたランプユニット、およびそのランプユニットを用いた投射型画像表示装置
JP4682216B2 (ja) * 2007-11-26 2011-05-11 パナソニック株式会社 高圧放電ランプ、それを用いたランプユニットおよびそのランプユニットを用いた投射型画像表示装置
WO2009146751A1 (fr) * 2008-06-06 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Passage de conducteur avec profil de feuille curviligne
DE102008037319A1 (de) * 2008-08-11 2010-02-18 Osram Gesellschaft mit beschränkter Haftung Folie für Lampen und elektrische Lampe mit einer derartigen Folie sowie zugehöriges Herstellverfahren
DE102009048432A1 (de) * 2009-10-06 2011-04-07 Osram Gesellschaft mit beschränkter Haftung Gasentladungslampe
JP5365799B2 (ja) * 2009-10-23 2013-12-11 ウシオ電機株式会社 高圧放電ランプおよび高圧放電ランプの製造方法
GB0922076D0 (en) * 2009-12-17 2010-02-03 Ceravision Ltd Lamp
JP5840432B2 (ja) * 2011-09-21 2016-01-06 株式会社オーク製作所 放電ランプ
JP6727650B2 (ja) * 2016-09-01 2020-07-22 フェニックス電機株式会社 放電ランプの封止構造、およびそれを備える放電ランプ
DE102018207236A1 (de) * 2018-05-09 2019-11-14 Osram Gmbh Lagerungselement mit flächig ausgebildeter schicht

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Also Published As

Publication number Publication date
JPH0499663U (fr) 1992-08-28
EP0479087A1 (fr) 1992-04-08
DE59107116D1 (de) 1996-02-01
US5200669A (en) 1993-04-06
DE9013735U1 (de) 1992-02-06

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