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WO2009115116A1 - Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse - Google Patents

Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse Download PDF

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Publication number
WO2009115116A1
WO2009115116A1 PCT/EP2008/053252 EP2008053252W WO2009115116A1 WO 2009115116 A1 WO2009115116 A1 WO 2009115116A1 EP 2008053252 W EP2008053252 W EP 2008053252W WO 2009115116 A1 WO2009115116 A1 WO 2009115116A1
Authority
WO
WIPO (PCT)
Prior art keywords
discharge lamp
gas
gas discharge
ppm
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
Application number
PCT/EP2008/053252
Other languages
German (de)
English (en)
Inventor
Ulrich Hartwig
Henning Rehn
Matthias Morkel
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
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 Osram GmbH filed Critical Osram GmbH
Priority to PCT/EP2008/053252 priority Critical patent/WO2009115116A1/fr
Priority to TW098106922A priority patent/TW200943371A/zh
Publication of WO2009115116A1 publication Critical patent/WO2009115116A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent

Definitions

  • the invention relates to a gas discharge lamp of the type specified in the O- term of claim 1 and a method for producing a gas discharge lamp specified in the preamble of claim 10. Art.
  • the gas discharge lamp comprises a lamp bulb, which is filled with a noble gas, eg xenon, or noble gas mixture which is under a cold filling pressure and within which two electrodes are arranged, between which an arc discharge can be generated.
  • a noble gas eg xenon, or noble gas mixture which is under a cold filling pressure and within which two electrodes are arranged, between which an arc discharge can be generated.
  • the operating pressures are übli ⁇ chhold between 10 bar and 150 bar.
  • the electrodes are made of doped or undoped tungsten, since this has a particularly high evaporation temperature and chemical resistance.
  • a disadvantage of the known gas discharge lamps is the fact that, due to the thermal stress caused by the arc discharge generated during operation between the two electrodes, tungsten evaporates and deposits on the inner wall of the lamp envelope. This results due to the undesirable blackening of the lamp bulb in a loss of light ⁇ power and a corresponding shortening of the life duration of the gas discharge lamp.
  • ⁇ zutern various constructive measures be ⁇ known. For example, the electrode tip temperature can be lowered and the evaporation of the tungsten can be correspondingly reduced by workings reducing the dopants.
  • these also impact on the bulb, so that bulky lamp bulbs must be selected in order to provide a higher surface for the precipitation and to ensure an acceptable life of the gas discharge lamp can.
  • the gas discharge lamp must be disposed of in a comparatively complicated manner.
  • the thermal stress of an electrode connected as anode can alternatively be improved by the choice of a larger diameter or by the provision of cooling.
  • the geometry and the material ⁇ lien used respectively for the electrodes can be adapted to one another that a ge ⁇ shallowest electrode temperature is achieved, in which the gas discharge lamp is still stable.
  • Object of the present invention is therefore to provide a gas discharge lamp of the type mentioned to sheep ⁇ fen, which is structurally simple and has an increased life.
  • a gas discharge lamp which has a simple construction and an increased service life, is inventively created by adding a halogen compound to the inert gas or noble gas mixture, ie the actual filling gas.
  • the halogen compound may in principle comprise an elementary halogen, a covalened halide or a salt-like or complexed halide. This allows during operation of the gas discharge lamp an advantageous embodiment of a chemical transport process, wherein the evaporation of the Elekt ⁇ tears tungsten in the colder region of the lamp with the piston at the prevailing Radiostempe ⁇ temperatures usually gaseous halogen compound to a gaseous tungsten halide compound or In the presence of oxygen, it reacts to form a tungsten oxohalide.
  • an operating mode of the gas discharge lamp can be selected, in which a height ⁇ re electrode temperature up to the point of liquefaction of tungsten and a correspondingly improved emission ⁇ characteristic of the gas discharge lamp are given.
  • basic ⁇ additionally also on the addition of metals - for example, mercury - or metal salts (especially halogenated compounds with alkali and alkaline earth and rare He ⁇ ) having a spectral line in the visible to the human spectral range and thus a change in the radiation characteristic cause, renounce.
  • metals for example, mercury - or metal salts (especially halogenated compounds with alkali and alkaline earth and rare He ⁇ ) having a spectral line in the visible to the human spectral range and thus a change in the radiation characteristic cause, renounce.
  • metals for example, mercury - or metal salts (especially halogenated compounds with alkali and alkaline earth and rare He ⁇ ) having a spectral line in the visible to the human spectral range and thus a change in the radiation characteristic cause, renounce.
  • a halogen compound dissolves so-with by departure from conventional technologies in a simple and inexpensive manner an unsolved need which te in the present mass products in
  • the cold ⁇ filling pressure of the filling gas within the lamp bulb we ⁇ least 20 bar and preferably at least 40 bar be ⁇ carries.
  • a cold fill pressure correspondingly high operating pressures are achieved which additionally reduces the Ab ⁇ vapor rate of the tungsten from the electrodes.
  • current density and luminance of the Gasentla pressure discharge lamp over a filled with a low cold fill pressure gas discharge lamp can be significantly increased.
  • the gas discharge lamp can thus be oriented ⁇ forms as high pressure and the high pressure gas discharge lamp easily.
  • the electrodes are geometrically designed such that the gas discharge lamp can be operated with alternating current and / or with direct current.
  • betreib ⁇ bare gas discharge lamp that both electrodes are substantially pointed to-can to be, for example vorgese ⁇ hen, are formed continuously.
  • a particularly ge ⁇ One suitable method for operating the gas discharge lamp with an AC feed signal is given, for example, filed on the same day application of the same applicant with the internal file reference 200725534th Conversely, it can be provided for an operable with direct current ⁇ gas- discharge lamp that as the cathode electrode to be switched tapered and as the anode to be switched electrode with a large front area is trained.
  • the gas discharge lamp can thus be opti ⁇ times designed depending on the particular intended use.
  • the halogen compound comprises bromine and / or a bromide, in particular a bromine compound which is liquid and / or gaseous at room temperature, preferably HBr and / or CH 2 Br 2 .
  • a bromine compound which is liquid and / or gaseous at room temperature, preferably HBr and / or CH 2 Br 2 .
  • the use of bromine offers the advantage that tungsten-bromine compounds are stable up to about 1500 K and thus reliably decompose at the tips of the electrodes, as these have the required decomposition temperature and represent the hottest points of the gas discharge lamp.
  • tungsten-iodine compounds already decompose at considerably lower temperatures of about 500 K and on the other hand tungsten-fluorine or tungsten-chlorine compounds at higher temperatures, so that under the usual operating conditions no reliable decomposition is guaranteed.
  • the addition of metal halides or metal bromides is dispensed with, since the addition of metal ions can adversely affect the achievable spectrum and the color temperature or the Farbwiedegabein- dex the gas discharge lamp.
  • the concentration of the halogen compound is between 5 ppm and 4000 ppm, in particular between 10 ppm and 2000 ppm and preferably between 20 ppm and 800 ppm.
  • ppm refers to mass fractions per million.
  • Below 5 ppm the chemical transport process can no longer be maintained sufficiently so that the deposition rate of tungsten on the lamp envelope is not sufficiently reduced.
  • Above a concentration of 4000 ppm occur undesirable reactions between the halogen compound and the electrode material, whereby the life of the gas discharge lamp is also undesirable affected.
  • the electrode tips can increasingly grow together, which ultimately leads to rapid uselessness of the gas discharge lamp.
  • a halogen concentration within the range between 5 ppm and 4000 ppm on the other hand, a stable circular reaction is ensured without impairing the electrodes.
  • At least one electrode it has proven to be advantageous for at least one electrode to be doping-free, in particular without thorium and / or bariumum and / or lanthanum doping, and without a corresponding insert in the electrode tip.
  • This allows particularly in a thorium-free elec- rode a simpler, cheaper and industrial safet ⁇ eral assembly of the gas discharge lamp, since no diesbezüg ⁇ union radiation protection requirements more must be considered.
  • this results in a correspondingly problem-free disposal or simplified recycling of the gas discharge lamp.
  • a further advantage is that can condense on the lamp bulb during operation of the Gasentla pressure discharge lamp no undesired precipitation of Dotie ⁇ means approximately or other additives.
  • At least one electrode is made of highly There is tungsten.
  • High-purity tungsten here means in particular ⁇ sondere tungsten having a concentration of impurities less than 10 ppm, and Fe, Ni, Na, Li preferably below 5 ppm.
  • the use of high-purity tungsten allows advantageous utilization of its high melting point of about 3422 0 C or its boiling point of about 5555 0 C, so that the gas discharge lamp is operable at higher temperatures and has a correspondingly improved Ab ⁇ beam characteristic.
  • ge ⁇ give that these W is a lamp power between 5 and 500 W, in particular between 10 W and 350 W, has.
  • a particularly reliable ignition of the Gasentladungslam- pe with a corresponding reduction in the required ignition voltage is ensured in a further advantageous embodiment characterized in that it comprises a starting aid, in particular a ⁇ sondere Zündblase and / or a UV LED.
  • the gas discharge lamp is designed as a front ⁇ preferably double-ended short arc lamp and / or as a reflector lamp.
  • a Ausgestal ⁇ tion as a short arc lamp, the gas discharge lamp can be used before ⁇ geous as a point light source with low space requirement.
  • the distance between the first and the second electrode system is at most 3.0 mm and preferably at most 2.5 mm. Due to the darkness prevented by means of the halogen cycle, the lamp bulb can be made very compact become. The small volume also allows a higher operating pressure, which in turn reduces the evaporation rate of the electrode material and ensures an additional extension of the life.
  • an embodiment as a reflector lamp has the advantage that the light generated by the gas discharge lamp can be bundled in a desired manner and selectively radiated.
  • a sunlight similar Abstrahl characteris- tik is the gas discharge lamp having a color rendering index of about 92 achieved in a further embodiment that the fill gas of xenon be ⁇ is at least substantially. Essentially, this is understood to mean a volume fraction of between about 90% and 100%.
  • the heat conduction within the lamp envelope is advantageously reduced by the filling gas, which consists at least substantially or completely of xenon. Since the lamp bulb ⁇ due to the inventively reduced tungsten precipitate can be made correspondingly smaller, advantageously a correspondingly small amount of relatively expensive xenon is required, resulting in further savings.
  • a further aspect of the invention relates to a method for producing a gas discharge lamp, in which two tungsten electrodes serving to generate an arc discharge are arranged inside a lamp envelope and the lamp envelope is filled with a filling gas which is under a cold filling pressure and from a noble gas or Noble gas mixture exists. It is inventively provided that the filling gas is added a halogen compound. This allows the gas discharge lamp kon- structurally simple and inexpensive and has a significantly increased life.
  • FIG. 1 is a schematic and fragmentary view of egg ⁇ ner formed as a xenon short arc lamp gas discharge lamp according to the prior art
  • FIG. 2 shows a schematic and partial view of an exemplary embodiment of a gas discharge lamp designed as a xenon short arc lamp with an added halogen
  • Fig. 3 is a schematic and fragmentary view ei ⁇ ner gas discharge lamp according to a second exporting ⁇ approximately example.
  • Fig. 1 shows a schematic and partial view of a ⁇ An designed as a short-arc lamp xenon gas discharge lamp according to the prior art.
  • the gas ⁇ discharge lamp comprises a lamp vessel 10 which is filled with xenon at a cold fill pressure standing as a filling gas, and are arranged inside said two electrodes 12a, 12b for generating an arc discharge.
  • both electrodes 12a, 12b are undoped Tungsten and are geometrically designed such that the gas discharge lamp is operated with direct current.
  • the electrode 12a to be switched as the cathode is pointed and the electric electrode 12b to be switched as the anode is formed substantially circularly cylindrical with a large surface area and a large front area.
  • the gas discharge lamp shown was operated for three hours without the addition of a halogen compound and shows a considerable blackening of the lamp bulb 10 due to the evaporated tungsten from the electrodes 12a, 12b (only schematically indicated by line thickness).
  • Fig. 2 shows a schematic and partial view of a ⁇ An embodiment of a formed as a short-arc lamp xenon arc lamp with added bromine as the halogen compound.
  • the bromine can in principle be added as elemental Br 2 , as bromine salt, bromine ⁇ material or as a bromo hydrocarbon compound and is in the embodiment shown in egg ⁇ ner concentration between 10 ppm and 2000 ppm before.
  • the filling gas consists of xenon and is under a cold filling ⁇ pressure of at least 40 bar. Alternatively or additionally, however, other filling gases such as neon or argon or corresponding gas mixtures may be provided. Likewise, from ⁇ soft cold filling pressures between about 15 bar and 45 bar or more may be provided.
  • the geometry of the electrodes 12a, 12b, which are arranged at a distance of 0.8 mm from each other, is designed such that the gas discharge lamp can be operated with direct current.
  • the gas discharge lamp shown was operated for 160 hours and shows no blackening of the lamp bulb 10 or damage to the electrodes 12a, 12b due to the chemical transport process made possible by the added bromine.
  • Fig. 3 shows a schematic and fragmentary view on ⁇ a gas discharge lamp according to a second off ⁇ operation example.
  • both electrodes 12a, 12b formed pointed zulau ⁇ fend, so that the gas discharge lamp is operated with alternating current.
  • a likewise filled with xenon bubble 16 is arranged as a starting aid in the area of a lamp shaft 14.
  • a foil-shaped current feedthrough 18 extends to the electrode 12a. Due to the sharp-edged design of the current lead-through 18 will become apparent in connection with an external coil 20 (s. Fig. 4) high electric field strengths ⁇ through which a Vorgasentladung is generated.
  • the bladder 16 may also be provided alternative starting aids such as UV LEDs or the like.
  • a winding is wound directly around the lamp envelope as a starting aid.

Landscapes

  • Discharge Lamp (AREA)

Abstract

L'invention concerne une lampe à décharge gazeuse avec un tube de lampe (10) qui est rempli d'un gaz de remplissage qui se trouve sous une pression de remplissage à froid et qui se compose d'un gaz rare ou d'un mélange de gaz rares, en particulier du xénon, et à l'intérieur duquel sont montées deux électrodes en tungstène (12a, 12b) destinées à produire une décharge en arc, le gaz de remplissage étant additionné d'un composé halogéné. L'invention concerne par ailleurs un procédé de fabrication d'une lampe à décharge gazeuse, dans lequel deux électrodes de tungstène (12a, 12b) destinées à la production d'une décharge en arc sont montées à l'intérieur d'un tube de lampe (10) avec un gaz de remplissage qui se trouve sous une pression de remplissage à froid et se compose d'un gaz rare ou d'un mélange de gaz rares, un composé halogéné étant ajouté au gaz de remplissage.
PCT/EP2008/053252 2008-03-19 2008-03-19 Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse Ceased WO2009115116A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2008/053252 WO2009115116A1 (fr) 2008-03-19 2008-03-19 Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse
TW098106922A TW200943371A (en) 2008-03-19 2009-03-04 Gas-discharge lamp and method for the production of a gas-discharge lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/053252 WO2009115116A1 (fr) 2008-03-19 2008-03-19 Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse

Publications (1)

Publication Number Publication Date
WO2009115116A1 true WO2009115116A1 (fr) 2009-09-24

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Application Number Title Priority Date Filing Date
PCT/EP2008/053252 Ceased WO2009115116A1 (fr) 2008-03-19 2008-03-19 Lampe à décharge gazeuse et procédé de fabrication d'une lampe à décharge gazeuse

Country Status (2)

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TW (1) TW200943371A (fr)
WO (1) WO2009115116A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012004166A1 (fr) 2010-07-06 2012-01-12 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à arc court

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4826669B2 (ja) * 2009-11-05 2011-11-30 ウシオ電機株式会社 ショートアーク型放電ランプ
JP4978738B1 (ja) * 2011-01-06 2012-07-18 岩崎電気株式会社 メタルハライドランプ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901151A1 (fr) * 1997-09-04 1999-03-10 Matsushita Electronics Corporation Lampe à décharge à vapeur de mercure à haute pression
EP1282154A2 (fr) * 2001-08-03 2003-02-05 Nec Corporation Lampe à décharge à haute pression
EP1376656A2 (fr) * 2002-06-26 2004-01-02 Matsushita Electric Industrial Co., Ltd. Lampe à mercure à haute pression et unité de lampe
WO2004055862A2 (fr) * 2002-12-18 2004-07-01 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse haute pression sans mercure
US20050122047A1 (en) * 2001-09-28 2005-06-09 Hiroyuki Kato Metal halide lamp, metal halide lamp operating device, and headlamp device for automobiles
EP1607997A1 (fr) * 2003-03-17 2005-12-21 Matsushita Electric Industrial Co., Ltd. Procede de production d'une lampe a decharge haute pression, lampe a decharge haute pression obtenue et unite de lampe utilisant une lampe a decharge haute pression de ce type et affichage d'images
WO2006017270A2 (fr) * 2004-07-13 2006-02-16 Advanced Lighting Technologies Inc. Lampes a halogenure metallise de krypton

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901151A1 (fr) * 1997-09-04 1999-03-10 Matsushita Electronics Corporation Lampe à décharge à vapeur de mercure à haute pression
EP1282154A2 (fr) * 2001-08-03 2003-02-05 Nec Corporation Lampe à décharge à haute pression
US20050122047A1 (en) * 2001-09-28 2005-06-09 Hiroyuki Kato Metal halide lamp, metal halide lamp operating device, and headlamp device for automobiles
EP1376656A2 (fr) * 2002-06-26 2004-01-02 Matsushita Electric Industrial Co., Ltd. Lampe à mercure à haute pression et unité de lampe
WO2004055862A2 (fr) * 2002-12-18 2004-07-01 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse haute pression sans mercure
EP1607997A1 (fr) * 2003-03-17 2005-12-21 Matsushita Electric Industrial Co., Ltd. Procede de production d'une lampe a decharge haute pression, lampe a decharge haute pression obtenue et unite de lampe utilisant une lampe a decharge haute pression de ce type et affichage d'images
WO2006017270A2 (fr) * 2004-07-13 2006-02-16 Advanced Lighting Technologies Inc. Lampes a halogenure metallise de krypton

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012004166A1 (fr) 2010-07-06 2012-01-12 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à arc court
DE102010030992A1 (de) 2010-07-06 2012-01-12 Osram Gesellschaft mit beschränkter Haftung Kurzbogenlampe-Entladungslampe

Also Published As

Publication number Publication date
TW200943371A (en) 2009-10-16

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