WO2007026288A2 - Lampe a decharge gazeuse haute pression - Google Patents

Lampe a decharge gazeuse haute pression Download PDF

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Publication number
WO2007026288A2
WO2007026288A2 PCT/IB2006/052938 IB2006052938W WO2007026288A2 WO 2007026288 A2 WO2007026288 A2 WO 2007026288A2 IB 2006052938 W IB2006052938 W IB 2006052938W WO 2007026288 A2 WO2007026288 A2 WO 2007026288A2
Authority
WO
WIPO (PCT)
Prior art keywords
pressure gas
gas discharge
discharge lamp
lamp
electrodes
Prior art date
Application number
PCT/IB2006/052938
Other languages
English (en)
Other versions
WO2007026288A3 (fr
Inventor
Michael Haacke
Norbert Lesch
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N. V.
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 Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N. V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2007026288A2 publication Critical patent/WO2007026288A2/fr
Publication of WO2007026288A3 publication Critical patent/WO2007026288A3/fr

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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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
    • 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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • H01J61/526—Heating or cooling particular parts of the lamp heating or cooling of electrodes

Definitions

  • the invention relates to a high-pressure gas discharge lamp particularly for use in vehicles or in other environments that may be particularly sensitive in the way in which they react to electromagnetic interference (EMI).
  • EMI electromagnetic interference
  • high- pressure gas discharge lamps have become widely used.
  • these lamps are used in an environment in which there are other electrical or electronic components, such as in vehicles for example, the risk of these components being electromagnetically affected by, or being subject to electromagnetic interference from, the discharge lamps can no longer be ignored.
  • the risk of such interference is especially high during the starting or switching-on phase.
  • the interference becomes apparent essentially in the form of a noise signal that is superimposed on the lamp voltage or lamp current and that is also emitted and that may considerably detract from the electromagnetic compatibility (EMC) of the lamp. This may cause serious problems particularly when the lamps are used in vehicles, due to the many other electronic components that are present in them.
  • EMC electromagnetic compatibility
  • a general object of the invention is therefore to make it possible for a high- pressure gas discharge lamp to operate even in an environment in which there are components sensitive to electromagnetic interference by making the risk of such interference substantially lower, particularly during the starting or switching-on phase of the lamp.
  • a further object of the invention is to provide a mercury-free high-pressure gas discharge lamp intended particularly for use in vehicles, whose electromagnetic compatibility is substantially better particularly during the starting or switching-on phase.
  • the object is achieved with a high-pressure gas discharge lamp having a means of improving electromagnetic compatibility (EMC) with other electrical or electronic components, particularly during the starting or switching-on phase, by increasing the mean temperature of at least one of the electrodes.
  • the object is also achieved with a high-pressure gas discharge lamp having a means of improving electromagnetic compatibility (EMC) with other electrical or electronic components, particularly during the starting or switching-on phase, by reducing the work function for electrons of the electrode material.
  • the object is achieved with a high-pressure gas discharge lamp having a means of improving electromagnetic compatibility (EMC) with other electrical or electronic components, particularly during the starting or switching-on phase, by increasing the homogeneity of the surface of at least one of the electrodes.
  • EMC electromagnetic compatibility
  • Fig. 1 is a diagrammatic graph of the temperature of the electrodes of a high-pressure gas discharge lamp during the starting or switching-on phase and;
  • Fig. 2 is a diagrammatic longitudinal section through a lamp of this kind.
  • Fig. 1 is a diagrammatic graph showing the curve followed by the temperature of the electrodes of a discharge lamp immediately after it is switched on, with time t in seconds being plotted along the horizontal axis and the temperature T of the electrode tips in degrees Celsius being plotted along the vertical axis.
  • This curve is of the normal form in which there are three temperature zones. Consequently, after approximately 5 to 15 s from the striking of the lamp, the temperature declines relatively steeply from a first, higher value until, after a period of between approximately 30 s and approximately 3 minutes it reaches a second, lower value that indicates the settled or operating state. This decline in temperature is preset chiefly by the dynamic behavior of commercially available ballasts.
  • the sizing of the diameter of the electrode tips is selected to be such that the desired reduction in the emission of electromagnetic interference signals is achieved. If however, to avoid any adverse effect there may be on lifespan or for other reasons, the diameter of the electrode tips is not to be reduced or if the said diameter may not be less than a certain value, and if for this reason it is not possible for a change to be made to the conditions governing temperature then, in a second embodiment, electromagnetic compatibility can be improved by reducing the work function for electrons at the electrodes.
  • a solid state emitter in the electrodes can be achieved by using a solid state emitter in the electrodes.
  • What may be used as an emitter or emitters are for example ThO 2 and/or Y 2 O 3 and/or HfC and/or Sc 2 O 3 and/or Dy 2 O 3 and/or La 2 O 3 and/or CeO 3 and/or ZrO 2 and/or Pr 2 O 3 and/or ZrC, with which material or materials the electrodes are doped. Doping of this kind results in a more severe, and in particular in a faster, reduction of the work function for electrons than is possible with the ThI 4 that is usually introduced into the salt filling of the discharge vessel for this purpose, which means that the ThI 4 is no longer required.
  • the emitter is at once available at the surface of the electrodes, in contrast to ThI 4 that is added to the salt filling, which means that the emitter firstly has to vaporize, which takes a certain amount of time.
  • the electrode temperature may already have dropped appreciably due to the dynamic behavior of the ballast and the transitional phase may thus already have been initiated without there having been any lowering of the work function for the electrons. This results in electromagnetic compatibility being degraded in the way explained above.
  • a particularly homogeneous surface can be obtained for the electrodes by virtue of the fact that no thorium or thorium compounds, and in particular no ThI 4 , is or are introduced into the salt filling of the lamp.
  • the substantially more homogeneous conditioning of the electrode surfaces that is achieved in this way substantially improves the behavior of the lamp as far as EMC is concerned.
  • the complete abandonment of thorium or thorium compounds (such as ThO 2 in particular) even in the electrodes gives the further advantage that the lamp has a high level of environmental compatibility.
  • the electrodes are preferably tungsten-doped electrodes that are doped with potassium and/or aluminum and/or silicon.
  • the electrodes are preferably tungsten-doped electrodes that are doped with potassium and/or aluminum and/or silicon.
  • it also has the further advantage of a longer life, because chemical reactions with the thorium, which may result in corrosion of the electrode feedthroughs within the pinches and thus in speeding up of the occurrence of cracks in the pinches, are avoided.
  • the absence of thorium or thorium compounds in the lamp can be compensated for by a suitable thermal design for the electrodes and/or for the discharge vessel and/or by an adapted pinching or sealing process, to enable any specifications that may be relevant to be met in this way.
  • the amount of salt mixture introduced into the lamp is preferably reduced to a value of between approximately 30% and approximately 60% of the amount that is normally used of between approximately 250 ⁇ g and approximately 350 ⁇ g, and preferably of approximately 300 ⁇ g. Starting from the preferred amount of 300 ⁇ g, this corresponds to a preferred reduction to between approximately 100 ⁇ g and approximately 200 ⁇ g in the case of a discharge vessel having a volume of between approximately 15 ⁇ l and approximately 30 ⁇ l, and preferably of 21 ⁇ l, the maximum inside diameter being between approximately 2 mm and approximately 3 mm, and preferably being 2.4 mm.
  • the salt mixture comprises at least NaI and ScI 3 in this case and, as an option, may contain ZnI 2 , InI and/or ThI 4 in addition. Fig.
  • the mean diameter of the electrode tip is preferably between approximately 200 ⁇ m and approximately 400 ⁇ m. This mean diameter is preferably taken over a length of the electrode tip of approximately 1 mm. What is basically true is that, as was described in connection with the first embodiment, electromagnetic compatibility is all the better the smaller this diameter is. However, at the same time allowance has to be made for the other known characteristics of the lamp that militate against an arbitrary reduction in diameter.
  • a preferred mean diameter for the electrode tip is approximately 340 ⁇ m.
  • the electromagnetic compatibility of a discharge lamp is thus improved by reducing the work function for electrons of the electrode material, by increasing the homogeneity of the surface of the electrodes or by increasing the mean electrode temperature.
  • These three measures may each be taken individually or in any desired combination with one another. The measures or measures selected and their combination will be governed essentially by the application for which the discharge lamp is intended and the desired level of electromagnetic compatibility.

Landscapes

  • Discharge Lamp (AREA)

Abstract

L'invention concerne diverses formes d'exécution de lampes à décharge gazeuse haute pression, dont la compatibilité électromagnétique (EMC) est sensiblement améliorée, en particulier durant la phase de mise en marche ou d'allumage de la lampe, et qui sont particulièrement appropriées pour l'utilisation dans un environnement amené à réagir à une interférence électromagnétique, par exemple, dans des véhicules. Ce résultat est obtenu essentiellement en réduisant la fonction de travail pour les électrons du matériau de l'électrode et/ou en augmentant la température moyenne d'au moins l'une des électrodes et/ou en augmentant l'homogénéité de la surface d'au moins l'une des électrodes.
PCT/IB2006/052938 2005-09-02 2006-08-24 Lampe a decharge gazeuse haute pression WO2007026288A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05108034 2005-09-02
EP05108034.9 2005-09-02

Publications (2)

Publication Number Publication Date
WO2007026288A2 true WO2007026288A2 (fr) 2007-03-08
WO2007026288A3 WO2007026288A3 (fr) 2007-12-06

Family

ID=37809259

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/052938 WO2007026288A2 (fr) 2005-09-02 2006-08-24 Lampe a decharge gazeuse haute pression

Country Status (1)

Country Link
WO (1) WO2007026288A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009040709A3 (fr) * 2007-09-24 2009-06-25 Philips Intellectual Property Lampe à décharge exempte de thorium
DE102008026521A1 (de) 2008-06-03 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Thoriumfreie Hochdruckentladungslampe für Hochfrequenzbetrieb
WO2010128452A1 (fr) * 2009-05-07 2010-11-11 Koninklijke Philips Electronics N.V. Lampe à décharge de gaz haute intensité dépourvue de mercure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914636A (en) * 1973-05-10 1975-10-21 Iwasaki Electric Co Ltd Discharge lamp
US4002940A (en) * 1974-06-12 1977-01-11 U.S. Philips Corporation Electrode for a discharge lamp
US5041041A (en) * 1986-12-22 1991-08-20 Gte Products Corporation Method of fabricating a composite lamp filament
EP0647964A1 (fr) * 1993-10-07 1995-04-12 Koninklijke Philips Electronics N.V. Lampe à décharge à halogénure métallique haute pression
JP2001236923A (ja) * 2000-01-06 2001-08-31 Eg & G Ilc Technology Inc 電磁的干渉を低減させたキセノンアークランプ
WO2004084250A2 (fr) * 2003-03-18 2004-09-30 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914636A (en) * 1973-05-10 1975-10-21 Iwasaki Electric Co Ltd Discharge lamp
US4002940A (en) * 1974-06-12 1977-01-11 U.S. Philips Corporation Electrode for a discharge lamp
US5041041A (en) * 1986-12-22 1991-08-20 Gte Products Corporation Method of fabricating a composite lamp filament
EP0647964A1 (fr) * 1993-10-07 1995-04-12 Koninklijke Philips Electronics N.V. Lampe à décharge à halogénure métallique haute pression
JP2001236923A (ja) * 2000-01-06 2001-08-31 Eg & G Ilc Technology Inc 電磁的干渉を低減させたキセノンアークランプ
WO2004084250A2 (fr) * 2003-03-18 2004-09-30 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009040709A3 (fr) * 2007-09-24 2009-06-25 Philips Intellectual Property Lampe à décharge exempte de thorium
JP2010541129A (ja) * 2007-09-24 2010-12-24 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ トリウムを有さない放電ランプ
DE102008026521A1 (de) 2008-06-03 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Thoriumfreie Hochdruckentladungslampe für Hochfrequenzbetrieb
WO2009147041A2 (fr) * 2008-06-03 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression sans thorium pour un mode de fonctionnement haute fréquence
WO2009147041A3 (fr) * 2008-06-03 2010-03-11 Osram Gesellschaft mit beschränkter Haftung Lampe à décharge à haute pression sans thorium pour un mode de fonctionnement haute fréquence
WO2010128452A1 (fr) * 2009-05-07 2010-11-11 Koninklijke Philips Electronics N.V. Lampe à décharge de gaz haute intensité dépourvue de mercure

Also Published As

Publication number Publication date
WO2007026288A3 (fr) 2007-12-06

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