EP1754245B1 - High-pressure discharge lamp - Google Patents

High-pressure discharge lamp Download PDF

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Publication number
EP1754245B1
EP1754245B1 EP05749222.5A EP05749222A EP1754245B1 EP 1754245 B1 EP1754245 B1 EP 1754245B1 EP 05749222 A EP05749222 A EP 05749222A EP 1754245 B1 EP1754245 B1 EP 1754245B1
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EP
European Patent Office
Prior art keywords
pressure discharge
discharge vessel
discharge
electrodes
discharge lamp
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EP05749222.5A
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German (de)
French (fr)
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EP1754245A2 (en
Inventor
Thomas Bittmann
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Osram GmbH
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Osram GmbH
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    • 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
    • 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
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of patent claim 1.
  • Such a high-pressure discharge lamp is for example in the published patent application EP 0 786 791 A1 described.
  • This publication discloses a single-ended high-pressure discharge lamp for a motor vehicle headlight.
  • the high-pressure discharge lamp has a discharge vessel made of quartz glass, which is sealed at two diametrically arranged ends by means of a respective molybdenum foil.
  • the molybdenum foils are each connected to an electrode, which protrude into the interior of the discharge vessel.
  • High-pressure discharge lamps for motor vehicle headlamps are usually designed as metal halide high-pressure discharge lamps with an electrical power consumption of less than 100 watts, the ionizable filling of which contains halides of sodium and scandium in addition to xenon.
  • the US 2003/178940 A1 discloses a metal halide high pressure discharge lamp for automobile headlamps comprising a pair of tungsten electrodes and metal halide as a major component of the illuminant and xenon as a buffer, wherein the tungsten electrodes contain not more than 0.4 weight percent thoria and the metal halide comprises scandium iodide.
  • the molybdenum foils embedded in the sealed ends of the discharge vessel are subjected to a high thermal load during lamp operation, which in the discharge-side molybdenum foil region connected to the electrode leads to a detachment of the molybdenum foil from the quartz glass and to cracks in the glass and thus to an early start Failure of the lamp can result.
  • This problem occurs in particular in mercury-free metal halide high-pressure discharge lamps whose molybdenum foils are exposed to an even greater thermal load due to the comparatively higher lamp current and the comparatively thicker electrodes than the molybdenum foils of the conventional mercury-containing metal halide high-pressure discharge lamps.
  • the high-pressure discharge lamp according to the invention for vehicle headlights with a power consumption of less than 100 watts has a discharge vessel made of quartz glass, which has two mutually opposite, sealed by molybdenum foils ends, wherein in the interior of the discharge vessel, two electrodes, which are each connected to one of the molybdenum foils, and a xenon As well as halides of sodium and scandium containing, ionizable filling are arranged to generate a gas discharge, and is characterized in that the smallest distance of the respective molybdenum foil to the projecting into the interior of the discharge vessel end of the electrode connected to it is more than 5 mm.
  • the thermal load of the molybdenum foil portion connected to the electrode is reduced sufficiently to reduce the problem described above.
  • mercury-free metal halide high-pressure discharge lamps according to the preferred embodiment of the invention could at a distance of 6.2 mm ⁇ 0.15 mm between the discharge space facing edge of the molybdenum foil and projecting into the discharge space end of the electrode connected to the molybdenum foil the Thermal stress of the discharge end of the molybdenum foils is reduced by about 15%, thereby extending the life of the lamps by about 50%.
  • the invention can be applied to high-pressure discharge lamps whose electrodes during lamp operation due to their dimensions cause a relatively high heat transfer to the molybdenum foils, such as mercury-free metal halide high-pressure discharge lamps whose electrodes have a comparatively large thickness or a relatively large diameter in the range of 0.30 mm to 0.45 mm.
  • the smallest distance of the molybdenum foil in the case of mercury-free metal halide high-pressure discharge lamps is preferably to the end of the electrode connected to it protruding into the interior of the discharge vessel at most 8 mm.
  • the preferred embodiment of the invention is a mercury-free metal halide high pressure discharge lamp having an electrical power consumption of about 35 watts.
  • This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 30 made of quartz glass with a volume of 24 mm 3 , in which an ionizable filling is enclosed gas-tight.
  • the inner contour of the discharge vessel 30 is circular-cylindrical and its outer contour is ellipsoidal.
  • the inner diameter of the discharge space 106 is 2.6 mm and its outer diameter is 6.3 mm.
  • the two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molten or crushed molybdenum foil 103, 104 therein.
  • the molybdenum foils 103, 104 each have a length of 6.5 mm, a width of 2 mm and a thickness of 25 microns.
  • the electrodes 11, 12 are made of tungsten. Their thickness or their diameter is 0.30 mm.
  • the length of the electrodes 11, 12 is 7.5 mm in each case.
  • the distance between the electrodes 11, 12 is 4.1 mm.
  • the electrodes 11, 12 are in each case electrically conductively connected to one of the molybdenum foils 103, 104 and via the base-remote power supply 13 or via the base-side current return 14 to an electrical connection of the lamp base 15 which consists essentially of plastic.
  • the overlap B between the electrode 11 and the molybdenum foil 103 bonded thereto is 1.3 mm ⁇ 0.15 mm.
  • the smallest distance A of the molybdenum foil 103 to the end of the electrode 11 protruding into the interior of the discharge vessel 10 is 6.2 mm ⁇ 0.15 mm. That is, the distance of the molybdenum foil 11 to the discharge arc forming in the discharge vessel 10 during lamp operation is 6.2 mm ⁇ 0.15 mm.
  • the smallest distance of the molybdenum foil 104 to the protruding into the interior of the discharge vessel 10 end of the electrode 12 is also 6.2 mm ⁇ 0.15 mm, because the discharge vessel 10 with the electrodes 11, 12 and the sealed ends 101, 102nd is formed substantially mirror-symmetrical to a plane passing through the discharge vessel center and oriented perpendicular to the longitudinal axis of the discharge vessel 10 mirror axis.
  • the maximum temperature load on the molybdenum foils 103, 104 could be less than 475 ° C be limited.
  • the discharge vessel 10 is surrounded by an outer bulb 16, the Quartz glass or tempered glass.
  • the quartz glass or hard glass of the outer bulb 16 is provided with the usual UV-absorbing additives.
  • the outer bulb 16 has an extension 161 anchored in the base 15.
  • the outer diameter of the outer bulb 16 is 9 mm and its wall thickness is 0.9 mm.
  • the discharge vessel 10 has a tube-like extension 105 made of quartz glass on the base side, in which the socket-side power supply 14 extends.
  • the electrodes 11, 12, the molybdenum foils 103, 104 and / or power supply lines 13, 14 may be coated with ruthenium in the region of the sealed ends 101, 102 of the discharge vessel 10.
  • the ionizable filling included in the discharge vessel consists of xenon having a cold filling pressure of 11800 hPa, 0.25 mg of sodium iodide, 0.18 mg of scandium iodide, 0.03 mg of zinc iodide and 0.0024 mg of indium iodide.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Die Erfindung betrifft eine Hochdruckentladungslampe gemäß des Oberbegriffs des Patentanspruchs 1.The invention relates to a high-pressure discharge lamp according to the preamble of patent claim 1.

I. Stand der Technik I. State of the art

Eine derartige Hochdruckentladungslampe ist beispielsweise in der Offenlegungsschrift EP 0 786 791 A1 beschrieben. Diese Offenlegungsschrift offenbart eine einseitig gesockelte Hochdruckentladungslampe für einen Kraftfahrzeugscheinwerfer. Die Hochdruckentladungslampe besitzt ein Entladungsgefäß aus Quarzglas, das an zwei diametral angeordneten Enden mittels jeweils einer Molybdänfolie abgedichtet ist. Die Molybdänfolien sind jeweils mit einer Elektrode verbunden, die in den Innenraum des Entladungsgefäßes hineinragen. Hochdruckentladungslampen für Kraftfahrzeugscheinwerfer sind üblicherweise als Halogen-Metalldampf-Hochdruckentladungslampen mit einer elektrischen Leistungsaufnahme kleiner als 100 Watt ausgebildet, deren ionisierbare Füllung neben Xenon Halogenide von Natrium und Scandium enthält.Such a high-pressure discharge lamp is for example in the published patent application EP 0 786 791 A1 described. This publication discloses a single-ended high-pressure discharge lamp for a motor vehicle headlight. The high-pressure discharge lamp has a discharge vessel made of quartz glass, which is sealed at two diametrically arranged ends by means of a respective molybdenum foil. The molybdenum foils are each connected to an electrode, which protrude into the interior of the discharge vessel. High-pressure discharge lamps for motor vehicle headlamps are usually designed as metal halide high-pressure discharge lamps with an electrical power consumption of less than 100 watts, the ionizable filling of which contains halides of sodium and scandium in addition to xenon.

Die US 2003/178940 A1 offenbart eine Halogenmetalldampf-Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer mit einem Paar von Wolframelektroden und Metallhalogenid als Hauptkomponente des Leuchtmittels sowie Xenon als Puffer, wobei die Wolframelektroden nicht mehr als 0,4 Gewichtsprozent Thoriumoxid enthalten und das Metallhalogenid Scandiumjodid umfasst.The US 2003/178940 A1 discloses a metal halide high pressure discharge lamp for automobile headlamps comprising a pair of tungsten electrodes and metal halide as a major component of the illuminant and xenon as a buffer, wherein the tungsten electrodes contain not more than 0.4 weight percent thoria and the metal halide comprises scandium iodide.

Bei den vorgenannten Hochdruckentladungslampen werden die in den abgedichteten Enden des Entladungsgefäßes eingebetteten Molybdänfolien während des Lampenbetriebs einer hohen thermischen Belastung ausgesetzt, die im entladungsseitigen, mit der Elektrode verbundenen Molybdänfolienbereich zu einer Abhebung der Molybdänfolie von dem Quarzglas und zu Sprüngen im Glas und damit zu einem frühzeitigen Ausfall der Lampe führen kann. Dieses Problem tritt insbesondere bei quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen auf, deren Molybdänfolien aufgrund des vergleichsweise höheren Lampenstroms und der vergleichsweise dickeren Elektroden einer noch stärkeren thermischen Belastung ausgesetzt sind, als die Molybdänfolien der konventionellen quecksilberhaltigen Halogen-Metalldampf-Hochdruckentladungslampen.In the abovementioned high-pressure discharge lamps, the molybdenum foils embedded in the sealed ends of the discharge vessel are subjected to a high thermal load during lamp operation, which in the discharge-side molybdenum foil region connected to the electrode leads to a detachment of the molybdenum foil from the quartz glass and to cracks in the glass and thus to an early start Failure of the lamp can result. This problem occurs in particular in mercury-free metal halide high-pressure discharge lamps whose molybdenum foils are exposed to an even greater thermal load due to the comparatively higher lamp current and the comparatively thicker electrodes than the molybdenum foils of the conventional mercury-containing metal halide high-pressure discharge lamps.

II. Darstellung der Erfindung II. Presentation of the invention

Es ist die Aufgabe der Erfindung, eine gattungsgemäße Hochdruckentladungslampe bereitzustellen, deren Molybdänfolieneinbettungen während des Lampenbetriebs einer geringeren thermischen Belastung ausgesetzt sind, um insbesondere bei quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen eine Verlängerung ihrer Lebensdauer zu erzielen.It is the object of the invention to provide a generic high-pressure discharge lamp whose Molybdänfolieneinbettungen are exposed during operation of the lamp of a lower thermal load to achieve an extension of their life, especially in mercury-free metal halide high-pressure discharge lamps.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den abhängigen Patentansprüchen beschrieben.This object is achieved by the features of claim 1. Particularly advantageous embodiments of the invention are described in the dependent claims.

Die erfindungsgemäße Hochdruckentladungslampe für Fahrzeugscheinwerfer mit einer Leistungsaufnahme kleiner als 100 Watt besitzt ein Entladungsgefäß aus Quarzglas, das zwei einander gegenüberliegende, mittels Molybdänfolien abgedichtete Enden aufweist, wobei in dem Innenraum des Entladungsgefäßes zwei Elektroden, die jeweils mit einer der Molybdänfolien verbunden sind, und eine Xenon sowie Halogenide von Natrium und Scandium enthaltende, ionisierbare Füllung zum Erzeugen einer Gasentladung angeordnet sind, und zeichnet sich dadurch aus, dass der geringste Abstand der jeweiligen Molybdänfolie zu dem in den Innenraum des Entladungsgefäßes hineinragenden Ende der mit ihr verbundenen Elektrode mehr als 5 mm beträgt. Dadurch wird die thermische Belastung des mit der Elektrode verbundenen Molybdänfolienbereiches im ausreichenden Maß reduziert, um das oben beschriebene Problem zu verringern. Insbesondere bei quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen gemäß des bevorzugten Ausführungsbeispiels der Erfindung konnte bei einem Abstand von 6,2 mm ± 0,15 mm zwischen der dem Entladungsraum zugewandten Kante der Molybdänfolie und dem in den Entladungsraum hineinragenden Ende der mit der Molybdänfolie verbundenen Elektrode die thermische Belastung des entladungsseitigen Endes der Molybdänfolien um ca. 15% reduziert und dadurch die Lebensdauer der Lampen um ca. 50% verlängert werden.The high-pressure discharge lamp according to the invention for vehicle headlights with a power consumption of less than 100 watts has a discharge vessel made of quartz glass, which has two mutually opposite, sealed by molybdenum foils ends, wherein in the interior of the discharge vessel, two electrodes, which are each connected to one of the molybdenum foils, and a xenon As well as halides of sodium and scandium containing, ionizable filling are arranged to generate a gas discharge, and is characterized in that the smallest distance of the respective molybdenum foil to the projecting into the interior of the discharge vessel end of the electrode connected to it is more than 5 mm. Thereby, the thermal load of the molybdenum foil portion connected to the electrode is reduced sufficiently to reduce the problem described above. In particular, in mercury-free metal halide high-pressure discharge lamps according to the preferred embodiment of the invention could at a distance of 6.2 mm ± 0.15 mm between the discharge space facing edge of the molybdenum foil and projecting into the discharge space end of the electrode connected to the molybdenum foil the Thermal stress of the discharge end of the molybdenum foils is reduced by about 15%, thereby extending the life of the lamps by about 50%.

Besonders vorteilhaft kann die Erfindung auf Hochdruckentladungslampen angewandt werden, deren Elektroden während des Lampenbetriebs aufgrund ihrer Abmessungen einen vergleichsweise hohen Wärmeübertrag auf die Molybdänfolien verursachen, wie beispielsweise quecksilberfreie Halogen-Metalldampf-Hochdruckentladungslampen, deren Elektroden eine vergleichsweise große Dicke bzw. einen vergleichsweise großen Durchmesser im Bereich von 0,30 mm bis 0,45 mm.Particularly advantageous, the invention can be applied to high-pressure discharge lamps whose electrodes during lamp operation due to their dimensions cause a relatively high heat transfer to the molybdenum foils, such as mercury-free metal halide high-pressure discharge lamps whose electrodes have a comparatively large thickness or a relatively large diameter in the range of 0.30 mm to 0.45 mm.

Damit nicht ein zu großer Teil der ionisierbaren Füllung durch Diffusion in die Hohlräume zwischen den Elektroden und dem Quarzglas der abgedichteten Enden des Entladungsgefäßes wegen der vergleichsweise langen Elektroden der erfindungsgemäßen Hochdruckentladungslampen für die Gasentladung zwischen den beiden Elektroden im Innenraum des Entladungsgefäßes verloren ist und um auch die Gefahr von durch die thermische Ausdehnung der vom Quarzglas der abgedichteten Enden umschlossenen Elektrodenabschnitte verursachten Sprüngen im Quarzglas gering zu halten, beträgt der geringste Abstand der Molybdänfolie bei quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen zu dem in den Innenraum des Entladungsgefäßes hineinragenden Ende der mit ihr verbundenen Elektrode vorzugsweise höchstens 8 mm.So that not too much of the ionizable filling is lost by diffusion into the cavities between the electrodes and the quartz glass of the sealed ends of the discharge vessel because of the comparatively long electrodes of the high-pressure discharge lamps according to the invention for the gas discharge between the two electrodes in the interior of the discharge vessel and around the To minimize the risk of cracks in the quartz glass caused by the thermal expansion of the electrode sections enclosed by the quartz glass of the sealed ends, the smallest distance of the molybdenum foil in the case of mercury-free metal halide high-pressure discharge lamps is preferably to the end of the electrode connected to it protruding into the interior of the discharge vessel at most 8 mm.

II. Beschreibung des bevorzugten Ausführungsbeispiels II. Description of the Preferred Embodiment

Nachstehend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen:

Figur 1
Eine Seitenansicht einer Hochdruckentladungslampe gemäß des bevorzugten Ausführungsbeispiels in schematischer Darstellung
Figur 2
Das Entladungsgefäß der in Figur 1 abgebildeten Hochdruckentladungslampe mit Maßen für die Elektroden und Molybdänfolien
The invention will be explained in more detail below with reference to a preferred embodiment. Show it:
FIG. 1
A side view of a high-pressure discharge lamp according to the preferred embodiment in a schematic representation
FIG. 2
The discharge vessel of in FIG. 1 pictured high pressure discharge lamp with dimensions for the electrodes and molybdenum foils

Bei dem bevorzugten Ausführungsbeispiel der Erfindung handelt es sich um eine quecksilberfreie Halogen-Metalldampf-Hochdruckentladungslampe mit einer elektrischen Leistungsaufnahme von ungefähr 35 Watt. Diese Lampe ist für den Einsatz in einem Fahrzeugscheinwerfer vorgesehen. Sie besitzt ein zweiseitig abgedichtetes Entladungsgefäß 30 aus Quarzglas mit einem Volumen von 24 mm3, in dem eine ionisierbare Füllung gasdicht eingeschlossen ist. Im Bereich des Entladungsraumes 106 ist die Innenkontur des Entladungsgefäßes 30 kreiszylindrisch und seine Außenkontur ellipsoidförmig ausgebildet. Der Innendurchmesser des Entladungsraumes 106 beträgt 2,6 mm und sein Außendurchmesser beträgt 6,3 mm. Die beiden Enden 101, 102 des Entladungsgefäßes 10 sind jeweils mittels einer darin eingeschmolzenen oder eingequetschten Molybdänfolie 103, 104 abgedichtet. Die Molybdänfolien 103, 104 besitzen jeweils eine Länge von 6,5 mm, eine Breite von 2 mm und eine Dicke von 25 µm. Im Innenraum des Entladungsgefäßes 10 befinden sich zwei Elektroden 11, 12, zwischen denen sich während des Lampenbetriebes der für die Lichtemission verantwortliche Entladungsbogen ausbildet. Die Elektroden 11, 12 bestehen aus Wolfram. Ihre Dicke bzw. ihr Durchmesser beträgt 0,30 mm. Die Länge der Elektroden 11, 12 beträgt jeweils 7,5 mm. Der Abstand zwischen den Elektroden 11, 12 beträgt 4,1 mm. Die Elektroden 11, 12 sind jeweils über eine der Molybdänfolien 103, 104 und über die sockelferne Stromzuführung 13 bzw. über die sockelseitige Stromrückführung 14 elektrisch leitend mit einem elektrischen Anschluss des im wesentlichen aus Kunststoff bestehenden Lampensockels 15 verbunden. Der Überlapp B zwischen der Elektrode 11 und der mit ihr verbundenen Molybdänfolie 103 beträgt 1,3 mm ± 0,15 mm. Der geringste Abstand A der Molybdänfolie 103 zu dem in den Innenraum des Entladungsgefäßes 10 hineinragenden Ende der Elektrode 11 beträgt 6,2 mm ± 0,15 mm. Das heißt, der Abstand der Molybdänfolie 11 zu dem sich während des Lampenbetriebs in dem Entladungsgefäß 10 ausbildenden Entladungsbogen beträgt 6,2 mm ± 0,15 mm. Analog dazu beträgt der geringste Abstand der Molybdänfolie 104 zu dem in den Innenraum des Entladungsgefäßes 10 hineinragenden Ende der Elektrode 12 ebenfalls 6,2 mm ± 0,15 mm, weil das Entladungsgefäß 10 mit den Elektroden 11, 12 und den abgedichteten Enden 101, 102 im wesentlichen spiegelsymmetrisch zu einer durch die Entladungsgefäßmitte verlaufenden und senkrecht zur Längsachse des Entladungsgefäßes 10 orientierten Spiegelachse ausgebildet ist. Mit dem Abstand von 6,2 mm zwischen der entladungsseitigen Kante der Molybdänfolie 103 bzw. 104 und dem in den Innenraum 106 des Entladungsgefäßes 10 hineinragenden Ende der Elektrode 11 bzw. 12 konnte die maximale Temperaturbelastung an den Molybdänfolien 103, 104 auf weniger als 475°C begrenzt werden. Das Entladungsgefäß 10 wird von einem Außenkolben 16 umhüllt, der aus Quarzglas oder Hartglas besteht. Das Quarzglas oder Hartglas des Außenkolbens 16 ist mit den üblichen UV-Strahlung absorbierenden Zusätzen versehen. Der Außenkolben 16 besitzt einen im Sockel 15 verankerten Fortsatz 161. Der Außendurchmesser des Außenkolbens 16 beträgt 9 mm und seine Wandstärke 0,9 mm. Das Entladungsgefäß 10 weist sockelseitig eine rohrartige Verlängerung 105 aus Quarzglas auf, in der die sockelseitige Stromzuführung 14 verläuft. Die Elektroden 11, 12, die Molybdänfolien 103, 104 und bzw. oder Stromzuführungen 13, 14 können im Bereich der abgedichteten Enden 101, 102 des Entladungsgefäßes 10 mit Ruthenium beschichtet sein.The preferred embodiment of the invention is a mercury-free metal halide high pressure discharge lamp having an electrical power consumption of about 35 watts. This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 30 made of quartz glass with a volume of 24 mm 3 , in which an ionizable filling is enclosed gas-tight. In the area of the discharge space 106, the inner contour of the discharge vessel 30 is circular-cylindrical and its outer contour is ellipsoidal. The inner diameter of the discharge space 106 is 2.6 mm and its outer diameter is 6.3 mm. The two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molten or crushed molybdenum foil 103, 104 therein. The molybdenum foils 103, 104 each have a length of 6.5 mm, a width of 2 mm and a thickness of 25 microns. In the interior of the discharge vessel 10 are two electrodes 11, 12, between which forms during the lamp operation responsible for the light emission discharge arc. The electrodes 11, 12 are made of tungsten. Their thickness or their diameter is 0.30 mm. The length of the electrodes 11, 12 is 7.5 mm in each case. The distance between the electrodes 11, 12 is 4.1 mm. The electrodes 11, 12 are in each case electrically conductively connected to one of the molybdenum foils 103, 104 and via the base-remote power supply 13 or via the base-side current return 14 to an electrical connection of the lamp base 15 which consists essentially of plastic. The overlap B between the electrode 11 and the molybdenum foil 103 bonded thereto is 1.3 mm ± 0.15 mm. The smallest distance A of the molybdenum foil 103 to the end of the electrode 11 protruding into the interior of the discharge vessel 10 is 6.2 mm ± 0.15 mm. That is, the distance of the molybdenum foil 11 to the discharge arc forming in the discharge vessel 10 during lamp operation is 6.2 mm ± 0.15 mm. Similarly, the smallest distance of the molybdenum foil 104 to the protruding into the interior of the discharge vessel 10 end of the electrode 12 is also 6.2 mm ± 0.15 mm, because the discharge vessel 10 with the electrodes 11, 12 and the sealed ends 101, 102nd is formed substantially mirror-symmetrical to a plane passing through the discharge vessel center and oriented perpendicular to the longitudinal axis of the discharge vessel 10 mirror axis. With the distance of 6.2 mm between the discharge-side edge of the molybdenum foil 103 and 104 and in the interior 106 of the discharge vessel 10 projecting end of the electrode 11 and 12, the maximum temperature load on the molybdenum foils 103, 104 could be less than 475 ° C be limited. The discharge vessel 10 is surrounded by an outer bulb 16, the Quartz glass or tempered glass. The quartz glass or hard glass of the outer bulb 16 is provided with the usual UV-absorbing additives. The outer bulb 16 has an extension 161 anchored in the base 15. The outer diameter of the outer bulb 16 is 9 mm and its wall thickness is 0.9 mm. The discharge vessel 10 has a tube-like extension 105 made of quartz glass on the base side, in which the socket-side power supply 14 extends. The electrodes 11, 12, the molybdenum foils 103, 104 and / or power supply lines 13, 14 may be coated with ruthenium in the region of the sealed ends 101, 102 of the discharge vessel 10.

Die in dem Entladungsgefäß eingeschlossene ionisierbare Füllung besteht aus Xenon mit einem Kaltfülldruck von 11800 hPa, 0,25 mg Natriumjodid, 0,18 mg Scandiumjodid, 0,03 mg Zinkjodid und 0,0024 mg Indiumjodid. Die Brennspannung U der Lampe beträgt 45 Volt. Ihre Farbtemperatur beträgt 4000 Kelvin, ihr Farbort liegt in der Normfarbtafel nach DIN 5033 bei den Farbkoordinaten x=0,383 und y=0,389. Ihr Farbwiedergabeindex beträgt 65 und ihre Lichtausbeute beträgt 90 lm/W.The ionizable filling included in the discharge vessel consists of xenon having a cold filling pressure of 11800 hPa, 0.25 mg of sodium iodide, 0.18 mg of scandium iodide, 0.03 mg of zinc iodide and 0.0024 mg of indium iodide. The burning voltage U of the lamp is 45 volts. Its color temperature is 4000 Kelvin, its color locus is in the standard color chart according to DIN 5033 with the color coordinates x = 0.383 and y = 0.389. Its color rendering index is 65 and its luminous efficacy is 90 lm / W.

Claims (1)

  1. High-pressure discharge lamp for vehicle headlights having a power consumption of less than 100 watts, the high-pressure discharge lamp having a discharge vessel (10), which consists of quartz glass and has two opposite ends (101, 102), which are sealed off by means of molybdenum foils (103, 104), two electrodes (11, 12), which are each connected to one of the molybdenum foils (103, 104), and an ionizable filling, which contains xenon and halides of sodium, scandium, for producing a gas discharge being arranged in the interior (106) of the discharge vessel (10), and the smallest distance (A) from the respective molybdenum foil (103, 104) to that end of the electrode (11, 12) connected to it which protrudes into the interior (106) of the discharge vessel (10) being more than 5 mm,
    characterized in that
    the high-pressure discharge lamp is designed as a mercury-free metal-halide high-pressure discharge lamp, the ionizable filling of which contains iodides of sodium, scandium, zinc and indium, the smallest distance (A) from the respective molybdenum foil (103, 104) to that end of the electrode (11, 12) connected to it which protrudes into the interior (106) of the discharge vessel (10) is in the range of from 6 mm to 8 mm, and the thickness or the diameter of the electrodes (11, 12) is in the range of from 0.30 mm to 0.45 mm.
EP05749222.5A 2004-05-13 2005-04-29 High-pressure discharge lamp Not-in-force EP1754245B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024063A DE102004024063A1 (en) 2004-05-13 2004-05-13 High pressure discharge lamp
PCT/DE2005/000792 WO2005112074A2 (en) 2004-05-13 2005-04-29 High-pressure discharge lamp

Publications (2)

Publication Number Publication Date
EP1754245A2 EP1754245A2 (en) 2007-02-21
EP1754245B1 true EP1754245B1 (en) 2017-08-30

Family

ID=35267468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05749222.5A Not-in-force EP1754245B1 (en) 2004-05-13 2005-04-29 High-pressure discharge lamp

Country Status (7)

Country Link
US (1) US20070222387A1 (en)
EP (1) EP1754245B1 (en)
JP (1) JP2007537564A (en)
CN (1) CN101036214B (en)
CA (1) CA2566035A1 (en)
DE (1) DE102004024063A1 (en)
WO (1) WO2005112074A2 (en)

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Publication number Priority date Publication date Assignee Title
DE102007018614A1 (en) 2007-04-19 2008-10-23 Osram Gesellschaft mit beschränkter Haftung High pressure discharge lamp and vehicle headlight with high pressure discharge lamp
WO2008142643A2 (en) * 2007-05-24 2008-11-27 Philips Intellectual Property & Standards Gmbh Lamp and headlight unit for a motor vehicle
DE102007043165A1 (en) 2007-09-11 2009-03-12 Osram Gesellschaft mit beschränkter Haftung High pressure discharge lamp for use in vehicle headlight, has ionizable filling containing xenon halides of zinc, where portion of zinc halide in ionizable filling is smaller or equal to specific value of discharge vessel volume
DE102008014096A1 (en) 2008-03-05 2009-09-10 Osram Gesellschaft mit beschränkter Haftung Tungsten electrode for high-pressure discharge lamps and high-pressure discharge lamp with a tungsten electrode
DE102008013607B3 (en) * 2008-03-11 2010-02-04 Blv Licht- Und Vakuumtechnik Gmbh Mercury-free metal halide high pressure discharge lamp
EP2269211B1 (en) * 2008-04-14 2012-02-01 Philips Intellectual Property & Standards GmbH High efficiency discharge lamp
DE102008026521A1 (en) 2008-06-03 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Thorium-free high-pressure discharge lamp for high-frequency operation
US8729802B2 (en) * 2010-01-28 2014-05-20 Koninklijke Philips N.V. Burner with reduced height and method of manufacturing a burner
CN104183466A (en) * 2013-05-28 2014-12-03 海洋王照明科技股份有限公司 Ceramic halogen lamp
DE102013223708A1 (en) 2013-11-20 2015-05-21 Osram Gmbh High-pressure discharge lamp for motor vehicle headlights
JP2017098009A (en) * 2015-11-20 2017-06-01 東芝ライテック株式会社 Discharge lamp

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JP2650463B2 (en) * 1989-05-31 1997-09-03 岩崎電気株式会社 Metal halide lamp
JPH11238488A (en) * 1997-06-06 1999-08-31 Toshiba Lighting & Technology Corp Metal halide discharge lamp, metal halide discharge lamp lighting device and lighting system
DE19731168A1 (en) * 1997-07-21 1999-01-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Illumination system
JP3718077B2 (en) * 1999-03-16 2005-11-16 松下電器産業株式会社 Metal halide lamp
JP3759498B2 (en) * 2001-03-30 2006-03-22 松下電器産業株式会社 Metal halide lamp for automotive headlamp
JP2003282021A (en) * 2002-03-25 2003-10-03 Toshiba Lighting & Technology Corp Manufacturing method of high-pressure discharge lamp and quartz glass bulb for lamp and illumination device

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Also Published As

Publication number Publication date
WO2005112074A3 (en) 2007-04-19
US20070222387A1 (en) 2007-09-27
DE102004024063A1 (en) 2005-12-01
JP2007537564A (en) 2007-12-20
CN101036214A (en) 2007-09-12
CA2566035A1 (en) 2005-11-24
EP1754245A2 (en) 2007-02-21
CN101036214B (en) 2011-06-22
WO2005112074A2 (en) 2005-11-24

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