EP1817790B1 - High-pressure discharge lamp - Google Patents

High-pressure discharge lamp Download PDF

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Publication number
EP1817790B1
EP1817790B1 EP05817115A EP05817115A EP1817790B1 EP 1817790 B1 EP1817790 B1 EP 1817790B1 EP 05817115 A EP05817115 A EP 05817115A EP 05817115 A EP05817115 A EP 05817115A EP 1817790 B1 EP1817790 B1 EP 1817790B1
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EP
European Patent Office
Prior art keywords
electrode
filament
discharge vessel
molybdenum foil
discharge lamp
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Not-in-force
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EP05817115A
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German (de)
French (fr)
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EP1817790A1 (en
Inventor
Dirk Grundmann
Andreas Naujoks
Conrad Schimke
Frank Werner
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Osram GmbH
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Osram GmbH
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Publication of EP1817790A1 publication Critical patent/EP1817790A1/en
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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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps

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 EP-A 0 858 098 disclosed.
  • This document describes a metal halide high-pressure discharge lamp for a motor vehicle headlight with a discharge vessel made of quartz glass, which has two ends provided with a molybdenum foil seal, and two electrodes which are each connected to one of the molybdenum foil seals and project into the interior of the discharge vessel.
  • a section of the respective electrode, which is arranged in the region of the molybdenum foil seal end of the lamp vessel, outside the molybdenum foil seal, is enclosed by a helix in order to avoid cracks in the quartz glass of the discharge vessel.
  • the pitch of the helix is less than 600 percent and preferably even less than 300 percent.
  • the inner diameter of the helix is at least as large as the electrode diameter and smaller than 1.5 times the electrode diameter.
  • the disadvantage here is that due to the helix between the quartz glass and the electrode cavities may arise, can penetrate into the filling substances from the discharge space. This may damage the molybdenum foil seal.
  • the DE 198 12 298 discloses a high pressure metal halide discharge lamp for a motor vehicle headlamp having a quartz glass discharge vessel having two ends provided with a molybdenum foil seal, and two electrodes respectively connected to one of the molybdenum foil seals and projecting into the interior of the discharge vessel.
  • the electrodes are each surrounded by a helix, wherein the helix in the front, the discharge space facing region has a narrow winding density and is arranged at a distance from the electrode and in the rear, the molybdenum foil seal facing region has a lighter winding density and fits tightly against the electrode.
  • the disadvantage here is the complex production process for the power supply.
  • the US 6,121,729 discloses a high pressure metal halide discharge lamp with electrodes sheathed by a helix, the helix consisting of a high temperature melting gaseous contaminant material and having a slope of 100 to 500 percent.
  • the high-discharge discharge lamp according to the invention has a quartz glass discharge vessel having at least one end provided with a molybdenum foil seal, and at least one electrode connected to the molybdenum foil seal and projecting into the interior of the discharge vessel, wherein a helix having a pitch of greater than or equal to 600 percent is provided, which surrounds a portion of the electrode which is arranged in the region of the molybdenum foil seal provided with the end of the lamp vessel, outside the Mölybdänfblienabdichtung.
  • the softened quartz glass can penetrate between adjacent turns of the coil and wet the surface of the electrode. Because of its relatively large pitch, the helix also has a low heat capacity, so that the quartz glass cools more slowly when flowing around the helix and thus a good seal is achieved.
  • the first and last turns of the helix are wound more tightly than the interposed helix section. It has been found that thereby the desired effect of the helix is not affected.
  • the wire diameter or the wire thickness of the helical wire is advantageously less than 100 micrometers in order not to significantly increase the diameter of the power supply in the region of the electrode section surrounded by the helix.
  • the wire diameter of the helical wire is tuned to the electrode diameter in the range of 0.25 millimeters to 0.4 millimeters, and preferably 0.30 millimeters to 0.35 millimeters, as commonly used in mercury-free metal halide high pressure discharge lamps for automotive headlamps become.
  • the electrodes of this lamp type are designed as pin electrodes.
  • the invention is particularly well suited for high pressure discharge lamps having a comparatively small discharge vessel volume of at most 30 mm 3 , the ionizable filling of which contains metal halides and xenon, and the relatively thick electrodes having a diameter in the range of 0.25 mm to 0.4 mm, such as the above-mentioned, mercury-free metal halide high-pressure discharge lamps for motor vehicle headlights.
  • FIG. 2 shows a sealed by a molybdenum foil seal end 11 of a two-sided sealed discharge vessel 1 of a high pressure discharge lamp for a motor vehicle headlamp according to the preferred embodiment of the invention, including the power supply, which is passed through the closed end 11 of the discharge vessel 1.
  • the lamp is in particular a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of 35 watts.
  • an ionizable filling is arranged, which consists of xenon and the halides of the metals sodium, scandium, zinc and indium.
  • the volume of the discharge vessel is 0.24 mm 3 .
  • the power supply has a molybdenum foil 2 embedded in the gas-tight manner in the closed end 11 of the discharge vessel 1.
  • the molybdenum foil 2 has a length of 6.5 mm, a width of 2 mm and a thickness of 25 ⁇ m.
  • the end facing away from the interior 10 of the discharge vessel 1 of the molybdenum foil 2 is welded to a molybdenum wire 3, which protrudes from the sealed end 11 of the discharge vessel 1.
  • the interior 10 of the discharge vessel 1 facing the end of the molybdenum foil 2 is welded to a rod-shaped, consisting of tungsten electrode 4, which projects into the discharge space 10.
  • the length of the electrode 4 is 7.5 mm and its thickness or its diameter is 0.30 mm.
  • the overlap between the electrode 4 and the molybdenum foil 2 is 1.30 mm ⁇ 0.15 mm.
  • a coil 5 is arranged centrally, so that their distance from the two ends of the electrode 4 is 2.25 mm in each case.
  • the inner diameter of the coil 5 corresponds to the diameter or the thickness of the electrode 4.
  • the coil 5 extends according to the preferred embodiment of the invention, as in FIG. 1 shown schematically, only over the arranged in the closed end 11 of the discharge vessel 1 portion of the electrode 4, which does not overlap with the molybdenum foil 2.
  • the distance of the helix 5 to the molybdenum foil 2 is 0.95 mm. However, the helix 5 can also protrude into the discharge space 10. This does not affect their effect.
  • the other, not shown, closed end of the discharge vessel 1 is formed identical to the end 11. In particular, it also has an electrode as in FIG. 1 or 3 shown. The distance of the protruding into the interior 10 of the discharge vessel 1 ends of the two electrodes is 4.2 mm. The two electrodes are opposite each other, arranged in the longitudinal axis of the discharge vessel 1.
  • FIG. 1 the electrode 4 and the coil 5 of the end 11 of the discharge vessel 1 are shown enlarged. Apart from the first turn 51 and the last turn 52 of the coil 5, the distance L between two adjacent turns is 340 ⁇ m.
  • the high-pressure discharge lamp according to the preferred embodiment further has an outer bulb, which encloses the discharge vessel 1 in the region of the discharge space 10, and a. Lamp base. These details are for example in the EP 1 465 237 A2 described and illustrated.
  • the inner diameter of the helix 5 can also be greater than the diameter of the electrode 4. Good results are also achieved with a helix 5 whose inner diameter is 0.33 mm and which is arranged on an electrode 4 with a diameter of 0.30 mm and is identical in the other dimensions with the helix 5 of the embodiment.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The lamp has a discharge tank (1) made of quartz glass and provided with a molybdenum foil sealant (2) at its end. An electrode (4) is connected with the sealant and extends into interior of the tank. A coil (5) surrounds a section of the electrode and is arranged outside the sealant within area of the end provided with the sealant. A pitch of the coil is greater or equivalent to 600 percent.

Description

Die Erfindung betrifft eine Hochdruckentladungslampe gemäß dem Oberbegriff 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 EP-A 0 858 098 offenbart. Diese Schrift beschreibt eine Halogen-Metalldampf Hochdruckentladungslampe für einen Kraftfahrzeugscheinwerfer mit einem Entladungsgefäß aus Quarzglas, das zwei mit einer Molybdänfolienabdichtung versehene Enden aufweist, und zwei Elektroden, die jeweils mit einer der Molybdänfolienabdichtungen verbunden sind und in den Innenraum des Entladungsgefäßes hineinragen. Ein Abschnitt der jeweiligen Elektrode, der im Bereich des mit der Molybdänfolienabdichtung versehenen Endes des Lampengefäßes, außerhalb der Molybdänfolienabdichtung angeordnet ist, ist von einer Wendel umschlossen, um Risse im Quarzglas des Entladungsgefäßes zu vermeiden. Die Steigung der Wendel ist kleiner als 600 Prozent und vorzugsweise sogar kleiner als 300 Prozent. Der Innendurchmesser der Wendel ist mindestens so groß wie der Elektrodendurchmesser und kleiner als das 1,5-fache des Elektrodendurchmessers. Nachteilig ist hierbei, dass aufgrund der Wendel zwischen dem Quarzglas und der Elektrode Hohlräume entstehen können, in die Füllungssubstanzen aus dem Entladungsraum eindringen können. Dadurch kann die Molybdänfolienabdichtung beschädigt werden.Such a high-pressure discharge lamp is for example in the EP-A 0 858 098 disclosed. This document describes a metal halide high-pressure discharge lamp for a motor vehicle headlight with a discharge vessel made of quartz glass, which has two ends provided with a molybdenum foil seal, and two electrodes which are each connected to one of the molybdenum foil seals and project into the interior of the discharge vessel. A section of the respective electrode, which is arranged in the region of the molybdenum foil seal end of the lamp vessel, outside the molybdenum foil seal, is enclosed by a helix in order to avoid cracks in the quartz glass of the discharge vessel. The pitch of the helix is less than 600 percent and preferably even less than 300 percent. The inner diameter of the helix is at least as large as the electrode diameter and smaller than 1.5 times the electrode diameter. The disadvantage here is that due to the helix between the quartz glass and the electrode cavities may arise, can penetrate into the filling substances from the discharge space. This may damage the molybdenum foil seal.

Die DE 198 12 298 offenbart eine Halogen-Metalldampf-Hochdruckentladungslampe für einen Kraftfahrzeugscheinwerfer mit einem Entladungsgefäß aus Quarzglas, das zwei mit einer Molybdänfolienabdichtung versehene Enden aufweist, und zwei Elektroden, die jeweils mit einer der Molybdänfolienabdichtungen verbunden sind und in den Innenraum des Entladungsgefäßes hineinragen. Die Elektroden sind jeweils von einer Wendel umgeben, wobei die Wendel im vorderem, dem Entladungsraum zugewandten Bereich eine enge Wicklungsdichte besitzt und mit Abstand zur Elektrode angeordnet ist und im hinteren, der Molybdänfolienabdichtung zugewandten Bereich eine lichtere Wicklungsdichte besitzt und eng an der Elektrode anliegt. Nachteilig ist hierbei das aufwändige Herstellungsverfahren für die Stromzuführung.The DE 198 12 298 discloses a high pressure metal halide discharge lamp for a motor vehicle headlamp having a quartz glass discharge vessel having two ends provided with a molybdenum foil seal, and two electrodes respectively connected to one of the molybdenum foil seals and projecting into the interior of the discharge vessel. The electrodes are each surrounded by a helix, wherein the helix in the front, the discharge space facing region has a narrow winding density and is arranged at a distance from the electrode and in the rear, the molybdenum foil seal facing region has a lighter winding density and fits tightly against the electrode. The disadvantage here is the complex production process for the power supply.

Die US 6,121,729 offenbart eine Halogen-Metalldampf-Hochdruckentladungslampe mit Elektroden, deren Schaft von einer Wendel umhüllt ist, wobei die Wendel aus einem bei hoher Temperatur schmelzenden und gasförmige Verunreinigungen absorbierenden Material besteht und eine Steigung von 100 bis 500 Prozent aufweist.The US 6,121,729 discloses a high pressure metal halide discharge lamp with electrodes sheathed by a helix, the helix consisting of a high temperature melting gaseous contaminant material and having a slope of 100 to 500 percent.

I. Darstellung der Erfindung I. Presentation of the invention

Es ist Aufgabe der Erfindung, eine gattungsgemäße Hochdruckentladungslampe mit verbesserten Stromzuführungen bereitzustellen, welche die Nachteile des Standes der Technik vermeiden.It is an object of the invention to provide a generic high-pressure discharge lamp with improved power supply, which avoid the disadvantages of the prior art.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den abhängigen Patentanspruchen 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 Hochdmckentladungslampe besitzt ein Entladungsgefäß aus Quarzglas, das mindestens ein mit einer Molybdänfolienabdichtung versehenes Ende aufweist, und mindestens eine Elektrode, die mit der Molybdänfolienabdichtung verbunden ist und in den Innenraum des Entladungsgefäßes hineinragt, wobei eine Wendel mit einer Steigung von größer oder gleich 600 Prozent vorgesehen ist, die einen Abschnitt der Elektrode umgibt, der im Bereich des mit der Molybdänfolienabdichtung versehenen Endes des Lampengefäßes, außerhalb der Mölybdänfblienabdichtung angeordnet ist. Dadurch wird gewährleistet, dass sich im Bereich der Elektrode im Quarzglas des Endes des Entladungsgefäßes keine, durch die unterschiedliche thermische Ausdehnung des Elektradenmaterials und des Quarzglases bedingten größeren Risse ausbilden können, die zu einem Ausfall der Lampe führen würden, und außerdem auch keine Füllungssubstanzen aus dem Innenraum des Entladungsgefäßes zu den Molybdänfolienabdichtungen vordringen können, die eine Korrosion der Molybdänfolien verursachen würden und damit die Molybdänfolienabdichtungen beschädigen würden.The high-discharge discharge lamp according to the invention has a quartz glass discharge vessel having at least one end provided with a molybdenum foil seal, and at least one electrode connected to the molybdenum foil seal and projecting into the interior of the discharge vessel, wherein a helix having a pitch of greater than or equal to 600 percent is provided, which surrounds a portion of the electrode which is arranged in the region of the molybdenum foil seal provided with the end of the lamp vessel, outside the Mölybdänfblienabdichtung. This ensures that in the area of the electrode in the quartz glass of the end of the discharge vessel, no larger cracks due to the different thermal expansion of the electrode material and the quartz glass, which would lead to a failure of the lamp, and also no filling substances from the Interior of the discharge vessel to the molybdenum foil seals can penetrate, which would cause corrosion of the molybdenum foils and thus damage the molybdenum foil seals.

Aufgrund der relativ großen Steigung der oben genannten Wendel liegen ihre Windungen weit auseinander, so dass beim Abdichten des Endes des Entladungsgefäßes das erweichte Quarzglas zwischen benachbarte Windungen der Wendel eindringen und die Oberfläche der Elektrode benetzen kann. Wegen ihrer relativ großen Steigung besitzt die Wendel ferner eine geringe Wärmekapazität, so dass das Quarzglas beim umfließen der Wendel langsamer abkühlt und so eine gute Abdichtung erreicht wird.Due to the relatively large pitch of the above coil their turns are far apart, so that when sealing the end of the discharge vessel the softened quartz glass can penetrate between adjacent turns of the coil and wet the surface of the electrode. Because of its relatively large pitch, the helix also has a low heat capacity, so that the quartz glass cools more slowly when flowing around the helix and thus a good seal is achieved.

Es wird vermutet, dass sich während des Betriebs der Hochdruckentladungslampe aufgrund der unterschiedlichen thermischen Ausdehnungskoeffizienten von Quarzglas und dem Elektrodenmaterial mikroskopisch kleine Risse in dem die Elektrode umgebenden Quarzglas ausbilden, die aufgrund der Existenz der Wendel nicht zu größeren Rissen, die ein Leck in dem abgedichteten Ende des Entladungsgefäßes verursachen und die Funktionstüchtigkeit der Hochdruckentladungslampe beeinträchtigen würden, anwachsen können.It is believed that during operation of the high pressure discharge lamp due to the different thermal expansion coefficients of quartz glass and the electrode material form microscopic cracks in the quartz glass surrounding the electrode, due to the existence of the coil does not cause large cracks, which is a leak in the sealed end cause the discharge vessel and affect the functionality of the high pressure discharge lamp, can grow.

Aus fertigungstechnischen Gründen sind erfindungsgemäß die erste und letzte Windung der Wendel enger gewickelt als der dazwischen liegende Wendelabschnitt. Es hat sich gezeigt, dass dadurch die gewünschte Wirkung der Wendel nicht beeinträchtigt wird.For manufacturing reasons, according to the invention, the first and last turns of the helix are wound more tightly than the interposed helix section. It has been found that thereby the desired effect of the helix is not affected.

Der Drahtdurchmesser bzw. die Drahtstärke des Wendeldrahtes ist vorteilhafter Weise kleiner als 100 Mikrometer, um den Durchmesser der Stromzuführung im Bereich des von der Wendel umgebenen Elektrodenabschnitts nicht signifikant zu erhöhen. Vorteilhafter Weise ist der Drahtdurchmesser des Wendeldrahtes auf den Elektrodendurchmesser im Bereich von 0,25 Millimeter bis 0,4 Millimeter, und vorzugsweise 0,30 Millimeter bis 0,35 Millimeter, abgestimmt, wie sie üblicherweise bei quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen für Kraftfahrzeugscheinwerfer verwendet werden. Die Elektroden dieses Lampentyps sind als Stiftelektroden ausgebildet.The wire diameter or the wire thickness of the helical wire is advantageously less than 100 micrometers in order not to significantly increase the diameter of the power supply in the region of the electrode section surrounded by the helix. Advantageously, the wire diameter of the helical wire is tuned to the electrode diameter in the range of 0.25 millimeters to 0.4 millimeters, and preferably 0.30 millimeters to 0.35 millimeters, as commonly used in mercury-free metal halide high pressure discharge lamps for automotive headlamps become. The electrodes of this lamp type are designed as pin electrodes.

Die Erfindung eignet sich besonders gut für Hochdruckentladungslampen mit einem vergleichsweise kleinen Entladungsgefäßvolumen von maximal 30 mm3, deren ionisierbare Füllung Metallhalogenide und Xenon enthält und die relativ dicke Elektroden mit einem Durchmesser im Bereich von 0,25 mm bis 0,4 mm, wie beispielsweise die oben erwähnten, quecksilberfreien Halogen-Metalldampf-Hochdruckentladungslampen für Kraftfahrzeugscheinwerfer.The invention is particularly well suited for high pressure discharge lamps having a comparatively small discharge vessel volume of at most 30 mm 3 , the ionizable filling of which contains metal halides and xenon, and the relatively thick electrodes having a diameter in the range of 0.25 mm to 0.4 mm, such as the above-mentioned, mercury-free metal halide high-pressure discharge lamps for motor vehicle headlights.

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 Elektrode für eine Hochdruckentladungslampe gemäß dem bevorzugten Ausführungsbeispiel der Erfindung mit auf der Elektrode angeordneter Wendel
Figur 2
Ein abgedichtetes Ende des Entladungsgefäßes einer Hochdruckentladungslam- pe gemäß dem bevorzugten Ausführungsbeispiel der Erfindung mit der in Figur 1 abgebildeten Elektrode
The invention will be explained in more detail below with reference to a preferred embodiment. Show it:
FIG. 1
An electrode for a high pressure discharge lamp according to the preferred embodiment of the invention having a coil disposed on the electrode
FIG. 2
A sealed end of the discharge vessel of a high-pressure discharge lamp according to the preferred embodiment of the invention with the in FIG. 1 pictured electrode

Die Figur 2 zeigt ein, mittels einer Molybdänfolienabdichtung verschlossenes Ende 11 eines zweiseitig abgedichteten Entladungsgefäßes 1 einer Hochdruckentladungslampe für einen Kraftfahrzeugscheinwerfer gemäß des bevorzugten Ausführungsbeispiels der Erfindung, inklusive der Stromzuführung, die durch das verschlossene Ende 11 des Entladungsgefäßes 1 hindurchgeführt ist. Bei der Lampe handelt es sich insbesondere um eine quecksilberfreie Halogen-Metalldampf-Hochdruckentladungslampe mit einer elektrischen Leistungsaufrxahme von 35 Watt. Im Innenraum 10 des Entladungsgefäßes 1 ist eine ionisierbare Füllung angeordnet, die aus Xenon und den Halogeniden der Metalle Natrium, Scandium, Zink und Indium besteht. Das Volumen des Entladungsgefäßes beträgt 0,24 mm3.The FIG. 2 shows a sealed by a molybdenum foil seal end 11 of a two-sided sealed discharge vessel 1 of a high pressure discharge lamp for a motor vehicle headlamp according to the preferred embodiment of the invention, including the power supply, which is passed through the closed end 11 of the discharge vessel 1. The lamp is in particular a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of 35 watts. In the interior 10 of the discharge vessel 1, an ionizable filling is arranged, which consists of xenon and the halides of the metals sodium, scandium, zinc and indium. The volume of the discharge vessel is 0.24 mm 3 .

Die Stromzuführung weist eine gasdicht in dem verschlossenen Ende 11 des Entladungsgefäßes 1 eingebettete Molybdänfolie 2 auf. Die Molybdänfolie 2 besitzt eine Länge von 6,5 mm, eine Breite von 2 mm und eine Dicke von 25 µm. Das von dem Innenraum 10 des Entladungsgefäßes 1 abgewandte Ende der Molybdänfolie 2 ist mit einem Molybdändraht 3 verschweißt, der aus dem abgedichteten Ende 11 des Entladungsgefäßes 1 herausragt. Das dem Innenraum 10 des Entladungsgefäßes 1 zugewandte Ende der Molybdänfolie 2 ist mit einer stabförmigen, a:us Wolfram bestehenden Elektrode 4 verschweißt, die in den Entladungsraum 10 hineinragt. Die Länge der Elektrode 4 beträgt 7,5 mm und ihre Dicke bzw. ihr Durchmesser 0,30 mm. Der Überlapp zwischen der Elektrode 4 und der Molybdänfolie 2 beträgt 1,30 mm ± 0,15 mm. Auf der Elektrode 4 ist eine Wendel 5 mittig angeordnet, so dass ihr Abstand von den beiden Enden der Elektrode 4 jeweils 2,25 mm beträgt. Die Wendel 5 besitzt eine Länge von 3 mm. Sie besteht aus einem Wolframdraht, dessen Drahtstärke bzw. Drahtdurchmesser D = 60 µm beträgt. Der Innendurchmesser der Wendel 5 entspricht dem Durchmesser bzw. der Dicke der Elektrode 4. Die Wendel 5 erstreckt sich gemäß des bevorzugten Ausführungsbeispiels der Erfindung, wie in Figur 1 schematisch dargestellt, nur über den in dem verschlossenen Ende 11 des Entladungsgefäßes 1 angeordneten Abschnitt der Elektrode 4, der nicht mit der Molybdänfolie 2 überlappt. Der Abstand der Wendel 5 zur Molybdänfolie 2 beträgt 0,95 mm. Die Wendel 5 kann aber auch in den Entladungsraum 10 hineinragen. Dadurch wird ihre Wirkung nicht beeinträchtigt. Das andere, nicht abgebildete verschlossene Ende des Entladungsgefäßes 1 ist identisch zu dem Ende 11 ausgebildet. Insbesondere besitzt es ebenfalls eine Elektrode wie in Figur 1 bzw. 3 dargestellt. Der Abstand der in den Innenraum 10 des Entladungsgefäßes 1 hineinragenden Enden der beiden Elektroden beträgt 4,2 mm. Die beiden Elektroden sind einander gegenüberliegend, in der Längsachse des Entladungsgefäßes 1 angeordnet.The power supply has a molybdenum foil 2 embedded in the gas-tight manner in the closed end 11 of the discharge vessel 1. The molybdenum foil 2 has a length of 6.5 mm, a width of 2 mm and a thickness of 25 μm. The end facing away from the interior 10 of the discharge vessel 1 of the molybdenum foil 2 is welded to a molybdenum wire 3, which protrudes from the sealed end 11 of the discharge vessel 1. The interior 10 of the discharge vessel 1 facing the end of the molybdenum foil 2 is welded to a rod-shaped, consisting of tungsten electrode 4, which projects into the discharge space 10. The length of the electrode 4 is 7.5 mm and its thickness or its diameter is 0.30 mm. The overlap between the electrode 4 and the molybdenum foil 2 is 1.30 mm ± 0.15 mm. On the electrode 4, a coil 5 is arranged centrally, so that their distance from the two ends of the electrode 4 is 2.25 mm in each case. The Wendel 5 has a length of 3 mm. It consists of a tungsten wire whose wire diameter or wire diameter is D = 60 microns. The inner diameter of the coil 5 corresponds to the diameter or the thickness of the electrode 4. The coil 5 extends according to the preferred embodiment of the invention, as in FIG. 1 shown schematically, only over the arranged in the closed end 11 of the discharge vessel 1 portion of the electrode 4, which does not overlap with the molybdenum foil 2. The distance of the helix 5 to the molybdenum foil 2 is 0.95 mm. However, the helix 5 can also protrude into the discharge space 10. This does not affect their effect. The other, not shown, closed end of the discharge vessel 1 is formed identical to the end 11. In particular, it also has an electrode as in FIG. 1 or 3 shown. The distance of the protruding into the interior 10 of the discharge vessel 1 ends of the two electrodes is 4.2 mm. The two electrodes are opposite each other, arranged in the longitudinal axis of the discharge vessel 1.

In Figur 1 sind die Elektrode 4 und die Wendel 5 des Endes 11 des Entladungsgefäßes 1 vergrößert dargestellt. Abgesehen von der ersten Windung 51 und der letzten Windung 52 der Wendel 5 beträgt der Abstand L zwischen zwei benachbarten Windungen 340 µm. Die Steigung S einer Wendel berechnet sich aus dem Abstand L und dem Wendeldrahtdurchmesser D zu S=(L+D)/D. Die Steigung der Wendel 5 beträgt daher, abgesehen von ihrer ersten und letzten Windung, 6,67 bzw. 667 Prozent.In FIG. 1 the electrode 4 and the coil 5 of the end 11 of the discharge vessel 1 are shown enlarged. Apart from the first turn 51 and the last turn 52 of the coil 5, the distance L between two adjacent turns is 340 μm. The pitch S of a helix is calculated from the distance L and the helix wire diameter D to S = (L + D) / D. The pitch of the helix 5 is therefore, apart from its first and last turn, 6.67 and 667 percent, respectively.

Die Hochdruckentladungslampe gemäß dem bevorzugten Ausführungsbeispiel besitzt ferner einen Außenkolben, der das Entladungsgefäß 1 im Bereich des Entladungsraumes 10 umschließt, und einen. Lampensockel. Diese Details sind beispielsweise in der EP 1 465 237 A2 beschrieben und abgebildet.The high-pressure discharge lamp according to the preferred embodiment further has an outer bulb, which encloses the discharge vessel 1 in the region of the discharge space 10, and a. Lamp base. These details are for example in the EP 1 465 237 A2 described and illustrated.

Die Erfindung beschränkt sich nicht auf das oben näher erläuterte Ausführungsbeispiel. Beispielsweise kann der Innendurchmesser der Wendel 5 auch größer als der Durchmesser der Elektrode 4 sein. Gute Resultate werden auch mit einer Wendel 5 erzielt, deren Innendurchmesser 0,33 mm beträgt und die auf eine Elektrode 4 mit einem Durchmesser von 0,30 mm angeordnet ist und in den übrigen Abmessungen mit der Wendel 5 des Ausführungsbeispiels identisch ist.The invention is not limited to the embodiment explained in more detail above. For example, the inner diameter of the helix 5 can also be greater than the diameter of the electrode 4. Good results are also achieved with a helix 5 whose inner diameter is 0.33 mm and which is arranged on an electrode 4 with a diameter of 0.30 mm and is identical in the other dimensions with the helix 5 of the embodiment.

Claims (4)

  1. High-pressure discharge lamp having a discharge vessel (1) consisting of quartz glass, which has at least one end (11) provided with a molybdenum foil seal (2), and having at least one electrode (4), which is connected to the molybdenum foil seal (2) and protrudes into the interior (10) of the discharge vessel (1), a filament (5) being provided which surrounds a section of the electrode (4), which section is arranged in the region of that end (11) of the discharge vessel (1) which is provided with the molybdenum foil seal (2), outside of the molybdenum foil seal (2), characterized in that the pitch S of the filament (5) is greater than or equal to 600 percent, the pitch S being calculated from the distance L between two adjacent turns of the filament (5) and the filament wire diameter D according to the formula S=(L+D)/D, and in that the first and last turns of the filament (5) are more tightly wound than the section of the filament (5) lying therebetween.
  2. High-pressure discharge lamp according to Claim 1, characterized in that the wire diameter of the filament wire of the filament (5) is less than 100 micrometers.
  3. High-pressure discharge lamp according to Claim 1 or 2, characterized in that that section of the at least one electrode (4) which is surrounded by the filament (5) is cylindrical and has a diameter in the region of greater than 0.25 millimeter and less than 0.4 millimeter, preferably in the range from 0.30 millimeter to 0.35 millimeter.
  4. High-pressure discharge lamp according to one or more of Claims 1 to 3, characterized in that the volume of the discharge vessel (1) is less than or equal to 30 mm3, and the ionizable filling arranged in the interior (10) of the discharge vessel contains metal halides and xenon.
EP05817115A 2004-11-30 2005-11-18 High-pressure discharge lamp Not-in-force EP1817790B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004057906A DE102004057906A1 (en) 2004-11-30 2004-11-30 High-pressure discharge lamp for motor vehicle head light, has discharge tank of quartz glass and with molybdenum foil sealant at its end, and coil, whose pitch is greater or equivalent to specified percent, surrounding electrode section
PCT/DE2005/002072 WO2006058513A1 (en) 2004-11-30 2005-11-18 High-pressure discharge lamp

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EP1817790A1 EP1817790A1 (en) 2007-08-15
EP1817790B1 true EP1817790B1 (en) 2009-04-08

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US (1) US7705538B2 (en)
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JP (1) JP4646257B2 (en)
CN (1) CN100573807C (en)
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CA (1) CA2588555A1 (en)
DE (2) DE102004057906A1 (en)
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JP4837605B2 (en) * 2006-11-01 2011-12-14 ハリソン東芝ライティング株式会社 Metal halide lamp
DE102008003907A1 (en) 2008-01-11 2009-07-16 Osram Gesellschaft mit beschränkter Haftung High pressure discharge lamp has filling, which is closed in inner chamber of discharge container, and material that is formed as getter for substance with corrosive effect on molybdenum foil seal
DE102008051825A1 (en) 2008-10-15 2010-04-22 Osram Gesellschaft mit beschränkter Haftung Electrode for a discharge lamp and discharge lamp and method for producing an electrode
DE102009011525A1 (en) 2009-03-03 2010-09-09 Osram Gesellschaft mit beschränkter Haftung Electric lamp and method of manufacture
JP2010272308A (en) * 2009-05-20 2010-12-02 Koito Mfg Co Ltd Discharge lamp for vehicle
US9449806B2 (en) 2009-06-04 2016-09-20 Panasonic Intellectual Property Management Co., Ltd. High-voltage discharge lamp, lamp unit, projection image display device, and method for manufacturing high-voltage discharge lamp
US8610350B2 (en) * 2009-12-15 2013-12-17 Osram Gesellschaft Mit Beschraenkter Haftung Electrode structures for discharge lamps
US9653280B2 (en) * 2009-12-18 2017-05-16 Koninklijke Philips N.V. Electrode for use in a lamp
DE102013211217A1 (en) * 2013-06-14 2014-12-18 Osram Gmbh High pressure discharge lamp
DE102013223708A1 (en) 2013-11-20 2015-05-21 Osram Gmbh High-pressure discharge lamp for motor vehicle headlights
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CA2588555A1 (en) 2006-06-08
US7705538B2 (en) 2010-04-27
CN101065825A (en) 2007-10-31
JP2008522372A (en) 2008-06-26
DE502005007059D1 (en) 2009-05-20
DE102004057906A1 (en) 2006-06-01
WO2006058513A1 (en) 2006-06-08
US20070296339A1 (en) 2007-12-27
ATE428182T1 (en) 2009-04-15
JP4646257B2 (en) 2011-03-09
CN100573807C (en) 2009-12-23
EP1817790A1 (en) 2007-08-15

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