EP1756853A1 - Electrode for a discharge lamp and discharge lamp - Google Patents

Electrode for a discharge lamp and discharge lamp

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Publication number
EP1756853A1
EP1756853A1 EP05752440A EP05752440A EP1756853A1 EP 1756853 A1 EP1756853 A1 EP 1756853A1 EP 05752440 A EP05752440 A EP 05752440A EP 05752440 A EP05752440 A EP 05752440A EP 1756853 A1 EP1756853 A1 EP 1756853A1
Authority
EP
European Patent Office
Prior art keywords
electrode
shaft
discharge lamp
head
electrode according
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.)
Granted
Application number
EP05752440A
Other languages
German (de)
French (fr)
Other versions
EP1756853B1 (en
Inventor
Thomas Bittmann
Bodo Mittler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1756853A1 publication Critical patent/EP1756853A1/en
Application granted granted Critical
Publication of EP1756853B1 publication Critical patent/EP1756853B1/en
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Anticipated expiration legal-status Critical

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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
    • H01J61/0732—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

Definitions

  • the invention relates to an electrode for a discharge lamp according to the preamble of claim 1 and a discharge lamp with such electrodes.
  • Such an electrode and a discharge lamp with such an electrode are disclosed, for example, in the published patent application WO 03/060947 A2.
  • This document describes a two-part electrode with a cylindrical shaft and a cylindrical head, wherein the shaft and the head of the electrode have different diameters and / or consist of different materials.
  • This electrode is used in a high-pressure discharge lamp for vehicle headlights.
  • the electrode according to the invention has an elongated shaft and a head which is arranged at one end of the shaft, the shaft being flattened according to the invention, so that its dimensions transverse to its longitudinal extent are at most as large as the corresponding transverse dimensions of the head.
  • the flattened shaft is easier to weld with other metal parts, especially with molybdenum melting foils, because there is a larger o surface for the welded connection is available.
  • the shaft has a lower mass than the head part and thus also a correspondingly lower heat capacity, so that only a comparatively small amount of energy in the form of heat is dissipated from the discharge via the shaft in the form of heat.
  • the electrode according to the invention is advantageously only flattened on one side or on two opposite sides.
  • the electrode is flattened in the region of the shaft by machining material, preferably by milling or grinding, or by evaporation of material, preferably by laser.
  • machining material preferably by milling or grinding
  • evaporation of material preferably by laser.
  • the electrode according to the invention can also be formed in one piece in the region of the shaft and head, and therefore in particular no welding between the shaft and head is required.
  • the electrode according to the invention has improved mechanical stability compared to a multi-part electrode.
  • the transition from the head to the shaft of the electrode according to the invention is advantageously made as moderately as possible.
  • the transition is preferably carried out by means of a radius, the value of which is preferably in a range from 0.3 mm to 0.5 mm.
  • the electrode according to the invention is preferably used as a gas discharge electrode for discharge lamps, in particular high-pressure discharge lamps with a discharge vessel made of quartz glass, which is provided with molybdenum foil seals.
  • the dimension of the shaft of the electrode according to the invention preferably has a value in the range from 50 ⁇ m to 350 ⁇ m along a first spatial direction oriented transverse to the longitudinal direction of the electrode and has a second spatial direction oriented perpendicular to the longitudinal direction of the electrode and perpendicular to the first spatial direction is a value in the range from 200 ⁇ m to 450 ⁇ m.
  • Such electrodes are suitable for use in metal halide high-pressure discharge lamps for motor vehicle headlights, which have a comparatively se have a low power consumption of approx.
  • the electrode according to the invention preferably consists of tungsten, a tungsten alloy or tungsten provided with dopants in order to be able to withstand the high temperatures of a gas discharge in a high-pressure discharge lamp.
  • the electrode according to the invention is preferably designed as a pin electrode.
  • the head of the electrode can be provided with a helix in order to increase the heat capacity of the head.
  • the entire shaft or a section of the shaft of the electrode according to the invention can be coated with ruthenium in order to reduce the risk of cracks or cracks occurring in the region of the discharge vessel in which the shaft of the electrode is closely embedded in the discharge vessel material.
  • Figure 1 is a side view of an electrode according to the first embodiment of the invention and a molybdenum foil welded to it in a schematic representation
  • FIG. 2 A second side view of the electrode and molybdenum foil shown in FIG. 1 in a view rotated by an angle of 90 degrees around the longitudinal axis of the electrode compared to FIG. 1
  • Figure 3 is a plan view of the face of the shaft of the electrode shown in Figure 1
  • FIG. 4 shows a side view of an electrode according to the second exemplary embodiment of the invention and a molybdenum foil welded to it in a schematic representation
  • FIG. 5 A second side view of the electrode and molybdenum foil shown in FIG. 4 in a view rotated by an angle of 90 degrees around the longitudinal axis of the electrode compared to FIG. 4
  • Figure 6 is a side view of an electrode according to a third embodiment of the invention in a schematic representation
  • FIG. 7 shows a side view of a high-pressure discharge lamp with the electrodes according to the invention
  • the electrodes shown schematically in FIGS. 1 to 6 according to the preferred exemplary embodiments of the invention are intended for use in the high-pressure metal halide discharge lamp shown schematically in FIG.
  • the electrode 11 according to the first exemplary embodiment of the invention is designed as a one-piece pin or rod and consists of tungsten, which may have small amounts of the usual dopants, which are either advantageous for processing the tungsten into rods, or which, like in the case of, for example, thorium oxide, improve the ignitability of the high-pressure discharge lamp.
  • the electrode 11 has a shaft 11a and a head 11b.
  • the head 1 Ib is circular-cylindrical. It has a diameter of 0.35 mm. Its length is 1.2 mm.
  • the shaft 11a has a length of 6.3 mm, so that the total length of the one-piece electrode 11 measures a total of 7.5 mm.
  • the shaft Ua is welded to a molybdenum foil 103, which is used to seal the discharge vessel 10 of the high-pressure discharge lamp shown in FIG. 7.
  • the shaft 11a is flattened on two opposite sides, so that its transverse dimension perpendicular to the molybdenum foil 103 is only 0.20 mm and is therefore smaller than the diameter of the head 11b.
  • the transverse dimension of the shaft I Ia parallel to the molybdenum foil 103 is 0.35 mm, which corresponds to the diameter of the head I Ib.
  • a tungsten rod is used to produce the electrode 11, the transverse dimension of which in the region of the shaft 11a is adjusted to the desired value by mechanical material removal on two sides, preferably by milling or grinding.
  • the electrode 11 in the area of the shaft 11a has an oval or rectangular cross section.
  • the surfaces of the shaft 11a resulting from the flattening are particularly well suited for welding to the molybdenum foil 103.
  • a simplification of the manufacturing process of the electrodes according to the invention can be achieved in that the electrode in the region of the shaft is flattened only on one side instead of on two sides, as is disclosed in the second exemplary embodiment of the invention and in FIGS. 4 and 5.
  • the electrode 11 'according to the second exemplary embodiment likewise consists of tungsten and has an overall length of 7.5 mm. Its circular cylindrical head I Ib 'has a diameter of 0.35 mm and a length of 1.0 mm.
  • the shaft I Ia ' has a length of 7.5 mm and its transverse dimension perpendicular to the molybdenum foil 103 is 0.20 mm, while its transverse dimension parallel to the molybdenum foil 103 corresponds to the diameter of the head I Ib'.
  • the electrode 11 ' is also made from a circular cylindrical pin or rod with a uniform diameter of 0.35 mm.
  • the surface of the shaft 11a 'created by the flattening of the electrode 11' in the region of the shaft 11a ' is welded to the molybdenum foil 103, which is used to seal the discharge vessel 10 of the high-pressure discharge lamp shown in FIG.
  • the shaft 11a 'of the electrode 11' has an outline in cross section perpendicular to its longitudinal direction due to the flattening on one side, which is defined by a segment of a circle and a section designed as a chord, as shown schematically in FIG.
  • the electrode 1 1 " according to the third embodiment of the invention consists of a bilaterally flattened tungsten rod I Ia" and a tungsten coil I Ib ", which is threaded onto one end of the tungsten rod I Ia" and the head I Ib "of the electrode 1 1" forms.
  • the transverse dimension of the tungsten rod I Ia "perpendicular to its flattened surfaces is 0.20 mm. Its transverse dimension parallel to these surfaces is 0.35 mm.
  • the tungsten rod I Ia" has an oval or rectangular cross section perpendicular to its longitudinal extent.
  • the end of the electrode 11 "equipped with the filament 11b" after it has been installed in the discharge vessel 10 of the high-pressure discharge lamp forms the end of the electrode 11 "on the discharge side 11 "welded to the molybdenum foil 103.
  • the high-pressure discharge lamp shown in FIG. 7 and described in more detail below has two identical electrodes which correspond to one of the exemplary embodiments of the electrodes 11, 11 'or 11 "according to the invention described in more detail above.
  • the preferred embodiment of the invention is a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of approximately 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 inside diameter of the discharge space 106 is 2.6 mm and its outside diameter is 6.3 mm.
  • the two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molybdenum foil 103, 104 melted or squeezed therein.
  • the molybdenum foils 103, 104 each have a length of 6.5 mm, a width of 2 mm and a thickness of 25 ⁇ m.
  • the electrodes 11, 12 of the same type which are designed in accordance with the above-described first, second or third exemplary embodiment of the electrodes 11, 11 'or 11''and between which the lamp is used during lamp operation Forms discharge arc responsible for light emission.
  • the distance between the electrodes 11, 12 is 4.1 mm.
  • the electrodes 11, 12 are each electrically conductively connected to an electrical connection of the lamp base 15, which is essentially made of plastic, via one of the molybdenum foils 103, 104 and via the current supply line 13 remote from the base or via the current return 14 on the base side.
  • the overlap B between the electrode 11 and the molybdenum foil 103 connected to it is 1.3 mm + 0.15 mm.
  • the discharge vessel 10 is enveloped by an outer bulb 16, which is made of quartz glass or hard 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 on the base side a tubular extension 105 made of quartz glass, in which the base-side power supply 14 runs.
  • the electrodes 11, 12, the molybdenum foils 103, 104 and / or current leads 13, 14 can be coated with ruthenium in the region of the sealed ends 101, 102 of the discharge vessel 10.
  • the ionizable filling enclosed in the discharge vessel consists of xenon with a cold filling pressure of 11,800 hPa, 0.25 mg sodium iodide, 0.18 mg scandium iodide, 0.03 mg zinc iodide and 0.0024 mg indium iodide.
  • the operating voltage U of the lamp is 45 volts.

Abstract

An electrode for a discharge lamp includes an elongate shank ( 11 a) and a top ( 11 b) that is arranged on one end of the shank ( 11 a). The shaft ( 11 a) is flattened to such an extent that its dimensions at an angle to is longitudinal extension are not larger than the corresponding transversal dimensions of the top ( 11 b).

Description

Elektrode für eine Entladungslampe und EntladungslampeElectrode for a discharge lamp and discharge lamp
Die Erfindung betrifft eine Elektrode für eine Entladungslampe gemäß des Oberbegriffs des Patentanspruchs 1 und eine Entladungslampe mit derartigen Elektroden.The invention relates to an electrode for a discharge lamp according to the preamble of claim 1 and a discharge lamp with such electrodes.
I. Stand der TechnikI. State of the art
Eine derartige Elektrode und eine Entladungslampe mit einer derartigen Elektrode sind beispielsweise in der Offenlegungsschrift WO 03/060947 A2 offenbart. Diese Schrift beschreibt eine zweiteilige Elektrode mit einem zylindrischen Schaft und einem zylindrischen Kopf, wobei der Schaft und der Kopf der Elektrode unterschiedliche Durchmesser aufweisen oder / und aus unterschiedlichen Materialien bestehen. Diese Elektrode wird in einer Hochdruckentladungslampe für Fahrzeugscheinwerfer verwendet.Such an electrode and a discharge lamp with such an electrode are disclosed, for example, in the published patent application WO 03/060947 A2. This document describes a two-part electrode with a cylindrical shaft and a cylindrical head, wherein the shaft and the head of the electrode have different diameters and / or consist of different materials. This electrode is used in a high-pressure discharge lamp for vehicle headlights.
II. Darstellung der Erfindung Es ist die Aufgabe der Erfindung, eine verbesserte Elektrode für Entladungslampen bereitzustellen. Insbesondere soll die Elektrode besser mit anderen Metallteilen schweißbar sein.II. Representation of the Invention It is the object of the invention to provide an improved electrode for discharge lamps. In particular, the electrode should be easier to weld with other metal parts.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 bzw. 8 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den ab- hängigen Patentansprüchen beschrieben.This object is achieved according to the invention by the features of patent claims 1 and 8. Particularly advantageous embodiments of the invention are described in the dependent claims.
Die erfindungsgemäße Elektrode besitzt einen langgestreckten Schaft und einen Kopf, der an einem Ende des Schafts angeordnet ist, wobei erfindungsgemäß der Schaft abgeflacht ist, so dass seine Abmessungen quer zu seiner Längserstreckung höchstens so groß sind wie die entsprechenden Querabmessungen des Kopfes. Der abgeflachte Schaft ist besser mit anderen Metallteilen, insbesondere mit Molybdän- einschmelzungsfolien schweißbar, weil im Bereich der Abflachung eine größere O- berfläche für die Schweißverbindung verfügbar ist. Außerdem besitzt der Schaft aufgrund der vorgenannten Abmessungen pro Längeneinheit eine geringere Masse als das Kopfteil und damit auch eine entsprechend geringere Wärmekapazität, so dass von der erfindungsgemäßen Elektrode nur eine vergleichsweise geringe Energie- menge in Form von Wärme über den Schaft aus der Entladung abgeleitet wird.The electrode according to the invention has an elongated shaft and a head which is arranged at one end of the shaft, the shaft being flattened according to the invention, so that its dimensions transverse to its longitudinal extent are at most as large as the corresponding transverse dimensions of the head. The flattened shaft is easier to weld with other metal parts, especially with molybdenum melting foils, because there is a larger o surface for the welded connection is available. In addition, due to the aforementioned dimensions per unit length, the shaft has a lower mass than the head part and thus also a correspondingly lower heat capacity, so that only a comparatively small amount of energy in the form of heat is dissipated from the discharge via the shaft in the form of heat.
Die erfindungsgemäße Elektrode ist zwecks Vereinfachung ihrer Herstellung in vorteilhafter Weise nur einseitig oder an zwei einander gegenüberliegenden Seiten abgeflacht. Das Abflachen der Elektrode im Bereich des Schaftes wird durch spanabhebendes Abtragen von Material vorzugsweise mittels Fräsen oder Schleifen oder durch Verdampfen von Material, vorzugsweise mittels Laser durchgeführt. Diese Verfahren haben den Vorteil, dass die erfindungsgemäße Elektrode auch im Bereich von Schaft und Kopf einteilig ausgebildet werden kann und damit insbesondere keine Schweißung zwischen Schaft und Kopf erforderlich ist. Dadurch weist die erfindungsgemäße Elektrode eine im Vergleich zu einer mehrteiligen Elektrode verbes- serte mechanische Stabilität auf. Um eine hohe Steifigkeit der Elektrode zu gewährleisten, ist der Übergang vom Kopf zum Schaft der erfinduπgsgemäßen Elektrode vorteilhafter Weise möglichst moderat ausgebildet. In der Darstellung der bevorzugten Ausführungsbeispiele gemäß der Figuren 1 und 4 ist der Übergang vorzugsweise mittels eines Radius ausgeführt, dessen Wert vorzugsweise in einem Bereich von 0,3 mm bis 0,5 mm liegt.To simplify its manufacture, the electrode according to the invention is advantageously only flattened on one side or on two opposite sides. The electrode is flattened in the region of the shaft by machining material, preferably by milling or grinding, or by evaporation of material, preferably by laser. These methods have the advantage that the electrode according to the invention can also be formed in one piece in the region of the shaft and head, and therefore in particular no welding between the shaft and head is required. As a result, the electrode according to the invention has improved mechanical stability compared to a multi-part electrode. In order to ensure a high rigidity of the electrode, the transition from the head to the shaft of the electrode according to the invention is advantageously made as moderately as possible. In the illustration of the preferred exemplary embodiments according to FIGS. 1 and 4, the transition is preferably carried out by means of a radius, the value of which is preferably in a range from 0.3 mm to 0.5 mm.
Die erfindungsgemäße Elektrode wird vorzugsweise als Gasentladungselektrode für Entladungslampen, insbesondere Hochdruckentladungslampen mit einem Entladungsgefäß aus Quarzglas verwendet, das mit Molybdänfolienabdichtungen versehen ist. Die Abmessung des Schafts der erfindungsgemäßen Elektrode weist entlang einer ersten, quer zur Längsrichtung der Elektrode orientierten Raumrichtung vorzugsweise einen Wert im Bereich von 50 μm bis 350 μm auf und besitzt entlang einer zweiten Raumrichtung, die quer zur Längsrichtung der Elektrode und senkrecht zur ersten Raumrichtung orientiert ist, einen Wert im Bereich von 200 μm bis 450 μm. Derartige Elektroden sind geeignet zur Verwendung in Halogen-Metalldampf-Hochdruck- entladungslampen für Kraftfahrzeugscheinwerfer verwenden, die eine vergleichswei- se geringe Leistungsaufnahme von ca. 35 Watt besitzen. Die erfindungsgemäße E- lektrode besteht vorzugsweise aus Wolfram, einer Wolframlegierung oder aus mit Dotierstoffen versehenem Wolfram, um den hohen Temperaturen einer Gasentladung in einer Hochdruckentladungslampe standhalten zu können. Aus fertigungstechni- sehen Gründen ist die erfindungsgemäße Elektrode vorzugsweise als Stiftelektrode ausgebildet. Der Kopf der Elektrode kann mit einer Wendel versehen sein, um die Wärmekapazität des Kopfes zu erhöhen. Der gesamte Schaft oder ein Abschnitt des Schaftes der erfindungsgemäßen Elektrode kann mit Ruthenium beschichtet sein, um in dem Bereich des Entladungsgefäßes, in dem der Schaft der Elektrode in dem Ent- ladungsgefäßmaterial eng eingebettet ist, die Gefahr des Auftretens von Rissen oder Sprüngen zu reduzieren.The electrode according to the invention is preferably used as a gas discharge electrode for discharge lamps, in particular high-pressure discharge lamps with a discharge vessel made of quartz glass, which is provided with molybdenum foil seals. The dimension of the shaft of the electrode according to the invention preferably has a value in the range from 50 μm to 350 μm along a first spatial direction oriented transverse to the longitudinal direction of the electrode and has a second spatial direction oriented perpendicular to the longitudinal direction of the electrode and perpendicular to the first spatial direction is a value in the range from 200 μm to 450 μm. Such electrodes are suitable for use in metal halide high-pressure discharge lamps for motor vehicle headlights, which have a comparatively se have a low power consumption of approx. 35 watts. The electrode according to the invention preferably consists of tungsten, a tungsten alloy or tungsten provided with dopants in order to be able to withstand the high temperatures of a gas discharge in a high-pressure discharge lamp. For manufacturing reasons, the electrode according to the invention is preferably designed as a pin electrode. The head of the electrode can be provided with a helix in order to increase the heat capacity of the head. The entire shaft or a section of the shaft of the electrode according to the invention can be coated with ruthenium in order to reduce the risk of cracks or cracks occurring in the region of the discharge vessel in which the shaft of the electrode is closely embedded in the discharge vessel material.
III. Beschreibung des bevorzugten AusführungsbeispielsIII. Description of the preferred embodiment
Nachstehend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained in more detail below on the basis of a preferred exemplary embodiment. Show it:
Figur 1 Eine Seitenansicht einer Elektrode gemäß des ersten Ausführungsbeispiels der Erfindung und eine damit verschweißte Molybdänfolie in schemati- scher DarstellungFigure 1 is a side view of an electrode according to the first embodiment of the invention and a molybdenum foil welded to it in a schematic representation
Figur 2 Eine zweite Seitenansicht der in Figur 1 abgebildeten Elektrode und Mo- lybdänfolie in einer gegenüber Figur 1 um einen Winkel von 90 Grad um die Längsachse der Elektrode gedrehten AnsichtFIG. 2 A second side view of the electrode and molybdenum foil shown in FIG. 1 in a view rotated by an angle of 90 degrees around the longitudinal axis of the electrode compared to FIG. 1
Figur 3 Eine Draufsicht auf die Stirnseite des Schaftes der in Figur 1 dargestellten ElektrodeFigure 3 is a plan view of the face of the shaft of the electrode shown in Figure 1
Figur 4 Eine Seitenansicht einer Elektrode gemäß des zweiten Ausführungsbeispiels der Erfindung und eine damit verschweißte Molybdänfolie in sche- matischer DarstellungFIG. 4 shows a side view of an electrode according to the second exemplary embodiment of the invention and a molybdenum foil welded to it in a schematic representation
Figur 5 Eine zweite Seitenansicht der in Figur 4 abgebildeten Elektrode und Molybdänfolie in einer gegenüber Figur 4 um einen Winkel von 90 Grad um die Längsachse der Elektrode gedrehten Ansicht Figur 6 Eine Seitenansicht einer Elektrode gemäß eines dritten Ausfuhrungsbeispiels der Erfindung in schematischer DarstellungFIG. 5 A second side view of the electrode and molybdenum foil shown in FIG. 4 in a view rotated by an angle of 90 degrees around the longitudinal axis of the electrode compared to FIG. 4 Figure 6 is a side view of an electrode according to a third embodiment of the invention in a schematic representation
Figur 7 Eine Seitenansicht einer Hochdruckentladungslampe mit den erfindungsgemäßen ElektrodenFIG. 7 shows a side view of a high-pressure discharge lamp with the electrodes according to the invention
Die in den Figuren 1 bis 6 schematisch dargestellten Elektroden gemäß der bevorzugten Ausführungsbeispiele der Erfindung sind für den Einsatz in der in Figur 7 schematisch abgebildeten Halogen-Metalldampf-Hochdruckentladungslampe vorgesehen.The electrodes shown schematically in FIGS. 1 to 6 according to the preferred exemplary embodiments of the invention are intended for use in the high-pressure metal halide discharge lamp shown schematically in FIG.
Die Elektrode 11 gemäß des ersten Ausführungsbeispiels der Erfindung ist als eintei- liger Stift bzw. Stab ausgebildet und besteht aus Wolfram, das gegebenenfalls geringe Mengen der üblichen Dotierstoffe aufweisen kann, die entweder für die Verarbeitung des Wolframs zu Stäben vorteilhaft sind, oder die, wie im Fall von beispielsweise Thoriumoxid, die Zündwilligkeit der Hochdruckentladungslampe verbessern. Die Elektrode 1 1 weist einen Schaft 1 Ia und einen Kopf I I b auf. Der Kopf 1 Ib ist kreis- zylindrisch ausgebildet. Er besitzt einen Durchmesser von 0,35 mm. Seine Länge beträgt 1 ,2 mm. Der Schaft 1 Ia besitzt eine Länge von 6,3 mm, so dass die Gesamtlänge der einteiligen Elektrode 11 insgesamt 7,5 mm misst. Der Schaft Ua ist mit einer Molybdänfolie 103 verschweißt, die zur Abdichtung des Entladungsgefäßes 10 der in Figur 7 abgebildeten Hochdruckentladungslampe dient. Der Schaft I Ia ist an zwei einander gegenüberliegenden Seiten abgeflacht ausgebildet, so dass seine Querabmessung senkrecht zur Molybdänfolie 103 nur 0,20 mm beträgt und damit geringer als der Durchmesser des Kopfes I Ib ist. Die Querabmessung des Schafts I Ia parallel zur Molybdänfolie 103 beträgt 0,35 mm stimmt damit mit dem Durchmesser des Kopfes I Ib überein. Zur Herstellung der Elektrode 1 1 wird ein Wolframstab verwendet, dessen Querabmessung im Bereich des Schafts I Ia durch zweiseitigen mechanischen Materialabtrag, vorzugsweise mittels Fräsen oder Schleifen, auf den gewünschten Wert eingestellt wird. Dadurch besitzt die Elektrode 1 1 im Bereich des Schafts I Ia einen ovalen oder rechteckigen Querschnitt. Die durch das Abflachen entstandenen Oberflächen des Schaftes I Ia eignen sich besonders gut zum Ver- schweißen mit der Molybdänfolie 103. Eine Vereinfachung des Herstellungsprozesses der erfindungsgemäßen Elektroden kann dadurch erreicht werden, dass die Elektrode im Bereich des Schafts statt zweiseitig nur einseitig abgeflacht wird, wie bei dem zweiten Ausführungsbeispiel der Erfindung und in den Figuren 4 und 5 offenbart ist. Die Elektrode 11 ' gemäß des zweiten Ausführungsbeispiels besteht ebenfalls aus Wolfram und besitzt eine Gesamtlänge von 7,5 mm. Ihr kreiszylindrischer Kopf I Ib' besitzt einen Durchmesser von 0,35 mm und eine Länge von 1,0 mm. Der Schaft I Ia' besitzt eine Länge von 7,5 mm und seine Querabmessung senkrecht zu der Molybdänfolie 103 beträgt 0,20 mm, während seine Querabmessung parallel zur Molybdänfolie 103 mit dem Durchmesser des Kopfes I Ib' übereinstimmt. Die Elektrode 11' ist, wie beim ersten Ausführungsbeispiel, ebenfalls aus einem kreiszylindrischen Stift bzw. Stab mit einem einheitlichen Durchmesser von 0,35 mm gefertigt. Die durch das Abflachen der Elektrode 11 ' im Bereich des Schaftes I Ia' entstandene Oberfläche des Schaftes I Ia' ist mit der Molybdänfolie 103 verschweißt, die zur Abdichtung des Entladungs- gefäßes 10 der in Figur 7 abgebildeten Hochdruckentladungslampe dient. Der Schaft 1 Ia' der Elektrode 11' besitzt im Querschnitt senkrecht zu ihrer Längsrichtung aufgrund des einseitigen Abflachens einen Umriss, der durch ein Kreissegment und eine als Kreissehne ausgebildete Strecke definiert ist, wie in Figur 5 schematisch dargestellt ist.The electrode 11 according to the first exemplary embodiment of the invention is designed as a one-piece pin or rod and consists of tungsten, which may have small amounts of the usual dopants, which are either advantageous for processing the tungsten into rods, or which, like in the case of, for example, thorium oxide, improve the ignitability of the high-pressure discharge lamp. The electrode 11 has a shaft 11a and a head 11b. The head 1 Ib is circular-cylindrical. It has a diameter of 0.35 mm. Its length is 1.2 mm. The shaft 11a has a length of 6.3 mm, so that the total length of the one-piece electrode 11 measures a total of 7.5 mm. The shaft Ua is welded to a molybdenum foil 103, which is used to seal the discharge vessel 10 of the high-pressure discharge lamp shown in FIG. 7. The shaft 11a is flattened on two opposite sides, so that its transverse dimension perpendicular to the molybdenum foil 103 is only 0.20 mm and is therefore smaller than the diameter of the head 11b. The transverse dimension of the shaft I Ia parallel to the molybdenum foil 103 is 0.35 mm, which corresponds to the diameter of the head I Ib. A tungsten rod is used to produce the electrode 11, the transverse dimension of which in the region of the shaft 11a is adjusted to the desired value by mechanical material removal on two sides, preferably by milling or grinding. As a result, the electrode 11 in the area of the shaft 11a has an oval or rectangular cross section. The surfaces of the shaft 11a resulting from the flattening are particularly well suited for welding to the molybdenum foil 103. A simplification of the manufacturing process of the electrodes according to the invention can be achieved in that the electrode in the region of the shaft is flattened only on one side instead of on two sides, as is disclosed in the second exemplary embodiment of the invention and in FIGS. 4 and 5. The electrode 11 'according to the second exemplary embodiment likewise consists of tungsten and has an overall length of 7.5 mm. Its circular cylindrical head I Ib 'has a diameter of 0.35 mm and a length of 1.0 mm. The shaft I Ia 'has a length of 7.5 mm and its transverse dimension perpendicular to the molybdenum foil 103 is 0.20 mm, while its transverse dimension parallel to the molybdenum foil 103 corresponds to the diameter of the head I Ib'. As in the first exemplary embodiment, the electrode 11 'is also made from a circular cylindrical pin or rod with a uniform diameter of 0.35 mm. The surface of the shaft 11a 'created by the flattening of the electrode 11' in the region of the shaft 11a 'is welded to the molybdenum foil 103, which is used to seal the discharge vessel 10 of the high-pressure discharge lamp shown in FIG. The shaft 11a 'of the electrode 11' has an outline in cross section perpendicular to its longitudinal direction due to the flattening on one side, which is defined by a segment of a circle and a section designed as a chord, as shown schematically in FIG.
Die Elektrode 1 1 " gemäß des dritten Alisführungsbeispiels der Erfindung .besteht aus einem zweiseitig abgeflachten Wolframstab I Ia" und einer Wolframwendel I Ib", die auf ein Ende des Wolframstabs I Ia" aufgefädelt ist und den Kopf I Ib" der Elektrode 1 1 " bildet. Die Querabmessung des Wolframstabs I Ia" senkrecht zu seinen durch das Abflachen entstandenen Oberflächen beträgt 0.20 mm. Seine Quer- abmessung parallel zu diesen Oberflächen beträgt 0,35 mm. Der Wolframstab I Ia" besitzt senkrecht zu seiner Längserstreckung einen ovalen oder rechteckigen Querschnitt. Das mit der Wendel I Ib" ausgestattete Ende der Elektrode 11 " bildet nach ihrer Montage im Entladungsgefäß 10 der Hochdruckentladungslampe das entla- dungsseitige Ende der Elektrode 11 ". Eine der durch das Abflachen entstandenen Oberflächen des Wolframstabs I Ia" ist nach der Montage der Elektrode 11 " mit der Molybdänfolie 103 verschweißt. Die in Figur 7 abgebildete und unten näher beschriebene Hochdruckentladungslampe besitzt zwei identische Elektroden, die einem der oben näher beschriebenen Ausfüh- rungsbeispiele der erfindungsgemäßen Elektroden 11, 11' oder 11" entsprechen.The electrode 1 1 "according to the third embodiment of the invention consists of a bilaterally flattened tungsten rod I Ia" and a tungsten coil I Ib ", which is threaded onto one end of the tungsten rod I Ia" and the head I Ib "of the electrode 1 1" forms. The transverse dimension of the tungsten rod I Ia "perpendicular to its flattened surfaces is 0.20 mm. Its transverse dimension parallel to these surfaces is 0.35 mm. The tungsten rod I Ia" has an oval or rectangular cross section perpendicular to its longitudinal extent. The end of the electrode 11 "equipped with the filament 11b" after it has been installed in the discharge vessel 10 of the high-pressure discharge lamp forms the end of the electrode 11 "on the discharge side 11 "welded to the molybdenum foil 103. The high-pressure discharge lamp shown in FIG. 7 and described in more detail below has two identical electrodes which correspond to one of the exemplary embodiments of the electrodes 11, 11 'or 11 "according to the invention described in more detail above.
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 gleichartige Elektroden 1 1, 12, die entsprechend des oben erläuterten ersten, zweiten oder dritten Ausführungsbeispiels der Elektroden 1 1 , 1 1 ' oder 1 1 " ausgebildet sind und zwischen denen sich während des Lampenbetriebes der für die Lichtemission verantwortliche Entladungsbogen ausbildet.The preferred embodiment of the invention is a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of approximately 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 inside diameter of the discharge space 106 is 2.6 mm and its outside diameter is 6.3 mm. The two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molybdenum foil 103, 104 melted or squeezed therein. The molybdenum foils 103, 104 each have a length of 6.5 mm, a width of 2 mm and a thickness of 25 μm. In the interior of the discharge vessel 10 there are two electrodes 11, 12 of the same type, which are designed in accordance with the above-described first, second or third exemplary embodiment of the electrodes 11, 11 'or 11''and between which the lamp is used during lamp operation Forms discharge arc responsible for light emission.
Der Abstand zwischen den Elektroden 11, 12 beträgt 4,1 mm. Die Elektroden 1 1, 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 Lam- pensockels 15 verbunden. Der Überlapp B zwischen der Elektrode 11 und der mit ihr verbundenen Molybdänfolie 103 beträgt 1,3 mm + 0,15 mm. 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 sockel- seitig 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 distance between the electrodes 11, 12 is 4.1 mm. The electrodes 11, 12 are each electrically conductively connected to an electrical connection of the lamp base 15, which is essentially made of plastic, via one of the molybdenum foils 103, 104 and via the current supply line 13 remote from the base or via the current return 14 on the base side. The overlap B between the electrode 11 and the molybdenum foil 103 connected to it is 1.3 mm + 0.15 mm. The discharge vessel 10 is enveloped by an outer bulb 16, which is made of quartz glass or hard 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 on the base side a tubular extension 105 made of quartz glass, in which the base-side power supply 14 runs. The electrodes 11, 12, the molybdenum foils 103, 104 and / or current leads 13, 14 can 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 Scandium- jodid, 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 enclosed in the discharge vessel consists of xenon with a cold filling pressure of 11,800 hPa, 0.25 mg sodium iodide, 0.18 mg scandium iodide, 0.03 mg zinc iodide and 0.0024 mg indium iodide. The operating voltage U of the lamp is 45 volts. Their color temperature is 4000 Kelvin, their color location 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

Patentansprüche claims
1. Elektrode für eine Entladungslampe mit einem langgestreckten Schaft (I Ia) und einem Kopf (1 Ib), der an einem Ende des Schafts (1 Ia) angeordnet ist, dadurch gekennzeichnet, dass der Schaft (I Ia) abgeflacht ist, so dass seine Abmessungen quer zu seiner Längserstreckung höchstens so groß sind wie die entsprechenden Querabmessungen des Kopfes (I Ia).1. Electrode for a discharge lamp with an elongated shaft (I Ia) and a head (1 Ib), which is arranged at one end of the shaft (1 Ia), characterized in that the shaft (I Ia) is flattened so that its dimensions transverse to its longitudinal extent are at most as large as the corresponding transverse dimensions of the head (I Ia).
2. Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass die Elektrode (11) zumindest im Bereich von Schaft (I Ia) und Kopf (I Ib) einteilig ausgebildet ist.2. Electrode according to claim 1, characterized in that the electrode (11) is formed in one piece at least in the region of the shaft (I Ia) and head (I Ib).
3. Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass der Schaft (Ha') einseitig abgeflacht ist.3. Electrode according to claim 1, characterized in that the shaft (Ha ') is flattened on one side.
4. Elektrode nach Anspruch 1, dadurch gekennzeichnet, dass der Schaft (I Ia) an zwei einander gegenüberliegenden Seiten abgeflacht ist.4. Electrode according to claim 1, characterized in that the shaft (I Ia) is flattened on two opposite sides.
5. Elektrode nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Abmessung des Schafts (1 Ia) entlang einer ersten, quer zur Längsrichtung der Elektrode (1 1) orientierten Raumrichtung einen Wert im5. Electrode according to one or more of claims 1 to 4, characterized in that the dimension of the shaft (1 Ia) along a first spatial direction oriented transversely to the longitudinal direction of the electrode (1 1) has a value in
Bereich von 50 Mikrometer bis 350 Mikrometer besitzt und entlang einer zweiten Raumrichtung, die quer zur Längsrichtung der Elektrode (11) und senkrecht zur ersten Raumrichtung orientiert ist, einen Wert im Bereich von 200 Mikrometer bis 450 Mikrometer besitzt.Has a range of 50 microns to 350 microns and along a second spatial direction, which is oriented transversely to the longitudinal direction of the electrode (11) and perpendicular to the first spatial direction, has a value in the range of 200 microns to 450 microns.
6. Elektrode nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Elektrode (11) aus Wolfram, einer Wolframlegierung oder aus mit Dotierstoffen versehenem Wolfram besteht.6. Electrode according to one or more of the preceding claims, characterized in that the electrode (11) consists of tungsten, a tungsten alloy or tungsten provided with dopants.
7. Elektrode nach Anspruch 6, dadurch gekennzeichnet, dass ein Abschnitt des Schafts mit einer Beschichtung versehen ist, die Ruthenium enthält. 7. Electrode according to claim 6, characterized in that a section of the shaft is provided with a coating which contains ruthenium.
8. Entladungslampe mit mindestens einer Elektrode nach einem oder mehreren der Ansprüche 1 bis 7.8. Discharge lamp with at least one electrode according to one or more of claims 1 to 7.
9. Entladungslampe nach Anspruch 8, dadurch gekennzeichnet, dass das Entladungsgefäß (10) aus Quarzglas besteht und mindestens eine Molybdänfolienabdichtung aufweist, wobei der Schaft (I Ia) der mindestens einen Elektrode (11) mit einer Molybdänfolie (103) der mindestens einen Molybdänfolienabdichtung verbunden ist. 9. Discharge lamp according to claim 8, characterized in that the discharge vessel (10) consists of quartz glass and has at least one molybdenum foil seal, the shaft (I Ia) of the at least one electrode (11) being connected to a molybdenum foil (103) of the at least one molybdenum foil seal is.
EP05752440A 2004-06-15 2005-05-19 Electrode for a discharge lamp and discharge lamp Not-in-force EP1756853B1 (en)

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DE102004028562A DE102004028562A1 (en) 2004-06-15 2004-06-15 Electrode for a discharge lamp and discharge lamp
PCT/DE2005/000921 WO2005124822A1 (en) 2004-06-15 2005-05-19 Electrode for a discharge lamp and discharge lamp

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DE102005038350A1 (en) * 2005-08-11 2007-02-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH High pressure discharge lamp
DE102007061514A1 (en) * 2007-12-20 2009-06-25 Osram Gesellschaft mit beschränkter Haftung Electrode for a high-pressure discharge lamp and method for its production

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Publication number Priority date Publication date Assignee Title
JPS5524233B2 (en) * 1972-07-01 1980-06-27
DE3444922A1 (en) * 1984-12-08 1986-06-12 Philips Patentverwaltung Gmbh, 2000 Hamburg HIGH PRESSURE GAS DISCHARGE LAMP WITH AN ELECTRODE CONSTRUCTED FROM TUNGSTEN SHEET
DE3716485C1 (en) * 1987-05-16 1988-11-24 Heraeus Gmbh W C Xenon short-arc discharge lamp
DE3904552A1 (en) * 1989-02-15 1990-08-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh HIGH PRESSURE DISCHARGE LAMP FOR AC POWER OPERATION
JPH0574420A (en) * 1991-03-31 1993-03-26 Toshiba Lighting & Technol Corp Metal vapor discharge lamp
JP3298466B2 (en) * 1997-07-17 2002-07-02 ウシオ電機株式会社 Short arc type discharge lamp and method of manufacturing the same
DE10291427B4 (en) * 2001-03-30 2009-07-09 Matsushita Electric Industrial Co. Ltd. Metal halide lamp for a motor vehicle headlight
JP3613239B2 (en) * 2001-12-04 2005-01-26 ウシオ電機株式会社 Short arc type ultra high pressure discharge lamp

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Title
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ATE435501T1 (en) 2009-07-15
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DE102004028562A1 (en) 2006-01-05
DE502005007626D1 (en) 2009-08-13

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