EP0086479B1 - High-pressure discharge lamp - Google Patents

High-pressure discharge lamp Download PDF

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Publication number
EP0086479B1
EP0086479B1 EP83101392A EP83101392A EP0086479B1 EP 0086479 B1 EP0086479 B1 EP 0086479B1 EP 83101392 A EP83101392 A EP 83101392A EP 83101392 A EP83101392 A EP 83101392A EP 0086479 B1 EP0086479 B1 EP 0086479B1
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EP
European Patent Office
Prior art keywords
support element
lamp
discharge space
pressure discharge
length
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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.)
Expired
Application number
EP83101392A
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German (de)
French (fr)
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EP0086479A2 (en
EP0086479A3 (en
Inventor
Walter Triebel
Heinz Bunke
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Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0086479A3 publication Critical patent/EP0086479A3/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

Definitions

  • the invention relates to a high-pressure discharge lamp with a lamp bulb made of quartz and enclosing the electrodes made of tungsten and a noble gas, to the rotationally symmetrical discharge space of which a cylindrical bulb shaft adjoins in the longitudinal axis on the two opposite sides and each bulb shaft at its end together with one arranged on the lamp axis Electrode rod, which is provided with the electrode projecting into the discharge space, is sealed in a gastight manner by melting, a support element surrounding the electrode rod being arranged with play within the bulb shaft and a compression spring being provided to fix the position thereof in the direction of the lamp longitudinal axis.
  • the object of the present invention is to arrange the support element in such a way and to secure it against axial displacement in such a way that neither complicated adjustment processes nor deformation work has to be carried out on the discharge vessel.
  • the compression spring is arranged non-positively between the electrode and the support element, as a result of which this rests resiliently on part of the melt with the end face facing away from the compression spring.
  • the length of the support element is preferably dimensioned such that its end face facing the discharge space essentially seals it off from the piston skirt.
  • the guiding properties of the support element within the piston skirt are also significantly improved in that the length thereof is advantageously greater or at least as large as its diameter.
  • the ratio of the length of the support element to the diameter is constant, while in the case of larger power levels the end of the support element facing the discharge space has a larger diameter - for example in the form of a stepped and rounded section - than the end facing away from the discharge space.
  • the support element consists of a material with a high melting point and a coefficient of expansion similar to that of the discharge vessel. For this, e.g. Quartz or ceramic are particularly suitable. According to the invention, a metal with a high melting point, e.g. Tungsten.
  • the design has the advantage that no heat treatments of any kind are required to deform the discharge vessel, neither in prefabrication nor in the fully assembled and melted lamp, which, because of the specific properties of the material, can only be carried out by highly qualified specialists. Since the support element rests on part of the melt, only the electrode spacing in the discharge space needs to be taken into account when mounting and melting the lamp feet into the discharge vessel. The length of the support element is selected such that almost the entire cavity in the piston skirt is not accessible for the discharge. This results in the further advantages that tilting of the support elements and thus mechanical damage to the inner surface of the piston skirt during assembly are excluded and the volume to be filled with noble gas is significantly reduced. In addition, these masses located behind the electrodes form cold spots at which vaporized tungsten from the electrodes can condense without adversely affecting the amount of light emitted.
  • the high pressure discharge lamp 1 shown in Figure 1 surrounds, with its approximately spherical excluding l i accordingen discharge space 2, the retained by means of the electrode rods 3, 4, disposed on the longitudinal lamp axis and protruding into the discharge space 2 anode 5 and cathode 6 are Starting from opposite sides of the discharge space the electrode rods 3, 4 concentrically surrounding cylindrical piston shafts 7, 8 arranged, the ends of which gas are tightly fused to the electrode rods 3, 4.
  • the gas-tight seal consists of the glazing 9 or 10, the dome 11 (only visible on the cathode side) and the ends of the piston shafts 7, 8.
  • a support element in each is surrounded on the electrode rods 3, 4 and by the piston shafts 9, 10 with play Form a capillary tube 12, 13 made of quartz, which is pressed by means of a pressure spring 14, 15 made of tungsten between the anode 5 or the cathode 6 and the capillary tube 12, 13 to the associated glazing 9, 10.
  • the capillary tubes 12 and 13 have a length L of 25 mm and 20 mm and a diameter D of approximately 7.5 mm.
  • the high-pressure discharge lamp 1 is closed by a pump tip 16 located on the bulb shaft 7.
  • the electrode rod 4 located outside of the melting point is connected via a connecting piece 17 to an external power supply 18 which is designed as a strand. Both lamp ends are provided with a base sleeve 19 or 20.
  • An ignition wire 21 is guided outside the discharge space 2 and wraps around the respective bulb shafts 7 and 8.
  • a typical high-pressure discharge lamp has a xenon filling pressure of approximately 10 bar and is operated on direct voltage with an electrical power of 500 W.
  • a lamp base (see also FIG. 2) for a high-pressure discharge lamp 1 is produced in a simple manner.
  • the electrode rod 4 made of tungsten is first provided with a glazing 10.
  • the glazing 10 has a smaller coefficient of expansion compared to the tungsten.
  • the dome 11 to be applied subsequently consists of one or more transition glasses, each with a far lower expansion coefficient.
  • the last material to be applied, like the bead 22, is quartz glass.
  • the end of the piston skirt 8 is later melted onto the bead 22.
  • the capillary tube 24 made of quartz and having a rounded shoulder 23 in the exemplary embodiment in FIG. 2 is pushed onto the electrode rod 4.
  • the capillary tube 24 here has a length L of approximately 20 mm and a largest diameter D of approximately 10 mm.
  • the ratio of the length L to the diameter D is 2.0 on the side facing the discharge space and is thus smaller than on the side facing away from the discharge space.
  • the capillary tube 24 is easily displaceable on the electrode rod 4.
  • the compression spring 15 made of tungsten is also pushed onto the electrode rod 4, likewise easily displaceable.
  • the cathode 6 is fastened to the free-standing end of the electrode rod 4, the compression spring 15 being under slight tension and the capillary tube 24 being pressed permanently against the glazing 10.
  • the foot thus finished is pushed into the cylindrical piston shaft 8 and, after appropriate positioning in the discharge space 2, is fused in a conventional manner.
  • the second lamp side is produced in a similar manner, only the distance between the electrodes 5 and 6 having to be adjusted when this lamp foot is melted into the bulb shaft 7.
  • the protruding tube piece 25 made of quartz is removed before further processing to the finished lamp.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Description

Die Erfindung betrifft eine Hochdruckentladungslampe mit einem die Elektroden aus Wolfram und ein Edelgas umschliessenden Lampenkolben aus Quarz, an dessen rotationssymmetrischen Entladungsraum sich in der Längsachse an den zwei gegenüberliegenden Seiten je ein zylindrischer Kolbenschaft anschliesst und jeder Kolbenschaft an seinem Ende zusammen mit einem auf der Lampenlängsachse angeordneten Elektrodenstab, der mit der in den Entladungsraum ragenden Elektrode versehen ist, durch eine Einschmelzung gasdicht verschlossen ist, wobei ein den Elektrodenstab umgebendes Stützelement mit Spiel innerhalb des Kolbenschaftes angeordnet und zur Lagefixierung desselben in Richtung der Lampenlängsachse eine Druckfeder vorgesehen ist.The invention relates to a high-pressure discharge lamp with a lamp bulb made of quartz and enclosing the electrodes made of tungsten and a noble gas, to the rotationally symmetrical discharge space of which a cylindrical bulb shaft adjoins in the longitudinal axis on the two opposite sides and each bulb shaft at its end together with one arranged on the lamp axis Electrode rod, which is provided with the electrode projecting into the discharge space, is sealed in a gastight manner by melting, a support element surrounding the electrode rod being arranged with play within the bulb shaft and a compression spring being provided to fix the position thereof in the direction of the lamp longitudinal axis.

Auf Grund des relativ grossen Gewichtes der Elektroden bei den mit Gleichstrom betriebenen Lampen hat sich die Notwendigkeit von Stützelementen im Kolbenschaft gezeigt. Dabei sind verschiedene Lösungsmöglichkeiten bekannt geworden:

  • In der DE-C-1 132242 wird vorgeschlagen, als Stützelement eine im eingeschnürten Kolbenschaft mit Schlitzen und/oder Löchern versehene zylindrische Rolle aus Quarz anzuordnen, die mit ihrer Mantelfläche mit der Innenwand des Kolbenschaftes verschmolzen ist. Die DE-A-2623099 beschreibt ein nicht mit dem Kolbenschaft verschmolzenes Stützelement, wobei zusätzlich mehrere verschiedene und gleichzeitig angewandte Mittel zur Lagefixierung desselben in Richtung der Lampenlängsachse vorgesehen sind, die jedoch einerseits eine sehr genaue Justierung und andererseits eine Erwärmung des Kolbenschaftes der fertig eingeschmolzenen Lampe auf Erweichungstemperatur erfordern. In der DE-A-3029824 wurden diese Nachteile dadurch behoben, indem ein Stützelement mit seiner verrundeten Kante mittels einer Druckfeder gegen eine zuvor angebrachte Verengung zwischen dem Kolbenschaft und dem Entladungsgefäss gedrückt wird.
Due to the relatively large weight of the electrodes in the lamps operated with direct current, the need for support elements in the bulb stem has been shown. Various possible solutions have become known:
  • In DE-C-1 132242 it is proposed to arrange a cylindrical roller made of quartz in the constricted piston skirt with slits and / or holes, which is fused with its outer surface to the inner wall of the piston skirt. DE-A-2623099 describes a support element not fused to the bulb shaft, several additional and simultaneously used means for fixing the same in the direction of the lamp longitudinal axis being provided, which, however, on the one hand allow very precise adjustment and on the other hand heat the bulb shaft of the melted-down lamp to softening temperature. In DE-A-3029824, these disadvantages have been eliminated in that a support element with its rounded edge is pressed by means of a compression spring against a previously applied constriction between the bulb shaft and the discharge vessel.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das Stützelement derart anzuordnen und gegen axiale Verschiebung zu sichern, dass weder komplizierte Justiervorgänge noch Verformarbeiten am Entladungsgefäss vorgenommen werden müssen.The object of the present invention is to arrange the support element in such a way and to secure it against axial displacement in such a way that neither complicated adjustment processes nor deformation work has to be carried out on the discharge vessel.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass bei einer Hochdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen die Druckfeder kraftschlüssig zwischen der Elektrode und dem Stützelement angeordnet ist, wodurch dieses mit der der Druckfeder abgewandten Stirnfläche federnd an einem Teil der Einschmelzung anliegt. Dabei ist die Länge des Stützelementes vorzugsweise derart bemessen, dass seine dem Entladungsraum zugewandte Stirnfläche diesen gegenüber dem Kolbenschaft im wesentlichen abschliesst. Die Führungseigenschaften des Stützelementes innerhalb des Kolbenschaftes werden ausserdem wesentlich verbessert, indem dessen Länge vorteilhaft grösser oder mindestens genauso gross wie dessen Durchmesser ist. Bei kleinen Lampen mit niedrigeren Leistungsstufen ist das Verhältnis der Länge des Stützelementes zum Durchmesser konstant, während bei grösseren Leistungsstufen das dem Entladungsraum zugewandte Ende des Stützelementes einen grösseren Durchmesser - zum Beispiel in Form eines abgesetzten und verrundeten Teilstückes - aufweist als das dem Entladungsraum abgewandte Ende. Das Stützelement besteht aus einem Material mit hohem Schmelzpunkt und einem Ausdehnungskoeffizient ähnlich dem des Entladungsgefässes. Hierfür ist z.B. Quarz oder Keramik besonders geeignet. Für die Druckfeder wird erfindungsgemäss ein Metall mit hohem Schmelzpunkt, wie z.B. Wolfram, verwendet.This object is achieved according to the invention in that, in the case of a high-pressure discharge lamp with the features mentioned in the preamble of the main claim, the compression spring is arranged non-positively between the electrode and the support element, as a result of which this rests resiliently on part of the melt with the end face facing away from the compression spring. The length of the support element is preferably dimensioned such that its end face facing the discharge space essentially seals it off from the piston skirt. The guiding properties of the support element within the piston skirt are also significantly improved in that the length thereof is advantageously greater or at least as large as its diameter. In the case of small lamps with lower power levels, the ratio of the length of the support element to the diameter is constant, while in the case of larger power levels the end of the support element facing the discharge space has a larger diameter - for example in the form of a stepped and rounded section - than the end facing away from the discharge space. The support element consists of a material with a high melting point and a coefficient of expansion similar to that of the discharge vessel. For this, e.g. Quartz or ceramic are particularly suitable. According to the invention, a metal with a high melting point, e.g. Tungsten.

Die Konstruktion hat den Vorteil, dass weder bei der Vorfertigung noch bei der fertig montierten und eingeschmolzenen Lampe Wärmebehandlungen irgendwelcher Art zur Verformung des Entladungsgefässes erforderlich sind, was wegen der spezifischen Eigenschaften des Materials nur von hochqualifizierten Fachkräften durchgeführt werden kann. Da das Stützelement an einem Teil der Einschmelzung anliegt, braucht beim Montieren und Einschmelzen der Lampenfüsse in das Entladungsgefäss nur auf den Elektrodenabstand im Entladungsraum geachtet zu werden. Die Länge des Stützelementes ist derart gewählt, dass nahezu der gesamte Hohlraum im Kolbenschaft für die Entladung nicht zugänglich ist. Dadurch ergeben sich die weiteren Vorteile, dass ein Verkanten der Stützelemente und damit eine mechanische Beschädigung der Innenoberfläche des Kolbenschaftes bei der Montage ausgeschlossen und das mit Edelgas zu füllende Volumen wesentlich verkleinert wird. Darüber hinaus bilden diese hinter den Elektroden gelegenen Massen kalte Stellen, an denen verdampftes Wolfram der Elektroden ohne negativen Einfluss auf die abgegebene Lichtmenge kondensieren kann.The design has the advantage that no heat treatments of any kind are required to deform the discharge vessel, neither in prefabrication nor in the fully assembled and melted lamp, which, because of the specific properties of the material, can only be carried out by highly qualified specialists. Since the support element rests on part of the melt, only the electrode spacing in the discharge space needs to be taken into account when mounting and melting the lamp feet into the discharge vessel. The length of the support element is selected such that almost the entire cavity in the piston skirt is not accessible for the discharge. This results in the further advantages that tilting of the support elements and thus mechanical damage to the inner surface of the piston skirt during assembly are excluded and the volume to be filled with noble gas is significantly reduced. In addition, these masses located behind the electrodes form cold spots at which vaporized tungsten from the electrodes can condense without adversely affecting the amount of light emitted.

Bevorzugte Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Figuren beschrieben:

  • Figur 1 zeigt schematisiert eine fertige Hochdruckentladungslampe im Teilschnitt.
  • Figur 2 zeigt schematisiert einen montierten Fuss einer Hochdruckentladungslampe im Teilschnitt.
Preferred exemplary embodiments of the invention are described below with reference to the figures:
  • Figure 1 shows schematically a finished high-pressure discharge lamp in partial section.
  • Figure 2 shows schematically an assembled base of a high-pressure discharge lamp in partial section.

Die in der Figur 1 dargestellte Hochdruckentladungslampe 1 umschliesst mit ihrem etwa kugelförmig ausglibildeten Entladungsraum 2 die mittels der Elektrodenstäbe 3, 4 gehalterten, auf der Lampenlängsachse angeordneten und in den Entladungsraum 2 ragende Anode 5 und Kathode 6. Von gegenüberliegenden Seiten des Entladungsraumes ausgehend sind die die Elektrodenstäbe 3, 4 konzentrisch umgebenden, zylindrischen Kolbenschäfte 7, 8 angeordnet, deren Enden gasdicht mit den Elektrodenstäben 3, 4 verschmolzen sind. Die gasdichte Einschmelzung besteht aus der Anglasung 9 bzw. 10, dem Dom 11 (nur kathodenseitig sichtbar) sowie den Enden der Kolbenschäfte 7, 8. Auf den Elektrodenstäben 3,4 und von den Kolbenschäften 9, 10 mit Spiel umgeben ist jeweils ein Stützelement in Form eines Kapillarrohres 12, 13 aus Quarz angeordnet, wobei dieses mittels einer zwischen der Anode 5 bzw. der Kathode 6 und dem Kapillarrohr 12, 13 befindlichen Druckfeder 14, 15 aus Wolfram an die zugehörige Anglasung 9, 10 gedrückt wird. Die Kapillarrohre 12 bzw. 13 weisen eine Länge L von 25 mm bzw. 20 mm und einen Durchmesser D von ca. 7,5 mm auf. Das Verhältnis der Länge L zum Durchmesser D ist im vorliegenden Ausführungsbeispiel über die gesamte Länge konstant und beträgt für das anodenseitige Kapillarrohr 12 = 3,33 und für das kathodenseitige Kapillarrohr 13 = 2,67. Die Hochdruckentladungslampe 1 ist mit einer am Kolbenschaft 7 befindlichen Pumpspitze 16 verschlossen. Der ausserhalb der Einschmelzung befindliche Elektrodenstab 4 ist über ein Verbindungsstück 17 mit einer äusseren, als Litze ausgeführten Stromzuführung 18 verbunden. Beide Lampenenden sind mit einer Sockelhülse 19 bzw. 20 versehen. Ein Zünddraht 21 ist ausserhalb des Entladungsraums 2 entlanggeführt und umschlingt die jeweiligen Kolbenschäfte 7 und 8. Eine typische Hochdruckentladungslampe weist einen Xenonfülldruck von ca. 10 bar auf und wird an Gleichspannung mit einer elektrischen Leistung von 500 W betrieben.The high pressure discharge lamp 1 shown in Figure 1 surrounds, with its approximately spherical excluding l ibildeten discharge space 2, the retained by means of the electrode rods 3, 4, disposed on the longitudinal lamp axis and protruding into the discharge space 2 anode 5 and cathode 6 are Starting from opposite sides of the discharge space the electrode rods 3, 4 concentrically surrounding cylindrical piston shafts 7, 8 arranged, the ends of which gas are tightly fused to the electrode rods 3, 4. The gas-tight seal consists of the glazing 9 or 10, the dome 11 (only visible on the cathode side) and the ends of the piston shafts 7, 8. A support element in each is surrounded on the electrode rods 3, 4 and by the piston shafts 9, 10 with play Form a capillary tube 12, 13 made of quartz, which is pressed by means of a pressure spring 14, 15 made of tungsten between the anode 5 or the cathode 6 and the capillary tube 12, 13 to the associated glazing 9, 10. The capillary tubes 12 and 13 have a length L of 25 mm and 20 mm and a diameter D of approximately 7.5 mm. The ratio of the length L to the diameter D is constant over the entire length in the present exemplary embodiment and is 12 = 3.33 for the anode-side capillary tube and 13 = 2.67 for the cathode-side capillary tube. The high-pressure discharge lamp 1 is closed by a pump tip 16 located on the bulb shaft 7. The electrode rod 4 located outside of the melting point is connected via a connecting piece 17 to an external power supply 18 which is designed as a strand. Both lamp ends are provided with a base sleeve 19 or 20. An ignition wire 21 is guided outside the discharge space 2 and wraps around the respective bulb shafts 7 and 8. A typical high-pressure discharge lamp has a xenon filling pressure of approximately 10 bar and is operated on direct voltage with an electrical power of 500 W.

Die Herstellung eines Lampenfusses (siehe auch Figur 2) für eine Hochdruckentladungslampe 1 erfolgt auf einfache Weise. Der Elektrodenstab 4 aus Wolfram wird zuerst mit einer Anglasung 10 versehen. Die Anglasung 10 weist einen gegenüber dem Wolfram abgestuften, kleineren Ausdehnungskoeffizient auf. Je nach Grösse und Leistungsaufnahme der Lampe besteht der nachfolgend aufzutragende Dom 11 aus einem oder mehreren Übergangsgläsern mit jeweils weit niedriger gelegenem Ausdehnungskoeffizient. Das letzte aufzubringende Material ist- ebenfalls wie der Wulst 22 - Quarzglas. An den Wulst 22 wird später das Ende des Kolbenschaftes 8 angeschmolzen. Auf den Elektrodenstab 4 wird nach Fertigstellung des Doms 11 das in dem Ausführungsbeispiel der Figur 2 einen verrrundeten Absatz 23 aufweisende Kapillarrohr 24 aus Quarz geschoben. Das Kapillarrohr 24 weist hier eine Länge L von ca. 20 mm und einen grössten Durchmesser D von ca. 10 mm auf. Das Verhältnis der Länge L zum Durchmesser D beträgt an der dem Entladungsraum zugewandten Seite 2,0 und ist somit kleiner als an der dem Entladungsraum abgewandten Seite. Das Kapillarrohr 24 ist auf dem Elektrodenstab 4 leicht verschiebbar. Im Anschluss daran wird - ebenfalls leicht verschiebbar - die Druckfeder 15 aus Wolfram auf den Elektrodenstab 4 geschoben. Zuletzt wird die Kathode 6 am freistehenden Ende des Elektrodenstabes 4 befestigt, wobei die Druckfeder 15 unter leichter Spannung steht und das Kapillarrohr 24 permanent gegen die Anglasung 10 gedrückt wird. Der so fertiggestellte Fuss wird in den zylindrischen Kolbenschaft 8 geschoben und nach entsprechender Positionierung im Entladungsraum 2 auf konventionelle Weise verschmolzen. Die zweite Lampenseite wird auf ähnliche Art hergestellt, wobei beim Einschmelzen dieses Lampenfusses in den Kolbenschaft 7 lediglich der Abstand der Elektroden 5 und 6 justiert werden muss. Vor der Weiterverarbeitung bis zur fertigen Lampe wird das überstehende Rohrstück 25 aus Quarz entfernt.A lamp base (see also FIG. 2) for a high-pressure discharge lamp 1 is produced in a simple manner. The electrode rod 4 made of tungsten is first provided with a glazing 10. The glazing 10 has a smaller coefficient of expansion compared to the tungsten. Depending on the size and power consumption of the lamp, the dome 11 to be applied subsequently consists of one or more transition glasses, each with a far lower expansion coefficient. The last material to be applied, like the bead 22, is quartz glass. The end of the piston skirt 8 is later melted onto the bead 22. After completion of the dome 11, the capillary tube 24 made of quartz and having a rounded shoulder 23 in the exemplary embodiment in FIG. 2 is pushed onto the electrode rod 4. The capillary tube 24 here has a length L of approximately 20 mm and a largest diameter D of approximately 10 mm. The ratio of the length L to the diameter D is 2.0 on the side facing the discharge space and is thus smaller than on the side facing away from the discharge space. The capillary tube 24 is easily displaceable on the electrode rod 4. Subsequently, the compression spring 15 made of tungsten is also pushed onto the electrode rod 4, likewise easily displaceable. Finally, the cathode 6 is fastened to the free-standing end of the electrode rod 4, the compression spring 15 being under slight tension and the capillary tube 24 being pressed permanently against the glazing 10. The foot thus finished is pushed into the cylindrical piston shaft 8 and, after appropriate positioning in the discharge space 2, is fused in a conventional manner. The second lamp side is produced in a similar manner, only the distance between the electrodes 5 and 6 having to be adjusted when this lamp foot is melted into the bulb shaft 7. The protruding tube piece 25 made of quartz is removed before further processing to the finished lamp.

Claims (5)

1. A high-pressure discharge lamp (1) with a lamp envelope of quartz that includes the electrodes (5, 6) of tungsten and a rare gas and at whose rotation symmetrical discharge space (2) there extend in the longitudinal axis cylindrical envelope shafts (7, 8) at the two opposite sides thereof, each envelope shaft (7, 8) being hermetically sealed by a seal (8, 10, 11) at its end including an electrode rod (3, 4) disposed on the longitudinal lamp axis, the electrode rod being provided with an electrode (5, 6) projecting into the discharge space, with a support element (12, 13) surrounding the electrode rod (3, 4) in spaced relation with the envelope shaft (7, 8) and with a compression spring (14, 15) being provided to fix the support element in position in the direction of the longitudinal lamp axis, characterized in that the compression spring (14, 15) is disposed in force-locking engagement between the electrode (5, 6) and the support element (12, 13) whereby the front of the support element facing away from the compression spring (14, 15) abuts a portion of the seal (9, 10).
2. A high-pressure discharge lamp as claimed in claim 1, characterized in that the length L of the support element (12, 13) is so dimensioned that its front facing the discharge space (2) substantially closes the discharge space off from the envelope shaft (7, 8).
3. A high-pressure discharge lamp as claimed in claims 1 and 2, characterized in that the ratio of the length L of the support element (12,13) to the diameter D is constant over the entire length.
4. A high-pressure discharge lamp as claimed in claims 1 and 2, characterized in that the ratio of the length L of the support element (12,13) to the diameter D is smaller at the side facing the discharge space than at the side facing away from the discharge space.
5. A high-pressure discharge lamp as claimed in claims 1 to 4, characterized in that the ratio of the length L of the support element (12,13) to the diameter D is equal to or larger than one.
EP83101392A 1982-02-16 1983-02-14 High-pressure discharge lamp Expired EP0086479B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823205401 DE3205401A1 (en) 1982-02-16 1982-02-16 HIGH PRESSURE DISCHARGE LAMP
DE3205401 1982-02-16

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EP0086479A2 EP0086479A2 (en) 1983-08-24
EP0086479A3 EP0086479A3 (en) 1983-11-30
EP0086479B1 true EP0086479B1 (en) 1986-08-06

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US (1) US4559472A (en)
EP (1) EP0086479B1 (en)
JP (1) JPS58152369A (en)
DE (2) DE3205401A1 (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR900008794B1 (en) * 1986-06-11 1990-11-29 티 디 케이 가부시끼가이샤 Discharge lamp unit
GB2199693B (en) * 1986-12-02 1990-08-15 Noblelight Ltd Improvements in and relating to flash lamps
US4868458A (en) * 1988-02-18 1989-09-19 General Electric Company Xenon lamp particularly suited for automotive applications
DE3923589A1 (en) * 1989-07-17 1991-01-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh HIGH PRESSURE DISCHARGE LAMP
JPH0612606Y2 (en) * 1989-12-29 1994-03-30 ミヨタ株式会社 Halogen lamp
JPH0531801Y2 (en) * 1990-01-29 1993-08-16
DE4030820A1 (en) * 1990-09-28 1992-04-02 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh HIGH PRESSURE DISCHARGE LAMP
US5369329A (en) * 1992-10-09 1994-11-29 Canrad, Inc. Short arc lamp electrode rod supports
US5598063A (en) * 1992-12-16 1997-01-28 General Electric Company Means for supporting and sealing the lead structure of a lamp
US5898270A (en) * 1997-04-11 1999-04-27 Ilc Technology, Inc. Monocoque structure and large electrode beaded rob re-entrant seals for flashlamp-pumped solid-state laser flashlamps
US5859492A (en) * 1997-07-11 1999-01-12 Austad; Helge Electrode rod support for short arc lamp
JP3562271B2 (en) * 1997-11-07 2004-09-08 ウシオ電機株式会社 Short arc lamp
US6078132A (en) * 1998-01-21 2000-06-20 Imaging & Sensing Technology Corporation Miniature deuterium arc lamp
DE69926445T2 (en) * 1998-05-12 2006-03-30 Ushiodenki K.K. High-pressure discharge lamp
JP3718077B2 (en) * 1999-03-16 2005-11-16 松下電器産業株式会社 Metal halide lamp
WO2002003418A1 (en) * 2000-06-30 2002-01-10 Applied Materials, Inc. Lamp for a rapid thermal processing chamber
JP3669292B2 (en) * 2001-06-14 2005-07-06 ウシオ電機株式会社 Short arc type discharge lamp
JP4311319B2 (en) * 2004-09-22 2009-08-12 ウシオ電機株式会社 Short arc type discharge lamp
DE102006026485A1 (en) * 2006-06-07 2007-12-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Socket for a lamp
DE102021206702A1 (en) * 2021-06-28 2022-12-29 Ushio Germany Gmbh HIGH PRESSURE DISCHARGE LAMP, PARTICULARLY HIGH PRESSURE SODIUM VAPOR LAMP, WITH IMPROVED IGNITION ABILITY

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132242B (en) * 1961-01-16 1962-06-28 Patra Patent Treuhand Melting electrodes for high pressure discharge lamps and processes for their manufacture
US3970883A (en) * 1975-04-07 1976-07-20 Varian Associates Arc lamp with movable electrode
NL7506655A (en) * 1975-06-05 1976-12-07 Philips Nv SHORT-ARC DISCHARGE LAMP.
DE3029824A1 (en) * 1980-08-06 1982-03-11 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München HIGH PRESSURE DISCHARGE LAMP

Also Published As

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DE3365048D1 (en) 1986-09-11
JPS58152369A (en) 1983-09-09
JPH0421984B2 (en) 1992-04-14
DE3205401A1 (en) 1983-08-25
US4559472A (en) 1985-12-17
EP0086479A2 (en) 1983-08-24
EP0086479A3 (en) 1983-11-30

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