EP0759633B1 - High pressure discharge lamp - Google Patents

High pressure discharge lamp Download PDF

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Publication number
EP0759633B1
EP0759633B1 EP96111638A EP96111638A EP0759633B1 EP 0759633 B1 EP0759633 B1 EP 0759633B1 EP 96111638 A EP96111638 A EP 96111638A EP 96111638 A EP96111638 A EP 96111638A EP 0759633 B1 EP0759633 B1 EP 0759633B1
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EP
European Patent Office
Prior art keywords
sintered body
discharge lamp
pressure discharge
oxide
lamp 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.)
Expired - Lifetime
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EP96111638A
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German (de)
French (fr)
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EP0759633A1 (en
Inventor
Albert Rademacher
Ulrich Rösner
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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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
    • 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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of claim 1.
  • Such a high-pressure discharge lamp is, for example, in Japanese Patent application JP 55-155457 disclosed.
  • This patent application describes a high-pressure discharge lamp with electrodes that one in the Discharge space protruding metal rod and a containing lanthanum oxide have cylindrical sintered body and an electrode coil.
  • the sintered body is arranged at the free end of the metal rod and from surrounding the electrode coil.
  • the electrode coil also encloses this end of the metallic electrode rod facing the sintered body.
  • the Sintered body is designed as an electron emitter. It contains no radioactive Thorium oxide, but consists of lanthanum oxide, yttrium oxide and tungsten, where lanthanum oxide and yttrium oxide together make up a proportion by weight of 0.2-60% on the sintered body.
  • the ratio of lanthanum oxide to yttrium oxide is 0.5-50 mole percent.
  • the disadvantage is that this electron emitter insufficient thermal over the life of the lamp Has stability.
  • a high-pressure discharge lamp is also in the published patent application EP 0 647 964 disclosed with a non-radioactive electron emitter.
  • This Electron emitter consists of a first metal oxide with a comparatively high electron work function, from the group hafnium oxide and zirconium oxide is selected, and with a second metal oxide comparatively low electron work function, that from the group yttrium oxide, Lanthanum oxide, cerium oxide and scandium oxide is selected.
  • This Electron emitter has a relatively large number of components, is over the life of the lamp not sufficiently thermally stable and is in the discharge not color neutral.
  • Japanese laid-open patent publication JP-A-63257177 describes a high-pressure discharge lamp with a lamp electrode, the tip of which Tungsten containing lanthanum oxide. Because the lanthanum oxide is less Has electron work function as tungsten, the Ignition voltage of the high-pressure discharge lamp reduced.
  • the American patent US 4,319,158 discloses an electrode for a high-pressure discharge lamp with an electron emitter, which contains both lanthanum oxide and yttrium oxide. Of the Emitter contains 0.5 to 80 mole percent lanthanum oxide and 99.5 to 20 mole percent Yttrium oxide.
  • a high-pressure discharge lamp with a to provide improved electron emitter in particular a has sufficient thermal stability over the life of the lamp and a good ignitability of the lamp with as little blackening of the lamp as possible Discharge vessel guaranteed.
  • the high-pressure discharge lamp according to the invention has electrodes that are equipped with a sintered body acting as an electron emitter.
  • the sintered body is surrounded by an electrode coil and contains according to the invention at least 90 percent by weight lanthanum oxide. This gives the sintered body has a high lifetime thermal stability and causes no significant blackening of the Discharge vessel.
  • the lamp with this electron emitter a good ignitability.
  • the sintered body consists exclusively of Lanthanum oxide. This sintered body has a very high thermal stability and causes practically no blackening of the discharge vessel over the total lamp life.
  • Embodiment contains the sintered body in addition to Lanthanum oxide yet another electron emitter consisting of the two Components barium oxide and tungsten oxide, which are made from a eutectic Mixture of barium carbonate and tungsten oxide has emerged.
  • This further electron emitter to Lanthanum oxide still ignites the high-pressure discharge lamp improved and the blackening behavior compared to the first embodiment deteriorated only marginally.
  • the end of the electron coil on the discharge side advantageously protrudes beyond the sintered body and has a narrowed inner diameter, which is smaller than the diameter of the sintered body while the other end of the electrode coil is the one adjacent to the sintered body Encloses the electrode rod end. This measure will on the one hand improves the fixation of the sintered body on the electrode rod and on the other hand, the blackening of the discharge vessel by sputtering Emitter material further reduced.
  • the discharge vessel 1 is essentially cylindrical and consists of Quartz glass and has two gas-tight ends la, 1b, in each an electrode system is melted in a known manner.
  • the Electrodes each have a power supply 2, which is melted via a molybdenum foil 3 with one made of a high-melting metal, such as molybdenum or tungsten, existing electrode rod 4 is connected.
  • the electrode rods 4 end in the discharge space and are aligned axially in the discharge vessel 1. At the discharge end the electrode rod 4 is wrapped by an electrode coil 6 Sintered body 5 attached. Details of the lamp electrodes are in the schematic Figure 2 shown.
  • the electrode coil 6 has two layers executed.
  • the diameter of the electrode rod 4 is for a high-pressure metal halide discharge lamp with an electrical power consumption of approx. 2000 W, corresponding to the one to be described here two embodiments, approximately 1.0 mm.
  • the diameter of the sintered body 5 is only slightly smaller.
  • the electrode coil 6 is on the end of the electrode rod 4 pushed on the discharge side. Encloses them the sintered body 5 and the end of the electrode rod 4 on the discharge side tight and also projects beyond the discharge end of the sintered body 5 out.
  • the inside diameter of the electrode coil 6 is on the discharge side End narrowed to about 0.7 mm and thus smaller than that Diameter of the electrode rod 4 and the sintered body 5.
  • the diameter of the spiral wire is approximately 0.8 mm.
  • the sintered body 5 consists exclusively of lanthanum oxide. He has a mass of approx. 10 mg.
  • the second embodiment differs only in the composition of the sintered body 5 from the first embodiment.
  • the sintered body 5 consists of 95.1 percent by weight Lanthanum oxide and 4.9 percent by weight of another electron emitter, which in turn consists of barium oxide and tungsten oxide.
  • the total weight of the sintered body is approximately 10 mg.
  • To manufacture the Sintered body 5 is a eutectic mixture of barium carbonate and Tungsten oxide, i.e. 22.04 percent by weight barium carbonate with 77.96 percent by weight Tungsten oxide, which is then produced with the addition of HO binder with which lanthanum oxide is mixed.
  • This batch is pressed into bars, cut and sintered in a hydrogen atmosphere. During the Sintering process, the binder is heated and the barium carbonate in barium oxide converted.
  • the invention is not limited to the exemplary embodiments described in more detail above.
  • the sintered body according to the invention can also be used in others Types of high pressure discharge lamps can be used. To have to only the dimensions and the mass of the sintered body accordingly be adjusted.

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 claim 1.

Eine derartige Hochdruckentladungslampe ist beispielsweise in der japanischen Patentanmeldung JP 55-155457 offenbart. Diese Patentanmeldung beschreibt eine Hochdruckentladungslampe mit Elektroden, die einen in den Entladungsraum hineinragenden Metallstab und einen Lanthanoxid enthaltenden zylindrischen Sinterkörper sowie eine Elektrodenwendel aufweisen. Der Sinterkörper ist am freien Ende des Metallstabes angeordnet und von der Elektrodenwendel umgeben. Die Elektrodenwendel umschließt auch das dem Sinterkörper zugewandte Ende des metallischen Elektrodenstabes. Der Sinterkörper ist als Elektronenemitter ausgebildet. Er enthält kein radioaktives Thoriumoxid, sondern besteht aus Lanthanoxid, Yttriumoxid und Wolfram, wobei Lanthanoxid und Yttriumoxid zusammen einen Gewichtsanteil von 0,2-60% am Sinterkörper haben. Das Verhältnis von Lanthanoxid zu Yttriumoxid beträgt dabei 0,5-50 Molprozent. Nachteilig ist, daß dieser Elektronenemitter über die Lampenlebensdauer keine ausreichende thermische Stabilität besitzt.Such a high-pressure discharge lamp is, for example, in Japanese Patent application JP 55-155457 disclosed. This patent application describes a high-pressure discharge lamp with electrodes that one in the Discharge space protruding metal rod and a containing lanthanum oxide have cylindrical sintered body and an electrode coil. The sintered body is arranged at the free end of the metal rod and from surrounding the electrode coil. The electrode coil also encloses this end of the metallic electrode rod facing the sintered body. Of the Sintered body is designed as an electron emitter. It contains no radioactive Thorium oxide, but consists of lanthanum oxide, yttrium oxide and tungsten, where lanthanum oxide and yttrium oxide together make up a proportion by weight of 0.2-60% on the sintered body. The ratio of lanthanum oxide to yttrium oxide is 0.5-50 mole percent. The disadvantage is that this electron emitter insufficient thermal over the life of the lamp Has stability.

Auch in der Offenlegungsschrift EP 0 647 964 ist eine Hochdruckentladungslampe mit einem nicht-radioaktiven Elektronenemitter offenbart. Dieser Elektronenemitter besteht aus einem ersten Metalloxid mit einer vergleichsweise hohen Elektronenaustrittsarbeit, das aus der Gruppe Hafniumoxid und Zirkonoxid ausgewählt wird, und aus einem zweiten Metalloxid mit vergleichsweise niedriger Elektronenaustrittsarbeit, das aus der Gruppe Yttriumoxid, Lanthanoxid, Ceroxid und Scandiumoxid ausgewählt wird. Dieser Elektronenemitter besitzt relativ viele Komponenten, ist über die Lampenlebensdauer nicht hinreichend thermisch stabil und ist in der Entladung nicht farbneutral. A high-pressure discharge lamp is also in the published patent application EP 0 647 964 disclosed with a non-radioactive electron emitter. This Electron emitter consists of a first metal oxide with a comparatively high electron work function, from the group hafnium oxide and zirconium oxide is selected, and with a second metal oxide comparatively low electron work function, that from the group yttrium oxide, Lanthanum oxide, cerium oxide and scandium oxide is selected. This Electron emitter has a relatively large number of components, is over the life of the lamp not sufficiently thermally stable and is in the discharge not color neutral.

Die japanische Offenlegungsschrift JP-A-63257177 beschreibt eine Hochdrukkentladungslampe mit einer Lampenelektrode, deren Spitze aus Lanthanoxid enthaltendem Wolfram besteht. Da das Lanthanoxid eine geringere Elektronen-Austrittsarbeit als Wolfram besitzt, wird dadurch die Zündspannung der Hochdruckentladungslampe verringert.Japanese laid-open patent publication JP-A-63257177 describes a high-pressure discharge lamp with a lamp electrode, the tip of which Tungsten containing lanthanum oxide. Because the lanthanum oxide is less Has electron work function as tungsten, the Ignition voltage of the high-pressure discharge lamp reduced.

Die amerikanische Patentschrift US 4,319,158 offenbart eine Elektrode für eine Hochdruckentladungslampe mit einem Eleketronenemitter, der sowohl Lanthanoxid als auch Yttriumoxid aufweist. Der Emitter enhält 0,5 bis 80 Molprozent Lanthanoxid und 99,5 bis 20 Molprozent Yttriumoxid. The American patent US 4,319,158 discloses an electrode for a high-pressure discharge lamp with an electron emitter, which contains both lanthanum oxide and yttrium oxide. Of the Emitter contains 0.5 to 80 mole percent lanthanum oxide and 99.5 to 20 mole percent Yttrium oxide.

Es ist die Aufgabe der Erfindung eine Hochdruckentladungslampe mit einem verbesserten Elektronenemitter bereitzustellen, der insbesondere eine über die Lampenlebensdauer ausreichende thermische Stabilität besitzt und eine gute Zündwilligkeit der Lampe bei möglichst geringer Schwärzung des Entladungsgefäßes gewährleistet.It is the object of the invention a high-pressure discharge lamp with a to provide improved electron emitter, in particular a has sufficient thermal stability over the life of the lamp and a good ignitability of the lamp with as little blackening of the lamp as possible Discharge vessel guaranteed.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the characterizing features of claim 1 solved. Particularly advantageous versions of the Invention are described in the subclaims.

Die erfindungsgemäße Hochdruckentladungslampe besitzt Elektroden, die mit einem als Elektronenemitter wirkenden Sinterkörper ausgestattet sind. Der Sinterkörper ist von einer Elektrodenwendel umgeben und enthält erfindungsgemäß mindestens 90 Gewichtsprozent Lanthanoxid. Dadurch erhält der Sinterkörper eine über die gesamte Lebensdauer der Lampe hohe thermische Stabilität und verursacht keine nennenswerte Schwärzung des Entladungsgefäßes. Außerdem weist die Lampe mit diesem Elektronenemitter eine gute Zündwilligkeit auf. Gemäß eines besonders bevorzugten ersten Ausführungsbeispiels besteht der Sinterkörper ausschließlich aus Lanthanoxid. Dieser Sinterkörper besitzt eine sehr hohe thermische Stabilität und verursacht praktisch keine Schwärzung des Entladungsgefäßes über die gesamte Lampenlebensdauer. Es hat sich gezeigt, daß die Zugabe weiterer Substanzen mit geringer Elektronenaustrittsarbeit wie beispielsweise Yttriumoxid nicht unbedingt erforderlich ist, um eine zufriedenstellende Zündwilligkeit der Lampe zu erzielen. Gemäß eines zweiten besonders bevorzugten Ausführungsbeispiels enthält der Sinterkörper zusätzlich zum Lanthanoxid noch einen weiteren Elektronenemitter bestehend aus den beiden Komponenten Bariumoxid und Wolframoxid, der aus einem eutektischen Gemisch von Bariumkarbonat und Wolframoxid hervorgegangen ist. Durch den geringen Zusatz dieses weiteren Elektronenemitter zum Lanthanoxid wird die Zündwilligkeit der Hochdruckentladungslampe noch verbessert und das Schwärzungsverhalten im Vergleich zum ersten Ausführungsbeispiel nur unwesentlich verschlechtert. Außerdem hat es sich als vorteilhaft erwiesen, eine zweilagig gewickelte Elektrodenwendel, die den Sinterkörper umgibt, zu verwenden. Dadurch wird der Elektronen emittierende Sinterkörper während der Zündphase auf eine vergleichsweise höhere Temperatur aufgeheizt und somit die thermische Elektronenemission verbessert. Das entladungsseitige Ende der Elektronenwendel ragt vorteilhafterweise über den Sinterkörper hinaus und besitzt einen verengten Innendurchmesser, der kleiner als der Durchmesser des Sinterkörpers ist, während das andere Ende der Elektrodenwendel das an den Sinterkörper angrenzende Elektrodenstabende umschließt. Durch diese Maßnahme wird einerseits die Fixierung des Sinterkörpers am Elektrodenstab verbessert und andererseits die Schwärzung des Entladungsgefäßes durch absputterndes Emittermaterial weiter verringert.The high-pressure discharge lamp according to the invention has electrodes that are equipped with a sintered body acting as an electron emitter. The sintered body is surrounded by an electrode coil and contains according to the invention at least 90 percent by weight lanthanum oxide. This gives the sintered body has a high lifetime thermal stability and causes no significant blackening of the Discharge vessel. In addition, the lamp with this electron emitter a good ignitability. According to a particularly preferred In the first embodiment, the sintered body consists exclusively of Lanthanum oxide. This sintered body has a very high thermal stability and causes practically no blackening of the discharge vessel over the total lamp life. It has been shown that the addition of further Substances with low electron work functions such as yttrium oxide is not essential to a satisfactory To achieve ignitability of the lamp. According to a second particularly preferred Embodiment contains the sintered body in addition to Lanthanum oxide yet another electron emitter consisting of the two Components barium oxide and tungsten oxide, which are made from a eutectic Mixture of barium carbonate and tungsten oxide has emerged. The slight addition of this further electron emitter to Lanthanum oxide still ignites the high-pressure discharge lamp improved and the blackening behavior compared to the first embodiment deteriorated only marginally. It also turned out to be proved to be advantageous, a two-layer wound electrode coil, the Sintered body surrounds to use. This makes the electron emitting Sintered body during the ignition phase to a comparatively higher one Temperature warmed up and thus the thermal electron emission improved. The end of the electron coil on the discharge side advantageously protrudes beyond the sintered body and has a narrowed inner diameter, which is smaller than the diameter of the sintered body while the other end of the electrode coil is the one adjacent to the sintered body Encloses the electrode rod end. This measure will on the one hand improves the fixation of the sintered body on the electrode rod and on the other hand, the blackening of the discharge vessel by sputtering Emitter material further reduced.

Nachstehend wird die Erfindung anhand zweier bevorzugter Ausführungsbeispiele näher erläutert. Es zeigen:

Figur 1
einen Querschnitt durch das Entladungsgefäßes einer erfindungsgemäßen Hochdruckentladungslampe in schematischer Darstellung
Figur 2
eine schematische Darstellung des Aufbaus einer erfindungsgemäßen Lampenelektrode, teilweise geschnitten
The invention is explained in more detail below with the aid of two preferred exemplary embodiments. Show it:
Figure 1
a cross section through the discharge vessel of a high-pressure discharge lamp according to the invention in a schematic representation
Figure 2
a schematic representation of the structure of a lamp electrode according to the invention, partially cut

Die Figur 1 zeigt den Aufbau des Entladungsgefäßes der Hochdruckentladungslampen gemäß der beiden näher zu beschreibenden Ausführungsbeispiele. Das Entladungsgefäß 1 ist im wesentlich zylindrisch, besteht aus Quarzglas und besitzt zwei gasdicht verschlossene Enden la, 1b, in die jeweils auf bekannte Weise ein Elektrodensystem eingeschmolzen ist. Die Elektroden weisen jeweils eine Stromzuführung 2 auf, die über eine Molybdänfolieneinschmelzung 3 mit einem aus einem hochschmelzenden Metall, wie beispielsweise Molybdän oder Wolfram, bestehenden Elektrodenstab 4 verbunden ist. Die Elektrodenstäbe 4 enden im Entladungsraum und sind axial im Entladunsggefäß 1 ausgerichtet. Am entladungsseitigen Ende der Elektrodenstäbe 4 ist ein von einer Elektrodenwendel 6 umwickelter Sinterkörper 5 befestigt. Einzelheiten der Lampenelektroden sind in der schematischen Figur 2 abgebildet. Die Elektrodenwendel 6 ist zweilagig ausgeführt. Der Durchmesser des Elektrodenstabes 4 beträgt für eine Halogenmetalldampf-Hochdruckentladungslampe mit einer elektrischen Leistungsaufnahme von ca. 2000 W, entsprechend der hier zu beschreibenden beiden Ausführungsbeispiele, ungefähr 1,0 mm. Der Durchmesser des Sinterkörpers 5 ist nur geringfügig kleiner. Die Elektrodenwendel 6 ist auf das entladungsseitige Ende des Elektrodenstabes 4 aufgeschoben. Sie umschließt den Sinterkörper 5 und das entladungsseitige Ende des Elektrodenstabes 4 eng und ragt außerdem über das entladungsseitige Ende des Sinterkörpers 5 hinaus. Dabei ist der Innendurchmesser der Elektrodenwendel 6 am entladungsseitigen Ende auf ca. 0,7 mm verengt und damit kleiner als der Durchmesser des Elektrodenstabes 4 und des Sinterkörpers 5. Der Durchmesser des Wendeldrahtes beträgt ungefähr 0,8 mm. Beim ersten Ausführungsbeispiel besteht der Sinterkörper 5 ausschließlich aus Lanthanoxid. Er hat eine Masse von ca. 10 mg.1 shows the structure of the discharge vessel of the high-pressure discharge lamps according to the two exemplary embodiments to be described in more detail. The discharge vessel 1 is essentially cylindrical and consists of Quartz glass and has two gas-tight ends la, 1b, in each an electrode system is melted in a known manner. The Electrodes each have a power supply 2, which is melted via a molybdenum foil 3 with one made of a high-melting metal, such as molybdenum or tungsten, existing electrode rod 4 is connected. The electrode rods 4 end in the discharge space and are aligned axially in the discharge vessel 1. At the discharge end the electrode rod 4 is wrapped by an electrode coil 6 Sintered body 5 attached. Details of the lamp electrodes are in the schematic Figure 2 shown. The electrode coil 6 has two layers executed. The diameter of the electrode rod 4 is for a high-pressure metal halide discharge lamp with an electrical power consumption of approx. 2000 W, corresponding to the one to be described here two embodiments, approximately 1.0 mm. The diameter of the sintered body 5 is only slightly smaller. The electrode coil 6 is on the end of the electrode rod 4 pushed on the discharge side. Encloses them the sintered body 5 and the end of the electrode rod 4 on the discharge side tight and also projects beyond the discharge end of the sintered body 5 out. The inside diameter of the electrode coil 6 is on the discharge side End narrowed to about 0.7 mm and thus smaller than that Diameter of the electrode rod 4 and the sintered body 5. The diameter of the spiral wire is approximately 0.8 mm. In the first embodiment the sintered body 5 consists exclusively of lanthanum oxide. He has a mass of approx. 10 mg.

Das zweite Ausführungsbeispiel unterscheidet sich nur durch die Zusammensetzung des Sinterkörpers 5 vom ersten Ausführungsbeispiel. Gemäß des zweiten Ausführungsbeispiel besteht der Sinterkörper 5 aus 95,1 Gewichtsprozent Lanthanoxid und 4,9 Gewichtsprozent eines weiteren Elektronenemitters, der seinerseits aus Bariumoxid und Wolframoxid besteht. Das Gesamtgewicht des Sinterkörpers beträgt ca. 10 mg. Zur Fertigung des Sinterkörpers 5 wird ein eutektisches Gemisch aus Bariumkarbonat und Wolframoxid, d.h. 22,04 Gewichtsprozent Bariumkarbonat mit 77,96 Gewichtsprozent Wolframoxid, hergestellt, das anschließend unter Zugabe von HO-Binder mit dem Lanthanoxid vermengt wird. Der Gewichtsanteil des Lanthanoxids im Gemenge beträgt, ohne Berücksichtigung des HO-Binders, ca. 94,8 Gewichtsprozent und der Anteil des eutektischen Gemisches beträgt dann ungefähr 5,2 Gewichtsprozent. Dieses Gemenge wird zu Stangen gepreßt, zugeschnitten und in Wasserstoff-Atmosphäre gesintert. Während des Sinterprozesses wird der Binder ausgeheizt und das Bariumkarbonat in Bariumoxid umgewandelt.The second embodiment differs only in the composition of the sintered body 5 from the first embodiment. According to In the second embodiment, the sintered body 5 consists of 95.1 percent by weight Lanthanum oxide and 4.9 percent by weight of another electron emitter, which in turn consists of barium oxide and tungsten oxide. The total weight of the sintered body is approximately 10 mg. To manufacture the Sintered body 5 is a eutectic mixture of barium carbonate and Tungsten oxide, i.e. 22.04 percent by weight barium carbonate with 77.96 percent by weight Tungsten oxide, which is then produced with the addition of HO binder with which lanthanum oxide is mixed. The weight fraction of the Lanthanum oxide in the batch, without taking the HO binder into account, 94.8 percent by weight and the proportion of the eutectic mixture then about 5.2 percent by weight. This batch is pressed into bars, cut and sintered in a hydrogen atmosphere. During the Sintering process, the binder is heated and the barium carbonate in barium oxide converted.

Die Erfindung beschränkt sich nicht auf die oben näher beschriebenen Ausführungsbeispiele. Der erfindungsgemäße Sinterkörper kann auch bei anderen Typen von Hochdruckentladungslampen verwendet werden. Es müssen lediglich die Abmessungen und die Masse des Sinterkörpers entsprechend angepaßt werden.The invention is not limited to the exemplary embodiments described in more detail above. The sintered body according to the invention can also be used in others Types of high pressure discharge lamps can be used. To have to only the dimensions and the mass of the sintered body accordingly be adjusted.

Claims (7)

  1. High-pressure discharge lamp having a transparent discharge vessel (1) which is sealed in a gastight fashion and in which an ionizable filling is enclosed, and electrodes (4) which are sealed in the discharge vessel (1), extend into the discharge space, and are connected to supply leads (2), the electrodes (4) having a sintered body (5) containing lanthanum oxide, and an electrode filament (6) which surrounds the sintered body (5), characterized in that the sintered body (5) contains at least 90 per cent by weight of lanthanum oxide.
  2. High-pressure discharge lamp according to Claim 1, characterized in that the sintered body (5) consists of lanthanum oxide.
  3. High-pressure discharge lamp according to Claim 1, characterized in that the sintered body (5) contains barium oxide and tungsten oxide.
  4. High-pressure discharge lamp according to Claim 1, characterized in that the sintered body (5) consists of lanthanum oxide, barium oxide and tungsten oxide.
  5. High-pressure discharge lamp according to Claim 1, characterized in that the electrode filament (6) is designed in two layers.
  6. High-pressure discharge lamp according to Claim 1, characterized in that the discharge-side end of the electrode filament (6) projects beyond the sintered body (5) and has a reduced inside diameter, the inside diameter being smaller at the reduced filament end than the thickness or the diameter of the sintered body (5).
  7. High-pressure discharge lamp according to Claim 1, characterized in that the electrode filament (6) is pushed onto one end of the respective electrode rod (4).
EP96111638A 1995-08-17 1996-07-18 High pressure discharge lamp Expired - Lifetime EP0759633B1 (en)

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Application Number Priority Date Filing Date Title
DE19530293A DE19530293A1 (en) 1995-08-17 1995-08-17 High pressure discharge lamp
DE19530293 1995-08-17

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EP0759633A1 EP0759633A1 (en) 1997-02-26
EP0759633B1 true EP0759633B1 (en) 1999-09-22

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US (1) US5712531A (en)
EP (1) EP0759633B1 (en)
JP (1) JPH0963535A (en)
CA (1) CA2183481A1 (en)
DE (2) DE19530293A1 (en)
HU (1) HU215045B (en)

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DE19530293A1 (en) 1997-02-20
HUP9602280A1 (en) 1997-11-28
DE59603137D1 (en) 1999-10-28
HU215045B (en) 1998-09-28
JPH0963535A (en) 1997-03-07
EP0759633A1 (en) 1997-02-26
CA2183481A1 (en) 1997-02-18
US5712531A (en) 1998-01-27
HU9602280D0 (en) 1996-10-28

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