EP0034113B1 - Electric discharge lamp - Google Patents

Electric discharge lamp Download PDF

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Publication number
EP0034113B1
EP0034113B1 EP81730009A EP81730009A EP0034113B1 EP 0034113 B1 EP0034113 B1 EP 0034113B1 EP 81730009 A EP81730009 A EP 81730009A EP 81730009 A EP81730009 A EP 81730009A EP 0034113 B1 EP0034113 B1 EP 0034113B1
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EP
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Prior art keywords
ceramic
wires
discharge lamp
electric discharge
filaments
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EP81730009A
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German (de)
French (fr)
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EP0034113A1 (en
Inventor
Béla Dr. Dipl.Ing. Kerekes
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Egyesuelt Izzolampa es Villamossagi Rt
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Egyesuelt Izzolampa es Villamossagi Rt
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors

Definitions

  • the invention relates to an electric discharge lamp with an elongate discharge vessel made of ceramic and electrodes arranged at both ends in the discharge vessel according to the preamble of patent claim 1.
  • Discharge lamps of this type are known from US Pat. Nos. 3,992,642 and 3,882,346, respectively.
  • the power supply to the electrodes consists of a niobium wire, which is passed through the respective ceramic plate, in a vacuum-tight manner.
  • Discharge lamps are also known in practice, in which the power supply consists of niobium tubes which are welded to niobium sealing caps which encompass the ends of the discharge vessel. In all of these cases, the conductor cross-section was determined by the specified line - i.e. H. of the current to be enforced - determined.
  • the sealing caps were made of the same metal as the power supply leads, the heating of the power supply leads did not pose any problems because the coefficients of thermal expansion were the same.
  • ceramic plates were used instead of the metal caps for the vacuum-tight sealing of the discharge vessel, the thermal stresses occurring due to the different coefficients of thermal expansion led to dilatation effects and ultimately to cracks in the area where the current conductors passed through the ceramic plates. With the formation of the power supply in the form of tubes - which have their own elasticity - the problems could not be reduced but not eliminated.
  • the invention is therefore based on the object of designing the electric discharge lamp of the type mentioned at the outset in such a way that, even with necessarily larger power line cross sections, no harmful thermal stresses occur between the power supply and the discharge vessel or the ceramic plates sealing the discharge vessel.
  • FIG. 1 shows a discharge lamp designed according to the invention as an example, which contains a ceramic discharge tube 3 in a glass bulb 4 provided with lamp base 7, filled or evacuated with inert gas, the two ends of which are closed by end elements 8 made of ceramic.
  • end elements 8 made of ceramic.
  • electrodes 11 at both ends, to which the current supply line is provided by current leads 9 consisting of filaments 10, expediently of niobium wires, which are individually vacuum-tightly passed through the terminating members 8 and are braided or twisted outside the discharge tube.
  • FIG. 2 one end of an electric discharge lamp with a ceramic discharge tube 3 according to the invention is shown in detail as an exemplary embodiment.
  • the end tube 3 terminating ceramic 8 are made of four elementary threads 10 made of niobium wire current leads 9, the two threads are connected to the electrode 11 in the discharge space, both electrically and thermally conductive on its U-shaped bent part.
  • the four elementary threads 10 protruding from the discharge space are twisted together and form a rigid arrangement in terms of strength.
  • filaments 10 which are expediently made of niobium wire, are passed through the ceramic terminating element 8, which closes off the ceramic discharge tube 3.
  • two filaments 10 are electrically short-circuited within the discharge space, and bent in a U-shape, in such a way that one filament 10, which is bent in a U-shape and expediently made of niobium, with the electrode 11, and the other also U -formally bent filament 10 is electrically connected to an auxiliary electrode 13.
  • the free ends of the filaments 10 protruding from the discharge space are twisted in pairs outside the discharge space, and they serve as current leads 9a and 9.
  • the power supply line 9 is made from three pieces of filaments 10 which are passed through the ceramic terminating element 8, which closes off the ceramic discharge tube 3. These are expediently made of niobium wire, in such a way that the three pieces of filaments 10 are connected to the electrode 11 at their ends projecting into the discharge space. The ends of the three filaments 10 protruding from the discharge space are twisted together outside the discharge space.
  • the invention is in no way limited to the exemplary embodiments described above.
  • the invention can also be carried out in such a way that only two or more elementary threads, which expediently consist of niobium wire, are passed through the ceramic terminating element and thus form the electrical power supply for the lamp, this being able to be realized in numerous possible variations. This is possible in particular because the number of filaments and the dimensions of these filaments are closely related to the power of the electric discharge lamp and are extremely variable.
  • the power supply can consist of two, three, four, five, etc. filaments depending on the power of the lamp and can be of any shape.
  • the arrangement of the filaments that form the current supply is indifferent in the ceramic terminating element. It is only essential that the filaments are soldered separately into the ceramic terminating element, apart from the type of their arrangement. The centering of the electrodes, the support of them, and their welding are facilitated if even-numbered i.e. two or four uses each. Elementary threads are used. If you want to use one or more of the filaments as a power supply for an auxiliary electrode, the use of odd-numbered filaments is more advantageous in this case. In the latter case, in the sense of the invention, as described above, the power supply for the main electrode can be formed from at least two or more filaments. The diameter of the filaments forming the power supply and the profile thereof can be chosen freely within the limits mentioned. The wires can have a circular, triangular or square cross-section.

Description

Die Erfindung betrifft eine elektrische Entladungslampe mit einem länglichen Entladungsgefäss aus Keramik und an beiden Enden im Entladungsgefäss angeordneten Elektroden gemäss dem Oberbegriff des Patentanspruchs 1.The invention relates to an electric discharge lamp with an elongate discharge vessel made of ceramic and electrodes arranged at both ends in the discharge vessel according to the preamble of patent claim 1.

Derartige Entladungslampen sind aus der US-PS 3 992 642 bzw. 3 882 346 bekannt. Die Stromzuführung zu den Elektroden besteht hierbei aus jeweils einem Niob-Draht, der durch die jeweilige Keramikplatte hindurchgeführt ist, und zwar vakuumdicht.Discharge lamps of this type are known from US Pat. Nos. 3,992,642 and 3,882,346, respectively. The power supply to the electrodes consists of a niobium wire, which is passed through the respective ceramic plate, in a vacuum-tight manner.

Aus der Praxis sind darüberhinaus Entladungslampen bekannt, bei denen die Stromzuführung aus Niob-Röhrchen besteht, die mit die Enden des Entladungsgefässes - umgreifenden Niobverschlusskappen verschweisst sind. Der Leiterquerschnitt wurde in allen diesen Fällen von der vorgegebenen Leitung - d. h. des durchzusetzenden Stromes - bestimmt.Discharge lamps are also known in practice, in which the power supply consists of niobium tubes which are welded to niobium sealing caps which encompass the ends of the discharge vessel. In all of these cases, the conductor cross-section was determined by the specified line - i.e. H. of the current to be enforced - determined.

Wenn die Verschlusskappen aus dem gleichen Metall wie die Stromzuführungen bestanden, so ergaben sich aus der Erwärmung der Stromzuführungen keine Probleme, weil die Wärmeausdehnungskoeffizienten gleich waren. Wurden an Stelle der Metallkappen Keramikplatten zum vakuumdichten Verschliessen des Entladungsgefässes benutzt, so führten aufgrund der unterschiedlichen Wärmeausdehnungskoeffizienten auftretende Wärmespannungen zu Dilatationswirkungen und letztlich zu Rissen im Bereich der Durchführungen der Stromleiter durch die Keramikplatten. Mit derAusbildung der Stromzuführungen in Form von Röhrchen - die eine Eigenelastizität besitzen - liessen sich zwar die Probleme vermindern nicht aber beseitigen.If the sealing caps were made of the same metal as the power supply leads, the heating of the power supply leads did not pose any problems because the coefficients of thermal expansion were the same. If ceramic plates were used instead of the metal caps for the vacuum-tight sealing of the discharge vessel, the thermal stresses occurring due to the different coefficients of thermal expansion led to dilatation effects and ultimately to cracks in the area where the current conductors passed through the ceramic plates. With the formation of the power supply in the form of tubes - which have their own elasticity - the problems could not be reduced but not eliminated.

Andererseits waren Leistungserhöhungen Grenzen gesetzt, weil der Querschnitt der Stromzuführungen nicht beliebig vergrössert werden konnte, um die Wärmespannungen gering zu halten.On the other hand, there were limits to increases in power, because the cross-section of the power supply lines could not be enlarged to keep the thermal stresses low.

Ausserdem sind die Herstellungskosten für Niob-röhrchen vergleichsweise sehr hoch, so dass wirtschaftliche Grenzen ebenfalls zu berücksichtigen waren.In addition, the production costs for niobium tubes are comparatively high, so that economic limits also had to be taken into account.

Der Erfindung liegt daher die Aufgabe zugrunde, die elektrische Entladungslampe der eingangs genannten Art so auszubilden, dass auch bei notwendigerweise grösserer Stromleitungsquerschnitten keine schädlichen Wärmespannungen zwischen Stromzuführung und Entladungsgefäss bzw. den das Entladungsgefäss verschliessenden Keramikplatten auftreten.The invention is therefore based on the object of designing the electric discharge lamp of the type mentioned at the outset in such a way that, even with necessarily larger power line cross sections, no harmful thermal stresses occur between the power supply and the discharge vessel or the ceramic plates sealing the discharge vessel.

Gelöst wird diese Aufgabe erfindungsgemäss durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale.This object is achieved according to the invention by the features specified in the characterizing part of patent claim 1.

Vorzugsweise Ausgestaltungen ergeben sich aus den Unteransprüchen.Refinements preferably result from the subclaims.

Mit der erfindungsgemässen Lösung konnte erreicht werden, dass einerseits durch die Aufteilung des Stromleiters in mehrere dünne Drähte die notwendige Gesamtquerschnittsfläche für die Stromzuführung zur Verfügung steht, dass aber andererseits zwischen den dünnen Einzeldrähten und den Keramikplatten bzw. dem die Drähte vakuumdicht einschliessenden Lötmaterial keine schädlichen Wärmespannungen auftreten.With the solution according to the invention it was possible to achieve that, on the one hand, by dividing the current conductor into several thin wires, the necessary total cross-sectional area for the power supply is available, but on the other hand, no harmful thermal stresses exist between the thin individual wires and the ceramic plates or the solder material enclosing the wires in a vacuum-tight manner occur.

Die Erfindung soll nachfolgend anhand der Ausführungsbeispiele in den Zeichnungen erläutert werden.The invention will be explained below using the exemplary embodiments in the drawings.

Dabei zeigt:

  • Fig. 1 den Aufbau einer elektrischen Entladungslampe mit Keramikentladungsrohr gemäss der Erfindung, als komplette Montageeinheit, in einem Glaskolben untergebracht und mit Sockel versehen,
  • Fig. 2 ein Ausführungsbeispiel in zwei Seitensichten und in Draufsicht, bei welchem die innerhalb des Entladungsraumes vorhandenen Elektroden mit jeweils aus vier elementaren Fäden, zweckmässig aus Niobdrähten ausgebildeten äusseren Stromzuleitungen verbunden sind,
  • Fig. 3 ein weiteres Ausführungsbeispiel in zwei Seitensichten, bei welchem die aus vier elementaren Fäden, zweckmässig aus Niob, hergestellte Stromzuleiter derart ausgeführt sind, dass zwei von den elementaren Fäden den äusseren Stromzuleiter mit der im Entladungsraum angeordneten Elektrode, und die übrigen zwei elementaren Fäden den äusseren Stromleiter mit einer ebenfalls im Entladungsraum befindlichen Hilfselektrode verbinden, und
  • Fig. 4 zeigt im Schnitt und in Draufsicht ein weiteres Ausführungsbeispiel, bei welchem drei elementare Fäden, die zweckmässig aus Niob- draht hergestellt sind, und elementare Fäden eines durch das Keramikabschliessorgan durchgehenden Stromzuleiters bilden, sowohl ausserhalb wie auch innerhalb des Entladungsraumes miteinander verflochten bzw. verdrillt sind.
It shows:
  • 1 shows the structure of an electric discharge lamp with a ceramic discharge tube according to the invention, as a complete assembly unit, housed in a glass bulb and provided with a base,
  • 2 shows an exemplary embodiment in two side views and in plan view, in which the electrodes present within the discharge space are each connected to outer current leads formed from four elementary threads, expediently formed from niobium wires,
  • Fig. 3 shows another embodiment in two side views, in which the current feeder made of four elementary threads, expediently made of niobium, are designed such that two of the elementary threads form the outer current feeder with the electrode arranged in the discharge space, and the remaining two elementary threads connect the outer conductor to an auxiliary electrode which is also located in the discharge space, and
  • 4 shows, in section and in plan view, a further exemplary embodiment, in which three elementary threads, which are expediently made of niobium wire, and elementary threads of a current feeder passing through the ceramic closure element, are interwoven with one another both outside and inside the discharge space or are twisted.

Die Erfindung wird nachstehend mit Hilfe der Zeichnung näher beschrieben.The invention is described below with the aid of the drawing.

Figur 1 zeigt eine erfindungsgemäss ausgebildete Entladungslampe als Beispiel, welche in einem mit Lampensockel 7 versehenen, mit Inertgas gefüllten oder evakuisierten Glaskolben 4 ein Keramikentladungsrohr 3, dessen beide Enden durch aus Keramik bestehende Abschlussglieder 8 verschlossen sind, enthält. Im Innenraum des Keramikentladungsrohres 3 sind beiderends Elektroden 11 vorhanden, zu welchen die Stromzuleitung durch aus Elementarfäden 10, zweckmässig aus Niobdrähten, die einzeln vakuumdicht durch die Abschlussglieder 8 hindurchgeführt und ausserhalb des Entladungsrohres miteinander verflochten bzw. verdrillt sind, bestehende Stromzuführungen 9 erfolgt. Zur elektrischen Verbindung der Stromzuführungen 9 zum Lampensockel 7 dienen an einem Ende des Keramikentladungsrohres 3 ein Stromzuführungsbügel 1 und ein im Glaskolben 4 durch einen Stützring 12 abgestützter längerer Halter 2, und am anderen Ende des Entladungsrohres ein mit einem kürzeren Halter 5 verschweisster oder verlöteter Stromzuführungsbügel 6.FIG. 1 shows a discharge lamp designed according to the invention as an example, which contains a ceramic discharge tube 3 in a glass bulb 4 provided with lamp base 7, filled or evacuated with inert gas, the two ends of which are closed by end elements 8 made of ceramic. In the interior of the ceramic discharge tube 3 there are electrodes 11 at both ends, to which the current supply line is provided by current leads 9 consisting of filaments 10, expediently of niobium wires, which are individually vacuum-tightly passed through the terminating members 8 and are braided or twisted outside the discharge tube. A power supply bracket 1 and a longer holder 2 supported in the glass bulb 4 by a support ring 12, and at the other end of the discharge tube a power supply bracket 6 welded or soldered to a shorter bracket 5 serve for the electrical connection of the power supply lines 9 to the lamp base 7 .

In Figur 2 ist als Ausführungsbeispiel ein Ende einer elektrischen Entladungslampe mit Keramikentladungsrohr 3 gemäss der Erfindung ausführlich dargestellt. Durch das das Keramikentladungsrohr 3 abschliessende Keramikabschliessglied 8 sind aus vier elementaren Fäden 10 aus Niobdraht bestehende Stromführungen 9 hindurchgeführt, deren je zwei Fäden mit der Elektrode 11 im Entladungsraum, sowohl elektrisch als auch wärmeleitend an ihrem U-förmig gebogenen Teil verbunden sind. Die aus dem Entladungsraum herausragenden vier elementaren Fäden 10, sind miteinander verdrillt, und sie bilden in Hinsicht der Festigkeit eine starre Anordnung.In FIG. 2, one end of an electric discharge lamp with a ceramic discharge tube 3 according to the invention is shown in detail as an exemplary embodiment. Through the ceramic outlet The end tube 3 terminating ceramic 8 are made of four elementary threads 10 made of niobium wire current leads 9, the two threads are connected to the electrode 11 in the discharge space, both electrically and thermally conductive on its U-shaped bent part. The four elementary threads 10 protruding from the discharge space are twisted together and form a rigid arrangement in terms of strength.

Die Ausführung nach Figur 2 wird nachstehenderweise hergestellt:

  • An dem Keramikabschliessglied 9 sind vier Bohrungen vorgesehen und zwei aus Niobdraht bestehende Elementarfäden 10, die vorher auf U-form gebogen sind, werden in jeweils zwei Bohrungen eingeführt und mit keramikartigem oder glasartigem Lötmittel vakuumdicht eingelötet. Die U-förmigen Elementarfäden 10 werden beiderseits mit der Elektrode 11 verschweisst. Die Elementarfäden 10, zweckmässig Niobdrähte werden auf der anderen Seite des Keramikabschlussgliedes 8 an ihren freien Enden miteinander verdrillt. Auf diese Weise wird eine aus Elementarfäden 10, zweckmässig aus Niobdrähten bestehende Stromzuführung 9 gebildet, die an beiden Enden des Keramikabschlussgliedes 8 wärmeleitend und elektrisch vereinigt ist. Die auf diese Weise hergestellten Keramikabschlussglieder werden mit den Enden des Keramikentladungsrohres 3 vakuumdicht zusammengelötet. Bei einem solchen Ausführungsbeispiel betragen bei einer Hochdruck-Natriumdampflampe von 220 V/400 W der innere Durchmesser des Keramikentladungsrohres 3,8 mm, der Durchmesser des verwendeten Niobdrähte 0,5 mm, und der Kerndurchmesser der Wolframelektrode 1,2 mm.
The embodiment according to FIG. 2 is produced as follows:
  • Four holes are provided on the ceramic closure element 9 and two elementary threads 10 consisting of niobium wire, which are previously bent into a U-shape, are inserted into two holes each and soldered in a vacuum-tight manner with ceramic-like or glass-like solder. The U-shaped filaments 10 are welded to the electrode 11 on both sides. The filaments 10, expediently niobium wires, are twisted together at their free ends on the other side of the ceramic terminating element 8. In this way, a current supply 9 consisting of filaments 10, expediently made of niobium wires, is formed, which is thermally and electrically combined at both ends of the ceramic terminating element 8. The ceramic termination elements produced in this way are soldered together in a vacuum-tight manner with the ends of the ceramic discharge tube 3. In such an embodiment, the inner diameter of the ceramic discharge tube is 3.8 mm, the diameter of the niobium wire used is 0.5 mm, and the core diameter of the tungsten electrode is 1.2 mm for a high-pressure sodium vapor lamp of 220 V / 400 W.

Bei einem Ausführungsbeispiel gemäss Figur 3 sind durch das Keramikabschlussglied 8, das das Keramikentladungsrohr 3 abschliesst, vier Stück Elementarfäden 10, die zweckmässig aus Niob- draht hergestellt sind, hindurchgeführt. Von diesen werden je zwei Elementarfäden 10 innerhalb des Entladungsraumes elektrisch kurzgeschlossen, und U-förmig gebogen, und zwar so, dass ein Elementarfaden 10, der U-förmig gebogen und zweckmässig aus Niob hergestellt ist, mit der Elektrode 11, und der andere ebenfalls U-förmig gebogene Elementarfaden 10 mit einer Hilfselektrode 13 elektrisch verbunden ist. Die aus dem Entladungsraum herausragenden freien Enden der Elementarfäden 10 werden ausserhalb des Entladungsraumes entsprechend paarweise verdrillt, und sie dienen als Stromzuführungen 9a bzw. 9.In an exemplary embodiment according to FIG. 3, four pieces of filaments 10, which are expediently made of niobium wire, are passed through the ceramic terminating element 8, which closes off the ceramic discharge tube 3. Of these, two filaments 10 are electrically short-circuited within the discharge space, and bent in a U-shape, in such a way that one filament 10, which is bent in a U-shape and expediently made of niobium, with the electrode 11, and the other also U -formally bent filament 10 is electrically connected to an auxiliary electrode 13. The free ends of the filaments 10 protruding from the discharge space are twisted in pairs outside the discharge space, and they serve as current leads 9a and 9.

Bei dem Ausführungsbeispiel nach Figur 4 ist die Stromzuführung 9 aus drei Stück Elementarfäden 10 hergestellt, die durch das Keramikabschlussglied 8, das das Keramikentladungsrohr 3 abschliesst, hindurchgeführt sind. Diese sind zweckmässig aus Niobdraht hergestellt, und zwar derart, dass die drei Stück Elementarfäden 10 an ihren in den Entladungsraum einragenden Enden an die Elektrode 11 angeschlossen sind. Die aus dem Entladungsraum herausragenden Enden der drei Elementarfäden 10 werden ausserhalb des Entladungsraumes miteinander verdrillt.In the exemplary embodiment according to FIG. 4, the power supply line 9 is made from three pieces of filaments 10 which are passed through the ceramic terminating element 8, which closes off the ceramic discharge tube 3. These are expediently made of niobium wire, in such a way that the three pieces of filaments 10 are connected to the electrode 11 at their ends projecting into the discharge space. The ends of the three filaments 10 protruding from the discharge space are twisted together outside the discharge space.

Die Erfindung ist in keiner Weise auf die obenbeschriebenen Ausführungsbeispiele begrenzt. Die Erfindung kann auch derart ausgeführt sein, dass nur zwei, oder noch mehrere Elementarfäden, die zweckmässig aus Niobdraht bestehen, durch das Keramikabschlussglied hindurchgeführt werden, und somit die elektrische Stromzuführung der Lampe bilden, wobei dies in zahlreichen Variationsmöglichkeiten verwirklicht sein kann. Dies ist insbesondere deshalb möglich, weil die Zahl der Elementarfäden und die Abmessungen dieser Fäden mit der Leistung der elektrischen Entladungslampe stark zusammenhängt und äusserst variabel ist.The invention is in no way limited to the exemplary embodiments described above. The invention can also be carried out in such a way that only two or more elementary threads, which expediently consist of niobium wire, are passed through the ceramic terminating element and thus form the electrical power supply for the lamp, this being able to be realized in numerous possible variations. This is possible in particular because the number of filaments and the dimensions of these filaments are closely related to the power of the electric discharge lamp and are extremely variable.

Praktische Untersuchungen haben bewiesen, dass der Querschnitt der Elementarfäden über 0,3 mm2 zweckmässigerweise nicht erhöht werden soll, besonders im Falle der Anwendung von Niobdraht, weil die schädliche Wirkung der entstehenden Wärmestösse, bei Anwendung von Drähten höherer Querschnitte in der Klebe- bzw. Lötzone im Keramikabschlussglied bereits Risse verursacht.Practical investigations have shown that the cross-section of the filaments over 0.3 mm 2 should not be increased, especially when using niobium wire, because the harmful effects of the resulting thermal shock when using wires with higher cross-sections in the adhesive or Soldering zone in the ceramic terminating element has already caused cracks.

Die Stromzuführung kann im Sinne der Erfindung in Abhängigkeit von der Leistung der Lampe aus zwei, drei, vier, fünf, usw. Elementarfäden bestehen und in beliebiger Form ausgebildet.According to the invention, the power supply can consist of two, three, four, five, etc. filaments depending on the power of the lamp and can be of any shape.

Hinsichtlich der Erfindung ist die Anordnung der Elementarfäden, die die Stromzuführung bilden, in dem Keramikabschlussglied indifferent. Wesentlich ist nur, dass die Elementarfäden voneinander getrennt jeweils einzeln in das Keramikabschlussglied, abgesehen von der Art ihrer Anordnung eingelötet werden. Die Zentierung der Elektroden, die Abstützung derselben, und ihre Verschweissung sind erleichtert, falls geradzahlige d.h. jeweils zwei oder vier use. Elementarfäden verwendet werden. Will man von den Elementarfäden einen oder mehrere als Stromzuführung für eine Hilfselektrode benützen, so ist in diesem Falle die Anwendung von Fäden ungerader Anzahl vorteilhafter. In letzterem Falle kann man im Sinne der Erfindung, wie oben beschrieben, die Stromzuführung für die Hauptelektrode wenigstens aus zwei oder aus mehreren Elementarfäden ausbilden. Der Durchmesser der die Stromzuführung bildenden Elementarfäden und das Profil derselben können innerhalb der genannten Grenzen frei gewählt werden. Dabei können die Drähte kreis-, dreieck- oder viereckförmigen Querschnitt aufweisen.With regard to the invention, the arrangement of the filaments that form the current supply is indifferent in the ceramic terminating element. It is only essential that the filaments are soldered separately into the ceramic terminating element, apart from the type of their arrangement. The centering of the electrodes, the support of them, and their welding are facilitated if even-numbered i.e. two or four uses each. Elementary threads are used. If you want to use one or more of the filaments as a power supply for an auxiliary electrode, the use of odd-numbered filaments is more advantageous in this case. In the latter case, in the sense of the invention, as described above, the power supply for the main electrode can be formed from at least two or more filaments. The diameter of the filaments forming the power supply and the profile thereof can be chosen freely within the limits mentioned. The wires can have a circular, triangular or square cross-section.

Claims (4)

1. Electric discharge lamp, with an elongated discharge vessel of ceramic material and electrodes arranged at the two ends of the discharge vessel as well as ceramic plates closing the ends of the discharge vessel through which are passed current lead-in conductors for the electrodes, which conductors are made essentially from niobium and which are vacuum-tightly sealed-in by means of a ceramic or vitreous solder material, characterised in that the current lead-in conductors (10) for the electrodes (1) each consist of a plurality of wires individually passed vacuum-tightly through the ceramic plates (8) and having a maximum cross-sectional area of 0.3 mm2.
2. Electric discharge lamp according to claim 1 characterised in that the current lead-in conductors consist of two wires which are short-circuited externally of the discharge space.
3. Electric discharge lamp according to claim 1 characterised in that the wires are twisted or stranded externally of the discharge space.
4. Electric discharge lamp according to claims 1 to 3 characterised in that the wires have a circular, triangular or quadrangular cross-section.
EP81730009A 1980-02-11 1981-01-23 Electric discharge lamp Expired EP0034113B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HUEY000304 1980-02-11
HU8080304A HU178836B (en) 1980-02-11 1980-02-11 Electric discharge lamp of ceramic bulb

Publications (2)

Publication Number Publication Date
EP0034113A1 EP0034113A1 (en) 1981-08-19
EP0034113B1 true EP0034113B1 (en) 1984-12-05

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US (1) US4376905A (en)
EP (1) EP0034113B1 (en)
JP (1) JPS56128561A (en)
AR (1) AR223093A1 (en)
BR (1) BR8100689A (en)
DD (1) DD156209A1 (en)
DE (1) DE3167525D1 (en)
ES (1) ES8202185A1 (en)
HU (1) HU178836B (en)
IN (1) IN154885B (en)
SU (1) SU1138057A3 (en)
ZA (1) ZA81274B (en)

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HU181782B (en) * 1981-01-09 1983-11-28 Egyesuelt Izzolampa Discharge vessel for high-pressure sodium-vapour discharge lamps
HU182834B (en) * 1982-02-25 1984-03-28 Egyesuelt Izzolampa Electric current lead-in, preferably for discharge vessel of high-pressure gas-discharge light-sources
US4742269A (en) * 1984-11-09 1988-05-03 Ngk Insulators, Ltd. Ceramic envelope device for high-pressure discharge lamp
DE9112690U1 (en) * 1991-10-11 1991-12-05 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
DE9207816U1 (en) * 1992-06-10 1992-08-20 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
DE4242122A1 (en) * 1992-12-14 1994-06-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Process for producing a vacuum-tight seal between a ceramic and a metallic partner, in particular for use in the manufacture of a discharge vessel for a lamp, and discharge vessels and lamps produced therewith
DE4242123A1 (en) * 1992-12-14 1994-06-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp with a ceramic discharge tube
JP4953242B2 (en) * 2004-06-08 2012-06-13 日本碍子株式会社 Luminescent container and assembly thereof
US7288303B2 (en) 2004-06-08 2007-10-30 Ngk Insulators, Ltd. Structures of brittle materials and metals
US7521870B2 (en) 2004-06-08 2009-04-21 Ngk Insulators, Ltd. Luminous containers and those for high pressure discharge lamps

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US2329118A (en) * 1941-07-12 1943-09-07 Gen Electric Electrode for electrical discharge devices
US2452626A (en) * 1945-03-03 1948-11-02 Gen Electric X Ray Corp Electron emitter
US3992642A (en) * 1975-12-15 1976-11-16 Mcvey Charles I Ceramic envelope plug and lead wire and seal
NL183613B (en) * 1978-03-15 1988-07-01 Philips Nv ELECTRIC LAMP.
US4295075A (en) * 1979-12-14 1981-10-13 Gte Products Corporation Arc discharge lamp having ceramic arc tube

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DE3167525D1 (en) 1985-01-17
ES499273A0 (en) 1982-01-16
JPH0255905B2 (en) 1990-11-28
HU178836B (en) 1982-07-28
US4376905A (en) 1983-03-15
JPS56128561A (en) 1981-10-08
SU1138057A3 (en) 1985-01-30
BR8100689A (en) 1981-08-18
ZA81274B (en) 1982-04-28
ES8202185A1 (en) 1982-01-16
EP0034113A1 (en) 1981-08-19
IN154885B (en) 1984-12-22
AR223093A1 (en) 1981-07-15
DD156209A1 (en) 1982-08-04

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