EP0220673A2 - High-pressure discharge lamp - Google Patents

High-pressure discharge lamp Download PDF

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Publication number
EP0220673A2
EP0220673A2 EP86114648A EP86114648A EP0220673A2 EP 0220673 A2 EP0220673 A2 EP 0220673A2 EP 86114648 A EP86114648 A EP 86114648A EP 86114648 A EP86114648 A EP 86114648A EP 0220673 A2 EP0220673 A2 EP 0220673A2
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EP
European Patent Office
Prior art keywords
electrode
arc
discharge
discharge lamp
pressure discharge
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Granted
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EP86114648A
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German (de)
French (fr)
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EP0220673A3 (en
EP0220673B1 (en
Inventor
Jürgen Dr. Heider
Richard Kotschenreuther
Wolfgang Schade
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0220673A3 publication Critical patent/EP0220673A3/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 discharge vessel made of quartz glass, which is squeezed on one side and which, in addition to a filling of mercury and additions of metal halides and noble gas, has two electrodes which consist of high-melting metal wire, the shafts of which are melted into the pinch in a vacuum-tight manner via molybdenum foils and the tips of which , at which the discharge begins, point in the direction of the discharge running transversely to the shafts.
  • Such a high-pressure discharge lamp for direct current operation with a power consumption of less than 100 W is known from US Pat. No. 4,415,829.
  • a helix is attached to the cathode near the tip.
  • the poor sheet acceptance is due in particular to the slow heating of the electrode to operating temperature, such an electrode usually also has a large heat loss.
  • the heating time is proportional to the square of the radius of the electrode wire and indirectly proportional to the length of the electrode and the current of the lamp. If one assumes a fixed radius of the electrode wire and a certain fixed operating current of the lamp, the heating-up time can be shortened by increasing the electrode length.
  • the aim of the invention is to create a high-pressure discharge lamp that is squeezed on one side, which ensures quick and safe ignition and at the same time has a precisely defined arch attachment for installation in optical systems, such as Headlight is suitable.
  • the high-pressure discharge lamp with the features mentioned in the preamble of the main claim is invented according to the invention characterized in that the metal wire of each electrode near the tip facing the discharge describes an arc that appears closed in plan view, the arc is on the side of the electrode shaft facing away from the discharge and the crossing wire parts do not touch each other.
  • the increase in the electrode length required for a quick and flawless ignition is achieved without the electrode spacing and thus the arc length changing and at the same time forming a tip for the start of the discharge, which defines the arc position over the entire life of the lamp .
  • the tips of the electrodes are essentially aligned such that the discharge intersects the axis of symmetry of the discharge vessel.
  • each point of the arc forms an angle of at most ⁇ 30 ° with the plane formed by the discharge and the electrode shafts. If the entire arch were in this plane, the crossing wire parts would have to be connected to one another. This would, however, cancel the desired increase in the electrode length.
  • the arc should be shaped so that it has a sector of a circle with a central angle of at least 180 can be inscribed and the tip of the electrodes forms a 90 ° angle with the electrode shaft.
  • the radius of the sector of the circle that can be inscribed on the arc must at least correspond to the radius of the electrode wire. In addition to the simple and inexpensive manufacture of the electrode, this prevents a thermal short-circuit from occurring and the electrode wire in the arc being cracked due to its brittleness due to excessive kinks, which are the starting points for corrosion (especially in the case of tin-sodium halides in the filling) ) form.
  • the difference between the distance between the two electrode shafts and the distance between the two protruding electrode tips must be at least twice the diameter of the electrode wire. This ensures the defined arc attachment at the tip of the electrode and thus the defined arc position over the entire life of the lamp - despite the erosion of the electrode tip.
  • FIG. 1 shows the structure of a high-pressure discharge lamp 1 with a discharge vessel 2 made of quartz glass, which is squeezed on one side, the discharge vessel 2 being surrounded by an outer bulb 3, which is also squeezed on one side.
  • the schematically illustrated electrodes 4, 5 are melted in a gas-tight manner into the pinch 8 of the discharge vessel 2 by means of molybdenum foils 6, 7 and are connected to the molybdenum sealing foils 11, 12 in the pinch 13 of the outer bulb 3 via current leads 9, 10.
  • Electrical connection pins 14, 15 are also attached to the sealing foils 11, 12 and establish the connection with the connections of the standardized base, which is not shown here for reasons of clarity.
  • a zirconium getter 17 which is attached to a metal plate 16, is fastened to the pinch 8 of the discharge vessel 2.
  • the lamp As a filling in the discharge vessel 2, the lamp has metal iodides and bromides of sodium, tin, thallium, indium and lithium in addition to mercury and a noble gas. With a power consumption of 40 W, the lamp achieves a luminous efficacy of approx. 75 lm / W.
  • FIGS 2 and 3 show an enlarged view of the discharge vessel 2 with the two electrodes 4 and 5.
  • the electrodes 4, 5 consist of a 0.2 mm thick tungsten wire with a round cross section and each have a circular 270 0 near the electrode tips 18, 19 Arch 20, 21 in the form of an eyelet.
  • the arcs 20, 21 lie on the sides of the electrode shafts 22, 23 facing away from the discharge and have an inner diameter of 0.3 mm.
  • the electrode tips 18, 19 each form one with the shafts 22, 23 90 ° angle and protrude 0.3 mm beyond the intersection points 24, 25.
  • the wire parts of the electrodes 4, 5 are each at a distance of approximately 0.05 mm from one another.
  • the shafts 22, 23 have a length of approximately 7 mm from the point of intersection 24, 25 to the attachment point 26, 27 on the respective molybdenum sealing foils 6, 7 in the pinch 8.
  • the electrode wire for both electrodes 4, 5 is pulled past the same side of the electrode shaft 22, 23. This simplifies the manufacture of the electrodes 4, 5, since only one version of the electrodes has to be manufactured.
  • the electrode shafts 22, 23 are each rotated approximately 27 ° relative to one another so that the tips 18, 19 of the electrodes 4, 5 point in the direction of the discharge arc.

Abstract

Bei einer Hochdruckentladungslampe mit einem einseitig gequetschten Entladungsgefäss (2) bestehen die Elektroden (4, 5) aus hochschmelzendem Metalldraht, wobei der Metalldraht jeder Elektrode (4, 5) nahe der der Entladung zugewandten Spitze (18, 19) einen Bogen (20, 21) beschreibt, der in Draufsicht geschlossen erscheint. Der Bogen (20, 21) liegt jeweils auf der von der Entladung abgewandten Seite des Elektrodenschaftes (22, 23) und die sich kreuzenden Drahtteile berühren einander nicht. In einer bevorzugten Ausführungsform ist der Bogen (20, 21) so geformt, dass ihm ein Kreissektor mit einem Zentriwinkel von mindestens 180° einbeschrieben werden kann und die Spitze (18, 19) der Elektrode (4, 5) mit dem Elektrodenschaft (22, 23) einen 90°-Winkel bildet. Mit solchen Elektroden wird eine schnelle und einwandfreie Zündung und eine genau definierte Bogenlage über die gesamte Lebensdauer der Lampe erreicht.In the case of a high-pressure discharge lamp with a discharge vessel (2) squeezed on one side, the electrodes (4, 5) consist of high-melting metal wire, the metal wire of each electrode (4, 5) having an arc (20, 21) near the tip (18, 19) facing the discharge ) that appears closed when viewed from above. The arc (20, 21) lies on the side of the electrode shaft (22, 23) facing away from the discharge and the crossing wire parts do not touch each other. In a preferred embodiment, the arc (20, 21) is shaped such that a circular sector with a central angle of at least 180 ° can be inscribed on it and the tip (18, 19) of the electrode (4, 5) with the electrode shaft (22, 23) forms a 90 ° angle. With such electrodes, a quick and flawless ignition and a precisely defined arc position are achieved over the entire life of the lamp.

Description

Die Erfindung betrifft eine Hochdruckentladungslampe mit einem einseitig gequetschten Entladungsgefäß aus Quarzglas, das neben einer Füllung aus Quecksilber sowie Zusätzen von Metallhalogeniden und Edelgas zwei Elektroden aufweist, die aus hochschmelzendem Metalldraht bestehen, deren Schäfte über Molybdän-Folien vakuumdicht in die Quetschung eingeschmolzen sind und deren Spitzen, an denen die Entladung ansetzt, in Richtung der quer zu den Schäften verlaufenden Entladung weisen.The invention relates to a high-pressure discharge lamp with a discharge vessel made of quartz glass, which is squeezed on one side and which, in addition to a filling of mercury and additions of metal halides and noble gas, has two electrodes which consist of high-melting metal wire, the shafts of which are melted into the pinch in a vacuum-tight manner via molybdenum foils and the tips of which , at which the discharge begins, point in the direction of the discharge running transversely to the shafts.

Aus der US-PS 44 15 829 ist eine solche Hochdruckentladungslampe für den Gleichstrombetrieb mit einer Leistungsaufnahme kleiner 100 W bekannt. Um zu gewährleisten, daß der Entladungsbogen an der Kathodenspitze ansetzt, ist nahe der Spitze auf der Kathode eine Wendel angebracht.Such a high-pressure discharge lamp for direct current operation with a power consumption of less than 100 W is known from US Pat. No. 4,415,829. In order to ensure that the discharge arc attaches to the cathode tip, a helix is attached to the cathode near the tip.

Ein großes Problem stellt bei diesem einseitig gequetschten Lampentyp das schnelle und einwandfreie Zünden der kalten und insbesondere das Wiederzünden der warmen Lampe dar. Eine langsame und schwere Zündung, die auf eine schlechte Bogenübernahme der Elektroden zurückzuführen ist, verursacht außerdem eine rasche Schwärzung des Entladungsgefäßes.A major problem with this type of lamp, which is squeezed on one side, is the quick and trouble-free ignition of the cold and, in particular, the re-ignition of the warm lamp. Slow and heavy ignition, which can be attributed to poor arc acceptance of the electrodes, also causes the discharge vessel to become black quickly.

Die schlechte Bogenübernahme ist insbesondere auf die langsame Aufheizung der Elektrode auf Betriebstemperatur zurückzuführen, wobei eine solche Elektrode meist zusätzlich einen großen Wärmeverlust aufweist. Die Aufheizzeit ist proportional zum Quadrat des Radius des Elektrodendrahtes und indirekt proportional zur Länge der Elektrode und zur Stromstärke der Lampe. Geht man also von einem festen Radius des Elektrodendrahtes und einer bestimmten festen Betriebsstromstärke der Lampe aus, so läßt sich eine Verkürzung der Aufheizzeit durch eine Vergrößerung der Elektrodenlänge erreichen.The poor sheet acceptance is due in particular to the slow heating of the electrode to operating temperature, such an electrode usually also has a large heat loss. The heating time is proportional to the square of the radius of the electrode wire and indirectly proportional to the length of the electrode and the current of the lamp. If one assumes a fixed radius of the electrode wire and a certain fixed operating current of the lamp, the heating-up time can be shortened by increasing the electrode length.

Dieser Tatsache wird in der DE-OS 32 42 840 durch eine Elektrode Rechnung getragen, die aus einem nahe der Einschmelzung befindlichen geraden Schaftteil und einem als Wendel ausgebildeten, der Entladung zugewandten zweiten Teil besteht, wobei benachbarte Windungen des Wendelteils einander nicht berühren. Bei einer solchen Elektrode kann der Entladungsbogen überall an der der Entladung zugewandten letzten Windung des Wendelteils ansetzen, so daß keine definierte Lage des Entladungsbogens im Entladungsgefäß zu erzielen ist. Eine Lampe mit solchermaßen ausgestalteten Elektroden ist daher für den Einsatz in Reflektoren oder anderen optischen Systemen, bei denen es auf eine feste Bogenlage ankommt, ungeeignet.This fact is taken into account in DE-OS 32 42 840 by an electrode which consists of a straight shaft part located near the melting point and a second part which is designed as a helix and faces the discharge, adjacent turns of the helical part not touching one another. With such an electrode, the discharge arc can start anywhere on the last turn of the coil part facing the discharge, so that no defined position of the discharge arc can be achieved in the discharge vessel. A lamp with electrodes configured in this way is therefore unsuitable for use in reflectors or other optical systems in which a fixed sheet position is important.

Ziel der Erfindung ist es, eine einseitig gequetschte Hochdruckentladungslampe zu schaffen, die eine schnelle und sichere Zündung gewährleistet und gleichzeitig durch einen genau definierten Bogenansatz für den Einbau in optische Systeme, wie z.B. Scheinwerfer geeignet ist.The aim of the invention is to create a high-pressure discharge lamp that is squeezed on one side, which ensures quick and safe ignition and at the same time has a precisely defined arch attachment for installation in optical systems, such as Headlight is suitable.

Die Hochdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen ist erfindungsgemäß dadurch gekennzeichnet, daß der Metalldraht jeder Elektrode nahe der der Entladung zugewandten Spitze einen Bogen beschreibt, der in Draufsicht geschlossen erscheint, wobei der Bogen auf der von der Entladung abgewandten Seite des Elektrodenschaftes liegt und die sich kreuzenden Drahtteile einander nicht berühren.The high-pressure discharge lamp with the features mentioned in the preamble of the main claim is invented according to the invention characterized in that the metal wire of each electrode near the tip facing the discharge describes an arc that appears closed in plan view, the arc is on the side of the electrode shaft facing away from the discharge and the crossing wire parts do not touch each other.

Mit einer solchen Elektrode wird die für eine schnelle und einwandfreie Zündung benötigte Vergrößerung der Elektrodenlänge erreicht, ohne daß sich dabei der Elektrodenabstand und damit die Bogenlänge ändert und gleichzeitig eine Spitze für den Ansatz der Entladung gebildet, die die Bogenlage über die gesamte Lebensdauer der Lampe festlegt. Außerdem werden bei einer symmetrischen Einquetschung der Elektrodenschäfte die Spitzen der Elektroden im wesentlichen so ausgerichtet, daß die Entladung die Symmetrieachse des Entladungsgefäßes schneidet.With such an electrode, the increase in the electrode length required for a quick and flawless ignition is achieved without the electrode spacing and thus the arc length changing and at the same time forming a tip for the start of the discharge, which defines the arc position over the entire life of the lamp . In addition, when the electrode shafts are symmetrically squeezed, the tips of the electrodes are essentially aligned such that the discharge intersects the axis of symmetry of the discharge vessel.

Am einfachsten gestaltet sich die Herstellung der Elektrode für die Lampe, wenn der Bogen - in Form einer Öse - im wesentlichen in der durch die Entladung und den Elektrodenschaft gebildeten Ebene liegt. Mit im wesentlichen soll dabei ausgesagt werden, daß jeder Punkt des Bogens einen Winkel von höchstens ± 30° mit der durch die Entladung und die Elektrodenschäfte gebildeten Ebene bildet. Würde der gesamte Bogen in dieser Ebene liegen, so müßten die kreuzenden Drahtteile miteinander verbunden sein. Dadurch wäre aber die gewünschte Vergrößerung der Elektrodenlänge wieder aufgehoben.The easiest way to manufacture the electrode for the lamp is when the arc - in the form of an eyelet - lies essentially in the plane formed by the discharge and the electrode shaft. Essentially, it should be stated that each point of the arc forms an angle of at most ± 30 ° with the plane formed by the discharge and the electrode shafts. If the entire arch were in this plane, the crossing wire parts would have to be connected to one another. This would, however, cancel the desired increase in the electrode length.

Der Bogen sollte möglichst so geformt sein, daß ihm ein Kreissektor mit einem Zentriwinkel von mindestens 180 einbeschrieben werden kann und die Spitze der Elektroden mit dem Elektrodenschaft einen 90°-Winkel bildet. Der Radius des Kreissektors, der dem Bogen einbeschrieben werden kann, muß dabei mindestens dem Radius des Elektrodendrahtes entsprechen. Auf diese Weise wird neben der einfachen und kostengünstigen Herstellung der Elektrode vermieden, daß ein thermischer Kurzschluß auftritt und der Elektrodendraht im Bogen aufgrund seiner Sprödigkeit durch zu starke Knicke Risse erhält, die Ansatzpunkte für eine Korrosion (insbesondere bei Zinn-Natrium-Halogeniden in der Füllung) bilden.The arc should be shaped so that it has a sector of a circle with a central angle of at least 180 can be inscribed and the tip of the electrodes forms a 90 ° angle with the electrode shaft. The radius of the sector of the circle that can be inscribed on the arc must at least correspond to the radius of the electrode wire. In addition to the simple and inexpensive manufacture of the electrode, this prevents a thermal short-circuit from occurring and the electrode wire in the arc being cracked due to its brittleness due to excessive kinks, which are the starting points for corrosion (especially in the case of tin-sodium halides in the filling) ) form.

Die Differenz zwischen dem Abstand der beiden Elektrodenschäfte und dem Abstand der beiden überstehenden Elektrodenspitzen muß mindestens zweimal dem Durchmesser des Elektrodendrahtes entsprechen. Dadurch wird über die gesamte Lebensdauer der Lampe - trotz des Abbrandes der Elektrodenspitze - der definierte Bogenansatz an der Spitze der Elektrode und damit die definierte Bogenlage gewährleistet.The difference between the distance between the two electrode shafts and the distance between the two protruding electrode tips must be at least twice the diameter of the electrode wire. This ensures the defined arc attachment at the tip of the electrode and thus the defined arc position over the entire life of the lamp - despite the erosion of the electrode tip.

Die Erfindung ist anhand der nachfolgenden Figuren näher veranschaulicht.

  • Figur 1 zeigt eine erfindungsgemäße Hochdruckentladungslampe mit einem Hüllkolben
  • Figur 2 zeigt eine Draufsicht des Entladungsgefäßes einer Hochdruckentladungslampe gemäß Figur 1
  • Figur 3 zeigt eine Seitenansicht des Entladungsgefäßes einer Hochdruckentladungslampe gemäß Figur 1
The invention is illustrated in more detail by the following figures.
  • Figure 1 shows a high-pressure discharge lamp according to the invention with an envelope bulb
  • FIG. 2 shows a top view of the discharge vessel of a high-pressure discharge lamp according to FIG. 1
  • FIG. 3 shows a side view of the discharge vessel of a high-pressure discharge lamp according to FIG. 1

In Figur 1 ist der Aufbau einer Hochdruckentladungslampe 1 mit einem einseitig gequetschten Entladungsgefäß 2 aus Quarzglas dargestellt, wobei das Entladungsgefäß 2 von einem ebenfalls einseitig gequetschten Außenkolben 3 umgeben ist. Die schematisch dargestellten Elektroden 4, 5 sind mittels Molybdän-Folien 6, 7 gasdicht in die Quetschung 8 des Entladungsgefäßes 2 eingeschmolzen und über Stromzuführungen 9, 10 mit den Molybdän-Dichtungsfolien 11, 12 in der Quetschung 13 des Außenkolbens 3 verbunden. An den Dichtungsfolien 11, 12 sind außerdem elektrische Anschlußstifte 14, 15 angebracht, die die Verbindung mit den Anschlüssen des hier - aus Gründen der Anschaulichkeit - nicht dargestellten genormten Sockels herstellen. An der Quetschung 8 des Entladungsgefäßes 2 ist außerdem ein auf einem Metallplättchen 16 angebrachter Zirkon-Getter 17 befestigt.FIG. 1 shows the structure of a high-pressure discharge lamp 1 with a discharge vessel 2 made of quartz glass, which is squeezed on one side, the discharge vessel 2 being surrounded by an outer bulb 3, which is also squeezed on one side. The schematically illustrated electrodes 4, 5 are melted in a gas-tight manner into the pinch 8 of the discharge vessel 2 by means of molybdenum foils 6, 7 and are connected to the molybdenum sealing foils 11, 12 in the pinch 13 of the outer bulb 3 via current leads 9, 10. Electrical connection pins 14, 15 are also attached to the sealing foils 11, 12 and establish the connection with the connections of the standardized base, which is not shown here for reasons of clarity. In addition, a zirconium getter 17, which is attached to a metal plate 16, is fastened to the pinch 8 of the discharge vessel 2.

Die Lampe weist als Füllung im Entladungsgefäß 2 neben Quecksilber und einem Edelgas Metalljodide und -bromide von Natrium, Zinn, Thallium, Indium und Lithium auf. Bei einer Leistungsaufnahme von 40 W erreicht die Lampe eine Lichtausbeute von ca. 75 lm/W.As a filling in the discharge vessel 2, the lamp has metal iodides and bromides of sodium, tin, thallium, indium and lithium in addition to mercury and a noble gas. With a power consumption of 40 W, the lamp achieves a luminous efficacy of approx. 75 lm / W.

Figuren 2 und 3 zeigen eine vergrößerte Ansicht des Entladungsgefäßes 2 mit den beiden Elektroden 4 und 5. Die Elektroden 4, 5 bestehen aus einem 0,2 mm dicken Wolframdraht mit rundem Querschnitt und weisen jeweils nahe der Elektrodenspitzen 18, 19 einen kreisförmigen 2700-Bogen 20, 21 in Form einer Öse auf. Die Bogen 20, 21 liegen auf den von der Entladung abgewandten Seiten der Elektrodenschäfte 22, 23 und besitzen einen inneren Durchmesser von 0,3 mm. Die Elektrodenspitzen 18, 19 bilden mit den Schäften 22, 23 jeweils einen 90°-Winkel und ragen 0,3 mm über die Kreuzungspunkte 24, 25 hinaus. An den Kreuzungspunkten 24, 25 weisen die Drahtteile der Elektroden 4, 5 jeweils einen Abstand von ca. 0,05 mm voneinander auf. Die Schäfte 22, 23 besitzen vom Kreuzungspunkt 24, 25 bis zum Befestigungspunkt 26, 27 an den jeweiligen Molybdän-Dichtungsfolien 6, 7 in der Quetschung 8 eine Länge von ca. 7 mm.Figures 2 and 3 show an enlarged view of the discharge vessel 2 with the two electrodes 4 and 5. The electrodes 4, 5 consist of a 0.2 mm thick tungsten wire with a round cross section and each have a circular 270 0 near the electrode tips 18, 19 Arch 20, 21 in the form of an eyelet. The arcs 20, 21 lie on the sides of the electrode shafts 22, 23 facing away from the discharge and have an inner diameter of 0.3 mm. The electrode tips 18, 19 each form one with the shafts 22, 23 90 ° angle and protrude 0.3 mm beyond the intersection points 24, 25. At the crossing points 24, 25, the wire parts of the electrodes 4, 5 are each at a distance of approximately 0.05 mm from one another. The shafts 22, 23 have a length of approximately 7 mm from the point of intersection 24, 25 to the attachment point 26, 27 on the respective molybdenum sealing foils 6, 7 in the pinch 8.

Bei der Herstellung der Bogen 20, 21 wird der Elektrodendraht für beide Elektroden 4, 5 jeweils an derselben Seite des Elektrodenschaftes 22, 23 vorbeigezogen. Dies vereinfacht die Herstellung der Elektroden 4, 5, da hiermit jeweils nur eine Ausführung von Elektroden gefertigt werden muß. Vor der Quetschung des Entladungsgefäßes 2 werden die Elektrodenschäfte 22, 23 jeweils ca. 27° zueinandergedreht, so daß die Spitzen 18, 19 der Elektroden 4, 5 in Richtung des Entladungsbogens weisen.In the production of the sheets 20, 21, the electrode wire for both electrodes 4, 5 is pulled past the same side of the electrode shaft 22, 23. This simplifies the manufacture of the electrodes 4, 5, since only one version of the electrodes has to be manufactured. Before the discharge vessel 2 is pinched, the electrode shafts 22, 23 are each rotated approximately 27 ° relative to one another so that the tips 18, 19 of the electrodes 4, 5 point in the direction of the discharge arc.

Claims (5)

1. Hochdruckentladungslampe (1) mit einem einseitig gequetschten Entladungsgefäß (2) aus Quarzglas, das neben einer Füllung aus Quecksilber sowie Zusätzen von Metallhalcgeniden und Edelgas zwei Elektroden (4, 5) aufweist, die aus hochschmelzendem Metalldraht bestehen, deren Schäfte (22, 23) über Molybdän-Folien (6, 7) vakuumdicht in die Quetschung (8) eingeschmolzen sind und deren Spitzen (18, 19), an denen die Entladung ansetzt, in Richtung der quer zu den Schäften (22, 23) verlaufenden Entladung weisen, dadurch gekennzeicheit, daß der Metalldraht jeder Elektrode (4, 5) nahe der der Entladung zugewandten Spitze (18, 19) einen Bogen (20, 21) beschreibt, der in Draufsicht geschlossen erscheint, wobei der Bogen (20, 21) auf der von der Entladung abgewandten Seite des Elektrodenschaftes (22, 23) liegt und die sich kreuzenden Drahtteile einander nicht berühren.1.High-pressure discharge lamp (1) with a discharge vessel (2) made of quartz glass, which is squeezed on one side and which, in addition to a mercury filling and additions of metal halide and noble gas, has two electrodes (4, 5) which consist of high-melting metal wire, the shafts (22, 23 ) are melted into the pinch (8) in a vacuum-tight manner via molybdenum foils (6, 7) and their tips (18, 19), at which the discharge begins, point in the direction of the discharge running transversely to the shafts (22, 23), characterized in that the metal wire of each electrode (4, 5) near the tip (18, 19) facing the discharge describes an arc (20, 21) which appears closed in plan view, the arc (20, 21) on that of side of the electrode shaft (22, 23) facing away from the discharge and the crossing wire parts do not touch each other. 2. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, daß der Bogen (20, 21) im wesentlichen in der durch die Entladung und den Elektrodenschaft (22, 23) gebildeten Ebene liegt.2. High-pressure discharge lamp according to claim 1, characterized in that the arc (20, 21) lies essentially in the plane formed by the discharge and the electrode shaft (22, 23). 3. Hochdruckentladungslampe nach Anspruch 1, dadurch gekennzeichnet, daß dem Bogen (20, 21) ein Kreissektor mit einem Zentriwinkel von mindestens 180° einbeschrieben werden kann und die Spitze (18, 19) der Elektrode (4, 5) mit dem Elektrodenschaft (22, 23) einen 900-Winkel bildet.3. High-pressure discharge lamp according to claim 1, characterized in that the arc (20, 21) a circular sector with a central angle of at least 180 ° can be inscribed and the tip (18, 19) of the electrode (4, 5) with the electrode shaft (22nd , 23) forms a 90 0 angle. 4. Hochdruckentladungslampe nach Anspruch 3, dadurch gekennzeichnet, daß der Radius des Kreissektors, der dem Bogen (20, 21) einbeschrieben werden kann, mindestens dem Radius des Elektrodendrahtes entspricht.4. High-pressure discharge lamp according to claim 3, characterized in that the radius of the sector of the circle the arc (20, 21) can be inscribed, at least corresponds to the radius of the electrode wire. 5. Hochdruckentladungslampe nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Differenz zwischen dem Abstand der beiden Elektrodenschäfte (22, 23) und dem Abstand der beiden überstehenden Elektrodenspitzen (18, 19) mindestens zweimal dem Durchmesser des Elektrodendrahtes entspricht.5. High-pressure discharge lamp according to one or more of claims 1 to 4, characterized in that the difference between the distance between the two electrode shafts (22, 23) and the distance between the two projecting electrode tips (18, 19) corresponds to at least twice the diameter of the electrode wire.
EP86114648A 1985-10-24 1986-10-22 High-pressure discharge lamp Expired - Lifetime EP0220673B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3537872 1985-10-24
DE19853537872 DE3537872A1 (en) 1985-10-24 1985-10-24 HIGH PRESSURE DISCHARGE LAMP

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EP0220673A2 true EP0220673A2 (en) 1987-05-06
EP0220673A3 EP0220673A3 (en) 1989-05-10
EP0220673B1 EP0220673B1 (en) 1992-03-04

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EP86114648A Expired - Lifetime EP0220673B1 (en) 1985-10-24 1986-10-22 High-pressure discharge lamp

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US (1) US4782266A (en)
EP (1) EP0220673B1 (en)
JP (1) JPS62100937A (en)
DE (2) DE3537872A1 (en)

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EP0343625A2 (en) * 1988-05-27 1989-11-29 Toshiba Lighting & Technology Corporation Single end-sealed metal halide lamp
AU604126B2 (en) * 1987-06-11 1990-12-06 Kabushiki Kaisha Toshiba High intensity discharge lamp of the one side sealed type capable of compensating for the change of luminous efficiency caused by its different lighting angles and manufacturing method of the same

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US4998036A (en) * 1987-12-17 1991-03-05 Kabushiki Kaisha Toshiba Metal vapor discharge lamp containing an arc tube with particular bulb structure
US4988917A (en) * 1988-12-16 1991-01-29 Gte Products Corporation Hooked electrode for arc lamp
EP0381035B1 (en) * 1989-01-31 1994-08-03 Toshiba Lighting & Technology Corporation Single side-sealed metal vapor discharge lamp
US5138229A (en) * 1989-09-20 1992-08-11 Toshiba Lighting & Technology Corporation Single-sealed metal vapor electric discharge lamp
US5144201A (en) * 1990-02-23 1992-09-01 Welch Allyn, Inc. Low watt metal halide lamp
DE102005016048B4 (en) * 2005-04-07 2018-11-29 Ledvance Gmbh Metal halide lamp with an ionizable filling containing at least one inert gas, mercury and metal halides of Tl, Na, Li, Dy, Ho and Tm

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GB1522035A (en) * 1976-11-11 1978-08-23 Gen Electric Co Ltd High pressure electric discharge lamps
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EP0092221A2 (en) * 1982-04-20 1983-10-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Low-power high-pressure discharge lamp

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AU604126B2 (en) * 1987-06-11 1990-12-06 Kabushiki Kaisha Toshiba High intensity discharge lamp of the one side sealed type capable of compensating for the change of luminous efficiency caused by its different lighting angles and manufacturing method of the same
EP0343625A2 (en) * 1988-05-27 1989-11-29 Toshiba Lighting & Technology Corporation Single end-sealed metal halide lamp
EP0343625A3 (en) * 1988-05-27 1991-04-24 Toshiba Lighting & Technology Corporation Single end-sealed metal halide lamp

Also Published As

Publication number Publication date
EP0220673A3 (en) 1989-05-10
JPS62100937A (en) 1987-05-11
US4782266A (en) 1988-11-01
JPH0522332B2 (en) 1993-03-29
EP0220673B1 (en) 1992-03-04
DE3537872A1 (en) 1987-04-30
DE3684091D1 (en) 1992-04-09

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