EP0722616B1 - Metal halogenide discharge lamp - Google Patents

Metal halogenide discharge lamp Download PDF

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Publication number
EP0722616B1
EP0722616B1 EP94919552A EP94919552A EP0722616B1 EP 0722616 B1 EP0722616 B1 EP 0722616B1 EP 94919552 A EP94919552 A EP 94919552A EP 94919552 A EP94919552 A EP 94919552A EP 0722616 B1 EP0722616 B1 EP 0722616B1
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EP
European Patent Office
Prior art keywords
discharge lamp
metal halide
outer bulb
metal
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.)
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EP94919552A
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German (de)
French (fr)
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EP0722616A1 (en
Inventor
Clemens Barthelmes
Andreas Dr. Hohlfeld
Jürgen Dr. VOM SCHEIDT
Dietrich Dr. Fromm
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/12Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/30Vessels; Containers
    • H01J61/34Double-wall vessels or containers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/36Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/82Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827Metal halide arc lamps

Definitions

  • the invention is based on a metal halide discharge lamp according to the preamble of the claim 1.
  • metal halide lamps primarily low power, especially about 50-250 W.
  • a rough guideline can be that the total amount (in mg) of metal halides can be limited to a maximum of three times the volume of the discharge vessel (in cm 3 ).
  • the condition for the filling quantity can be specified in such a way that the pure proportion of metals with a small ion radius (especially sodium) - which therefore tend to diffuse and are hereinafter referred to as "diff.
  • Metals - expressed in Micromol ( ⁇ mol) in the filling is less than six times the discharge volume, expressed in cubic centimeters (cm 3 ). Expressed as a formula, the following applies: specific diff. Metal content ⁇ 6 ⁇ mol / cm 3 .
  • Metal content is considered to be a value of the simple discharge volume (in cm 3 ), ie specific diff. Metal content ⁇ 1 ⁇ mol / cm 3 . Preferred values of the diff. Metal content are in the range of four times the discharge volume.
  • a small ion radius is understood to be a maximum of about 0.1 nm, such as that of Na + or Li + .
  • the invention is particularly for sodium rare earth filling systems suitable. Similar good results are achieved with Na Sc fillings.
  • the main area of application is lamps with Color temperatures in the order of 4000 K. (Light color neutral white), where the sodium content less than with warm white light colors (approx. 3000 K color temperature) can be selected.
  • the high-pressure discharge lamp 1 shown schematically in FIG. 1 with a power consumption of 70 W consists of an essentially cylindrical discharge vessel 2 made of quartz glass, which is bulged in the middle. It is closed at both ends with a pinch 3, through which the two current leads 4, 5 are inserted in a vacuum-tight manner by means of foils 6 and thereby establish an electrical connection to the electrodes 7 (made of thoriated tungsten) attached in the discharge vessel.
  • the ends of the discharge vessel are provided with a heat-reflecting coating 8.
  • the filling with the light color neutral white consists of the metals Hg and Na with additions of other rare earth metals and the halogens Br and / or I.
  • a preferred metal halide filling is 0.45 mg NaI, in each case 0.27 mg of the rare earth metal halides DyI 3 , HoI 3 and TmI 3 and 0.13 mg T1I.
  • the discharge volume is 0.7 cm 3 .
  • the discharge vessel 2 is located in a coaxially arranged cylindrical outer bulb 9 made of quartz glass, the smallest wall distance being only about 2-3 mm.
  • a getter 10 is arranged potential-free in this outer bulb and runs parallel to one of the current leads 4.
  • the outer bulb 9 is likewise closed at its two ends with a pinch, the electrical connection of the axially arranged power supply lines 4, 5 to the outside being effected in each case via a vacuum-tight foil pinch 11 and ceramic base parts 12 (with plate contacts).
  • the current leads 4, 5 hold the discharge vessel 2 in the outer bulb 9, one of the current leads 5 being provided with an expansion loop 13 to compensate for length tolerances.
  • the need for an expansion loop 13 depends on the dimensions of the lamp.
  • the two current leads 4, 5 are enclosed over their entire length in the outer bulb 9 by a stocking-like sleeve 14 made of quartz silk.
  • This material is temperature resistant up to 1200 ° C.
  • One example is the type SR 05 silicate hose from Lippmann (Schire / Germany).
  • This sleeve has 0.3 mm wall thickness and an inner diameter of 0.4 mm. It consists of more than 95% Si0 2 .
  • a ceramic fiber hose is also suitable for this or quartz fiber hose.
  • a tempered glass or quartz glass tube or a rigid ceramic sleeve In the case of straight power supplies, one can do less flexible material, e.g. a tempered glass or quartz glass tube or a rigid ceramic sleeve, be used.
  • a high temperature resistance is essential as well as sufficient UV absorption.
  • the invention is closed on all sides Discharge vessels that are closed on both sides Outer pistons are attached approximately axially, applicable.
  • the discharge vessel can in particular a quartz glass burner squeezed on both sides or be a ceramic tube closed on both sides.
  • the outer bulb is in particular a pinched on both sides Tempered glass or quartz glass pistons.
  • a ceramic suspension, for example ZrO 2, applied directly as a coating to the power supply is also particularly suitable as the sheathing.
  • This technology also has manufacturing advantages over separate sleeves and is also suitable for flexible power supplies.
  • the layer thickness is approximately 0.15 mm. To improve the adhesion, up to 15%, in particular 10% by weight of boron oxide is added.

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

Abstract

A metal halogenide discharge lamp (1) with a coaxial discharge vessel (2) and an outer tube (9) is filled with metals that tend to diffusion. Their specific content is less than 6 νmol/cm3. The current supply lines (4, 5) are surrounded over a large part of their length by an UV-absorbing sheath (14).

Description

Die Erfindung geht aus von einer Metallhalogenidentladungslampe gemäß dem Oberbegriff des Anspruchs 1.The invention is based on a metal halide discharge lamp according to the preamble of the claim 1.

Es handelt sich dabei um Metallhalogenidlampen vornehmlich kleiner Leistung, insbesondere etwa 50-250 W.These are metal halide lamps primarily low power, especially about 50-250 W.

Aus der DE-A 36 19 068 sind Metallhalogenidlampen bekannt, die ein zweiseitig gequetschtes Entladungsgefäß in einem zweiseitig gequetschten Kolben aufweisen. Zur Erhöhung der Betriebssicherheit, insbesondere am Lebensdauerende, ist die Stromzuführung von einer elektrisch-isolierenden Ummantelung umgeben. Dafür sind insbesondere Hülsen aus Keramik, Glas oder Quarzglas geeignet. Gleichzeitig wird darauf hingewiesen, daß sich die Bildung von Photoelektronen (s. z.B. DE-U 900 29 59) dadurch ausschließen läßt, daß Entladungsgefäß und Außenkolben so angeordnet werden, daß keine parallel zum Entladungsgefäß verlaufenden Gestellteile benötigt werden.
Bei Metallhalogenidlampen mit alkalimetallhaltiger Füllung, bei denen ein Leiter am Entladungsgefäß entlang geführt ist, wie dies bei einem zweiseitig gequetschten Entladungsgefäß in einem einseitig gequetschten Außenkolben der Fall ist, ist es bekannt, den am Entladungsgefäß entlanglaufenden Teil der Stromzuführung mit einer elektrisch-isolierenden und UV-undurchlässigen Abschirmung, insbesondere einem Röhrchen aus Glas, Keramik oder Quarzglas zu versehen (DE-A 16 39 084).
From DE-A 36 19 068 metal halide lamps are known which have a discharge vessel pinched on two sides in a bulb pinched on both sides. To increase operational safety, especially at the end of the service life, the power supply is surrounded by an electrically insulating jacket. Sleeves made of ceramic, glass or quartz glass are particularly suitable for this. At the same time, it is pointed out that the formation of photoelectrons (see, for example, DE-U 900 29 59) can be ruled out by arranging the discharge vessel and the outer bulb in such a way that no frame parts running parallel to the discharge vessel are required.
In the case of metal halide lamps with an alkali metal-containing filling, in which a conductor is guided along the discharge vessel, as is the case with a discharge vessel squeezed on two sides in an outer bulb squeezed on one side, it is known that the part of the power supply which runs along the discharge vessel is provided with an electrically insulating and UV to provide impermeable shielding, in particular a tube made of glass, ceramic or quartz glass (DE-A 16 39 084).

Es ist Aufgabe der Erfindung, das Betriebsverhalten von Metallhalogenidentladungslampen zu verbessern.It is an object of the invention, the operating behavior of metal halide discharge lamps.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Besonders vorteilhafte Ausgestaltungen finden sich in den Unteransprüchen.This task is characterized by the characteristics of claim 1 solved. Particularly advantageous Refinements can be found in the subclaims.

Überraschenderweise hat sich herausgestellt, daß die gezielte Verwendung einer Ummantelung, die für UV-Strahlung undurchlässig ist, für im Außenkolben befindliche Stromzuführungen unter bestimmten Umständen auch bei Metallhalogenidentladungslampen Vorteile bringt, die ein zweiseitig gequetschtes Entladungsgefäß in einem zweiseitig gequetschten Außenkolben besitzen, und die von daher nach bisher vorherrschender Meinung keine Probleme mit der Photoionisation aufweisen. Es handelt sich dabei um Metallhalogenidentladungslampen vornehmlich kleiner Leistung (typisch 50-250 W), die eine natrium-haltige Füllung besitzen. Es hat sich herausgestellt, daß hier die Verwendung einer UV-abschirmenden Ummantelung, die die Stromzuführungen im Außenkolben möglichst vollständig abdeckt, es gestattet, die Füllmengen an Metallhalogeniden, speziell der natriumhaltigen Komponente (z.B. NaI), sehr niedrig zu halten und trotzdem sehr lange Lebensdauern zu erzielen sind (ca. 6000 Betriebsstunden). Als grobe Richtschnur kann dienen, daß die Gesamtfüllmenge (in mg) an Metallhalogeniden maximal auf das Dreifache des Volumens des Entladungsgefäßes (in cm3) begrenzt werden kann.Surprisingly, it has been found that the specific use of a sheath which is impermeable to UV radiation for current leads located in the outer bulb also has advantages under certain circumstances with metal halide discharge lamps which have a bilaterally squeezed discharge vessel in a bilaterally squeezed outer bulb, and therefore according to the prevailing opinion, have no problems with photoionization. These are metal halide discharge lamps, primarily of low power (typically 50-250 W), which have a sodium-containing filling. It has been found that the use of a UV-shielding sheathing, which covers the power supply in the outer bulb as completely as possible, allows the amounts of metal halides, especially the sodium-containing component (e.g. NaI), to be kept very low and still have a very long service life can be achieved (approx. 6000 operating hours). A rough guideline can be that the total amount (in mg) of metal halides can be limited to a maximum of three times the volume of the discharge vessel (in cm 3 ).

Vorteilhaft ist, als Untergrenze eine Gesamtfüllmenge (in mg) an Metallhalogeniden anzusehen, die dem Einfachen des Entladungsvolumens (in cm3) entspricht. Der Grund ist, daß - vor allem bei Natrium-Seltenerd-Füllsystemen - der Restsauerstoff auf diese Weise zuverlässig absorbiert wird infolge der Getterwirkung der Füllkomponenten.It is advantageous to consider a total fill quantity (in mg) of metal halides as the lower limit, which corresponds to the simple one of the discharge volume (in cm 3 ). The reason is that - especially with sodium rare earth filling systems - the residual oxygen is reliably absorbed in this way due to the gettering effect of the filling components.

Bisherige Versuche mit Lampen derart geringer Dosierung haben jedoch eine vergleichsweise schlechte Maintenance ausgewiesen, weil nicht erkannt wurde, daß auch bei diesem Lampentyp eine geringfügige, jedoch über die Lampenlebensdauer durchaus merkliche Photoionisation auftritt, die zur Verarmung von Füllungskomponenten, insbesondere des Natriums, im Entladungsgefäß führt. Die Konsequenz war eine Absenkung des Partialdrucks dieser Füllungskomponente, insbesondere des Natriums, und eine Erhöhung der Brennspannung sowie eine unerwünschte Drift zu höheren Farbtemperaturen. Erfindungsgemäße Lampen zeigen jedoch eine sehr gute Maintenance ihres Lichtstroms über die Lebensdauer. Ähnliches gilt auch für die Farbtemperatur.Previous attempts with lamps so low Dosage however have a comparative bad maintenance reported because not it was recognized that even with this type of lamp marginal, but over the life of the lamp quite noticeable photoionization occurs for the depletion of filling components, in particular of sodium, leads in the discharge vessel. The consequence was a decrease in the partial pressure of this Filling component, especially sodium, and an increase in the burning voltage as well as an undesirable Drifts to higher color temperatures. According to the invention However, lamps show a very good one Maintenance of your luminous flux over the lifetime. The same applies to the color temperature.

Da die eigentliche Ursache der schlechten Maintenance in der Diffusion von Natriumionen oder auch anderer Metallionen mit geringem Ionenradius (z.B. Lithium) durch das Entladungsgefäß (im allgemeinen aus Quarzglas gefertigt; u.U. kann auch ein keramisches Entladungsgefäß verwendet werden, wie z.B. in der EP-A 536 609 beschrieben) liegt, läßt sich die Bedingung für die Füllmenge dahingehend spezifizieren, daß der reine Anteil an Metallen mit geringem Ionenradius (vor allem Natrium) - die daher zur Diffusion neigen und im folgenden als "Diff.-Metalle" bezeichnet werden - ausgedrückt in Mikromol (µmol) in der Füllung kleiner ist als das Sechsfache des Entladungsvolumens, ausgedrückt in Kubikzentimeter (cm3). Als Formel ausgedrückt gilt also: spezifischer Diff.-Metallgehalt ≤ 6 µmol/cm3.Since the actual cause of the poor maintenance in the diffusion of sodium ions or other metal ions with a small ion radius (e.g. lithium) through the discharge vessel (generally made of quartz glass; under certain circumstances a ceramic discharge vessel can also be used, as for example in EP-A 536 609), the condition for the filling quantity can be specified in such a way that the pure proportion of metals with a small ion radius (especially sodium) - which therefore tend to diffuse and are hereinafter referred to as "diff. Metals" - expressed in Micromol (µmol) in the filling is less than six times the discharge volume, expressed in cubic centimeters (cm 3 ). Expressed as a formula, the following applies: specific diff. Metal content ≤ 6 µmol / cm 3 .

Als Untergrenze des Diff.-Metallgehalts wird ein Wert vom Einfachen des Entladungsvolumens (in cm3) angesehen, d.h. spezifischer Diff.-Metallgehalt ≥ 1 µmol/cm3. Bevorzugte Werte des Diff.-Metallgehalts liegen im Bereich des Vierfachen des Entladungsvolumens.The lower limit of the diff. Metal content is considered to be a value of the simple discharge volume (in cm 3 ), ie specific diff. Metal content ≥ 1 µmol / cm 3 . Preferred values of the diff. Metal content are in the range of four times the discharge volume.

Unter geringem Ionenradius werden Werte von maximal etwa 0,1 nm verstanden, wie sie z.B. Na+ oder Li+ aufweisen.A small ion radius is understood to be a maximum of about 0.1 nm, such as that of Na + or Li + .

Die Erfindung ist insbesondere für Natrium-Seltenerd-Füllungssysteme geeignet. Ähnlich gute Ergebnisse werden bei Na Sc-Füllungen erzielt.The invention is particularly for sodium rare earth filling systems suitable. Similar good results are achieved with Na Sc fillings.

Hauptsächliches Anwendungsgebiet sind Lampen mit Farbtemperaturen in der Größenordnung von 4000 K (Lichtfarbe neutralweiß), bei denen der Natriumgehalt geringer als bei warmweißen Lichtfarben (ca. 3000 K Farbtemperatur) gewählt werden kann.The main area of application is lamps with Color temperatures in the order of 4000 K. (Light color neutral white), where the sodium content less than with warm white light colors (approx. 3000 K color temperature) can be selected.

Es bleibt anzumerken, daß die eingangs diskutierte Erhöhung der Betriebssicherheit nur bei den Lampen eine Rolle spielt, die einen evakuierten Außenkolben aufweisen, und bei denen Elektrode (aus Wolfram) und Stromzuführung (aus Molybdän) aus verschiedenen Materialien bestehen. Nur hier führt die Verwendung korrosionsfördernder Füllungen (damit sind vornehmlich Natrium-Zinn-Füllungen gemeint) zur Elektrodenkorrosion und damit zur Undichtigkeit des Entladungsgefäßes und schließlich zum letalen Gleichstrombetrieb. Dagegen können die erfindungsgemäßen Lampen sowohl einen evakuierten als auch mit Inertgas gefüllten Außenkolben (z.B. Stickstoff) aufweisen. Außerdem spielt die Materialfrage von Elektrode und Stromzuführung keine Rolle.It should be noted that the one discussed at the beginning Increased operational safety only with the lamps plays a role that an evacuated outer bulb and where electrode (made of tungsten) and power supply (made of molybdenum) from different Materials exist. It leads only here Use of corrosion-promoting fillings (with it are primarily sodium-tin fillings) for electrode corrosion and thus for leaks of the discharge vessel and finally to lethal DC operation. In contrast, the invention Lamps both an evacuated as well outer bulb filled with inert gas (e.g. nitrogen) exhibit. The material question also plays of electrode and power supply is irrelevant.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels näher erläutert. Es zeigt

Fig. 1
eine Lampe gemäß der Erfindung
Fig. 2
die Mortalitätskurve einer Gruppe erfindungsgemäßer Lampen sowie einer Vergleichsgruppe
The invention is explained in more detail below using an exemplary embodiment. It shows
Fig. 1
a lamp according to the invention
Fig. 2
the mortality curve of a group of lamps according to the invention and a comparison group

Die in Fig. 1 schematisch dargestellte Hochdruckentladungslampe 1 mit einer Leistungsaufnahme von 70 W besteht aus einem im wesentlichen zylindrischen Entladungsgefäß 2 aus Quarzglas, das in der Mitte bauchig ausgeweitet ist. Es ist an beiden Enden jeweils mit einer Quetschung 3 verschlossen, durch die die beiden Stromzuführungen 4,5 mittels Folien 6 vakuumdicht eingeführt sind und dabei eine elektrische Verbindung zu den im Entladungsgefäß angebrachten Elektroden 7 (aus thoriertem Wolfram) herstellen. Die Enden des Entladungsgefäßes sind mit einem wärmereflektierenden Belag 8 versehen. Die Füllung mit der Lichtfarbe Neutralweiß besteht aus den Metallen Hg und Na mit Zusätzen weiterer Metalle der Seltenen Erden und aus den Halogenen Br und/oder I. Eine bevorzugte Metallhalogenidfüllung ist 0,45 mg NaI, jeweils 0,27 mg der Seltenen Erdmetall-Halogenide DyI3, HoI3 und TmI3 sowie 0,13 mg T1I. Das Entladungsvolumen beträgt 0,7 cm3.The high-pressure discharge lamp 1 shown schematically in FIG. 1 with a power consumption of 70 W consists of an essentially cylindrical discharge vessel 2 made of quartz glass, which is bulged in the middle. It is closed at both ends with a pinch 3, through which the two current leads 4, 5 are inserted in a vacuum-tight manner by means of foils 6 and thereby establish an electrical connection to the electrodes 7 (made of thoriated tungsten) attached in the discharge vessel. The ends of the discharge vessel are provided with a heat-reflecting coating 8. The filling with the light color neutral white consists of the metals Hg and Na with additions of other rare earth metals and the halogens Br and / or I. A preferred metal halide filling is 0.45 mg NaI, in each case 0.27 mg of the rare earth metal halides DyI 3 , HoI 3 and TmI 3 and 0.13 mg T1I. The discharge volume is 0.7 cm 3 .

Das Entladungsgefäß 2 befindet sich in einem koaxial angeordneten zylindrischen Außenkolben 9 aus Quarzglas, wobei der kleinste Wandabstand nur etwa 2-3 mm beträgt. In diesem Außenkolben ist in bekannter Weise ein Getter 10 potentialfrei angeordnet, das parallel zu einer der Stromzuführungen 4 verläuft. Der Außenkolben 9 ist ebenfalls an seinen beiden Enden mit einer Quetschung verschlossen, wobei die elektrische Verbindung der axial angeordneten Stromzuführungen 4, 5 nach außen jeweils über eine vakuumdichte Folieneinquetschung 11 und keramische Sockelteile 12 (mit Plättchenkontakten) erfolgt. Die Stromzuführungen 4, 5 haltern das Entladungsgefäß 2 im Außenkolben 9, wobei zum Ausgleich von Längentoleranzen eine der Stromzuführungen 5 mit einer Dehnungsschleife 13 versehen ist. Die Notwendigkeit einer Dehnungsschleife 13 hängt von den Abmessungen der Lampe ab. Die beiden Stromzuführungen 4, 5 sind auf ihrer gesamten, im Außenkolben 9 verlaufenden Länge von einer strumpfartigen Hülse 14 aus Quarzseide umschlossen. Dieses Material ist temperaturbeständig bis 1200 °C. Ein Beispiel ist der Silikatschlauch Typ S-R 05 der Firma Lippmann (Schwerte/Deutschland). Diese Hülse hat 0,3 mm Wandstärke und einen Innendurchmesser von 0,4 mm. Sie besteht zu mehr als 95 % aus Si02.The discharge vessel 2 is located in a coaxially arranged cylindrical outer bulb 9 made of quartz glass, the smallest wall distance being only about 2-3 mm. In a known manner, a getter 10 is arranged potential-free in this outer bulb and runs parallel to one of the current leads 4. The outer bulb 9 is likewise closed at its two ends with a pinch, the electrical connection of the axially arranged power supply lines 4, 5 to the outside being effected in each case via a vacuum-tight foil pinch 11 and ceramic base parts 12 (with plate contacts). The current leads 4, 5 hold the discharge vessel 2 in the outer bulb 9, one of the current leads 5 being provided with an expansion loop 13 to compensate for length tolerances. The need for an expansion loop 13 depends on the dimensions of the lamp. The two current leads 4, 5 are enclosed over their entire length in the outer bulb 9 by a stocking-like sleeve 14 made of quartz silk. This material is temperature resistant up to 1200 ° C. One example is the type SR 05 silicate hose from Lippmann (Schwerte / Germany). This sleeve has 0.3 mm wall thickness and an inner diameter of 0.4 mm. It consists of more than 95% Si0 2 .

Dieses Material ist so flexibel, daß es auch problemlos die Biegung der Dehnungsschleife mitmacht. Hierfür eignet sich auch ein Keramikfaserschlauch oder Quarzfaserschlauch. This material is so flexible that it is also easy follows the bend of the expansion loop. A ceramic fiber hose is also suitable for this or quartz fiber hose.

Bei geraden Stromzuführungen kann auch ein weniger flexibles Material, z.B. ein Hartglas- oder Quarzglasröhrchen oder eine starre keramische Hülse, verwendet werden. Wesentlich ist eine hohe Temperaturbeständigkeit sowie eine ausreichende UV-Absorption.In the case of straight power supplies, one can do less flexible material, e.g. a tempered glass or quartz glass tube or a rigid ceramic sleeve, be used. A high temperature resistance is essential as well as sufficient UV absorption.

In Fig. 2 ist ein Vergleich zwischen der Lebensdauer der anhand von Fig. 1 beschriebenen Lampen ohne (kreuzförmige Meßpunkte) und mit (dreieckige Meßpunkte) Ummantelung der Stromzuführung gezeigt. Die Dosierung der Füllung war für beide Meßgruppen gleich. Wegen der niedrigen Dosierung der Füllung sinkt die Zahl der überlebenden Lampen, die keine Ummantelung aufweisen (Kurve a) nach 6000 Std. Betriebsdauer auf 39 %, während sie bei der Gruppe mit erfindungsgemäßer Ummantelung (Kurve b) in etwa noch doppelt so groß ist (ca. 75 %). Bis 3000 Betriebsstunden ist bei dieser Gruppe überhaupt kein Ausfall zu verzeichnen; eine 50 %-Ausfallrate wird erst nach 7500 Std. erreicht.2 is a comparison between the lifespan of the lamps described with reference to FIG. 1 without (cross-shaped measuring points) and with (triangular measuring points) Sheath of the power supply shown. The Dosage of the filling was for both measuring groups equal. Because of the low dosage of the filling the number of surviving lamps decreases, none Show sheathing (curve a) after 6000 hours Operating time at 39% while at the group with casing according to the invention (curve b) approximately is still twice as large (approx. 75%). Up to 3000 This group has operating hours at all no failure to report; a 50% failure rate is only reached after 7500 hours.

Die Erfindung ist auf alle zweiseitig verschlossenen Entladungsgefäße, die im zweiseitig verschlossenen Außenkolben in etwa axial angebracht sind, anwendbar. Das Entladungsgefäß kann insbesondere ein zweiseitig gequetschter Quarzglasbrenner oder ein zweiseitig verschlossenes Keramikrohr sein. Der Außenkolben ist insbesondere ein zweiseitig gequetschter Hartglas- oder Quarzglaskolben.The invention is closed on all sides Discharge vessels that are closed on both sides Outer pistons are attached approximately axially, applicable. The discharge vessel can in particular a quartz glass burner squeezed on both sides or be a ceramic tube closed on both sides. Of the The outer bulb is in particular a pinched on both sides Tempered glass or quartz glass pistons.

Als Ummantelung eignet sich insbesondere auch eine direkt als Beschichtung auf die Stromzuführung aufgetragene Keramiksuspension, beispielsweise ZrO2. Diese Technik hat insbesondere auch fertigungstechnische Vorteile gegenüber separaten Hülsen und ist ebenfalls für flexible Stromzuführungen geeignet. Die Schichtdicke beträgt etwa 0,15 mm. Um die Haftung zu verbessern, wird bis zu 15 %, insbesondere 10 Gew.-% Boroxid zugesetzt.A ceramic suspension, for example ZrO 2, applied directly as a coating to the power supply is also particularly suitable as the sheathing. This technology also has manufacturing advantages over separate sleeves and is also suitable for flexible power supplies. The layer thickness is approximately 0.15 mm. To improve the adhesion, up to 15%, in particular 10% by weight of boron oxide is added.

Claims (9)

  1. Metal halide discharge lamp having a discharge vessel (2) which is closed at both ends and contains two electrodes and a filling having metals which tend to diffuse in transparent quartz or ceramic at temperatures of up to 1200°C and which during operation form ions having a small ion radius, the ion radius corresponding at most to that of the ion Na+, and which vessel is surrounded by a cylindrical outer bulb (9) which is sealed at both ends and defines an axis, the discharge vessel (2) being arranged approximately axially in the outer bulb (9) and held there by means of two leading-in cables (4, 5) arranged in the outer bulb (9), the leading-in cables (4, 5) arranged in the outer bulb (9) being surrounded over a large part of their length by a UV-screening jacket (14), characterized in that the specific content of the metals which tend to diffuse in the discharge volume is less than 6 µmol/cm3.
  2. Metal halide discharge lamp according to Claim 1, characterized in that the metal which tends to diffuse is sodium and/or lithium.
  3. Metal halide discharge lamp according to Claim 1 or 2, characterized in that the specific content of metal which tends to diffuse is at least 1 µmol/cm3.
  4. Metal halide discharge lamp according to Claim 1, characterized in that the jacket (14) is produced from one of the materials ceramic, hard glass or transparent quartz.
  5. Metal halide discharge lamp according to Claim 4, characterized in that the jacket (14) is flexible.
  6. Metal halide discharge lamp according to Claim 1, characterized in that the total filling of metal halides (in mg) corresponds at most to three times the volume (in cm3) of the discharge vessel.
  7. Metal halide discharge lamp according to Claim 1, characterized in that the lamp performance is at most 250 W.
  8. Metal halide discharge lamp according to Claim 1, characterized in that the jacket is a coating of a ceramic suspension, in particular of ZrO2, which contains up to 15 % by weight of boron oxide.
  9. Use of a jacket (14), in particular a sleeve made from transparent quartz, hard glass or ceramic material, for the leading-in cables (4, 5) in the outer bulb of a metal halide discharge lamp, in which a discharge vessel (2) pinched at both ends is arranged approximately axially in a cylindrical outer bulb (9), which is sealed at both ends and defines an axis, for the purpose of avoiding photoionization during use of small amounts of metal fillings of the metals sodium and/or lithium, characterized in that the pure amount of these metals is less than 6 µmol/cm3, relative to the discharge volume.
EP94919552A 1993-10-06 1994-06-30 Metal halogenide discharge lamp Expired - Lifetime EP0722616B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4334074 1993-10-06
DE4334074A DE4334074A1 (en) 1993-10-06 1993-10-06 Metal halide discharge lamp
PCT/DE1994/000753 WO1995010120A1 (en) 1993-10-06 1994-06-30 Metal halogenide discharge lamp

Publications (2)

Publication Number Publication Date
EP0722616A1 EP0722616A1 (en) 1996-07-24
EP0722616B1 true EP0722616B1 (en) 1999-09-08

Family

ID=6499548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94919552A Expired - Lifetime EP0722616B1 (en) 1993-10-06 1994-06-30 Metal halogenide discharge lamp

Country Status (7)

Country Link
US (1) US5729091A (en)
EP (1) EP0722616B1 (en)
JP (1) JP3176631B2 (en)
CN (1) CN1066853C (en)
DE (2) DE4334074A1 (en)
HU (1) HU216672B (en)
WO (1) WO1995010120A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19731168A1 (en) * 1997-07-21 1999-01-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Illumination system
US6147440A (en) * 1997-09-11 2000-11-14 Osram Sylvania Inc. Low wattage lamp having formed arc tube in aluminosilicate outer jacket
JP3657461B2 (en) * 1999-06-15 2005-06-08 株式会社小糸製作所 Discharge bulb
JP4050062B2 (en) * 2001-04-02 2008-02-20 サムスン エレクトロニクス カンパニー リミテッド Light source device, backlight assembly having the same, and liquid crystal display device
US6861808B2 (en) * 2002-03-27 2005-03-01 Matsushita Electric Industrial Co., Ltd. Metal vapor discharge lamp
DE10234758B4 (en) * 2002-07-30 2006-02-16 Sli Lichtsysteme Gmbh Low power metal halide lamp
SE0701251L (en) * 2007-05-24 2008-09-09 Auralight Int Ab High-pressure sodium lamp
CN102205136B (en) * 2010-03-31 2014-02-05 海尔集团公司 Broadband light-wave sterilizing lamp

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6703447A (en) * 1967-03-03 1968-09-04
DE3619068C2 (en) * 1986-06-06 1996-08-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Compact metal halide discharge lamp
HU205485B (en) * 1986-10-20 1992-04-28 Tungsram Reszvenytarsasag Metal halogen discharge lamp containing alkali-halogenide additive
DE9002959U1 (en) * 1990-03-15 1990-05-17 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
US5064395A (en) * 1990-10-01 1991-11-12 Gte Products Corporation Compact outer jacket for low wattage discharge lamp
CA2062889A1 (en) * 1991-04-22 1992-10-23 John M. Washick Silicon nitride coatings in metal halide lamps to reduce sodium loss
DE9112690U1 (en) * 1991-10-11 1991-12-05 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De
JPH0631029U (en) * 1992-09-22 1994-04-22 住友電装株式会社 Protective structure at the end of the shielded wire

Also Published As

Publication number Publication date
CN1132569A (en) 1996-10-02
EP0722616A1 (en) 1996-07-24
JPH08511127A (en) 1996-11-19
US5729091A (en) 1998-03-17
HUT73122A (en) 1996-06-28
DE4334074A1 (en) 1995-04-13
HU216672B (en) 1999-08-30
JP3176631B2 (en) 2001-06-18
HU9503684D0 (en) 1996-02-28
WO1995010120A1 (en) 1995-04-13
DE59408733D1 (en) 1999-10-14
CN1066853C (en) 2001-06-06

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