EP1482534B1 - Lighting device comprising a gas discharge lamp and a protective sleeve - Google Patents

Lighting device comprising a gas discharge lamp and a protective sleeve Download PDF

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Publication number
EP1482534B1
EP1482534B1 EP04009233.0A EP04009233A EP1482534B1 EP 1482534 B1 EP1482534 B1 EP 1482534B1 EP 04009233 A EP04009233 A EP 04009233A EP 1482534 B1 EP1482534 B1 EP 1482534B1
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EP
European Patent Office
Prior art keywords
lamp
shielding sleeve
gas discharge
lighting arrangement
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04009233.0A
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German (de)
French (fr)
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EP1482534A2 (en
EP1482534A3 (en
Inventor
Wolfgang Mmag. Bechter
Christoph Mag. Mathis
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ZUMTOBEL LIGHTING GmbH
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Zumtobel Lighting GmbH Austria
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Publication of EP1482534A3 publication Critical patent/EP1482534A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury

Definitions

  • the present invention relates to a lighting arrangement which consists of an elongated gas discharge lamp and a shielding sleeve provided for the gas discharge lamp.
  • the present invention relates to a shielding sleeve for a low-pressure discharge lamp.
  • the temperature of the lamps must be within a predetermined range.
  • the so-called T16 lamps which are named after the fact that their tube has a diameter of 16mm, the optimum temperature range is 40-44 ° C.
  • T16 lamps mentioned above unlike the likewise known T26 lamps with a broader lamp diameter, have different lengths of feed lines to the lamp electrodes.
  • This asymmetric configuration of a T16 lamp with regard to its electrodes means that in these lamps the cool spot comes to rest at the end at which the longer electrode feed line is placed, or at which the distance of the electrode to the front end of the lamp is greater ,
  • the cool spot in the symmetrically designed T26 lamps is always in the middle of the lamp.
  • T16 lamps are more temperature sensitive than T26 lamps.
  • fluorescent lamps in particular the above-mentioned T16 lamps used in air conditioning lights, ie in lights that have supply or exhaust openings in the lamp housing, which are connected to an air conditioner, so the constantly existing draft causes these lamps cool down, ie the cool spot has a temperature that is well below 40 ° C.
  • the lamp cools down to such an extent that a temperature well below 40 ° C is present at the Cool Spot.
  • this cooling has the consequence that the efficiency of the lamp is no longer optimal.
  • a luminaire for fluorescent lamps with a protective tube in which a heat compensation sleeve made of copper is mounted in the region of the lamp electrodes.
  • the US 4,629,929 describes a quartz glass sleeve which is intended to radiate heat radiation back into the electrode region of a discharge lamp.
  • the present invention is therefore based on the object to improve the known shielding tubes for fluorescent lamps so that with them even at low ambient temperatures of the cool spot are kept in an optimal temperature range and thus the lamp can achieve a sufficiently high luminous flux.
  • the object is achieved by a lighting arrangement according to claims 1 or 2 or by a shielding sleeve for use in a gas discharge lamp according to one of the two claims 13 and 14.
  • the shielding sleeve in such a way that it at least partially has a layer of a good heat-conductive material whose thermal conductivity is greater than or equal to 30 W / mK.
  • the shielding sleeve at least partially has a reflective layer.
  • the shielding sleeve is designed such that it has both properties - ie both a good thermal conductivity and the ability to reflect electromagnetic radiation - which can be achieved, for example, by the shielding sleeve having at least partially a corresponding metal or aluminum layer.
  • both of the above-mentioned properties contribute to an optimized temperature shielding of the lamp compared to the one described above Environment.
  • the reflective property of the shielding sleeve causes the heat generated at the lamp filament or lamp electrode, which is emitted as heat radiation, to be reflected back again and thus fed back to the lamp.
  • a high thermal conductivity shielding sleeve helps to increase the temperature in the adjacent area of the lamp's cool spot to the area of the cool spot. In other words, the shielding sleeve itself is heated and transfers this heat in a desired manner to the lamp in the area of the cool spot.
  • the shielding sleeve should thus have a high thermal conductivity, which should be at least in the range of the heat conductivity of metals.
  • the thermal conductivity of lead is called, which is about 35 W / mK.
  • the material used should therefore have a thermal conductivity of greater than or equal to 30 W / mK.
  • the preferably used aluminum even has a conductivity of 220 W / mK.
  • the sleeve consists of a - preferably transparent - existing plastic base body, which is at least over a part of its length or even over the entire length of time covered with a layer of a reflective and / or thermally conductive material.
  • a reflective and / or thermally conductive material there is also the possibility (not claimed) of forming the shielding sleeve completely from the thermally conductive and / or reflective material.
  • Optimal results were obtained with an aluminum sleeve, which has a wall thickness of about 1mm and - depending on the ambient temperature - about 35-50mm long.
  • the shielding sleeve obtained in this way is then arranged at the front end of the gas discharge lamp, on which the cool spot is located. As already mentioned, in the T16 lamps this is the end where the lamp electrode with the longer electrical leads is located.
  • the shielding sleeve can be arranged such that it surrounds the electrical leads, but not the lamp electrode itself. As a result, despite the - when using metal - opaque shielding a sufficiently high luminous flux is achieved. At particularly low ambient temperatures, however, sleeves can also be used, which completely surround the electrode due to their length.
  • the shielding sleeve according to the invention is preferably intended for use with low-pressure discharge lamps, in particular for use in the T16 lamps described above.
  • the in the Fig. 1a and 1b Lighting arrangement shown consists of a cylinder-like elongated gas discharge lamp 1 and a pushed onto a front end of the lamp 1 shielding 10.
  • the illustrated lamp 1 is a low-pressure discharge lamp, in particular a T16 lamp whose lamp body 4 has a diameter of 16 mm.
  • a particular feature of the illustrated T16 lamp 1 is that the electrical leads 3a and 3b are of different lengths for the two lamp electrodes 2a and 2b.
  • the lead 3a is longer for the lamp electrode 2a arranged on the left side, with the result that the electrode 2a is farther away from the corresponding front end of the lamp 1 than the electrode 2b.
  • the cool spot of the lamp 1 that is to say the region at which the lamp 1 has its lowest temperature during normal operation, is arranged at the left end of the lamp 1.
  • the shielding sleeve 10 In order to prevent cooling of the lamp 1 in the region of the cool spot to a temperature below 40 ° C., in particular at low ambient temperatures, the shielding sleeve 10 according to the invention is pushed onto the left front end of the lamp 1.
  • the shielding sleeve 10 is made entirely of aluminum.
  • the shielding sleeve 10 is so in relation to the Lamp 1 is arranged so that it surrounds the leads 3a for the lamp electrode 2a, but not the electrode 2a itself. This ensures that the output from the lamp 1 luminous flux is not affected by the opaque aluminum.
  • the aluminum surrounding the electrical leads 3a of the shielding sleeve 10 has the consequence that the heat generated at the electrode 2a is reflected and the lamp 1 is additionally heated in the forehead area. This ensures that the lamp 1 can be operated even at ambient temperatures below 25 ° C even at optimum temperatures.
  • the left end of the lamp 1, where the cool spot is located, is thus heated by the shielding sleeve 10 so far that it can be maintained in the required for optimum lamp operation temperature range of 40-44 ° C despite the low ambient temperatures.
  • the length of the shielding sleeve 10 determines the degree of achievable temperature increase. There is thus the possibility, by selecting the length of the shielding sleeve 10, to set different ambient temperature ranges at which the shielding sleeve 10 achieves the suitable effects. In other words, different lengths of shielding sleeves 10 can be provided, each sleeve being optimal for a different ambient temperature range.
  • a shielding sleeve 10 made of aluminum has a length of about 35-50 mm, wherein the area which is pushed over the base, about 10mm long and the area surrounding the glass bulb 4 about 25-40mm, in particular 30-35 mm long.
  • the wall thickness of the glass piston 4 enclosing portion of the sleeve 10 is between 0.5mm and 2mm, preferably at about 1mm. It has been found that with an aluminum sleeve, which has a wall thickness of 1 mm and a total length of 40 mm, the temperature at which the lamp can be operated under optimum conditions can be reduced by about 15 °.
  • FIGS. 2 and 3 show the shielding sleeve 10 in a side view or in front view. This points - as in Fig. 2 is shown - one of the shape of the lamp corresponding inner contour, so that it can be placed in register on the front end of the lamp.
  • the shielding sleeve 10 in the present case is made entirely of aluminum, since contrary to the original assumption that such an aluminum sleeve has a cooling effect, it has surprisingly been found that even very good results are achieved with a shielding sleeve made entirely of aluminum can. This is attributed to the fact that the aluminum sleeve not only reflects back the heat generated at the lamp electrode, but additionally heats up and transfers the heat in the desired manner to the lamp in the area of the cool spot.
  • the shielding sleeve is formed from a base body made of - preferably transparent - plastic, the inside of which is coated with an aluminum layer or with another layer of a material which has a high thermal conductivity of at least 30 W / mK and has a reflective effect.
  • a base body made of - preferably transparent - plastic, the inside of which is coated with an aluminum layer or with another layer of a material which has a high thermal conductivity of at least 30 W / mK and has a reflective effect.
  • the present invention thus provides a simple possibility to prevent cooling of a gas discharge lamp, in particular a low-pressure discharge lamp.
  • the temperature shield by the shielding according to the invention is even so good that T16 lamps can be operated even at very low ambient temperatures below 25 ° C even at optimum temperatures.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Description

Die vorliegende Erfindung betrifft eine Beleuchtungsanordnung, die aus einer länglichen Gasentladungslampe sowie einer für die Gasentladungslampe vorgesehenen Abschirmhülse besteht. Insbesondere betrifft die vorliegende Erfindung eine Abschirmhülse für eine Niederdruckentladungslampe.The present invention relates to a lighting arrangement which consists of an elongated gas discharge lamp and a shielding sleeve provided for the gas discharge lamp. In particular, the present invention relates to a shielding sleeve for a low-pressure discharge lamp.

Die Arbeitsweise einer Leuchtstofflampe bedingt, dass diese nicht über die gesamte Länge des Lampenkörpers hinweg gleich warm ist. Aufgrund der physikalischen Vorgänge während des Lampenbetriebs ergibt sich ein definierter Ort, an dem die Lampe während des Normalbetriebs ihre niedrigste Temperatur aufweist. Dieser Ort wird im allgemeinen als sog. Cool Spot bezeichnet.The operation of a fluorescent lamp requires that this is not the same time over the entire length of the lamp body away. Due to the physical processes during lamp operation, a defined location results where the lamp has its lowest temperature during normal operation. This place is commonly referred to as a so-called cool spot.

Um Gasentladungslampen optimal betreiben zu können, d. h., während des Betriebs einen guten Wirkungsgrad zu erzielen, muss die Temperatur der Lampen innerhalb eines vorgegebenen Bereichs liegen. Bei den sog. T16-Lampen, die ihren Namen aufgrund der Tatsache erhalten, dass deren Röhre einen Durchmesser von 16mm aufweist, liegt der optimale Temperaturbereich bei 40-44°C.To operate gas discharge lamps optimally, d. h., to achieve good efficiency during operation, the temperature of the lamps must be within a predetermined range. The so-called T16 lamps, which are named after the fact that their tube has a diameter of 16mm, the optimum temperature range is 40-44 ° C.

Die oben genannten T16-Lampen weisen im Gegensatz zu den ebenfalls bekannten T26-Lampen mit einem breiteren Lampendurchmesser verschieden lange Zuführungsleitungen zu den Lampenelektroden auf. Diese asymmetrische Ausgestaltung einer T16-Lampe hinsichtlich ihrer Elektroden führt dazu, dass bei diesen Lampen der Cool Spot an dem Ende zu liegen kommt, an dem die längere Elektrodenzuleitung platziert ist, bzw. an dem der Abstand der Elektrode zu dem Stirnende der Lampe größer ist. Im Gegensatz dazu liegt der Cool Spot bei den symmetrisch ausgestalteten T26-Lampen immer in der Lampenmitte. Eine Folge hiervon ist, dass T16-Lampen temperaturempfindlicher sind als T26-Lampen.The T16 lamps mentioned above, unlike the likewise known T26 lamps with a broader lamp diameter, have different lengths of feed lines to the lamp electrodes. This asymmetric configuration of a T16 lamp with regard to its electrodes means that in these lamps the cool spot comes to rest at the end at which the longer electrode feed line is placed, or at which the distance of the electrode to the front end of the lamp is greater , In contrast, the cool spot in the symmetrically designed T26 lamps is always in the middle of the lamp. One consequence of this is that T16 lamps are more temperature sensitive than T26 lamps.

Werden Leuchtstofflampen, insbesondere die oben angesprochenen T16-Lampen in Klimaleuchten verwendet, also in Leuchten, die Zu- oder Abluftöffnungen im Leuchtengehäuse aufweisen, welche mit einer Klimaanlage verbunden sind, so führt der ständig vorhandene Luftzug dazu, dass diese Lampen auskühlen, d. h., das der Cool Spot eine Temperatur aufweist, die deutlich unterhalb von 40°C liegt. Ein ähnlicher Effekt ergibt sich, wenn Leuchten mit T16-Lampen bei sehr niedrigen Umgebungstemperaturen eingesetzt werden. Auch hier kühlt die Lampe soweit ab, dass an dem Cool Spot eine Temperatur deutlich unterhalb von 40°C vorliegt. Diese Abkühlung hat allerdings zur Folge, dass der Wirkungsgrad der Lampe nicht mehr optimal ist.If fluorescent lamps, in particular the above-mentioned T16 lamps used in air conditioning lights, ie in lights that have supply or exhaust openings in the lamp housing, which are connected to an air conditioner, so the constantly existing draft causes these lamps cool down, ie the cool spot has a temperature that is well below 40 ° C. A similar effect arises when lamps with T16 lamps at very low Ambient temperatures are used. Here as well, the lamp cools down to such an extent that a temperature well below 40 ° C is present at the Cool Spot. However, this cooling has the consequence that the efficiency of the lamp is no longer optimal.

Um die oben genannten Probleme zu umgehen, ist es bei Klimaleuchten bekannt, Kunststoffhülsen einseitig über dasjenige Ende der Lampe aufzuschieben, an dem sich der Cool Spot befindet. Bei Klimaleuchten kann hierdurch zwar das Abkühlen der Leuchte verhindert werden, die damit erzielbare Temperaturabschirmung ist jedoch bei Leuchten, die allgemein niedrigen Temperaturen ausgesetzt sind, nicht ausreichend. Ein weiterer Nachteil der bekannten Kunststoffhülsen besteht ferner darin, dass diese dazu neigen, abzubrennen.In order to avoid the above problems, it is known in air conditioning lights, one-sided push plastic sleeves on that end of the lamp on which the cool spot is located. Although the cooling of the luminaire can be prevented in the case of climate luminaires, the temperature shield which can be achieved thereby is not sufficient for luminaires which are generally exposed to low temperatures. Another disadvantage of the known plastic sleeves is that they tend to burn off.

Aus der US 6,359,376 B1 ist eine Leuchtstofflampe mit einem Entladungsrohr bekannt, bei der im Bereich einer Elektrode außen auf dem Entladungsrohr eine Hülse aus einer Kupfer-Aluminium-Folie angebracht ist.From the US 6,359,376 B1 is a fluorescent lamp with a discharge tube is known in which in the region of an electrode on the outside of the discharge tube, a sleeve made of a copper-aluminum foil is attached.

Aus der DE 31 12 962 A1 ist eine Leuchte für Leuchtstofflampen mit einem Schutzrohr bekannt, bei der im Bereich der Lampenelektroden eine Wärmeausgleichshülse aus Kupfer angebracht ist.From the DE 31 12 962 A1 a luminaire for fluorescent lamps with a protective tube is known, in which a heat compensation sleeve made of copper is mounted in the region of the lamp electrodes.

Aus der US 6,242,851 B1 ist eine Metalldampflampe mit einem metallenen Wärmeschild bekannt.From the US 6,242,851 B1 is a metal vapor lamp with a metal heat shield known.

Die US 4,629,929 beschreibt eine Quarzglas-Hülse, die Wärmestrahlung in den Elektrodenbereich einer Entladungslampe zurückstrahlen soll.The US 4,629,929 describes a quartz glass sleeve which is intended to radiate heat radiation back into the electrode region of a discharge lamp.

Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, die bekannten Abschirmhülsen für Leuchtstofflampen so zu verbessern, dass mit ihnen auch bei niedrigen Umgebungstemperaturen der Cool Spot in einem optimalen Temperaturbereich gehalten werden und damit die Lampe einen ausreichend hohen Lichtstrom erzielen kann.The present invention is therefore based on the object to improve the known shielding tubes for fluorescent lamps so that with them even at low ambient temperatures of the cool spot are kept in an optimal temperature range and thus the lamp can achieve a sufficiently high luminous flux.

Die Aufgabe wird durch eine Beleuchtungsanordnung gemäß den Ansprüchen 1 oder 2 bzw. durch eine Abschirmhülse zur Verwendung bei einer Gasentladungslampe gemäß einem der beiden Ansprüche 13 und 14 gelöst.The object is achieved by a lighting arrangement according to claims 1 or 2 or by a shielding sleeve for use in a gas discharge lamp according to one of the two claims 13 and 14.

Gemäss einem ersten Aspekt der vorliegenden Erfindung wird vorgeschlagen, die Abschirmhülse derart auszugestalten, dass sie zumindest teilweise eine Schicht aus einem gut wärmeleitfahigen Material aufweist, dessen Wärmeleitfähigkeit größer oder gleich 30 W/mK ist. Gemäß einem zweiten erfindungsgemäßen Aspekt hingegen weist die Abschirmhülse zumindest teilweise eine reflektierende Schicht auf.According to a first aspect of the present invention, it is proposed to design the shielding sleeve in such a way that it at least partially has a layer of a good heat-conductive material whose thermal conductivity is greater than or equal to 30 W / mK. In contrast, according to a second aspect of the invention, the shielding sleeve at least partially has a reflective layer.

Vorzugsweise ist die Abschirmhülse derart ausgestaltet, dass sie beide Eigenschaften - also sowohl eine gute Wärmeleitfähigkeit als auch die Fähigkeit zur Reflexion elektromagnetischer Strahlung - aufweist, was beispielsweise dadurch erreicht werden kann, dass die Abschirmhülse zumindest teilweise eine entsprechende Metall- bzw. Aluminiumschicht aufweist.Preferably, the shielding sleeve is designed such that it has both properties - ie both a good thermal conductivity and the ability to reflect electromagnetic radiation - which can be achieved, for example, by the shielding sleeve having at least partially a corresponding metal or aluminum layer.

Überraschenderweise hat sich gezeigt, dass beide oben genannten Eigenschaften dazu beitragen, eine optimierte Temperaturabschirmung der Lampe gegenüber der Umgebung zu erzielen. Dabei bewirkt die reflektierende Eigenschaft der Abschirmhülse, dass die an der Lampenwendel bzw. Lampenelektrode erzeugte Wärme, die als Wärmestrahlung abgegeben wird, wieder zurückreflektiert und damit der Lampe wieder zugeführt wird. Darüber hinaus wird vermutet, dass eine Abschirmhülse mit hoher Wärmeleitfähigkeit dazu beiträgt, die im benachbarten Bereich des Cool Spots der Lampe höhere Temperatur auf den Bereich des Cool Spots zu übertragen. Mit anderen Worten, die Abschirmhülse selbst wird erwärmt und leitet diese Wärme in gewünschter Weise auf die Lampe in dem Bereich des Cool Spots über.Surprisingly, it has been found that both of the above-mentioned properties contribute to an optimized temperature shielding of the lamp compared to the one described above Environment. In this case, the reflective property of the shielding sleeve causes the heat generated at the lamp filament or lamp electrode, which is emitted as heat radiation, to be reflected back again and thus fed back to the lamp. In addition, it is believed that a high thermal conductivity shielding sleeve helps to increase the temperature in the adjacent area of the lamp's cool spot to the area of the cool spot. In other words, the shielding sleeve itself is heated and transfers this heat in a desired manner to the lamp in the area of the cool spot.

Um den oben beschriebenen zweiten Effekt des Temperaturausgleichs nutzen zu können, sollte somit die Abschirmhülse eine hohe Wärmeleitfähigkeit aufweisen, wobei diese zumindest in dem Bereich der Wärmeleitfeitfähigkeit von Metallen liegen sollte. Als Anhaltspunkt hierfür sei die Wärmeleitfähigkeit von Blei genannt, die bei ca. 35 W/mK liegt. Das verwendet Material sollte daher eine Wärmeleitfähigkeit von größer oder gleich 30 W/mK aufweisen. Das bevorzugt verwendete Aluminium weist sogar eine Leitfähigkeit von 220 W/mK auf.In order to be able to use the above-described second effect of the temperature compensation, the shielding sleeve should thus have a high thermal conductivity, which should be at least in the range of the heat conductivity of metals. As an indication of this, the thermal conductivity of lead is called, which is about 35 W / mK. The material used should therefore have a thermal conductivity of greater than or equal to 30 W / mK. The preferably used aluminum even has a conductivity of 220 W / mK.

Erfindungsgemäß besteht die Hülse aus einem aus - vorzugsweise transparenten - Kunststoff bestehenden Grundkörper, der zumindest über einen Teil seiner Länge hinweg oder sogar über die gesamte Länge hinweg mit einer Schicht aus einem reflektierenden und/oder wärmeleitenden Material überzogen ist. Daneben besteht allerdings auch die (nicht beanspruchte) Möglichkeit, die Abschirmhülse vollständig aus dem wärmeleitfähigen und/oder reflektierenden Material zu bilden. Optimale Ergebnisse wurden mit einer Aluminiumhülse erhalten, welche eine Wandstärke von ca. 1mm aufweist und - je nach Umgebungstemperatur - ca. 35-50mm lang ist.According to the invention, the sleeve consists of a - preferably transparent - existing plastic base body, which is at least over a part of its length or even over the entire length of time covered with a layer of a reflective and / or thermally conductive material. However, there is also the possibility (not claimed) of forming the shielding sleeve completely from the thermally conductive and / or reflective material. Optimal results were obtained with an aluminum sleeve, which has a wall thickness of about 1mm and - depending on the ambient temperature - about 35-50mm long.

Die auf diese Weise erhaltene Abschirmhülse wird dann an dem Stirnende der Gasentladungslampe angeordnet, an dem sich der Cool Spot befindet. Wie bereits erwähnt wurde, ist dies bei den T16-Lampen dasjenige Ende, an dem sich die Lampenelektrode mit den längeren elektrischen Zuleitungen befindet. Die Abschirmhülse kann dabei derart angeordnet werden, dass sie zwar die elektrischen Zuleitungen, nicht jedoch die Lampenelektrode selbst umgibt. Hierdurch wird trotz der - bei Verwendung von Metall - lichtundurchlässigen Abschirmhülse ein ausreichend hoher Lichtstrom erzielt. Bei besonders niedrigen Umgebungstemperaturen können allerdings auch Hülsen zum Einsatz kommen, welche aufgrund ihrer Länge die Elektrode vollständig umgeben.The shielding sleeve obtained in this way is then arranged at the front end of the gas discharge lamp, on which the cool spot is located. As already mentioned, in the T16 lamps this is the end where the lamp electrode with the longer electrical leads is located. The shielding sleeve can be arranged such that it surrounds the electrical leads, but not the lamp electrode itself. As a result, despite the - when using metal - opaque shielding a sufficiently high luminous flux is achieved. At particularly low ambient temperatures, however, sleeves can also be used, which completely surround the electrode due to their length.

Die erfindungsgemäße Abschirmhülse ist vorzugsweise zur Verwendung mit Niederdruckentladungslampen vorgesehen, insbesondere zur Verwendung bei den oben beschriebenen T16-Lampen.The shielding sleeve according to the invention is preferably intended for use with low-pressure discharge lamps, in particular for use in the T16 lamps described above.

Nachfolgend soll die Erfindung anhand der beiliegenden Zeichnung näher erläutert werden. Es zeigen:

Fig. 1a
eine erfindungsgemäße Beleuchtungsanordnung bestehend aus einer länglichen Gasentladungslampe mit einer erfindungsgemäßen Abschirmhülse in seitlicher Ansicht;
Fig. 1b
die in Fig. 1a dargestellte Beleuchtungsanordnung im Schnitt;
Fig. 2
eine Abschirmhülse gemäß der vorliegenden Erfindung in seitlicher Ansicht; und
Fig. 3
eine Stirnansicht der in Fig. 2 dargestellten Abschirmhülse.
The invention will be explained in more detail with reference to the accompanying drawings. Show it:
Fig. 1a
a lighting arrangement according to the invention consisting of an elongated gas discharge lamp with a shielding sleeve according to the invention in a lateral view;
Fig. 1b
in the Fig. 1a illustrated lighting arrangement in section;
Fig. 2
a shielding sleeve according to the present invention in a side view; and
Fig. 3
an end view of in Fig. 2 Shielding sleeve shown.

Die in den Fig. 1a und 1b dargestellte Beleuchtungsanordnung besteht aus einer zylinderartigen länglichen Gasentladungslampe 1 sowie einer auf ein Stirnende der Lampe 1 aufgeschobenen Abschirmhülse 10. Bei der dargestellten Lampe 1 handelt es sich um eine Niederdruckentladungslampe, insbesondere um eine T16-Lampe, deren Lampenkörper 4 einen Durchmesser von 16 mm aufweist.The in the Fig. 1a and 1b Lighting arrangement shown consists of a cylinder-like elongated gas discharge lamp 1 and a pushed onto a front end of the lamp 1 shielding 10. The illustrated lamp 1 is a low-pressure discharge lamp, in particular a T16 lamp whose lamp body 4 has a diameter of 16 mm.

Ein besonderes Merkmal der dargestellten T16-Lampe 1 ist, dass die elektrischen Zuleitungen 3a und 3b für die beiden Lampenelektroden 2a und 2b unterschiedlich lang sind. Im dargestellten Ausführungsbeispiel ist die Zuleitung 3a für die auf der linken Seite angeordnete Lampenelektrode 2a länger, was zur Folge hat, dass sich die Elektrode 2a weiter entfernt von dem entsprechenden Stirnende der Lampe 1 befindet als die Elektrode 2b. Als Folge davon ist der Cool Spot der Lampe 1, also derjenige Bereich, an dem die Lampe 1 im Normalbetrieb ihre niedrigste Temperatur aufweist, am linken Ende der Lampe 1 angeordnet.A particular feature of the illustrated T16 lamp 1 is that the electrical leads 3a and 3b are of different lengths for the two lamp electrodes 2a and 2b. In the illustrated embodiment, the lead 3a is longer for the lamp electrode 2a arranged on the left side, with the result that the electrode 2a is farther away from the corresponding front end of the lamp 1 than the electrode 2b. As a result, the cool spot of the lamp 1, that is to say the region at which the lamp 1 has its lowest temperature during normal operation, is arranged at the left end of the lamp 1.

Um insbesondere bei niedrigen Umgebungstemperaturen ein Abkühlen der Lampe 1 in dem Bereich des Cool Spots auf eine Temperatur unterhalb von 40°C zu verhindern, ist auf das linke Stirnende der Lampe 1 die erfindungsgemäße Abschirmhülse 10 aufgeschoben. Im dargestellten Beispiel (nicht unter die Ansprüche fallend) besteht die Abschirmhülse 10 vollständig aus Aluminium. Wie der Darstellung in Fig. 1a oder 1b entnommen werden kann, ist die Abschirmhülse 10 derart im Bezug auf die Lampe 1 angeordnet, dass sie zwar die Zuleitungen 3a für die Lampenelektrode 2a umgibt, nicht jedoch die Elektrode 2a selbst. Hierdurch wird erreicht, dass der von der Lampe 1 abgegebene Lichtstrom durch das lichtundurchlässige Aluminium nicht beeinträchtigt wird.In order to prevent cooling of the lamp 1 in the region of the cool spot to a temperature below 40 ° C., in particular at low ambient temperatures, the shielding sleeve 10 according to the invention is pushed onto the left front end of the lamp 1. In the example shown (not covered by the claims), the shielding sleeve 10 is made entirely of aluminum. As the illustration in Fig. 1a or 1b can be removed, the shielding sleeve 10 is so in relation to the Lamp 1 is arranged so that it surrounds the leads 3a for the lamp electrode 2a, but not the electrode 2a itself. This ensures that the output from the lamp 1 luminous flux is not affected by the opaque aluminum.

Das die elektrischen Zuleitungen 3a umgebenden Aluminium der Abschirmhülse 10 hat zur Folge, dass die an der Elektrode 2a erzeugte Wärme reflektiert und die Lampe 1 in dem Stirnbereich zusätzlich erwärmt wird. Hierdurch wird erreicht, dass die Lampe 1 selbst bei Umgebungstemperaturen unterhalb von 25°C noch bei optimalen Temperaturen betrieben werden kann. Das linke Ende der Lampe 1, an dem sich der Cool Spot befindet, wird somit durch die Abschirmhülse 10 soweit erwärmt, dass es trotz der niedrigen Umgebungstemperaturen in dem für einen optimalen Lampenbetrieb erforderlichen Temperaturbereich von 40-44°C gehalten werden kann.The aluminum surrounding the electrical leads 3a of the shielding sleeve 10 has the consequence that the heat generated at the electrode 2a is reflected and the lamp 1 is additionally heated in the forehead area. This ensures that the lamp 1 can be operated even at ambient temperatures below 25 ° C even at optimum temperatures. The left end of the lamp 1, where the cool spot is located, is thus heated by the shielding sleeve 10 so far that it can be maintained in the required for optimum lamp operation temperature range of 40-44 ° C despite the low ambient temperatures.

Die Länge der Abschirmhülse 10 bestimmt dabei den Grad der erzielbaren Temperaturerhöhung. Es besteht somit die Möglichkeit, durch die Wahl der Länge der Abschirmhülse 10 verschiedene Umgebungstemperaturbereiche festzulegen, bei denen die Abschirmhülse 10 die geeigneten Effekte erzielt. Mit anderen Worten, es können unterschiedlich lange Abschirmhülsen 10 bereit gestellt werden, wobei jede Hülse jeweils für einen anderen Umgebungstemperaturbereich optimal ist.The length of the shielding sleeve 10 determines the degree of achievable temperature increase. There is thus the possibility, by selecting the length of the shielding sleeve 10, to set different ambient temperature ranges at which the shielding sleeve 10 achieves the suitable effects. In other words, different lengths of shielding sleeves 10 can be provided, each sleeve being optimal for a different ambient temperature range.

Vorzugsweise weist eine aus Aluminium bestehende Abschirmhülse 10 eine Länge von ca. 35-50 mm auf, wobei der Bereich, der über den Sockel geschoben wird, ca. 10mm lang und der Bereich, der den Glaskolben 4 umschließt ca. 25-40mm, insbesondere 30-35 mm lang ist. Die Wandstärke des den Glaskolben 4 umschließenden Bereichs der Hülse 10 liegt zwischen 0,5mm und 2mm, vorzugsweise bei ca. 1mm. Es hat sich gezeigt, dass mit einer Aluminiumhülse, welche eine Wandstärke von 1mm und eine Gesamtlänge von 40mm aufweist, die Temperatur, bei der die Lampe bei optimalen Bedingungen betrieben werden kann, um ca. 15° herabgesetzt werden kann. Geht man davon aus, dass eine T16-Lampe ohne Abschirmhülse üblicherweise bei einer Umgebungstemperatur zwischen 20° und 30° betrieben werden sollte, so besteht mit dieser Hülse somit die Möglichkeit, die Lampe bei Umgebungstemperaturen von 10° bis 15° noch optimal zu betreiben. Bei einer Aluminiumhülse mit einer Gesamtlänge von 45mm hingegen kann die Umgebungstemperatur sogar um ca. 20° herabgesetzt werden.Preferably, a shielding sleeve 10 made of aluminum has a length of about 35-50 mm, wherein the area which is pushed over the base, about 10mm long and the area surrounding the glass bulb 4 about 25-40mm, in particular 30-35 mm long. The wall thickness of the glass piston 4 enclosing portion of the sleeve 10 is between 0.5mm and 2mm, preferably at about 1mm. It has been found that with an aluminum sleeve, which has a wall thickness of 1 mm and a total length of 40 mm, the temperature at which the lamp can be operated under optimum conditions can be reduced by about 15 °. If one assumes that a T16 lamp without a shielding sleeve should normally be operated at an ambient temperature between 20 ° and 30 °, this sleeve thus offers the possibility of optimally operating the lamp at ambient temperatures of 10 ° to 15 °. For an aluminum sleeve with a total length of 45mm, however, the ambient temperature can even be reduced by about 20 °.

Die Fig. 2 und 3 zeigen die Abschirmhülse 10 in seitlicher Ansicht bzw. in Stirnansicht. Diese weist - wie in Fig. 2 dargestellt ist - eine der Form der Lampe entsprechende Innenkontur auf, so dass sie paßgenau auf das Stirnende der Lampe aufgesetzt werden kann.The FIGS. 2 and 3 show the shielding sleeve 10 in a side view or in front view. This points - as in Fig. 2 is shown - one of the shape of the lamp corresponding inner contour, so that it can be placed in register on the front end of the lamp.

Wie bereits erwähnt wurde, besteht die Abschirmhülse 10 im vorliegenden Fall vollständig aus Aluminium, da sich entgegen der ursprünglichen Vermutung, dass eine derartige Aluminiumhülse eher kühlende Wirkung hat, überraschend gezeigt hat, dass mit einer vollständig aus Aluminium bestehende Abschirmhülse sogar besonders gute Ergebnisse erzielt werden können. Dies wird darauf zurückgeführt, dass die Aluminiumhülse nicht nur die an der Lampenelektrode erzeugte Wärme zurückreflektiert, sondern sich zusätzlich auch noch erwärmt und die Wärme in gewünschter Weise auf die Lampe in dem Bereich des Cool Spots überleitet.As already mentioned, the shielding sleeve 10 in the present case is made entirely of aluminum, since contrary to the original assumption that such an aluminum sleeve has a cooling effect, it has surprisingly been found that even very good results are achieved with a shielding sleeve made entirely of aluminum can. This is attributed to the fact that the aluminum sleeve not only reflects back the heat generated at the lamp electrode, but additionally heats up and transfers the heat in the desired manner to the lamp in the area of the cool spot.

Erfindungsgemäß ist die Abschirmhülse aus einem aus - vorzugsweise transparenten - Kunststoff bestehenden Grundkörper gebildet, dessen Innenseite mit einer Aluminiumschicht bzw. mit einer anderen Schicht aus einem Material, das eine hohe Wärmeleitfähigkeit von zumindest 30 W/mK aufweist und reflektierend wirkt, überzogen ist. Auch bei dieser Variante besteht selbstverständlich die Möglichkeit, Abschirmhülsen unterschiedlicher Länge bereitzustellen, die jeweils für verschiedene Umgebungstemperaturbereiche geeignet sind.According to the invention, the shielding sleeve is formed from a base body made of - preferably transparent - plastic, the inside of which is coated with an aluminum layer or with another layer of a material which has a high thermal conductivity of at least 30 W / mK and has a reflective effect. Of course, in this variant, too, it is possible to provide shielding sleeves of different lengths, each of which is suitable for different ambient temperature ranges.

Mit der vorliegenden Erfindung wird somit eine einfache Möglichkeit geschaffen, ein Abkühlen einer Gasentladungslampe, insbesondere einer Niederdruckentladungslampe zu verhindern. Die Temperaturabschirmung durch die erfindungsgemäße Abschirmhülse ist dabei sogar so gut, dass T16-Lampen selbst bei sehr niedrigen Umgebungstemperaturen unterhalb von 25°C noch bei optimalen Temperaturen betrieben werden können.The present invention thus provides a simple possibility to prevent cooling of a gas discharge lamp, in particular a low-pressure discharge lamp. The temperature shield by the shielding according to the invention is even so good that T16 lamps can be operated even at very low ambient temperatures below 25 ° C even at optimum temperatures.

Claims (20)

  1. A lighting arrangement, having
    a cylindrically elongated gas discharge lamp (1), on both front ends of which in each case a lamp electrode (2a, 2b) protruding into the interior of the lamp body as well as corresponding electrical supply lines (3a, 3b) are arranged, as well as a shielding sleeve (10) surrounding one of the two front ends of the lamp (1), wherein the shielding sleeve (10) consists at least in part of a material with a good heat conductivity or has a layer made from such a heat-conductive material,
    characterized in
    that the shielding sleeve (10) consists of a base body consisting of plastic, which is covered at least over a part of its length with a layer of the heat-conductive material, the heat conductivity of which is greater than or equal to 30 W/mk.
  2. A lighting arrangement, having
    a cylindrically elongated gas discharge lamp (1), on both front ends of which in each case a lamp electrode (2a, 2b) protruding into the interior of the lamp body as well as corresponding electrical supply lines (3a, 3b) are arranged, as well as a shielding sleeve (10) surrounding one of the two front ends of the lamp (1), wherein the shielding sleeve (10) consists at least in part of a reflective material or has a reflective layer,
    characterized in
    that the shielding sleeve (10) consists of a base body consisting of plastic, which is covered at least over a part of its length with a layer of the reflective material.
  3. A lighting arrangement according to Claim 1 or 2,
    characterized in
    that the shielding sleeve (10) consists at least in part of metal or has a metal layer.
  4. A lighting arrangement according to Claim 3,
    characterized in
    that the metal is aluminum.
  5. A lighting arrangement according to one of the preceding claims,
    characterized in
    that the layer of the heat-conductive and/or reflective material covers the base body over the entire length.
  6. A lighting arrangement according to one of the preceding claims,
    characterized in
    that the base body consists of a transparent plastic.
  7. A lighting arrangement according to one of the preceding claims,
    characterized in
    that the shielding sleeve (10) is arranged with respect to the gas discharge lamp (1) such that it only surrounds the electrical supply lines (3a, 3b) of the corresponding lamp electrode (2a, 2b), however, not the lamp electrode (2a, 2b) itself.
  8. A lighting arrangement according to one of the preceding claims,
    characterized in
    that the electrical supply lines (3a, 3b) for the lamp electrodes (2a, 2b) vary in length, wherein the shielding sleeve (10) is arranged on the front end of the lamp electrode (2a, 2b) with the longer electrical supply lines (3a, 3b)
  9. A lighting arrangement according to one of the preceding claims,
    characterized in
    that the gas discharge lamp is a low-pressure discharge lamp (1).
  10. A lighting arrangement according Claim 9,
    characterized in
    that the gas discharge lamp is a T16 lamp.
  11. A lighting arrangement according to one of the preceding claims,
    characterized in
    that shielding sleeve (10) has a length of approx. 35-50 mm, wherein the area, which encloses the glass bulb (4) of the lamp (1) is approx. 25-40 mm, in particular 30-35 mm long.
  12. A lighting arrangement according Claim 11,
    characterized in
    that the area of the shielding sleeve (10) enclosing the glass bulb (4) of the lamp (1) has a wall thickness between 0.5 mm and 2 mm, in particular of approx. 1 mm.
  13. A shielding sleeve (10) for use in the case of a cylindrically elongated gas discharge lamp (1), on both front ends of which in each case a lamp electrode (2a, 2b) protruding into the interior of the lamp body as well as corresponding electrical supply lines (3a, 3b) are arranged,
    wherein the shielding sleeve (10) must be arranged with respect to the gas discharge lamp (1) such that it surrounds one of the two front ends,
    wherein the shielding sleeve (10) consists at least in part of a material with a good heat conductivity or has a layer made from such a heat-conductive material,
    characterized in
    that this consists of a base body consisting of plastic, which is covered at least over a part of its length with a layer of the heat-conductive material, the heat conductivity of which is greater than or equal to 30 W/mk.
  14. A shielding sleeve (10) for use in the case of a cylindrically elongated gas discharge lamp (1), on both front ends of which in each case a lamp electrode (2a, 2b) protruding into the interior of the lamp body as well as corresponding electrical supply lines (3a, 3b) are arranged,
    wherein the shielding sleeve (10) must be arranged with respect to the gas discharge lamp (1) such that it surrounds one of the two front ends,
    wherein the shielding sleeve (10) consists at least in part of a reflective material or has a reflective layer,
    characterized in
    that this consists of a base body consisting of plastic, which is covered at least over a part of its length with a layer of reflective material.
  15. A shielding sleeve according to Claim 13 or 14,
    characterized in
    that this consists at least in part of metal or has a metal layer.
  16. A shielding sleeve according to Claim 15,
    characterized in
    that the metal is aluminum.
  17. A shielding sleeve according any one of Claims 13 to 16,
    characterized in
    that the layer of heat-conductive and/or reflective material covers the base body over the entire length.
  18. A shielding sleeve according to any one of Claims 13 to 17,
    characterized in
    that the base body consists of a transparent plastic.
  19. A shielding sleeve according any one of Claims 13 to 18,
    characterized in
    that the shielding sleeve (10) has a length of approx. 35-50 mm, wherein the area, which encloses the glass bulb (4) of the lamp (1), is approx. 25-40 mm, in particular 30-35 mm long.
  20. A shielding sleeve according to Claim 19,
    characterized in
    that the area of the shielding sleeve (10) enclosing the glass bulb (4) of the lamp (1) has a wall thickness between 0.5 mm and 2 mm, in particular of approx. 1 mm.
EP04009233.0A 2003-05-15 2004-04-19 Lighting device comprising a gas discharge lamp and a protective sleeve Expired - Lifetime EP1482534B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20307607U 2003-05-15
DE20307607U DE20307607U1 (en) 2003-05-15 2003-05-15 Lighting arrangement consisting of a gas discharge lamp and a shielding sleeve

Publications (3)

Publication Number Publication Date
EP1482534A2 EP1482534A2 (en) 2004-12-01
EP1482534A3 EP1482534A3 (en) 2007-12-05
EP1482534B1 true EP1482534B1 (en) 2016-12-07

Family

ID=33039387

Family Applications (1)

Application Number Title Priority Date Filing Date
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EP (1) EP1482534B1 (en)
DE (1) DE20307607U1 (en)
NO (1) NO20042016L (en)

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DE102008048909A1 (en) * 2008-09-26 2010-04-01 Zumtobel Lighting Gmbh Luminaire with closed luminaire housing
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EP1482534A2 (en) 2004-12-01
NO20042016L (en) 2004-11-16
EP1482534A3 (en) 2007-12-05

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