EP0987737B1 - Fluorescent lamp - Google Patents

Fluorescent lamp Download PDF

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Publication number
EP0987737B1
EP0987737B1 EP99112629A EP99112629A EP0987737B1 EP 0987737 B1 EP0987737 B1 EP 0987737B1 EP 99112629 A EP99112629 A EP 99112629A EP 99112629 A EP99112629 A EP 99112629A EP 0987737 B1 EP0987737 B1 EP 0987737B1
Authority
EP
European Patent Office
Prior art keywords
discharge tube
fluorescent lamp
electrode
thermally conducting
lamp according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99112629A
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German (de)
French (fr)
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EP0987737A1 (en
Inventor
Andreas Hollstein
Martin Beck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
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Publication of EP0987737A1 publication Critical patent/EP0987737A1/en
Application granted granted Critical
Publication of EP0987737B1 publication Critical patent/EP0987737B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • 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

Definitions

  • the invention is based on a fluorescent lamp according to the preamble of claim 1.
  • the cold spot temperature at which the excess mercury condenses and provides optimum luminous flux during lamp operation is at an ambient temperature of approximately 25 ° C.
  • the cold spot lies in the middle of the discharge tube on the inner glass wall.
  • the temperature of the cold junction must be approx. 40 ° C in order to achieve optimum light output , This is achieved at an ambient temperature of about 35 ° C.
  • an electrode by forming a longer constitutionaleinschmelzung further displaced into the discharge tube, so that behind this electrode can form a cooling point of about 40 ° C.
  • This idea is under protection.
  • the task should be accomplished with simple means and should not result in any fundamental changes in the construction of the lamp.
  • the heat in the glass tube be conducted in the area of this electrode to the base.
  • the cold spot is moved from a point behind the electrode back into the center of the lamp and then there, due to the lower outside temperatures of less than 25 ° C, an optimum temperature.
  • the heat-conducting material preferably consists of a heat-conducting coating on the outer wall of the discharge tube or of a thermally conductive foil which surrounds the discharge tube in this area over the entire outer circumference.
  • a heat-conducting material is applied or mounted on the outside of the glass tube.
  • the heat-conducting material should extend at least from the electrode coil to the edge of the base sleeve. It is even better if the heat-conducting material extends beyond the electrode coil in the direction of the glass tube center and, in the case of a foil, is soldered or welded to the base shell. In the case of a thermally conductive foil, this preferably contains aluminum or copper.
  • a straight fluorescent lamp 1 is shown according to the invention in a partially cut and shortened form.
  • the fluorescent lamp 1 with a power consumption of 54 W has a discharge tube 2 made of glass with an outer diameter of 16 mm and a length of 1150 mm, in both ends of which one electrode 3, 4 is fused on a foot 5, 6.
  • the foot 5 of the one electrode 3 is in this case 20 mm longer, so that the coil 7 of the one electrode 3 is further away from the associated end of the discharge tube 2 by 20 mm than the coil 8 of the other electrode 4.
  • the fluorescent lamp 1 also has a - because of the clarity - not shown phosphor coating on the inside of the discharge tube. 2
  • this fluorescent lamp according to the invention 1 corresponds to a fluorescent lamp for indoor use, wherein in the indoor operation behind the electrode coil 7 on the longer foot 5, a cold spot (cold spot) with a temperature of 40 ° C at an ambient temperature of about 35 ° C forms and so ensures optimum luminous flux output.
  • the two ends of the discharge tube 2 are closely surrounded by a sleeve made of a copper-aluminum foil 15, 16 of approximately 0.1 mm thickness, which is 5 mm (seen from the center of the discharge tube 2 in the direction of the end) in front of the respective one Electrode coil 7, 8 starts and about 5 mm, the base sleeve 11, 12 overlaps.
  • a fluorescent lamp for outdoor use is created from a fluorescent lamp for indoor use.
  • the film sleeves 15, 16 provide in operation for a strong heating of the interior behind the electrode coils 7, 8, so that now forms the cold spot in the middle of the discharge tube 2 on the inner wall.
  • the cold spot receives during outdoor use with an ambient temperature of about 5 ° C during operation, a temperature of about 40 ° C, so that sets at this outdoor temperature optimal luminous flux output.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Description

Technisches GebietTechnical area

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

Stand der TechnikState of the art

Bei den bekannten Leuchtstofflampen mit Außenrohrdurchmessern von grö-βer 26 mm, wie z. B. die T12-Lampen mit 38 mm, ist die Temperatur der Kaltstelle (Cold Spot), an der das überschüssige Quecksilber kondensiert und die für einen optimalen Lichtstrom beim Lampenbetrieb sorgt, auf eine Umgebungstemperatur von ca. 25°C ausgelegt. Die Kaltstelle liegt dabei in der Mitte des Entladungsrohrs an der inneren Glaswand.In the known fluorescent lamps with outer tube diameters of greater than 26 mm, such as. For example, if the 38 mm T12 lamps are used, the cold spot temperature at which the excess mercury condenses and provides optimum luminous flux during lamp operation is at an ambient temperature of approximately 25 ° C. The cold spot lies in the middle of the discharge tube on the inner glass wall.

Bei den neuen Leuchtstofflampen mit Außenrohrdurchmessern kleiner gleich 26 mm (T8, T5), die speziell für die Innenraumbeleuchtung (Umgebungstempertur größer 25°C) entwickelt wurden, muß die Temperatur der Kaltstelle bei ca. 40°C liegen, damit eine optimale Lichtausbeute erzielt wird. Dies wird bei einer Umgebungstemperatur von ca. 35°C erreicht. Mit abnehmendem Innendurchmesser ist es notwendig die Kaltstelle von der Lampenmitte an eine Stelle hinter den Elektroden zu verlagern, da in der Mitte des Entladungsrohrs aufgrund der immer hoher werdenden Stromdichte keine so niedrige Temperatur von ca. 40°C mehr erreicht werden kann. Hierzu wird eine Elektrode durch Ausbildung einer längeren Fußeinschmelzung weiter in das Entladungsrohr hineinversetzt, so dass sich hinter dieser Elektrode eine Kühlstelle von ca. 40°C ausbilden kann. In der JP-A-3-114138 ist diese Idee unter Schutz gestellt.For the new fluorescent tubes with outer tube diameters smaller than or equal to 26 mm (T8, T5), which were specially developed for interior lighting (ambient temperature greater than 25 ° C), the temperature of the cold junction must be approx. 40 ° C in order to achieve optimum light output , This is achieved at an ambient temperature of about 35 ° C. With decreasing inner diameter, it is necessary to move the cold spot from the center of the lamp to a point behind the electrodes, as in the middle of the discharge tube due to the ever-increasing current density no so low temperature of about 40 ° C can be achieved. For this purpose, an electrode by forming a longer Fußeinschmelzung further displaced into the discharge tube, so that behind this electrode can form a cooling point of about 40 ° C. In the JP-A-3-114138 This idea is under protection.

Nachdem diese Lampen aufgrund ihrer hohen Lichtausbeute und Ihrer schlanken Ausführung sehr starken Anklang gefunden haben, war es nun von Interesse diese Lampen auch in der Außenbeleuchtung (Umgebungstemperaturen kleiner 25°C) einzusetzen. Hierfür ist jedoch die Temperatur der Kühlstelle hinter der Elektrode nicht ausgelegt, so dass sich bei diesen Lampen keine optimalen Lichtausbeuten erzielen lassen.Since these lamps were very well received due to their high luminous efficiency and slim design, it was now of interest to use these lamps also in outdoor lighting (ambient temperatures below 25 ° C). For this, however, the temperature of the cooling point behind the electrode is not designed so that can be achieved with these lamps no optimal light output.

Darstellung der ErfindungPresentation of the invention

Es ist Aufgabe der vorliegenden Erfindung, eine Leuchtstofflampe mit einem Entladungsrohr mit einem Außendurchmesser kleiner gleich 26 mm gemäß dem Oberbegriff des Anspruchs 1 bereitzustellen, die auch bei Außenbetrieb mit kälteren Umgebungstemperaturen kleiner 25°C eine optimale Lichtausbeute gewährleistet. Die Aufgabe sollte mit einfachen Mitteln zu bewerkstelligen sein und keine grundlegenden Änderungen des Lampenaufbaus zur Folge haben.It is an object of the present invention to provide a fluorescent lamp with a discharge tube having an outer diameter less than or equal to 26 mm according to the preamble of claim 1, which ensures an optimal light output even in outdoor operation with colder ambient temperatures less than 25 ° C. The task should be accomplished with simple means and should not result in any fundamental changes in the construction of the lamp.

Diese Aufgabe wird durch das kennzeichnende Merkmal des Anspruchs 1 gelöst. Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.This object is achieved by the characterizing feature of claim 1. Particularly advantageous embodiments can be found in the dependent claims.

Durch die Anbringung eines gut wärmeleitenden Materials im Bereich der weiter in das Entladungsrohr versetzten Elektrode kann die Wärme im Glasrohr im Bereich dieser Elektrode zum Sockel hin geleitet werden. Dadurch wird die Kaltstelle von einem Punkt hinter der Elektrode wieder in die Lampenmitte verlagert und erhält dann dort, aufgrund der niedrigeren Außentemperaturen von kleiner 25°C eine optimale Temperatur.By attaching a good heat-conducting material in the region of the further offset in the discharge tube electrode, the heat in the glass tube be conducted in the area of this electrode to the base. As a result, the cold spot is moved from a point behind the electrode back into the center of the lamp and then there, due to the lower outside temperatures of less than 25 ° C, an optimum temperature.

Bevorzugt besteht das wärmeleitende Material aus einer wärmeleitenden Beschichtung auf der Außenwand des Entladungsrohrs oder aus einer wärmeleitenden Folie, die das Entladungsrohrs in diesem Bereich über den gesamten äußeren Umfang umgibt. Bevorzugt ist auch im Bereich der anderen eingeschmolzenen Elektrode außen auf dem Glasrohr ein solches wärmeleitendes Material auf- bzw. angebracht.The heat-conducting material preferably consists of a heat-conducting coating on the outer wall of the discharge tube or of a thermally conductive foil which surrounds the discharge tube in this area over the entire outer circumference. Preferably, in the region of the other melted electrode, such a heat-conducting material is applied or mounted on the outside of the glass tube.

Für eine optimale Aufheizung sollte das wärmeleitende Material mindestens von der Elektrodenwendel bis zum Rand der Sockelhülse reichen. Noch besser ist es, wenn das wärmeleitende Material in Richtung Glasrohrmitte über die Elektrodenwendel hinausreicht und - im Falle einer Folie - mit der Sokkelhülse verlötet oder verschweißt ist. Im Fall einer wärmeleitenden Folie enthält diese bevorzugt Aluminium oder Kupfer.For optimum heating, the heat-conducting material should extend at least from the electrode coil to the edge of the base sleeve. It is even better if the heat-conducting material extends beyond the electrode coil in the direction of the glass tube center and, in the case of a foil, is soldered or welded to the base shell. In the case of a thermally conductive foil, this preferably contains aluminum or copper.

Beschreibung der ZeichnungenDescription of the drawings

Im folgenden ist die Erfindung anhand eines Ausführungsbeispiels näher erläutert.In the following the invention with reference to an embodiment is explained in detail.

In der Figur ist eine gerade Leuchtstofflampe 1 gemäß der Erfindung in teilweise geschnittener und verkürzter Form wiedergegeben. Die Leuchtstofflampe 1 mit einer Leistungsaufnahme von 54 W besitzt ein Entladungsrohr 2 aus Glas mit einem Außendurchmesser von 16 mm und einer Länge von 1150 mm, in dessen beide Enden jeweils eine Elektrode 3, 4 auf einem Fuß 5, 6 eingeschmolzen ist. Der Fuß 5 der einen Elektrode 3 ist hierbei 20 mm länger, so daß die Wendel 7 der einen Elektrode 3 um 20 mm weiter vom dazugehörigen Ende des Entladungsrohrs 2 entfernt ist als die Wendel 8 der anderen Elektrode 4. Auf die beiden Enden des Entladungsrohrs 2 sind Sockel 9, 10 mit Sockelhülsen 11, 12 sowie Sockelstiften 13, 14, die elektrisch mit den Elektroden 3, 4 verbunden sind, aufgebracht. Die Leuchtstofflampe 1 besitzt außerdem eine - wegen der Anschaulichkeit - nicht dargestellte Leuchtstoffbeschichtung auf der Innenseite des Entladungsrohrs 2.In the figure, a straight fluorescent lamp 1 is shown according to the invention in a partially cut and shortened form. The fluorescent lamp 1 with a power consumption of 54 W has a discharge tube 2 made of glass with an outer diameter of 16 mm and a length of 1150 mm, in both ends of which one electrode 3, 4 is fused on a foot 5, 6. The foot 5 of the one electrode 3 is in this case 20 mm longer, so that the coil 7 of the one electrode 3 is further away from the associated end of the discharge tube 2 by 20 mm than the coil 8 of the other electrode 4. On the two ends of the discharge tube 2 are base 9, 10 with base sleeves 11, 12 and base pins 13, 14, which are electrically connected to the electrodes 3, 4, applied. The fluorescent lamp 1 also has a - because of the clarity - not shown phosphor coating on the inside of the discharge tube. 2

Insoweit entspricht diese erfindungsgemäße Leuchtstofflampe 1 einer Leuchtstofflampe für die Innenanwendung, wobei sich im Innenbetrieb hinter der Elektrodenwendel 7 auf dem längeren Fuß 5 eine Kühlstelle (Cold Spot) mit einer Temperatur von 40°C bei einer Umgebungstemperatur von ca. 35°C ausbildet und so für eine optimale Lichtstromabgabe sorgt.In that regard, this fluorescent lamp according to the invention 1 corresponds to a fluorescent lamp for indoor use, wherein in the indoor operation behind the electrode coil 7 on the longer foot 5, a cold spot (cold spot) with a temperature of 40 ° C at an ambient temperature of about 35 ° C forms and so ensures optimum luminous flux output.

Erfindungsgemäß sind die beiden Enden des Entladungsrohrs 2 von einer Hülse aus einer Kupfer-Aluminium-Folie 15, 16 von ca. 0,1 mm Stärke eng umgeben, die 5 mm (von der Mitte des Entladungsrohrs 2 in Richtung Ende gesehen) vor der jeweiligen Elektrodenwendel 7, 8 beginnt und ca. 5 mm die Sockelhülse 11, 12 überlappt.According to the invention, the two ends of the discharge tube 2 are closely surrounded by a sleeve made of a copper-aluminum foil 15, 16 of approximately 0.1 mm thickness, which is 5 mm (seen from the center of the discharge tube 2 in the direction of the end) in front of the respective one Electrode coil 7, 8 starts and about 5 mm, the base sleeve 11, 12 overlaps.

Durch diese zusätzlichen Folienhülsen 15, 16 wird aus einer Leuchtstofflampe für die Innenanwendung eine Leuchtstofflampe für die Außenanwendung geschaffen. Die Folienhülsen 15, 16 sorgen im Betrieb für eine starke Aufheizung des Innenraums hinter den Elektrodenwendeln 7, 8, so daß sich nun die Kaltstelle in der Mitte des Entladungsrohrs 2 an der Innenwand ausbildet. Die Kaltstelle erhält bei der Außenanwendung mit einer Umgebungstemperatur von ca. 5°C im Betrieb eine Temperatur von ca. 40°C, so daß sich bei dieser Außentemperatur eine optimale Lichtstromabgabe einstellt. By means of these additional film sleeves 15, 16, a fluorescent lamp for outdoor use is created from a fluorescent lamp for indoor use. The film sleeves 15, 16 provide in operation for a strong heating of the interior behind the electrode coils 7, 8, so that now forms the cold spot in the middle of the discharge tube 2 on the inner wall. The cold spot receives during outdoor use with an ambient temperature of about 5 ° C during operation, a temperature of about 40 ° C, so that sets at this outdoor temperature optimal luminous flux output.

Claims (8)

  1. Fluorescent lamp (1) for exterior lighting comprising a straight or circularly bent discharge tube (2) made from glass with a circular cross section, an electrode (3, 4) sealed into each end of the discharge tube (2), one electrode (3) being arranged at a somewhat greater distance from the end of the discharge tube (2) than the other electrode (4) so that a cold spot can form behind this electrode, a fluorescent coating on the inner wall of the discharge tube (2) and a mercury-inert gas filling as well as a base (9, 10) fitted respectively at either end of the discharge tube (2) and having at least one base pin (13, 14) and a base shell (11, 12), characterized in that the straight or circularly bent discharge tube made from glass has a cross section with an outside diameter of less than or equal to 26 mm, and in that, at least in the region of one electrode (3) sealed at a somewhat greater distance from the end of the discharge tube (2), a material which is a good conductor of heat is provided outside on the discharge tube (2).
  2. Fluorescent lamp according to Claim 1, characterized in that in the region of the other sealed electrode (4) as well, a material which is a good conductor of heat is provided outside on the discharge tube (2).
  3. Fluorescent lamp according to Claim 1, characterized in that the thermally conducting material consists of a thermally conducting coating.
  4. Fluorescent lamp according to Claim 1, characterized in that the thermally conducting material consists of a thermally conducting foil (15, 16).
  5. Fluorescent lamp according to Claim 1, characterized in that the thermally conducting material reaches at least from the filament (7, 8) of the electrode (3, 4) up to the inner edge of the base shell (11, 12).
  6. Fluorescent lamp according to Claim 5, characterized in that the thermally conducting material surrounds the discharge tube (2) over the entire outer circumference.
  7. Fluorescent lamp according to Claim 4, characterized in that the thermally conducting foil (15, 16) contains aluminum and/or copper.
  8. Fluorescent lamp according to one of Claims 4 to 7, characterized in that the thermally conducting foil is soldered or welded to the base shell.
EP99112629A 1998-09-18 1999-07-02 Fluorescent lamp Expired - Lifetime EP0987737B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19842795 1998-09-18
DE19842795A DE19842795A1 (en) 1998-09-18 1998-09-18 Fluorescent lamp

Publications (2)

Publication Number Publication Date
EP0987737A1 EP0987737A1 (en) 2000-03-22
EP0987737B1 true EP0987737B1 (en) 2013-01-09

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EP99112629A Expired - Lifetime EP0987737B1 (en) 1998-09-18 1999-07-02 Fluorescent lamp

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US (1) US6359376B1 (en)
EP (1) EP0987737B1 (en)
CA (1) CA2282219C (en)
DE (1) DE19842795A1 (en)

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FR2795553A1 (en) * 1999-06-28 2000-12-29 Koninkl Philips Electronics Nv INCANDESCENT LAMP COMPRISING A TUBULAR SHAPE GLASS BULB IN WHICH A AXIS OF A FILAMENT IS ARRANGED
DE10120667B4 (en) * 2001-04-27 2007-11-22 Siteco Beleuchtungstechnik Gmbh Lamp with a lamp with cooled cold foot
DE20307607U1 (en) * 2003-05-15 2004-09-23 Zumtobel Staff Gmbh Lighting arrangement consisting of a gas discharge lamp and a shielding sleeve
US7279840B2 (en) 2004-11-17 2007-10-09 Matsushita Electric Works Ltd. Electrodeless fluorescent lamp with controlled cold spot temperature
KR101157289B1 (en) * 2005-06-30 2012-06-15 엘지디스플레이 주식회사 Backlight assembly and liquid crystal display having the same
KR20070010844A (en) * 2005-07-20 2007-01-24 삼성전자주식회사 Planar light source device and display device provided with the same
US7612491B2 (en) * 2007-02-15 2009-11-03 Applied Materials, Inc. Lamp for rapid thermal processing chamber
WO2008142630A1 (en) * 2007-05-24 2008-11-27 Philips Intellectual Property & Standards Gmbh Discharge lamp and headlights for a motor vehicle

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DE2905960A1 (en) * 1978-05-12 1979-11-15 Egyesuelt Izzolampa ELECTRIC DISCHARGE TUBE - IN PARTICULAR, HIGH PRESSURE SODIUM VAPOR LAMP AND HALOGEN VAPOR LAMP THAT CAN BE OPERATED IN A FREE AIR ATMOSPHERE - WITH A DEVICE TO INFLUENCE THE TEMPERATURE DISTRIBUTION OF THE DISCHARGE SPACE

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DE2905960A1 (en) * 1978-05-12 1979-11-15 Egyesuelt Izzolampa ELECTRIC DISCHARGE TUBE - IN PARTICULAR, HIGH PRESSURE SODIUM VAPOR LAMP AND HALOGEN VAPOR LAMP THAT CAN BE OPERATED IN A FREE AIR ATMOSPHERE - WITH A DEVICE TO INFLUENCE THE TEMPERATURE DISTRIBUTION OF THE DISCHARGE SPACE

Also Published As

Publication number Publication date
CA2282219C (en) 2008-05-06
CA2282219A1 (en) 2000-03-18
US6359376B1 (en) 2002-03-19
EP0987737A1 (en) 2000-03-22
DE19842795A1 (en) 2000-03-23

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