EP0718869B1 - Low pressure discharge lamp - Google Patents

Low pressure discharge lamp Download PDF

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Publication number
EP0718869B1
EP0718869B1 EP95119041A EP95119041A EP0718869B1 EP 0718869 B1 EP0718869 B1 EP 0718869B1 EP 95119041 A EP95119041 A EP 95119041A EP 95119041 A EP95119041 A EP 95119041A EP 0718869 B1 EP0718869 B1 EP 0718869B1
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EP
European Patent Office
Prior art keywords
amalgam
pressure discharge
glass
discharge lamp
low
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EP95119041A
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German (de)
French (fr)
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EP0718869A1 (en
Inventor
Friedrich Lauter
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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
    • H01J61/04Electrodes; Screens; Shields
    • H01J61/06Main electrodes
    • H01J61/067Main electrodes for low-pressure discharge lamps
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/24Means for obtaining or maintaining the desired pressure within the vessel
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00Gas-discharge or vapour-discharge lamps
    • H01J61/02Details
    • H01J61/54Igniting arrangements, e.g. promoting ionisation for starting

Definitions

  • the invention relates to a low-pressure discharge lamp according to the preamble of claim 1.
  • amalgam low-pressure discharge lamp With this type of lamp, the mercury filling component is within of the discharge vessel as an amalgam.
  • Such lamps have an operational amalgam and one or more so-called start-up amalgams.
  • the operational amalgam is usually on one Place inside the discharge vessel, which during the Lamp operation only a slightly fluctuating temperature between 90 ° C and 100 ° C.
  • the start-up amalgams are on hotter ones Establish as the operational amalgam and ensure, once done Ignition, the rapid start-up of the low-pressure discharge lamp shortly after the lamp was lit before the operational amalgam has reached its optimal temperature, mercury vapor for discharge provide.
  • Such a low-pressure discharge lamp which corresponds to the preamble of patent claim 1, is for example in the article "The mercury vapor pressure of indium amalgam and the luminous flux temperature curve of the new indium amalgam fluorescent lamps "from Hofmann & Rasch on pages 106-119 (especially pages 117-118) in the volume 11 of the "Technical-Scientific Treatises of the Osram Society” Springer Verlag 1973.
  • the lamp disclosed here has in addition to the operational or main amalgam, which is on the plate base of the plate tube melt is applied, two start-up or auxiliary amalgams.
  • the first start-up amalgam is on an electrode cap, in the immediate vicinity Near the electrode coil, attached while the second start-up amalgam is arranged in the area of the squeezed tube, in which the power supply lines for the electrode coil are squeezed in a gas-tight manner are.
  • the published PCT / US 92/10301 WO 93/11557 describes also one corresponding to the preamble of claim 1 Low pressure discharge lamp.
  • this lamp exists the electrode frame does not melt from a plate tube like that aforementioned indium amalgam fluorescent lamp, but essentially just from a glass rod that the electrode coil and their Power supply lines before and during the crushing of the discharge vessel ends stabilized.
  • the lamp disclosed here has one small ampoule filled with the start-up amalgam Power supply is held near the helix. This power supply is wrapped around the ampoule several times, like a heating coil and heats it up.
  • the aforementioned type of electrode rack and the tight squeezing of the discharge vessel ends over the Power supply is mainly used for compact fluorescent lamps applied while melting the plate tube more often encountered with rod-shaped T8, T10 and T12 fluorescent lamps.
  • the published patent application FR 2 438 912 describes a low-pressure discharge lamp with a carrier body containing amalgam.
  • the carrier body consists of a metal plate shaped in this way is that it forms a cavity in which the amalgam generator or the amalgam is arranged. The cavity communicates through a small opening with the discharge space of the low-pressure discharge lamp.
  • the carrier body for the amalgam is on the vitreous Plate tube melting of a lamp electrode with the help of a Adhesive or by means of a support wire near the lamp electrode attached.
  • the low-pressure discharge lamp according to the invention has a Carrier body for the start-up amalgam, which immediately in one to Glass body belonging to the electrode frame is melted or attached this has melted. For this, the carrier body is still in the pierced soft glass of the vitreous or on the vitreous glass. After the glass has cooled, the amalgam carrier body in simple and reliable
  • the carrier body can be on this Both in a plate tube base made of glass and in one attached the electrode frame stabilizing glass bead or glass rod become.
  • the carrier body for the amalgam is particularly advantageous a metal sheet or metal grid coated with an amalgam former.
  • a simple metal wire coated with amalgam former comes also as a carrier body in question.
  • the amalgam carrier body according to the invention can be placed so that the hottest part of the electrode rack located on the carrier body itself and thereby creeping of the amalgam generator in the direction of the electrode coil prevented becomes.
  • FIG. 1 A discharge vessel end of a low-pressure discharge lamp, in particular a compact fluorescent lamp, according to the first exemplary embodiment of the invention is shown schematically in FIG.
  • This lamp has a tubular discharge vessel 1 made of glass, which is sealed gas-tight at its ends by means of a pinch seal 2.
  • Two current leads 3, 4 for an electrode coil 5 arranged inside the discharge vessel 1 protrude from the pinch seal 2.
  • the two power supplies 3, 4 are each welded to one end of the electrode coil 5. Together with the electrode coil 5 and a glass bead 6, in which the current leads 3, 4 are melted, they form an electrode frame of the fluorescent lamp.
  • the glass bead 6 serves to fix the current leads 3, 4 connected to the electrode coil 5 during the production of the pinch seal 2.
  • the glass bead 6 there is also a metal sheet 7 coated with indium, e.g. B. iron sheet, melted by being inserted into the still soft glass of the pearl 6 about 0.3 mm deep.
  • the penetration position is selected such that the hottest point of the electrode frame is on the iron sheet 7 during lamp operation and thus prevents the indium from creeping in the direction of the electrode coil.
  • the metal sheet 7 can additionally be mechanically bent after the glass bead 6 has solidified.
  • the area of the metal sheet is approximately 2.5 ⁇ 7 mm 2 and its thickness is approximately 0.2 mm.
  • the mercury introduced into the low-pressure discharge lamp as a filling component forms indium amalgam with the indium on the metal sheet 7, which accelerates the start-up of the lamp and is therefore referred to as auxiliary or start-up amalgam.
  • FIG. 2 shows the unsocked discharge vessel end of a low-pressure discharge lamp according to a second exemplary embodiment of the invention.
  • This lamp has a tube-like discharge vessel 1 'made of glass, the ends of which are each sealed gas-tight by means of a plate tube melt 6'.
  • Two current leads 3 ', 4' protrude from the discharge vessel end, each of which is electrically conductively connected to one end of a spiral electrode 5 'arranged inside the discharge vessel 1'.
  • the plate tube melt 6 ' is a glass tube - called a plate tube - through which the current leads 3', 4 'and the pump stem 8' are threaded.
  • the upper end 6a 'of this plate tube 6' is tightly squeezed over the current leads 3 ', 4' and the pump stem 8 ', while the lower end 6b' is funnel-shaped to form a plate and is sealed gas-tight with the discharge vessel end.
  • the pinch seal 6a 'of the plate tube 6' forms, together with the current leads 3 ', 4' and the electrode coil 5 ', an electrode frame of the low-pressure discharge lamp.
  • an indium-coated metal sheet 7 ' is partially melted in the pinch seal area 6a' of the plate tube melt 6 'by being inserted into the glass of the plate tube 6a', which is not yet completely solid, about 0.3 mm deep.
  • this metal sheet are approximately 2.5 x 7 x 0.2 mm 3 .
  • the mercury introduced into the low-pressure discharge lamp as a filling component forms indium amalgam with the indium on the metal sheet 7 ′, which accelerates the start-up of the lamp.
  • the support body for the amalgam can be other sheets of high-melting metals are also used become. Also suitable as a support body instead of sheets also differently shaped metal bodies coated with an amalgam former, For example, metal grids or metal wires that run into the glass bead or are partially melted into the plate tube.
  • the size of the Carrier body is essentially only by the diameter of the Discharge vessel limited. In addition to indium come as amalgam formers other metals such as B. Cadmium in question. The size of the Carrier body and the layer thickness of the amalgam former on the carrier body and thus also the amount of amalgam form depends on the respective Lamp type.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Description

Die Erfindung betrifft eine Niederdruckentladungslampe gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a low-pressure discharge lamp according to the preamble of claim 1.

Insbesondere handelt es sich um eine Amalgam-Niederdruckentladungslampe. Bei diesem Lampentyp liegt die Quecksilberfüllungskomponente innerhalb des Entladungsgefäßes als Amalgam gebunden vor. Üblicherweise besitzten derartige Lampen ein Betriebs-Amalgam sowie ein oder mehrere sogenannte Anlauf-Amalgame. Das Betriebs-Amalgam ist gewöhnlich an einem Ort innerhalb des Entladungsgefäßes angebracht, der während des Lampenbetriebes eine nur geringfügig schwankende Temperatur zwischen ca. 90 °C und 100 °C annimmt. Die Anlauf-Amalgame befinden sich an heißeren Stellen als das Betriebs-Amalgam und gewährleisten, nach erfolgter Zündung, den schnellen Anlauf der Niederdruckentladungslampe, indem sie bereits kurz nach der Lampenzündung, bevor das Betriebs-Amalgam seine optimale Temperatur erreicht hat, Quecksilberdampf für die Entladung bereitstellen.In particular, it is an amalgam low-pressure discharge lamp. With this type of lamp, the mercury filling component is within of the discharge vessel as an amalgam. Usually Such lamps have an operational amalgam and one or more so-called start-up amalgams. The operational amalgam is usually on one Place inside the discharge vessel, which during the Lamp operation only a slightly fluctuating temperature between 90 ° C and 100 ° C. The start-up amalgams are on hotter ones Establish as the operational amalgam and ensure, once done Ignition, the rapid start-up of the low-pressure discharge lamp shortly after the lamp was lit before the operational amalgam has reached its optimal temperature, mercury vapor for discharge provide.

Eine derartige, dem Oberbegriff des Patentanspruchs 1 entsprechende Niederdruckentladungslampe, ist beispielsweise in dem Aufsatz "Der Hg-Dampfdruck von Indiumamalgam und die Lichtstrom-Temperaturkurve der neuen Indiumamalgam-Leuchtstofflampen" von Hofmann & Rasch, abgedruckt auf den Seiten 106-119 (insbesondere auf den Seiten 117-118) im Band 11 der "Technisch-wissenschaftlichen Abhandlungen der Osram-Gesellschaft" Springer-Verlag 1973, beschrieben. Die hier offenbarte Lampe besitzt neben dem Betriebs- oder Haupt-Amalgam, das auf dem Tellerfuß der Tellerrohreinschmelzung aufgetragen ist, noch zwei Anlauf- oder Hilfs-Amalgame. Das erste Anlauf-Amalgam ist auf einer Elektrodenkappe, in unmittelbarer Nähe der Elektrodenwendel, angebracht, während das zweite Anlauf-Amalgam im Bereich der Tellerrohrquetschung angeordnet ist, in der die Stromzuführungen für die Elektrodenwendel gasdicht eingequetscht sind.Such a low-pressure discharge lamp, which corresponds to the preamble of patent claim 1, is for example in the article "The mercury vapor pressure of indium amalgam and the luminous flux temperature curve of the new indium amalgam fluorescent lamps "from Hofmann & Rasch on pages 106-119 (especially pages 117-118) in the volume 11 of the "Technical-Scientific Treatises of the Osram Society" Springer Verlag 1973. The lamp disclosed here has in addition to the operational or main amalgam, which is on the plate base of the plate tube melt is applied, two start-up or auxiliary amalgams. The first start-up amalgam is on an electrode cap, in the immediate vicinity Near the electrode coil, attached while the second start-up amalgam is arranged in the area of the squeezed tube, in which the power supply lines for the electrode coil are squeezed in a gas-tight manner are.

Die Offenlegungsschrift PCT/US 92/10301 WO 93/11557 beschreibt ebenfalls eine dem Oberbegriff des Patentanspruchs 1 entsprechende Niederdruckentladungslampe. Allerdings besteht bei dieser Lampe das Elektrodengestell nicht aus einer Tellerrohreinschmelzung wie die vorgenannte Indiumamalgam-Leuchtstofflampe, sondern im wesentlichen nur aus einem Glasstab, der die Elektrodenwendel und ihre Stromzuführungen vor und während des Dichtquetschens der Entladungsgefäßenden stabilisiert. Die hier offenbarte Lampe besitzt eine kleine, mit dem Anlauf-Amalgam gefüllte Ampulle, die von einer Stromzuführung in Wendelnähe gehaltert wird. Diese Stromzuführung ist dabei mehrmals, wie eine Heizwicklung, um die Ampulle gewickelt und heizt diese auf. Die vorgenannte Art von Elektrodengestell sowie das Dichtquetschen der Entladungsgefäßenden über den Stromzuführungen wird vorwiegend bei kompakten Leuchtstofflampen angewendet, während man die Tellerrohreinschmelzung häufiger bei stabförmigen T8-, T10- und T12-Leuchtstofflampen antrifft.The published PCT / US 92/10301 WO 93/11557 describes also one corresponding to the preamble of claim 1 Low pressure discharge lamp. However, this lamp exists the electrode frame does not melt from a plate tube like that aforementioned indium amalgam fluorescent lamp, but essentially just from a glass rod that the electrode coil and their Power supply lines before and during the crushing of the discharge vessel ends stabilized. The lamp disclosed here has one small ampoule filled with the start-up amalgam Power supply is held near the helix. This power supply is wrapped around the ampoule several times, like a heating coil and heats it up. The aforementioned type of electrode rack and the tight squeezing of the discharge vessel ends over the Power supply is mainly used for compact fluorescent lamps applied while melting the plate tube more often encountered with rod-shaped T8, T10 and T12 fluorescent lamps.

Die Offenlegungsschrift FR 2 438 912 beschreibt eine Niederdrukkentladungslampe mit einem Amalgam enthaltenden Trägerkörper. Der Trägerkörper besteht aus einer Metallplatte, die derart geformt ist, daß sie einen Hohlraum bildet, in dem der Amalgambildner bzw. das Amalgam angeordnet ist. Der Hohlraum kommuniziert über eine kleine Öffnung mit dem Entladungsraum der Niederdruckentladungslampe. Der Trägerkörper für das Amalgam ist auf dem Glaskörper der Tellerrohreinschmelzung einer Lampenelektrode mit Hilfe eines Klebstoffes oder mittels eines Stützdrahtes nahe der Lampenelektrode befestigt. The published patent application FR 2 438 912 describes a low-pressure discharge lamp with a carrier body containing amalgam. The carrier body consists of a metal plate shaped in this way is that it forms a cavity in which the amalgam generator or the amalgam is arranged. The cavity communicates through a small opening with the discharge space of the low-pressure discharge lamp. The carrier body for the amalgam is on the vitreous Plate tube melting of a lamp electrode with the help of a Adhesive or by means of a support wire near the lamp electrode attached.

Die Zusammenfassung der japanischen Offenlegungsschrift JP-A-60-133649, veröffentlicht im Patent Abstracts of Japan, Vol. 9, No 295, offenbart eine Niederdruckentladungslampe mit einer Tellerrohreinschmelzung für eine der Lampenelektroden. Die Tellerrohreinschmelzung weist einen Pumpstengel mit einem abgedichteten Ende und mit einem zum Entladungsraum offenen Ende auf. Innerhalb des Pumpstengels ist, nahe dem abgedichteten Ende, ein Amalgam bzw. ein Amalgambildner angeordnet. In das offene Ende des Pumpstengels ist ein rohrartiges Element eingesetzt, das mittels eines angeformten Dumet-Drahtes einen nahe bei der Lampenelektrode angeordneten Quecksilbergetter trägt.The abstract of Japanese Patent Application Laid-Open JP-A-60-133649, published in Patent Abstracts of Japan, Vol. 9, No 295, discloses a low-pressure discharge lamp with a plate tube melting for one of the lamp electrodes. The plate tube melting has a pump stem with a sealed end and with an end open to the discharge space. Inside the pedicle is an amalgam near the sealed end Amalgam formers arranged. In the open end of the pedicle is a tubular element is used, which is formed by means of a Dumet wire one located close to the lamp electrode Mercury getter carries.

Es ist die Aufgabe der Erfindung, eine Niederdruckentladungslampe gemäß dem Oberbegriff des Patentanspruchs 1 mit einem verbesserten Amalgamträger bereitzustellen, der sowohl für Lampen mit Tellerrohreinschmelzungen als auch für Lampen, deren Elektrodengestelle mittels einer Glasperle bzw. mittels eines Glasstabes stabilisiert sind und deren Entladungsgefäßenden über den Stromzuführungen dicht gequetscht sind, geeignet ist.It is the object of the invention to provide a low-pressure discharge lamp according to the preamble of claim 1 with an improved Provide amalgam carrier, which is suitable both for lamps with plate tube melts as well as for lamps whose electrode racks are stabilized by means of a glass bead or by means of a glass rod and the discharge vessel ends tight above the power supply lines are squeezed, is suitable.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Besonders vorteilhafte Ausführungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the characterizing Features of claim 1 solved. Particularly advantageous Embodiments of the invention are described in the subclaims.

Die erfindungsgemäße Niederdruckentladungslampe besitzt einen Trägerkörper für das Anlauf-Amalgam, der unmittelbar in einem zum Elektrodengestell gehörenden Glaskörper eingeschmolzen oder an diesem angeschmolzen ist. Dazu wird der Trägerkörper in das noch weiche Glas des Glaskörpers eingestochen oder aber an den Glaskörper angeglast. Nach dem Erkalten des Glases ist der Amalgam-Trägerkörper auf einfache und zuverlässige The low-pressure discharge lamp according to the invention has a Carrier body for the start-up amalgam, which immediately in one to Glass body belonging to the electrode frame is melted or attached this has melted. For this, the carrier body is still in the pierced soft glass of the vitreous or on the vitreous glass. After the glass has cooled, the amalgam carrier body in simple and reliable

Weise in bzw. an dem Glaskörper fixiert. Der Trägerkörper kann auf diese Weise sowohl in einem aus Glas bestehenden Tellerrohrfuß als auch in einer das Elektrodengestell stabilisierenden Glasperle bzw. Glasstab befestigt werden. Als Trägerkörper für das Amalgam eignet sich besonders vorteilhaft ein mit einem Amalgambildner beschichtetes Metallblech oder Metallgitter. Ein simpler mit Amalgambildner beschichteter Metalldraht kommt ebenfalls als Trägerkörper in Frage. Der erfindungsgemäße Amalgam-Trägerkörper kann derart plaziert werden, daß sich die heißeste Stelle des Elektrodengestells auf dem Trägerkörper selbst befindet und dadurch ein Kriechen des Amalgambildners in Richtung der Elektrodenwendel verhindert wird.Fixed in or on the vitreous. The carrier body can be on this Both in a plate tube base made of glass and in one attached the electrode frame stabilizing glass bead or glass rod become. The carrier body for the amalgam is particularly advantageous a metal sheet or metal grid coated with an amalgam former. A simple metal wire coated with amalgam former comes also as a carrier body in question. The amalgam carrier body according to the invention can be placed so that the hottest part of the electrode rack located on the carrier body itself and thereby creeping of the amalgam generator in the direction of the electrode coil prevented becomes.

Nachstehend wird die Erfindung anhand zweier Ausführungsbeispiele näher erläutert. Es zeigen:

Figur 1
Eine schematische Darstellung eines Entladungsgefäßendes (ohne Sockel) der erfindungsgemäßen Niederdruckentladungslampe entsprechend des ersten Ausführungsbeispiels
Figur 2
Eine schematische Darstellung (teilweise geschnitten) eines Entladungsgefäßendes (ohne Sockel) der erfindungsgemäßen Niederdruckentladungslampe entsprechend des zweiten Ausführungsbeispiels
The invention is explained in more detail below with the aid of two exemplary embodiments. Show it:
Figure 1
A schematic representation of a discharge vessel end (without base) of the low-pressure discharge lamp according to the invention in accordance with the first exemplary embodiment
Figure 2
A schematic representation (partially sectioned) of a discharge vessel end (without base) of the low-pressure discharge lamp according to the invention in accordance with the second exemplary embodiment

In der Figur 1 ist ein Entladungsgefäßende einer Niederdruckentladungslampe, insbesondere einer kompakten Leuchtstofflampe, gemäß des ersten Ausführungsbeispiels der Erfindung schematisch abgebildet. Diese Lampe besitzt ein rohrförmiges Entladungsgefäß 1 aus Glas, das an seinen Enden mittels einer Quetschdichtung 2 gasdicht verschlossen ist. Aus der Quetschdichtung 2 ragen zwei Stromzuführungen 3, 4 für eine innerhalb des Entladungsgefäßes 1 angeordnete Elektrodenwendel 5 heraus. Die beiden Stromzuführungen 3, 4 sind jeweils mit einem Ende der Elektrodenwendel 5 verschweißt. Sie bilden zusammen mit der Elektrodenwendel 5 und einer Glasperle 6, in der die Stromzuführungen 3, 4 eingeschmolzen sind, ein Elektrodengestell der Leuchtstofflampe. Die Glasperle 6 dient zur Fixierung der mit der Elektrodenwendel 5 verbundenen Stromzuführungen 3, 4 während der Herstellung der Quetschdichtung 2. In der Glasperle 6 ist ferner ein mit Indium beschichtetes Metallblech 7, z. B. Eisenblech, eingeschmolzen, indem es in das noch weiche Glas der Perle 6 ca. 0,3 mm tief eingestochen wurde. Die Einstechlage ist so gewählt, das sich während des Lampenbetriebs die heißeste Stelle des Elektrodengestells auf dem Eisenblech 7 befindet und so ein Kriechen des Indiums in Richtung Elektrodenwendel verhindert wird. Dazu kann das Metallblech 7 nach dem Erstarren der Glasperle 6 zusätzlich noch mechanisch gebogen werden. Die Fläche des Metallbleches beträgt ca. 2,5 × 7 mm2 und seine Dicke ca. 0,2 mm. Das in die Niederdruckentladungslampe als Füllungsbestandteil eingbrachte Quecksilber bildet mit dem Indium auf dem Metallblech 7 Indium-Amalgam, das den Anlauf der Lampe beschleunigt und daher als Hilfs- oder Anlauf-Amalgam bezeichnet wird.A discharge vessel end of a low-pressure discharge lamp, in particular a compact fluorescent lamp, according to the first exemplary embodiment of the invention is shown schematically in FIG. This lamp has a tubular discharge vessel 1 made of glass, which is sealed gas-tight at its ends by means of a pinch seal 2. Two current leads 3, 4 for an electrode coil 5 arranged inside the discharge vessel 1 protrude from the pinch seal 2. The two power supplies 3, 4 are each welded to one end of the electrode coil 5. Together with the electrode coil 5 and a glass bead 6, in which the current leads 3, 4 are melted, they form an electrode frame of the fluorescent lamp. The glass bead 6 serves to fix the current leads 3, 4 connected to the electrode coil 5 during the production of the pinch seal 2. In the glass bead 6 there is also a metal sheet 7 coated with indium, e.g. B. iron sheet, melted by being inserted into the still soft glass of the pearl 6 about 0.3 mm deep. The penetration position is selected such that the hottest point of the electrode frame is on the iron sheet 7 during lamp operation and thus prevents the indium from creeping in the direction of the electrode coil. For this purpose, the metal sheet 7 can additionally be mechanically bent after the glass bead 6 has solidified. The area of the metal sheet is approximately 2.5 × 7 mm 2 and its thickness is approximately 0.2 mm. The mercury introduced into the low-pressure discharge lamp as a filling component forms indium amalgam with the indium on the metal sheet 7, which accelerates the start-up of the lamp and is therefore referred to as auxiliary or start-up amalgam.

In der Figur 2 ist das ungesockelte Entladungsgefäßende einer Niederdruckentladungslampe gemäß eines zweiten Ausführungsbeispiels der Erfindung dargestellt. Diese Lampe besitzt ein rohrartiges Entladungsgefäß 1' aus Glas, dessen Enden jeweils mittels einer Tellerrohreinschmelzung 6' gasdicht verschlossen sind. Aus dem Entladungsgefäßende ragen zwei Stromzuführungen 3', 4' heraus, die jeweils mit einem Ende einer innerhalb des Entladungsgfäßes 1' angeordeten Wendelelektrode 5' elektrisch leitend verbunden sind. Bei der Tellerrohreinschmelzung 6' handelt es sich um ein Glasrohr - Tellerrohr genannt -, durch das die Stromzuführungen 3', 4' und das Pumpstengel 8' hindurchgefädelt sind. Das obere Ende 6a' dieses Tellerrohrs 6' ist über den Stromzuführungen 3', 4' und dem Pumpstengel 8' dichtgequetscht, während das untere Ende 6b' trichterartig zu einem Teller erweitert und mit dem Entladungsgefäßende gasdicht verschmolzen ist. Die Quetschdichtung 6a' des Tellerrohrs 6' bildet zusammen mit den Stromzuführungen 3', 4' und der Elektrodenwendel 5' ein Elektrodengestell der Niederdruckentladungslampe. Im Quetschdichtungsbereich 6a' der Tellerrohreinschmelzung 6' ist erfindungsgemäß ein mit Indium beschichtetes Metallblech 7' teilweise eingeschmolzen, indem es in das noch nicht vollständig erstarrte Glas des Tellerohrs 6a' ca. 0,3 mm tief eingestochen wurde. Die Abmessungen dieses Metallbleches betragen ca. 2,5 x 7 x 0,2 mm3. Das in die Niederdruckentladungslampe als Füllungsbestandteil eingbrachte Quecksilber bildet mit dem Indium auf dem Metallblech 7' Indium-Amalgam, das den Anlauf der Lampe beschleunigt. FIG. 2 shows the unsocked discharge vessel end of a low-pressure discharge lamp according to a second exemplary embodiment of the invention. This lamp has a tube-like discharge vessel 1 'made of glass, the ends of which are each sealed gas-tight by means of a plate tube melt 6'. Two current leads 3 ', 4' protrude from the discharge vessel end, each of which is electrically conductively connected to one end of a spiral electrode 5 'arranged inside the discharge vessel 1'. The plate tube melt 6 'is a glass tube - called a plate tube - through which the current leads 3', 4 'and the pump stem 8' are threaded. The upper end 6a 'of this plate tube 6' is tightly squeezed over the current leads 3 ', 4' and the pump stem 8 ', while the lower end 6b' is funnel-shaped to form a plate and is sealed gas-tight with the discharge vessel end. The pinch seal 6a 'of the plate tube 6' forms, together with the current leads 3 ', 4' and the electrode coil 5 ', an electrode frame of the low-pressure discharge lamp. According to the invention, an indium-coated metal sheet 7 'is partially melted in the pinch seal area 6a' of the plate tube melt 6 'by being inserted into the glass of the plate tube 6a', which is not yet completely solid, about 0.3 mm deep. The dimensions of this metal sheet are approximately 2.5 x 7 x 0.2 mm 3 . The mercury introduced into the low-pressure discharge lamp as a filling component forms indium amalgam with the indium on the metal sheet 7 ′, which accelerates the start-up of the lamp.

Die Erfindung beschränkt sich nicht auf die oben näher beschriebenen Ausführungsbeispiele. Als Trägerkörper für das Amalgam können neben Eisenblech auch auch andere Bleche aus hochschmelzenden Metallen, verwendet werden. Außerdem eignen sich als Trägerkörper anstelle von Blechen auch andersartig geformte, mit einem Amalgambildner beschichtete Metallkörper, beispielsweise Metallgitter oder Metalldrähte, die in die Glasperle bzw. in das Tellerrohr teilweise eingeschmolzen sind. Die Größe des Trägerkörpers ist im wesentlichen nur durch den Durchmesser des Entladungsgefäßes begrenzt. Als Amalgambildner kommen neben Indium auch andere Metalle wie z. B. Cadmium in Frage. Die Größe des Trägerkörpers sowie die Schichtdicke des Amalgambildners auf dem Trägerkörper und damit auch die Amalgambildnermenge hängen vom jeweiligen Lampentyp ab.The invention is not limited to the exemplary embodiments described in more detail above. In addition to sheet iron, the support body for the amalgam can be other sheets of high-melting metals are also used become. Also suitable as a support body instead of sheets also differently shaped metal bodies coated with an amalgam former, For example, metal grids or metal wires that run into the glass bead or are partially melted into the plate tube. The size of the Carrier body is essentially only by the diameter of the Discharge vessel limited. In addition to indium come as amalgam formers other metals such as B. Cadmium in question. The size of the Carrier body and the layer thickness of the amalgam former on the carrier body and thus also the amount of amalgam form depends on the respective Lamp type.

Claims (3)

  1. Low-pressure discharge lamp having a discharge vessel (1; 1') closed in gas-tight fashion, having a starting amalgam and having at least two electrode frames which in each case have, in addition to an electrode coil (5; 5'), two lead-in wires (3, 4; 3', 4') connected to the coil ends and a glass body (6; 6') in which the lead-in wires (3, 4; 3', 4') are sealed in or pinched in, the starting amalgam being arranged on at least one support body (7; 7'), characterized in that the support body (7; 7') is a metal body which is coated with an amalgamating partner and is either a metal plate, metal grid or metal wire, part of this metal body (7; 7') being embedded in one of the glass bodies (6; 6') and sealed in.
  2. Low-pressure discharge lamp according to Claim 1, characterized in that the glass bodies are formed as glass beads (6) or as glass rods, in which the lead-in wires (3, 4) belonging to the respective electrode frames are sealed in.
  3. Low-pressure discharge lamp according to Claim 1, characterized in that the glass bodies are formed as stem-tube seals (6') which are fused to the discharge vessel ends and seal the latter in gas-tight fashion.
EP95119041A 1994-12-20 1995-12-04 Low pressure discharge lamp Expired - Lifetime EP0718869B1 (en)

Applications Claiming Priority (2)

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DE4445532 1994-12-20
DE4445532A DE4445532A1 (en) 1994-12-20 1994-12-20 Low pressure discharge lamp

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EP0718869A1 EP0718869A1 (en) 1996-06-26
EP0718869B1 true EP0718869B1 (en) 1999-02-24

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JP (1) JPH08236073A (en)
KR (1) KR960026060A (en)
CN (1) CN1132926A (en)
CA (1) CA2162339A1 (en)
DE (2) DE4445532A1 (en)
HU (1) HU216848B (en)

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EP2197021A1 (en) 2008-12-10 2010-06-16 Osram Gesellschaft mit Beschränkter Haftung Electricity supply element for an electrode and electrode assembly with at least one such electricity supply element
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ITMI20112111A1 (en) 2011-11-21 2013-05-22 Getters Spa LAMP CONTAINING AN IMPROVED STARTING AMALGAMINE

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DE59505144D1 (en) 1999-04-01
HU216848B (en) 1999-09-28
CN1132926A (en) 1996-10-09
US5686788A (en) 1997-11-11
EP0718869A1 (en) 1996-06-26
HUT73123A (en) 1996-06-28
KR960026060A (en) 1996-07-20
HU9503651D0 (en) 1996-02-28
DE4445532A1 (en) 1996-06-27
JPH08236073A (en) 1996-09-13
CA2162339A1 (en) 1996-06-21

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