EP0118834B1 - Low-pressure discharge lamp with one-sided lamp base and its method of manufacture - Google Patents

Low-pressure discharge lamp with one-sided lamp base and its method of manufacture Download PDF

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Publication number
EP0118834B1
EP0118834B1 EP84102131A EP84102131A EP0118834B1 EP 0118834 B1 EP0118834 B1 EP 0118834B1 EP 84102131 A EP84102131 A EP 84102131A EP 84102131 A EP84102131 A EP 84102131A EP 0118834 B1 EP0118834 B1 EP 0118834B1
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EP
European Patent Office
Prior art keywords
lamp
rim
bottom part
glass
pressure discharge
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
Application number
EP84102131A
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German (de)
French (fr)
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EP0118834A1 (en
Inventor
Gerhard Dr. Steeger
Josef Plischke
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0118834A1 publication Critical patent/EP0118834A1/en
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Publication of EP0118834B1 publication Critical patent/EP0118834B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H01J61/327—"Compact"-lamps, i.e. lamps having a folded discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/52—Means forming part of the tube or lamps for the purpose of providing electrical connection to it directly applied to or forming part of the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/34—Joining base to vessel

Definitions

  • the invention relates to a low-pressure discharge lamp with a base on one side, which has a base part, a gas-tight and / or metal-vapor filling, with a base and an outer bulb, which is connected to it in a gas-tight manner, two preheatable electrodes which are provided with power supplies and are arranged on the base part within the outer bulb, and one or two also has inside the outer bulb arranged U-shaped inner tubes made of glass, the first end of one of the straight legs of each inner tube gas-tightly enclosing the power supply lines of one of the preheatable electrodes and the second end of the other straight leg of each inner tube having an opening which is in the vicinity of the Base part is arranged.
  • Lamps with such a construction are referred to as compact lamps because of their greatly shortened construction compared to conventional low-pressure discharge lamps.
  • these lamps can be operated in standard incandescent lamp holders.
  • Such compact lamps are therefore suitable with a corresponding design for the direct replacement of incandescent lamps. Due to their higher efficiency for converting the absorbed electrical energy into visible light and due to their longer lifespan, compact lamps are more economical than incandescent lamps. Despite this clear advantage, compact lamps have so far not been able to prevail.
  • a single-ended low-pressure discharge lamp in which in an outer bulb at least one gas-tight enclosing a preheatable electrode with the first end and with the other end having an opening towards the lamp bulb U-shaped inner tube is arranged.
  • the gas-tight fusion between the U-shaped inner tube and the preheatable electrode on the one hand and the outer bulb surrounding the gas filling on the other hand takes place by means of a fusion glass and a chrome iron plate serving as a foot part.
  • the soldering of all parts with this fusion glass requires a complex and therefore relatively expensive manufacturing technique. In addition, this process is less suitable for the production of large quantities on fully automatic machines due to the frequent soldering errors.
  • EP-A-0 076 503 proposed a low-pressure discharge lamp with a base on one side, in which a preformed plate according to the present invention was used to produce the melt.
  • This document falls under Article 54 (3) EPC and it should be noted that this document is not relevant to the question of inventive step.
  • the preformed plate used here is arranged with its elongated, round receiving part at the top, so that after the electrodes and the inner tubes have melted, it faces the interior of the lamp.
  • the outward-facing edge of the plate, fused to the outer bulb, points downward and forms the fastening option for the lamp base.
  • the object of the invention is to provide a low-pressure discharge lamp of the type mentioned at the beginning which, as a compact lamp with low power consumption, is comparable in terms of shape, size and light output to an incandescent lamp and can therefore be used in existing lamps.
  • the lamp construction should enable production on machines with high performance in order to be able to offer the end product at a reasonable price.
  • the base sleeve should cover the electrode spaces of the inner tubes and the free discharge path at the same time.
  • a low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that both the electrodes and the openings are arranged below the upper base edge and thus invisibly, and that the base made of glass consists of an upper, outward and concentric to Arranged longitudinally of the lamp, the fusion with the outer bulb and consisting of a lower, longitudinally round receiving part directed towards the base of the lamp and a hollow cylindrical middle part connecting the inner edge of the edge to the receiving part, the diameter of which is smaller than the diameter of the edge and the same size as the length of the receiving part, wherein the power leads of the preheatable electrodes and the first end of each U-shaped interior tubes are melted into the receiving part.
  • the operating voltage of the lamp and thus its power consumption is advantageously increased by lengthening the discharge path by assigning a U-shaped inner tube to each of the two preheatable electrodes.
  • the longitudinal axes of the straight legs of both U-shaped inner tubes essentially form the corner points of a rhombus or a square, the diagonals of which form an intersection lying on the lamp longitudinal axis.
  • the gas-tight melting of the first ends of the U-shaped inner tubes with the current leads of the preheatable electrodes and the upper receiving part of the preformed plate directed towards the lamp interior is designed according to the invention in the form of a pinch, the length of the pinch roughly corresponding to the length of the receiving part.
  • this lower receiving part of the plate which receives the first ends of the U-shaped inner tubes, has an elongated round opening, the clear width of which is somewhat larger than the outer diameter of the inner tubes.
  • the sections connecting the semicircular end pieces of the elongated round opening can be drawn in to the longitudinal axis of the lamp, so that the shape of a figure eight approximates in the bottom view.
  • the upper, outward-facing plate rim is circular and concentric with the longitudinal axis of the lamp, the diameter of which is adapted to the inside diameter of the outer bulb, which is preferably light-scattering. The gas-tight fusion of these two parts can largely take place on conventional melting machines for incandescent lamps.
  • the central part connecting the elongated, round receiving part and the concentric edge of the preformed plate is designed as a hollow cylinder.
  • the diameter of the middle part is the same size as the length of the receiving part and smaller than the diameter of the edge of the preformed plate.
  • the discharge vessel consisting of outer bulbs and in particular the U-shaped inner tubes. preferably contains mercury and an inert gas as filling.
  • an amalgam-forming substance can be applied inside, in the vicinity of the closed end. This has the effect that the mercury which has migrated into the outer bulb as a result of the thermal conditions occurring during operation is recirculated in a constant dynamic process, so that the entire volume of the inner tube or tubes is filled uniformly with mercury vapor.
  • the UV radiation generated by the low-pressure discharge is converted into visible radiation by corresponding phosphor coatings on the inner surface of the inner tubes and, if appropriate, on the inner surface of the outer bulb. It has proven to be advantageous to use a so-called three-band phosphor, which is red. contains green and blue emitting individual components.
  • the coating of the outer bulb insofar as it has not been provided with a phosphor layer, different embodiments are possible. As is common with incandescent lamps, a clear glass or a light-scattering surface, such as. B. an internal matting or a siliconized coating possible.
  • the outer bulb is provided at the electrode end with a base via which the lamp is electrically connected.
  • An electrical screw base is advantageously used, which can be used in conventional incandescent lamp holders.
  • the lamp can also be equipped with any other base.
  • the lamp can be operated in any corresponding bulb holder.
  • the lamp according to the invention can also be operated via a conventional ballast choke which, for. B. executed as an adapter to the lamp or is part of the lamp.
  • the low-pressure discharge lamp is produced in a simple manner.
  • the preformed plate the production of which was described in detail in EP-A-0 076 503 cited above, plays a major part in this.
  • a frame provided with the preheatable electrodes advantageously has one-piece power supplies, which, for. B. can be held by means of a pearl base.
  • racks held in a receptacle are also conceivable during the melting process.
  • multi-part power supplies can also be used.
  • the preformed plate is placed with its edge up over two of these frames, which are held at a defined distance.
  • the two U-shaped inner tubes are then guided from above into the lower, elongated, round part of the preformed plate in such a way that their first ends, which are not coated with fluorescent material, surround the frames.
  • the parts assembled in this way are heated in the region of the receiving part of the plate to a temperature suitable for the deformation of the glass.
  • both vessel seals of the U-shaped inner tubes are produced in a single operation.
  • the further processing to the finished lamp is largely carried out according to known work steps.
  • the outer bulb is fused with the upper edge of the plate, which is arranged concentrically to the lamp axis, on a melting machine with neck waste, or the piston neck, which has been brought to the deformation temperature, is pressed against the heated edge of the plate by means of a roller. After pumping. The lamp is ready to fill and base.
  • the low-pressure discharge lamp according to the invention has a gu te lighting properties.
  • the interior structure described above is simple both in terms of construction and production technology and results in a sufficient length of the discharge path.
  • the use of the preformed plate with the melting edge upwards has the advantage over its reversed use according to the melting method already proposed that both the electrodes and the free part of the discharge are arranged transversely through the outer bulb below the base edge and thus invisibly.
  • the usable discharge path is also extended, which means that a lamp bulb of the same size compared to the known compact lamps achieves a higher lamp output.
  • an additional usable space is created to the left and right of the bruise, in which, for. B. a ballast and ignition device can be accommodated.
  • the preformed plate 1 shown in FIGS. 1 and 2 has an upper, outwardly directed edge 3, which is circular in plan view and forms the future line of fusion with the outer bulb.
  • the lower receiving part 2 which faces the base in the finished lamp, has the cross-sectional shape of an elongated, round opening. This opening is provided for receiving the first ends of the U-shaped inner tubes.
  • the clear width B is adapted to the outer diameter of the inner tubes and the length L corresponds approximately to the length of the subsequent crushing.
  • the sections connecting the semicircular end pieces of the elongated round opening have constrictions 16 to the longitudinal axis of the lamp, which approximately results in the shape of an eight.
  • the middle part 4 between the receiving part 2 and the edge 3 is formed by a substantially hollow cylindrical piece, the diameter of which is smaller than that of the edge 3 and the same length as the length L of the receiving part 2.
  • the height of the plate 1 is approximately 25 mm and the edge 3 has a diameter of approximately 37 mm to 40 mm.
  • the diameter of the hollow cylindrical middle part is approximately 30 mm.
  • FIG. 3 shows a U-shaped inner tube 5 with two straight legs 6 and 7.
  • the first leg 6 is approximately 10 mm longer than the other leg 7.
  • the extended end 8 of the first leg 6 is provided for insertion into the receiving part 2 of the plate 1 and does not have a fluorescent coating.
  • the other leg 7 has a remaining opening 9 at its lower end.
  • the inner tube 5 has an outer diameter of approximately 12 mm. With a wall thickness of approx. 1.0 mm, the inner diameter is approx. 10.0 mm. There is a free space of approximately 3 mm between the legs 6 and 7.
  • the basic assembly preassembled in FIG. 4 illustrates the arrangement of two identical, U-shaped inner tubes 5 and 5 'coated with phosphor in the receiving part 2 of the plate 1 in a plan view.
  • the four legs 6, 7 and 6 ', 7' run parallel to one another, their longitudinal axes forming the corner points of a rhombus or a square.
  • the diagonals D and D 'connecting the corner points intersect in the lamp longitudinal axis.
  • the preheatable electrodes (not shown) which have a perifusion are located within the legs 6 and 6 '.
  • the preassembled basic structure held in this way is heated and crushed along the length L of the elongated, round opening of the receiving part 2.
  • a pump tube (not shown) arranged in the longitudinal axis of the lamp is squeezed into the receiving part 2 from the underside of the plate 1.
  • a tubular outer bulb 10 with an outer diameter of approximately 38 mm to approximately 50 mm is then put over the crimped, pre-assembled basic structure from FIG. which is fused to the upper edge 3 of the plate 1.
  • This production stage is shown in FIG. 5.
  • the power supplies 13 and 13 ' can be made in one or more parts.
  • a copper sheathed wire is particularly suitable as the material.
  • the pump tube 11 is melted close to the lower part of the pinch of the plate 1 and provided with a base 14, as shown in FIG. 6.
  • a base 14 for direct connection to the network - e.g. B. in exchange for an incandescent lamp - can be integrated in the base sleeve 15, an electronic ignition and ballast.
  • a low-pressure discharge lamp according to the invention has a discharge length of approximately 460 mm through the two U-shaped inner tubes.
  • the compact lamp contains mercury in a quantity of approx. 10 mg and approx. 300 Pa argon. With a supplied power of approx. 16 W, the lamp has an operating voltage of approx. 95 V and a lamp current of approx. 200 mA.
  • the luminous flux is around 1 000 Im.

Description

Die Erfindung betrifft eine einseitig gesockelte Niederdruckentladungslampe, die einen Fußteil, einen mit diesem gasdicht verbundenen, eine Gas- und/oder Metalldampffüllung enthaltenden, mit einem Sockel versehenen Außenkolben, zwei mit Stromzuführungen versehene, innerhalb des Außenkolbens am Fußteil angeordnete vorheizbare Elektroden sowie ein oder zwei ebenfalls innerhalb des Außenkolbens angeordnete U-förmige Innenrohre aus Glas aufweist, wobei das erste Ende eines der geraden Schenkel jedes Innenrohres die Stromzuführungen einer der vorheizbaren Elektroden gasdicht umschließt und das zweite Ende des anderen geraden Schenkels jedes Innenrohres eine Öffnung aufweist, die in der Nähe des Fußteils angeordnet ist.The invention relates to a low-pressure discharge lamp with a base on one side, which has a base part, a gas-tight and / or metal-vapor filling, with a base and an outer bulb, which is connected to it in a gas-tight manner, two preheatable electrodes which are provided with power supplies and are arranged on the base part within the outer bulb, and one or two also has inside the outer bulb arranged U-shaped inner tubes made of glass, the first end of one of the straight legs of each inner tube gas-tightly enclosing the power supply lines of one of the preheatable electrodes and the second end of the other straight leg of each inner tube having an opening which is in the vicinity of the Base part is arranged.

Lampen mit einen derartigen Konstruktionsaufbau werden aufgrund ihrer gegenüber herkömmlichen Niederdruckentladungslampen stark verkürzten Bauforn als Kompaktlampen bezeichnet. Mit einem Vorschaltgerät sowie einem Zündelement versehen und einem Schraubsockel ausgestattet, lassen sich diese Lampen in üblichen Glühlampenfassungen betreiben. Solche Kompaktlampen sind daher bei entsprechender Konstruktion für den direkten Ersatz von Glühlampen geeignet. Infolge ihres höheren Wirkungsgrades für die Umsetzung der aufgenommenen elektrischen Energie in sichtbares Licht und aufgrund ihrer längeren Lebensdauer sind Kompaktlampen wirtschaftlicher als Glühlampen. Trotz dieses klaren Vorteils konnten sich Kompaktlampen bisher nicht durchsetzen. Zum einen sind die bisher vorgeschlagenen Konstruktionen noch zu aufwendig, wodurch die Herstellungskosten ansteigen und damit auch der Anschaffungspreis für den Endverbraucher oberhalb der Schwelle der Kaufbereitschaft liegt, zum anderen ist bei den Lampen mit einfacherer Konstruktion die abgegebene Lichtleistung noch nicht befriedigend. Das allgemeine Bestreben bei der Entwicklung von Kompaktlampen geht dahin, eine hohe Lichtabgabe und gute Farbwiedergabe bei möglichst glühlampenähnlicher Größe, Form und Preisgestaltung zu erreichen.Lamps with such a construction are referred to as compact lamps because of their greatly shortened construction compared to conventional low-pressure discharge lamps. Provided with a ballast and an ignition element and equipped with a screw base, these lamps can be operated in standard incandescent lamp holders. Such compact lamps are therefore suitable with a corresponding design for the direct replacement of incandescent lamps. Due to their higher efficiency for converting the absorbed electrical energy into visible light and due to their longer lifespan, compact lamps are more economical than incandescent lamps. Despite this clear advantage, compact lamps have so far not been able to prevail. On the one hand, the previously proposed designs are still too complex, which increases the manufacturing costs and thus the purchase price for the end user is above the threshold of willingness to buy, on the other hand, the output of light output is not yet satisfactory for lamps with a simpler design. The general aim in the development of compact lamps is to achieve high light output and good color rendering with the size, shape and pricing that is as similar as possible to incandescent lamps.

Aus der DE-A-28 35 574 ist z. B. eine einseitig gesockelte Niederdruckentladungslampe bekannt, bei der in einem Außenkolben mindestens ein mit dem ersten Ende eine vorheizbare Elektrode gasdicht umschließendes und mit dem anderen Ende eine Öffnung zum Lampenkolben hin aufweisendes U-förmiges Innenrohr angeordnet ist. Die gasdichte Verschmelzung zwischen U-förmigem Innenrohr und vorheizbarer Elektrode einerseits sowie den die Gasfüllung umschließenden Außenkolben andererseits erfolgt dabei mittels eines Schmelzverbindungsglases und einer als Fußteil dienenden Chromeisenplatte. Das Verlöten aller Teile mit diesem Schmelzverbindungsglas erfordert eine aufwendige und damit relativ teure Herstellungstechnik. Zudem ist dieses Verfahren für die Herstellung großer Mengen auf vollautomatischen Maschinen wegen der häufig auftretenden Lötfehler weniger geeignet.From DE-A-28 35 574 z. B. a single-ended low-pressure discharge lamp is known, in which in an outer bulb at least one gas-tight enclosing a preheatable electrode with the first end and with the other end having an opening towards the lamp bulb U-shaped inner tube is arranged. The gas-tight fusion between the U-shaped inner tube and the preheatable electrode on the one hand and the outer bulb surrounding the gas filling on the other hand takes place by means of a fusion glass and a chrome iron plate serving as a foot part. The soldering of all parts with this fusion glass requires a complex and therefore relatively expensive manufacturing technique. In addition, this process is less suitable for the production of large quantities on fully automatic machines due to the frequent soldering errors.

Des weiteren wurde in der EP-A-0 076 503 eine einseitig gesockelte Niederdruckentladungslampe vorgeschlagen, bei der zur Herstellung der Einschmelzung ein vorgeformter Teller entsprechend der vorliegenden Erfindung verwendet wurde. Dieses Dokument fällt unter Artikel 54 (3) EPÜ und es sei darauf hingewiesen, daß dieses Dokument für die Frage der erfinderischen Tätigkeit nicht von Bedeutung ist. Der hierbei verwendete vorgeformte Teller ist mit seinem länglichrunden Aufnahmeteil oben angeordnet, so daß dieser nach dem Einschmelzen der Elektroden und der Innenrohre dem Lampeninnern zugewandt ist. Der mit dem Außenkolben verschmolzene, nach außen gerichtete Rand des Tellers weist nach unten und bildet die Befestigungsmöglichkeit für den Lampensockel.Furthermore, EP-A-0 076 503 proposed a low-pressure discharge lamp with a base on one side, in which a preformed plate according to the present invention was used to produce the melt. This document falls under Article 54 (3) EPC and it should be noted that this document is not relevant to the question of inventive step. The preformed plate used here is arranged with its elongated, round receiving part at the top, so that after the electrodes and the inner tubes have melted, it faces the interior of the lamp. The outward-facing edge of the plate, fused to the outer bulb, points downward and forms the fastening option for the lamp base.

Beide Konstruktionen der Kompaktlampen weisen den gemeinsamen Nachteil auf, daß die Elektroden oberhalb des Sockelrandes liegen, wodurch die üblicherweise nach längerer Brenndauer schwarz gewordenen Elektrodenräume sichtbar sind. Außerdem liegen die offenen Enden der U-förmigen Innenrohre ebenfalls oberhalb des Sockelrandes. Bei nicht mit einer Leuchtstoffschicht versehenen Außenkolben ist hier die freie, den Außenkolben durchquerende blaue Quecksilberentladung sichtbar.Both designs of the compact lamps have the common disadvantage that the electrodes lie above the base edge, as a result of which the electrode spaces which have usually become black after a long burning time are visible. In addition, the open ends of the U-shaped inner tubes are also above the base edge. If the outer bulb is not provided with a fluorescent layer, the free blue mercury discharge crossing the outer bulb is visible here.

Aufgabe der Erfindung ist es, eine einseitig gesockelte Niederdruckentladungslampe der eingangs erwähnten Art zu schaffen, die als Kompaktlampe kleiner Leistungsaufnahme in bezug auf Form, Größe und Lichtabgabe mit einer Glühlampe vergleichbar und damit in bestehenden Leuchten verwendbar ist. Die Lampenkonstruktion soll eine Fertigung auf Maschinen mit hoher Leistung ermöglichen, um das Endprodukt preisgünstig anbieten zu können. Die Sockelhülse soll dabei gleichzeitig die Elektrodenräume der Innenrohre sowie die freie Entladungsstrecke abdecken.The object of the invention is to provide a low-pressure discharge lamp of the type mentioned at the beginning which, as a compact lamp with low power consumption, is comparable in terms of shape, size and light output to an incandescent lamp and can therefore be used in existing lamps. The lamp construction should enable production on machines with high performance in order to be able to offer the end product at a reasonable price. The base sleeve should cover the electrode spaces of the inner tubes and the free discharge path at the same time.

Eine Niederdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen ist erfindungsgemäß dadurch gekennzeichnet, daß sowohl die Elektroden als auch die Öffnungen unterhalb des oberen Sockelrandes und damit unsichtbar angeordnet sind, und daß das aus Glas bestehende Fußteil aus einem oberen, nach außen gerichteten und konzentrisch zur Lampenlängsachse angeordneten, die Verschmelzung mit dem Außenkolben bildenden Rand und aus einem unteren, zum Sockel der Lampe gerichteten Aufnahmeteil länglichrunden Querschnitts sowie einem die Randinnenkante mit dem Aufnahmeteil verbindenden, hohlzylindrischen Mittelteil besteht, dessen Durchmesser kleiner als der Durchmesser des Randes und gleich groß wie die Länge des Aufnahmeteils ist, wobei die Stromzuführungen der vorheizbaren Elektroden sowie das erste Ende jedes U-förmigen Innenrohres in das Aufnahmeteil eingeschmolzen sind. Die Brennspannung der Lampe und damit deren Leistungsaufnahme wird durch eine Verlängerung der Entladungsbahn vorteilhaft erhöht, indem man jeder der zwei vorheizbaren Elektroden ein U-förmiges Innenrohr zuordnet. Die Längsachsen der geraden Schenkel beider U-förmiger Innenrohre bilden dabei in der Draufsicht im wesentlichen die Eckpunkte einer Raute oder eines Quadrats, dessen Diagonalen einen auf der Lampenlängsachse liegenden Schnittpunkt bilden. Die gasdichte Einschmelzung der ersten Enden der U-förmigen Innenrohre mit den Stromzuführungen der vorheizbaren Elektroden und dem oberen, zum Lampeninnern gerichteten Aufnahmeteil des vorgeformten Tellers ist erfindungsgemäß in Form einer Quetschung ausgebildet, wobei die Länge der Quetschung etwa der Länge des Aufnahmeteils entspricht. Dieser die ersten Enden der U-förmigen Innenrohre aufnehmende untere Aufnahmeteil des Tellers weist vor dem Quetschvorgang eine länglichrunde Öffnung auf, deren lichte Breite etwas größer als der Außendurchmesser der Innenrohre ist. In einer besonderen Ausgestaltung der Erfindung können die die halbrunden Endstücke der länglichrunden Öffnung verbindenden Teilstücke zur Lampenlängsachse eingezogen sein, so daß in der Unteransicht angenähert die Form einer Acht entsteht. Der obere, nach außen gerichtete Tellerrand ist kreisförmig und konzentrisch zur Lampenlängsachse ausgebildet, wobei dessen Durchmesser an den Innendurchmesser des vorzugsweise lichtstreuend ausgeführten Außenkolbens angepaßt ist. Die gasdichte Verschmelzung dieser beiden Teile kann weitgehend auf konventionellen Einschmelzmaschinen für Glühlampen erfolgen. Der den länglichrunden Aufnahmeteil und den konzentrischen Rand des vorgeformten Tellers verbindende Mittelteil ist hohlzylindrisch gestaltet. Der Durchmesser des Mittelteils ist gleich groß wie die Länge des Aufnahmeteils und kleiner als der Durchmesser des Randes des vorgeformten Tellers.A low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that both the electrodes and the openings are arranged below the upper base edge and thus invisibly, and that the base made of glass consists of an upper, outward and concentric to Arranged longitudinally of the lamp, the fusion with the outer bulb and consisting of a lower, longitudinally round receiving part directed towards the base of the lamp and a hollow cylindrical middle part connecting the inner edge of the edge to the receiving part, the diameter of which is smaller than the diameter of the edge and the same size as the length of the receiving part, wherein the power leads of the preheatable electrodes and the first end of each U-shaped interior tubes are melted into the receiving part. The operating voltage of the lamp and thus its power consumption is advantageously increased by lengthening the discharge path by assigning a U-shaped inner tube to each of the two preheatable electrodes. In plan view, the longitudinal axes of the straight legs of both U-shaped inner tubes essentially form the corner points of a rhombus or a square, the diagonals of which form an intersection lying on the lamp longitudinal axis. The gas-tight melting of the first ends of the U-shaped inner tubes with the current leads of the preheatable electrodes and the upper receiving part of the preformed plate directed towards the lamp interior is designed according to the invention in the form of a pinch, the length of the pinch roughly corresponding to the length of the receiving part. Before the squeezing process, this lower receiving part of the plate, which receives the first ends of the U-shaped inner tubes, has an elongated round opening, the clear width of which is somewhat larger than the outer diameter of the inner tubes. In a special embodiment of the invention, the sections connecting the semicircular end pieces of the elongated round opening can be drawn in to the longitudinal axis of the lamp, so that the shape of a figure eight approximates in the bottom view. The upper, outward-facing plate rim is circular and concentric with the longitudinal axis of the lamp, the diameter of which is adapted to the inside diameter of the outer bulb, which is preferably light-scattering. The gas-tight fusion of these two parts can largely take place on conventional melting machines for incandescent lamps. The central part connecting the elongated, round receiving part and the concentric edge of the preformed plate is designed as a hollow cylinder. The diameter of the middle part is the same size as the length of the receiving part and smaller than the diameter of the edge of the preformed plate.

Das Entladungsgefäß, bestehend aus Außenkolben und insbesondere den U-förmigen Innenrohren. enthält als Füllung vorzugsweise Quecksilber und ein Edelgas. Bei besonders engen Innenrohren kann im Innern, in der Nähe des geschlossenen Endes eine amalgambildende Substanz angebracht sein. Dadurch wird bewirkt, daß das durch die im Betrieb auftretenden thermischen Zustände in den Außenkolben gewanderte Quecksilber in einem ständigen dynamischen Prozeß wieder zurückgeführt wird, so daß das ganze Volumen des bzw. der Innenrohre gleichmäßig mit Quecksilberdampf ausgefüllt ist. Die von der Niederdruckentladung erzeugte UV-Strahlung wird durch entsprechende Leuchtstoffbeschichtungen auf der Innenfläche der Innenrohre sowie ggf. auf der Innenoberfläche des Außenkolbens in sichtbare Strahlung umgesetzt. Es hat sich als vorteilhaft erwiesen, einen sogenannten Dreibandenleuchtstoff einzusetzen, der jeweils rot. grün und blau emittierende Einzelkomponenten enthält.The discharge vessel, consisting of outer bulbs and in particular the U-shaped inner tubes. preferably contains mercury and an inert gas as filling. In the case of particularly narrow inner tubes, an amalgam-forming substance can be applied inside, in the vicinity of the closed end. This has the effect that the mercury which has migrated into the outer bulb as a result of the thermal conditions occurring during operation is recirculated in a constant dynamic process, so that the entire volume of the inner tube or tubes is filled uniformly with mercury vapor. The UV radiation generated by the low-pressure discharge is converted into visible radiation by corresponding phosphor coatings on the inner surface of the inner tubes and, if appropriate, on the inner surface of the outer bulb. It has proven to be advantageous to use a so-called three-band phosphor, which is red. contains green and blue emitting individual components.

In bezug auf die Beschichtung des Außenkolbens, soweit dieser nicht mit einer Leuchtstoffschicht versehen wurde, sind unterschiedliche Ausführungsformen möglich. Wie bei Glühlampen gebräuchlich, ist eine Klarglas- oder eine lichtstreuende Oberfläche, wie z. B. eine Innenmattierung oder eine silizierte Beschichtung möglich.With regard to the coating of the outer bulb, insofar as it has not been provided with a phosphor layer, different embodiments are possible. As is common with incandescent lamps, a clear glass or a light-scattering surface, such as. B. an internal matting or a siliconized coating possible.

Der Außenkolben ist am elektrodenseitigen Ende mit einem Sockel versehen, über den der elektrische Anschluß der Lampe vorgenommen wird. Vorteilhaft ist ein elektrischer Schraubsockel verwendet, der in übliche Glühlampenfassungen einsetzbar ist. Die Lampe kann aber auch mit beliebigen anderen Sockeln ausgestattet sein. In Verbindung mit einem innerhalb. des Sockels angeordneten Vorschalt- und Zündgerät ist der Betrieb der Lampe in jeder entsprechenden Glühlampenfassung möglich. Die erfindungsgemäße Lampe kann jedoch auch über eine übliche Vorschaltdrossel betrieben werden, die z. B. als Adapter zu der Lampe ausgeführt oder Bestandteil der Leuchte ist.The outer bulb is provided at the electrode end with a base via which the lamp is electrically connected. An electrical screw base is advantageously used, which can be used in conventional incandescent lamp holders. The lamp can also be equipped with any other base. In conjunction with an inside. of the ballast and ignitor arranged in the base, the lamp can be operated in any corresponding bulb holder. However, the lamp according to the invention can also be operated via a conventional ballast choke which, for. B. executed as an adapter to the lamp or is part of the lamp.

Die Herstellung der Niederdruckentladungslampe erfolgt auf einfache Weise. Wesentlichen Anteil hieran trägt der vorgeformte Teller, dessen Herstellung in der oben zitierten EP-A-0 076 503 ausführlich beschrieben wurde. Bei der sich anschließenden Lampenfertigung weist ein mit den vorheizbaren Elektroden versehenes Gestell vorteilhaft einteilige Stromzuführungen auf, die z. B. mittels eines Perlfußes gehaltert sein können. Es sind jedoch ebenso während des Einschmelzvorganges in einer Aufnahme gehalterte Gestelle denkbar. Anstelle der einteiligen können auch mehrteilige Stromzuführungen verwendet werden. Über zwei dieser in definiertem Abstand gehalterten Gestelle wird der vorgeformte Teller mit seinem Rand nach oben gesetzt. Anschließend werden von oben die zwei U-förmigen Innenrohre mit jeweils ihren ersten geraden Schenkeln derart in den unteren, länglichrunden Teil des vorgeformten Tellers geführt, daß ihre nicht mit Leuchtstoff beschichteten ersten Enden die Gestelle umgeben. Die so zusammengefügten Teile werden im Bereich des Aufnahmeteils des Tellers auf eine für die Verformung des Glases geeignete Temperatur erwärmt. Während des sich nun anschließenden Quetschvorganges, bei dem auf besonders gute Positionierung aller Teile zu achten ist, werden beide Gefäßabdichtungen der U-förmigen Innenrohre in einem einzigen Arbeitsgang hergestellt.The low-pressure discharge lamp is produced in a simple manner. The preformed plate, the production of which was described in detail in EP-A-0 076 503 cited above, plays a major part in this. In the subsequent lamp production, a frame provided with the preheatable electrodes advantageously has one-piece power supplies, which, for. B. can be held by means of a pearl base. However, racks held in a receptacle are also conceivable during the melting process. Instead of the one-part power supply, multi-part power supplies can also be used. The preformed plate is placed with its edge up over two of these frames, which are held at a defined distance. The two U-shaped inner tubes, each with their first straight legs, are then guided from above into the lower, elongated, round part of the preformed plate in such a way that their first ends, which are not coated with fluorescent material, surround the frames. The parts assembled in this way are heated in the region of the receiving part of the plate to a temperature suitable for the deformation of the glass. During the subsequent squeezing process, in which care must be taken to ensure that all parts are particularly well positioned, both vessel seals of the U-shaped inner tubes are produced in a single operation.

Die Weiterverarbeitung zur fertigen Lampe erfolgt weitgehend nach bekannten Arbeitsschritten. So wird die Verschmelzung des Außenkolbens mit dem oberen, konzentrisch zur Lampenachse angeordneten Rand des Tellers auf einer Einschmelzmaschine mit Halsabfall vorgenommen oder der auf Verformungstemperatur gebrachte Kolbenhals wird mittels einer Rolle an den erwärmten Rand des Tellers angedrückt. Nach dem Pumpen. Füllen und Sockeln ist die Lampe betriebsbereit.The further processing to the finished lamp is largely carried out according to known work steps. The outer bulb is fused with the upper edge of the plate, which is arranged concentrically to the lamp axis, on a melting machine with neck waste, or the piston neck, which has been brought to the deformation temperature, is pressed against the heated edge of the plate by means of a roller. After pumping. The lamp is ready to fill and base.

Die erfindungsgemäße Niederdruckentladungslampe weist neben kompakten Abmessungen gute lichttechnische Eigenschaften auf. Der zuvor beschriebene Innenaufbau ist sowohl konstruktiv wie auch fertigungstechnisch einfach und ergibt eine ausreichende Länge des Entladungsweges. Die Verwendung des vorgeformten Tellers mit dem Einschmelzrand nach oben hat gegenüber dessen umgedrehter Verwendung nach dem bereits vorgeschlagenen Einschmelzverfahren den Vorteil, daß sowohl die Elektroden wie auch der freie Teil der Entladung quer durch den Außenkolben unterhalb des Sockelrandes und damit unsichtbar angeordnet sind. Durch die Verlagerung der Quetschung um die Höhe des vorgeformten Tellers nach unten ergibt sich zusätzlich eine Verlängerung des nutzbaren Entladungsweges, wodurch bei einem - im Vergleich zu den bekannten Kompaktlampen - gleich großen Außenkolben eine höhere Lampenleistung erzielt wird. Außerdem entsteht links und rechts der Quetschung ein zusätzlich nutzbarer Raum, in dem z. B. eine Vorschalt- und Zündvorrichtung untergebracht werden können.In addition to compact dimensions, the low-pressure discharge lamp according to the invention has a gu te lighting properties. The interior structure described above is simple both in terms of construction and production technology and results in a sufficient length of the discharge path. The use of the preformed plate with the melting edge upwards has the advantage over its reversed use according to the melting method already proposed that both the electrodes and the free part of the discharge are arranged transversely through the outer bulb below the base edge and thus invisibly. By shifting the pinch downwards by the height of the preformed plate, the usable discharge path is also extended, which means that a lamp bulb of the same size compared to the known compact lamps achieves a higher lamp output. In addition, an additional usable space is created to the left and right of the bruise, in which, for. B. a ballast and ignition device can be accommodated.

Die Erfindung ist anhand der folgenden Figuren näher erläutert. In schematischer Darstellung ist ein Ausführungsbeispiel wiedergegeben.

  • Figur 1 Vorderansicht des vorgeformten Tellers
  • Figur 2a Draufsicht des vorgeformten Tellers in einer ersten Ausführungsform
  • Figur 2b Draufsicht des vorgeformten Tellers in einer anderen Ausführungsform
  • Figur 3 Seitenansicht eines U-förmigen Innenro h res
  • Figur 4 Draufsicht des zusammengesetzten Grundaufbaues vor dem Quetschen
  • Figur 5 eingeschmolzene Lampe
  • Figur 6 fertige Lampe in perspektivischer Ansicht
The invention is explained in more detail with reference to the following figures. An exemplary embodiment is shown in a schematic representation.
  • Figure 1 front view of the preformed plate
  • Figure 2a top view of the preformed plate in a first embodiment
  • Figure 2b top view of the preformed plate in another embodiment
  • Figure 3 side view of a U-shaped inner tube h res
  • Figure 4 top view of the assembled basic structure before squeezing
  • Figure 5 melted lamp
  • Figure 6 finished lamp in perspective view

Der in Figur 1 und 2 dargestellte vorgeformte Teller 1 weist einen oberen, nach außen gerichteten Rand 3 auf, der in der Draufsicht kreisrund gestaltet ist und die künftige Verschmelzungslinie mit dem Außenkolben bildet. Der untere, bei der fertigen Lampe zum Sockel gerichtete Aufnahmeteil 2 hat die Querschnittsform einer länglichrunden Öffnung. Diese Öffnung ist zur Aufnahme der ersten Enden der U-förmigen Innenrohre vorgesehen. Die lichte Breite B ist an den Außendurchmesser der Innenrohre angepaßt und die Länge L entspricht etwa der Länge der späteren Quetschung. In der Figur 2b weisen die die halbrunden Endstücke der länglichrunden Öffnung verbindenden Teilstücke zur Lampenlängsachse Einschnürungen 16 auf, wodurch angenähert die Form einer Acht entsteht. Der Mittelteil4 zwischen dem Aufnahmeteil 2 und dem Rand 3 wird durch ein im wesentlichen hohlzylinderförmiges Stück gebildet, dessen Durchmesser kleiner als der des Randes 3 und gleich groß wie die Länge L des Aufnahmeteils 2 ist. Die Höhe des Tellers 1 beträgt ca. 25 mm und der Rand 3 weist einen Durchmesser von ca. 37 mm bis 40 mm auf. Der Durchmesser des hohlzylinderförmigen Mittelteils beträgt ca. 30 mm.The preformed plate 1 shown in FIGS. 1 and 2 has an upper, outwardly directed edge 3, which is circular in plan view and forms the future line of fusion with the outer bulb. The lower receiving part 2, which faces the base in the finished lamp, has the cross-sectional shape of an elongated, round opening. This opening is provided for receiving the first ends of the U-shaped inner tubes. The clear width B is adapted to the outer diameter of the inner tubes and the length L corresponds approximately to the length of the subsequent crushing. In FIG. 2b, the sections connecting the semicircular end pieces of the elongated round opening have constrictions 16 to the longitudinal axis of the lamp, which approximately results in the shape of an eight. The middle part 4 between the receiving part 2 and the edge 3 is formed by a substantially hollow cylindrical piece, the diameter of which is smaller than that of the edge 3 and the same length as the length L of the receiving part 2. The height of the plate 1 is approximately 25 mm and the edge 3 has a diameter of approximately 37 mm to 40 mm. The diameter of the hollow cylindrical middle part is approximately 30 mm.

In der Figur 3 ist ein U-förmiges Innenrohr 5 mit zwei geraden Schenkeln 6 und 7 dargestellt. Der erste Schenkel 6 ist gegenüber dem anderen Schenkel 7 ca. 10 mm verlängert ausgeführt. Das verlängerte Ende 8 des ersten Schenkels 6 ist zum Einführen in den Aufnahmeteil 2 des Tellers 1 vorgesehen und trägt keine Leuchtstoffbeschichtung. Der andere Schenkel 7 weist an seinem unteren Ende eine verbleibende Öffnung 9 auf. Das Innenrohr 5 weist einen Außendurchmesser von ca. 12 mm auf. Bei einer Wandstärke von ca. 1,0 mm ergibt sich dann ein Innendurchmesser von ca. 10,0 mm. Zwischen den Schenkeln 6 und 7 verbleibt ein Freiraum von ca. 3 mm.FIG. 3 shows a U-shaped inner tube 5 with two straight legs 6 and 7. The first leg 6 is approximately 10 mm longer than the other leg 7. The extended end 8 of the first leg 6 is provided for insertion into the receiving part 2 of the plate 1 and does not have a fluorescent coating. The other leg 7 has a remaining opening 9 at its lower end. The inner tube 5 has an outer diameter of approximately 12 mm. With a wall thickness of approx. 1.0 mm, the inner diameter is approx. 10.0 mm. There is a free space of approximately 3 mm between the legs 6 and 7.

Der in Figur 4 vormontierte Grundaufbau veranschaulicht die Anordnung zweier gleicher, mit Leuchtstoff beschichteter U-förmiger Innenrohre 5 und 5' im Aufnahmeteil 2 des Tellers 1 in der Draufsicht. Die vier Schenkel 6, 7 und 6', 7' verlaufen dabei parallel zueinander, wobei deren Längsachsen die Eckpunkte einer Raute oder eines Quadrats bilden. Die die Eckpunkte verbindenden Diagonalen D und D' schneiden sich in der Lampenlängsachse. Innerhalb der Schenkel 6 und 6' befinden sich die einen Perifuß aufweisenden vorheizbaren Elektroden (nicht dargestellt). Die Erwärmung und Quetschung des so gehalterten vormontierten Grundaufbaues erfolgt entlang der Länge L der länglichrunden Öffnung des Aufnahmeteils 2. Von der Unterseite des Tellers 1 wird dabei gleichzeitig ein in Lampenlängsachse angeordnetes Pumprohr (nicht dargestellt) in den Aufnahmeteil 2 eingequetscht.The basic assembly preassembled in FIG. 4 illustrates the arrangement of two identical, U-shaped inner tubes 5 and 5 'coated with phosphor in the receiving part 2 of the plate 1 in a plan view. The four legs 6, 7 and 6 ', 7' run parallel to one another, their longitudinal axes forming the corner points of a rhombus or a square. The diagonals D and D 'connecting the corner points intersect in the lamp longitudinal axis. The preheatable electrodes (not shown) which have a perifusion are located within the legs 6 and 6 '. The preassembled basic structure held in this way is heated and crushed along the length L of the elongated, round opening of the receiving part 2. At the same time, a pump tube (not shown) arranged in the longitudinal axis of the lamp is squeezed into the receiving part 2 from the underside of the plate 1.

Dem gequetschten, vormontierten Grundaufbau aus der Figur 4 ist anschließend ein röhrenförmiger Außenkolben 10 mit einem Außendurchmesser von ca. 38 mm bis ca. 50 mm übergestülpt. der mit dem oberen Rand 3 des Tellers 1 verschmolzen ist. Diese Fertigungsstufe ist in der Figur 5 dargestellt. Aus der fertig eingeschmolzenen Lampe ragen aus dem Unterteil des Tellers 1 das ebenfalls in die Quetschung einbezogene Pumprohr 11 sowie die zu den vorheizbaren Elektroden 12 und 12' durch die Quetschung geführten Stromzuführungspaare 13 und 13'. Die Stromzuführungen 13 und 13' können ein- oder mehrteilig ausgeführt sein. Als Material eignet sich besonders ein Kupfermanteldraht.A tubular outer bulb 10 with an outer diameter of approximately 38 mm to approximately 50 mm is then put over the crimped, pre-assembled basic structure from FIG. which is fused to the upper edge 3 of the plate 1. This production stage is shown in FIG. 5. The pump tube 11, which is also included in the pinch, and the power supply pairs 13 and 13 'which lead to the preheatable electrodes 12 and 12' through the pinch, protrude from the melted lamp from the lower part of the plate 1. The power supplies 13 and 13 'can be made in one or more parts. A copper sheathed wire is particularly suitable as the material.

Nachdem die Lampe gepumpt und gefüllt ist, wird das Pumprohr 11 dicht an dem Unterteil der Quetschung des Tellers 1 abgeschmolzen und mit einem Sockel 14 versehen, wie in der Figur 6 dargestellt. Für den direkten Anschluß an das Netz - z. B. bei einem Austausch gegen eine Glühlampe - kann in die Sockelhülse 15 eine elektronische Zünd- und Vorschalteinrichtung integriert sein.After the lamp has been pumped and filled, the pump tube 11 is melted close to the lower part of the pinch of the plate 1 and provided with a base 14, as shown in FIG. 6. For direct connection to the network - e.g. B. in exchange for an incandescent lamp - can be integrated in the base sleeve 15, an electronic ignition and ballast.

Eine Niederdruckentladungslampe gemäß der Erfindung weist eine Entladungslänge durch die beiden U-förmigen Innenrohre von ca. 460 mm auf. Als Füllung enthält die Kompaktlampe Quecksilber in einer Menge von ca. 10 mg sowie etwa 300 Pa Argon. Bei einer zugeführten Leistung von ca. 16 W weist die Lampe eine Brennspannung von ca. 95 V und einen Lampenstrom von ca. 200 mA auf. Die Höhe des Lichtstromes liegt bei etwa 1 000 Im.A low-pressure discharge lamp according to the invention has a discharge length of approximately 460 mm through the two U-shaped inner tubes. The compact lamp contains mercury in a quantity of approx. 10 mg and approx. 300 Pa argon. With a supplied power of approx. 16 W, the lamp has an operating voltage of approx. 95 V and a lamp current of approx. 200 mA. The luminous flux is around 1 000 Im.

Claims (8)

1. A low-pressure discharge lamp with a lamp base at one end, which has a bottom part (1), an external bulb (10) which is connected to the latter with a gas-tight seal, is filled with gas and/or metal vapour and is provided with a lamp base (14, 15), two preheatable electrodes (12, 12') which are provided with current supply leads (13, 13') and disposed inside the external bulb (10) on the bottom part, and one or two U-shaped internal tubes (5, 5') which are made of glass and are also disposed inside the external bulb (10), wherein the first end (8) of one of the straight parts (6) of each internal tube (5, 5') forms a gas-tight enclosure around the current supply leads of one of the preheatable electrodes (12, 12') and the second end of the other straight part (7) of each internal tube (5, 5') has an opening which is disposed in the vicinity of the bottom part (1), characterised in that both the electrodes (12,12') and the openings (9) are located below the upper rim of the lamp base and are thus invisible, and in that the bottom part is made of glass and consists of an outwardly-directed upper rim (3) disposed concentrically with the longitudinal axis of the lamp and forming a glass-to-metal seal with the external bulb (10), a lower holding part (2) which has an oval cross-section and faces towards the base (14, 15) of the lamp, and a hollow cylindrical middle part (4) which connects the inside edge of the rim with the holding part (2) and the diameter of which is less than the diameter of the rim (3) and equal to the length (L) of the holding part (2), the current supply leads (13, 13') of the preheatable electrodes (12, 12') and the first end (8) of each U-shaped internal tube (5, 5') being fused into the holding part (2).
2. A low-pressure discharge lamp as claimed in Claim 1, characterised in that each preheatable electrode (12, 12') is allocated a U-shaped internal tube (5, 5') and when viewed from above the longitudinal axes of the straight parts of the U-shaped internal tubes (5, 5') essentially form the corner points of a rhombus or a square the diagonals (D. D') of which form a point of intersection on the longitudinal axis of the lamp.
3. A low-pressure discharge lamp as claimed in Claim 1 and 2, characterised in that the gas-tight glass-to-metal seal of the first ends (8) of the U-shaped internal tubes (5, 5') with the power supply conductors (13, 13') of the preheatable electrodes (12, 12') and the lower holding part (2) of the bottom part (1) facing the lamp base is in the form of a pinching and the length of the pinching roughly corresponds to the length (L) of the holding part (2).
4. A low-pressure discharge lamp as claimed in Claim 1 to 3, characterised in that when viewed from above, the gas-tight glass-to-metal seal of the external bulb (10) with the upper outwardly-directed rim (3) of the bottom part (1) is in the form of a circle, the centre of which lies on the longitudinal axis of the lamp.
5. A low-pressure discharge lamp as claimed in Claim 1 to 4, characterised in that the internal surface of the U-shaped internal tubes (5, 5') and/or of the external bulb (10) is provided with a coating of fluorescent material.
6. A low-pressure discharge lamp as claimed in Claim 5, characterised in that the coating of fluorescent material consists of three different fluorescent components.
7. A low-pressure discharge lamp as claimed in Claim 1 to 6, characterised in that the internal surface of the external bulb (10) has a light- diffusing surface.
8. A method of manufacturing a low-pressure discharge lamp with a lamp base at one end as claimed in Claim 1 to 7, which has the following operating steps :
a) positioning the current supply leads (13, 13') provided with preheatable electrodes (12, 12') in relation to a bottom part made of glass having an upper outwardly-directed rim (3) disposed concentrically with the longitudinal axis of the lamp, a lower holding part (2) with an oval cross-section facing towards the base (14, 15) of the lamp, and a hollow cylindrical middle part (4) which connects the inside edge of the rim with the holding part and the diameter of which is less than the diameter of the rim (3) and equal to the length (L) of the holding part (2), their portion to be fused-in being located level with the holding part (2) of the bottom part ;
b) introducing the respective first ends (8) of the U-shaped internal tubes (5, 5') into the holding part (2) of the bottom part which exhibits an oval opening, these ends for their part each surrounding a preheatable electrode (12, 12') ;
c) heating in the region of the holding part (2) of the bottom part to a temperature suitable for deformation of the glass, during which the first ends (8) of the U-shaped internal tubes (5, 5') in this holding part are softened ;
d) pinching the positioned glass parts softened by the heating, the gas-tight glass-to-metal seal for both the U-shaped internal tubes (5, 5') being formed in one operation ;
e) placing the external bulb (10) over the basic structure so obtained with its lower part projecting over the upper outwardly-directed rim (3) of the bottom part by a predetermined amount ;
f) heating the continuously rotated arrangement in the area of the upper outwardly-directed rim (3) of the bottom part to a temperature suitable for deformation of the glass, during which the part of the external bulb (10) projecting over the rim (3) of the bottom part settles due to its own weight and forms a gas-tight glass-to-metal seal between the external bulb (10) and the heated rim (3) of the bottom part. or, instead of operation f),
g) heating the continuously rotated arrangement in the region of the upper outwardly-directed rim (3) of the bottom part to a temperature suitable for deformation of the glass, during which the heated part of the external bulb (10) is pressed against the similarly heated rim (3) of the bottom part by means of a roller and fused to form a gas-tight seal ;
h) fitting the lamp with a base (14, 15), the sleeve of which covers the electrodes (12, 12') and the free discharge path.
EP84102131A 1983-03-04 1984-02-29 Low-pressure discharge lamp with one-sided lamp base and its method of manufacture Expired EP0118834B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3307780 1983-03-04
DE19833307780 DE3307780A1 (en) 1983-03-04 1983-03-04 LOW PRESSURE DISCHARGE LAMP BASED ON ONE SIDE AND METHOD FOR PRODUCING THE SAME

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EP0118834A1 EP0118834A1 (en) 1984-09-19
EP0118834B1 true EP0118834B1 (en) 1988-01-20

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EP (1) EP0118834B1 (en)
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US5252890A (en) * 1989-09-12 1993-10-12 Toshiba Lighting And Technology Corporation Compact type fluorescent lamp device having crooked arc path
DE4442203A1 (en) * 1994-11-17 1996-05-23 Promatec Gmbh Berlin Discharge vessel for a compact lamp
DE19812447A1 (en) * 1998-03-23 1999-10-07 Walter Holzer Gas discharge tube design providing protection against accidental contact if glass fractures
US6183500B1 (en) * 1998-12-03 2001-02-06 Sli Lichtsysteme Gmbh Process and apparatus for the cosmetic treatment of acne vulgaris
DE10026909A1 (en) * 2000-05-31 2001-12-06 Philips Corp Intellectual Pty Low-pressure mercury discharge lamp with outer bulb
CN101896264A (en) * 2007-12-14 2010-11-24 特洛伊科技有限公司 Radiation source assembly and fluid handling system

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US2001501A (en) * 1933-03-10 1935-05-14 Gen Electric Gaseous electric discharge device
NL179854C (en) * 1977-08-23 1986-11-17 Philips Nv LOW-PRESSURE MERCURY DISCHARGE LAMP.
JPS54155675A (en) * 1978-05-30 1979-12-07 Matsushita Electronics Corp Small-sized fluorescent lamp
JPS56160753A (en) * 1980-05-14 1981-12-10 Matsushita Electronics Corp Fluorescent bulb and manufacturing method
DE3139732A1 (en) * 1981-10-06 1983-04-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München LOW PRESSURE DISCHARGE LAMP BASED ON ONE SIDE AND METHOD FOR PRODUCING THE SAME

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DE3307780A1 (en) 1984-09-06
DE3468956D1 (en) 1988-02-25
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EP0118834A1 (en) 1984-09-19
US4599536A (en) 1986-07-08

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