EP0118100B1 - Low-pressure discharge lamp with one-sided lamp base - Google Patents

Low-pressure discharge lamp with one-sided lamp base Download PDF

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Publication number
EP0118100B1
EP0118100B1 EP84102130A EP84102130A EP0118100B1 EP 0118100 B1 EP0118100 B1 EP 0118100B1 EP 84102130 A EP84102130 A EP 84102130A EP 84102130 A EP84102130 A EP 84102130A EP 0118100 B1 EP0118100 B1 EP 0118100B1
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EP
European Patent Office
Prior art keywords
lamp
low
pressure discharge
discharge lamp
glass
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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
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EP84102130A
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German (de)
French (fr)
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EP0118100A1 (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 EP0118100A1 publication Critical patent/EP0118100A1/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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H01J61/103—Shields, screens or guides arranged to extend the discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury

Definitions

  • the invention relates to a low-pressure discharge lamp with a base on one side, comprising an outer bulb which is sealed gas-tight with a melt and contains a gas and / or metal vapor filling, two preheatable electrodes which are provided with current leads and are arranged inside the outer bulb on the melt, and one or two U which are likewise arranged inside the outer bulb -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 arranged in the vicinity of the melting point.
  • Lamps with such a construction are referred to as compact lamps because of their greatly shortened design 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 with the first end a preheatable electrode is gas-tight enclosing and with the other end an opening to the lamp bulb having U-shaped inner tube.
  • 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-bonding 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 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 has a receiving part for the one or more U-shaped inner tubes and an outwardly directed edge for fusing with the outer bulb.
  • the preformed plate is required as an additional preliminary product for this manufacturing process, which appears to be particularly suitable for compact lamps of higher power levels. The manufacture of this plate is only possible with special manufacturing devices, which leads to an undesirable increase in the price of the lamp.
  • the object of the invention is to provide a single-ended, low-pressure discharge lamp of the type mentioned at the beginning for, in particular, low power levels, which, as a compact lamp with low power consumption in terms of shape, size and light output, is comparable to an incandescent lamp and can therefore be used in existing lamps.
  • the lamp construction should have as few pre-products as possible and enable production on machines with high output in order to be able to offer the end product at low cost.
  • a low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that both the melting of the current leads holding the preheatable electrodes in the one or more U-shaped inner tubes and the melting of the one or more U-shaped inner tubes in the outer bulb from a pinch and that the U-shaped inner tube (s) is or are positioned during the squeezing process by means of a holder remaining in the lamp and having at least one holding element.
  • the holding elements can consist of metallic material (eg spring steel) or of a temperature-resistant, advantageously translucent plastic.
  • the pump tube which is also squeezed into the melt, forms part of the holder to which the holding elements are attached.
  • a metallic holder for example a rigid wire
  • the holding elements advantageously have the U-shaped inner tubes, at least partially narrowly encompassing form of clips.
  • a construction is also possible in which the U-shaped inner tubes are positioned against one another and in the direction of the outer bulb by means of spacers. The U-shaped inner tubes held in this way and the outer bulb placed over them are then connected gas-tight to one another by a pinch, the ends of the inner tubes assigned to the electrodes being closed, the inner tubes being connected to the outer bulb and the outer bulb being closed in one operation.
  • the operating voltage of the lamp and thus its power consumption is increased by extending 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 discharge vessel consisting of outer bulbs and in particular the U-shaped inner tubes, preferably contains mercury and an inert gas as the 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 due to the thermal conditions occurring during operation is returned in a constant dynamic process, so that the entire volume of the inner tube or tubes is evenly filled 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 contains individual components emitting red, green and blue.
  • 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 internal matting or a siliconized coating possible.
  • the outer bulb is provided with a base at the electrode end, 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 a ballast located inside the 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 example, designed as an adapter to the lamp or is part of the lamp.
  • a compact low-pressure discharge lamp of the type described here is particularly suitable for small lamps with low electrical power consumption. Since no additional preliminary products, such as, for. B. melting plates or preformed plates are required, and the connection itself is made in only one operation, the manufacturing costs are reduced.
  • a holder remaining in the lamp, preferably having two holding elements per inner tube, is used for the exact positioning during the squeezing process of the preferably two U-shaped inner tubes, which at the same time also ensures good vibration resistance of the finished lamp.
  • the preheatable electrodes are advantageously held by a pearl base that has one-piece power supplies. Instead of the one-part power supply, multi-part power supplies can also be used.
  • the further processing to the finished lamp is largely carried out according to known work steps.
  • the low-pressure discharge lamp according to the invention has good 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, in particular for lamps of low power.
  • FIG. 1 shows a U-shaped inner tube 1 made of glass with two straight legs 2 and 3.
  • the first leg 2 is extended by approximately 10 mm compared to the other leg 3.
  • a pearl base frame with the electrode coils (12 and 12 'in FIGS. 3 and 4) is inserted into the extended end 4 of the first leg 2.
  • This extended end 4 has no fluorescent coating.
  • the other leg 3 has a remaining opening 5 at its lower end.
  • the inner tube 1 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 2 and 3.
  • the lamp assembled in FIG. 2 illustrates the arrangement of two identical, U-shaped inner tubes 1 and 1 'coated with phosphor in the outer bulb 6 in a plan view.
  • the outer bulb 6 has an outer diameter of approximately 40 mm.
  • the four legs 2, 3 and 2 ', 3' 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.
  • Within the legs 2 and 2 ' are those with a pearl base preheatable electrodes (not shown).
  • Each of the U-shaped inner tubes 1 and 1 ' is positioned by two holding clips 7 and 7' (or 8 and 8 'in FIGS.
  • the holding clips 7 and 7 '(or 8 and 8') in the exemplary embodiment consist of spring steel 4 x 0.2 mm.
  • FIG 3 shows a completely squeezed lamp.
  • the squeeze 10 includes the one-piece power supply pairs 11 and 11 ', the extended parts 4 of each U-shaped inner tube 1 and 1', and the pump tube 9 and the holder 9 'running on the lamp axis. Between the current supply pairs 11 and 11 ', for which copper sheathed wire is a particularly suitable material, an electrode coil 12 and 12' is stretched in each case.
  • the pump tube 9 is melted close to the pinch 10 and the lamp is provided with a base 14, as shown in FIG.
  • a base 14 for direct connection to the network - e.g. when exchanged for an incandescent lamp - an electronic ignition and ballast device can be integrated in the base sleeve 13.
  • a low-pressure discharge lamp according to the invention has a discharge length of approximately 270 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. 12 W, the lamp has an operating voltage of approx. 65 V and a lamp current of approx. 220 mA. The luminous flux is around 650 Im.

Description

Die Erfindung betrifft eine einseitig gesockelte Niederdruckentladungslampe, aufweisend einen mit einer Einschmelzung gasdicht abgeschlossenen und eine Gas- und/oder Metalldampffüllung enthaltenden Aussenkolben, zwei mit Stromzuführungen versehene, innerhalb des Aussenkolbens an der Einschmelzung angeordnete vorheizbare Elektroden sowie ein oder zwei ebenfalls innerhalb des Aussenkolbens angeordnete U-förmige Innenrohre aus Glas, 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 der Einschmelzung angeordnet ist.The invention relates to a low-pressure discharge lamp with a base on one side, comprising an outer bulb which is sealed gas-tight with a melt and contains a gas and / or metal vapor filling, two preheatable electrodes which are provided with current leads and are arranged inside the outer bulb on the melt, and one or two U which are likewise arranged inside the outer bulb -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 arranged in the vicinity of the melting point.

Lampen mit einem derartigen Konstruktionsaufbau werden aufgrund ihrer gegenüber herkömmlichen Niederdruckentladungslampen stark verkürzten Bauform 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 design 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 endeavor in the development of compact lamps is to achieve high light output and good color rendering with the size, shape and pricing that are 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 dem die Gasfüllung umschliessenden Aussenkolben andererseits erfolgt dabei mittels eines Schmeizverbindungsglases 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 with the first end a preheatable electrode is gas-tight enclosing and with the other end an opening to the lamp bulb having U-shaped inner tube. 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-bonding 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 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 vorgeformte Teller weist einen Aufnahmeteil für das oder die U-förmigen Innenrohre sowie einen nach aussen gerichteten Rand zur Verschmelzung mit den Aussenkolben auf. Für dieses Fertigungsverfahren, das insbesondere für Kompaktlampen höherer Leistungsstufen geeignet erscheint, ist jedoch der vorgeformte Teller als zusätzliches Vorerzeugnis erforderlich. Die Herstellung dieses Tellers ist nur mit speziellen Fertigungsvorrichtungen möglich, wodurch eine ungewünschte Verteuerung der Lampe eintritt.Furthermore, EP-A-0 076 503 proposed a low-pressure discharge lamp with a base on one side, in which a preformed plate 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 has a receiving part for the one or more U-shaped inner tubes and an outwardly directed edge for fusing with the outer bulb. However, the preformed plate is required as an additional preliminary product for this manufacturing process, which appears to be particularly suitable for compact lamps of higher power levels. The manufacture of this plate is only possible with special manufacturing devices, which leads to an undesirable increase in the price of the lamp.

Aufgabe der Erfindung ist es, eine einseitig gesockelte Niederdruckentladungslampe der eingangs erwähnten Art für insbesondere kleine Leistungsstufen 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 möglichst wenig Vorerzeugnisse aufweisen und eine Fertigung auf Maschinen mit hoher Leistung ermöglichen, um das Endprodukt preisgünstig anbieten zu können.The object of the invention is to provide a single-ended, low-pressure discharge lamp of the type mentioned at the beginning for, in particular, low power levels, which, as a compact lamp with low power consumption in terms of shape, size and light output, is comparable to an incandescent lamp and can therefore be used in existing lamps. The lamp construction should have as few pre-products as possible and enable production on machines with high output in order to be able to offer the end product at low cost.

Eine Niederdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen ist erfindungsgemäss dadurch gekennzeichnet, dass sowohl die Einschmelzung der die vorheizbaren Elektroden halternden Stromzuführungen in dem oder den U-förmigen Innenrohren wie auch die Einschmelzung des oder der U-förmigen Innenrohre in dem Aussenkolben aus einer Quetschung besteht, und dass das oder die U-förmigen Innenrohre während des Quetschvorganges mittels eines in der Lampe verbleibenden, mindestens ein Halteelement aufweisenden Halters positioniert ist bzw. sind. Die Halteelemente können aus metallischem Werkstoff (z.B. Federstahl) oder aus einem temperaturbeständigen, vorteilhafterweise lichtdurchlässigen Kunststoff bestehen. Das ebenfalls in die Einschmelzung eingequetschte Pumprohr bildet in weiterer Ausgestaltung der Erfindung einen Teil des Halters, an dem die Halteelemente befestigt sind. Anstelle eines verlängerten Pumprohres kann aber auch ein metallischer Halter, z.B. ein starrer Draht, in die Quetschung eingeschmolzen werden, an dem dann die die U-förmigen Innenrohre positionierenden Halteelemente mit einer Punktschweissung befestigt sind. Die Halteelemente weisen vorteilhafterweise die die U-förmigen Innenrohre mindestens teilweise eng umfangende Form von Klammern auf. Des weiteren ist aber auch eine Konstruktion möglich, bei der die U-förmigen Innenrohre durch Distanzstücke gegeneinander und in Richtung zum Aussenkolben positioniert sind. Die derart gehalterten U-förmigen Innenrohre sowie der über diese gestülpte Aussenkolben werden anschliessend durch eine Quetschung gasdicht miteinander verbunden, wobei das Verschliessen der den Elektroden zugeordneten Enden der Innenrohre, das Verbinden der Innenrohre mit dem Aussenkolben und das Verschliessen des Aussenkolbens in einem Arbeitsgang erfolgt.A low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that both the melting of the current leads holding the preheatable electrodes in the one or more U-shaped inner tubes and the melting of the one or more U-shaped inner tubes in the outer bulb from a pinch and that the U-shaped inner tube (s) is or are positioned during the squeezing process by means of a holder remaining in the lamp and having at least one holding element. The holding elements can consist of metallic material (eg spring steel) or of a temperature-resistant, advantageously translucent plastic. In a further embodiment of the invention, the pump tube, which is also squeezed into the melt, forms part of the holder to which the holding elements are attached. Instead of an extended pump tube, a metallic holder, for example a rigid wire, can also be melted into the pinch, to which the holding elements, which position the U-shaped inner tubes, are then fixed with a spot weld. The holding elements advantageously have the U-shaped inner tubes, at least partially narrowly encompassing form of clips. Furthermore, a construction is also possible in which the U-shaped inner tubes are positioned against one another and in the direction of the outer bulb by means of spacers. The U-shaped inner tubes held in this way and the outer bulb placed over them are then connected gas-tight to one another by a pinch, the ends of the inner tubes assigned to the electrodes being closed, the inner tubes being connected to the outer bulb and the outer bulb being closed in one operation.

Die Brennspannung der Lampe und damit deren Leistungsaufnahme wird durch eine Verlängerung der Entladungsbahn 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.The operating voltage of the lamp and thus its power consumption is increased by extending 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.

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 sog. 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 the 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 due to the thermal conditions occurring during operation is returned in a constant dynamic process, so that the entire volume of the inner tube or tubes is evenly filled 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 contains individual components emitting red, green and blue.

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 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. Vorteilhafterweise 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 Vorschaltgerät 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 with a base at the electrode end, 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 a ballast located inside 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 example, designed as an adapter to the lamp or is part of the lamp.

Eine Kompakt-Niederdruckentladungslampe der hier beschriebenen Art ist insbesondere für kleine Lampen mit niedriger elektrischer Leistungsaufnahme geeignet. Da für die gasdichte Quetschverbindung keine zusätzlichen Vorerzeugnisse, wie z. B. Einschmelzplatten oder vorgeformte Teller erforderlich sind, und die Verbindung selbst in nur einem Arbeitsgang hergestellt wird, verringern sich die Herstellkosten. Für die genaue Positionierung während des Quetschvorganges der vorzugsweise zwei einzuquetschenden U-förmigen Innenrohre ist ein in der Lampe verbleibender, vorzugsweise zwei Halteelemente je Innenrohr aufweisender Halter verwendet, der gleichzeitig auch für eine gute Erschütterungsfestigkeit der fertigen Lampe sorgt. Die vorheizbaren Elektroden werden vorteilhafterweise von einem einteilige Stromzuführungen aufweisenden Perlfuss gehaltert. Anstelle der einteiligen können auch mehrteilige Stromzuführungen verwendet werden. Die Weiterverarbeitung zur fertigen Lampe erfolgt weitgehend nach bekannten Arbeitsschritten. Die erfindungsgemässe Niederdruckentladungslampe weist neben kompakten Abmessungen gute lichttechnische Eigenschaften auf. Der zuvor beschriebene Innenaufbau ist sowohl konstruktiv wie auch fertigungstechnisch einfach und ergibt insbesondere für Lampen niedriger Leistung eine ausreichende Länge des Entladungsweges.A compact low-pressure discharge lamp of the type described here is particularly suitable for small lamps with low electrical power consumption. Since no additional preliminary products, such as, for. B. melting plates or preformed plates are required, and the connection itself is made in only one operation, the manufacturing costs are reduced. A holder remaining in the lamp, preferably having two holding elements per inner tube, is used for the exact positioning during the squeezing process of the preferably two U-shaped inner tubes, which at the same time also ensures good vibration resistance of the finished lamp. The preheatable electrodes are advantageously held by a pearl base that has one-piece power supplies. Instead of the one-part power supply, multi-part power supplies can also be used. The further processing to the finished lamp is largely carried out according to known work steps. In addition to compact dimensions, the low-pressure discharge lamp according to the invention has good 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, in particular for lamps of low power.

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

  • Figur 1 Seitenansicht eines U-förmigen Innenrohres
  • Figur 2 Draufsicht einer montierten Lampe
  • Figur 3 eingeschmolzene Lampe mit einer Quetschung
  • Figur 4 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 side view of a U-shaped inner tube
  • Figure 2 top view of an assembled lamp
  • Figure 3 melted lamp with a pinch
  • Figure 4 finished lamp in perspective view

In der Figur 1 ist ein U-förmiges Innenrohr 1 aus Glas mit zwei geraden Schenkeln 2 und 3 dargestellt. Der erste Schenkel 2 ist gegenüber dem anderen Schenkel 3 um ca. 10 mm verlängert ausgeführt. In das verlängerte Ende 4 des ersten Schenkels 2 wird ein Perlfussgestell mit den Elektrodenwendeln (12 und 12' in Fig. 3 und 4) eingeführt. Dieses verlängerte Ende 4 trägt keine Leuchtstoffbeschichtung. Der andere Schenkel 3 weist an seinem unteren Ende eine verbleibende Öffnung 5 auf. Das Innenrohr 1 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 2 und 3 verbleibt ein Freiraum von ca. 3 mm.FIG. 1 shows a U-shaped inner tube 1 made of glass with two straight legs 2 and 3. The first leg 2 is extended by approximately 10 mm compared to the other leg 3. A pearl base frame with the electrode coils (12 and 12 'in FIGS. 3 and 4) is inserted into the extended end 4 of the first leg 2. This extended end 4 has no fluorescent coating. The other leg 3 has a remaining opening 5 at its lower end. The inner tube 1 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 2 and 3.

Die in Figur 2 montierte Lampe veranschaulicht die Anordnung zweier gleicher, mit Leuchtstoff beschichteter U-förmiger Innenrohre 1 und 1' im Aussenkolben 6 in der Draufsicht. Der Aussenkolben 6 weist einen Aussendurchmesser von ca. 40 mm auf. Die vier Schenkel 2, 3 und 2', 3' 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 2 und 2' befinden sich die einen Perlfuss aufweisenden vorheizbaren Elektroden (nicht dargestellt). Jedes der U-förmigen Innenrohre 1 und 1' ist von zwei die parallelverlaufenden Schenkel eng umschliessenden Halteklammern 7 und 7' (bzw. 8 und 8' in Fig. 3 und 4) während des Quetschvorganges positioniert, wobei sämtliche Halteklammern 7 und 7' (bzw. 8 und 8') an einem auf der Lampenlängsachse verlaufenden und mit dem Pumprohr 9 aus einem Teil bestehenden Halter 9' befestigt sind. Die Halteklammern 7 und 7' (bzw. 8 und 8') bestehen im Ausführungsbeispiel aus Federbandstahl 4 x 0,2 mm.The lamp assembled in FIG. 2 illustrates the arrangement of two identical, U-shaped inner tubes 1 and 1 'coated with phosphor in the outer bulb 6 in a plan view. The outer bulb 6 has an outer diameter of approximately 40 mm. The four legs 2, 3 and 2 ', 3' 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. Within the legs 2 and 2 'are those with a pearl base preheatable electrodes (not shown). Each of the U-shaped inner tubes 1 and 1 'is positioned by two holding clips 7 and 7' (or 8 and 8 'in FIGS. 3 and 4) closely enclosing the parallel legs, all holding clips 7 and 7' ( or 8 and 8 ') are fastened to a holder 9' which runs on the longitudinal axis of the lamp and consists of one part with the pump tube 9. The holding clips 7 and 7 '(or 8 and 8') in the exemplary embodiment consist of spring steel 4 x 0.2 mm.

Figur 3 zeigt eine fertig gequetschte Lampe. In die Quetschung 10 sind die einteiligen Stromzuführungspaare 11 und 11', die verlängerten Teile 4 jedes U-förmigen Innenrohres 1 und l' sowie das auf der Lampenlängsachse verlaufende Pumprohr 9 und der Halter 9' einbezogen. Zwischen den Stromzuführungspaaren 11 und 11', für die Kupfermanteldraht ein besonders geeigneter Werkstoff ist, ist jeweils eine Elektrodenwendel 12 und 12' gespannt.Figure 3 shows a completely squeezed lamp. The squeeze 10 includes the one-piece power supply pairs 11 and 11 ', the extended parts 4 of each U-shaped inner tube 1 and 1', and the pump tube 9 and the holder 9 'running on the lamp axis. Between the current supply pairs 11 and 11 ', for which copper sheathed wire is a particularly suitable material, an electrode coil 12 and 12' is stretched in each case.

Nachdem die Lampe gepumpt und gefüllt ist, wird das Pumprohr 9 dicht an der Quetschung 10 abgeschmolzen und die Lampe mit einem Sockel 14 versehen, wie in der Figur 4 dargestellt. Für den direkten Anschluss an das Netz - z.B. bei einem Austausch gegen eine Glühlampe - kann in die Sockelhülse 13 eine elektronische Zünd- und Vorschalteinrichtung integriert sein.After the lamp has been pumped and filled, the pump tube 9 is melted close to the pinch 10 and the lamp is provided with a base 14, as shown in FIG. For direct connection to the network - e.g. when exchanged for an incandescent lamp - an electronic ignition and ballast device can be integrated in the base sleeve 13.

Eine Niederdruckentladungslampe gemäss der Erfindung weist eine Entladungslänge durch die beiden U-förmigen Innenrohre von ca. 270 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. 12 W weist die Lampe eine Brennspannung von ca. 65 V und einen Lampenstrom von ca. 220 mA auf. Die Höhe des Lichtstromes liegt bei etwa 650 Im.A low-pressure discharge lamp according to the invention has a discharge length of approximately 270 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. 12 W, the lamp has an operating voltage of approx. 65 V and a lamp current of approx. 220 mA. The luminous flux is around 650 Im.

Claims (8)

1. A low-pressure discharge lamp with a lamp base at one end displaying an external bulb (6) sealed in a gas-tight manner with a glass-to-metal seal (10) and filled with gas and/or metal vapour, two preheatable electrodes (12,12') provided with current supply leads (11, 11') and disposed inside the external bulb (6) at the glass-to-metal seal (10) and one or two U-shaped internal tubes (1, 1') also disposed inside the external bulb (6) and made of glass, wherein the first end (4) of one of the straight parts (2) of each internal tube (1,1') forms a gas-tight enclosure around the current supply leads (11, 11') of one of the preheatable electrodes (12, 12') and the second end of the other straight part (3) of each internal tube (1,1') has an opening (5) which is located in the vicinity of the glass-to-metal seal (10), characterised in that both the glass-to-metal seal of the current supply leads (11, 11') holding the preheatable electrodes (12,12') in the U-shaped internal tube or tubes (1, 1') and the glass-to-metal seal of the U-shaped internal tube or tubes (1, 1') in the external bulb (6) consist of a pinching (10), and in that during the pinching operation, the U-shaped internal tube or tubes (1, 1') is or are positioned by means of a support (9') which remains in the lamp and has at least one supporting element (7, 7'; 8, 8').
2. A low-pressure discharge lamp as claimed in Claim 1, characterised in that a pumping tube (9) is also pinched in the glass-to-metal seal (10).
3. A low-pressure discharge lamp as claimed in Claim 1 and 2, characterised in that the pumping tube (9) and the support (9') positioning the U-shaped internal tubes (1, 1') form a single part.
4. A low-pressure discharge lamp as claimed in Claims 1 to 3, characterised in that each preheatable electrode (12, 12') is allocated a U-shaped internal tube (1, 1') and, when viewed from above, the longitudinal axes of the straight parts of the U-shaped internal tubes (1,1') 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.
5. A low-pressure discharge lamp as claimed in Claims 1 to 4, characterised in that the internal surface of the U-shaped internal tubes (1, 1') and/ or of the external bulb (6) 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 Claims 1 to 6, characterised in that the internal surface of the external bulb (6) has a light-diffusing surface.
8. A method of producing a low-pressure discharge lamp with a lamp base at one end as claimed in Claim 1, characterised in thatthe pinching (10) is produced in one operation.
EP84102130A 1983-03-04 1984-02-29 Low-pressure discharge lamp with one-sided lamp base Expired EP0118100B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3307763 1983-03-04
DE19833307763 DE3307763A1 (en) 1983-03-04 1983-03-04 LOW-PRESSURE DISCHARGE LAMP BASED ON ONE SIDE

Publications (2)

Publication Number Publication Date
EP0118100A1 EP0118100A1 (en) 1984-09-12
EP0118100B1 true EP0118100B1 (en) 1988-01-27

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DE (2) DE3307763A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8600252A (en) * 1986-02-03 1987-09-01 Philips Nv LOW-PRESSURE MERCURY DISCHARGE LAMP.
DE4027783A1 (en) * 1990-09-03 1992-04-30 Holzer Walter GAS DISCHARGE DEVICE FOR COMPACT LAMPS
HU214797B (en) * 1994-11-23 1998-05-28 Ge Lighting Tungsram Rt. Single ended discharge lamp
DE19546198A1 (en) * 1995-12-11 1997-06-12 Holzer Walter Prof Dr H C Ing Compact lamp
JP3115826B2 (en) * 1996-07-01 2000-12-11 松下電子工業株式会社 Light bulb type fluorescent lamp
DE19737920A1 (en) * 1997-08-27 1999-03-04 Walter Dipl Chem Dr Rer N Tews Long life low pressure gas discharge lamp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0076503A2 (en) * 1981-10-06 1983-04-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH One-base low-pressure discharge lamp, and method of manufacturing it

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3271115D1 (en) * 1981-03-31 1986-06-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method for manufacturing a pinched seal for an electric lamp envelope and pinching device for carrying out the method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0076503A2 (en) * 1981-10-06 1983-04-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH One-base low-pressure discharge lamp, and method of manufacturing it

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DE3307763A1 (en) 1984-09-06
DE3469105D1 (en) 1988-03-03
EP0118100A1 (en) 1984-09-12

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