EP0076503B1 - One-base low-pressure discharge lamp, and method of manufacturing it - Google Patents

One-base low-pressure discharge lamp, and method of manufacturing it Download PDF

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Publication number
EP0076503B1
EP0076503B1 EP82109150A EP82109150A EP0076503B1 EP 0076503 B1 EP0076503 B1 EP 0076503B1 EP 82109150 A EP82109150 A EP 82109150A EP 82109150 A EP82109150 A EP 82109150A EP 0076503 B1 EP0076503 B1 EP 0076503B1
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EP
European Patent Office
Prior art keywords
flare
preshaped
lamp
outer envelope
discharge lamp
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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
Application number
EP82109150A
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German (de)
French (fr)
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EP0076503A3 (en
EP0076503A2 (en
Inventor
Gerhard Dr. Steeger
Josef Plischke
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Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP0076503A2 publication Critical patent/EP0076503A2/en
Publication of EP0076503A3 publication Critical patent/EP0076503A3/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
    • H01J61/34—Double-wall vessels or containers
    • 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
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • 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
    • H01J9/40—Closing vessels

Definitions

  • the invention relates to a low-pressure discharge lamp with a base on one side, which consists of a foot part, a pump tube melted onto the foot part, an outer bulb connected gas-tight to the foot part and containing a gas and / or metal vapor filling, two preheatable electrodes arranged inside the outer bulb on the foot part, and at least one likewise inside of the outer bulb arranged U-shaped inner tube consists of glass, the end of one of the straight legs of each inner tube enclosing a preheatable electrode gas-tight and the end of each other straight leg to the outer bulb has an opening which is arranged near the foot part.
  • 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 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.
  • 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 a low power consumption, is comparable in form 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.
  • a low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that the foot part is a preformed plate made of glass, which has an upper, elongated round receiving part directed towards the lamp inside, in which the two preheatable electrodes and the end of each one straight Legs of each U-shaped inner tube are melted, which is provided with a lower, outwardly directed, concentrically arranged to the lamp longitudinal axis edge, which is fused to the outer bulb, and that the receiving part and the edge are connected by a hollow cylindrical central part, the diameter of which is smaller is as the diameter of the rim and as the length of 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 preheatable electrodes and the upper receiving part of the preformed plate directed towards the lamp interior is in the form of a pinch, the length of the pinch corresponding approximately to the length of the receiving part.
  • This part of the upper plate which receives the first ends of the U-shaped inner tubes has an elongated circular opening, the width of which is somewhat larger than the outer diameter of the inner tubes, before the squeezing process.
  • the sections connecting the semicircular end pieces of the elongated round opening can be drawn in to the lamp longitudinal axis, so that the shape of a figure eight approximates when viewed from above.
  • the lower, outward-facing plate rim is circular and concentric with the longitudinal axis of the lamp Diameter is adapted to the inner 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 central part is both smaller than 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 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 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 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. 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. 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. 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 plays a major part in this.
  • a glass tube the diameter of which corresponds to the central part of the finished preformed plate, is placed on one end, which creates the outward edge of the plate.
  • This plate blank is placed in a rotating receptacle, which also causes it to rotate, and the upper, cylindrical area is gradually brought to a temperature suitable for the deformation of the glass.
  • An inner mold is then inserted into the heated plate blank from above and two outer mold halves are closed from the outside around the upper part, as a result of which the heated upper plate part is given the desired shape of the receiving part with the elongated, round opening.
  • the holder for the plate does not turn during the forming process.
  • the shaping tools for the elongated round opening of the receiving part can be designed differently. So z. B. the elongated round opening straight or indented side surfaces, similar to an eight. After the deformed glass has regained sufficient strength, the inner mold is extended again, a scraper preventing the preformed plate from getting caught on the inner mold, and the outer mold halves are opened again. After the final tempering process, the preformed divider is ready for further processing as an integral part of the lamp.
  • a frame provided with the preheatable electrodes advantageously has one-piece power supplies, which, for. B. can be held by means of a perifoot.
  • racks held in a receptacle are also conceivable during the squeezing process.
  • multi-part power supplies can also be used.
  • the preformed plate is placed 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 upper, 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 lower edge of the plate, which is arranged concentrically to the lamp axis, on a melting machine with neck waste, or the piston neck brought to the deformation temperature is pressed against the heated edge of the plate by means of a roller. After pumping, filling and socketing, the lamp is ready for operation.
  • the low-pressure discharge lamp according to the invention has good lighting properties.
  • the interior structure described above is both constructive as well as technically simple and results in a sufficient length of the discharge path.
  • the preformed plate 1 shown in FIGS. 1 and 2 has an upper receiving part 2 directed towards the inside of the lamp, which has the shape of an elongated, round opening in plan view. 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 Figure 2b they have the semicircular end. Pieces of the elongated round opening connecting pieces to the lamp longitudinal axis constrictions 16, which approximately creates the shape of an eight.
  • the lower, outwardly directed edge 3 of the plate 1 is circular and forms the future line of fusion with the outer bulb.
  • 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 both smaller than that of the edge 3 and smaller than the length L of the receiving part.
  • 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.
  • the squeezed, preassembled basic structure from FIG. 4 is then fitted with a tubular outer bulb 10 with an outer diameter of approximately 38 mm to approximately 50 mm, which is fused to the lower 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 fusion between the outer bulb 10 and the edge 3 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 power input of approx. 15 W, the lamp has an operating voltage of approx. 100 V and a lamp current of approx. 170 mA. The luminous flux is around 1 000 Im.

Description

Die Erfindung betrifft eine einseitig gesockelte Niederdruckentladungslampe, die aus einem Fußteil, einem am Fußteil angeschmolzenen Pumprohr, einem mit dem Fußteil gasdicht verbundenen und eine Gas- und/oder Metalldampffüllung enthaltenden Außenkolben, zwei innerhalb des Außenkolbens am Fußteil ageordneten vorheizbaren Elektroden sowie mindestens einem ebenfalls innerhalb des Außenkolbens angeordneten U-förmigen Innenrohr aus Glas besteht, wobei das Ende des einen der geraden Schenkel jedes Innenrohres eine vorheizbare Elektrode gasdicht umschließt und das Ende jedes anderen geraden Schenkels zum Außenkolben hin 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 consists of a foot part, a pump tube melted onto the foot part, an outer bulb connected gas-tight to the foot part and containing a gas and / or metal vapor filling, two preheatable electrodes arranged inside the outer bulb on the foot part, and at least one likewise inside of the outer bulb arranged U-shaped inner tube consists of glass, the end of one of the straight legs of each inner tube enclosing a preheatable electrode gas-tight and the end of each other straight leg to the outer bulb has an opening which is arranged near the foot part.

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 Herstellkosten 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 consumer is above the threshold of willingness to buy, and 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 dem 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 Herstelltechnik. 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.

Aufgabe der Erfindung ist es, eine einseitig gesockelte Niederdruckentladungslampe der eingangs erwähnten Art zu schaffen, die als Kompaktlampe kleiner Leistungsaufnahme in bezug auf Form 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.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 a low power consumption, is comparable in form 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.

Eine Niederdruckentladungslampe mit den im Oberbegriff des Hauptanspruchs genannten Merkmalen ist erfindungsgemäß dadurch gekennzeichnet, daß das Fußteil ein vorgeformter Teller aus Glas ist, der einen oberen, zum Lampeninnern gerichteten, länglichrunden Aufnahmeteil aufweist, in den die zwei vorheizbaren Elektroden sowie das Ende des jeweils einen geraden Schenkels jedes U-förmigen Innenrohres eingeschmolzen sind, der mit einem unteren, nach außen gerichteten, zur Lampenlängsachse konzentrisch angeordneten Rand versehen ist, der mit dem Außenkolben verschmolzen ist, und daß das Aufnahmeteil und der Rand durch einen hohlzylindrischen Mittelteil verbunden sind, dessen Durchmesser kleiner ist als der Durchmesser des Randes und als die Länge des Aufnahmeteils. 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.A low-pressure discharge lamp with the features mentioned in the preamble of the main claim is characterized in that the foot part is a preformed plate made of glass, which has an upper, elongated round receiving part directed towards the lamp inside, in which the two preheatable electrodes and the end of each one straight Legs of each U-shaped inner tube are melted, which is provided with a lower, outwardly directed, concentrically arranged to the lamp longitudinal axis edge, which is fused to the outer bulb, and that the receiving part and the edge are connected by a hollow cylindrical central part, the diameter of which is smaller is as the diameter of the rim and as the length of 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.

Die gasdichte Einschmelzung der ersten Enden der U-förmigen Innenrohre mit den 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 Teil des oberen Tellers weist vor dem Quetschvorgang eine länglichrunde Öffnung auf, deren 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 Draufsicht angenähert die Form einer Acht entsteht.According to the invention, the gas-tight melting of the first ends of the U-shaped inner tubes with the preheatable electrodes and the upper receiving part of the preformed plate directed towards the lamp interior is in the form of a pinch, the length of the pinch corresponding approximately to the length of the receiving part. This part of the upper plate which receives the first ends of the U-shaped inner tubes has an elongated circular opening, the width of which is somewhat larger than the outer diameter of the inner tubes, before the squeezing process. 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 lamp longitudinal axis, so that the shape of a figure eight approximates when viewed from above.

Der untere, 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 sowohl kleiner als die Länge des Aufnahmeteils wie auch kleiner als der Durchmesser des Randes des vorgeformten Tellers.The lower, outward-facing plate rim is circular and concentric with the longitudinal axis of the lamp Diameter is adapted to the inner 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 central part is both smaller than 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 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 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 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. 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 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 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 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. 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. Zu dessen Herstellung wird ein Glasrohr, dessen Durchmesser dem Mittelteil des fertigen vorgeformten Tellers entspricht, an einem Ende aufgetellert, wodurch der nach außen gerichtete Rand des Tellers entsteht. Dieser Tellerrohling wird in eine sich drehende Aufnahme gelegt, wodurch er ebenfalls in Drehung versetzt wird, und im oberen, zylindrischen Bereich stufenweise auf eine für die Verformung des Glases geeignete Temperatur gebracht wird. Im Anschluß daran wird von oben in den erwärmten Tellerrohling eine Innenform eingefahren und von außen werden zwei Außenformhälften um den oberen Teil geschlossen, wodurch der erwärmte obere Tellerteil die gewünschte Form des Aufnahmeteils mit der länglichrunden Öffnung erhält. Während des Umformvorganges dreht sich die Aufnahme für den Teller nicht. Die Formwerkzeuge für die länglichrunde Öffnung des Aufnahmeteils können unterschiedlich ausgestaltet sein. So kann z. B. die länglichrunde Öffnung gerade oder eingezogene Seitenflächen, ähnlich einer Acht, aufweisen. Nachdem das umgeformte Glas wieder ausreichend Festigkeit gewonnen hat, wird die Innenform wieder ausgefahren, wobei ein Abstreifer das Hängenbleiben des vorgeformten Tellers an der Innenform verhindert, und die Außenformhälften werden wieder geöffnet. Nach dem abschließenden Tempervorgang ist der vorgeformte Teiler für die Weiterverarbeitung als wesentlicher Bestandteil der Lampe fertig.The low-pressure discharge lamp is produced in a simple manner. The preformed plate plays a major part in this. To manufacture it, a glass tube, the diameter of which corresponds to the central part of the finished preformed plate, is placed on one end, which creates the outward edge of the plate. This plate blank is placed in a rotating receptacle, which also causes it to rotate, and the upper, cylindrical area is gradually brought to a temperature suitable for the deformation of the glass. An inner mold is then inserted into the heated plate blank from above and two outer mold halves are closed from the outside around the upper part, as a result of which the heated upper plate part is given the desired shape of the receiving part with the elongated, round opening. The holder for the plate does not turn during the forming process. The shaping tools for the elongated round opening of the receiving part can be designed differently. So z. B. the elongated round opening straight or indented side surfaces, similar to an eight. After the deformed glass has regained sufficient strength, the inner mold is extended again, a scraper preventing the preformed plate from getting caught on the inner mold, and the outer mold halves are opened again. After the final tempering process, the preformed divider is ready for further processing as an integral part of the lamp.

Bei der sich anschließenden Lampenfertigung weist ein mit den vorheizbaren Elektroden versehenes Gestell vorteilhaft einteilige Stromzuführungen auf, die z. B. mittels eines Perifußes gehaltert sein können. Es sind jedoch ebenso während des Quetschvorganges 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 gesetzt. Anschließend werden von oben die zwei U-förmigen Innenrohre mit jeweils ihren ersten geraden Schenkeln derart in den oberen, 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. Die Weiterverarbeitung zur fertigen Lampe erfolgt weitgehend nach bekannten Arbeitsschritten. So wird die Verschmelzung des Außenkolbens mit dem unteren, 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.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 perifoot. However, racks held in a receptacle are also conceivable during the squeezing process. Instead of the one-part power supply, multi-part power supplies can also be used. The preformed plate is placed 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 upper, 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. The further processing to the finished lamp is largely carried out according to known work steps. For example, the outer bulb is fused with the lower edge of the plate, which is arranged concentrically to the lamp axis, on a melting machine with neck waste, or the piston neck brought to the deformation temperature is pressed against the heated edge of the plate by means of a roller. After pumping, filling and socketing, the lamp is ready for operation.

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.In addition to compact dimensions, the low-pressure discharge lamp according to the invention has good lighting properties. The interior structure described above is both constructive as well as technically simple and results in a sufficient length of the discharge path.

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 Innenrohres
  • 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
  • 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, zum Lampeninnern gerichteten Aufnahmeteil 2 auf, der in der Draufsicht die Form einer länglichrunden Öffnung hat. 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 End- . stücke der länglichrunden Öffnung verbindenden Teilstücke zur Lampenlängsachse Einschnürungen 16 auf, wodurch angenähert die Form einer Acht entsteht. Der untere, nach außen gerichtete Rand 3 des Tellers 1 ist kreisrund gestaltet und bildet die künftige Verschmelzungslinie mit dem Außenkolben. Der Mittelteil 4 zwischen dem Aufnahmeteil 2 und dem Rand 3 wird durch ein im wesentlichen hohlzylinderförmiges Stück gebildet, dessen Durchmesser sowohl kleiner als der des Randes 3 wie auch kleiner als die Länge L des Aufnahmeteils 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 receiving part 2 directed towards the inside of the lamp, which has the shape of an elongated, round opening in plan view. 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 Figure 2b they have the semicircular end. Pieces of the elongated round opening connecting pieces to the lamp longitudinal axis constrictions 16, which approximately creates the shape of an eight. The lower, outwardly directed edge 3 of the plate 1 is circular and forms the future line of fusion with the outer bulb. 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 both smaller than that of the edge 3 and smaller than the length L of the receiving part. 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 unteren 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.The squeezed, preassembled basic structure from FIG. 4 is then fitted with a tubular outer bulb 10 with an outer diameter of approximately 38 mm to approximately 50 mm, which is fused to the lower 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 der Verschmelzung zwischen Außenkolben 10 und dem Rand 3 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 fusion between the outer bulb 10 and the edge 3 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. 15 W weist die Lampe eine Brennspannung von ca. 100 V und einen Lampenstrom von ca. 170 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 power input of approx. 15 W, the lamp has an operating voltage of approx. 100 V and a lamp current of approx. 170 mA. The luminous flux is around 1 000 Im.

Claims (9)

1. A single-ended low-pressure discharge lamp comprising a stem member (1), an exhaust tube (11) sealed in the stem member (1), an outer envelope (10) which is hermetically sealed to the stem member (1) and contains a fill of gas and/or metal vapor, two preheatable electrodes (12, 12') arranged at the stem member (1) within the outer envelope (10), and at least one U-shaped inner tube (5, 5') of glass which is also disposed within the outer envelope (10), with the end (8) of one of the straight legs (6) of each inner tube (5, 5') hermetically surrounding a preheatable electrode (12, 12') and the end of the other of the straight legs (7) having an aperture (9) open to the interior of the outer envelope (10), the aperture being arranged adjacent the stem member (1), characterized in that the stem member is a preshaped flare (1) of glass comprising an upper, oval reception section (2), facing the interior of the lamp and in which are sealingly mounted the two preheatable electrodes (12, 12') and the end (8) of the respective one straight leg (6) of each U-shaped inner tube (5, 5'), the reception section (2) being provided with a lower, outwardly facing rim (3) which is concentric with the longitudinal axis of the lamp and which is fused to the outer envelope (10), and the reception section (2) and the rim (3) being connected by a hollow cylindrical middle section (4) whose diameter is smaller than the diameter of the rim (3) and the length (L) of the reception section.
2. A low-pressure discharge lamp as claimed in claim 1, characterized in that each preheatable electrode (12, 12') is associated with a U-shaped inner tube, with the longitudinal axes of the straight legs of the U-shaped inner tubes (5, 5') forming, in top view, the corners of a rhombus or of a square whose diagonals (D, D') form an intersection point lying on the longitudinal axis of the lamp.
3. A low-pressure discharge lamp as claimed in claims 1 and 2, characterized in that the hermetic seal of the first ends (8) of the U-shaped inner tubes (5, 5') with the preheatable electrodes (12, 12') and the upper reception section (2) of the preshaped flare (1) facing the interior of the lamp comprises a press seal, the length of the press seal corresponding approximately with the length L of the reception section (2).
4. A low-pressure discharge lamp as claimed in claims 1 to 3, characterized in that the hermetic seal of the outer envelope (10) and the lower, outwardly facing rim (3) of the preshaped flare (1) forms, in top view, a circle whose center point lies on the longitudinal lamp axis.
5. A low-pressure discharge lamp as claimed in claims 1 to 4, characterized in that the inner surface of the U-shaped inner tubes (5, 5') and/or of the outer envelope (10) is provided with a phosphor coating.
6. A low-pressure discharge lamp as claimed in claim 5, characterized in that the phosphor coating comprises three different phosphor components.
7. A low-pressure discharge lamp as claimed in claims 1 to 6, characterized in that the inner surface of the outer envelope (10) comprises a light diffusing surface.
8. A method of manufacturing a preshaped flare for a single-ended low-pressure discharge lamp as claimed in claims 1 to 7, characterized in that the following working steps are carried out :
a) expanding an end portion of a glass tube whose diameter corresponds with the middle section (4) of the preshaped flare (1) whereby the outwardly facing rim (3) is provided ;
b) heating of the upper cylindrical section of the flare blank of glass, which is held in a reception member, to a temperature suited for the deformation of the glass, while the reception member and thus the flare blank are being rotated ;
c) inserting an inner mold member, which corresponds with an oval opening of the reception section (2), into the flare blank and subsequently closing outer mold members around the oval opening of the reception section (2), the rotation of the flare blank being stopped during the shaping process by means of the molds ;
d) removing the inner mold member from the preshaped flare (1) and subsequently opening the outer mold members, with a stripper preventing the preshaped flare (1) from sticking to the inner mold member.
9. A method of manufacturing a single-ended discharge lamp as claimed in claims 1 to 7, characterized in that substantially the following working steps are carried out :
a) holding of the lead-in wires (13, 13') which are provided with the preheatable electrodes (12, 12') in relation to the preshaped flare (1) so that the portions of the lead- in wires which are to be sealed in are arranged at the height of the reception section (2) of the flare (1) ;
b) inserting the respective first ends (8) of the U-shaped inner tubes (5, 5') into the oval reception section (2) of the preshaped flare (1), the first ends each surrounding a respective preheatable electrode (12, 12') ;
c) heating the reception section (2) of the preshaped flare (1) to a temperature suited for the deformation of the glass, with the first ends (8) of the U-shaped inner tubes (5, 5') located therein and being heated simultaneously ;
d) carrying out a press-sealing process of the positioned, softened glass members, the hermetic sealing of the two U-shaped inner tubes (5, 5') being effected in one working step ;
e) placing the outer envelope (10) over the assembly so obtained, with the lower portion of the outer envelope projecting a certain distance beyond the outwardly facing rim (3) of the preshaped flare (1) ;
f) heating of the continuously rotating assembly so obtained in the region of the lower, outwardly facing rim (3) of the preshaped flare (1) to a temperature suited for the deformation of the glass, whereby the portion of the outer envelope (10) projecting beyond the rim of the flare falls off due to its own weight, and a hermetic seal results between the outer envelope (10) and the heated rim (3) of the flare (1) ; or
g) heating of the continuously rotating assembly in the region of the lower, outwardly facing rim (3) of the preshaped flare (1) to a temperature suited for the deformation of the glass, whereby the heated portion of the outer envelope (10) is pressed against the heated rim (3) of the flare (1) with a roller so as to be hermetically sealed thereto.
EP82109150A 1981-10-06 1982-10-04 One-base low-pressure discharge lamp, and method of manufacturing it Expired EP0076503B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3139732 1981-10-06
DE19813139732 DE3139732A1 (en) 1981-10-06 1981-10-06 LOW PRESSURE DISCHARGE LAMP BASED ON ONE SIDE AND METHOD FOR PRODUCING THE SAME

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EP0076503A2 EP0076503A2 (en) 1983-04-13
EP0076503A3 EP0076503A3 (en) 1983-11-09
EP0076503B1 true EP0076503B1 (en) 1987-01-21

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EP (1) EP0076503B1 (en)
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DE (2) DE3139732A1 (en)

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* Cited by examiner, † Cited by third party
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JPS58216334A (en) * 1982-06-11 1983-12-16 Hitachi Ltd Manufacture of bulb type fluorescent lamp
DE3307780A1 (en) * 1983-03-04 1984-09-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München LOW PRESSURE DISCHARGE LAMP BASED ON ONE SIDE AND METHOD FOR PRODUCING THE SAME
DE3307763A1 (en) * 1983-03-04 1984-09-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München LOW-PRESSURE DISCHARGE LAMP BASED ON ONE SIDE
JPS6027254U (en) * 1983-07-26 1985-02-23 株式会社ミクニ Combustion control circuit
GB9407128D0 (en) * 1994-04-11 1994-06-01 Ge Lighting Ltd A phosphor coating arrangement for an electrodeless discharge lamp
US5528105A (en) * 1994-07-15 1996-06-18 General Electric Company Copper-steel composite lead wire and use in incandescent filament electric lamps
JPH10125231A (en) * 1996-10-25 1998-05-15 Stanley Electric Co Ltd Fluorescent lamp for indicator light
WO2007130126A1 (en) * 2006-04-28 2007-11-15 Eveready Battery Company, Inc. Improved lens and lens arrangement

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Publication number Priority date Publication date Assignee Title
US2001501A (en) * 1933-03-10 1935-05-14 Gen Electric Gaseous electric discharge device
JPS4935796A (en) * 1972-08-09 1974-04-02
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
JPS5778749A (en) * 1980-10-31 1982-05-17 Matsushita Electric Works Ltd Fabrication of low pressure discharge lamp

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EP0076503A3 (en) 1983-11-09
DE3275252D1 (en) 1987-02-26
US4441050A (en) 1984-04-03
JPS5871555A (en) 1983-04-28
EP0076503A2 (en) 1983-04-13
DE3139732A1 (en) 1983-04-21

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