EP1517359B1 - Method of manufacturing of a flat discharge lamp with spacer elements - Google Patents

Method of manufacturing of a flat discharge lamp with spacer elements Download PDF

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Publication number
EP1517359B1
EP1517359B1 EP04019086A EP04019086A EP1517359B1 EP 1517359 B1 EP1517359 B1 EP 1517359B1 EP 04019086 A EP04019086 A EP 04019086A EP 04019086 A EP04019086 A EP 04019086A EP 1517359 B1 EP1517359 B1 EP 1517359B1
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EP
European Patent Office
Prior art keywords
base plate
spacer
plate
solder
cover plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP04019086A
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German (de)
French (fr)
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EP1517359A2 (en
EP1517359A3 (en
Inventor
Ahmet Oran
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Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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Publication of EP1517359A3 publication Critical patent/EP1517359A3/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
    • 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
    • H01J61/305—Flat vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/26—Sealing together parts of vessels
    • H01J9/265—Sealing together parts of vessels specially adapted for gas-discharge tubes or lamps
    • H01J9/266—Sealing together parts of vessels specially adapted for gas-discharge tubes or lamps specially adapted for gas-discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel

Definitions

  • the invention relates to a method for producing a flat discharge lamp, also abbreviated hereafter as a flat lamp.
  • the invention is directed to the production of flat lamps, which are designed for dielectrically impeded discharges, in which therefore at least the electrodes of one polarity are separated by a dielectric layer from the discharge medium in the interior of the discharge vessel.
  • Lamps of this type are also known as dielectric barrier discharge lamps.
  • Such lamps are suitable in addition to general lighting, inter alia, for the backlighting of liquid crystal displays (LCD) as well as for decoration and advertising purposes.
  • LCD liquid crystal displays
  • Flat lamps of the generic type have a discharge vessel, which is formed by a bottom plate, a ceiling plate and a frame arranged therebetween.
  • a discharge vessel which is formed by a bottom plate, a ceiling plate and a frame arranged therebetween.
  • the technology of flat lamps for dielectrically impeded discharges is required as the prior art.
  • the discharge vessel of this flat lamp comprises two mutually parallel plates, a frame and spacers which support the two plates against each other.
  • Each spacer consists of a highly viscous at low temperature and a low-viscosity component.
  • the respective vertical dimension of each spacer is greater than the intended end distance of the two plates.
  • the thus initially kept free circumferential gap-like opening serves as a pump or filling opening of the discharge vessel.
  • the low-viscosity component of each spacer element compensates for possible assembly of the discharge vessel possible local deviations of the distances between the two plates.
  • a disadvantage is the associated with the two-piece spacers high production costs. In addition, it may happen that a spacer, which is a little too short to be clamped between the plates, tilts before joining by the convection current in the joining furnace, thereby scrap.
  • the object of the present invention is to avoid the aforementioned disadvantages and to provide an improved method for the production of flat discharge lamps.
  • a method for producing a flat discharge lamp, in particular a flat dielectric barrier discharge lamp, the discharge vessel having a base plate, a cover plate and a frame and at least one spacer element between base plate and cover plate and filled with a discharge medium is, with the following method steps: Provision of a solder bath, immersing one end of the at least one spacer element in the solder bath, applying the at least one spacer element with the immersed end on the inside of the base plate such that the at least one spacer element (3) by means of the solder paste (5 ) of the Lotbads on the inside of the base plate (6) adheres, characterized in that a plurality of spacer elements (3) are each taken with one end in an order plate (1) and held, are immersed with the other end temporarily in the Lotbad, with the end, which was immersed in the solder bath on the base plate (6) are applied and finally released from the order plate (1).
  • the solder bath consists of a suitable solder paste, in particular a glass solder paste.
  • a suitable solder paste low melting glass solder mixed with a binder, e.g. Lead borosilicate, zinc borate or bismuth based glass solders.
  • the method according to the invention offers, inter alia, the advantage that the spacer elements are already covered by the solder paste, i. adhere to the base plate before the melting of the solder, so that they are secured against falling over in the subsequent manufacturing steps.
  • the solder paste namely forms a thin film in the respective contact area between the spacer and the base plate, so that the spacer elements adhere to the base plate by means of capillary adhesion.
  • a large number of spacer elements for example 288 pieces in a 21.3-inch diagonal lamp-are preferably all immersed in the solder bath in a common process step and then in a further process step on the baseplate applied.
  • a plurality of spacer elements are each taken with one end in an order plate and held, for example, by suction, each with the other end temporarily submerged in the solder bath, then positioned over the base plate and finally triggered from the order plate, for example by blowing, so that Finally, the spacer elements each with the end that dipped into the solder bath was stuck to the base plate.
  • the order plate is provided with corresponding recesses for receiving the spacer elements.
  • the arrangement of the recesses in the order plate must correspond to the intended positions of the spacers on the base plate.
  • the pre-assembled structure is completed before joining in the joining furnace with a cover plate and a surrounding frame, which is arranged between base plate and cover plate. Between the frame and cover plate some Lottabletten are arranged to form a pumping gap. The latter soften upon reaching the joining temperature and close the base plate including the spacer elements, with the frame and the cover plate to the actual discharge vessel of the flat discharge lamp.
  • the pre-assembled structure is oriented in the joining furnace introduced so that the inside of the base plate pointing down and consequently hang the spacers down.
  • spacer elements In principle, different shapes for the spacer elements into consideration, but preferably cylindrical, in particular with a circular cross-section.
  • FIGS. 1a, 1b and 2a-2d show the same features in the figures.
  • the previously required manufacturing steps such as the application of the electrode tracks, the dielectric barrier layer and the phosphor layer will not be discussed in detail here, as they are for the understanding of the invention without meaning (therefore not shown here for simplicity). Incidentally, this is on the already mentioned above font WO 98/43277 directed.
  • FIG. 1a shows, by way of example and roughly schematically, an order plate 1 made of aluminum, with only eight circular depressions 2 for the sake of clarity, for accommodating likewise eight cylindrical spacer elements 3 (see Figure 1b).
  • the order plate with the spacer elements is positioned above the glass base plate of the discharge lamp in such a way that the glass solder wetted ends of the spacer elements are just above the surface of the base plate.
  • the spacer elements are triggered by blowing out of the order plate and pressed onto the base plate.
  • the spacers 3 adhere by means of the glass solder paste 5 on the base plate 6 and can not fall over in the subsequent manufacturing steps.
  • a circumferential frame 7 is applied to the base plate 6 by means of glass solder, two glass solder tablets 8 on each of the four sides of the frame 7 and finally a cover plate 9 made of glass mm high glass solder pellets 8 serve to first create a gap 10 between the frame 7 and cover plate 9.
  • the cover plate 9 coated on its inside with phosphor touches the spacer elements 3 (not visible in FIG. 2c), which is why this phosphor layer can no longer scratch during assembly.
  • the entire preassembled structure is placed in an evacuable joining furnace (not shown).
  • the temperature in the joining furnace is increased so far that the glass solder pellets 8 melt and the Frame 7 with base 6 and cover plate 9 are closed to a gas-tight discharge vessel (see Figure 2d).
  • the preassembled structure can also be reversed, ie introduced with downwardly hanging spacer elements in the joining furnace. This has the advantage that the spacer elements can still align vertically when joining and then provide a flat support surface for the cover plate, since the glass soldering paste melts at the ends of the spacer elements when reaching the bonding temperature.
  • the inventive method has the advantage that the spacer elements in the convection current of the joining furnace due to the adhesion to the base plate by means of glass solder paste can not tip over. This can reduce the rejects.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

The method involves providing a solder bath comprising solder paste (5). One end of spacers (3) that are provided between a frame and a cover plate is dipped in the bath. The dipped-in end of the spacer is then applied to an inner side of a base plate (6) such that the spacers adhere to the inner side of the plate by the solder paste from the solder bath.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Verfahren zur Herstellung einer flachen Entladungslampe, im Folgenden auch verkürzend als Flachlampe bezeichnet.The invention relates to a method for producing a flat discharge lamp, also abbreviated hereafter as a flat lamp.

Insbesondere richtet sich die Erfindung auf die Herstellung von Flachlampen, die für dielektrisch behinderte Entladungen ausgelegt sind, bei denen also zumindest die Elektroden einer Polarität durch eine dielektrische Schicht von dem Entladungsmedium im Innern des Entladungsgefäßes getrennt sind. Lampen diesen Typs sind auch als dielektrische Barriere-Entladungslampen bekannt.In particular, the invention is directed to the production of flat lamps, which are designed for dielectrically impeded discharges, in which therefore at least the electrodes of one polarity are separated by a dielectric layer from the discharge medium in the interior of the discharge vessel. Lamps of this type are also known as dielectric barrier discharge lamps.

Derartige Lampen eignen sich neben der Allgemeinbeleuchtung unter anderem auch zur Hinterleuchtung von Flüssigkristallanzeigen (LCD) sowie zu Dekorations- und Werbezwecken.Such lamps are suitable in addition to general lighting, inter alia, for the backlighting of liquid crystal displays (LCD) as well as for decoration and advertising purposes.

Stand der TechnikState of the art

Flachlampen des gattungsgemäßen Typs weisen ein Entladungsgefäß auf, welches durch eine Bodenplatte, eine Deckenplatte sowie einen dazwischen angeordneten Rahmen gebildet ist. Im übrigen wird hier die Technologie von Flachlampen für dielektrisch behinderte Entladungen als Stand der Technik vorausgesetzt. Als Beispiel wird zudem verwiesen auf die Schrift WO 98/43277 .Flat lamps of the generic type have a discharge vessel, which is formed by a bottom plate, a ceiling plate and a frame arranged therebetween. Incidentally, the technology of flat lamps for dielectrically impeded discharges is required as the prior art. As an example, reference is also made to the font WO 98/43277 ,

Aus der Schrift DE 198 17 478 A1 ist eine flache Entladungslampe der gattungsgemäßen Art bekannt. Das Entladungsgefäß dieser Flachlampe umfasst zwei zueinander parallele Platten, einen Rahmen sowie Abstandselemente, die die beiden Platten gegeneinander abstützen. Jedes Abstandselement besteht aus einer bei Fügetemperatur hochviskosen und einer niederviskosen Komponente. Vor dem Zusammenfügen des Entladungsgefäßes ist die jeweilige vertikale Abmessung jedes Abstandselements größer als der vorgesehene Endabstand der beiden Platten. Die dadurch zunächst freigehaltene umlaufende spaltartige Öffnung dient als Pump- bzw. Füllöffnung des Entladungsgefäßes. Die jeweils niederviskose Komponente jedes Abstandselements gleicht beim Zusammenfügen des Entladungsgefäßes mögliche lokale Abweichungen der Abstände zwischen beiden Platten aus. Nachteilig ist der mit den zweiteiligen Abstandselementen verbundene hohe Fertigungsaufwand. Außerdem kann es passieren, dass ein Abstandselement, welches ein wenig zu kurz ist, um zwischen den Platten geklemmt zu sein, vor dem Fügen durch den Konvektionsstrom im Fügeofen umkippt und dadurch Ausschuss entsteht.From the Scriptures DE 198 17 478 A1 is a flat discharge lamp of the generic type is known. The discharge vessel of this flat lamp comprises two mutually parallel plates, a frame and spacers which support the two plates against each other. Each spacer consists of a highly viscous at low temperature and a low-viscosity component. Before assembly of the discharge vessel, the respective vertical dimension of each spacer is greater than the intended end distance of the two plates. The thus initially kept free circumferential gap-like opening serves as a pump or filling opening of the discharge vessel. The low-viscosity component of each spacer element compensates for possible assembly of the discharge vessel possible local deviations of the distances between the two plates. A disadvantage is the associated with the two-piece spacers high production costs. In addition, it may happen that a spacer, which is a little too short to be clamped between the plates, tilts before joining by the convection current in the joining furnace, thereby scrap.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung ist es, die vorgenannten Nachteile zu vermeiden und ein verbessertes Verfahren zur Herstellung von flachen Entladungslampen anzugeben.The object of the present invention is to avoid the aforementioned disadvantages and to provide an improved method for the production of flat discharge lamps.

Diese Aufgabe wird gelöst durch ein Verfahren zur Herstellung einer flachen Entladungslampe, insbesondere einer flachen dielektrischen Barriere-Entladungslampe, deren Entladungsgefäß eine Grundplatte, eine Deckplatte und einen Rahmen sowie mindestens ein Abstandselement zwischen Grundplatte und Deckplatte aufweist und mit einem Entladungsmedium gefüllt ist, mit folgenden Verfahrensschritten: Bereitstellen eines Lotbades, Eintauchen eines Endes des mindestens einen Abstandselements in das Lotbad, Aufbringen des mindestens einen Abstandselements mit dem eingetauchten Ende auf der Innenseite der Grundplatte derart, dass das mindestens eine Abstandselement (3) mittels der Lotpaste (5) des Lotbads auf der Innenseite der Grundplatte (6) haftet, dadurch gekennzeichnet, dass eine Vielzahl von Abstandselementen (3) jeweils mit einem Ende in einer Ordnungsplatte (1) aufgenommen und festgehalten werden, mit dem anderen Ende vorübergehend in das Lotbad getaucht werden, mit dem Ende, das in das Lotbad getaucht war auf der Grundplatte (6) aufgebracht werden und schließlich aus der Ordnungsplatte (1) gelöst werden.This object is achieved by a method for producing a flat discharge lamp, in particular a flat dielectric barrier discharge lamp, the discharge vessel having a base plate, a cover plate and a frame and at least one spacer element between base plate and cover plate and filled with a discharge medium is, with the following method steps: Provision of a solder bath, immersing one end of the at least one spacer element in the solder bath, applying the at least one spacer element with the immersed end on the inside of the base plate such that the at least one spacer element (3) by means of the solder paste (5 ) of the Lotbads on the inside of the base plate (6) adheres, characterized in that a plurality of spacer elements (3) are each taken with one end in an order plate (1) and held, are immersed with the other end temporarily in the Lotbad, with the end, which was immersed in the solder bath on the base plate (6) are applied and finally released from the order plate (1).

Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.Particularly advantageous embodiments can be found in the dependent claims.

Das Lotbad besteht aus einer geeigneten Lotpaste, insbesondere einer Glaslotpaste. Als Glaslotpaste eignet sich mit einem Binder vermischte niedrigschmelzende Glaslote, z.B. Bleiborsilikat, Zinkborat oder auch Wismutbasierte Glaslote.The solder bath consists of a suitable solder paste, in particular a glass solder paste. As glass solder paste, low melting glass solder mixed with a binder, e.g. Lead borosilicate, zinc borate or bismuth based glass solders.

Das erfindungsgemäße Verfahren bietet unter anderem den Vorteil, dass die Abstandselemente bereits durch die Lotpaste, d.h. vor dem Aufschmelzen des Lotes an der Grundplatte haften, so dass sie vor dem Umfallen in den nachfolgenden Fertigungsschritten gesichert sind. Beim Aufsetzen der Abstandselemente auf die Grundplatte bildet die Lotpaste nämlich einen dünnen Film im jeweiligen Kontaktbereich zwischen Abstandselement und Grundplatte, so dass die Abstandselemente mittels Kapillarhaftung an der Grundplatte haften.The method according to the invention offers, inter alia, the advantage that the spacer elements are already covered by the solder paste, i. adhere to the base plate before the melting of the solder, so that they are secured against falling over in the subsequent manufacturing steps. When placing the spacer elements on the base plate, the solder paste namely forms a thin film in the respective contact area between the spacer and the base plate, so that the spacer elements adhere to the base plate by means of capillary adhesion.

Außerdem werden die bei großflächigen Lampen sehr zahlreichen Abstandselemente - z.B. 288 Stück bei einer Lampe mit 21,3 Zoll Diagonale - vorzugsweise allesamt in einem gemeinsamen Verfahrensschritt in das Lotbad getaucht und danach in einem weiteren Verfahrensschritt auf die Grundplatte aufgebracht. Dazu wird eine Vielzahl von Abstandselementen jeweils mit einem Ende in einer Ordnungsplatte aufgenommen und festgehalten, z.B. durch Ansaugen, jeweils mit dem anderen Ende vorübergehend in das Lotbad getaucht, anschließend über der Grundplatte positioniert und schließlich aus der Ordnungsplatte ausgelöst, z.B. durch Ausblasen, so dass schlussendlich die Abstandselemente jeweils mit dem Ende, das in das Lotbad getaucht war auf der Grundplatte haften. Zu diesem Zweck ist die Ordnungsplatte mit entsprechenden Vertiefungen zur Aufnahme der Abstandselemente versehen. Außerdem muss die Anordnung der Vertiefungen in der Ordnungsplatte den vorgesehenen Positionen der Abstandselemente auf der Grundplatte entsprechen.In addition, in the case of large-area lamps, a large number of spacer elements-for example 288 pieces in a 21.3-inch diagonal lamp-are preferably all immersed in the solder bath in a common process step and then in a further process step on the baseplate applied. For this purpose, a plurality of spacer elements are each taken with one end in an order plate and held, for example, by suction, each with the other end temporarily submerged in the solder bath, then positioned over the base plate and finally triggered from the order plate, for example by blowing, so that Finally, the spacer elements each with the end that dipped into the solder bath was stuck to the base plate. For this purpose, the order plate is provided with corresponding recesses for receiving the spacer elements. In addition, the arrangement of the recesses in the order plate must correspond to the intended positions of the spacers on the base plate.

Komplettiert wird der vormontierte Aufbau vor dem Fügen im Fügeofen mit einer Deckplatte und einen umlaufenden Rahmen, der zwischen Grundplatte und Deckplatte angeordnet ist. Zwischen Rahmen und Deckplatte sind einige Lottabletten zur Bildung eines Pumpspaltes angeordnet. Letztere erweichen beim Erreichen der Fügetemperatur und verschließen die Grundplatte einschließlich der Abstandselemente, mit dem Rahmen und der Deckplatte zum eigentlichen Entladungsgefäß der flachen Entladungslampe.The pre-assembled structure is completed before joining in the joining furnace with a cover plate and a surrounding frame, which is arranged between base plate and cover plate. Between the frame and cover plate some Lottabletten are arranged to form a pumping gap. The latter soften upon reaching the joining temperature and close the base plate including the spacer elements, with the frame and the cover plate to the actual discharge vessel of the flat discharge lamp.

In einer Variante wird der vormontierte Aufbau so orientiert in den Fügeofen eingebracht, dass die Innenseite der Grundplatte nach unten zeigt und folglich die Abstandselemente nach unten hängen. Das hat den Vorteil, dass sich die Abstandselemente beim Fügen noch senkrecht ausrichten können und danach eine ebene Auflagefläche für die Deckplatte bieten, da die Glaslotpaste an den Enden der Abstandselemente aufschmilzt. Beim Fügen werden außerdem gegebenenfalls minimale Höhenunterschiede ausgleichen, da die Glasplatten bei der Fügetemperatur leicht erweichen und durch den Unterdruck in der Lampe die Abstandselemente letztendlich bündig an die Glasplatten gepresst werden.In a variant, the pre-assembled structure is oriented in the joining furnace introduced so that the inside of the base plate pointing down and consequently hang the spacers down. This has the advantage that the spacer elements can still align vertically when joining and then provide a flat support surface for the cover plate, since the glass soldering paste melts at the ends of the spacer elements. When joining also possibly compensate for minimal differences in height, since the glass plates soften slightly at the joining temperature and the spacer elements are ultimately pressed flush to the glass plates by the negative pressure in the lamp.

Prinzipiell kommen unterschiedliche Formen für die Abstandselemente in Betracht, vorzugsweise aber zylindrische, insbesondere mit kreisförmigem Querschnitt.In principle, different shapes for the spacer elements into consideration, but preferably cylindrical, in particular with a circular cross-section.

Um die obige Erläuterung der Erfindung nicht unnötig zu verkomplizieren, wurde auf die Beschreibung der die Elektroden der Flachlampe betreffenden und an sich bekannten Fertigungsschritte verzichtet. Außerdem spielen die Elektroden für die Erfindung allenfalls eine untergeordnete Rolle.In order not to unnecessarily complicate the above explanation of the invention, the description of the production steps relating to the electrodes of the flat lamp and known per se has been dispensed with. In addition, the electrodes for the invention play at most a minor role.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Folgenden soll die Erfindung anhand eines Ausführungsbeispiels näher erläutert werden. Die Figuren zeigen:

Fig. 1a
eine Ordnungsplatte zur Aufnahme von Abstandselementen,
Fig. 1b
die Ordnungsplatte aus Fig. 1a mit eingesetzten Abstandselementen,
Fig. 2a
eine Seitenansicht einer Grundplatte einer Flachlampe mit aufgesetzten Abstandselementen,
Fig. 2b
eine Draufsicht der Grundplatte mit den aufgesetzten Abstandselementen aus Fig. 2a,
Fig. 2c
die Grundplatte aus Fig. 2a mit vormontiertem Rahmen und Deckplatte,
Fig. 2d
die aus Fig. 2c fertig gefügte Flachlampe.
In the following, the invention will be explained in more detail with reference to an embodiment. The figures show:
Fig. 1a
an order plate for receiving spacers,
Fig. 1b
the order plate of Fig. 1a with inserted spacers,
Fig. 2a
a side view of a base plate of a flat lamp with patch spacers,
Fig. 2b
a top view of the base plate with the attached spacer elements of Fig. 2a,
Fig. 2c
the base plate of Fig. 2a with pre-assembled frame and cover plate,
Fig. 2d
the finished from Fig. 2c finished flat lamp.

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Zur Erläuterung der erfindungsgemäßen Fertigungsschritte einer flachen dielektrischen Barriere-Entladungslampe wird im Folgenden Bezug auf die Figuren 1a, 1b sowie 2a - 2d genommen. Dabei sind gleiche Merkmale in den Figuren mit gleichen Bezugsziffern versehen. Auf die an sich vorher erforderlichen Fertigungsschritte wie das Aufbringen der Elektrodenbahnen, der dielektrischen Barriere-Schicht und der Leuchtstoffschicht soll hier nicht näher eingegangen werden, da sie für das Verständnis der Erfindung ohne Bedeutung sind (deshalb der Einfachheit halber hier nicht dargestellt). Im übrigen wird hierzu auf die bereits eingangs erwähnte Schrift WO 98/43277 verwiesen. Figur 1a zeigt exemplarisch und grob schematisch eine Ordnungsplatte 1 aus Aluminium mit - der Übersichtlichkeit wegen - nur acht kreisförmigen Vertiefungen 2 zur Aufnahme von ebenfalls acht zylindrischen Abstandselementen 3 (siehe Figur 1b). An diese Stelle sei angemerkt, dass je nach Größe einer Flachlampe erheblich mehr Abstandselemente erforderlich sind, bei einer Lampe mit 54,1 cm (21,3'') Diagonale beispielsweise 288 Abstandselemente. Die ca. 4,3 mm langen Abstandselemente 3 werden in die Vertiefungen 2 eingeführt und über einen an die Ordnungsplatte 1 angeschlossenen Schlauch 4, der mit einer Saug- bzw. Druckluftanlage (nicht dargestellt) verbunden ist, angesaugt. Dadurch kann die Ordnungsplatte 1 einschließlich der Abstandselemente 3 umgedreht werden, ohne dass die Abstandselemente 3 aus ihren Vertiefungen 2 fallen. Nun wird die Ordnungsplatte 1 einschließlich der Abstandselemente 3 über ein Bad aus Glaslot Al 10104 gebracht derart, dass die freien Enden der Abstandselemente 3 in das Lotbad eintauchen (nicht dargestellt). Anschließend wird die Ordnungsplatte mit den Abstandselementen über der aus Glas bestehenden Grundplatte der Entladungslampe positioniert derart, dass die mit Glaslot benetzten Enden der Abstandselemente knapp über der Oberfläche der Grundplatte sind. Danach werden die Abstandselemente durch Ausblasen aus der Ordnungsplatte ausgelöst und auf die Grundplatte gepresst. Nun haften die Abstandselemente 3 mittels der Glaslotpaste 5 auf der Grundplatte 6 und können in den nachfolgenden Fertigungsschritten nicht mehr umfallen. Zur Komplettierung des flachen Entladungsgefäßes der Lampe wird auf die Grundplatte 6 mittels Glaslot ein umlaufender Rahmen 7 aufgebracht, auf jede der vier Seiten des Rahmens 7 jeweils zwei Glaslottabletten 8 und darauf schließlich eine aus Glas bestehende Deckplatte 9. Die insgesamt acht ca. 2,4 mm hohen Glaslottabletten 8 dienen dazu, zunächst einen Spalt 10 zwischen Rahmen 7 und Deckplatte 9 zu schaffen. Als positiver Nebeneffekt berührt die auf seiner Innenseite mit Leuchtstoff (nicht dargestellt) beschichtete Deckplatte 9 die Abstandselemente 3 (in Figur 2c nicht erkennbar) nicht mehr, weshalb diese Leuchtstoffschicht bei der Montage auch nicht mehr Verkratzen kann. Nun wird der gesamte vormontierte Aufbau in einen evakuierbaren Fügeofen (nicht dargestellt) gebracht. Nach dem Spülen, Ausheizen und Befüllen mit dem Entladungsgas, wozu der oben erwähnte Spalt 10 dient, wird die Temperatur im Fügeofen soweit erhöht, dass die Glaslottabletten 8 schmelzen und der Rahmen 7 mit Grund- 6 und Deckplatte 9 zu einem gasdichten Entladungsgefäß verschlossen werden (siehe Figur 2d). Alternativ kann der vormontierte Aufbau auch umgedreht, d.h. mit nach unten hängenden Abstandselementen, in den Fügeofen eingebracht werden. Das hat den Vorteil, dass sich die Abstandselemente beim Fügen noch senkrecht ausrichten können und danach eine ebene Auflagefläche für die Deckplatte bieten, da die Glaslotpaste an den Enden der Abstandselemente bei Erreichen der Fügetemperatur aufschmilzt.In order to explain the production steps of a flat dielectric barrier discharge lamp according to the invention, reference is made below to FIGS. 1a, 1b and 2a-2d. The same features in the figures are given the same reference numerals. The previously required manufacturing steps such as the application of the electrode tracks, the dielectric barrier layer and the phosphor layer will not be discussed in detail here, as they are for the understanding of the invention without meaning (therefore not shown here for simplicity). Incidentally, this is on the already mentioned above font WO 98/43277 directed. FIG. 1a shows, by way of example and roughly schematically, an order plate 1 made of aluminum, with only eight circular depressions 2 for the sake of clarity, for accommodating likewise eight cylindrical spacer elements 3 (see Figure 1b). At this point it should be noted that depending on the size of a flat lamp significantly more spacers are required, for example, in a lamp with 54.1 cm (21.3 '') diagonal, 288 spacers. The approximately 4.3 mm long spacer elements 3 are inserted into the recesses 2 and sucked via a connected to the ordnungsplatte 1 hose 4, which is connected to a suction or compressed air system (not shown). As a result, the order plate 1 including the spacers 3 can be turned over without the spacers 3 falling out of their recesses 2. Now, the order plate 1 including the spacers 3 is brought over a bath of glass solder Al 10104 such that the free ends of the spacers 3 dip into the Lotbad (not shown). Subsequently, the order plate with the spacer elements is positioned above the glass base plate of the discharge lamp in such a way that the glass solder wetted ends of the spacer elements are just above the surface of the base plate. Thereafter, the spacer elements are triggered by blowing out of the order plate and pressed onto the base plate. Now, the spacers 3 adhere by means of the glass solder paste 5 on the base plate 6 and can not fall over in the subsequent manufacturing steps. To complete the flat discharge vessel of the lamp, a circumferential frame 7 is applied to the base plate 6 by means of glass solder, two glass solder tablets 8 on each of the four sides of the frame 7 and finally a cover plate 9 made of glass mm high glass solder pellets 8 serve to first create a gap 10 between the frame 7 and cover plate 9. As a positive side effect, the cover plate 9 coated on its inside with phosphor (not shown) touches the spacer elements 3 (not visible in FIG. 2c), which is why this phosphor layer can no longer scratch during assembly. Now the entire preassembled structure is placed in an evacuable joining furnace (not shown). After rinsing, heating and filling with the discharge gas, to which the above-mentioned gap 10 is used, the temperature in the joining furnace is increased so far that the glass solder pellets 8 melt and the Frame 7 with base 6 and cover plate 9 are closed to a gas-tight discharge vessel (see Figure 2d). Alternatively, the preassembled structure can also be reversed, ie introduced with downwardly hanging spacer elements in the joining furnace. This has the advantage that the spacer elements can still align vertically when joining and then provide a flat support surface for the cover plate, since the glass soldering paste melts at the ends of the spacer elements when reaching the bonding temperature.

Jedenfalls bietet das erfindungsgemäße Verfahren den Vorteil, dass die Abstandselemente im Konvektionsstrom des Fügeofens aufgrund der Haftung an der Grundplatte mittels Glaslotpaste nicht mehr Umkippen können. Dadurch kann der Ausschuss reduziert werden.In any case, the inventive method has the advantage that the spacer elements in the convection current of the joining furnace due to the adhesion to the base plate by means of glass solder paste can not tip over. This can reduce the rejects.

Claims (12)

  1. Method for producing a flat discharge lamp, in particular a flat dielectric barrier discharge lamp, whose discharge vessel has a base plate (6), a frame (7) and a cover plate (9) as well as at least one spacer (3) between the base plate (6) and the cover plate (9) and is filled with a discharge medium, having the following method steps:
    • providing a solder bath comprising solder paste,
    • dipping one end of the at least one spacer (3) in the solder bath,
    • applying the dipped-in end of the at least one spacer (3) to the inner side of the base plate (6) such that the at least one spacer (3) adheres to the inner side of the base plate (6) by means of the solder paste (5) from the solder bath characterized in that a large number of spacers (3) are in each case
    • received and fixed at one end in an arrangement plate (1),
    • temporarily dipped in the solder bath at the other end,
    • applied to the base plate (6) at the end which was dipped in the solder bath, and finally
    • released from the arrangement plate (1).
  2. Method according to Claim 1, in which the spacers (3) are fixed in the arrangement plate (1) by being sucked on.
  3. Method according to Claim 1, in which the spacers (3) are released from the arrangement plate (1) by being blown out.
  4. Method according to one of the preceding claims, in which at least one interspace (10) is initially held open as the filling opening between the cover plate (9) and the frame (7).
  5. Method according to Claim 4, in which the interspace (10) is realized by one or more solder tablets (8) being arranged between the frame (7) and the cover plate (9).
  6. Method according to one of the preceding claims, in which the longitudinal extent of the at least one spacer (3) at right angles to the base plate (6) essentially corresponds to the final spacing between the inner sides of the base plate (6) and the cover plate (9).
  7. Method according to one of the preceding claims, in which the base plate (6) having the at least one spacer (3), the frame (7) and the cover plate (9) are joined in an evacuable furnace to form the discharge vessel.
  8. Method according to Claim 7, in which the furnace is filled with the discharge medium during the joining process.
  9. Method according to Claim 7 or 8, in which the preassembled construction comprising the base plate (6) having the at least one spacer (3), the frame (7) and the cover plate (9) is introduced to the joining furnace with such an orientation that the inner side of the base plate (6) points downward and, as a consequence, the at least one spacer (3) is suspended downward.
  10. Method according to one of the preceding claims, in which the discharge vessel has discharge electrodes which are at least partially isolated from the discharge medium in the interior of the discharge vessel by means of a dielectric layer.
  11. Method according to Claim 10, in which the electrodes are in the form of electrode paths arranged on the base plate of the discharge vessel.
  12. Method according to one of the preceding claims, in which the solder bath comprises a low-melting glass solder, for example lead borosilicate, zinc borate or else a bismuth-based glass solder.
EP04019086A 2003-09-17 2004-08-11 Method of manufacturing of a flat discharge lamp with spacer elements Not-in-force EP1517359B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343073A DE10343073A1 (en) 2003-09-17 2003-09-17 Method for producing a flat discharge lamp with spacers
DE10343073 2003-09-17

Publications (3)

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EP1517359A2 EP1517359A2 (en) 2005-03-23
EP1517359A3 EP1517359A3 (en) 2006-06-14
EP1517359B1 true EP1517359B1 (en) 2007-10-10

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EP (1) EP1517359B1 (en)
JP (1) JP2005100984A (en)
KR (1) KR100646896B1 (en)
CN (1) CN1599004A (en)
AT (1) ATE375601T1 (en)
CA (1) CA2481289A1 (en)
DE (2) DE10343073A1 (en)
TW (1) TWI261859B (en)

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DE102005021303A1 (en) * 2005-05-09 2006-11-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Manufacturing method for dielectrically restricted discharge lamp e.g. for monitors and display screens, has flat discharge vessel sealed by solder glass
TW200700840A (en) * 2005-06-28 2007-01-01 Delta Optoelectronics Inc Flat light

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1160700B (en) * 1977-10-25 1987-03-11 Bfg Glassgroup PANELS
US4666078A (en) * 1982-04-20 1987-05-19 Seiko Epson Kabushiki Kaisha Electroless plated terminals of display panel
US5424605A (en) * 1992-04-10 1995-06-13 Silicon Video Corporation Self supporting flat video display
GB2276270A (en) * 1993-03-18 1994-09-21 Ibm Spacers for flat panel displays
US5561340A (en) * 1995-01-31 1996-10-01 Lucent Technologies Inc. Field emission display having corrugated support pillars and method for manufacturing
US6433471B1 (en) * 1996-01-19 2002-08-13 Philips Electronics North America Corporation Plasma addressed liquid crystal display with glass spacers
US5708325A (en) * 1996-05-20 1998-01-13 Motorola Display spacer structure for a field emission device
US5811927A (en) * 1996-06-21 1998-09-22 Motorola, Inc. Method for affixing spacers within a flat panel display
WO1998043277A2 (en) * 1997-03-21 1998-10-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Flat fluorescent light for background lighting and liquid crystal display device fitted with said flat fluorescent light
DE19817478B4 (en) * 1998-04-20 2004-03-18 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Flat discharge lamp and process for its manufacture
US6607118B2 (en) * 2001-04-30 2003-08-19 Asm Assembly Automation Limited Apparatus and method for ball release

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US20050059312A1 (en) 2005-03-17
DE10343073A1 (en) 2005-04-21
CN1599004A (en) 2005-03-23
EP1517359A2 (en) 2005-03-23
TWI261859B (en) 2006-09-11
CA2481289A1 (en) 2005-03-17
KR100646896B1 (en) 2006-11-23
DE502004005186D1 (en) 2007-11-22
EP1517359A3 (en) 2006-06-14
ATE375601T1 (en) 2007-10-15
KR20050028314A (en) 2005-03-22
TW200523979A (en) 2005-07-16
JP2005100984A (en) 2005-04-14

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