EP0901687B1 - Flat light emitter - Google Patents

Flat light emitter Download PDF

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Publication number
EP0901687B1
EP0901687B1 EP98925420A EP98925420A EP0901687B1 EP 0901687 B1 EP0901687 B1 EP 0901687B1 EP 98925420 A EP98925420 A EP 98925420A EP 98925420 A EP98925420 A EP 98925420A EP 0901687 B1 EP0901687 B1 EP 0901687B1
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EP
European Patent Office
Prior art keywords
region
anode
anodes
case
flat radiator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98925420A
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German (de)
French (fr)
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EP0901687A1 (en
Inventor
Frank Vollkommer
Lothar Hitzschke
Jens Mücke
Rolf Siebauer
Simon Jerebic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HITZSCHKE, LOTHAR, DR.
VOLLKOMMER, FRANK, DR.
Osram GmbH
Original Assignee
Hitzschke Lothar Dr
Vollkommer Frank Dr
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/76—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • 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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/92—Lamps with more than one main discharge path
    • 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 is based on a flat radiator according to the preamble of Claim 1.
  • radiators such as in the EP 0 363 832 and disclosed in DE-OS 195 26 211.
  • Such radiators have at least one from the discharge space of the radiator by dielectric Material separated electrode.
  • Such electrodes are as follows also abbreviated as "dielectric electrodes”.
  • radiators are radiators with a flat surface Geometry meant that emit light, i.e. visible electromagnetic Radiation, or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation.
  • visible electromagnetic Radiation or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation.
  • Such radiation sources are suitable, depending on the spectrum of the emitted radiation, for general and auxiliary lighting, such as home and office illumination or backlighting of displays, such as LCDs (L iquid C rystal D isplays), for the transport and signal lighting, for UV radiation, eg disinfection or photolytics.
  • general and auxiliary lighting such as home and office illumination or backlighting of displays, such as LCDs (L iquid C rystal D isplays), for the transport and signal lighting, for UV radiation, eg disinfection or photolytics.
  • EP 0 363 832 describes a UV high-power lamp with pairs of elongated electrodes connected to both poles of a high-voltage source disclosed.
  • the electrodes are from each other and from the discharge space of the radiator separated by dielectric material.
  • the elongated electrodes with different polarity anodes and Cathodes
  • area-like Discharge configurations with relatively flat discharge tubes let it be realized.
  • WO 94/23442 describes a method for operating an incoherently emitting Radiation source, in particular discharge lamp, by means of dielectric disabled discharge disclosed.
  • the operating procedure sees one Sequence of active power pulses before, the individual active power pulses are separated from each other by dead times.
  • more unipolar Pulse a large number of individual delta-shaped discharges, lined up along the elongated electrodes.
  • the advantage of this pulsed mode of operation is a high efficiency of radiation generation.
  • the invention proposes the separation based on the prior art of those anodes that have two cathodes immediately at equal intervals are adjacent, each in two anodes. In other words an additional anode is arranged between each such pair of cathodes.
  • each anode A i , A i ' is at most one cathode K i or K i + 1 immediately adjacent.
  • each anode pair A i , A i ' is smaller than the distance between the respective anode A i or A i ' and the immediately adjacent cathode K i or K i + 1 .
  • a good value for the mutual distance is the approximate width of the anode strips.
  • the two anodes A i , A i ' are designed as a fork-shaped double anode.
  • the double anode has an elongated first and second region, which are arranged at a predetermined distance from one another. The first and the second area are connected to one another by a third area.
  • FIG. 3a, 3b show a schematic representation of a top view or the cross section along the line BB of a UV / VUV flat radiator 4, i.e. one flat "discharge lamp", which is based on the efficient emission of UV or. VUV radiation is designed.
  • the flat radiator 4 consists of a flat discharge vessel 5 with a rectangular base, four strip-shaped metallic cathodes 6 (-) and three elongated, fork-shaped Double anodes 7 (+).
  • the discharge vessel 5 in turn consists of a rectangular base plate 8 and a trough-like cover 9 (in FIG. 3a not shown), both made of glass.
  • the bottom plate 8 and the lid 9 are gas-tightly connected to one another in the region of their peripheral edges and thus enclose the gas filling of the flat radiator 4.
  • the gas filling exists made of xenon with a filling pressure of 10 kPa.
  • the double anodes 7 exist each from two mutually parallel strips 7a, 7b, which on their one End are merged into a common wide strip 7c.
  • the Cathodes 6 and double anodes 7 are on the inner wall of the base plate 8 applied parallel to each other.
  • the wide end strips 7c Double anodes 7 and the ends of the cathodes 6 are gas-tight from the Discharge vessel 5 led to the outside and serve as connections for a voltage source.
  • the double anodes are 7 within the discharge vessel 5 each completely with one Glass layer 10 covered, the thickness of which is approximately 150 microns.
  • the respective distance d between the cathode 6 and the immediately adjacent strip 7a or 7b of the double anode 7 is approximately 10 mm.
  • the mutual distance g of the two parallel strips 7a, 7b is approximately 3 mm.
  • a variant differs from that in the figures 3a, 3b shown flat radiators only in that not only the anodes, but also the cathodes with a dielectric layer from The inside of the discharge vessel is separated (dielectrically handicapped on both sides Discharge).
  • the inner wall of the discharge vessel is completely coated with a phosphor or phosphor mixture, which converts the UV / VUV radiation generated by the discharge into visible light.
  • a light-reflecting layer of Al 2 O 3 or TiO 2 is applied to the inner wall of the base plate.
  • This variant is a flat fluorescent lamp that is suitable for general lighting or backlighting of displays, e.g. LCD (Liquid Crystal Display), is suitable.
  • LCD Liquid Crystal Display

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Description

Die Erfindung geht aus von einem Flachstrahler gemäß dem Oberbegriff des Anspruchs 1.The invention is based on a flat radiator according to the preamble of Claim 1.

Es handelt sich dabei insbesondere um Flachstrahler wie z.B. in der EP 0 363 832 und in der DE-OS 195 26 211 offenbart. Derartige Strahler weisen mindestens eine vom Entladungsraum des Strahlers durch dielektrisches Material getrennte Elektrode auf. Derartige Elektroden werden im folgenden auch verkürzend als "dielektrische Elektroden" bezeichnet.These are in particular flat radiators such as in the EP 0 363 832 and disclosed in DE-OS 195 26 211. Such radiators have at least one from the discharge space of the radiator by dielectric Material separated electrode. Such electrodes are as follows also abbreviated as "dielectric electrodes".

Unter der Bezeichnung "Flachstrahler" sind hier Strahler mit einer flächigen Geometrie gemeint, die Licht emittieren, d.h. sichtbare elektromagnetische Strahlung, oder auch Ultraviolett(UV)- sowie Vakuumultraviolett(VUV)-Strahlung.Under the name "flat radiators" here are radiators with a flat surface Geometry meant that emit light, i.e. visible electromagnetic Radiation, or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation.

Derartige Strahlungsquellen eignen sich, je nach dem Spektrum der emittierten Strahlung, für die Allgemein- und Hilfsbeleuchtung, z.B. Wohn- und Bürobeleuchtung bzw. Hintergrundbeleuchtung von Anzeigen, beispielsweise LCD's (Liquid Crystal Displays), für die Verkehrs- und Signalbeleuchtung, für die UV-Bestrahlung, z.B. Entkeimung oder Photolytik. Such radiation sources are suitable, depending on the spectrum of the emitted radiation, for general and auxiliary lighting, such as home and office illumination or backlighting of displays, such as LCDs (L iquid C rystal D isplays), for the transport and signal lighting, for UV radiation, eg disinfection or photolytics.

Stand der TechnikState of the art

In der EP 0 363 832 ist ein UV-Hochleistungsstrahler mit paarweise an die beiden Pole einer Hochspannungsquelle angeschlossenen länglichen Elektroden offenbart. Dabei sind die Elektroden, voneinander und vom Entladungsraum des Strahlers durch dielektrisches Material getrennt. Außerdem sind die länglichen Elektroden mit verschiedener Polarität (Anoden und Kathoden) abwechselnd nebeneinander angeordnet, wodurch sich flächenartige Entladungskonfigurationen mit relativ flachen Entladungsgefäßen realisieren lassen.EP 0 363 832 describes a UV high-power lamp with pairs of elongated electrodes connected to both poles of a high-voltage source disclosed. The electrodes are from each other and from the discharge space of the radiator separated by dielectric material. Moreover are the elongated electrodes with different polarity (anodes and Cathodes) arranged alternately next to each other, whereby area-like Discharge configurations with relatively flat discharge tubes let it be realized.

In der WO 94/23442 ist ein Verfahren zum Betreiben einer inkohärent emittierenden Strahlungsquelle, insbesondere Entladungslampe, mittels dielektrisch behinderter Entladung offenbart. Das Betriebsverfahren sieht eine Folge von Wirkleistungspulsen vor, wobei die einzelnen Wirkleistungspulse durch Totzeiten voneinander getrennt sind. Dabei bilden sich im Fall unipolarer Pulse eine Vielzahl einzelner deltaförmiger Entladungen, aufgereiht entlang der länglichen Elektroden. Der Vorteil dieser gepulsten Betriebsweise ist eine hohe Effizienz der Strahlungserzeugung.WO 94/23442 describes a method for operating an incoherently emitting Radiation source, in particular discharge lamp, by means of dielectric disabled discharge disclosed. The operating procedure sees one Sequence of active power pulses before, the individual active power pulses are separated from each other by dead times. In the case of more unipolar Pulse a large number of individual delta-shaped discharges, lined up along the elongated electrodes. The advantage of this pulsed mode of operation is a high efficiency of radiation generation.

Wendet man nun z.B. das Verfahren der WO 94/23442 auf den Flachstrahler der EP 0 363 832 an - wie bereits in der DE-OS 195 26 211 beschrieben -, so findet man, daß sich die Einzelentladungen nur zwischen den Anoden und einer der beiden jeweils unmittelbar benachbarten Kathoden ausbilden. Es kann nicht vorhergesagt werden, von welcher der beiden Nachbarkathoden sich die Entladungen jeweils ausbilden werden. Nicht beobachtet werden Entladungen, die von benachbarten Kathodenstreifen auf ein und dieselbe Anode brennen. Auf den Flachstrahler als Ganzes bezogen resultiert daraus eine unregelmäßige Entladungsstruktur. Ein weiterer Nachteil ist die durch das geschilderte Phänomen eingeschränkte Leistungsdichte. Now apply e.g. the method of WO 94/23442 on the flat radiator EP 0 363 832 - as already described in DE-OS 195 26 211 - so one finds that the individual discharges are only between the anodes and form one of the two immediately adjacent cathodes. It cannot be predicted from which of the two neighboring cathodes the discharges will form in each case. Don't be watched Discharges from neighboring cathode strips to one and the same Burn anode. This results in relation to the flat radiator as a whole an irregular discharge structure. Another disadvantage is that of the phenomenon described restricted power density.

Darstellung der ErfindungPresentation of the invention

Es ist Aufgabe der vorliegenden Erfindung, die genannten Nachteile zu beseitigen und einen Flachstrahler gemäß dem Oberbegriff des Anspruchs 1 mit erhöhter Leistungsdichte und verbesserter Leuchtdichteverteilung bereitzustellen.It is an object of the present invention to eliminate the disadvantages mentioned and a flat radiator according to the preamble of claim 1 to provide with increased power density and improved luminance distribution.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.This object is achieved by the characterizing features of claim 1 solved. Particularly advantageous configurations can be found in the dependent ones Claims.

Ausgehend vom Stand der Technik schlägt die Erfindung die Auftrennung derjenigen Anoden, denen zwei Kathoden unmittelbar mit gleichen Abständen benachbart sind, in jeweils zwei Anoden vor. Mit anderen Worten wird zwischen jedes derartige Kathodenpaar eine zusätzliche Anode angeordnet.The invention proposes the separation based on the prior art of those anodes that have two cathodes immediately at equal intervals are adjacent, each in two anodes. In other words an additional anode is arranged between each such pair of cathodes.

Für die weitere Erläuterung dieses Erfindungsprinzips wird auf die Figuren 1 und 2 Bezug genommen. Schematisch dargestellt sind beispielhaft je ein Ausschnitt eines erfindungsgemäßen und eines konventionellen Flachstrahlers. Der Einfachheit und Übersichtlichkeit wegen sind die Längen der Elektroden ungefähr auf die Ausdehnung einer deltaförmigen Einzelentladung beschränkt. In einer konkreten Ausführung eines Flachstrahlers sind die Elektroden typisch deutlich länger, so daß im Betrieb eine Vielzahl von Einzelentladungen längs der Elektroden brennt. Für die Erläuterung des Erfindungsprinzips spielt die Länge der Elektroden allerdings keine entscheidende Rolle. Die Figuren 1 und 2 stellen quasi die prinzipiellen Verhältnisse pro Längeneinheit der Elektroden dar.For further explanation of this principle of the invention, reference is made to the figures 1 and 2 referenced. Examples are shown schematically a section of a conventional and a conventional flat radiator. For simplicity and clarity, the lengths are Electrodes approximately to the extent of a delta-shaped single discharge limited. Are in a concrete version of a flat radiator the electrodes typically significantly longer, so that a large number of Individual discharges burn along the electrodes. For the explanation of the The principle of the invention does not play a decisive role in the length of the electrodes Role. Figures 1 and 2 represent the basic conditions per unit length of the electrodes.

Erfindungsgemäß ist zwischen mindestens einem, bevorzugt zwischen jedem Kathodenpaar Ki, Ki+1 ein Anodenpaar Ai, Ai' angeordnet, wobei i=1,2,...n und n die Anzahl der Kathoden bezeichnet (in den Figuren 1 und 2 ist beispielhaft n=4 gewählt). Durch diese Maßnahme ist jeder Anode Ai, Ai' höchstens eine Kathode Ki bzw. Ki+1 unmittelbar benachbart.According to the invention, an anode pair A i , A i 'is arranged between at least one, preferably between each pair of cathodes K i , K i + 1 , where i = 1,2, ... n and n denotes the number of cathodes (in FIGS. 1 and 2 is chosen as an example n = 4). With this measure, each anode A i , A i 'is at most one cathode K i or K i + 1 immediately adjacent.

Im Betrieb bilden sich folglich - ausreichende elektrische Eingangsleistung vorausgesetzt - die einzelnen Entladungen i, i' von jeder Anode Ai, Ai' zu der jeweils unmittelbar benachbarten Kathode Ki bzw. Ki+1 aus. Der Nachteil des Standes der Technik, daß nämlich höchsten zu einer von zwei benachbarten Kathoden Einzelentladungen brennen (vgl. Figur 2), wird dadurch vermieden.As a result, the individual discharges i, i 'form from each anode A i , A i ' to the respectively immediately adjacent cathode K i or K i + 1 during operation - provided there is sufficient electrical input power. The disadvantage of the prior art, namely that the highest individual burns to one of two adjacent cathodes (see FIG. 2) is avoided.

Während sich im Beispiel der Figur 1 bei vier Kathoden K1-K4 erfindungsgemäß insgesamt bis zu sechs Einzelentladungen 1,1'-3,3' pro Längeneinheit der Elektroden erzielen lassen - ausreichende elektrische Eingangsleistung vorausgesetzt- sind es bei einer vergleichbaren Anordnung gemäß dem Stand der Technik (s. Figur 2) nur 4 Einzelentladungen 1-4. Außerdem hat die Anordnung nach Figur 2 den bereits erwähnten Nachteil, daß sich nicht vorhersagen läßt zu welcher der Nachbarkathoden Ki,Ki+1 die Entladung i zünden wird. Figur 2 zeigt also nur eine von mehreren möglichen Entladungsstrukturen.While in the example of FIG. 1, four cathodes K1-K4 according to the invention can achieve a total of up to six individual discharges 1,1'-3,3 'per unit length of the electrodes - provided there is sufficient electrical input power - with a comparable arrangement according to the prior art Technology (see Figure 2) only 4 single discharges 1-4. In addition, the arrangement according to FIG. 2 has the disadvantage already mentioned that it cannot be predicted to which of the neighboring cathodes K i , K i + 1 will ignite the discharge i. Figure 2 therefore shows only one of several possible discharge structures.

Der gegenseitige Abstand jedes Anodenpaares Ai, Ai' ist kleiner als der Abstand zwischen jeweiliger Anode Ai oder Ai' und unmittelbar benachbarter Kathode Ki bzw. Ki+1. Dadurch wird die für die Entladung nicht nutzbare Fläche zwischen den Anodenpaaren relativ klein gehalten. Ein günstiger Wert für den gegenseitigen Abstand ist die ungefähre Breite der Anodenstreifen.The mutual distance of each anode pair A i , A i 'is smaller than the distance between the respective anode A i or A i ' and the immediately adjacent cathode K i or K i + 1 . As a result, the area between the anode pairs that cannot be used for the discharge is kept relatively small. A good value for the mutual distance is the approximate width of the anode strips.

In einer Ausführung sind die beiden Anoden Ai, Ai' als eine gabelförmige Doppelanode ausgebildet. Dazu weist die Doppelanode einen jeweils länglichen ersten und zweiten Bereich auf, die in einem vorbestimmten Abstand zueinander angeordnet sind. Der erste und der zweite Bereich sind durch einen dritten Bereich miteinander zu einer Einheit verbunden.In one embodiment, the two anodes A i , A i 'are designed as a fork-shaped double anode. For this purpose, the double anode has an elongated first and second region, which are arranged at a predetermined distance from one another. The first and the second area are connected to one another by a third area.

Beschreibung der ZeichnungenDescription of the drawings

Im folgenden soll die Erfindung anhand eines Ausführungsbeispiels näher erläutert werden. Es zeigen:

Figur 1
eine schematische Darstellung des Prinzips der Erfindung,
Figur 2
eine schematische Darstellung des Prinzips des Standes der Technik,
Figur 3a
eine schematische Darstellung der Draufsicht eines Ausführungsbeispiel eines erfindungsgemäßen Flachstrahlers,
Figur 3b
eine schematische Darstellung des Querschnitts des Flachstrahlers aus Figur 3a.
In the following, the invention will be explained in more detail using an exemplary embodiment. Show it:
Figure 1
1 shows a schematic representation of the principle of the invention,
Figure 2
1 shows a schematic representation of the principle of the prior art,
Figure 3a
2 shows a schematic representation of the top view of an exemplary embodiment of a flat radiator according to the invention,
Figure 3b
a schematic representation of the cross section of the flat radiator from Figure 3a.

Die Figuren 3a, 3b zeigen in schematischer Darstellung eine Draufsicht bzw. den Querschnitt längs der Linie BB eines UV/VUV-Flachstrahlers 4, d.h. einer flachen "Entladungslampe", die auf die effiziente Abstrahlung von UV-bzw. VUV-Strahlung hin konzipiert ist. Der Flachstrahler 4 besteht aus einem flachen Entladungsgefäß 5 mit rechteckiger Grundfläche, vier streifenförmigen metallischen Kathoden 6 (-) sowie drei länglichen, gabelförmigen Doppelanoden 7 (+). Das Entladungsgefäß 5 besteht seinerseits aus einer rechteckigen Bodenplatte 8 und einem wannenartigen Deckel 9 (in Figur 3a nicht dargestellt), beide aus Glas. Die Bodenplatte 8 und der Deckel 9 sind im Bereich ihrer umlaufenden Kanten gasdicht miteinander verbunden und umschließen so die Gasfüllung des Flachstrahlers 4. Die Gasfüllung besteht aus Xenon mit einem Fülldruck von 10 kPa. Die Doppelanoden 7 bestehen jeweils aus zwei zueinander parallelen Streifen 7a, 7b, die an ihrem einen Ende zu einem gemeinsamen breiten Streifen 7c zusammengeführt sind. Die Kathoden 6 und Doppelanoden 7 sind auf der Innenwandung der Bodenplatte 8 parallel zueinander aufgebracht. Die breiten Endstreifen 7c der Doppelanoden 7 sowie die Enden der Kathoden 6 sind gasdicht aus dem Entladungsgefäß 5 nach außen geführt und dienen dort als Anschlüsse für eine Spannungsquelle. Im Unterschied zu den Kathoden 6 sind die Doppelanoden 7 innerhalb des Entladungsgefäßes 5 jeweils vollständig mit einer Glasschicht 10 bedeckt, deren Dicke ca. 150 µm beträgt. Der jeweilige Abstand d zwischen Kathode 6 und dem unmittelbar benachbarten Streifen 7a bzw. 7b der Doppelanode 7 beträgt ca. 10 mm. Der gegenseitige Abstand g der beiden parallelen Streifen 7a, 7b beträgt ca. 3 mm. Im Betrieb bildet sich eine Vielzahl einzelner Entladungen (in den Figuren 3a, 3b nicht dargestellt) aus. Diese Einzelentladungen brennen zwischen jeweiliger Kathode 6 und dem entsprechenden unmittelbar benachbarten Streifen 7a bzw. 7b der zugehörigen Doppelanode 7. Der erzielte Gewinn an einkoppelbarer Leistungsdichte beträgt im Vergleich zu bisher verwendeten Anordnungen ohne Doppelanode (und gleichen geometrischen Abmessungen des Entladungsgefäßes) beinahe 75 %.Figures 3a, 3b show a schematic representation of a top view or the cross section along the line BB of a UV / VUV flat radiator 4, i.e. one flat "discharge lamp", which is based on the efficient emission of UV or. VUV radiation is designed. The flat radiator 4 consists of a flat discharge vessel 5 with a rectangular base, four strip-shaped metallic cathodes 6 (-) and three elongated, fork-shaped Double anodes 7 (+). The discharge vessel 5 in turn consists of a rectangular base plate 8 and a trough-like cover 9 (in FIG. 3a not shown), both made of glass. The bottom plate 8 and the lid 9 are gas-tightly connected to one another in the region of their peripheral edges and thus enclose the gas filling of the flat radiator 4. The gas filling exists made of xenon with a filling pressure of 10 kPa. The double anodes 7 exist each from two mutually parallel strips 7a, 7b, which on their one End are merged into a common wide strip 7c. The Cathodes 6 and double anodes 7 are on the inner wall of the base plate 8 applied parallel to each other. The wide end strips 7c Double anodes 7 and the ends of the cathodes 6 are gas-tight from the Discharge vessel 5 led to the outside and serve as connections for a voltage source. In contrast to the cathodes 6, the double anodes are 7 within the discharge vessel 5 each completely with one Glass layer 10 covered, the thickness of which is approximately 150 microns. The respective distance d between the cathode 6 and the immediately adjacent strip 7a or 7b of the double anode 7 is approximately 10 mm. The mutual distance g of the two parallel strips 7a, 7b is approximately 3 mm. Forms in operation a large number of individual discharges (not shown in FIGS. 3a, 3b) out. These individual discharges burn between the respective cathode 6 and the corresponding immediately adjacent strip 7a or 7b of the associated one Double anode 7. The gain in power density that can be coupled in compared to previously used arrangements without Double anode (and the same geometrical dimensions of the discharge vessel) almost 75%.

Eine Variante (nicht dargestellt) unterscheidet sich von dem in den Figuren 3a, 3b dargestellten Flachstrahler lediglich dadurch, daß nicht nur die Anoden, sondern ebenso die Kathoden mit einer dielektrischen Schicht vom Innern des Entladungsgefäßes getrennt sind (beidseitig dielektrisch behinderte Entladung).A variant (not shown) differs from that in the figures 3a, 3b shown flat radiators only in that not only the anodes, but also the cathodes with a dielectric layer from The inside of the discharge vessel is separated (dielectrically handicapped on both sides Discharge).

In einer weiteren Variante (nicht dargestellt) ist die Innenwandung des Entladungsgefäßes vollständig mit einem Leuchtstoff oder Leuchtstoffgemisch beschichtet, welches die von der Entladung erzeugte UV/VUV-Strahlung in sichtbares Licht konvertiert. Außerdem ist auf der Innenwandung der Bodenplatte je eine lichtreflektierende Schicht aus Al2O3 bzw. TiO2 aufgebracht. In a further variant (not shown), the inner wall of the discharge vessel is completely coated with a phosphor or phosphor mixture, which converts the UV / VUV radiation generated by the discharge into visible light. In addition, a light-reflecting layer of Al 2 O 3 or TiO 2 is applied to the inner wall of the base plate.

Sie dienen der Erhöhung der Leuchtdichte auf der Deckseite des Strahlers. Bei dieser Variante handelt es sich um eine flache Leuchtstofflampe, die für die Allgemeinbeleuchtung oder Hintergrundbeleuchtung von Anzeigen, z.B. LCD (Liquid Crystal Display), geeignet ist.They serve to increase the luminance on the top side of the spotlight. This variant is a flat fluorescent lamp that is suitable for general lighting or backlighting of displays, e.g. LCD (Liquid Crystal Display), is suitable.

Claims (9)

  1. Flat radiator (4) having an at least partially transparent discharge vessel which is closed (5) and filled with a gas filling or open and flowed through by a gas or gas mixture and consists of electrically non-conducting material, and having elongated electrodes (6, 7) arranged on the wall of the discharge vessel (5), cathodes (6) and anodes (7a) being arranged alternately next to one another, and at least the anodes being separated from the interior of the discharge vessel (5) by a dielectric material (10), characterized in that in each case one additional anode (7b) is arranged between neighbouring cathodes (6), that is to say in each case one anode pair (7a, 7b) is arranged between the neighbouring cathodes (6).
  2. Flat radiator according to Claim 1, characterized in that in each case the mutual spacing (g) of the individual anodes of the anode pairs (7a, 7b) is smaller than the spacing (d) between the anode (7a; 7b) and directly neighbouring cathode (6).
  3. Flat radiator according to Claim 1, characterized in that in each case the mutual spacing (g) of the individual anodes of the anode pairs (7a, 7b) is in the region between approximately half the width and double the width of the anodes.
  4. Flat radiator according to Claim 3, characterized in that in each case the mutual spacing (g) of the individual anodes of the anode pairs (7a, 7b) corresponds approximately to the width of the anodes.
  5. Flat radiator according to Claim 1, characterized in that in each case the two anodes arranged between neighbouring cathodes (6) are constructed as a fork-shaped double anode (7) having an in each case elongated first region (7a) and a second region (7b), the first region (7a) and the second region (7b) of the double anode (7) being arranged at a predetermined spacing from one another, and the first region(7a) and the second region (7b) being connected to one another by a third region (7c) to form a unit.
  6. Flat radiator according to Claim 5, characterized in that the length of the third region (7c) is shorter than approximately a tenth of the length of the first region (7a) or of the second region (7b).
  7. Flat radiator according to Claim 5, characterized in that the double anodes (7) are partly guided outwards in a gas-tight fashion from the discharge vessel (5), the third region (7c) of each double anode (7) serving there in each case as a terminal for a power supply.
  8. Flat radiator according to Claim 1, characterized in that the electrodes (6, 7) are mounted on the inner wall of the discharge vessel (5), and in that in each case at least the part of the anode pair (7) extending inside the discharge vessel (5) is completely covered by a dielectric layer (10).
  9. Flat radiator according to Claim 1, characterized in that the inner wall of the discharge vessel is at least partly provided with a fluorescent material layer.
EP98925420A 1997-03-21 1998-03-20 Flat light emitter Expired - Lifetime EP0901687B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19711892 1997-03-21
DE19711892A DE19711892A1 (en) 1997-03-21 1997-03-21 Flat radiator
PCT/DE1998/000829 WO1998043279A1 (en) 1997-03-21 1998-03-20 Flat light emitter

Publications (2)

Publication Number Publication Date
EP0901687A1 EP0901687A1 (en) 1999-03-17
EP0901687B1 true EP0901687B1 (en) 2002-06-26

Family

ID=7824179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98925420A Expired - Lifetime EP0901687B1 (en) 1997-03-21 1998-03-20 Flat light emitter

Country Status (12)

Country Link
US (1) US6222317B1 (en)
EP (1) EP0901687B1 (en)
JP (1) JP3037441B2 (en)
KR (1) KR100281343B1 (en)
CN (1) CN1165958C (en)
CA (1) CA2255758C (en)
DE (2) DE19711892A1 (en)
DK (1) DK0901687T3 (en)
ES (1) ES2179503T3 (en)
HU (1) HU223172B1 (en)
TW (1) TW412772B (en)
WO (1) WO1998043279A1 (en)

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DE102004039902B3 (en) * 2004-08-17 2006-04-06 Berger Gmbh Flat gas discharge lamp, has flat plates forming dielectric layers with dielectrically restricted discharge

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DE19817478B4 (en) * 1998-04-20 2004-03-18 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Flat discharge lamp and process for its manufacture
DE19826809A1 (en) * 1998-06-16 1999-12-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dielectric layer for discharge lamps and associated manufacturing process
DE19844720A1 (en) * 1998-09-29 2000-04-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dimmable discharge lamp for dielectric barrier discharges
DE19919363A1 (en) * 1999-04-28 2000-11-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Discharge lamp with spacer
DE19936865A1 (en) 1999-08-05 2001-02-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Gas discharge lamp and associated manufacturing process
DE19936864A1 (en) * 1999-08-05 2001-02-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Method for inserting a pump stem into a discharge vessel
DE19936863A1 (en) * 1999-08-05 2001-02-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Manufacturing process for a gas discharge lamp
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KR100741898B1 (en) * 2000-12-22 2007-07-24 엘지.필립스 엘시디 주식회사 Flat type fluorescent lamp and method for manufacturing the same
DE10134965A1 (en) * 2001-07-23 2003-02-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Flat discharge lamp has outer side of front plate at least partly provided with opaque coating and inner side of front plate at least partly provided with fluorescent coating
KR100456658B1 (en) * 2002-04-29 2004-11-10 주식회사 엘에스텍 Flat fluorescent lamp
KR100650491B1 (en) * 2004-02-27 2006-11-27 유양산전 주식회사 Flat fluorescent lamp
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Also Published As

Publication number Publication date
US6222317B1 (en) 2001-04-24
CA2255758C (en) 2006-01-24
DE59804564D1 (en) 2002-08-01
EP0901687A1 (en) 1999-03-17
HUP0000626A3 (en) 2003-02-28
HU223172B1 (en) 2004-03-29
CN1220769A (en) 1999-06-23
JPH11514148A (en) 1999-11-30
DK0901687T3 (en) 2002-08-19
HUP0000626A2 (en) 2000-06-28
CN1165958C (en) 2004-09-08
KR100281343B1 (en) 2001-03-02
JP3037441B2 (en) 2000-04-24
DE19711892A1 (en) 1998-09-24
ES2179503T3 (en) 2003-01-16
WO1998043279A1 (en) 1998-10-01
CA2255758A1 (en) 1998-10-01
KR20000015786A (en) 2000-03-15
TW412772B (en) 2000-11-21

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