EP0901687A1 - Flat light emitter - Google Patents

Flat light emitter

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Publication number
EP0901687A1
EP0901687A1 EP98925420A EP98925420A EP0901687A1 EP 0901687 A1 EP0901687 A1 EP 0901687A1 EP 98925420 A EP98925420 A EP 98925420A EP 98925420 A EP98925420 A EP 98925420A EP 0901687 A1 EP0901687 A1 EP 0901687A1
Authority
EP
European Patent Office
Prior art keywords
anodes
region
anode
flat radiator
discharge vessel
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.)
Granted
Application number
EP98925420A
Other languages
German (de)
French (fr)
Other versions
EP0901687B1 (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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0901687A1 publication Critical patent/EP0901687A1/en
Application granted granted Critical
Publication of EP0901687B1 publication Critical patent/EP0901687B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 disclosed in EP 0 363 832 and in DE-OS 195 26 211.
  • Such radiators have at least one electrode separated from the discharge space of the radiator by dielectric material.
  • Such electrodes are also referred to in the following as "dielectric electrodes”.
  • flat radiator here means radiators with a flat geometry that emit light, i.e. visible electromagnetic radiation, or also ultraviolet (UV) and vacuum ultraviolet (VUV) radiation.
  • UV ultraviolet
  • VUV vacuum ultraviolet
  • such radiation sources are suitable for general and auxiliary lighting, for example residential and office lighting or backlighting of displays, for example LCDs (Liquid Crystal Displays), for traffic and signal lighting, for UN radiation, eg disinfection or photolytics.
  • LCDs Liquid Crystal Displays
  • UN radiation eg disinfection or photolytics.
  • EP 0 363 832 discloses a UV high-power radiator with elongated electrodes connected in pairs to the two poles of a high-voltage source.
  • the electrodes are separated from one another and from the discharge space of the radiator by dielectric material.
  • the elongated electrodes with different polarities are arranged alternately next to one another, which enables flat-type discharge configurations with relatively flat discharge vessels to be implemented.
  • WO 94/23442 discloses a method for operating an incoherently emitting radiation source, in particular a discharge lamp, by means of dielectrically impeded discharge.
  • the operating method provides a sequence of active power pulses, the individual active power pulses being separated from one another by dead times.
  • unipolar pulses a large number of individual delta-shaped discharges are formed, lined up along the elongated electrodes.
  • the advantage of this pulsed mode of operation is the high efficiency of the radiation generation.
  • the invention proposes the separation of those anodes which are adjacent to two cathodes directly at the same distance into two anodes each. In other words, an additional anode is arranged between each such pair of cathodes.
  • FIGS. 1 and 2 A section of a conventional flat radiator according to the invention and a conventional flat radiator are shown schematically.
  • the lengths of the electrodes are approximately limited to the extent of a delta-shaped individual discharge.
  • the electrodes are typically significantly longer, so that a plurality of individual discharges burns along the electrodes during operation.
  • the length of the electrodes does not play a decisive role in explaining the principle of the invention.
  • Figures 1 and 2 represent the basic relationships per unit length of the electrodes.
  • each anode A ,, A ' is at most one cathode K or K ⁇ + , immediately adjacent.
  • FIG. 2 shows only one of several possible discharge structures.
  • each anode pair A_, A ' is smaller than the distance between the respective anode A_ or A' and the immediately adjacent cathode K or K 1 + r.
  • a good value for the mutual distance is the approximate width of the anode strips.
  • the two anodes A,, A ' are designed as a fork-shaped double anode.
  • the double anode has an elongated first and second region, which are at a predetermined distance are arranged to each other. The first and the second area are connected to one another by a third area.
  • FIG. 1 shows a schematic representation of the principle of the invention
  • FIG. 2 shows a schematic representation of the principle of the prior art
  • FIG. 3a shows a schematic representation of the top view of an exemplary embodiment of a flat radiator according to the invention
  • Figure 3b is a schematic representation of the cross section of the flat radiator from Figure 3a.
  • FIGS. 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, ie a flat “discharge lamp”, which is designed for the efficient emission of UV or VUV radiation
  • the flat radiator 4 consists of a flat discharge vessel 5 with a rectangular base area, four strip-shaped metallic cathodes 6 (-) and three elongated, fork-shaped double anodes 7 (+)
  • the bottom plate 8 and the cover 9 are connected to one another in a gastight manner in the region of their peripheral edges and thus enclose the gas filling of the flat radiator 4.
  • the gas filling consists of xenon with a filling pressure of 10 kPa
  • Double anodes 7 each consist of 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 applied parallel to one another on the inner wall of the base plate 8.
  • the wide end strips 7c of the double anodes 7 and the ends of the cathodes 6 are passed gas-tight out of the discharge vessel 5 and serve there as connections for a voltage source.
  • the double anodes 7 within the discharge vessel 5 are each completely covered with a glass layer 10, the thickness of which is approximately 150 ⁇ m.
  • the respective distance d between 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 large number of individual discharges (not shown in FIGS. 3a, 3b) form during operation. These individual discharges burn between the respective cathode 6 and the corresponding immediately adjacent strip 7a or 7b of the associated double anode 7.
  • the gain in power density that can be coupled in is almost 75% in comparison to arrangements previously used without a double anode (and the same geometrical dimensions of the discharge vessel). .
  • a variant differs from the flat radiator shown in FIGS. 3a, 3b only in that not only the anodes but also the cathodes are separated from the inside of the discharge vessel by a dielectric layer (discharge which is dielectrically impeded on both sides).
  • 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 a or TiO z is applied to the inner wall of the base plate. 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, eg 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)

Abstract

The invention relates to a flat light emitter (4) which is suitable for dielectrically impeded discharge. The inventive device comprises a discharge vessel (5) made of electrically non-conductive material fitted with strip-like electrodes (6, 7) which are arranged on the wall of said vessel (5). The cathodes (6) and the anodes (7a) are alternatively disposed next to each other. At least the anodes are separated from the inside of the discharge vessel (5) by means of a dielectric material (10). An additional anode (7b) is located between each adjacent cathode (6), i.e. a pair of anodes (7a, 7b) is respectively arranged between said cathodes (6). Such a design enables a homogenous discharge structure in addition to optimal usage of the discharge vessel.

Description

FlachstrahlerFlat radiator
Technisches GebietTechnical field
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 wei- sen 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 disclosed in EP 0 363 832 and in DE-OS 195 26 211. Such radiators have at least one electrode separated from the discharge space of the radiator by dielectric material. Such electrodes are also referred to in the following as "dielectric electrodes".
Unter der Bezeichnung „Flachstrahler" sind hier Strahler mit einer flächigen Geometrie gemeint, die Licht emittieren, d.h. sichtbare elektromagnetische StraWung, oder auch Ultraviolett(UV)- sowie Nakuumultraviolett(VUV)- Strahlung.The term "flat radiator" here means radiators with a flat geometry 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, beispiels- weise LCD's (Liquid Crystal Displays), für die Verkehrs- und Signalbeleuchtung, für die UN-Bestrahlung, z.B. Entkeimung oder Photolytik. Stand der TechnikDepending on the spectrum of the emitted radiation, such radiation sources are suitable for general and auxiliary lighting, for example residential and office lighting or backlighting of displays, for example LCDs (Liquid Crystal Displays), for traffic and signal lighting, for UN radiation, eg disinfection or photolytics. State 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 discloses a UV high-power radiator with elongated electrodes connected in pairs to the two poles of a high-voltage source. The electrodes are separated from one another and from the discharge space of the radiator by dielectric material. In addition, the elongated electrodes with different polarities (anodes and cathodes) are arranged alternately next to one another, which enables flat-type discharge configurations with relatively flat discharge vessels to be implemented.
In der WO 94/23442 ist ein Verfahren zum Betreiben einer inkohärent emit- tierenden 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 discloses a method for operating an incoherently emitting radiation source, in particular a discharge lamp, by means of dielectrically impeded discharge. The operating method provides a sequence of active power pulses, the individual active power pulses being separated from one another by dead times. In the case of unipolar pulses, a large number of individual delta-shaped discharges are formed, lined up along the elongated electrodes. The advantage of this pulsed mode of operation is the high efficiency of the 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 atif 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. Darstellung der ErfindungIf, for example, the method of WO 94/23442 is applied to the flat radiator of EP 0 363 832 - as already described in DE-OS 195 26 211 - it is found that the individual discharges are only between the anodes and one of the two each form immediately adjacent cathodes. It cannot be predicted from which of the two neighboring cathodes the discharges will form. Discharges that burn at least one and the same anode from adjacent cathode strips are not observed. In relation to the flat radiator as a whole, this results in an irregular discharge structure. Another disadvantage is the limited power density due to the phenomenon described. Presentation 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 to provide a flat radiator according to the preamble of claim 1 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. Particularly advantageous configurations can be found in the dependent claims.
Ausgehend vom Stand der Technik schlägt die Erfindung die Auftrennung derjenigen Anoden, denen zwei Kathoden unmittelbar mit gleichen Abstän- den benachbart sind, in jeweils zwei Anoden vor. Mit anderen Worten wird zwischen jedes derartige Kathodenpaar eine zusätzliche Anode angeordnet.On the basis of the prior art, the invention proposes the separation of those anodes which are adjacent to two cathodes directly at the same distance into two anodes each. 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 Flach- Strahlers. 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 FIGS. 1 and 2. A section of a conventional flat radiator according to the invention and a conventional flat radiator are shown schematically. For the sake of simplicity and clarity, the lengths of the electrodes are approximately limited to the extent of a delta-shaped individual discharge. In a specific embodiment of a flat radiator, the electrodes are typically significantly longer, so that a plurality of individual discharges burns along the electrodes during operation. The length of the electrodes does not play a decisive role in explaining the principle of the invention. Figures 1 and 2 represent the basic relationships per unit length of the electrodes.
Erfindungsgemäß ist zwischen mindestens einem, bevorzugt zwischen jedem Kathodenpaar K , Kι+] ein Anodenpaar A , A,' angeordnet, wobei i=l,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 A,, A' höchstens eine Kathode K bzw. Kι+, unmittelbar benachbart.According to the invention, an anode pair A, A, 'is arranged between at least one, preferably between each pair of cathodes K, K ι +] , where i = 1, 2, ... n and n denotes the number of cathodes (in FIGS. 1 and 2 for example, n = 4 is selected). By this measure, each anode A ,, A 'is at most one cathode K or K ι + , immediately adjacent.
Im Betrieb bilden sich folglich - ausreichende elektrische Eingangsleistung vorausgesetzt - die einzelnen Entladungen i, ϊ von jeder Anode A, , A,' zu der jeweils unmittelbar benachbarten Kathode K bzw. K+] aus. Der Nachteil des Standes der Technik, daß nämlich höchsten zu einer von zwei benachbarten Kathoden Einzelentladungen brennen (vgl. Figur 2), wird dadurch vermieden.In operation - provided there is sufficient electrical input power - the individual discharges i, ϊ form from each anode A,, A, 'to the immediately adjacent cathode K or K +] . The disadvantage of the prior art, namely that individual discharges burn to the maximum of one of two adjacent cathodes (cf. FIG. 2), is thereby avoided.
Während sich im Beispiel der Figur 1 bei vier Kathoden K1-K4 erfindungs- gemäß insgesamt bis zu sechs Einzelentladungen l,l'-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 K, ,K1+1 die Entladung i zünden wird. Figur 2 zeigt also nur eine von mehreren möglichen Entla- dungs Strukturen.While in the example of FIG. 1, with four cathodes K1-K4, according to the invention, a total of up to six individual discharges l, l'-3.3 'per unit length of the electrodes can be achieved - provided there is sufficient electrical input power - it is with a comparable arrangement according to State of the art (see FIG. 2) only 4 individual 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 1 , K 1 + 1 will ignite the discharge i. FIG. 2 shows only one of several possible discharge structures.
Der gegenseitige Abstand jedes Anodenpaares A_ , A ' ist kleiner als der Abstand zwischen jeweiliger Anode A_ oder A ' und unmittelbar benachbarter Kathode K bzw. K1+r 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_, A 'is smaller than the distance between the respective anode A_ or A' and the immediately adjacent cathode K or K 1 + r. 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 A, , A' 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,, A 'are designed as a fork-shaped double anode. For this purpose, the double anode has an elongated first and second region, which are at a predetermined distance are arranged to each other. 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:In the following, the invention will be explained in more detail using an exemplary embodiment. Show it:
Figur 1 eine schematische Darstellung des Prinzips der Erfindung,FIG. 1 shows a schematic representation of the principle of the invention,
Figur 2 eine schematische Darstellung des Prinzips des Standes der Technik,FIG. 2 shows a schematic representation of the principle of the prior art,
Figur 3a eine schematische Darstellung der Draufsicht eines Ausführungsbeispiel eines erfindungsgemäßen Flachstrahlers,FIG. 3a shows a schematic representation of the top view of an exemplary embodiment of a flat radiator according to the invention,
Figur 3b eine schematische Darstellung des Querschnitts des Flachstrahlers aus Figur 3a.Figure 3b is 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 streifen- förmigen 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 zu- gehörigen 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 %.FIGS. 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, ie a flat “discharge lamp”, which is designed for the efficient emission of UV or VUV radiation The flat radiator 4 consists of a flat discharge vessel 5 with a rectangular base area, four strip-shaped metallic cathodes 6 (-) and three elongated, fork-shaped double anodes 7 (+) The bottom plate 8 and the cover 9 are connected to one another in a gastight manner in the region of their peripheral edges and thus enclose the gas filling of the flat radiator 4. The gas filling consists of xenon with a filling pressure of 10 kPa Double anodes 7 each consist of 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 applied parallel to one another on the inner wall of the base plate 8. The wide end strips 7c of the double anodes 7 and the ends of the cathodes 6 are passed gas-tight out of the discharge vessel 5 and serve there as connections for a voltage source. In contrast to the cathodes 6, the double anodes 7 within the discharge vessel 5 are each completely covered with a glass layer 10, the thickness of which is approximately 150 μm. The respective distance d between 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 large number of individual discharges (not shown in FIGS. 3a, 3b) form during operation. These individual discharges burn between the respective cathode 6 and the corresponding immediately adjacent strip 7a or 7b of the associated double anode 7. The gain in power density that can be coupled in is almost 75% in comparison to arrangements previously used without a double anode (and the same geometrical dimensions of the discharge vessel). .
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 the flat radiator shown in FIGS. 3a, 3b only in that not only the anodes but also the cathodes are separated from the inside of the discharge vessel by a dielectric layer (discharge which is dielectrically impeded on both sides).
In einer weiteren Variante (nicht dargestellt) ist die Innenwandung des Ent- ladungsgefäßes 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 Al2Oa bzw. TiOz aufgebracht. 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. 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 a or TiO z is applied to the inner wall of the base plate. 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, eg LCD (Liquid Crystal Display).

Claims

Patentansprüche claims
1. Flachstrahler (4) mit einem zumindest teilweise transparenten und mit einer Gasfüllung gefüllten geschlossenen (5) oder von einem Gas oder Gasgemisch durchströmten offenen Entladungsgefäß aus elektrisch nichtleitendem Material und mit auf der Wandung des Entladungsge- fäßes (5) angeordneten länglichen Elektroden (6, 7), wobei Kathoden (6) und Anoden (7a) wechselweise nebeneinander angeordnet sind und wobei zumindest die Anoden durch ein dielektrisches Material (10) vom Inneren des Entladungsgefäßes (5) getrennt sind, dadurch gekennzeichnet, daß zwischen benachbarten Kathoden (6) jeweils eine zusätzliche Anode (7b) angeordnet ist, d.h. daß zwischen den Nachbarkathoden (6) jeweils ein Anodenpaar (7a, 7b) angeordnet ist.1. Flat radiator (4) with an at least partially transparent, closed (5) or filled with a gas filling open discharge vessel made of electrically non-conductive material and with elongated electrodes (6) arranged on the wall of the discharge vessel (5) , 7), cathodes (6) and anodes (7a) being arranged alternately next to one another and at least the anodes being separated from the inside of the discharge vessel (5) by a dielectric material (10), characterized in that between adjacent cathodes (6) in each case an additional anode (7b) is arranged, ie that an anode pair (7a, 7b) is arranged between the adjacent cathodes (6).
2. Flachstrahler nach Anspruch 1, dadurch gekennzeichnet, daß jeweils der gegenseitige Abstand (g) der einzelnen Anoden der Anodenpaare (7a, 7b) kleiner ist als der Abstand (d) zwischen Anode (7a; 7b) und unmittelbar benachbarter Kathode (6).2. Flat radiator according to claim 1, characterized in that in each case the mutual distance (g) of the individual anodes of the anode pairs (7a, 7b) is smaller than the distance (d) between the anode (7a; 7b) and the immediately adjacent cathode (6) .
3. Flachstrahler nach Anspruch 1, dadurch gekennzeichnet, daß jeweils der gegenseitige Abstand (g) der einzelnen Anoden der Anodenpaare (7a, 7b) im Bereich zwischen ungefähr der halben Breite und der doppelten Breite der Anoden liegt.3. Flat radiator according to claim 1, characterized in that in each case the mutual distance (g) of the individual anodes of the anode pairs (7a, 7b) is in the range between approximately half the width and twice the width of the anodes.
4. Flachstrahler nach Anspruch 3, dadurch gekennzeichnet, daß jeweils der gegenseitige Abstand (g) der einzelnen Anoden der Anodenpaare (7a, 7b) ungefähr der Breite der Anoden entspricht.4. Flat radiator according to claim 3, characterized in that the mutual distance (g) of the individual anodes of the anode pairs (7a, 7b) corresponds approximately to the width of the anodes.
5. Flachstrahler nach Anspruch 1, dadurch gekennzeichnet, daß jeweils die beiden zwischen Nachbarkathoden (6) angeordneten Anoden als gabelförmige Doppelanode (7) mit einem jeweils länglichen ersten Bereich (7a) und zweiten Bereich (7b) ausgebildet sind, wobei der erste Bereich (7a) und der zweite Bereich (7b) der Doppelanode (7) in einem vorbestimmten Abstand zueinander angeordnet sind und wobei der erste Bereich (7a) und der zweite Bereich (7b) durch einen dritten Bereich (7c) miteinander zu einer Einheit verbunden sind.5. Flat radiator according to claim 1, characterized in that in each case the two anodes arranged between adjacent cathodes (6) are designed as fork-shaped double anodes (7), each with an elongated first region (7a) and second region (7b), the first The region (7a) and the second region (7b) of the double anode (7) are arranged at a predetermined distance from one another and the first region (7a) and the second region (7b) are connected to one another by a third region (7c) are.
6. Flachstrahler nach Anspruch 5, dadurch gekennzeichnet, daß die Länge des dritten Bereichs (7c) kürzer als ca. ein zehntel der Länge des ersten Bereichs (7a) bzw. des zweiten Bereichs (7b) ist.6. Flat radiator according to claim 5, characterized in that the length of the third region (7c) is shorter than approximately one tenth of the length of the first region (7a) or the second region (7b).
7. Flachstrahler nach Anspruch 5, dadurch gekennzeichnet, daß die Doppelanoden (7) teilweise aus dem Entladungsgefäß (5) gasdicht nach au- ßen geführt sind, wobei dort jeweils der dritte Bereich (7c) jeder Doppelanode (7) als Anschluß für eine Spannungsversorgung dient.7. Flat radiator according to claim 5, characterized in that the double anodes (7) are partially guided gas-tight to the outside from the discharge vessel (5), the third area (7c) of each double anode (7) as a connection for a voltage supply serves.
8. Flachstrahler nach Anspruch 1, dadurch gekennzeichnet, daß die Elektroden (6, 7) auf der Innenwandung des Entladungsgefäßes (5) aufgebracht sind und daß jeweils mindestens der sich innerhalb des Entla- dungsgefäßes (5) erstreckende Teil der Anodenpaare (7) vollständig mit einer dielektrischen Schicht (10) bedeckt ist.8. Flat radiator according to claim 1, characterized in that the electrodes (6, 7) are applied to the inner wall of the discharge vessel (5) and that in each case at least that part of the anode pairs (7) which extends within the discharge vessel (5) is complete is covered with a dielectric layer (10).
9. Flachstrahler nach Anspruch 1, dadurch gekennzeichnet, daß die Innenwandung des Entladungsgefäßes mindestens teilweise mit einer Leuchtstoffschicht versehen ist. 9. Flat radiator according to claim 1, characterized in that the inner wall of the discharge vessel is at least partially provided with a phosphor 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

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

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US (1) US6222317B1 (en)
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JP (1) JP3037441B2 (en)
KR (1) KR100281343B1 (en)
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CA (1) CA2255758C (en)
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KR100281343B1 (en) 2001-03-02
JP3037441B2 (en) 2000-04-24
WO1998043279A1 (en) 1998-10-01
DE59804564D1 (en) 2002-08-01
HU223172B1 (en) 2004-03-29
TW412772B (en) 2000-11-21
CN1220769A (en) 1999-06-23
CA2255758A1 (en) 1998-10-01
DE19711892A1 (en) 1998-09-24
HUP0000626A2 (en) 2000-06-28
ES2179503T3 (en) 2003-01-16
EP0901687B1 (en) 2002-06-26
KR20000015786A (en) 2000-03-15
CA2255758C (en) 2006-01-24
CN1165958C (en) 2004-09-08
JPH11514148A (en) 1999-11-30
HUP0000626A3 (en) 2003-02-28
DK0901687T3 (en) 2002-08-19
US6222317B1 (en) 2001-04-24

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