EP0990262B1 - Lampe a decharge a electrodes protegees par un dielectrique - Google Patents

Lampe a decharge a electrodes protegees par un dielectrique Download PDF

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Publication number
EP0990262B1
EP0990262B1 EP99911602A EP99911602A EP0990262B1 EP 0990262 B1 EP0990262 B1 EP 0990262B1 EP 99911602 A EP99911602 A EP 99911602A EP 99911602 A EP99911602 A EP 99911602A EP 0990262 B1 EP0990262 B1 EP 0990262B1
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EP
European Patent Office
Prior art keywords
electrodes
discharge
lamp according
discharge vessel
wall
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
Application number
EP99911602A
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German (de)
English (en)
Other versions
EP0990262A1 (fr
Inventor
Frank Vollkommer
Lothar Hitzschke
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
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 Hitzschke Lothar Dr, Vollkommer Frank Dr, Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Hitzschke Lothar Dr
Publication of EP0990262A1 publication Critical patent/EP0990262A1/fr
Application granted granted Critical
Publication of EP0990262B1 publication Critical patent/EP0990262B1/fr
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
    • 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
    • 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
    • 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

Definitions

  • the invention is based on a discharge lamp according to the preamble of claim 1.
  • the invention also relates to a lighting system according to the preamble of claim 14 with this discharge lamp.
  • the outer wall serves under other than dielectric layer, which during the operation of the lamp separates the electrodes from the discharge. This type of discharge is called hence double-sided dielectric discharge.
  • the spectrum of the electromagnetic emitted by this lamp Radiation can affect both the visible area and the UV (ultraviolet) / VUV (vacuum ultraviolet) range and the IR (infrared) range include.
  • a phosphor layer can also be used for conversion be made invisible in visible radiation.
  • tubular Discharge vessel sealed on both sides.
  • the cross section of the discharge vessel is preferably circular. However, they are only approximate circular cross-sections, for example regular polygons, e.g. Secksecke etc.
  • tubular is not just tubular here Discharge vessels limited but also includes curved, for example angled, tubular discharge tubes. Because the discharge direction runs essentially perpendicular to the lamp longitudinal axis there is also no general limit on the length of the lamp.
  • OA O ffice A utomation
  • the signal light for example as brake and turn signal light in automobiles
  • auxiliary lighting including interior lighting of motor vehicles
  • Backlighting of displays for example liquid crystal displays, used as so-called "edge type backlights”.
  • a noble gas discharge lamp is already known from the document US Pat. No. 5,117,160 OA devices known.
  • On the outer surface of the wall of a tubular discharge vessel are two strip-shaped electrodes along the longitudinal axis of the lamp arranged.
  • the lamp is preferred with AC voltage Frequency operated between 20 kHz and 100 kHz. Operational the 147 nm xenon line is excited. The one with the operating mode used achievable radiation efficiency and consequently the resulting Luminance is relatively low.
  • EP-A-0 766 286 there is a rare gas discharge lamp with a tubular one Discharge vessel disclosed.
  • the discharge vessel is on the outer wall with three or more strip-like electrodes parallel to the longitudinal axis Mistake. With the exception of one intended for light emission strip-like areas parallel to the longitudinal axis cover the strip-like areas Electrodes cover almost the entire remaining surface area of the discharge tube.
  • the strip-like electrodes are relatively narrow from each other Separate areas that are filled with insulating material. Thereby are supposed to cause sliding discharges on the outer wall between the individual strip-like Electrodes are prevented.
  • the term "pair of electrodes” is first introduced. Below that are two lines to each other understand parallel electrodes with different polarities during operation, between which a “discharge level” burns during operation.
  • the discharge plane is a planar discharge structure that consists of a large number of individual discharges.
  • the discharge lamp has three or more line-like electrodes which are arranged on the outer wall of the tubular discharge vessel of the lamp and parallel to the longitudinal axis of the tubular discharge vessel in such a way that the following relationship is fulfilled: s a ⁇ 0.1, where s defines the maximum distance that the imaginary connecting line of an electrode pair has to the next adjacent wall of the discharge vessel and where a defines the mutual distance of the electrodes of this electrode pair (measured in the center from the electrodes).
  • FIG. 6 shows the maximum distance s that the imaginary connecting line 20 of a pair of electrodes 3, 4 or 3, 5 has to the next-adjacent wall of the discharge vessel 2, using the example of a discharge lamp 1 with three electrodes 3 - 3. 5 shows schematically.
  • At least two discharge levels are generated, which are: between corresponding pairs of electrodes and along the longitudinal axis extend the discharge vessel.
  • this level are a variety of Single discharges lined up alongside each other along the electrodes, which are in the Borderline transition into a kind of curtain-like discharge form.
  • the discharge planes can also have a common electrode, for example in the case of three electrodes in which the two electrodes same polarity, only a common counter electrode with an opposite one Have polarity. In other words, two are shared in this case Electrode pairs a common electrode. This is preferred for unipolar ones Voltage pulses are the cathode and the other two electrodes switched as anodes. To increase the luminance of the lamp can increase further discharge levels within the discharge vessel be generated.
  • these are preferably arranged, viewed in cross section, at least approximately at the corner points of an imaginary isosceles or equilateral triangle.
  • the latter case has the advantage that the lamp can be manufactured relatively easily, since the lamp only has to be rotated through 120 ° in order to apply the second and third electrodes.
  • the quotient s / a always has the value 1 / (2 3 ) ⁇ 0.29, regardless of the lamp diameter, and consequently fulfills the relationship mentioned above.
  • the arrangement in the form of an isosceles triangle has the advantage that larger striking distances (and therefore higher electrical power coupling, see below) can be achieved for the two discharge levels, provided that the angle formed by the two discharge levels is chosen to be less than 120 °.
  • two independent discharge levels can be created or realize three discharge levels with a common electrode, depending on whether the four electrodes as unipolar excitation two cathodes and two anodes or as one cathode and three anodes (or an anode and three cathodes) are connected.
  • the electrode arrangement according to the invention enables relatively high filling pressures of the active discharge gas, typically approximately 20 kPa (150 torr) and more, without any discharge instabilities, for example discharge arcs, which are detrimental to efficient useful radiation generation.
  • a noble gas, in particular xenon, or a noble gas mixture, for example xenon and krypton, is suitable as the active gas filling within the discharge vessel.
  • a buffer gas can be added to the active discharge gas, which is not directly involved in the generation of radiation, for example neon.
  • Excimers for example Xe 2 * excimers, are produced in the discharge as particles which emit electromagnetic radiation.
  • Each outer wall electrode is as an electrically conductive, line-like Stripes formed - but which also have a substructure can - and parallel to the longitudinal axis of the tubular discharge vessel oriented.
  • the width of a strip is typically approx. 1 mm and less. In this way, shadowing by three or more electrodes kept small even with small diameter lamps. To the others have shown that this results in higher efficiency in the production of useful radiation is achieved.
  • the inner wall can have a phosphor layer.
  • one or more reflection layers for visible light for example made of Al 2 O 3 and / or TiO 2 , can be applied below the phosphor layer. This may prevent some of the light emitted by the phosphor layer from being transmitted through the vessel wall. Rather, the light is essentially directed onto the aperture by reflection or multiple reflection and consequently the luminance is increased there.
  • the phosphor layer itself can also be additionally used as a reflection layer by applying the phosphor layer with a sufficient thickness. In both cases, only a strip-shaped aperture remains uncoated or is only coated with a relatively thin phosphor layer. As a result, the aperture has an increased luminance during operation.
  • the lamp may be advantageous to use the lamp with transparent electrical insulation, e.g. with a see-through Plastic shrink tubing, protective varnish or similar to encase.
  • FIG. 1 shows a cross section of an aperture fluorescent lamp 1 for OA applications in a highly schematic representation.
  • the lamp 1 consists essentially of a tubular Discharge vessel 2 with a circular cross section and a first, a second and a third strip-shaped electrode 3-5.
  • the inner wall of the discharge vessel 2 points with the exception of a rectangular one Aperture 6 has a reflection layer 7.
  • On this reflective layer 7 as well the inner wall in the area of the aperture 6 is a phosphor layer 8 applied.
  • the discharge vessel 2 is dome-shaped at both ends sealed gastight (not shown). Inside the discharge vessel 2 Xenon is at a fill pressure of approximately 21.33 kPa (160 torr).
  • the three electrodes 3-5 are designed as metal foil strips.
  • the first The electrode is provided as a cathode 3 and the other two as anodes 4, 5 (unipolar operation).
  • the electrodes 3-5 are viewed in cross section at the corner points of an imaginary isosceles triangle on the outer wall of the discharge vessel 2 arranged. Consequently, in the pulsed operation according to US Pat. No. 5,604,410 two levels with dielectric disabled single discharges from (not shown).
  • a first level of discharge extends within the discharge vessel 2 between the Cathode strip 3 and the first anode strip 4.
  • the other level of discharge extends accordingly between the cathode strip 3 and the second anode strip 5.
  • the respective width of the anode strips 4, 5 is 0.9 mm.
  • the width of the cathode strip 3 is 0.8 mm.
  • the outer diameter of the tubular discharge vessel 2 made of glass is approximately 9 mm with a wall thickness of approximately 0.5 mm.
  • the width and length of the aperture 6 are approximately 6.5 mm and 255 mm, respectively.
  • the lamp in Figure 2 - similar features are given the same reference numerals as designated in Figure 1 - has four outer wall electrodes 9-12 on. Of these, two are electrodes as cathodes 9, 10 and the rest two electrodes are provided as anodes 11, 12.
  • the two pairs of electrodes 9, 12 and 10, 11 are arranged on the outer wall such that the both discharge levels burning during operation between a pair of electrodes (not shown) are oriented parallel to each other. adversely is the slightly shorter stroke distance compared to FIG. Indeed this electrically symmetrical arrangement is well suited for a bipolar Business.
  • the aperture 6 is arranged centrally between a pair of electrodes such that the surface normal over large areas of the aperture 6 quasi is oriented perpendicular to the two discharge planes.
  • the lamp from FIG. 2 is intended for automotive lighting and depending on the phosphor used, for example as a brake light or Flashing light.
  • the lamp in Figure 3 differs from that in Figure 1 by another Electrode 13, which is arranged between the two anodes and also is provided as an anode.
  • a total of three discharge levels are thus formed, in each case between the first cathode 3 and one of the three anodes 4, 13 and 5.
  • the inner wall of the discharge vessel 2 has a phosphor layer 6 on. There is no reflection layer or aperture here.
  • FIG. 4 shows a lighting system for OA devices.
  • the aperture fluorescent lamp 1 from FIG. 1 additionally points at its second end a base 14.
  • the base 14 consists essentially of a Socket pot 15 and two connecting pins 16a, 16b.
  • the base pot 15 serves primarily the inclusion of the lamp 1.
  • the outer wall cathode 3 and the anodes 4 and 5 from Discharge vessel 2 covered and therefore not visible
  • the connector pins 16a, 16b are in turn connected to the two via electrical lines 17a, 17b Poles 18a and 18b of a pulse voltage source 19 connected.
  • the pulse voltage source 19 supplies a sequence of unipolar voltage pulses with pulse heights of approximately 3 kV and with a repetition frequency of 80 kHz.
  • the pulse duration is approx. 1.1 ⁇ s each.
  • a luminance of approx. 45000 cd / m 2 is achieved with a power consumption of 10 W.
  • FIG. 5 shows the luminance L [cd / m 2 ] measured by the aperture in arbitrary units as a function of the time-averaged electrical power P in W.
  • Curve 20 relates to an illumination system according to FIG. 4 with the operating parameters specified there and three outer wall electrodes.
  • Curve 21 relates to a comparable lamp with only two electrodes. From the figure it can be seen qualitatively that the lamp according to the invention with three electrodes achieves a significantly higher luminance than the conventional lamp with electrical powers of more than 10 W. In addition, curve 20 rises even with an electrical power of 20 W, whereas curve 21 already flattens slightly, ie shows a saturation behavior.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (15)

  1. Lampe (1) à décharge, ayant une enceinte (2) de décharge tubulaire, fermée, au moins transparente en partie et emplie d'une atmosphère gazeuse et un certain nombre d'électrodes (3 à 5, 9 à 12, 13) disposées parallèlement à l'axe longitudinal de l'enceinte (2) de décharge tubulaire et sur la paroi extérieure de cette enceinte (2) de décharge,
    caractérisée en ce que
    les électrodes (3 à 5, 9 à 12) sont de type linéaire.
    le nombre des électrodes (3 à 5, 9 à 12) est de trois ou de plus de trois et la relation suivante est satisfaite : sa ≥ 0,1
       s étant la distance maximum entre la droite (20) de liaison imaginaire d'une paire (3, 4 ; 3, 5) d'électrodes et la paroi la plus voisine de l'enceinte (2) de décharge et a définissant la distance mutuelle entre les électrodes de cette paire d'électrodes.
  2. Lampe à décharge suivant la revendication 1, dans laquelle s / a ≥ 0,2 et notamment de préférence > 0,25.
  3. Lampe à décharge suivant la revendication 1 ou 2, dans laquelle le nombre des électrodes ayant une polarité (3) est différente du nombre des électrodes de l'autre polarité (4, 5, 13).
  4. Lampe à décharge suivant la revendication 3, dans laquelle le nombre des électrodes est exactement de trois.
  5. Lampe à décharge suivant la revendication 4, dans laquelle, considéré en section transversale, les électrodes ( 3 à 5) sont disposées au moins à peu près aux sommets d'un triangle équilatéral imaginaire.
  6. Lampe à décharge suivant la revendication 4, dans laquelle, considéré en section transversale, les électrodes sont placées au moins à peu près aux sommets d'un triangle isocèle imaginaire.
  7. Lampe fluorescente suivant l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'atmosphère gazeuse est constituée d'un gaz rare ou d'un mélange de gaz rares.
  8. Lampe fluorescente suivant la revendication 7, caractérisée en ce que la pression de l'atmosphère gazeuse est supérieure à 13 kPa.
  9. Lampe fluorescente suivant la revendication 7 ou 8, caractérisée en ce que l'atmosphère gazeuse contient du xénon.
  10. Lampe à décharge suivant l'une ou plusieurs des revendications précédentes, dans laquelle la largeur des électrodes est de 1 mm ou inférieure à 1 mm.
  11. Lampe à décharge suivant l'une ou plusieurs des revendications précédentes, dans laquelle l'enceinte (2) de décharge a sur sa paroi au moins en partie une couche d'une substance luminescente ou d'un mélange (8) de substances luminescentes et, le cas échéant, en plus une couche (7) réfléchissante.
  12. Lampe fluorescente suivant la revendication 11, dans laquelle la paroi de l'enceinte (2) de décharge a une ouverture (6) qui est prise au moins hors de la couche (7) réfléchissante.
  13. Lampe fluorescente suivant l'une ou plusieurs des revendications précédentes dans laquelle l'enceinte (2) de décharge tubulaire a une section transversale circulaire d'un diamètre intérieur de moins de 20 µm, notamment de moins de 15 µm.
  14. Système d'éclairage, ayant une lampe (1) fluorescente suivant l'une des revendications 1 à 13 et une source (19) de tension électrique par impulsion qui est propre à fournir en fonctionnement des impulsions de puissance active séparées les unes des autres par des intervalles, caractérisé en ce que la lampe (1) fluorescente a des caractéristiques d'une ou plusieurs des revendications 1 à 13, la source (19) de tension par impulsion étant reliée d'une manière conductrice d'électricité avec les deux entrées (17a, 17b) extérieures de courant de la lampe (1) fluorescente.
  15. Système d'éclairage suivant la revendication 14, caractérisé par des paramètres de fonctionnement suivants :
    fréquence de répétition des impulsions de puissance active supérieure ou égale à 20 kHz.
    durée des impulsions de puissance active inférieure à 2 µs.
EP99911602A 1998-04-20 1999-02-18 Lampe a decharge a electrodes protegees par un dielectrique Expired - Lifetime EP0990262B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19817475A DE19817475B4 (de) 1998-04-20 1998-04-20 Entladungslampe mit dielektrisch behinderten Elektroden sowie Beleuchtungssystem mit einer solchen Entladungslampe
DE19817475 1998-04-20
PCT/DE1999/000450 WO1999054917A1 (fr) 1998-04-20 1999-02-18 Lampe a decharge a electrodes protegees par un dielectrique

Publications (2)

Publication Number Publication Date
EP0990262A1 EP0990262A1 (fr) 2000-04-05
EP0990262B1 true EP0990262B1 (fr) 2004-04-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99911602A Expired - Lifetime EP0990262B1 (fr) 1998-04-20 1999-02-18 Lampe a decharge a electrodes protegees par un dielectrique

Country Status (10)

Country Link
US (1) US6310442B1 (fr)
EP (1) EP0990262B1 (fr)
JP (1) JP2002505801A (fr)
KR (1) KR100602395B1 (fr)
AT (1) ATE264547T1 (fr)
CA (1) CA2294850C (fr)
DE (2) DE19817475B4 (fr)
HU (1) HU224080B1 (fr)
TW (1) TW434641B (fr)
WO (1) WO1999054917A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6541924B1 (en) * 2000-04-14 2003-04-01 Macquarie Research Ltd. Methods and systems for providing emission of incoherent radiation and uses therefor
DE10133326A1 (de) * 2001-07-10 2003-01-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dielektrische Barrieren-Entladungslampe mit Zündhilfe
US6946794B2 (en) * 2001-11-22 2005-09-20 Matsushita Electric Industrial Co., Ltd. Light source device and image reader
DE102004047373A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Beleuchtungssystem mit dielektrisch behinderter Entladungslampe und zugehörigem Vorschaltgerät
DE102004047375A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dielektrische behinderte Entladungslampe mit Manschette
DE102004047376A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dielektrisch behinderte Entladungslampe mit steckbaren Elektroden
US7303307B2 (en) * 2004-10-06 2007-12-04 Osram Sylvania Inc. Electrodeless lamp with incorporated reflector

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792732A (en) * 1987-06-12 1988-12-20 United States Of America As Represented By The Secretary Of The Air Force Radio frequency plasma generator
DE4010809A1 (de) * 1989-04-11 1990-10-18 Asea Brown Boveri Hochleistungsstrahler
US5117160C1 (en) * 1989-06-23 2001-07-31 Nec Corp Rare gas discharge lamp
JP3532578B2 (ja) * 1991-05-31 2004-05-31 三菱電機株式会社 放電ランプおよびこれを用いる画像表示装置
JPH05242870A (ja) * 1992-02-28 1993-09-21 Mitsubishi Electric Corp 放電ランプ
DE4311197A1 (de) * 1993-04-05 1994-10-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle
WO1994027312A1 (fr) * 1993-05-12 1994-11-24 Rae Systems, Inc. Lampe a decharge
JP3149780B2 (ja) * 1995-03-31 2001-03-26 ウシオ電機株式会社 外部電極式蛍光放電管
KR100405264B1 (ko) * 1996-04-30 2004-03-24 우시오덴키 가부시키가이샤 외부전극형형광램프및조사유닛

Also Published As

Publication number Publication date
DE19817475A1 (de) 1999-10-28
CA2294850C (fr) 2007-09-25
HUP0002504A2 (hu) 2000-11-28
WO1999054917A1 (fr) 1999-10-28
DE59909153D1 (de) 2004-05-19
HU224080B1 (hu) 2005-05-30
JP2002505801A (ja) 2002-02-19
KR20010014032A (ko) 2001-02-26
TW434641B (en) 2001-05-16
DE19817475B4 (de) 2004-04-15
KR100602395B1 (ko) 2006-07-20
HUP0002504A3 (en) 2001-12-28
EP0990262A1 (fr) 2000-04-05
US6310442B1 (en) 2001-10-30
CA2294850A1 (fr) 1999-10-28
ATE264547T1 (de) 2004-04-15

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