EP1417700A2 - Lampe d charge tubulaire auxiliaire d'allumage - Google Patents

Lampe d charge tubulaire auxiliaire d'allumage

Info

Publication number
EP1417700A2
EP1417700A2 EP02753000A EP02753000A EP1417700A2 EP 1417700 A2 EP1417700 A2 EP 1417700A2 EP 02753000 A EP02753000 A EP 02753000A EP 02753000 A EP02753000 A EP 02753000A EP 1417700 A2 EP1417700 A2 EP 1417700A2
Authority
EP
European Patent Office
Prior art keywords
coating
wall
discharge lamp
lamp according
discharge
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.)
Withdrawn
Application number
EP02753000A
Other languages
German (de)
English (en)
Inventor
Gerhard DÖLL
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.)
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 EP1417700A2 publication Critical patent/EP1417700A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/025—Associated optical elements

Definitions

  • the invention relates to a dielectric barrier discharge lamp with a tubular discharge vessel and a phosphor layer.
  • Dielectric barrier discharge lamps are sources of electromagnetic radiation based on dielectric barrier gas discharges.
  • the discharge vessel is usually filled with an inert gas, for example xenon, or a gas mixture.
  • excimers are formed during the gas discharge, which is preferably operated by means of a pulsed operating method described in US Pat. No. 5,604,410.
  • Excimers are excited molecules, such as Xe2 *, which emit electromagnetic radiation when they return to the generally unbound basic state. In the case of Xe 2 *, the maximum of the molecular band radiation is approximately 172 nm (NUN radiation).
  • the phosphor layer is used to convert the invisible NUN radiation into visible (N ⁇ S) radiation (light).
  • OA Office Automation
  • signal lighting e.g. as brake and direction indicator lights in automobiles
  • auxiliary lighting e.g. interior lighting for automobiles
  • backlighting of Displays for example liquid crystal displays
  • the inner wall of the discharge vessel is usually provided with a NUN / NIS reflection layer, for example A1 2 Ü3 and / or Ti0 2 .
  • An aperture extending along the longitudinal axis of the lamp remains free of reflection layers, since the NUN / NIS reflection layer is also impermeable to the light emitted by the phosphor layer.
  • the actual phosphor layer is located on the NUN / VTS reflection layer, and the aperture can optionally also be coated with phosphor or free of phosphor. In any case, due to the NUV / NIS reflection layer, the desired high luminance can be generated within the aperture without the reflection layer.
  • a dielectric barrier discharge lamp necessarily requires at least one so-called dielectric barrier electrode.
  • a dielectric barrier electrode is separated from the inside of the discharge vessel by means of a dielectric barrier.
  • This dielectric barrier can be designed, for example, as a dielectric layer covering the electrode, or it is formed by the discharge vessel of the lamp itself, namely when the electrode is arranged on the outer wall of the discharge vessel.
  • a dielectric barrier discharge lamp of the type mentioned at the outset is disclosed in US Pat. No. 6,097,155.
  • the lamp has a tubular discharge vessel, on the inner and / or outer wall of which at least two elongate, conductor-like electrodes are arranged parallel to the longitudinal axis of the discharge vessel.
  • the long ignition delay after the voltage is applied to the electrodes of the lamp when the lamp is in the dark is disadvantageous. After a long period of time in the dark, it may even happen that the lamp can only be ignited with a voltage that is significantly higher than in normal operation.
  • DE-A 4203 594 discloses a lamp with a discharge tube which has a transparent tube filled with a discharge gas and two electrodes which produce a spatial discharge in the tube, the two electrodes running essentially parallel to the length of the tube and the one electrode is centrally located axially inside the tube and the other outside the tube.
  • the surface of the inner electrode and / or the inner side of the tube is coated with a coating material made of a metal with a high secondary emission ratio and / or a dielectric.
  • Rare earth oxides, aluminum oxide (A1 2 0 3 ), silicon oxide (Si0 2 ) or magnesium oxide (MgO) is used as the coating material.
  • the more preferred coating material is magnesium oxide, which can also act as a protective layer.
  • the object of the present invention is to provide a dielectric barrier discharge lamp with a tubular discharge vessel and a phosphor layer according to the preamble of claim 1, which has an improved ignition behavior.
  • the dielectric barrier discharge lamp according to the invention has a tubular discharge vessel and a phosphor layer on at least part of the inner wall of the discharge vessel.
  • elongated, dielectrically impeded electrodes oriented parallel to the longitudinal axis of the discharge vessel are arranged on the vessel wall.
  • At least one end of the tubular discharge vessel is provided on a partial region of the inner wall with a coating which also covers one end of at least one elongate electrode, the material of this coating having a high secondary electron emission coefficient (hereinafter referred to as SEE coating for brevity).
  • the SEE coating is in direct contact with the filling gas enclosed by the discharge vessel.
  • the SEE coating is always the last of possibly several functional layers on the inner wall of the discharge vessel, ie each additional layer, for example fluorescent and / or NUN / NIS reflection layer is arranged between the SEE coating and the inner wall of the discharge vessel. In this way it is ensured that the SEE coating is hit by free electrons accelerated in the electrical field of the electrodes and secondary electrons are thereby triggered.
  • the advantage of this solution is that a large part of the phosphor layer also applied to the inner wall of the discharge vessel is uncoated, i.e. is actually also effective, since the SEE coating is limited to one or both ends of the tubular discharge vessel.
  • a slight shade at the lamp ends is less of a problem than in the middle of the lamp.
  • the SEE coating is therefore also limited to the area at the end of at least one elongated electrode.
  • the portion of the inner wall provided with the coating is preferably less than 25%, better less than 10% of the total area of the inner wall along the longitudinal axis of the tubular discharge vessel, i.e. the lateral surface.
  • the SEE coating preferably overlaps one end of the elongated electrode, the overlap being in the range of greater than 0 and less than or equal to 10 mm, preferably in the range of greater than 2 and less than or equal to 6 mm. Since it is possible to operate lamps of different lengths due to the transverse discharge configuration, reference should also be made here to the relative overlap, which is typically in the range from greater than 0 and less than or equal to 20%, preferably in the range from greater than 0 and less than or equal to 10 % of the total length of the lamp. In the case of electrodes (inner wall electrodes) arranged on the inner wall of the discharge vessel, as disclosed in the already mentioned US Pat. No.
  • the overlap initially relates to the end of the electrode opposite the power supply.
  • the SEE coating can of course also cover the end of the electrode on the power supply side.
  • the inner wall electrode, the electrical feedthrough and the power supply are preferably implemented as functionally different areas of a single conductor track-like means.
  • the means similar to a conductor track itself has no structural separation in the electrode, power supply, etc.
  • the individual areas are rather defined by their function.
  • the electrode is consequently the area of the conductor-like means, which is located within the discharge vessel.
  • the term “overlap” at the power supply end of an inner wall electrode is to be interpreted as an overlap.
  • the lamp according to the invention is relatively easy to manufacture.
  • Materials which have a secondary electron emission coefficient greater than one, in particular greater than two, preferably greater than 3, particularly preferably in the range between 3 and 15 are suitable for the SEE coating.
  • Powdery Al 2 ⁇ 3 or MgO in a pasty preparation is particularly suitable.
  • the relevant end of the lamp is then simply dipped into the paste until the desired overlap with the corresponding electrode end is achieved.
  • the SEE coating has the outer shape of a ring.
  • the outer wall of the discharge vessel is advantageously covered during immersion. In principle, however, it is sufficient to improve the ignition behavior if the SEE coating is limited to a relatively small part of a ring, as long as the end of at least one electrode is covered with it.
  • a thin-walled hollow cylinder or longitudinal part of a hollow cylinder is suitable as a mask, the outer diameter of which corresponds approximately to the inner diameter of the discharge vessel.
  • the wall of the hollow cylinder has an opening, the shape of which corresponds to that of the coating to be applied.
  • the hollow cylinder is inserted at the end of the tubular discharge vessel until the opening lies above the electrode end and then the paste is applied inside the opening to the inner wall of the discharge vessel or the electrode end. After the paste has dried and possibly heated, the mask can be removed.
  • At least one end of only a single electrode has an SEE coating. If the lamp is intended for operation with unipolar voltage pulses, the SEE coating must be arranged on the anode. Only then can primary electrons be accelerated in the direction of the SEE coating and secondary electrons can be triggered there for the further development of the ignition process. This distinction is irrelevant for lamps for operation with bipolar voltage pulses, since the electrodes change their roles in pairs (instantaneous anode or cathode) depending on the polarity of the instantaneous voltage pulse.
  • the discharge lamp according to the invention has a base at one or both ends.
  • the SEE coating is then advantageously arranged on that part of the inner wall of the discharge vessel which is located within the base, since in this way there is no longer any additional shadowing from the SEE coating.
  • this variant increases the probability of a quick and reliable ignition. It may be sufficient if both coating zones are narrower than when coating at only one end.
  • Figure la is a plan view of a first embodiment
  • FIG. 1 b shows a cross section of the exemplary embodiment from FIG. 1 a along the line DD
  • Figure 2 shows a second embodiment.
  • FIGS la and lb schematically show a rod-shaped fluorescent lamp 1 in plan view or in cross section along the line DD.
  • the lamp 1 consists essentially of a tubular discharge vessel 2 made of soda-lime glass with a circular cross section and two strip-shaped electrodes 3 (the second electrode is covered and therefore not visible) made of silver solder, which is arranged parallel to the longitudinal axis of the tube and diametrically arranged to one another on the inside of the wall of the Discharge vessel 2 are applied.
  • Each of the inner wall electrodes 3 is covered with a dielectric barrier 4 made of glass solder.
  • the inside of the wall of the discharge vessel is covered with a phosphor layer 5 and, with the exception of an aperture extending along the longitudinal axis of the lamp, with the VUV / VIS reflection layer 6 made of Al 2 ⁇ 3 below the phosphor layer 5 (for illustrative reasons only in FIG. 1b shown).
  • a first end of the discharge vessel 2 is closed by means of a blunt fusion 7.
  • the electrodes 3 are passed gas-tight to the outside through the other end of the discharge vessel 2 and pass there into an external power supply 8.
  • the second end of the discharge vessel 2 is closed by means of a plate-shaped closure element (not visible in this illustration).
  • the edge of the plate-shaped closure element is fused with a constriction 9 of the discharge vessel 2.
  • DE-A 10048410 the disclosure content of which is hereby incorporated by reference. Due to the aforementioned technology, the inner wall electrode 3, the electrical leadthrough in the area the constriction 9 and the power supply 8 are realized as functionally different areas of a single conductor strip-like silver solder strip.
  • the ring-shaped MgO coating 10 closes on the one hand directly with the end 5 of the discharge vessel 2 and was produced by immersing this end of the vessel in an MgO paste.
  • shadowing by the MgO ring 10 is limited to an annular partial area with a width B of only 5 mm. This is only approx. 1.5% based on the total light length of the lamp 1 of 350 mm (measured from the constriction 9 to the end of the electrodes 3).
  • FIG. 2 shows a schematic top view of a variant of the embodiment of FIGS. 1 a, 1 b (the same features are provided with the same reference numerals), in which an MgO coating in the form of two short 5 mm wide partial rings 11 on the plate seal or Constriction 9 directly adjacent ends of both electrodes 3 are applied. More precisely, each of the two partial rings 11 (one of the two partial rings 11 is covered due to the illustration) is applied to the phosphor covering the electrodes 3 or the dielectric 4. In addition, this end of the lamp 1 is provided with a base, not shown, which covers the two partial MgO rings 11.

Landscapes

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

Abstract

L'invention concerne une lampe à décharge à effet barrière (1) diélectrique comprenant un récipient de décharge (2) tubulaire et une couche de substance luminescente sur au moins une partie de la paroi intérieure du récipient de décharge (2) et des électrodes (3) oblongues. Ladite lampe à décharge à effet barrière comporte, au moins à une extrémité du récipient de décharge (2) tubulaire, sur une zone partielle de la paroi intérieure, un revêtement (10) qui recouvre par ailleurs une extrémité d'au moins une électrode (3) oblongue. Le matériau constituant ce revêtement (10) présente un coefficient d'émission d'électrons secondaires élevé. Le comportement à l'allumage de la lampe s'en trouve sensiblement amélioré en cas d'allumage dans l'obscurité.
EP02753000A 2001-08-17 2002-07-09 Lampe d charge tubulaire auxiliaire d'allumage Withdrawn EP1417700A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10140356 2001-08-17
DE10140356A DE10140356A1 (de) 2001-08-17 2001-08-17 Röhrförmige Entladungslampe mit Zündhilfe
PCT/DE2002/002511 WO2003019616A2 (fr) 2001-08-17 2002-07-09 Lampe à décharge tubulaire à auxiliaire d'allumage

Publications (1)

Publication Number Publication Date
EP1417700A2 true EP1417700A2 (fr) 2004-05-12

Family

ID=7695743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02753000A Withdrawn EP1417700A2 (fr) 2001-08-17 2002-07-09 Lampe d charge tubulaire auxiliaire d'allumage

Country Status (8)

Country Link
US (1) US6960874B2 (fr)
EP (1) EP1417700A2 (fr)
JP (1) JP4272517B2 (fr)
KR (1) KR100895369B1 (fr)
CA (1) CA2429386A1 (fr)
DE (1) DE10140356A1 (fr)
TW (1) TW569281B (fr)
WO (1) WO2003019616A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3958131B2 (ja) 2002-07-10 2007-08-15 株式会社リコー イメージセンサユニット
CN100361270C (zh) * 2005-06-17 2008-01-09 东南大学 外电极荧光灯管及其制备工艺
WO2007071074A1 (fr) * 2005-12-21 2007-06-28 Trojan Technologies Inc. Ensemble lampe a rayonnement a excimere, module de source et systeme de traitement de liquide contenant le module
US20080106177A1 (en) * 2006-11-07 2008-05-08 Jansma Jon B Fluorescent lamp utilizing a partial barrier coating resulting in assymetric or oriented light output and process for same
EP2143132B1 (fr) * 2007-04-18 2016-10-19 Philips Lighting Holding B.V. Lampe a decharge a barriere dielectrique
JP5307029B2 (ja) * 2007-12-17 2013-10-02 株式会社オーク製作所 放電ランプ
US20100052533A1 (en) * 2008-08-26 2010-03-04 Seo-Yong Cho Lamp and a method for enhancing the illumination of the lamp
DE102008050189A1 (de) * 2008-10-01 2010-04-15 Osram Gesellschaft mit beschränkter Haftung Verfahren zum Herstellen einer Entladungslampe für dielektrisch behinderte Entladungen
JP5504095B2 (ja) * 2010-08-10 2014-05-28 株式会社オーク製作所 放電ランプ
US8659225B2 (en) 2011-10-18 2014-02-25 General Electric Company High intensity discharge lamp with crown and foil ignition aid
US8766518B2 (en) 2011-07-08 2014-07-01 General Electric Company High intensity discharge lamp with ignition aid

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644288A1 (fr) * 1989-03-13 1990-09-14 Asulab Sa Procede de fabrication d'une dynode et dynode fabriquee selon ce procede
KR930008163B1 (ko) * 1991-04-02 1993-08-26 삼성전관 주식회사 방전관
DE4311197A1 (de) 1993-04-05 1994-10-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle
DE19718395C1 (de) * 1997-04-30 1998-10-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Leuchtstofflampe und Verfahren zu ihrem Betrieb
AU7367100A (en) * 1999-09-11 2001-04-17 Gl Displays, Inc. Gas discharge fluorescent device
US20010033483A1 (en) * 2000-03-01 2001-10-25 Moore Chad Byron Fluorescent lamp composed of arrayed glass structures
DE10048410A1 (de) * 2000-09-29 2002-04-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dielektrische Barriere-Entladungslampe
DE10133326A1 (de) * 2001-07-10 2003-01-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dielektrische Barrieren-Entladungslampe mit Zündhilfe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03019616A2 *

Also Published As

Publication number Publication date
KR100895369B1 (ko) 2009-04-29
US20040021411A1 (en) 2004-02-05
JP2005500664A (ja) 2005-01-06
US6960874B2 (en) 2005-11-01
DE10140356A1 (de) 2003-02-27
TW569281B (en) 2004-01-01
WO2003019616A2 (fr) 2003-03-06
JP4272517B2 (ja) 2009-06-03
WO2003019616A3 (fr) 2003-05-22
CA2429386A1 (fr) 2003-03-06
KR20040021571A (ko) 2004-03-10

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