EP0981831A1 - Lampe a decharge avec electrodes inhibees dielectriquement - Google Patents

Lampe a decharge avec electrodes inhibees dielectriquement

Info

Publication number
EP0981831A1
EP0981831A1 EP99915495A EP99915495A EP0981831A1 EP 0981831 A1 EP0981831 A1 EP 0981831A1 EP 99915495 A EP99915495 A EP 99915495A EP 99915495 A EP99915495 A EP 99915495A EP 0981831 A1 EP0981831 A1 EP 0981831A1
Authority
EP
European Patent Office
Prior art keywords
die
discharge
dielectric
electrodes
shield
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
EP99915495A
Other languages
German (de)
English (en)
Other versions
EP0981831B1 (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.)
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 EP0981831A1 publication Critical patent/EP0981831A1/fr
Application granted granted Critical
Publication of EP0981831B1 publication Critical patent/EP0981831B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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 discharge lamp according to the preamble of claim 1.
  • This discharge lamp has a discharge vessel including a gas filling, at least parts of the discharge vessel being used for radiation of a desired spectral range, in particular light, i.e. visible electromagnetic radiation, or also ultraviolet (UN) and vacuum ultraviolet (VUN) radiation are transparent.
  • a desired spectral range in particular light, i.e. visible electromagnetic radiation, or also ultraviolet (UN) and vacuum ultraviolet (VUN) radiation are transparent.
  • a number of electrodes produce a discharge in the gas filling.
  • the discharge either generates the desired radiation directly or the radiation emitted by the discharge is converted into the desired radiation with the aid of a phosphor.
  • dielectric barrier discharge it is a discharge lamp which is suitable for operation by means of dielectric barrier discharge.
  • the electrodes of one polarity or all electrodes that is to say both polarities, are separated from the gas filling or from the discharge during operation by means of a dielectric layer (one-sided or two-sided dielectric barrier discharge, see for example WO 94/23442 or EP 0 363 832).
  • dielectric barrier is also used for this dielectric layer, and the term “barrier discharge” is also used for discharges produced in this way. It must also be clarified that the dielectric barrier does not have to be a layer applied to an electrode specifically for this purpose, but can also be formed, for example, by a discharge vessel wall if electrodes are arranged on the outside of such a wall or inside the wall.
  • EMI electromagnetic interference radiation
  • the discharge lamp comprise an electrically conductive shield which at least partially surrounds the discharge vessel.
  • the shield is electrically isolated from at least one electrode, depending on the electrical potential, and possibly from all electrodes.
  • the thickness du and the dielectric constant S D of the dielectric as well as the thickness dß and the dielectric constant SB are the barrier which the electrodes of the gas filling separates, specifically coordinated so that the following relationships are fulfilled:
  • the electrical power is already coupled to the shield to an unacceptable degree. Reliable operation of the dielectric barrier discharge within the discharge vessel of the lamp is then no longer reliably guaranteed under all operating conditions.
  • the capacitive decoupling of the shield from the dielectric barrier discharge also increases with increasing factor F.
  • relatively high factors F are aimed for.
  • high factors F mean a large ratio between the thicknesses of the dielectric and the barrier.
  • the thickness of the dielectric must be correspondingly greater than the thickness of the barrier in this case.
  • the thickness of the dielectric is limited for cost and design reasons. As a result, there is only the possibility of reducing the thickness of the barrier, which in turn places high demands on the precision of the barrier in order not to negatively influence the uniformity of the dielectric barrier discharge. In a specific individual case, a suitable compromise may have to be made here.
  • the dielectric constant S B of the barrier is larger or even significantly larger than the dielectric constant SD of the dielectric, correspondingly high factors F can also be realized.
  • the dielectric which separates the shield from the electrodes, is formed by the wall of the discharge vessel itself.
  • the electrodes with an electrical potential different from the shielding are deliberately placed on the in- nenwand the discharge vessel arranged.
  • the dielectric between the shield and the electrodes can also be composed of two or more layers with different dielectric numbers. Under certain circumstances, this can be particularly useful in the area of the electrodes in order to be able to reliably meet the above-mentioned conditions there even with a relatively thin discharge vessel wall.
  • the barrier can also be constructed from several layers with different dielectric numbers.
  • the index i assumes the value 1 for a single-layer system, the values 1 and 2 for a two-layer system and accordingly the values 1, 2, ... n for an n-layer system.
  • the electrodes are arranged such that the layer of the vessel wall facing the interior of the discharge vessel is thinner than the layer facing the shield.
  • the shield is designed, for example, as a metallic jacket with an opening.
  • the opening defines the effective radiation area of the lamp.
  • At least part of the jacket is further developed into cooling fins.
  • the jacket performs a double function, namely on the one hand the shielding effect and on the other hand the dissipation of the heat loss generated by the discharge and / or possibly the electronics for operating the lamp. Since the lamp is expediently in particularly close contact with the jacket, a good homogenization of the temperature distribution along the contact zone between lamp and jacket is also ensured.
  • the shielding effect can be further improved if at least the part of the outer wall of the discharge vessel facing the jacket opening is covered by an electrically conductive, transparent layer, e.g. made of indium tin oxide (ITO).
  • ITO indium tin oxide
  • the jacket and the transparent layer are electrically contacted with one another.
  • the jacket can also be realized entirely by the electrically conductive, transparent layer.
  • the cooling effect of the jacket must then be dispensed with in this variant.
  • the shield can be at floating electrical potential, but is advantageous with a ground, e.g. Earth, connected potential to prevent possible electromagnetic radiation from the shield itself.
  • a ground e.g. Earth
  • the figure shows a cross section of a rod-shaped aperture fluorescent lamp with shielding in a schematic representation.
  • the lamp 1 essentially consists of a tubular discharge vessel 2 with a circular cross section, which is surrounded by a shield, and three strip-shaped electrodes 3-5, which are applied parallel to the longitudinal axis of the tube on the inside wall of the discharge vessel 2. Each of the inside wall electrodes 3-5 is covered with a dielectric layer 6-8. Furthermore, the inside wall of the discharge vessel 2 is, with the exception of a rectangular aperture 9, with a reflection double layer 10 made of A1 0 3 and Ti 0. A phosphor layer 11 is applied to the reflection double layer 10 and also to the inner wall of the vessel in the area of the aperture 9. The reflection double layer 10 reflects the light generated by the phosphor layer 11. In this way, the luminance of the aperture 9 is increased.
  • the outer diameter of the tubular discharge vessel 2 is approximately 9 mm. Xenon with a filling pressure of 160 torr is located within the discharge vessel 2.
  • the electrodes 3-5 are passed through a first end of the discharge vessel 2 in a gas-tight manner to the outside and there each change into an external power supply (not shown). At its other end, the discharge vessel 2 is also sealed gas-tight with a dome (not shown) formed from the vessel.
  • a first 5 of the three electrodes 3-5 is provided for a first polarity of a supply voltage, while the other two electrodes 4, 5 are provided for the second polarity.
  • the first electrode 5 is diametrical to
  • Aperture 9 and the two other electrodes 4, 5 are in the immediate vicinity - 7 -
  • the width and the length of the aperture 5 are approximately 6.5 mm and 255 mm, respectively.
  • the barrier consists of glass solder with a dielectric constant of approx. 8 and a thickness of approx. 250 ⁇ m. This results in a quotient from the barrier thickness to the dielectric constant of approx. 0.031 mm.
  • the discharge vessel 2 consists of low-alkali soda-lime glass (Schott # 8350) with a dielectric constant of approx. 7 and a wall thickness of approx. 0.6 mm. This results in a quotient from wall thickness to dielectric constant of approx. 0.086 mm. This quotient is approx. 2.77 times larger than the corresponding quotient for the barrier. Consequently, the relationship required in the general description is fulfilled here.
  • the shielding of the lamp 1 consists of a solid, essentially cuboid, metallic jacket 12 and a transparent layer 13.
  • the jacket 12 has an opening corresponding to the lamp aperture 9 in such a way that only the aperture 9 of the lamp is visible from the outside.
  • the transparent layer 13 consists of indium tin oxide (ITO) and covers the outer wall of the discharge vessel 2 only in the area of the aperture 9.
  • ITO indium tin oxide
  • the transparent layer 13 is electrically contacted with the jacket 12 along its opening and therefore completes the shielding effect of the jacket 12 versus EMI.
  • the jacket 12 has a number of cooling fins 14 on its side opposite the opening.
  • a thermal paste 15 improves the heat transfer between the discharge vessel 2 and the jacket 12.
  • the phosphor layer 11 is a three-band phosphor. It consists of a mixture of the blue component BaMgAl ⁇ oOi7 * Eu, the green component LaP0: Ce, Tb and the red component (Y, Gd) B0 3 : Eu. - 8th -

Landscapes

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

Abstract

L'invention concerne une lampe à décharge (1) comportant un blindage électroconducteur (12, 13) qui entoure au moins partiellement l'enceinte de décharge (2). Les électrodes (3-5) sont séparées de l'intérieur de l'enceinte de décharge (2) par une barrière diélectrique (6-8). En outre, le blindage (12, 13) est séparé galvaniquement des électrodes (3-5) par un diélectrique (2). Afin d'empêcher dans une large mesure le couplage capacitif de la puissance électrique, acheminée aux électrodes de lampe (3-5) pendant le fonctionnement, au blindage électroconducteur (12, 13), l'épaisseur dD et la constante diélectrique epsilon D du diélectrique (2), ainsi que l'épaisseur dB et la constante diélectrique epsilon B de la barrière (6-8), qui sépare les électrodes (3-5) du gaz de remplissage, sont adaptées les unes aux autres de façon à satisfaire à la relation: dD/ epsilon D>/=1,5.dB/ epsilon B.
EP99915495A 1998-03-17 1999-03-02 Lampe a decharge avec electrodes inhibees dielectriquement Expired - Lifetime EP0981831B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19811520A DE19811520C1 (de) 1998-03-17 1998-03-17 Entladungslampe mit dielektrisch behinderten Entladungen
DE19811520 1998-03-17
PCT/DE1999/000543 WO1999048134A1 (fr) 1998-03-17 1999-03-02 Lampe a decharge avec electrodes inhibees dielectriquement

Publications (2)

Publication Number Publication Date
EP0981831A1 true EP0981831A1 (fr) 2000-03-01
EP0981831B1 EP0981831B1 (fr) 2001-09-19

Family

ID=7861172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99915495A Expired - Lifetime EP0981831B1 (fr) 1998-03-17 1999-03-02 Lampe a decharge avec electrodes inhibees dielectriquement

Country Status (9)

Country Link
US (1) US6304028B1 (fr)
EP (1) EP0981831B1 (fr)
JP (1) JP4108770B2 (fr)
KR (1) KR100563745B1 (fr)
AT (1) ATE205961T1 (fr)
CA (1) CA2289536C (fr)
DE (2) DE19811520C1 (fr)
HU (1) HU223240B1 (fr)
WO (1) WO1999048134A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19843419A1 (de) * 1998-09-22 2000-03-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Entladungslampe mit dielektrisch behinderten Elektroden
EP1111656A4 (fr) * 1999-06-07 2007-03-28 Toshiba Lighting & Technology Tube a decharge, dispositif a tube a decharge et lecteur d'images
DE19955108A1 (de) * 1999-11-16 2001-05-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Entladungslampe mit verbesserter Temperaturhomogenität
DE10048409A1 (de) * 2000-09-29 2002-04-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Entladungslampe mit kapazitiver Feldmodulation
US6762556B2 (en) * 2001-02-27 2004-07-13 Winsor Corporation Open chamber photoluminescent lamp
DE10133326A1 (de) * 2001-07-10 2003-01-23 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dielektrische Barrieren-Entladungslampe mit Zündhilfe
WO2004083900A2 (fr) * 2003-03-18 2004-09-30 Philips Intellectual Property & Standards Gmbh Lampe a decharge gazeuse
US7863816B2 (en) * 2003-10-23 2011-01-04 General Electric Company Dielectric barrier discharge lamp
US7495376B2 (en) * 2003-12-09 2009-02-24 Panasonic Corporation Light source device, lighting device, and liquid crystal display device
US7196473B2 (en) * 2004-05-12 2007-03-27 General Electric Company Dielectric barrier discharge lamp
DE102004047375A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dielektrische behinderte Entladungslampe mit Manschette
DE102004047374A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dielektrisch behinderte Entladungslampe mit elektrischer Abschirmung
DE102004047376A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Dielektrisch behinderte Entladungslampe mit steckbaren Elektroden
DE102004047373A1 (de) * 2004-09-29 2006-04-06 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Beleuchtungssystem mit dielektrisch behinderter Entladungslampe und zugehörigem Vorschaltgerät
JP7429424B2 (ja) 2020-01-14 2024-02-08 株式会社ムラコシ精工 引戸装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH676168A5 (fr) * 1988-10-10 1990-12-14 Asea Brown Boveri
US5220236A (en) * 1991-02-01 1993-06-15 Hughes Aircraft Company Geometry enhanced optical output for rf excited fluorescent lights
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
US5325024A (en) 1992-10-16 1994-06-28 Gte Products Corporation Light source including parallel driven low pressure RF fluorescent lamps
DE4311197A1 (de) * 1993-04-05 1994-10-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle
JPH10223182A (ja) * 1997-02-10 1998-08-21 Stanley Electric Co Ltd 蛍光ランプ
JP3218561B2 (ja) * 1997-06-27 2001-10-15 スタンレー電気株式会社 蛍光ランプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9948134A1 *

Also Published As

Publication number Publication date
HUP0002438A3 (en) 2001-12-28
JP2001526828A (ja) 2001-12-18
WO1999048134A1 (fr) 1999-09-23
KR100563745B1 (ko) 2006-03-24
KR20010012672A (ko) 2001-02-26
CA2289536A1 (fr) 1999-09-23
EP0981831B1 (fr) 2001-09-19
CA2289536C (fr) 2007-05-15
JP4108770B2 (ja) 2008-06-25
HUP0002438A2 (hu) 2000-11-28
US6304028B1 (en) 2001-10-16
DE19811520C1 (de) 1999-08-12
DE59900265D1 (de) 2001-10-25
ATE205961T1 (de) 2001-10-15
HU223240B1 (hu) 2004-04-28

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