EP2618362B1 - Émetteur de lumière et procédé de fonctionnement - Google Patents

Émetteur de lumière et procédé de fonctionnement Download PDF

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Publication number
EP2618362B1
EP2618362B1 EP13000279.3A EP13000279A EP2618362B1 EP 2618362 B1 EP2618362 B1 EP 2618362B1 EP 13000279 A EP13000279 A EP 13000279A EP 2618362 B1 EP2618362 B1 EP 2618362B1
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EP
European Patent Office
Prior art keywords
discharge chamber
chamber
discharge
space
lighting means
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.)
Active
Application number
EP13000279.3A
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German (de)
English (en)
Other versions
EP2618362A1 (fr
Inventor
Christoph Kaiser
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.)
Karlsruher Institut fuer Technologie KIT
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Karlsruher Institut fuer Technologie KIT
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Publication of EP2618362A1 publication Critical patent/EP2618362A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/33—Special shape of cross-section, e.g. for producing cool spot
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component
    • 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
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • 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
    • H01J65/044—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 a separate microwave unit

Definitions

  • the present invention relates to the term claimed above and thus relates to bulbs.
  • light sources are sources of visible, ultraviolet or infrared optical radiation which are operated with electrical energy.
  • the exciting field in the gas-filled space in which the plasma is ignited not in all places has a strength that is sufficient for plasma ignition. Rather, the electromagnetic field used for plasma excitation has a spatially limited penetration depth when the high-frequency alternating field is coupled in transmission or surface wave, which is particularly strong in lamps operated with medium and low pressure plasmas with pressures up to several 100 mbar; Such lamps are of particular importance for industrial applications, as UV lamps, energy-saving lamps and fluorescent lamps. Especially with bulbs in which the discharge spaces should remain free of electrodes or - for example, the use of chemically unstable or aggressive substituents - must, so the low penetration depth of the exciting alternating electromagnetic fields is observed.
  • the low penetration depth causes a comparatively low heating of the gas in the discharge space. If it is not possible with a given power to ensure a sufficient temperature for a plasma discharge in the entire discharge space, either a higher power must be coupled or a drop in the efficiency can be accepted.
  • a discharge tube assembly with an excitation device and a discharge tube which is formed of translucent, dielectric material.
  • the excitation device is designed to excite surface waves in the filling of the discharge tube.
  • at least one impedance matching network is provided between a coupling-in point and a high-frequency power source.
  • the gas column is comprised in an elongate, insulated housing, wherein a first metallic tube, which is open on both sides, and a second tube, which surrounds the first, so that a coaxial arrangement is obtained, are provided.
  • a high-frequency lamp for low and high pressure applications that seeks to improve properties in terms of efficiency, emission spectrum, cost and longevity.
  • a high-frequency signal is coupled via a shielded RF line circuit in a designated as ionization glass flask, wherein one or two electrodes in a surrounded with quartz glass and filled with gases or optionally metal vapors and / or halogens ionization protrude or surrounded with quartz glass and externally contact ionization chamber filled with gases and optionally metal vapors and / or halogens and / or sulfur to effect ionization.
  • This known lamp is supposed to be used as a high-pressure as well as a low-pressure gas discharge lamp; It wants to be distinguished by the fact that, depending on the design, it has a small point-shaped or a large spherical ionization region with large current flows and thus high color temperatures with a coverage of up to several square decimeters, so that the setting of the light output can allegedly be varied over a large range.
  • the WO 03 / 047318A1 shows a lamp with centrally located feed antenna. No information is given about the conditions in the area of the feed-in antenna. The same applies to EM Barkhudarov et al. in "Killing Bacteria present on surfaces in films or droplets using microwave UV lamps", ISSN 1573-0972 ,
  • GB 2 400 975 A is a lamp with a arranged between two coaxial cylinders discharge space is known, wherein the space provided inside clear space is open on both sides. The same applies to the lamp according to DE 39 13 519 A showing a curing system for a fiber.
  • the inventor of the present application has proposed a luminous means and a method for operating a luminous means, in which high-frequency waves are coupled into a gas volume for generating and maintaining plasma with only little shadowing, a small construction is achieved, broadband transmissivity for high-frequency waves in the Component is guaranteed, the self-consumption or idle consumption is very low and the high-frequency wave can be easily transported into the interior of the bulb.
  • a light source with a gas volume and a coaxial RF energy coupling device be provided for exciting the same with surface waves, that the coaxial RF energy Einkopplungsvorraumiques has a guided in the gas volume central conductor.
  • the various launchers may in part enable operation with reasonably high efficiency, it is desirable to further increase it and / or to obtain it with other electrode geometries and so on.
  • the temperature in the discharge space of the luminous means influences the efficiency
  • lamps be actively cooled, which makes it possible to couple very high powers and, moreover, contributes to a thermal stabilization.
  • the cooling of lamp bodies can take place here by a fluid flow and is for example common in systems for UV curing of paints.
  • thermal stabilization of luminaires provides to rotate the lamp body. This is known, for example, from sulfur lamps, in which the complete discharge vessel is rotated to avoid local overheating, which is technically complicated.
  • the object of the present invention is to provide new products for commercial use.
  • a space at least partially enclosed by the discharge space brings less heat losses.
  • the convection is reduced. This is true even if the enclosed space is only partially enclosed. Even then, heat removal from the region of high temperature in the discharge space is already substantially reduced, because particles from the region of particularly high temperature are prevented by the wall from unconfined convective and / or diffusion movement into a colder zone.
  • the enclosed space does not necessarily have to be a cavity. Rather, the enclosed space also with Be filled with material, such as glass or other material, where it may be completely or partially filled.
  • the space at least partially enclosed by the discharge space can be configured geometrically in such a way that a desired area results in the discharge chamber in which the gas discharge takes place. This allows a certain power density. It is typically no separate heat supply or removal required.
  • the space from the discharge space is at least partially enclosed, at the same time the heat loss is minimized by radiation, since at least a portion of the reaching into the at least partially enclosed space thermal radiation passes back into the discharge space.
  • the boundary wall between partially enclosed space and discharge space for the wavelength of the respective heat radiation is not or not completely transparent, it will heat up and accordingly emit heat radiation of different wavelength at least in part to an opposite boundary wall, so that at least by re-absorption a reduction in radiation is obtained.
  • the at least partially enclosed by the discharge space Space is a vacuum space, preferably at a pressure of less than 1/10 of the standard atmospheric pressure.
  • the enclosed space may optionally be filled with a certain gas under reduced pressure.
  • the means for microwave coupling are provided for exciting a plasma light.
  • a high power density can be achieved by the design according to the invention.
  • the microwave coupling takes place with discharge space free of electrodes, through the outer wall of the discharge space. This allows the choice of the medium present in the discharge space to be made irrespective of whether chemical reactions occur with materials typically used for electrodes. Thanks to the simultaneously possible by the geometric design adjustment of the power density, the invention thus opens up considerable freedom in terms of the choice of the existing medium in the discharge space, which offers quite significant advantages for the achievement of a particular spectrum to be radiated.
  • the luminous element is formed from glass, quartz glass and / or glass ceramic. This is advantageous because it allows the use per se of long known and proven materials and, accordingly, the use as per se reliably known manufacturing method.
  • the discharge space is arranged at least partially coaxially with the space at least partially enclosed by the discharge space.
  • the enclosed space will be central and the discharge space will be arranged around it. That a central arrangement is also possible where the outer wall of the discharge space is not cylindrical, but, for example, flattened or the like, should be mentioned.
  • the space at least partially enclosed by the discharge space is completely enclosed by the latter at least on one side, preferably on both sides.
  • a luminous means comprises a luminous body which a discharge space 1 and a means for thermal stabilization 2, which is formed as a space 2 at least partially enclosed by the discharge space 1.
  • the light-emitting means 1 has external electrodes (not shown), which are arranged on the outer wall of the discharge space 1 in per se known manner and feed high-frequency energy into the substances present in the interior of the discharge space.
  • the outer electrodes (not shown) are connected to a suitable high frequency power source of sufficient power.
  • the discharge generating bulb has been filled with, for example, indium-argon to achieve discharge with indium iodide as a carrier to achieve the required partial pressures of the indium.
  • the luminous element is made of quartz glass in the present embodiment.
  • a cylindrical quartz glass body is formed with vertical to the cylinder wall end faces, which are also made of quartz glass.
  • an inner cylinder coaxial with the outer quartz glass body is now provided, which is also closed at its end faces by the vertical end faces of quartz glass (in FIG Fig. 2 not shown) .
  • the partially enclosed by the discharge space and against the ambient atmosphere through this together with the vertical end surfaces of quartz glass completely sealed against the ambient atmosphere space is evacuated, here - as preferred - to a pressure of less than 1/10 of the standard atmospheric pressure.
  • the plasma discharge generated by the high frequency power has its hottest point away from the central axis of the cylinder. Due to the temperature gradient less heat radiation is received from other areas in the direction of the central axis as in this emitted. A considerable part of the radiation emitted in the space 2 partially enclosed by the discharge space 1 will, however, pass through this partially enclosed space 2 in such a way that it again enters the discharge space 1 on the opposite side, where the radiation Moreover, some can be absorbed again, for example, from the plasma present there. Since the pressure in the space 2 partially enclosed by the discharge space 1 is small, the otherwise occurring convective heat transport to the end surfaces made of quartz glass is also correspondingly irrelevant. The total heat loss of the arrangement according to the invention is thus low.
  • the space partially enclosed by the discharge space 1 thus serves for thermal stabilization and can thus be regarded as a means for thermal stabilization.
  • Fig. 1b is one of the two cylinder end faces of the discharge space, which in Fig. 1a closed by flat round quartz glass plates, completed by a hemispherical rounding.
  • the boundary wall between the discharge space 1 and the partially enclosed by this space 2 is also continued by a hemispherical rounding end.
  • the distance between the outer wall and boundary wall is chosen to be as large here in the area of the hemispherical rounding as on the cylinder jacket area.
  • Fig. 1c is also the second of the two cylinder end faces in Fig. 1a closed by flat round quartz glass plates, replaced by a hemispherical conclusion of the discharge space.
  • the boundary wall between the discharge space 1 and the partially enclosed by this space 2 is also formed by a hemispherical curve.
  • the distance between the outer and boundary wall in the region of the hemispherical curves here chosen to be as large as the cylinder jacket area. It encloses so in the embodiment of Fig. 1c the discharge space 1 the thermally stabilizing space 2 here completely.
  • the power density of the excitation power of the gas discharge resulting from a luminous means can easily be optimized. Since at the same time by the present invention, substances are used for the first time or at least easier, their partial pressure is set in the discharge by the existing temperature and would be too cold spots, the design of bulbs undergoes significant relief and enhancements. In particular, it becomes possible to provide mercury-free lamps, which offers particular advantages.
  • thermal stabilization of a gas discharge vessel by a space separated from the discharge space can also bring advantages where it does not depend on the emission of visible radiation, but a gas discharge other reasons is needed.

Claims (8)

  1. Source lumineuse avec un corps lumineux avec
    une chambre de décharge sans électrode (1), qui comporte une paroi extérieure et dans laquelle des microondes sont couplées, et
    un moyen de stabilisation thermique, qui comprend une chambre (2) séparée de la chambre de décharge (1) par une paroi de limitation, entourée au moins partiellement par la chambre de décharge (1) et centrale par rapport à la chambre de décharge (1), caractérisée en ce que
    il est prévu sur la paroi extérieure de la chambre de décharge (1) des électrodes extérieures, qui sont conçues pour coupler des microondes dans la chambre de décharge (1) à travers la paroi de celle-ci, et
    la chambre (2) entourée au moins partiellement par la chambre de décharge (1) est une chambre sous vide fermée ou est remplie de matériau solide, afin de réduire ainsi une transmission de chaleur de la chambre de décharge à travers la paroi de limitation limitant la chambre de décharge.
  2. Source lumineuse selon la revendication 1, caractérisée en ce que la chambre (2) entourée au moins partiellement par la chambre de décharge (1) est une chambre sous vide fermée et présente une pression de moins de 1/10 de la pression atmosphérique normale, en particulier de préférence de moins de 1/100 de la pression atmosphérique normale.
  3. Source lumineuse selon la revendication 1, caractérisée en ce que la chambre (2) entourée au moins partiellement par la chambre de décharge (1) est remplie de verre.
  4. Source lumineuse selon l'une quelconque des revendications précédentes, caractérisée en ce que les électrodes extérieures sont conçues pour coupler des microondes afin d'exciter une lampe à plasma.
  5. Source lumineuse selon l'une quelconque des revendications précédentes, caractérisée en ce que le corps lumineux est formé de verre, de verre de quartz et/ou de vitrocéramique.
  6. Source lumineuse selon l'une quelconque des revendications précédentes, caractérisée en ce que la chambre de décharge (1) et la chambre (2) entourée au moins partiellement par la chambre de décharge (1) sont disposées de façon coaxiale l'une à l'autre.
  7. Source lumineuse selon l'une quelconque des revendications précédentes, caractérisée en ce que la chambre (2) entourée au moins partiellement par la chambre de décharge (1) est entourée entièrement par celle-ci au moins sur un côté.
  8. Source lumineuse selon l'une quelconque des revendications précédentes, caractérisée en ce que la chambre (2) entourée au moins partiellement par la chambre de décharge (1) est enfermée entièrement à l'intérieur de la chambre de décharge.
EP13000279.3A 2012-01-20 2013-01-21 Émetteur de lumière et procédé de fonctionnement Active EP2618362B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012001000A DE102012001000A1 (de) 2012-01-20 2012-01-20 Leuchtmittel und Betriebsverfahren dafür

Publications (2)

Publication Number Publication Date
EP2618362A1 EP2618362A1 (fr) 2013-07-24
EP2618362B1 true EP2618362B1 (fr) 2019-09-11

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Application Number Title Priority Date Filing Date
EP13000279.3A Active EP2618362B1 (fr) 2012-01-20 2013-01-21 Émetteur de lumière et procédé de fonctionnement

Country Status (2)

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EP (1) EP2618362B1 (fr)
DE (1) DE102012001000A1 (fr)

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FR2290126A1 (fr) 1974-10-31 1976-05-28 Anvar Perfectionnements apportes aux dispositifs d'excitation, par des ondes hf, d'une colonne de gaz enfermee dans une enveloppe
US4065701A (en) * 1976-07-14 1977-12-27 Gte Laboratories Incorporated Electrodeless light source with reduced heat losses
US4963790A (en) * 1985-12-27 1990-10-16 Gte Products Corporation Low wattage metal halide discharge lamp
US4871946A (en) * 1988-03-14 1989-10-03 General Electric Company Electrodeless high intensity discharge lamp
JP2805009B2 (ja) 1988-05-11 1998-09-30 株式会社日立製作所 プラズマ発生装置及びプラズマ元素分析装置
GB8821672D0 (en) 1988-09-02 1988-10-19 Emi Plc Thorn Discharge tube arrangement
DE3913519C2 (de) * 1989-04-25 1996-06-27 Rheydt Kabelwerk Ag UV-Aushärtesystem für optische Fasern
JPH06203807A (ja) * 1992-12-28 1994-07-22 Toshiba Lighting & Technol Corp 無電極放電灯およびその点灯回路ならびにこれを用いた照明装置
US5438235A (en) * 1993-10-05 1995-08-01 General Electric Company Electrostatic shield to reduce wall damage in an electrodeless high intensity discharge lamp
JP3202910B2 (ja) * 1995-12-04 2001-08-27 松下電器産業株式会社 マイクロ波放電ランプ
ITPI20010078A1 (it) * 2001-11-29 2003-05-29 Cnr Consiglio Naz Delle Rice R Metodo per la produzione con una lampada senza elettrodi di una radiazione uv. visibile o ir e lampada che attua tale metodo
US6747419B2 (en) * 2002-07-03 2004-06-08 Ushio America, Inc. Method and apparatus for heat pipe cooling of an excimer lamp
JP2004127538A (ja) * 2002-09-30 2004-04-22 Harison Toshiba Lighting Corp 冷陰極蛍光ランプ
GB2400975B (en) * 2003-04-17 2006-04-12 Jenact Ltd A light source and a method of manufacture thereof
KR20040107335A (ko) * 2003-06-13 2004-12-20 (주)아트램프 무전극 자외선램프
DE10335523B4 (de) 2003-07-31 2009-04-30 Koch, Berthold, Dr.-Ing. Vorrichtung zur Plasmaerregung mit Mikrowellen
WO2008029328A1 (fr) * 2006-09-05 2008-03-13 Koninklijke Philips Electronics N.V. Lampe à décharge de gaz basse pression possédant un rendement amélioré
US7993528B2 (en) * 2007-04-25 2011-08-09 Necamp David Richard Method and apparatus for treating materials using electrodeless lamps
WO2010079446A2 (fr) * 2009-01-09 2010-07-15 Koninklijke Philips Electronics N.V. Lampe à décharge moléculaire sans mercure
DE102009022755A1 (de) 2009-05-26 2010-12-02 Fachhochschule Aachen Hochfrequenzlampe über Impedanztransformation

Non-Patent Citations (1)

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Publication number Publication date
EP2618362A1 (fr) 2013-07-24
DE102012001000A1 (de) 2013-07-25

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