EP2659503A1 - Luminaire et son procédé de fonctionnement - Google Patents

Luminaire et son procédé de fonctionnement

Info

Publication number
EP2659503A1
EP2659503A1 EP11822886.5A EP11822886A EP2659503A1 EP 2659503 A1 EP2659503 A1 EP 2659503A1 EP 11822886 A EP11822886 A EP 11822886A EP 2659503 A1 EP2659503 A1 EP 2659503A1
Authority
EP
European Patent Office
Prior art keywords
energy
gas volume
lamp according
coaxial
central conductor
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
EP11822886.5A
Other languages
German (de)
English (en)
Other versions
EP2659503B9 (fr
EP2659503B1 (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
Original Assignee
Karlsruher Institut fuer Technologie KIT
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
Priority claimed from DE201110008944 external-priority patent/DE102011008944A1/de
Application filed by Karlsruher Institut fuer Technologie KIT filed Critical Karlsruher Institut fuer Technologie KIT
Publication of EP2659503A1 publication Critical patent/EP2659503A1/fr
Application granted granted Critical
Publication of EP2659503B1 publication Critical patent/EP2659503B1/fr
Publication of EP2659503B9 publication Critical patent/EP2659503B9/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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 generic term Bean ⁇ claimed and thus relates to bulbs.
  • light sources are sources of visible, ultraviolet or infrared optical radiation which are operated with electrical energy. In principle, it is desirable to illuminate illuminants with a reasonable expenditure of energy very brightly. It has already been proposed to excite a gas volume by supplying electrical high-frequency energy so far that a luminous plasma is formed.
  • a device for plasma excitation with microwaves is known from DE 103 35 523 B4, in which a microwave conductor feed line is branched and there are formed stalk electrodes whose length leads to a microwave phase shift.
  • a plasma generating device using microwaves is further known, for example, from US 4,908,492.
  • a cylindrical RF conductor arrangement with a cylindrical outer conductor and a helical inner conductor, between which microwave energy is supplied.
  • a discharge tube Within the helical coil is a discharge tube to be ordered. Restrictions on dimensions and shape should be eliminated and sufficient energy should be able to be coupled into the gas or plasma. It should be mentioned as a light source of high brightness and short wavelength for purposes of optical reactions.
  • US 5,072,157 discloses a discharge tube assembly with an excitation device and with a discharge tube formed of transparent 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.
  • a device in which a plasma is generated in a gas column by exciting a surface wave with high-frequency energy.
  • the surface wave generating means for RF energy injection extends only over part of the gas column and so much power is provided in the exciting electric field that the generated plasma expands beyond the corresponding part of the gas column.
  • 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.
  • microwave excitation of the gas volumes in light ⁇ convey to the prior art per se beneficial and he wishes ⁇ because for example, high luminance can be achieved.
  • the disadvantage is that as a rule the use of resonant structures is required, which is contrary to the operation with cheaper broadband energy sources ⁇ ;
  • shading of the luminous volume by the surrounding structures is often caused or shielding of the coupled-in high-frequency energy is required.
  • the present invention proposes in a first
  • the idea is to have a light source with a gas volume and a coaxial RF energy input device for exciting it with evanescent fields of surface waves, wherein it is provided that the coaxial RF energy input device has a central conductor guided into the gas volume.
  • a central conductor that is to say a central conductor arranged on the axis of the coaxial RF energy coupling device
  • the light generated by plasma lamps is initially not shaded by the latter.
  • the central conductor is preferably located exactly centrally on the axis of the coaxial RF energy coupling device, deviations, preferably only small deviations from a central position, are possible. This reduces the cost of the lamp insofar as possibly lower manufacturing precision is required.
  • the gas volume surrounds the central conductor; Thus, the light emerging from the plasma chamber is not shadowed by the coupling structure.
  • the arrangement according to the invention generates surface waves particularly efficiently, which is advantageous since surface waves have at most a low electromagnetic radiation. Accordingly, shielding is not required or at best only very small shielding measures have to be taken. This is advantageous insofar as the shielding has typically led to a significant reduction in the efficiency, that is to say the efficiency, of the lamps or lamps operated by microwaves.
  • the gas volume as high pressure volume to serve lighting purposes. This is especially true if a light source with high brilliance, that is high color temperature and high luminance, is desired. It should be mentioned here, for example, the lighting in the interior, which can be achieved by suitable gas fillings, etc. possibly even a desired color temperature.
  • the pressure inside high pressure lamps can be a few bar.
  • the fact that the present invention can also be used for low-pressure lamps operating at pressures in the range of up to a few millibars is also mentioned.
  • resulting UV radiation can either be emitted and used directly as such or converted via fluorescence substances into spectral regions which are more suitable for the respective illumination and / or irradiation purposes.
  • the light source is to generate short-wave optical radiation, that is to say ultraviolet radiation, which is to be used directly, or via conventional fluorescence means visible radiation is to be implemented.
  • short-wave optical radiation that is to say ultraviolet radiation
  • visible radiation visible radiation
  • bulbs can be provided for generating biologically active radiation, for example for water disinfection in sewage treatment plants or for the food industry, as well as illuminants with which photochemical reactions are triggered in paint shops or the like, that is, for example, hardening of coatings. Adhesives and the like is initiated.
  • their enveloping bodies which typically consist of suitable types of glass, may be coated with fluorescent dyes and the like. may be provided to provide in per se known manner for the conversion of the UV radiation generated in the light source in the desired spectral ranges.
  • the light source is adjusted accordingly. will be fitting.
  • pressure-dependent different thicknesses may be optionally for surrounding the gas volume Col ⁇ ben selected and / or different materials, for example in the case of UV medium pressure lamps materials that are particularly well UV-transparent, for example quartz glass.
  • the gas volume will be typically elongated, that is arranged approximately in an elongated cylinder or the like.
  • the coaxial line is typically designed for the energy supply or the power line in the fundamental mode of the coaxial conductor.
  • the illuminant of the present invention is a non-resonant system, which in turn makes it possible to operate the illuminant broadband, that is, for example, to use a broadband Hochfre ⁇ quenz energy source or even pulsed, even briefly pulsed energy to feed.
  • a broadbandxges pulses is not possible; so that there short, that is particularly broadband impulses, not be generated.
  • a demand for the precision of the high-frequency energy source that has been reduced to that extent can also be achieved, which in turn reduces the costs.
  • Another advantage resulting from the possibility of non-resonant operation is that no particular dimensions must be observed for the components used to satisfy any resonance conditions. This allows in particular the use of very small Structures and thus creates a high potential of miniaturization.
  • the frequency of the high-frequency energy source varies slightly due to thermal effects or the like, there is no significant variation in the luminosity, since the coupling of the electromagnetic wave into the plasma takes place virtually independently of the frequency.
  • the arrangement will typically be designed so that power that is not needed for plasma generation is reflected back. It should be noted that the possible power consumption of the light source varies after the start, for example because the lamp must still be warm and thereby energy absorbing processes are improved, such as the pressure increases due to the heating or the like. For high-pressure lamps, the pressure can rise to a few hundred bars.
  • the self-regulation through power reflection is advantageous in that no power regulator must be connected upstream.
  • the central conductor can be galvanically connected to the gas volume, but this is not mandatory. Rather, it is preferred if the central conductor is not galvanically connected to the gas volume, but is galvanically separated from it. This offers advantages, because the central conductor with galvanic separation of the gas volume also not can come into contact with the plasma. Accordingly, the center conductor can not be attacked by the plasma, as otherwise electrodes, which improves the durability.
  • the central conductor protrudes beyond the coaxial jacket. In this case, the central conductor is still preferably within the gas volume in the region projecting beyond the coaxial jacket. The central conductor is thus included in the gas volume.
  • the gas light space can be at least largely, preferably completely shielding-free.
  • Plasma excitation and surface wave formation can take place in the actual coupling structure, wherein the surface wave formed can extend along the central conductor along the central conductor along the shielding of the coupling structure and at least through the protruding coaxial sheath over the coaxial sheath initially surrounding it in that area, in which the central conductor protrudes beyond the jacket, a complete shielding freedom is given. Since no high-frequency waves must be shielded, light is not shaded there either.
  • FIG. 1 1 comprises a generally designated 1 light ⁇ medium a gas volume 2 and a coaxial RF energy coupling device 3 for exciting the gas volume 2 using surface acoustic waves, wherein the coaxial RF energy launcher 3 a into the gas volume 2 guided center ⁇ conductor 4 has.
  • the luminous means 1 is filled as a low-pressure luminous means with a gas of in this case 30 mbar, here for example argon.
  • the gas volume 2 is enclosed in an elongated glass bulb 2 a, which is indicated only by dashed lines in Fig. 1.
  • the glass bulb does not extend into the interior of the coupling structure 3, but only close to it. Thus, a short circuit of the microwave energy to be coupled to the inner conductor is avoided by the plasma.
  • this glass cylinder 2 a is, galvanically separated from the further coupling structure 3, the central conductor. 4
  • the coupling structure 3 is in the present case, apart from the central conductor 4, formed as described in US 4,049,940 per se.
  • a coaxial energy supply line 3a which is connected in the interior of a coupling space 3b with a capacitive coupling plate 3c, which in some areas closely approaches a coaxial jacket 3d.
  • the coaxial sheath 3d has an axis on which the central conductor 4 runs and thus forms with the central conductor a coaxial RF energy coupling device.
  • the coupling structure 3 further has a coupling slot 5 for impressing the surface wave and a front plate 6.
  • this protective right is incorporated in full for the purpose of disclosure. The arrangement is operated as follows:
  • the coaxial feed line 1 energy is conducted via the coaxial feed line and the capacitive coupling to the gas volume 2 from an HF energy source (not shown), which may be formed in the remaining part of the light source or separately.
  • the capacitive coupling couples energy into the coaxial structure of coaxial sheath 3d and center conductor 4 for energy transfer in a coaxial fundamental mode.
  • the supplied energy forms a surface wave along the central conductor which extends along the central conductor beyond the coupling structure and thus also extends into the region of the oblong glass bulb outside the actual coupling structure, ie beyond the front plate 6, and the gas volume becomes placed in the plasma state.
  • the coupling takes place without resonance conditions having to be maintained so that pulsed operation is readily possible. Measurements have shown that no significant microwave power is emitted. While the use of a glass bulb has been described above, this is not mandatory. In particular, but not exclusively, the use of suitable ceramics is also suitable for high-pressure lamps. Also, the use of an electrically non-separated inner conductor for high-pressure lamps with ceramic insulators is more suitable.
  • a luminous means and a method for operating a luminous means have been described in which high-frequency waves are coupled into a gas volume for generating and maintaining plasma with only little shading, a small construction is achieved, ensuring broadband transmissivity for high-frequency waves in the component. tet, self-consumption or Leerlaufver ⁇ consumption is very low and the high-frequency wave can be easily transported into the interior of the bulb.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Plasma Technology (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Discharge Lamp (AREA)

Abstract

L'invention concerne un luminaire ayant un volume de gaz et un dispositif coaxial de couplage d'énergie HF destiné à l'exciter à l'aide d'ondes de surface. Selon l'invention, le dispositif coaxial de couplage d'énergie HF (3) comprend un conducteur central (4) passant dans le volume de gaz (2).
EP11822886.5A 2010-12-27 2011-12-22 Luminaire et son procédé de fonctionnement Not-in-force EP2659503B9 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010056028 2010-12-27
DE201110008944 DE102011008944A1 (de) 2011-01-19 2011-01-19 Leuchtmittel und Betriebsverfahren dafür
PCT/DE2011/002167 WO2012095081A1 (fr) 2010-12-27 2011-12-22 Luminaire et son procédé de fonctionnement

Publications (3)

Publication Number Publication Date
EP2659503A1 true EP2659503A1 (fr) 2013-11-06
EP2659503B1 EP2659503B1 (fr) 2016-12-21
EP2659503B9 EP2659503B9 (fr) 2017-06-21

Family

ID=45808028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11822886.5A Not-in-force EP2659503B9 (fr) 2010-12-27 2011-12-22 Luminaire et son procédé de fonctionnement

Country Status (5)

Country Link
US (1) US9589784B2 (fr)
EP (1) EP2659503B9 (fr)
CA (1) CA2822881A1 (fr)
RU (1) RU2604643C2 (fr)
WO (1) WO2012095081A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101770183B1 (ko) * 2014-12-11 2017-09-05 김형석 동축 케이블형 플라즈마 램프 장치

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4792725A (en) * 1985-12-10 1988-12-20 The United States Of America As Represented By The Department Of Energy Instantaneous and efficient surface wave excitation of a low pressure gas or gases
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
GB8829251D0 (en) * 1988-12-15 1989-01-25 Emi Plc Thorn A discharge tube arrangement
JPH10255726A (ja) * 1997-03-06 1998-09-25 New Japan Radio Co Ltd 表面波プラズマ発光装置
JP2000280206A (ja) 1999-03-31 2000-10-10 Zero One Products:Kk 天然木薄板材
RU2236060C1 (ru) * 2002-12-25 2004-09-10 Закрытое акционерное общество Научно-производственный центр "СОЛИТОН-НТТ" Газоразрядный источник ультрафиолетового излучения
RU2236721C1 (ru) * 2003-05-26 2004-09-20 Государственное унитарное предприятие "Всероссийский электротехнический институт им. В.И. Ленина" Сверхвысокочастотный возбудитель безэлектродной газоразрядной лампы
DE10335523B4 (de) 2003-07-31 2009-04-30 Koch, Berthold, Dr.-Ing. Vorrichtung zur Plasmaerregung mit Mikrowellen
JP4761244B2 (ja) * 2005-10-20 2011-08-31 株式会社小糸製作所 放電灯及び光源装置
JP2007220531A (ja) * 2006-02-17 2007-08-30 Koito Mfg Co Ltd 放電灯
DE102009022755A1 (de) 2009-05-26 2010-12-02 Fachhochschule Aachen Hochfrequenzlampe über Impedanztransformation

Also Published As

Publication number Publication date
RU2013135113A (ru) 2015-02-10
US20160172181A1 (en) 2016-06-16
EP2659503B9 (fr) 2017-06-21
RU2604643C2 (ru) 2016-12-10
EP2659503B1 (fr) 2016-12-21
WO2012095081A1 (fr) 2012-07-19
CA2822881A1 (fr) 2012-07-19
US9589784B2 (en) 2017-03-07

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