EP2246874B1 - Lampe à plasma - Google Patents

Lampe à plasma Download PDF

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Publication number
EP2246874B1
EP2246874B1 EP10004268A EP10004268A EP2246874B1 EP 2246874 B1 EP2246874 B1 EP 2246874B1 EP 10004268 A EP10004268 A EP 10004268A EP 10004268 A EP10004268 A EP 10004268A EP 2246874 B1 EP2246874 B1 EP 2246874B1
Authority
EP
European Patent Office
Prior art keywords
plasma
microwave
reflector
light
lamp according
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.)
Not-in-force
Application number
EP10004268A
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German (de)
English (en)
Other versions
EP2246874A1 (fr
Inventor
Lars Brandt
Margareta Hamel
Harry Wagener
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.)
Auer Lighting GmbH
Original Assignee
Auer Lighting GmbH
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 Auer Lighting GmbH filed Critical Auer Lighting GmbH
Publication of EP2246874A1 publication Critical patent/EP2246874A1/fr
Application granted granted Critical
Publication of EP2246874B1 publication Critical patent/EP2246874B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04Lamps 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
    • H01J65/042Lamps 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
    • H01J65/044Lamps 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 invention relates to a plasma lamp with a lamp envelope containing a suitable for plasma formation with a microwave excitation radiation material, with a supply line for supplying the microwave excitation radiation to the lamp envelope and with a lamp envelope at least partially surrounding the reflector for the alignment of the plasma in the lamp envelope emitted light, wherein the lamp envelope is arranged within a microwave resonator so that in the region of the lamp envelope, a high microwave field strength is achieved and wherein the microwave resonator has metallic walls.
  • Such a plasma lamp is through EP 1 432 012 A2 known.
  • the microwave excitation radiation is generated by a magnetron as a microwave source and passed through a waveguide in a cylindrical microwave resonator, in the longitudinal axis of the center of the lamp envelope is arranged.
  • This is preferably filled with an inert gas which is ionized by the microwave energy to a plasma and thereby emits light.
  • the light can emerge from the microwave resonator through an upper, translucent wall section which is formed by a grid-like metallic structure in the form of a network.
  • the microwave resonator with the lamp envelope is located within a conventionally funnel-shaped reflector having a circular cross section, wherein the cylindrical microwave resonator is arranged concentrically to the circular cross section of the reflector.
  • the known plasma lamps are usually filled with sulfur and therefore known as sulfur plasma lamps.
  • the system of the plasma lamp enables a high luminous efficacy.
  • a disadvantage of the known plasma lamps, however, is that the wire cylinder, which surrounds the lamp bulb laterally and in the emission direction, shields part of the light and that the metal reflector arranged outside the microwave resonator must have a considerable size.
  • US 2003/0057842 A1 discloses a plasma lamp in which a microwave resonator is formed by a housing, in the resonator chamber of which the microwave energy generated by a microwave generator is introduced via a coaxial waveguide.
  • a lamp bulb filled with a suitable gas is arranged, which is rotatable with a motor.
  • a boundary wall of the resonator housing has an opening into which a reflector surrounding the lamp bulb is inserted, which protrudes out of the resonator housing with a substantial part of the reflector body.
  • the protruding from the resonator part of the reflector is surrounded with a hat-shaped lattice structure to prevent the release of microwave energy into the environment.
  • the present invention is therefore the object of a plasma lamp of the type mentioned in such a way that a smaller design with an optimized light output is possible.
  • a plasma lamp of the type mentioned is characterized in that the microwave resonator is formed by a metal plate forming a bottom, a cylindrical shell wall made of metal and a bottom, shielding and translucent structure in the form of a cover that the reflector is disposed within the microwave resonator and that the microwave resonator is tuned with the reflector to an optimal energy input into the lamp envelope.
  • the reflector is thus within the microwave resonator. This is made possible by the fact that the reflector and the resonator are matched to each other and the energy input is optimized in the plasma lamp.
  • the reflector is not formed as a metallic reflector but consists of a permeable to microwaves body, preferably with a microwave-permeable, but reflective for light coating.
  • This arrangement has the advantage that an interaction with the microwave irradiation does not occur.
  • Such a coating is preferably a non-metallic interference coating.
  • the interference coating is preferably designed as a dichroic mirror and thus has a high reflectivity for the visible light, while the microwave excitation radiation and any heat radiation through the coating pass virtually unattenuated.
  • the reflector is preferably made of a microwaveable material, namely glass, ceramic, glass ceramic or suitable plastics.
  • the coating is preferably an interference coating with coating materials which are transparent to microwaves, in particular oxides, nitrides or the like.
  • the use of the non-metallic interference coating permits an increase in the degree of reflection compared with the metal reflectors (in particular aluminum reflectors) used hitherto.
  • the metal reflectors in particular aluminum reflectors
  • the conventional aluminum layers have a reflectance of about 90%
  • the reflectance of the interference coatings is based on TiO 2 / SiO 2 interlayer packages, typically in the range of 94 to 97%.
  • a further increase in the efficiency of the plasma lamp according to the invention can be achieved in that it can be set up for operation with a microwave frequency of> 5 GHz.
  • a microwave frequency of> 5 GHz Preferably, a 5.8 GHz magnetron is used here.
  • This microwave excitation frequency is clearly higher than the excitation frequencies used in conventional sulfur plasma lamps. The higher frequencies allow smaller dimensions of the microwave components, so that the plasma lamp according to the invention can therefore also be created compared to conventional plasma lamps with smaller dimensions.
  • the plasma lamp according to the invention allows the use of all suitable materials that can be stimulated by a microwave excitation radiation to the light output. These include the known fillings with sulfur fractions, but also other possible fillings, for example with dysprosium iodide, mercury iodide, etc., as well as combinations of these materials.
  • the shielding electrically conductive structure of the cover is a light-transmitting, electrically conductive coating of a light-transmissive substrate.
  • the electrically conductive coating may be made so thin that it is sufficiently conductive to enclose the microwave field in the microwave resonator, but is transparent or at least translucent to the visible light.
  • it is possible to translate on a substrate apply lattice-like coating that shields the microwave field in the manner of a Faraday cage, the light passage through the spaces between the metallic grid lines allows.
  • laminate-shaped is therefore understood as meaning any pattern-regular or irregular-that ensures sufficient coherent conductivity for the shielding of the microwave field and, on the other hand, leaves sufficient gaps through which the light generated in the lamp bulb and directed by the reflector Light can escape.
  • the translucent substrate may be provided with an electrically conductive coating of a transparent oxide instead of a metal coating.
  • electrically conductive coatings which are transparent at the same time in the visible range, are generally known to the person skilled in the art. They are z. B. used in the thermal insulation of windows or touch screens.
  • the coatings consist of oxides which are doped with another oxide and thus obtain semiconductor-like properties.
  • the best known is indium tin oxide (ITO), in which indium oxide is doped with a proportion of about 5 to 10% of tin oxide.
  • ITO indium tin oxide
  • the doping gives the otherwise not particularly conductive indium oxide a conductivity which, given a sufficient thickness of the ITO coating, is capable of achieving sufficient electrical conductivity for the reflection of microwaves.
  • This type of coating has an effect such as a thin metal layer due to its electrical conductivity.
  • the lamp bulb is arranged displaceably in a center axis of the reflector, so that the geometry of the lamp bulb is variable relative to the reflector, so the alignment and focusing of the light is adjustable.
  • the lamp bulb is inserted laterally into the reflector instead of below, wherein a rod-shaped projection, with which the lamp bulb is fixed in a lamp holder, is led out through a lateral opening through the reflector.
  • the piston with the light-emitting filling gas must be located at a suitable location in the reflector, as in the earlier embodiment.
  • the plasma lamp according to the invention allows a light conversion of 120 lumens / W or more.
  • a conventionally available magnetron with a power of 800 W is used as the microwave source, a luminous flux of more than 100,000 lumens can be achieved.
  • the plasma lamp according to the invention is operated with lamp bulb diameters of about 30-35 mm.
  • the filling pressure of the filling material in the lamp bulb is to be adjusted as a function of the filling material used, the size of the lamp bulb and / or the magnetron's electrical power.
  • the fillings usable for the plasma lamp according to the invention are not limited. It can be used the conventional gas mixtures of argon and sulfur, but are also possible gas mixtures with other materials, such.
  • an inert gas preferably inert gas, which absorbs the microwave energy and the absorbed energy to the other gas components, such as sulfur or its molecules emits, causing them to be excited and the fall back to the low-energy state, the photons submit.
  • This task can also be fulfilled by inert gases, preferably noble gases.
  • the plasma lamp according to the invention differs from conventional discharge lamps, in particular the CDM lamps (Ceramic Discharge Metal).
  • CDM lamps Ceramic Discharge Metal
  • a color separation between red and green occurs through the interaction of the contained metal salts (rare earth metals such as scandium) with the hot bulb.
  • metal salts rare earth metals such as scandium
  • Such a color separation does not occur in the plasma lamps according to the invention, since they usually do not contain metal salts.
  • solids, especially solid sulfur in the flask
  • the majority of the sulfur in a sulfur plasma lamp
  • the high temperature of the sulfur is achieved by energy transfer from the strongly excited by the microwaves argon atoms or other strongly excited atoms or molecules.
  • the bulb of the plasma lamp can be permanently mounted. Alternatively, it is possible to rotate the piston about its longitudinal axis during operation of the lamp in order to achieve a homogenization of the light excitation by the microwaves. As a result, there will be no preferential sites in the plasma lamp where sulfur can primarily precipitate. Accordingly, there is no color asymmetry of the light emission as in the conventional CDM lamps.
  • the light emitted by the plasma lamp according to the invention has a comparatively low UV content compared with conventional discharge lamps, in which considerable quantities of UV radiation are produced, in particular, by the excitation of mercury atoms in the gas composition.
  • a sulfur-argon mixture as in the plasma lamp according to the invention
  • the emission spectrum contains a relatively small proportion in the UV range over the visible range. Below 350 nm, virtually no UV radiation is released at all.
  • the plasma lamp according to the invention enables the use of very small lamp envelopes whose diameter can thus be ⁇ 35 mm, preferably ⁇ 20 mm and particularly preferably up to ⁇ 10 mm.
  • a change in the filling pressure or a change in the gas composition may be useful.
  • the shape of the piston used in this case may be spherical in a conventional manner.
  • This design is particularly advantageous in the case of an elliptical reflector, in which the light rays, which originate in the vicinity of the optical axis, can regularly be better guided into a small aperture for geometrical reasons than light rays which are further away from the optical axis to have.
  • the plasma lamp according to the invention has the advantage that they are well dimmable compared to conventional discharge lamps.
  • the plasma lamp according to the invention is infinitely dimmable without a significant deterioration of the emission spectrum.
  • the color rendering value Ra (or CRI) does not noticeably deteriorate with a low applied electric power, so that the lamp can continue to be operated with good color rendering at low power without having to run expensive and thermally strong dimmer disks into the beam path, such as this is the case with conventional stage headlights.
  • the conventional dimming also does not lead to energy savings as it is achieved with the invention, well-dimmable plasma lamp.
  • the plasma lamp according to the invention can be used particularly well as street lighting, since the night shutdown commonly used in traffic and in the security of the citizens is quite disadvantageous, so that a dimming of such a plasma lamp according to the invention allows both energy savings and avoids the disadvantages of the complete night shutdown. Since the color properties of the radiated light do not change in the dimming practically, a high visibility of unlighted road users, especially pedestrians, even with reduced light intensity is maintained.
  • the plasma lamp according to the invention can be turned on and off very quickly in contrast to conventional discharge lamps.
  • the overall life of the lamp is not significantly reduced by frequent switching on and off since the lamp does not contain any electrodes which could be affected by the on / off process.
  • the plasma lamp according to the invention is therefore very well suited for use in the field of obstacle lighting, z. B. as a beacon on wind turbines, towers, factory chimneys, etc.
  • the lamp according to the invention can be operated immediately with full light intensity, if it is only turned off for a short time. With a longer turn-off time, the piston cools down. Sulfur filling causes the sulfur to solidify. From the cold state, it takes less than 20 seconds until the full light intensity is reached again.
  • the plasma lamp according to the invention is particularly suitable for stage lighting, for architectural lighting (facades, large squares, parking lots, stadiums, construction sites, etc.), for a digital cinema projection, for horticultural enterprises to simulate daylight and for lighting large halls, department stores, shopping malls etc.
  • the plasma lamp according to the invention can also be used as a central light source by emitting radiated light with a preferably elliptical Reflector is imaged on a small aperture in which there is a side of a glass fiber bundle from which emanates a plurality of glass fibers, which can be distributed in a plurality of individual individual light sources.
  • FIG. 1 is a spherical lamp bulb 1 made of a suitable glass, quartz glass o. The like.
  • a rod-shaped projection 2 with which the lamp bulb 1 is fixed in a lamp holder 3.
  • the projection 2 protrudes through a metal plate 4, which forms a bottom of a cylindrical microwave resonator 5.
  • the metal plate 4 and a cylindrical jacket wall 6 of the microwave resonator 5 are made of metal, while a bottom 4 of the opposite, the microwave resonator 5 final cover 7 consists of a suitable glass and is provided with an electrically conductive coating to the environment against to shield leakage of the microwaves from the microwave resonator 5.
  • microwaves generated by a microwave generator 8 are introduced laterally through a waveguide 9 through a slot in the microwave resonator 5.
  • the microwave generator 8 is supplied electrically by a supply unit 10.
  • the microwave resonator 5 Within the microwave resonator 5 according to the invention is a reflector 11 which surrounds the lamp envelope 1 concentrically with respect to the vertical axis.
  • the reflector 11 preferably consists of a suitable non-metallic body which is permeable to microwaves and does not disturb the microwave field in the microwave resonator 5.
  • the glass body 11 is provided with a non-metallic coating that transmits the microwaves, the however, light emitted from the lamp bulb 1 is reflected.
  • an interference coating in question which is formed in a conventional manner of alternating layer packages, for example, TiO 2 and SiO 2 .
  • Such interference coatings can be formed as a cold light mirror coating, so that a high reflectivity for the visible light is given while microwave radiation and possibly existing UV and heat radiation components are transmitted.
  • the reflector is rotationally symmetrical to a central axis 12, a same rotational symmetry about the center axis 12 is also obtained for the lamp bulb 1, which in the in FIG. 1 illustrated embodiment is spherical.
  • the lamp bulb can also have other shapes, such as oval, elliptical o. ⁇ .
  • the piston shape is chosen so that the microwave optimally coupled to the filling gas to convert the highest possible gas content of the filling in the plasma state.
  • In the center axis 12 of the lamp envelope 1 may be arranged translationally displaceable, so that the spatial arrangement of the lamp bulb 1 to the reflector 11 may change, whereby the alignment and focusing of the light beam can be changed.
  • the metal plate forming the bottom of the microwave resonator 5 has interruptions through which a ventilator 13 can introduce cooling air into the microwave resonator to cool the lamp envelope 1, which may become very hot during operation.
  • the air flow can be introduced by a fan or by compressed air into the microwave resonator 5.
  • the lamp bulb 1 is mounted laterally, so that the rod-shaped projection penetrates the reflector 11 laterally and is fastened laterally by the microwave resonator 5 in the lamp holder 3.
  • the waveguide 9, to which the microwave generator 8 is coupled is arranged directly on the bottom of the microwave resonator 5 forming metal plate 4, so that a coupling of the microwave energy from the metal plate 4th in the direction of the longitudinal axis 12 of the microwave resonator 5, ie also directly into the interior of the reflector 11.
  • the microwaves can be coupled via a waveguide at other positions in the resonator 5.
  • the reflector 11 consists of a metallic base body or has a metallic coating.
  • the lamp bulb 1 is rotatably mounted in the lamp holder 3 in a preferred embodiment in order to achieve an improved uniformity of the excitation of the gas mixture in the lamp bulb 1.
  • the rotation can be dispensed with if the intensity of the microwave field can be adjusted so that a sufficiently high and uniform microwave field strength is achieved in the region of the lamp bulb 1.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (12)

  1. Lampe à plasma avec une ampoule de lampe (1), qui contient un matériau adapté à la formation de plasma par une radiation d'excitation micro-onde, avec un conducteur d'alimentation (9) pour l'amenée de la radiation d'excitation micro-onde à l'ampoule de lampe (1) et avec un réflecteur (11) entourant l'ampoule de lampe (1) au moins partiellement pour l'orientation de la lumière émise par le plasma dans l'ampoule de lampe (1),
    où l'ampoule de lampe (1) est agencée à l'intérieur d'un résonateur micro-onde (5) de façon à atteindre une haute intensité de champ micro-onde dans la région de l'ampoule de lampe (1),
    et où le résonateur micro-onde (5) présente des parois métalliques (6, 4, 7),
    caractérisée en ce que le résonateur micro-onde (5) est réalisé par une plaque métallique (4) formant un sol, un cache cylindrique (6) en métal et une structure de protection translucide sous la forme d'une plaque de couverture (7) électriquement conductrice, située en vis-à-vis du sol,
    en ce que le réflecteur (11) est agencé à l'intérieur du résonateur micro-onde (5) et
    en ce que le résonateur micro-onde (5) est accordé avec le réflecteur (11) pour une entrée optimale de la lumière dans l'ampoule de lampe (1).
  2. Lampe à plasma selon la revendication 1, caractérisée en ce que le réflecteur (11) est composé d'un corps de masse transparent aux micro-ondes.
  3. Lampe à plasma selon l'une des revendications 1 ou 2, caractérisée en ce que le réflecteur (11) est muni d'un revêtement transparent aux micro-ondes et réfléchissant pour la lumière.
  4. Lampe à plasma selon la revendication 3, caractérisée en ce que le réflecteur (11) présente un revêtement d'interférence non métallique en tant que revêtement réfléchissant.
  5. Lampe à plasma selon la revendication 4, caractérisée en ce que le revêtement d'interférence est réalisé sous la forme d'un revêtement à lumière froide.
  6. Lampe à plasma selon l'une des revendications 1 à 5, caractérisée en ce qu'elle est conçue pour un fonctionnement avec une fréquence de micro-ondes de plus de 5 GHz.
  7. Lampe à plasma selon l'une des revendications 1 à 6, caractérisée en ce que la structure de protection électriquement conductrice est une enduction translucide électriquement conductrice d'un substrat translucide.
  8. Lampe à plasma selon l'une des revendications 1 à 6, caractérisée en ce que la structure de protection électriquement conductrice est une enduction électriquement conductrice en réseau sur un substrat translucide.
  9. Lampe à plasma selon l'une des revendications 1 à 6, caractérisée en ce que la structure de protection électriquement conductrice est un grillage métallique formant réseau.
  10. Lampe à plasma selon l'une des revendications 1 à 9, caractérisée par un diamètre maximal de l'ampoule de lampe (1) perpendiculairement à un axe médian (12) de moins de 35 mm.
  11. Lampe à plasma selon la revendication 10, caractérisée en ce que le diamètre est de moins de 20 mm.
  12. Lampe à plasma selon la revendication 11, caractérisée en ce que le diamètre est de moins de 10 mm.
EP10004268A 2009-04-28 2010-04-22 Lampe à plasma Not-in-force EP2246874B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009018840A DE102009018840A1 (de) 2009-04-28 2009-04-28 Plasmalampe

Publications (2)

Publication Number Publication Date
EP2246874A1 EP2246874A1 (fr) 2010-11-03
EP2246874B1 true EP2246874B1 (fr) 2013-02-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10004268A Not-in-force EP2246874B1 (fr) 2009-04-28 2010-04-22 Lampe à plasma

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US (1) US20100283390A1 (fr)
EP (1) EP2246874B1 (fr)
DE (1) DE102009018840A1 (fr)

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MX2014008213A (es) 2012-01-05 2014-11-25 Bright Light Systems Inc Sistemas y metodos para proporcionar iluminacion de alto montaje.
DE102012004080A1 (de) * 2012-02-28 2013-08-29 Holger Behrendt Plasma - Heisluftgerät zum Energie sparenden Betreiben eines Heisluftofens
CN108401709A (zh) * 2018-05-08 2018-08-17 清华四川能源互联网研究院 园艺补光装置及系统

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Publication number Publication date
DE102009018840A1 (de) 2010-11-25
EP2246874A1 (fr) 2010-11-03
US20100283390A1 (en) 2010-11-11

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