EP2673796B1 - Lampe à décharge à haute intensité dotée d'un dispositif d'aide à l'amorçage - Google Patents

Lampe à décharge à haute intensité dotée d'un dispositif d'aide à l'amorçage Download PDF

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Publication number
EP2673796B1
EP2673796B1 EP11741435.9A EP11741435A EP2673796B1 EP 2673796 B1 EP2673796 B1 EP 2673796B1 EP 11741435 A EP11741435 A EP 11741435A EP 2673796 B1 EP2673796 B1 EP 2673796B1
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EP
European Patent Office
Prior art keywords
electrode
container
enhancer
pressure discharge
discharge lamp
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.)
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Application number
EP11741435.9A
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German (de)
English (en)
Other versions
EP2673796A1 (fr
Inventor
Johannes Buttstaedt
Uwe Fidler
Stefan Lichtenberg
Georg Rosenbauer
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
Osram GmbH
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Filing date
Publication date
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Publication of EP2673796A1 publication Critical patent/EP2673796A1/fr
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Publication of EP2673796B1 publication Critical patent/EP2673796B1/fr
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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
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • 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
    • H01J61/34—Double-wall vessels or containers
    • 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
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of claim 1.
  • Such lamps are in particular high-pressure discharge lamps for general lighting.
  • WO 2010/131574 shows embodiments of a geometry variation of the inner electrode.
  • a further metallic component is introduced into the UV enhancer, which promotes the charge transport of the dielectrically impeded discharge. This is costly.
  • the document JP 2011-009090 A discloses a high pressure discharge lamp with a UV enhancer as an ignition aid.
  • the UV enhancer has a UV-transparent can-like quartz glass container which is accommodated in an outer bulb of the high-pressure discharge lamp.
  • the quartz glass container serves as a discharge vessel.
  • the container encloses with its inner wall a cavity which is filled with a noble gas which can radiate W radiation.
  • an inner electrode is arranged in the cavity, which has a bend or a kink.
  • the inner electrode is housed in the cavity so that the bend or kink comes close to the inner wall of the container.
  • an external electrode is mounted on the outer wall of the container.
  • JP 2008-135194 A also discloses a high-pressure discharge lamp of the aforementioned type.
  • the object of the present invention is to provide a high-pressure discharge lamp whose ignition is reliable.
  • UV radiation is used for the reliable ignition of krypton85-free high-pressure discharge lamps. This is often provided by UV enhancers. Reliable ignition of all high-pressure discharge lamps requires UV radiation in the wavelength range ⁇ 280 nm. A lower threshold of about 160 nm results from the transmission range of the discharge vessel (quartz or ceramic). To solve this problem are mainly mercury-containing UV enhancer with radiation in o.g. Range, in particular at a wavelength of 254 nm have been used. To reduce the mercury content in high-pressure discharge lamps, UV enhancers without mercury with corresponding UV emission are necessary.
  • the vessel of the UV enhancer may consist of quartz or another UV-transparent glass, especially toughened glass. Also solutions with a UV enhancer, in which the discharge vessel made of ceramic, are possible, provided that the discharge vessel is translucent in the UV.
  • a molybdenum foil is provided which ensures the gas-tight passage through the quartz glass and acts as a power supply. At the same time, it is the inner electrode of the UV enhancer.
  • the power supply through the glass can also be done with a wire or pencil.
  • appropriate techniques are used as well known from the construction of ceramic discharge vessels.
  • the ignition voltage of the UV enhancer is directly dependent on the distance between the inner electrode and the inner wall of the discharge vessel. This results in different solutions for different basic technologies.
  • the part of the molybdenum foil, which is arranged inside the discharge vessel, is partially or completely bent. Thus, the distance to the inner wall is kept low.
  • the molybdenum foil can be clamped by a spring action between opposite inner walls of the normally cylindrical discharge vessel. This reduces the distance to the inner wall to the conceivable minimum.
  • a high probability of a discharge in the UV enhancer is obtained in the area where the highest electric field strengths occur at the internal electrode. This is effectively achieved where there is the least distance between the external electrode and the inner electrode of the UV enhancer. For a high UV intensity of the UV enhancer, it is desirable to provide as many places as possible, at which there is a very small distance.
  • Another possibility is to reduce the distance of the inner molybdenum foil to a pump tip of the discharge vessel made of quartz glass.
  • High field strengths are generally favored by film edges that are as sharp as possible.
  • the molybdenum foil used is doped, in particular with yttrium oxide, in particular with 0.2 to 2 wt .-%.
  • Further advantageous oxides are cerium oxide and lanthanum oxide. These mentioned oxides can also be used in a mixture.
  • filling conventional fillings can be used, in particular noble gases such as argon, Penninggemische such as argon other noble gas or mixtures of noble gases and halogens or halogen compounds such as dibromomethane in particular.
  • noble gases such as argon, Penninggemische such as argon other noble gas or mixtures of noble gases and halogens or halogen compounds such as dibromomethane in particular.
  • fluorine compounds can preferably be used only in a ceramic UV enhancer or in a coated glass flask.
  • the gaseous halogen compounds are mixed with the corresponding noble gases. In some cases, combinations of noble gases can also be mixed in here.
  • the pressure of the filling gas in the UV enhancer is in the range 1 mbar to 1 bar.
  • the intensity of the generated UV radiation typically increases with the filling pressure, so that an upper limit for the pressure results from the ignition voltage of the UV enhancers, which must be designed for the ignition and operating devices of the lamp.
  • UV enhancers with two electrodes
  • other components such as a capacitor ( US 4,987,344 ) or even more complex controls ( US 4,721,888 ) is possible to limit the current through the UV enhancer.
  • UV enhancers have prevailed which have an inner and an external electrode and use a dielectrically impeded discharge. These UV enhancers are relatively inexpensive.
  • FIG. 1 a metal halide lamp 1 is shown schematically ( Figure la), in which a discharge vessel 2 of PCA is contained in an outer bulb 3 made of quartz glass, which is closed with a base 4.
  • the discharge vessel 2 has two ends, sit on the capillaries 5.
  • the discharge vessel 2 is provided with a metal halide filling, as known per se. It is supported in the outer bulb 3 by means of a frame 6, which has a short frame wire 7 and a long hanger wire 8.
  • a UV enhancer 10 On a first capillary 5 sits a UV enhancer 10, which is connected to the short frame wire 7 via a feed line 11.
  • the counter electrode to it also called external electrode, is a foil strip 9, which extends from the hanger wire 8 to the UV enhancer 10 and this surrounds a semicircle.
  • a wire or a sufficient proximity of the stirrup wire to the UV enhancer 10 for the function of the counter electrode is sufficient. Preference is given to the smallest possible distance as well as the largest possible contact area, which includes not only a tip, but at least a quarter circle to a semicircle, as in FIG. 1b shown.
  • FIG. 2a shows in detail a container or discharge vessel 12 of the UV enhancer 10.
  • the container 12 is in principle a can or cup-like tube made of quartz glass with side wall 13, bottom part 14 and dome 15.
  • the container can also be made of hard glass.
  • Essential to the invention is that the container 12 is a filling of halogen gas, or halogen gas combined with noble gas, in particular a Penninggemisch or argon having.
  • the container 12 has a tubular cavity 17, in which from one side, the bottom part 14, an electrode 18 protrudes.
  • the electrode is sealed in a pinch 16 associated with the bottom part 14.
  • the length of the electrode 18 in the container 12 is considerably longer than the length L of the cavity 17. It is preferably at least 20% longer than L.
  • the electrode 18 according to FIG. 2a bent in the cavity so that it rests resiliently on two opposite side walls. The electrode thus has a bend near the bend.
  • the cavity 17 must be large enough to accommodate the single electrode 18, the UV enhancer operating on the dielectrically impeded discharge principle.
  • the electrode 18 is a pin or preferably a foil, usually made of W or Mo. It has attached a contact wire 11 at the outer end 19, see FIG. 1 , The electrode 18 is inserted into the cavity 17. Then, a filling gas is filled into the cavity 17 and the cavity, in particular with a pinch 16, closed.
  • FIG. 2b an embodiment is shown in which the electrode has a kink, which sits in the vicinity of the dome 15.
  • FIG. 2c an embodiment is shown, in which the electrode 18 is cut in the axis and thereby forms an axial trunk 19 and two branches 20.
  • the two branches 20 are bent to two sides.
  • this shape can also be generated in other ways, for example, by attaching to a trunk 19 two separate branches or more branches.
  • FIG. 2d an embodiment is shown in which the electrode 18 is cut in the axis and thereby forms an axial stem 19 and two branches 20.
  • the two branches 20 are bent to two sides.
  • this shape can also be generated in other ways, for example, by attaching to a trunk 19 two separate branches or more branches.
  • the container 12 is provided with a thickened dome 25.
  • the sheet-like electrode 18 abuts with its tip 26 on the inner wall of the thickened dome.
  • This embodiment is made by compressing the silica glass toward the pinch 16 during the process of fusing the pump tip forming a dome. Due to a reduced pressure compared with the atmospheric pressure, the doughy glass of the pump tip is drawn into the interior of the UV enhancer during melting.
  • the boundary conditions for the bulbous concerns of the Mo film to the cylindrical wall is the smallest possible thickness of the Mo film.
  • Mo films are used with thicknesses ⁇ 20 .mu.m, in particular 5 to 20 .mu.m, which then have a low rigidity and can easily bulge out through the overlying pump tip.
  • the film top edge 27 is embedded in the dome 25, which is formed by melting.
  • the length of the film is preferably settled in the range of 115 to 130% of L.
  • FIG. 2g An embodiment which does not form part of the invention is disclosed in Figure 2g shown.
  • the sheet-like electrode 18 is bent several times. It can also be compressed here in the process of melting the thickened dome 25, so that there are several break points 30 at which the electrode 18 approaches the inner wall of the container.
  • a concrete embodiment of the filling is a UV enhancer, in which krypton with a 0.5% by volume admixture of chlorine gas Cl 2 is used as filling gas.
  • the UV enhancer shows strong UV radiation of the excimer line KrCl * at a wavelength of 222 nm.
  • the cold filling pressure is in the range 500-700 mbar.
  • each work well for interacting with external electrodes.
  • external electrodes are advantageously used, which surround the UV enhancer in the middle of the cylindrical part of the container 12 and annular in particular, have a planar extension.
  • a foil tape 32 or a flat-pressed wire is used. See the illustration in FIG. 2h ,
  • a high probability for the formation of a discharge is obtained in an area where the highest possible electric field strengths at the inner electrode 18 result. This can be achieved by the smallest possible distance between the external electrode 32 and the internal electrode 18. For the highest possible intensity of the UV radiation generated by the UV enhancer, it is advantageous to provide as many places as possible at which such a condition is met. Therefore, as many points of contact of the inner electrode 18 to the side wall 13, if possible in the amount of the external electrode 32, desirable.
  • FIG. 3a shows the embodiments of the FIGS. 2a and 2b in plan view.
  • the width B of the film is preferably 40 to 80% of the inner diameter of the container 12.
  • FIG. 3b shows the embodiments of the FIGS. 2c and 2d in plan view.
  • the width B of the film is preferably 40 to 80% of the inner diameter of the container 12.
  • FIGS. 2a and 2b One obtains four points at which the film-like electrode 18 of the side wall 13 is particularly close or even touched. According to the embodiments according to FIGS. 2c and 2d these are two points.
  • the electrode used is a film of molybdenum, which is doped in particular with substances which lower the work function of the electron work.
  • a film of molybdenum which is doped in particular with substances which lower the work function of the electron work.
  • an oxide of yttrium, cerium or lanthanum is especially suitable for this purpose.
  • Specific embodiments are a doping with 0.5 to 0.7 wt .-% Y2O3, mixed oxides Ce2O3 / Y2O3 or even mixtures Ce2O3 / Y2O3 / La2O3 can be used.
  • the Mo foil can be used to lower the ignition voltage using metallic alloys which contain, in particular, at least one element from the group Ru, Ti, Ta, Nb, or with ceramic layers which are selected, in particular, from the group consisting of nitrides, oxides, silicides. or with other readily ionizable materials, in particular tungsten material with very high potassium content, etc., are coated.
  • metallic alloys which contain, in particular, at least one element from the group Ru, Ti, Ta, Nb, or with ceramic layers which are selected, in particular, from the group consisting of nitrides, oxides, silicides. or with other readily ionizable materials, in particular tungsten material with very high potassium content, etc., are coated.
  • an embodiment of the invention can lower the ignition voltage to values typically down to 1 kV.
  • halide-containing filling gases in particular noble gases with halogen, prevent blackening over the lifetime. They also increase the proportion of excimer radiation. Specific examples are argon with C12 or Br2 or J2. but it is also pure argon as a filling gas.
  • a halide-containing additive such as dibromomethane (DBM) can be used.
  • DBM dibromomethane
  • a concrete example is argon with an addition of 2000 to 10000 ppm DBM.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (4)

  1. Lampe à décharge à haute pression (1) dotée d'un dispositif d'aide à l'amorçage, d'une enceinte de décharge (2) qui est logée dans une ampoule extérieure (3), où un amplificateur d'UV (10), en tant que dispositif d'aide à l'amorçage, est logé dans l'ampoule extérieure (3), où l'amplificateur d'UV (10) présente un récipient (12), en forme de boîte, transparent aux UV et comprenant une paroi intérieure et un côté frontal et un axe longitudinal, où le récipient (12) entoure, par sa paroi intérieure, une cavité (17) qui peut être remplie d'un gaz qui peut émettre un rayonnement d'UV, où une électrode recourbée intérieure, qui est une électrode (18) en forme de feuille à effet ressort et présente au moins une courbure ou un coude, est logée dans la cavité (17), de manière telle qu'une courbure ou un coude soit le plus près possible de la paroi intérieure du récipient (12), et où une électrode externe (9) est placée extérieurement à proximité du récipient (12),
    caractérisée en ce que la longueur de la feuille dépasse la longueur de la cavité (17), où une extrémité libre de l'électrode (18) est soit recourbée par rapport à l'axe longitudinal, soit fixée dans une surface frontale du récipient (12).
  2. Lampe à décharge à haute pression selon la revendication 1, dotée de ladite extrémité libre recourbée de l'électrode (18), caractérisée en outre en ce que l'électrode (18) en forme de feuille est, au niveau de son extrémité libre, subdivisée en plusieurs branches (20) qui sont à nouveau recourbées.
  3. Lampe à décharge à haute pression selon la revendication 1, caractérisée en ce que l'électrode externe (9) est en appui sur le récipient (12) à hauteur au moins d'une courbure ou d'un coude.
  4. Lampe à décharge à haute pression selon la revendication 1, caractérisée en ce que le récipient (12) est cylindrique.
EP11741435.9A 2011-07-28 2011-07-28 Lampe à décharge à haute intensité dotée d'un dispositif d'aide à l'amorçage Active EP2673796B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/063053 WO2013013727A1 (fr) 2011-07-28 2011-07-28 Lampe à décharge à haute intensité dotée d'un dispositif d'aide à l'amorçage

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Publication Number Publication Date
EP2673796A1 EP2673796A1 (fr) 2013-12-18
EP2673796B1 true EP2673796B1 (fr) 2015-03-04

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Country Link
US (2) US9053921B2 (fr)
EP (1) EP2673796B1 (fr)
CN (2) CN103493176B (fr)
HU (2) HUE025158T2 (fr)
WO (2) WO2013013727A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117410158A (zh) 2017-05-29 2024-01-16 伯恩斯公司 玻璃密封的气体放电管
US11348784B2 (en) 2019-08-12 2022-05-31 Beijing E-Town Semiconductor Technology Co., Ltd Enhanced ignition in inductively coupled plasmas for workpiece processing

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EP1104582B1 (fr) 1999-06-16 2006-11-02 Koninklijke Philips Electronics N.V. Lampe de decharge a haute pression
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DE202010011029U1 (de) 2010-08-09 2010-10-21 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe mit Zündhilfe
DE102010064040A1 (de) * 2010-12-23 2012-06-28 Osram Ag Hochdruckentladungslampe mit Zündhilfe
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DE202011103945U1 (de) 2011-08-01 2011-11-03 Osram Ag Hochdruckentladungslampe mit Zündhilfe

Also Published As

Publication number Publication date
CN103733302A (zh) 2014-04-16
WO2013014243A1 (fr) 2013-01-31
HUE025158T2 (en) 2016-02-29
HUE026108T2 (en) 2016-05-30
CN103493176B (zh) 2016-08-17
US9053921B2 (en) 2015-06-09
US20140239803A1 (en) 2014-08-28
CN103733302B (zh) 2018-02-27
CN103493176A (zh) 2014-01-01
US10269551B2 (en) 2019-04-23
EP2673796A1 (fr) 2013-12-18
WO2013013727A1 (fr) 2013-01-31
US20140117846A1 (en) 2014-05-01

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