EP1984936A1 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression

Info

Publication number
EP1984936A1
EP1984936A1 EP07726322A EP07726322A EP1984936A1 EP 1984936 A1 EP1984936 A1 EP 1984936A1 EP 07726322 A EP07726322 A EP 07726322A EP 07726322 A EP07726322 A EP 07726322A EP 1984936 A1 EP1984936 A1 EP 1984936A1
Authority
EP
European Patent Office
Prior art keywords
discharge
coating
discharge vessel
vessel
pressure discharge
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
EP07726322A
Other languages
German (de)
English (en)
Other versions
EP1984936B1 (fr
Inventor
Dirk Grundmann
Matthias Lau
Andreas Naujoks
Michael Bönigk
Melanie Roth
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
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 Osram GmbH filed Critical Osram GmbH
Publication of EP1984936A1 publication Critical patent/EP1984936A1/fr
Application granted granted Critical
Publication of EP1984936B1 publication Critical patent/EP1984936B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H01J61/54—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
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings

Definitions

  • the invention relates to a high-pressure discharge lamp according to the preamble of claim 1.
  • European Patent EP 0 991 107 B1 describes on page 4, in lines 12 to 26 of column 6, a single-capped high-pressure discharge lamp for a motor vehicle headlamp which has a discharge vessel surrounded by an outer glass bulb, the outer bulb having a translucent one , Electrically conductive layer is provided which extends over the entire discharge space of the lamp. This layer is connected to the circuit-internal ground reference potential of the operating device of the high-pressure discharge lamp in order to improve the electromagnetic compatibility of the lamp.
  • the high-pressure discharge lamp according to the invention has a discharge vessel sealed on two sides, an ionizable filling enclosed in the discharge space of the discharge vessel and electrodes for generating a gas discharge extending into the discharge space, wherein the discharge vessel has an electrically conductive coating which is designed as a starting aid and at least in the border region between the discharge space Discharge space and a first sealed end of the discharge vessel is arranged.
  • This coating forms with that of the first sealed end protruding and projecting into the discharge space first electrode of the high-pressure discharge lamp, a capacitor, wherein the intermediate quartz glass of the discharge vessel and the filling gas in the discharge space form the dielectric of this capacitor.
  • a dielectrically impeded discharge is generated in the discharge space between the first electrode and the coating.
  • This dielectrically impeded discharge generates a sufficient number of free charge carriers in the discharge space in order to enable the electrical breakdown between the two electrodes of the high-pressure discharge lamp or to significantly reduce the ignition voltage required for this purpose.
  • the invention is therefore particularly suitable for mercury-free metal halide high-pressure discharge lamps, which have an increased ignition voltage due to the lack of mercury.
  • the coating designed as an ignition aid is additionally arranged in the boundary region between the discharge space and the second sealed end of the discharge vessel.
  • FIG. 4 the mean breakdown voltage of the discharge path in the high-pressure discharge lamp is shown for a plurality of high-pressure discharge lamps without an auxiliary ignition coating and for high-pressure discharge lamps with an auxiliary ignition coating having five different geometries.
  • the evaluation according to FIG. 4 was based in each case on a plurality of high-pressure discharge lamps for each of the five coating geometries, over which an average value for the breakdown voltage was formed.
  • the average breakdown voltage for high-pressure discharge lamps without Zündosbe Anlagen is about 28.1 kV, while in high-pressure discharge lamps with a Be layering (bar 2 in Figure 4), in the boundary region between the discharge space and the first sealed end the discharge vessel and in addition also in the boundary region between the discharge space and the second sealed end of the discharge vessel, the average breakdown voltage is reduced to about 23.4 kV.
  • the coating extends in the boundary region or in the boundary regions over the entire circumference of the discharge vessel.
  • the boundary region between the discharge space and the sealed first end of the discharge vessel or the boundary regions between the discharge space and the sealed ends of the discharge vessel are preferably each formed by an annular groove surrounding the discharge vessel. This results in a particularly small distance between the Zündosbezelung and the respective electrode of the high-pressure discharge lamp and thus a particularly good capacitive coupling between the coating and the corresponding electrode.
  • the coating is additionally mounted on a surface portion of the first sealed end of the discharge vessel.
  • the required high voltage for igniting the gas discharge in the high-pressure discharge lamp can be further reduced.
  • the average breakdown voltage for high-intensity discharge lamps with an ignition auxiliary coating which extends over a section of the surface of the first sealed end and the two boundary regions between the discharge space and the sealed ends is only approximately 20.6 kV.
  • the Zündinsbe slaughterung is also extended to a surface portion of the discharge space enclosing part of the discharge vessel, so that the Zündosbe harshung preferably on a surface portion of the first sealed end and the discharge space enclosing part of the discharge vessel and on the extending two boundary regions between the discharge space and the sealed ends of the discharge vessel.
  • the Zündinsbe- layering forms a strip which extends on the surface of the first sealed end and the aforementioned, the discharge space enclosing part of the discharge vessel.
  • the embodiment belonging to the bar 4 of FIG. 4 with the lowest mean breakdown voltage differs from the embodiment belonging to the bar 5 of FIG. 4 by a coating which is formed in the region of the discharge space as a comparatively narrow strip on the discharge vessel surface, while FIG to the beam 5 of Figure 4 associated embodiment, the coating is formed in the region of the discharge vessel as a wide strip.
  • high-pressure discharge lamps with an auxiliary ignition coating which extends over both sealed ends of the discharge vessel and is mirror-symmetric with respect to the plane arranged through the discharge vessel center and perpendicular to the longitudinal axis of the discharge vessel have a slightly higher average breakdown voltage than the two preferred unbalanced Zündinsbe harshung, the only first sealed end but not extending to the second sealed end of the discharge vessel.
  • the mean breakdown voltage for high-pressure discharge lamps is about 20 kV with the aforementioned symmetrical ignition assist coating, which is arranged on the two abovementioned boundary regions, the surfaces of both sealed ends and a surface section of the discharge chamber enclosing the discharge space.
  • the abovementioned first sealed end of the discharge vessel is preferably that end whose power supply and electrode are subjected to the high-voltage pulses required to ignite the gas discharge in the high-pressure discharge lamp.
  • the above-mentioned dielectrically impeded discharge is generated between the electrode or power supply protruding from the first sealed end and the ignition assist coating.
  • the invention is advantageously applicable to high-pressure discharge lamps which are provided for operation in a horizontal position, with electrodes arranged in a horizontal plane, as for example in the case of metal halide high-pressure discharge lamps for vehicle headlights.
  • the one with the auxiliary ignition layer provided surface portion of the discharge space enclosing part of the discharge vessel disposed below the electrodes.
  • the coating reflects a portion of the infrared radiation generated by the discharge back into the discharge space and thus ensures selective heating of the cooler regions of the discharge vessel below the electrodes in which the metal halides used for generating light are collected.
  • the efficiency of the lamp can be increased without also heating the hot regions of the discharge vessel lying above the electrodes.
  • the application of the coating only on the colder underside of the discharge vessel reduces the thermal load on the coating, so that correspondingly lower demands can be placed on the thermal resistance of the coating materials.
  • the Zündosbe slaughterung the high-pressure discharge lamps according to the invention is preferably designed to be translucent, in order to ensure the lowest possible light absorption and high light output.
  • the power supply lead-out from the first sealed end of the discharge vessel is connected to at least one molybdenum foil embedded in the first sealed end and the at least one molybdenum foil is oriented such that one of its two sides faces the coating disposed on the surface portion of the first sealed end.
  • FIG. 1 shows a side view of the discharge vessel of the high-pressure discharge lamp shown in FIG. 3 according to the preferred exemplary embodiment
  • Figure 2 is a side view of the discharge vessel of Figure 3 shown
  • High-pressure discharge lamp according to the preferred embodiment in a relation to the Figure 1 by an angle of 90 degrees to the
  • FIG. 3 is a side view of the high pressure discharge lamp according to the preferred embodiment of the invention.
  • FIG. 4 shows a comparison of the mean breakdown voltage for high-pressure discharge lamps without auxiliary ignition coating and with differently configured auxiliary starting coatings
  • the preferred exemplary embodiment of the invention shown schematically in FIG. 3 is a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of approximately 35 watts.
  • This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 10 made of quartz glass with a volume of 24 mm, in which an ionizable filling, consisting of xenon and halides of the metals sodium, scandium, zinc and indium, gas-tight enclosed.
  • the inner contour of the discharge vessel 10 is circular-cylindrical and its outer contour is ellipsoidal.
  • the inner diameter of the discharge space 106 is 2.6 mm and its outer diameter is 6.3 mm.
  • the two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molybdenum foil sealing 103, 104.
  • the electrodes 11, 12 are made of tungsten. Their thickness or their diameter is 0.30 mm. The distance between the electrodes 11, 12 is 4.2 mm.
  • the electrodes 11, 12 are each connected via one of the molybdenum foil melts 103, 104 and via the socket-remote power supply wire 13 and the current return 17 or via the base-side current supply.
  • Guide wire 14 electrically conductively connected to an electrical connection of the lamp base 15 consisting essentially of plastic.
  • the discharge vessel 10 is enveloped by a glass outer bulb 16.
  • the outer bulb 16 has an extension 161 anchored in the base 15.
  • the discharge vessel 10 has a tubular extension 105 made of quartz glass on the base side, in which the base-side current supply 14 extends.
  • the current return 17 facing surface region of the discharge vessel 10 is provided with a transparent, electrically conductive coating 107.
  • This coating 107 extends in the longitudinal direction of the lamp over the entire length of the discharge space 106 and over a part, about 50 percent, of the length of the socket-side, sealed end 102 of the discharge vessel 10.
  • the coating 107 is mounted on the outside of the discharge vessel 10 and For example, it extends over about 5 percent to 50 percent of the circumference of the discharge vessel 10. It is formed in the region of the discharge space 106 and in the region of the base-side sealed end 102 as a strip.
  • the coating 107 is formed in each case as a ring which surrounds the discharge vessel 10.
  • the boundary regions are formed by an annular, the discharge vessel 10 encircling groove 108, 109, a so-called curl, in which or in which the discharge vessel 10 has the smallest diameter and thus a particularly small distance between the Zündosbe Anlagenung 107 and the corresponding electrode 11 or 12 consists.
  • the coating 107 consists of doped tin oxide, for example of fluorine-doped or antimony-doped tin oxide.
  • the layer thickness of the auxiliary ignition coating 107 is preferably selected so that the resistance of the Zündinsbe Anlagenung 107 measured between any two, arranged at a distance of 1 cm on the Zündinsbe harshung 107 points in the order of magnitude of about 10 4 ohms.
  • the average breakdown voltage of the discharge path of the high The discharge discharge lamp 107 having the auxiliary ignition coating 107 shown in FIGS. 1 to 3 is approximately 19.3 kV, corresponding to the bar 5 in FIG. 4.
  • the space between the outer bulb 16 and the discharge vessel 10 is preferably filled with an inert gas having a cold filling pressure in the range of 5 kPa to 150 kPa to which a small amount of oxygen is mixed.
  • the amount of oxygen is adjusted so that, on the one hand, diffusion of oxygen from the tin oxide layer 107 is prevented and, on the other hand, no oxidation of the dopants in the tin oxide coating 107 is caused.
  • the inert gas is preferably nitrogen or a noble gas or a noble gas mixture or a nitrogen noble gas mixture.
  • This high-pressure discharge lamp is operated in a horizontal position, that is, with arranged in a horizontal plane electrodes 11, 12, wherein the lamp is oriented such that the current return path 17 extends below the discharge vessel 10 and the outer bulb 16.
  • the high-voltage pulses required to ignite the gas discharge in the high-pressure discharge lamp are supplied to the base-side electrode 12 via the power supply 14, since the socket-side power supply 14 is completely surrounded by the lamp vessels 10, 16 and the base 15 and thus provides excellent electrical insulation of the high voltage Parts of the high pressure discharge lamp is guaranteed.
  • the aforementioned high-voltage pulses are generated, for example, by means of a pulse ignition device whose components can be arranged in the lamp base 15.
  • the invention is not limited to the embodiment explained in more detail above.
  • the width of the strip-like portion of the coating 107 can be reduced so that the coating 107 in the region of the discharge space 106 has a significantly smaller width than the portion of the coating arranged on the base-side end 102 107.
  • This allows the Breakthrough voltage of the discharge path of the high pressure discharge lamp according to the bar 4 of Figure 4 are lowered to about 18.8 kV.
  • the Zündange s coating 107 may extend in the region of the socket-side sealed end 102 or or and in the region of the discharge chamber 106 over the entire circumference of the discharge vessel 10.
  • the discharge vessel 10 shown in FIGS. 1 and 2 can also be mounted in the lamp base 15 with the auxiliary ignition coating 107 in such a way that the sealed end 102 provided with the auxiliary ignition coating 107 has the end remote from the base and the uncoated sealed end 101 of the discharge vessel 10 socket-side end of the high-pressure discharge lamp is formed.
  • the Zündosbe Anlagenung 107 may be arranged instead of on the socket-side end 102 on the socket remote end 101 of the discharge vessel 10 of the high-pressure discharge lamp.
  • the Zündinsbe slaughterung 107 may also extend to both sealed ends 101, 102 of the discharge vessel 10.
  • the ignition voltage is preferably polarized in such a way that the electrode 11 or plugged into the coated end 101 and 102, respectively 12 is connected to the positive pole of the ignition voltage or in the case of unipolar, negative ignition voltage pulses to ground.
  • the coating 107 can also consist of another light-transmitting, electrically conductive material.
  • it may be formed as a so-called ITO layer, that is, an indium tin oxide layer.
  • the ITO layer may comprise, for example, 90 weight percent indium oxide and 10 weight percent tin oxide.
  • the coating 107 may for example be electrically coupled to an ignition device by suitable means in order to apply to the high-pressure discharge lamp via the coating 107 voltage pulses for igniting the gas discharge in the discharge space 106.
  • the invention may also be applied to the conventional mercury-containing metal halide high-intensity discharge lamps in order to achieve the advantages described above.
  • a pulse ignition device it is also possible, instead of a pulse ignition device, to use an ignition device which generates the high voltage required for igniting the gas discharge by means of the resonance peaking method.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

L'invention concerne une lampe à décharge à haute pression avec une ampoule de décharge (10) scellée des deux côtés, une charge ionisable confinée dans l'espace de décharge (106) de l'ampoule de décharge (10) et des électrodes (11, 12) s'étendant dans l'espace de décharge (106) et servant à générer une décharge de gaz, l'ampoule de décharge (10) comportant un revêtement (107) électriquement conducteur qui est conçu comme assistance à l'allumage et est disposé au moins dans la zone limitrophe (109) entre l'espace de décharge (106) et une première extrémité (102) étanche de l'ampoule de décharge (10).
EP07726322.6A 2006-02-15 2007-02-06 Lampe à décharge à haute pression Expired - Fee Related EP1984936B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006007218A DE102006007218A1 (de) 2006-02-15 2006-02-15 Hochdruckentladungslampe
PCT/EP2007/051129 WO2007093525A1 (fr) 2006-02-15 2007-02-06 Lampe à décharge à haute pression

Publications (2)

Publication Number Publication Date
EP1984936A1 true EP1984936A1 (fr) 2008-10-29
EP1984936B1 EP1984936B1 (fr) 2014-04-02

Family

ID=37908010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07726322.6A Expired - Fee Related EP1984936B1 (fr) 2006-02-15 2007-02-06 Lampe à décharge à haute pression

Country Status (7)

Country Link
US (1) US8013508B2 (fr)
EP (1) EP1984936B1 (fr)
JP (1) JP2009527082A (fr)
CN (1) CN101385118A (fr)
CA (1) CA2641122A1 (fr)
DE (1) DE102006007218A1 (fr)
WO (1) WO2007093525A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7772749B2 (en) 2007-05-01 2010-08-10 General Electric Company Wavelength filtering coating for high temperature lamps
WO2009030265A1 (fr) * 2007-08-29 2009-03-12 Osram Gesellschaft mit beschränkter Haftung Lampe à dispositif auxiliaire d'amorçage appliqué directement
EP2405464A4 (fr) 2009-03-06 2014-09-17 Harison Toshiba Lighting Corp Lampe à décharge pour véhicule, dispositif de lampe à décharge pour véhicule, dispositif de lampe à décharge pour véhicule du type combiné à un circuit d'éclairage, et circuit d'éclairage
JP5418886B2 (ja) * 2009-04-23 2014-02-19 東芝ライテック株式会社 放電ランプおよびその製造方法
JP5493694B2 (ja) * 2009-06-25 2014-05-14 東芝ライテック株式会社 放電ランプ
DE102009047861A1 (de) * 2009-09-30 2011-03-31 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe mit kapazitiver Zündhilfe
DE102010001209A1 (de) 2010-01-26 2011-07-28 Osram Gesellschaft mit beschränkter Haftung, 81543 Hochdruckentladungslampe
JP2011228013A (ja) * 2010-04-15 2011-11-10 Koito Mfg Co Ltd 車輌用放電灯
US8766518B2 (en) 2011-07-08 2014-07-01 General Electric Company High intensity discharge lamp with ignition aid
US8659225B2 (en) 2011-10-18 2014-02-25 General Electric Company High intensity discharge lamp with crown and foil ignition aid
DE202011103862U1 (de) 2011-07-29 2011-10-24 Osram Ag Hochdruckentladungslampe

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US7772749B2 (en) * 2007-05-01 2010-08-10 General Electric Company Wavelength filtering coating for high temperature lamps

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Also Published As

Publication number Publication date
US20090009084A1 (en) 2009-01-08
EP1984936B1 (fr) 2014-04-02
JP2009527082A (ja) 2009-07-23
DE102006007218A1 (de) 2007-08-16
US8013508B2 (en) 2011-09-06
WO2007093525A1 (fr) 2007-08-23
CA2641122A1 (fr) 2007-08-23
CN101385118A (zh) 2009-03-11

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