EP2191494B1 - Lampe à décharge haute pression présentant un revêtement partiel et projecteur de véhicule comprenant cette lampe - Google Patents

Lampe à décharge haute pression présentant un revêtement partiel et projecteur de véhicule comprenant cette lampe Download PDF

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Publication number
EP2191494B1
EP2191494B1 EP08804350A EP08804350A EP2191494B1 EP 2191494 B1 EP2191494 B1 EP 2191494B1 EP 08804350 A EP08804350 A EP 08804350A EP 08804350 A EP08804350 A EP 08804350A EP 2191494 B1 EP2191494 B1 EP 2191494B1
Authority
EP
European Patent Office
Prior art keywords
coating
discharge lamp
pressure discharge
lamp according
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.)
Not-in-force
Application number
EP08804350A
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German (de)
English (en)
Other versions
EP2191494A1 (fr
Inventor
Marc Lünnemann
Oliver Hering
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
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2191494A1 publication Critical patent/EP2191494A1/fr
Application granted granted Critical
Publication of EP2191494B1 publication Critical patent/EP2191494B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01J61/30—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, in particular for a vehicle headlight, having at least one discharge vessel and two electrodes extending into a discharge space of the discharge vessel, between which forms a light-emitting discharge arc during operation of the high-pressure discharge lamp.
  • the invention further relates to a vehicle headlight provided with at least one such high-pressure discharge lamp.
  • Such a high-pressure discharge lamp is, for example, on the Internet domain www.osram.de described under the product designation "XENARC ®".
  • These conventional discharge lamps have a discharge vessel delimiting a discharge space filled with an ionizable filling into which two electrodes are connected, which are connected to supply leads led out of the discharge vessel and generate a gas discharge during operation of the lamp which forms a light-emitting discharge arc ,
  • a high-pressure discharge lamp in which an electrically conductive, light-transmitting layer as at least partial coating is applied to the surface of the discharge vessel.
  • This coating together with the electrodes and possibly with the power supply lines, forms a capacitor, with the glass of the discharge vessel in between and the filling gas in the discharge space forming the dielectric of this capacitor.
  • a dielectrically impeded discharge is produced in the discharge space between the electrodes 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 considerably reduce the ignition voltage required for this purpose.
  • a disadvantage of such high-pressure discharge lamps is that the color temperature and luminance of the discharge arc over the length of the discharge arc is formed unevenly, so that light emitted by the lamp, especially when using such high-pressure discharge lamps in vehicle headlights, can lead to dazzling other road users.
  • so-called hot spots in the discharge space of such lamps which have an extremely high color temperature, lead to dazzling of oncoming vehicles.
  • the invention has for its object to provide a high-pressure discharge lamp and a vehicle headlamp with at least one such high-pressure discharge lamp, in which compared to conventional solutions an improved lighting effect is possible.
  • the inventive coating of the high-pressure discharge lamp in the region of a discharge space-side end portion of at least one electrode is achieved that the lamp color and luminous homogeneous and other road users, for example oncoming motorists no longer or at least less dazzling, since the luminance as well as the color temperature by such a partial coating is changed. Furthermore, by such a partial coating, the geometry of the actual luminous body can be set very accurately. As a result, for example, the reflector geometry of a headlight can be adapted much better to the discharge lamp, so that an improved lighting effect is achieved.
  • the partial coating is formed as the luminance and color temperature of the emitted light degrading coating.
  • the discharge vessel of the lamp is surrounded at least in sections by an outer bulb in a preferred embodiment of the invention.
  • the coating it is possible for the coating to be applied on the outer peripheral surface of the outer bulb and / or on the outer peripheral surface of the discharge vessel.
  • a coating applied to the outer peripheral surface of the outer bulb is thermally less stressed than a coating which is applied to the discharge vessel.
  • the application of the coating on the outer surface of the discharge vessel has the advantage that the coating is protected against mechanical damage and unwanted reactions of the coating can be prevented by means provided in the space of outer bulb and discharge vessel gas filling, in particular an inert gas.
  • the invention is not limited to such lamp types with outer bulb, but the high-pressure discharge lamp can be formed without an outer bulb having applied to the discharge vessel coating.
  • a coating is applied in each case to a coating on the peripheral surface of the outer bulb and / or of the discharge vessel in the region of the discharge-space-side end sections of both electrodes.
  • the coating is applied at least to a circumferential section of the outer bulb and / or of the discharge vessel.
  • the coating extends annularly around the outer bulb and / or the discharge vessel.
  • the coating forms an annular cover of the very bright, white hot spots with high color temperature, so that the light effect of the lamp is color and light homogeneous.
  • the coating is applied to the outer bulb or the discharge vessel such that it encompasses the end portion of the electrode at a distance. It has proven to be particularly advantageous if the coating is applied in each case beginning approximately 0.2 to 1.2 mm, preferably 0.5 mm in front of the discharge space-side end portion of the electrode and extending in the direction of an end portion of the discharge vessel.
  • the coating preferably extends in each case from the discharge space at least to a melting of the electrode in the discharge vessel of the high-pressure discharge lamp.
  • the coating is applied in each case from one end of the electrode starting on the outer bulb or the discharge vessel and extends in the direction of the end portions of the discharge vessel.
  • At least a portion of the radiation emitted in the region of the ends of the electrodes is not detected by the coating, so that a very high luminance is achieved.
  • this is preferably applied in mask or glare technique.
  • a coating according to the invention preferably has at least one absorption filter, an interference filter and / or a combination of such filters.
  • absorption or partial absorption of the light emitted by the discharge arc can be achieved.
  • an interference filter arrangement it is possible in particular to filter light in an undesired wavelength range causing a glare from the emission spectrum of the discharge lamp.
  • the coating is applied to the outer bulb and / or the discharge vessel by means of a vacuum coating method.
  • a coating with a defined layer thickness and high adhesion is achieved. It is advantageous that the vacuum coating process is continuous, ie no intermediate ventilation of the vacuum chamber takes place and thereby no contamination of the coating occur, so that the quality of the coating of the high-pressure discharge lamp is substantially improved.
  • the optical properties of the coating can be easily be adjusted by the material used, the layer geometry and thickness of the layer to achieve the desired improvements in the lighting effect.
  • the coating may consist of one or more materials.
  • the coating is applied in PVD sputtering or CVD technology.
  • PVD sputtering or CVD technology.
  • CVD chemical vapor deposition
  • the uncoated portion of the outer peripheral surface of the outer bulb or of the discharge vessel preferably has a sufficiently high luminance in order to achieve the required illuminance according to ECE standard.
  • the invention will be explained below with reference to a high-pressure discharge lamp, as used for example in vehicle headlights.
  • the high-pressure discharge lamp according to the invention is by no means limited to such lamp types.
  • FIG. 1 shows a schematic representation of a high-pressure discharge lamp 1 with a discharge vessel 2 (burner) made of quartz glass which delimits a discharge space 4 and two diametrically arranged, sealed end sections 6, 8 in which a molybdenum foil 10 is embedded for gas-tight electrical feedthrough.
  • the molybdenum foils 10 are connected at a first narrow side 12 to an outer power supply 14, 16 made of doped molybdenum.
  • an outer power supply 14, 16 made of doped molybdenum.
  • In the discharge space 4 of the discharge vessel 2 protrude two diametrically arranged electrodes 18, 20 of doped tungsten, which are each connected to a second narrow side 22 of the molybdenum foils 10 and between which forms a light-emitting gas discharge during lamp operation.
  • an ionizable filling is included, which consists of high-purity xenon gas and a plurality of metal halides.
  • the discharge vessel 2 is surrounded by an outer bulb 24, which consists of quartz glass, which is provided with ultraviolet radiation absorbing dopants.
  • the high-pressure discharge lamp 1 also has a lamp cap 26, which carries the discharge vessel 2 and the outer bulb 24.
  • the lamp base 26 has a partially cylindrical base housing 28 made of electrically insulating plastic for receiving in a lamp holder, not shown, the lamp side has a mounting portion 30 with a fixing ring 32 for fixing the outer bulb 24 in the base housing 28.
  • the outer power supply 14 of the socket-distal end portion 6 of the discharge vessel 2 is connected via an insulating sleeve 34 surrounded current return 36 with an electrical connection ring 38 of the base 26, while the sockelnahe power supply 16 is connected to an inner contact pin, not shown, of the high-pressure discharge lamp 1.
  • each of the electrodes 18, 20 has a partial coating 44 which modifies the luminance and color temperature of the emitted light.
  • the coatings 44 are each approximately annularly applied to the outer bulb 24 such that they surround the end portions 42 of the electrodes 18, 20 spaced apart and extend to a melting 48 of the electrodes 6, 8 in the discharge vessel 2. Due to the coatings 44 of the high-pressure discharge lamp 1 according to the invention, it is achieved that the lamp appears colorless and luminous more homogeneous and no longer or at least less dazzling to other road users, for example oncoming motorists, since the luminance as well as the color temperature is lowered by such a partial coating 44.
  • the geometry of the actual luminous body can be set very accurately.
  • the reflector geometry a headlamp much better adapted to the discharge lamp 1, so that an improved lighting effect is achieved.
  • the attachment of the coating 44 on the outer peripheral surface 40 of the outer bulb 24 is compared with a coating which is applied to the discharge vessel 2 thermally less burdened.
  • An uncoated portion 46 of the outer peripheral surface 40 of the outer envelope 24 has a sufficiently high luminance to achieve the illuminance required for street illumination by the ECE.
  • the coating 44 is applied to the discharge vessel 2.
  • the application of the coating 44 on the outer peripheral surface of the discharge vessel 2 has the advantage that the coating 44 is protected against mechanical damage and undesirable reactions of the coating can be prevented by means of a gas filling provided in the space between the outer bulb and the discharge vessel, in particular an inert gas filling.
  • the coating 44 may each be applied from one end of the electrodes 18, 20 starting on the outer bulb 24 or the discharge vessel 2 and extending in the direction of the end portions 6, 8 of the discharge vessel 2.
  • the coating 44 has at least one absorption filter, an interference filter and / or a combination of such filters and, in the exemplary embodiment shown, is applied to the outer bulb 24 by means of a vacuum coating method.
  • a vacuum coating method In order to influence the position and geometry of the coating 44 is these applied, for example, in mask or glare technique.
  • a coating with a defined layer thickness and high adhesion is achieved. It is advantageous that the vacuum coating process is continuous, ie no intermediate ventilation of the vacuum chamber takes place and thereby no contamination of the coating occur, so that the quality of the coating of the high-pressure discharge lamp 1 is substantially improved.
  • the optical properties of the coating 44 can be readily adjusted by the material used, the layer geometry and the thickness of the layer to achieve the desired improvements in luminous efficiency.
  • the coating can consist of different materials.
  • the coating can be applied in PVD sputtering or CVD technology.
  • the coating 44 in the illustrated embodiment extends in each case from a distance X of approximately 0.2 to 1.2 mm, preferably 0.5 mm, in front of the discharge-space-side end sections 42 of the electrodes 18 in the region of the discharge space 4 , 20 starting in the direction of the end sections 6, 8 of the discharge vessel 2 (see FIG. 1 ).
  • the coating 44 forms an annular covering of the very bright, white hot spots 52 having a high color temperature occurring in the edge region of the electrodes 18, 20, so that the light effect of the lamp is color and luminous more homogeneous.
  • the arc length L is in the illustrated embodiment of the invention about 5 mm.
  • a central Area 54 of the discharge arc 50 having the width T has at least about 50% of the maximum luminance.
  • a portion 56 of the discharge arc 50 having a width T is characterized by a luminance of at least about 20% of the maximum luminance, wherein a center 58 of the luminance is spaced a distance R from a reference axis 60.
  • the high-pressure discharge lamp 1 according to the invention is not limited to lamps with outer bulb 24, but the high-pressure discharge lamp can be embodied without an outer bulb 24 with coating 44 applied to the discharge vessel 2.
  • the geometry of the coating 44 is not limited to the aforementioned embodiment. In particular, the coating 44 may be applied only to one or more peripheral portions of the outer bulb 24 or the discharge vessel 2.
  • a high-pressure discharge lamp 1 in particular for a vehicle headlight, with at least one discharge vessel 2 and two extending into a discharge space 4 of the discharge vessel 2 electrodes 18, 20, between which forms a light-emitting discharge arc 50 during operation of the high-pressure discharge lamp 1, wherein on a Peripheral surface 40 of the lamp in the region of a discharge-space-side end portion 42 of at least one of the electrodes 18, 20 a the luminance and color temperature of the emitted light changing partial coating 44 is applied.
  • a vehicle headlamp with at least one such high-pressure discharge lamp.

Landscapes

  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)

Claims (15)

  1. Lampe à décharge haute pression avec au moins un récipient de décharge (2) et deux électrodes (18, 20) qui s'étendent à l'intérieur d'un espace de décharge (4) du récipient de décharge (2) et entre lesquelles se forme, pendant le fonctionnement de la lampe à décharge haute pression (1), un arc de décharge (50) émettant de la lumière, un revêtement (44) partiel qui modifie la luminance et la température de la couleur de la lumière émise étant appliqué sur une surface de pourtour (40) de la lampe dans la zone d'une partie terminale (42) d'au moins l'une des électrodes (18, 20) côté espace de décharge, caractérisée en ce que le revêtement (44) est appliqué à partir d'environ 0,2 à 1,2 mm avant la partie terminale (42) de l'électrode (18, 20) côté espace de décharge et s'étend en direction d'une partie terminale (6, 8) du récipient de décharge (2).
  2. Lampe à décharge haute pression selon la revendication 1, le revêtement (44) réduisant la luminance et la température de la couleur de la lumière émise.
  3. Lampe à décharge haute pression selon la revendication 1 ou 2, le récipient de décharge (2) étant entouré, au moins en partie, d'une ampoule extérieure (24).
  4. Lampe à décharge haute pression selon la revendication 3, le revêtement (44) étant appliqué sur la surface de pourtour, et plus particulièrement sur la surface de pourtour extérieur (40) de l'ampoule extérieure (24).
  5. Lampe à décharge haute pression selon l'une des revendications 1 à 3, le revêtement (44) étant appliqué sur une surface de pourtour extérieur du récipient de décharge (2).
  6. Lampe à décharge haute pression selon l'une des revendications précédentes, respectivement un revêtement (44) étant appliqué dans la zone des parties terminales (42) des deux électrodes (18, 20) côté espace de décharge.
  7. Lampe à décharge haute pression selon l'une des revendications précédentes, l'au moins un revêtement (44) s'étendant au moins autour d'une partie de pourtour de l'ampoule extérieure (24) resp. du récipient de décharge (2).
  8. Lampe à décharge haute pression selon l'une des revendications précédentes, l'au moins un revêtement (44) s'étendant de manière approximativement annulaire autour de l'ampoule extérieure (24) resp. du récipient de décharge (2).
  9. Lampe à décharge haute pression selon l'une des revendications précédentes, l'au moins un revêtement (44) entourant à distance la partie terminale (42) de l'électrode (18, 20).
  10. Lampe à décharge haute pression selon l'une des revendications précédentes, le revêtement (44) s'étendant de l'espace de décharge (4) au moins jusqu'à un scellement (48) de l'électrode (18, 20).
  11. Lampe à décharge haute pression selon l'une des revendications précédentes, le revêtement (44) comportant au moins un filtre d'absorption, un filtre d'interférence et/ou une combinaison de tels filtres.
  12. Lampe à décharge haute pression selon l'une des revendications précédentes, le revêtement (44) étant appliqué au moyen d'un procédé de revêtement sous vide.
  13. Lampe à décharge haute pression selon l'une des revendications précédentes, le revêtement (44) étant appliqué selon une technique de pulvérisation par dépôt physique en phase vapeur ou une technique de dépôt chimique en phase vapeur.
  14. Lampe à décharge haute pression selon l'une des revendications précédentes, le revêtement étant appliqué selon une technique de masque ou d'écran.
  15. Phare de véhicule avec au moins une lampe à décharge haute pression (1) selon l'une des revendications précédentes.
EP08804350A 2007-09-28 2008-09-18 Lampe à décharge haute pression présentant un revêtement partiel et projecteur de véhicule comprenant cette lampe Not-in-force EP2191494B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007046559A DE102007046559A1 (de) 2007-09-28 2007-09-28 Hochdruckentladungslampe mit partieller Beschichtung sowie Fahrzeugscheinwerfer mit einer derartigen Lampe
PCT/EP2008/062406 WO2009043726A1 (fr) 2007-09-28 2008-09-18 Lampe à décharge haute pression présentant un revêtement partiel et projecteur de véhicule comprenant cette lampe

Publications (2)

Publication Number Publication Date
EP2191494A1 EP2191494A1 (fr) 2010-06-02
EP2191494B1 true EP2191494B1 (fr) 2011-08-10

Family

ID=40276017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804350A Not-in-force EP2191494B1 (fr) 2007-09-28 2008-09-18 Lampe à décharge haute pression présentant un revêtement partiel et projecteur de véhicule comprenant cette lampe

Country Status (7)

Country Link
US (1) US20100194264A1 (fr)
EP (1) EP2191494B1 (fr)
JP (1) JP5101700B2 (fr)
CN (1) CN101809707A (fr)
AT (1) ATE520146T1 (fr)
DE (1) DE102007046559A1 (fr)
WO (1) WO2009043726A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5343768B2 (ja) * 2009-09-01 2013-11-13 ウシオ電機株式会社 高圧放電ランプ
DE102011076212A1 (de) * 2011-05-20 2012-11-22 Osram Ag Entladungslampe
US9607821B2 (en) * 2011-09-13 2017-03-28 Osram Sylvania Inc. Modified spectrum incandescent lamp

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6087156U (ja) * 1983-11-16 1985-06-15 東芝ライテック株式会社 小型メタルハライドランプ
JP2974193B2 (ja) * 1992-05-15 1999-11-08 松下電子工業株式会社 自動車前照灯用メタルハライドランプ
US5708328A (en) * 1992-06-03 1998-01-13 General Electric Company Universal burn metal halide lamp
DE682356T1 (de) * 1994-05-12 1996-05-02 Iwasaki Electric Co Ltd Metallhalogenid Lampe.
JPH1196974A (ja) * 1997-09-18 1999-04-09 Iwasaki Electric Co Ltd 透明保温膜付メタルハライドランプ
JP3603723B2 (ja) * 1999-03-26 2004-12-22 松下電工株式会社 メタルハライドランプ及び放電灯点灯装置
EP1168417A1 (fr) * 2000-06-26 2002-01-02 General Electric Company Lampe à incandescence avec un revêtement réfléchissant des rayons infrarouges et un revêtement terminal entierement réfléchissant
DE10204691C1 (de) 2002-02-06 2003-04-24 Philips Corp Intellectual Pty Quecksilberfreie Hochdruckgasentladungslampe und Beleuchtungseinheit mit einer solchen Hochdruckgasentladungslampe
DE10222954A1 (de) * 2002-05-24 2003-12-04 Philips Intellectual Property Hochdruckgasentladungslampe
DE10247983A1 (de) 2002-07-23 2004-02-05 Philips Intellectual Property & Standards Gmbh Lampe
JP2004220867A (ja) * 2003-01-10 2004-08-05 Koito Mfg Co Ltd 放電バルブ
DE102004043636A1 (de) 2004-09-07 2006-03-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe
JP2006134656A (ja) * 2004-11-04 2006-05-25 Harison Toshiba Lighting Corp メタルハライドランプ
JP2007026921A (ja) * 2005-07-19 2007-02-01 Koito Mfg Co Ltd 自動車用放電バルブ

Also Published As

Publication number Publication date
JP2010541142A (ja) 2010-12-24
EP2191494A1 (fr) 2010-06-02
JP5101700B2 (ja) 2012-12-19
US20100194264A1 (en) 2010-08-05
WO2009043726A1 (fr) 2009-04-09
DE102007046559A1 (de) 2009-04-02
CN101809707A (zh) 2010-08-18
ATE520146T1 (de) 2011-08-15

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