EP1817790B1 - Lampe a decharge haute pression - Google Patents

Lampe a decharge haute pression Download PDF

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Publication number
EP1817790B1
EP1817790B1 EP05817115A EP05817115A EP1817790B1 EP 1817790 B1 EP1817790 B1 EP 1817790B1 EP 05817115 A EP05817115 A EP 05817115A EP 05817115 A EP05817115 A EP 05817115A EP 1817790 B1 EP1817790 B1 EP 1817790B1
Authority
EP
European Patent Office
Prior art keywords
electrode
filament
discharge vessel
molybdenum foil
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.)
Not-in-force
Application number
EP05817115A
Other languages
German (de)
English (en)
Other versions
EP1817790A1 (fr
Inventor
Dirk Grundmann
Andreas Naujoks
Conrad Schimke
Frank Werner
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 EP1817790A1 publication Critical patent/EP1817790A1/fr
Application granted granted Critical
Publication of EP1817790B1 publication Critical patent/EP1817790B1/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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • 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 patent claim 1.
  • Such a high-pressure discharge lamp is for example in the EP-A 0 858 098 disclosed.
  • This document describes a metal halide high-pressure discharge lamp for a motor vehicle headlight with a discharge vessel made of quartz glass, which has two ends provided with a molybdenum foil seal, and two electrodes which are each connected to one of the molybdenum foil seals and project into the interior of the discharge vessel.
  • a section of the respective electrode, which is arranged in the region of the molybdenum foil seal end of the lamp vessel, outside the molybdenum foil seal, is enclosed by a helix in order to avoid cracks in the quartz glass of the discharge vessel.
  • the pitch of the helix is less than 600 percent and preferably even less than 300 percent.
  • the inner diameter of the helix is at least as large as the electrode diameter and smaller than 1.5 times the electrode diameter.
  • the disadvantage here is that due to the helix between the quartz glass and the electrode cavities may arise, can penetrate into the filling substances from the discharge space. This may damage the molybdenum foil seal.
  • the DE 198 12 298 discloses a high pressure metal halide discharge lamp for a motor vehicle headlamp having a quartz glass discharge vessel having two ends provided with a molybdenum foil seal, and two electrodes respectively connected to one of the molybdenum foil seals and projecting into the interior of the discharge vessel.
  • the electrodes are each surrounded by a helix, wherein the helix in the front, the discharge space facing region has a narrow winding density and is arranged at a distance from the electrode and in the rear, the molybdenum foil seal facing region has a lighter winding density and fits tightly against the electrode.
  • the disadvantage here is the complex production process for the power supply.
  • the US 6,121,729 discloses a high pressure metal halide discharge lamp with electrodes sheathed by a helix, the helix consisting of a high temperature melting gaseous contaminant material and having a slope of 100 to 500 percent.
  • the high-discharge discharge lamp according to the invention has a quartz glass discharge vessel having at least one end provided with a molybdenum foil seal, and at least one electrode connected to the molybdenum foil seal and projecting into the interior of the discharge vessel, wherein a helix having a pitch of greater than or equal to 600 percent is provided, which surrounds a portion of the electrode which is arranged in the region of the molybdenum foil seal provided with the end of the lamp vessel, outside the Mölybdänfblienabdichtung.
  • the softened quartz glass can penetrate between adjacent turns of the coil and wet the surface of the electrode. Because of its relatively large pitch, the helix also has a low heat capacity, so that the quartz glass cools more slowly when flowing around the helix and thus a good seal is achieved.
  • the first and last turns of the helix are wound more tightly than the interposed helix section. It has been found that thereby the desired effect of the helix is not affected.
  • the wire diameter or the wire thickness of the helical wire is advantageously less than 100 micrometers in order not to significantly increase the diameter of the power supply in the region of the electrode section surrounded by the helix.
  • the wire diameter of the helical wire is tuned to the electrode diameter in the range of 0.25 millimeters to 0.4 millimeters, and preferably 0.30 millimeters to 0.35 millimeters, as commonly used in mercury-free metal halide high pressure discharge lamps for automotive headlamps become.
  • the electrodes of this lamp type are designed as pin electrodes.
  • the invention is particularly well suited for high pressure discharge lamps having a comparatively small discharge vessel volume of at most 30 mm 3 , the ionizable filling of which contains metal halides and xenon, and the relatively thick electrodes having a diameter in the range of 0.25 mm to 0.4 mm, such as the above-mentioned, mercury-free metal halide high-pressure discharge lamps for motor vehicle headlights.
  • FIG. 2 shows a sealed by a molybdenum foil seal end 11 of a two-sided sealed discharge vessel 1 of a high pressure discharge lamp for a motor vehicle headlamp according to the preferred embodiment of the invention, including the power supply, which is passed through the closed end 11 of the discharge vessel 1.
  • the lamp is in particular a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of 35 watts.
  • an ionizable filling is arranged, which consists of xenon and the halides of the metals sodium, scandium, zinc and indium.
  • the volume of the discharge vessel is 0.24 mm 3 .
  • the power supply has a molybdenum foil 2 embedded in the gas-tight manner in the closed end 11 of the discharge vessel 1.
  • the molybdenum foil 2 has a length of 6.5 mm, a width of 2 mm and a thickness of 25 ⁇ m.
  • the end facing away from the interior 10 of the discharge vessel 1 of the molybdenum foil 2 is welded to a molybdenum wire 3, which protrudes from the sealed end 11 of the discharge vessel 1.
  • the interior 10 of the discharge vessel 1 facing the end of the molybdenum foil 2 is welded to a rod-shaped, consisting of tungsten electrode 4, which projects into the discharge space 10.
  • the length of the electrode 4 is 7.5 mm and its thickness or its diameter is 0.30 mm.
  • the overlap between the electrode 4 and the molybdenum foil 2 is 1.30 mm ⁇ 0.15 mm.
  • a coil 5 is arranged centrally, so that their distance from the two ends of the electrode 4 is 2.25 mm in each case.
  • the inner diameter of the coil 5 corresponds to the diameter or the thickness of the electrode 4.
  • the coil 5 extends according to the preferred embodiment of the invention, as in FIG. 1 shown schematically, only over the arranged in the closed end 11 of the discharge vessel 1 portion of the electrode 4, which does not overlap with the molybdenum foil 2.
  • the distance of the helix 5 to the molybdenum foil 2 is 0.95 mm. However, the helix 5 can also protrude into the discharge space 10. This does not affect their effect.
  • the other, not shown, closed end of the discharge vessel 1 is formed identical to the end 11. In particular, it also has an electrode as in FIG. 1 or 3 shown. The distance of the protruding into the interior 10 of the discharge vessel 1 ends of the two electrodes is 4.2 mm. The two electrodes are opposite each other, arranged in the longitudinal axis of the discharge vessel 1.
  • FIG. 1 the electrode 4 and the coil 5 of the end 11 of the discharge vessel 1 are shown enlarged. Apart from the first turn 51 and the last turn 52 of the coil 5, the distance L between two adjacent turns is 340 ⁇ m.
  • the high-pressure discharge lamp according to the preferred embodiment further has an outer bulb, which encloses the discharge vessel 1 in the region of the discharge space 10, and a. Lamp base. These details are for example in the EP 1 465 237 A2 described and illustrated.
  • the inner diameter of the helix 5 can also be greater than the diameter of the electrode 4. Good results are also achieved with a helix 5 whose inner diameter is 0.33 mm and which is arranged on an electrode 4 with a diameter of 0.30 mm and is identical in the other dimensions with the helix 5 of the embodiment.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (4)

  1. Lampe à décharge à haute pression comprenant une enceinte (1) de décharge en verre au quartz, qui a au moins une extrémité (11) munie d'une étanchéité (2) par ruban de molybdène et au moins un électrode (4) qui est reliée à l'étanchéité (2) par ruban de molybdène et qui pénètre à l'intérieur (10) de l'enceinte (1) de décharge, un filament (5) étant prévu qui entoure un tronçon de l'électrode (4) disposé dans la partie de l'extrémité (11) de l'enceinte (1) de décharge munie de l'étanchéité (2) par ruban de molybdène, à l'extérieur de l'étanchéité (2) par ruban de molybdène,
    caractérisée en ce que le pas S du filament (5) est supérieur ou égal à 600 %, le pas S se calculant à partir de la distance L entre deux spires voisines du filament (5) et du diamètre D du fil du filament suivant la formule S=(L+D)/D et en ce que la première et la dernière spires du filament (5) sont enroulées d'une manière plus étroite que la partie du filament (5) se trouvant entre elles.
  2. Lampe à décharge à haute pression suivant la revendication 1, caractérisée en ce que le diamètre du fil du filament (5) est plus petit que 100 microns.
  3. Lampe à décharge à haute pression suivant la revendication 1 ou 2, caractérisée en ce que le tronçon de la au moins une électrode (4), qui est entouré du filament (5), est cylindrique et a un diamètre de l'ordre de plus de 0,25 millimètre et de moins de 0,4 millimètre, de préférence dans l'intervalle de 0,30 millimètre à 0,35 millimètre.
  4. Lampe à décharge à haute pression suivant l'une ou plusieurs des revendications 1 à 3, caractérisée en ce que le volume de l'enceinte (1) de décharge est inférieur ou égal à 30mm3 et l'atmosphère ionisable disposée à l'intérieur (10) de l'enceinte de décharge contient des halogénures métalliques et du xénon.
EP05817115A 2004-11-30 2005-11-18 Lampe a decharge haute pression Not-in-force EP1817790B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004057906A DE102004057906A1 (de) 2004-11-30 2004-11-30 Hochdruckentladungslampe
PCT/DE2005/002072 WO2006058513A1 (fr) 2004-11-30 2005-11-18 Lampe a decharge haute pression

Publications (2)

Publication Number Publication Date
EP1817790A1 EP1817790A1 (fr) 2007-08-15
EP1817790B1 true EP1817790B1 (fr) 2009-04-08

Family

ID=35636666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05817115A Not-in-force EP1817790B1 (fr) 2004-11-30 2005-11-18 Lampe a decharge haute pression

Country Status (8)

Country Link
US (1) US7705538B2 (fr)
EP (1) EP1817790B1 (fr)
JP (1) JP4646257B2 (fr)
CN (1) CN100573807C (fr)
AT (1) ATE428182T1 (fr)
CA (1) CA2588555A1 (fr)
DE (2) DE102004057906A1 (fr)
WO (1) WO2006058513A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101416274B (zh) * 2006-04-05 2010-11-17 皇家飞利浦电子股份有限公司 具有带有裂纹引发装置的电极棒的高压气体放电灯
JP4837605B2 (ja) * 2006-11-01 2011-12-14 ハリソン東芝ライティング株式会社 メタルハライドランプ
DE102008003907A1 (de) 2008-01-11 2009-07-16 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe
DE102008051825A1 (de) * 2008-10-15 2010-04-22 Osram Gesellschaft mit beschränkter Haftung Elektrode für eine Entladungslampe und Entladungslampe sowie Verfahren zur Herstellung einer Elektrode
DE102009011525A1 (de) 2009-03-03 2010-09-09 Osram Gesellschaft mit beschränkter Haftung Elektrische Lampe und Verfahren zur Herstellung
JP2010272308A (ja) * 2009-05-20 2010-12-02 Koito Mfg Co Ltd 車輌用放電灯
JP5118252B2 (ja) * 2009-06-04 2013-01-16 パナソニック株式会社 高圧放電ランプ、ランプユニット、投射型画像表示装置、および高圧放電ランプの製造方法
US8610350B2 (en) * 2009-12-15 2013-12-17 Osram Gesellschaft Mit Beschraenkter Haftung Electrode structures for discharge lamps
CN102652345B (zh) * 2009-12-18 2016-08-17 皇家飞利浦电子股份有限公司 用在电灯中的电极
DE102013211217A1 (de) * 2013-06-14 2014-12-18 Osram Gmbh Hochdruckentladungslampe
DE102013223708A1 (de) 2013-11-20 2015-05-21 Osram Gmbh Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer
DE102015211915A1 (de) 2015-06-26 2016-12-29 Osram Gmbh Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10154485A (ja) 1996-11-22 1998-06-09 Stanley Electric Co Ltd メタルハライドランプ
JP3218560B2 (ja) * 1997-02-07 2001-10-15 スタンレー電気株式会社 前照灯用メタルハライドランプ
JP3039626B2 (ja) 1997-03-21 2000-05-08 スタンレー電気株式会社 メタルハライドランプおよびその製造方法
JPH11233285A (ja) * 1998-02-18 1999-08-27 Aibis:Kk 調光制御装置
CN1235260C (zh) * 2001-03-30 2006-01-04 松下电器产业株式会社 汽车前灯用金属卤化物灯
JP2004039349A (ja) * 2002-07-01 2004-02-05 Matsushita Electric Ind Co Ltd 高圧放電ランプ及び光源ユニット
DE10312290A1 (de) 2003-03-19 2004-09-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe für Fahrzeugscheinwerfer
US6856079B1 (en) * 2003-09-30 2005-02-15 Matsushita Electric Industrial Co., Ltd. Ceramic discharge lamp arc tube seal
US7489081B2 (en) * 2004-04-01 2009-02-10 Koninklijke Philips Electronics N.V. Light burner and method for manufacturing a light burner

Also Published As

Publication number Publication date
DE502005007059D1 (de) 2009-05-20
CA2588555A1 (fr) 2006-06-08
JP2008522372A (ja) 2008-06-26
EP1817790A1 (fr) 2007-08-15
WO2006058513A1 (fr) 2006-06-08
US7705538B2 (en) 2010-04-27
US20070296339A1 (en) 2007-12-27
CN100573807C (zh) 2009-12-23
JP4646257B2 (ja) 2011-03-09
ATE428182T1 (de) 2009-04-15
CN101065825A (zh) 2007-10-31
DE102004057906A1 (de) 2006-06-01

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