EP1817790A1 - Lampe a decharge haute pression - Google Patents

Lampe a decharge haute pression

Info

Publication number
EP1817790A1
EP1817790A1 EP05817115A EP05817115A EP1817790A1 EP 1817790 A1 EP1817790 A1 EP 1817790A1 EP 05817115 A EP05817115 A EP 05817115A EP 05817115 A EP05817115 A EP 05817115A EP 1817790 A1 EP1817790 A1 EP 1817790A1
Authority
EP
European Patent Office
Prior art keywords
electrode
helix
pressure discharge
discharge lamp
molybdenum foil
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
EP05817115A
Other languages
German (de)
English (en)
Other versions
EP1817790B1 (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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1817790A1 publication Critical patent/EP1817790A1/fr
Application granted granted Critical
Publication of EP1817790B1 publication Critical patent/EP1817790B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H01J61/04—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 disclosed, for example, in EP-A 0 858 098.
  • This document describes a metal halide high-pressure discharge lamp for a motor vehicle headlight with a quartz glass discharge vessel having two ends provided with a molybdenum foil seal, and two electrodes each connected to one of the molybdenum foil seals and projecting into the interior of the discharge vessel.
  • a section of the respective electrode, which is arranged outside the molybdenum foil seal in the region of the molybdenum foil sealing end, is surrounded 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.
  • DE 198 12 298 discloses 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 into the interior of the discharge vessel protrude.
  • the electrodes are each surrounded by a helix, wherein the helix in the front, the discharge region facing the housing 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 high-pressure charge 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 protruding 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 located in the region of the molybdenum foil seal provided end of the lamp vessel, outside of the molybdenum foil seal.
  • 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 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 Motor vehicle headlights are used.
  • the electrodes of this lamp type are designed as pin electrodes.
  • the first and last turn of the helix are wound more tightly than the intermediate helix section. It has been found that thereby the desired effect of the helix is not affected.
  • the invention is particularly well suited for high pressure discharge lamps having a comparatively small discharge vessel volume of at most 30 mm J , 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. 1 An electrode for a high-pressure discharge lamp according to the preferred embodiment of the invention with disposed on the electrode coil
  • FIG. 2 An electrode for a high-pressure discharge lamp according to the second embodiment of the invention with arranged on the electrode
  • FIG. 3 A sealed end of the discharge vessel of a high-pressure discharge lamp according to the preferred embodiment of the invention with the electrode shown in Figure 1
  • FIG. 3 shows a sealed by a Molybdänfolienabdichtung end 1 1 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 1 1 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 gas-tight embedded in the closed end of the discharge vessel 1 1 1 molybdenum foil 2.
  • the molybdenum foil 2 has a length of 6.5 mm, a width of 2 mm and a thickness of 25 ⁇ m.
  • the remote from the interior 10 of the discharge vessel 1 end 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 provided with a rod-shaped. made of tungsten electrode 4 welded, 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 Alis exitsbeispiels invention, as shown schematically in Figure 1, only over the arranged in the closed end of the discharge vessel 1 1 section 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 identical to the end of 1 1 formed. In particular, it also has an electrode as shown in Figures 1 and 3, respectively. 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. 2 schematically shows the electrode 4 and the coil 5 'according to the second exemplary embodiment of the invention.
  • This embodiment differs from the first, preferred embodiment only by the helix 5 '.
  • the coil 5 'and the first and last turn at a distance of 340 microns are arranged to their respective adjacent turn, so that the coil 5' has a continuous gradient of 667 percent.
  • the spirals 5 and 5 'agree are arranged to their respective adjacent turn, so that the coil 5' has a continuous gradient of 667 percent.
  • 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.
  • the inner diameter of the helix 5 or 5 1 can also be greater than the diameter of the electrode 4. Good results are also achieved with a helix 5 whose inside diameter is 0.33 mm and which is arranged on an electrode 4 with a diameter of 0.30 mm and in the remaining dimensions with the helix 5 of the first embodiment is identical.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP05817115A 2004-11-30 2005-11-18 Lampe a decharge haute pression Expired - Lifetime 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 true EP1817790A1 (fr) 2007-08-15
EP1817790B1 EP1817790B1 (fr) 2009-04-08

Family

ID=35636666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05817115A Expired - Lifetime 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
WO2007113742A2 (fr) * 2006-04-05 2007-10-11 Koninklijke Philips Electronics N.V. Lampe a decharge haute pression avec tiges d'electrodes equipees d'un moyen pour provoquer des fissures
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
US9449806B2 (en) 2009-06-04 2016-09-20 Panasonic Intellectual Property Management Co., Ltd. High-voltage discharge lamp, lamp unit, projection image display device, and method for manufacturing high-voltage discharge lamp
US8610350B2 (en) 2009-12-15 2013-12-17 Osram Gesellschaft Mit Beschraenkter Haftung Electrode structures for discharge lamps
US9653280B2 (en) * 2009-12-18 2017-05-16 Koninklijke Philips N.V. Electrode for use in a lamp
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
US6809478B2 (en) * 2001-03-30 2004-10-26 Matsushita Electric Industrial Co., Ltd. Metal halide lamp for automobile headlight
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
CN1950919B (zh) * 2004-04-01 2010-06-16 皇家飞利浦电子股份有限公司 一种发光灯及其制造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006058513A1 *

Also Published As

Publication number Publication date
CA2588555A1 (fr) 2006-06-08
ATE428182T1 (de) 2009-04-15
US7705538B2 (en) 2010-04-27
DE102004057906A1 (de) 2006-06-01
JP4646257B2 (ja) 2011-03-09
CN100573807C (zh) 2009-12-23
JP2008522372A (ja) 2008-06-26
CN101065825A (zh) 2007-10-31
EP1817790B1 (fr) 2009-04-08
US20070296339A1 (en) 2007-12-27
DE502005007059D1 (de) 2009-05-20
WO2006058513A1 (fr) 2006-06-08

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