EP1754245A2 - Lampe a decharge haute pression - Google Patents

Lampe a decharge haute pression

Info

Publication number
EP1754245A2
EP1754245A2 EP05749222A EP05749222A EP1754245A2 EP 1754245 A2 EP1754245 A2 EP 1754245A2 EP 05749222 A EP05749222 A EP 05749222A EP 05749222 A EP05749222 A EP 05749222A EP 1754245 A2 EP1754245 A2 EP 1754245A2
Authority
EP
European Patent Office
Prior art keywords
pressure discharge
discharge lamp
discharge
electrodes
electrode
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
EP05749222A
Other languages
German (de)
English (en)
Other versions
EP1754245B1 (fr
Inventor
Thomas Bittmann
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 EP1754245A2 publication Critical patent/EP1754245A2/fr
Application granted granted Critical
Publication of EP1754245B1 publication Critical patent/EP1754245B1/fr
Not-in-force 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
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors
    • H01J61/368—Pinched seals or analogous seals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component

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 described, for example, in published patent application EP 0 786 791 A1.
  • This laid-open publication discloses a high-pressure discharge lamp for a motor vehicle headlight which is capped on one side.
  • the high-pressure discharge lamp has a discharge vessel made of quartz glass, which is sealed at two diametrically arranged ends by means of a molybdenum foil in each case.
  • the molybdenum foils are each connected to an electrode which protrude into the interior of the discharge vessel.
  • High-pressure discharge lamps for motor vehicle headlights are usually designed as metal halide high-pressure discharge lamps with an electrical power consumption of less than 100 watts, the ionizable filling of which contains, in addition to xenon, halides of sodium and scandium.
  • the molybdenum foils embedded in the sealed ends of the discharge vessel are exposed to high thermal stress during lamp operation, and the molybdenum foil area in the discharge-side area connected to the electrode causes the molybdenum foil to lift off from the quartz glass and to crack in the glass and thus prematurely Failure of the lamp.
  • This problem occurs in particular in the case of mercury-free metal-halide high-pressure discharge lamps, the molybdenum foils of which are exposed to an even greater thermal load than the molybdenum foils of the conventional metal-halide high-pressure discharge lamps containing mercury due to the comparatively higher lamp current and the comparatively thicker electrodes.
  • the high-pressure discharge lamp according to the invention for vehicle headlights with a power consumption of less than 100 watts has a quartz glass discharge vessel which has two opposite ends sealed by means of molybdenum foils, two electrodes in the interior of the discharge vessel, each of which is connected to one of the molybdenum foils, and a xenon as well as halides of sodium and scandium containing ionizable filling for generating a gas discharge, and is characterized by the fact that the smallest distance of the respective molybdenum foil to the end of the electrode connected to it projecting into the interior of the discharge vessel is more than 5 mm is.
  • the thermal load on the molybdenum foil region connected to the electrode is reduced to a sufficient extent in order to reduce the problem described above.
  • Electrode reduces the thermal load on the discharge-side end of the molybdenum foils by approx. 15%, thereby extending the life of the lamps by approx. 50%.
  • the invention can be applied particularly advantageously to high-pressure discharge lamps, the electrodes of which, during lamp operation, are measurements cause a comparatively high heat transfer to the molybdenum foils, such as mercury-free metal halide high-pressure discharge lamps, the electrodes of which have a comparatively large thickness or a comparatively large diameter in the range from 0.25 mm to 0.45 mm.
  • the minimum distance between the molybdenum foil in the case of mercury-free metal halide high-pressure discharge lamps and the end of the connected protruding into the interior of the discharge vessel Electrode preferably at most 8 mm.
  • FIG. 1 shows a side view of a high-pressure discharge lamp according to the preferred exemplary embodiment in a schematic illustration
  • FIG 2 The discharge vessel of the high-pressure discharge lamp shown in Figure 1 with dimensions for the electrodes and molybdenum foils
  • the preferred exemplary embodiment of the invention 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 30 made of quartz glass with a volume of 24 mm 3 , in which an ionizable filling is enclosed gas-tight.
  • the inner contour of the discharge vessel 30 is circular-cylindrical and its outer contour is ellipsoidal.
  • the inside diameter of the discharge space 106 is 2.6 mm and its outside diameter is 6.3 mm.
  • the two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molybdenum foil 103, 104 melted or squeezed therein.
  • the molybdenum foils 103, 104 each have a length of 6.5 mm, a width of 2 mm and a thickness of 25 ⁇ m.
  • the electrodes 11, 12 consist of tungsten. Their thickness or diameter is 0.30 mm.
  • the length of the electrodes 11, 12 is 7.5 mm in each case.
  • the distance between the electrodes 11, 12 is 4.1 mm.
  • the electrodes 11, 12 are each electrically conductively connected to an electrical connection of the lamp base 15, which essentially consists of plastic, via one of the molybdenum foils 103, 104 and via the current supply line 13 remote from the base or via the current return 14 on the rear side.
  • the overlap B between the electrode 11 and the molybdenum foil 103 connected to it is 1.3 mm ⁇ 0.15 mm.
  • the smallest distance A of the molybdenum foil 103 from the end of the electrode 11 projecting into the interior of the discharge vessel 10 is 6.2 mm ⁇ 0.15 mm. This means that the distance between the molybdenum foil 11 and the discharge arc which forms in the discharge vessel 10 during lamp operation is 6.2 mm ⁇ 0.15 mm.
  • the smallest distance between the molybdenum foil 104 and the end of the electrode 12 projecting into the interior of the discharge vessel 10 is likewise 6.2 mm ⁇ 0.15 mm, because the discharge vessel 10 with the electrodes 11, 12 and the sealed ends 101, 102 is essentially mirror-symmetrical to a mirror axis running through the center of the discharge vessel and oriented perpendicular to the longitudinal axis of the discharge vessel 10.
  • the maximum temperature load on the molybdenum foils 103, 104 could be less than 475 ° C can be limited.
  • the discharge vessel 10 is enveloped by an outer bulb 16, which consists of Quartz glass or tempered glass.
  • the quartz glass or hard glass of the outer bulb 16 is provided with the usual UV-absorbing additives.
  • the outer bulb 16 has an extension 161 anchored in the base 15.
  • the outer diameter of the outer bulb 16 is 9 mm and its wall thickness is 0.9 mm.
  • the discharge vessel 10 has a tubular extension 105 made of quartz glass on the base side, in which the power supply 14 on the base side runs.
  • the electrodes 11, 12, the molybdenum foils 103, 104 and / or current leads 13, 14 can be coated with ruthenium in the region of the sealed ends 101, 102 of the discharge vessel 10.
  • the ionizable filling enclosed in the discharge vessel consists of xenon with a cold filling pressure of 11,800 hPa, 0.25 mg sodium iodide, 0.18 mg scandium iodide, 0.03 mg zinc iodide and 0.0024 mg indium iodide.
  • the operating voltage U of the lamp is 45 volts.
  • the invention is not limited to the exemplary embodiment explained in more detail above, but can also be used, for example, on mercury-containing metal halide high-pressure discharge lamps for vehicle headlights, the electrodes of which have a smaller diameter of approximately 0.239 mm.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne une lampe à décharge haute pression destinée à un projecteur de véhicule, absorbant une puissance de moins de 100 watt. Selon l'invention, la lampe à décharge haute pression comprend un récipient de décharge (10) en verre de quartz, qui présente deux extrémités (101, 102) opposées, isolées par des films de molybdène (103, 104), et l'espace intérieur (106) du récipient de décharge (10), comprend deux électrodes (11, 12) qui sont reliées respectivement à l'un des films de molybdène (103, 104), et une matière de remplissage ionisable qui contient du xénon et de l'halogénure de sodium et de scandium, pour produire une décharge de gaz. Selon l'invention, la distance minimale (A) qui sépare le film de molybdène respectif (103, 104) de l'extrémité de l'électrode (11, 12) à laquelle il est relié, qui dépasse dans l'espace interne (106) du récipient de décharge (10), vaut plus de 5 mm.
EP05749222.5A 2004-05-13 2005-04-29 Lampe a decharge haute pression Not-in-force EP1754245B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004024063A DE102004024063A1 (de) 2004-05-13 2004-05-13 Hochdruckentladungslampe
PCT/DE2005/000792 WO2005112074A2 (fr) 2004-05-13 2005-04-29 Lampe a decharge haute pression

Publications (2)

Publication Number Publication Date
EP1754245A2 true EP1754245A2 (fr) 2007-02-21
EP1754245B1 EP1754245B1 (fr) 2017-08-30

Family

ID=35267468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05749222.5A Not-in-force EP1754245B1 (fr) 2004-05-13 2005-04-29 Lampe a decharge haute pression

Country Status (7)

Country Link
US (1) US20070222387A1 (fr)
EP (1) EP1754245B1 (fr)
JP (1) JP2007537564A (fr)
CN (1) CN101036214B (fr)
CA (1) CA2566035A1 (fr)
DE (1) DE102004024063A1 (fr)
WO (1) WO2005112074A2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007018614A1 (de) * 2007-04-19 2008-10-23 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe und Fahrzeugscheinwerfer mit Hochdruckentladungslampe
WO2008142643A2 (fr) * 2007-05-24 2008-11-27 Philips Intellectual Property & Standards Gmbh Unité de lampe et de phare pour véhicule à moteur
DE102007043165A1 (de) 2007-09-11 2009-03-12 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe und Fahrzeugscheinwerfer mit Hochdruckentladungslampe
DE102008014096A1 (de) 2008-03-05 2009-09-10 Osram Gesellschaft mit beschränkter Haftung Wolframelektrode für Hochdruckentladungslampen und Hochdruckentladungslampe mit einer Wolframelektrode
DE102008013607B3 (de) 2008-03-11 2010-02-04 Blv Licht- Und Vakuumtechnik Gmbh Quecksilberfreie Metallhalogenid-Hochdruckentladungslampe
EP2269211B1 (fr) * 2008-04-14 2012-02-01 Philips Intellectual Property & Standards GmbH Lampe à décharge à efficacité élevée
DE102008026521A1 (de) 2008-06-03 2009-12-10 Osram Gesellschaft mit beschränkter Haftung Thoriumfreie Hochdruckentladungslampe für Hochfrequenzbetrieb
CN102714128B (zh) * 2010-01-28 2016-04-20 皇家飞利浦电子股份有限公司 具有减小高度的燃烧器和制造燃烧器的方法
CN104183466A (zh) * 2013-05-28 2014-12-03 海洋王照明科技股份有限公司 陶瓷金卤灯
DE102013223708A1 (de) 2013-11-20 2015-05-21 Osram Gmbh Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer
JP2017098009A (ja) * 2015-11-20 2017-06-01 東芝ライテック株式会社 放電ランプ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2650463B2 (ja) * 1989-05-31 1997-09-03 岩崎電気株式会社 メタルハライドランプ
JPH11238488A (ja) * 1997-06-06 1999-08-31 Toshiba Lighting & Technology Corp メタルハライド放電ランプ、メタルハライド放電ランプ点灯装置および照明装置
DE19731168A1 (de) * 1997-07-21 1999-01-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Beleuchtungssystem
JP3718077B2 (ja) * 1999-03-16 2005-11-16 松下電器産業株式会社 メタルハライドランプ
US6809478B2 (en) * 2001-03-30 2004-10-26 Matsushita Electric Industrial Co., Ltd. Metal halide lamp for automobile headlight
JP2003282021A (ja) * 2002-03-25 2003-10-03 Toshiba Lighting & Technology Corp 高圧放電ランプ、ランプ用石英ガラスバルブの製造方法および照明装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005112074A2 *

Also Published As

Publication number Publication date
CN101036214B (zh) 2011-06-22
EP1754245B1 (fr) 2017-08-30
WO2005112074A3 (fr) 2007-04-19
CN101036214A (zh) 2007-09-12
US20070222387A1 (en) 2007-09-27
DE102004024063A1 (de) 2005-12-01
JP2007537564A (ja) 2007-12-20
WO2005112074A2 (fr) 2005-11-24
CA2566035A1 (fr) 2005-11-24

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