EP2347430B1 - Lampe à décharge sans mercure - Google Patents

Lampe à décharge sans mercure Download PDF

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Publication number
EP2347430B1
EP2347430B1 EP09782856.0A EP09782856A EP2347430B1 EP 2347430 B1 EP2347430 B1 EP 2347430B1 EP 09782856 A EP09782856 A EP 09782856A EP 2347430 B1 EP2347430 B1 EP 2347430B1
Authority
EP
European Patent Office
Prior art keywords
discharge
discharge lamp
lamp according
watts
range
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
EP09782856.0A
Other languages
German (de)
English (en)
Other versions
EP2347430A1 (fr
Inventor
Frank Werner
Matthias Bruchhausen
Grigorios Tsilimis
Florian Bedynek
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 EP2347430A1 publication Critical patent/EP2347430A1/fr
Application granted granted Critical
Publication of EP2347430B1 publication Critical patent/EP2347430B1/fr
Not-in-force legal-status Critical Current
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    • 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
    • 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
    • H01J61/34—Double-wall vessels or containers
    • 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 present invention relates to a mercury-free discharge lamp, in particular a mercury-free metal halide high-pressure discharge lamp for vehicle headlamps, is operated with a power of less than 30 watts, with a light-transmitting discharge vessel, projecting into the discharge space electrodes for generating a gas discharge, wherein in the discharge space metal halides and a Ignition gas are available.
  • the above-mentioned value for the power refers to the quasi-stationary operation of the mercury-free metal halide high-pressure discharge lamp, that is, after completion of its ignition and start-up phase, when the metal halides are completely evaporated in the discharge space of the lamp. During its start-up phase, the lamp can be operated at a much higher power.
  • Mercury-free discharge lamps are known from the prior art, in which the mercury used in a discharge gas is replaced by other metal halides. However, if no mercury is provided in the closed burner piston, the voltage between the electrodes is reduced, so that a higher electrical current is required for the maintenance of the voltage. This results in a higher power dissipation of the ballast for the mercury-free discharge lamp in comparison with a conventional one mercury-containing discharge lamp. Since the installation of a lamp with more than 20001m luminous flux, as they are emitted by a conventional mercury-free discharge lamp, is required to additionally provide a headlight washer and a level control of the lamps, the use of mercury-free lamps as standard equipment for car manufacturers was uninteresting.
  • Object of the present invention is therefore to provide a mercury-free lamp, in particular a mercury-free metal halide high-pressure discharge lamp with reduced power, which can be used in conventional headlamps.
  • the reduced filling quantity of the metal halides leads to an increase in the arc width, so that sufficient arc dimensioning can also be achieved with a discharge lamp operated with a power of less than 30 watts.
  • Another factor influencing the power requirement and the emitted luminous flux is the thermal characteristics of the lamp.
  • the discharge space is also surrounded by an outer bulb, which, filled with air, a certain, although not good thermal insulation of the discharge space represents.
  • an outer bulb which, filled with air, a certain, although not good thermal insulation of the discharge space represents.
  • a gas or gas mixture with a lower thermal conductivity than air is introduced into a gap defined by the outer bulb and the discharge vessel. This means that less heat is dissipated from the discharge chamber to the outer bulb, so that with the same power a higher temperature and thus a higher "cold spot" temperature and light output can be achieved. In conclusion, this leads to the fact that the power with which the discharge lamp is operated can be reduced while the luminous efficacy and temperature remain the same.
  • the gas can be introduced into the intermediate space at a pressure of 0.05-0.2 bar.
  • the pressure of 0.05 bar to 0.2 bar has proved to be particularly advantageous.
  • the power requirement of the lamp is determined in particular via the temperature to be reached in the discharge space
  • other parameters influencing the temperature can also be changed.
  • the temperature prevailing in the discharge space is also determined by the dimensioning of the discharge vessel itself and the electrodes arranged therein.
  • the dimensions of the discharge space can be reduced, wherein advantageously the discharge vessel in an intermediate region between the opposing electrodes has an inner diameter of 1.5 mm to 2.7 mm, in particular of 2.1 mm to 2, 5 mm.
  • the volume of the discharge space is defined to be 17 mm 3 to 22 mm 3 in order to throttle the power requirement of the discharge lamp.
  • the optical distance between the arranged in the discharge space, opposing electrodes is reduced to a value of 3.2 mm to 3.8 mm instead of the usual 4.2 mm.
  • the length of the electrode section extending in the discharge space can be optimized to a value of 0.3 mm to 1.8 mm.
  • the diameter of the electrodes can be adjusted to a value between 0.2 mm to 0.3 mm, in particular 0.23 mm to 0.28 mm, which also affects the temperature in the discharge space and thus the power requirement of the discharge lamp can be.
  • a discharge lamp in which not only the power in normal operation, that is, during their operation after completion of the ignition and start-up phase is reduced, but also the power during the start-up phase of the usual 85 watts to 35 watts to 70 watts, preferably 40 watts to 60 watts is reduced.
  • the lamp is set to a luminous flux of less than 2000 lm and has a power requirement of less than 30 watts.
  • the aforementioned range of values for the power refers to the quasi-stationary operation of the mercury-free metal halide high-pressure discharge lamp, that is after completion of its ignition and start-up phase, when the metal halides are completely evaporated in the discharge space of the lamp.
  • the lamp is preferably operated at a significantly higher power in the range of preferably 40 watts to 60 watts to achieve rapid vaporization of the metal halides.
  • a mercury-free metal halide high-pressure discharge lamp with a power consumption of 25 watts during normal operation and with respect to the prior art increased color temperature.
  • the standard mercury-free metal halide high-pressure discharge lamp for vehicle headlights also called D4 lamp
  • the metal halide high-pressure discharge lamp according to the particularly preferred embodiment of the The invention therefore has a color temperature in the range from 4500 Kelvin to 5200 Kelvin.
  • the metal halides contained in the discharge space of the discharge lamp according to the invention comprise halides of the metals sodium and scandium, the molar ratio of sodium to scandium preferably in the range from 2.0 to 2.8 and more preferably at 2.5 lies.
  • the metal halides contained in the discharge space of the discharge lamp according to the invention for the same purpose also include indium halide in a proportion in the range of 2 percent by weight to 4 percent by weight.
  • xenon having a cold fill pressure in the range of 10 bar to 18 bar is preferably used as the ignition gas to ensure an immediate emission of white light after the ignition of the gas discharge in the high pressure discharge lamp, an increased color temperature and a broadening of the discharge arc.
  • the metal halides also comprise zinc halide in order to increase the burning voltage of the high-pressure discharge lamp according to the invention or to set it to a desired value.
  • FIG. 1 shows a schematic longitudinal cross section through a mercury-free discharge lamp according to the invention.
  • This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 10 made of quartz glass. According to the invention, the discharge space of the discharge vessel has a volume in the range of 17 mm 3 to 22 mm 3 . In the case of the discharge lamp shown here, the discharge space has a volume of 20.0 mm 3 , in which an ionizable filling is enclosed in a gastight manner. In the region of the discharge space 106, the inner contour of the discharge vessel 10 is advantageously circular-cylindrical and its outer contour ellipsoidal.
  • the discharge vessel 10 may be dimensioned such that the inner diameter of the discharge vessel 10 in the region of the discharge space 106 between 1.5 mm to 2.7 mm, in particular between 2.1 mm to 2.5 mm, measures.
  • the inner diameter of the discharge vessel 10 in the region of the discharge chamber 106 is 2.4 mm and its outer diameter is 6.0 mm.
  • the two ends 101, 102 of the discharge vessel 10 are each sealed by means of a molybdenum foil sealing 103, 104.
  • the molybdenum foils 103, 104 each have a length of about 6.5 mm, a width of about 2 mm and a thickness of about 25 microns.
  • the electrodes 11, 12 are made of tungsten. Their thickness or their diameter is in the range of 0.2 mm to 0.3 mm, in particular 0.23 mm to 0.28 mm, wherein the length of the extending into the discharge space 106 portions of the electrodes 0.3 mm to 1 , 8 mm.
  • the optical distance between the projecting into the discharge space 106 ends of the electrodes 11, 12 is approximately 3.2 mm to 3.8 mm.
  • the electrodes 11, 12 are in each case electrically conductively connected to one of the molybdenum foil melts 103, 104 and via the base-remote power supply 13 and the current return 17 or via the socket-side power supply 14 to an electrical connection of the lamp base 15 which consists essentially of plastic.
  • the overlap between the electrode 11 and the molybdenum foil 103 bonded thereto may be 1.3 mm ⁇ 0.15 mm.
  • 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 tube-like 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 may be provided with a transparent, electrically conductive coating 107.
  • This coating 107 preferably extends in the longitudinal direction of the lamp over the entire length of the burner piston 106 and over a part, approximately 50 percent, of the length of the sealed ends 101, 102 of the discharge vessel 10.
  • the coating 107 is preferably on the outside of the discharge vessel 10
  • the coating 107 consists of doped tin oxide, for example of fluorine- or antimony-doped tin oxide or, for example, boron-doped and / or lithium-doped tin oxide.
  • This high-pressure discharge lamp is operated in a horizontal position, ie with electrodes 11, 12 arranged in a horizontal plane, the lamp being aligned such that the current return 17 extends below the discharge vessel 10 and the outer bulb 16. Details of this, acting as a priming coating 107 are in the EP 1 632 985 A1 described.
  • the outer bulb 16 is made of quartz glass doped with ultraviolet ray absorbing materials such as cerium oxide and titanium oxide. Suitable glass compositions for the outer envelope are in the EP 0 700 579 B1 disclosed.
  • light-emitting metal halides and buffer metal halides as well as xenon are included in the discharge space 106 in a gastight manner as start-up inert gas.
  • the light-emitting metal halides which primarily fulfill the function of light emission, are compounds of the halides of Na, Sc and In.
  • the buffer metal halides serve primarily to increase the burning voltage and to control the color to obtain a desired light color (white light).
  • the buffer metal halides may be, for example, a compound of the halides of Al, Cs, Ho, In, Tl, Tm and Zn.
  • the total amount of metal halides according to the invention is 5 mg / ml to 15 mg / ml. This ensures that the arc forming between the electrodes has a sufficient spatial extent, that is to say a sufficient width or a sufficient cross section.
  • the inner diameter of the discharge vessel 10 in the region of the discharge space 106 in the middle between the opposed electrodes 11, 12 is about 1.5 mm to 2.7 mm.
  • the optical distance between the ends of the electrodes 11, 12 projecting into the discharge space 106 is approximately 3.2 mm to 3.8 mm, and the length of the sections of the electrodes 11, 12 extending into the discharge space 106 is approximately 0.3 mm 1.8 mm.
  • the discharge vessel 10 can in the region of the discharge space 106 have smaller internal dimensions along their longitudinal axis than conventional discharge vessels of the prior art, the distance between the discharge-side ends of the electrodes 11, 12 being approximately 3.2 mm to 3.8 mm (less than 4.2 mm, according to FIGS the ECE specifications).
  • the length of the portions of the electrodes 11, 12 extending into the discharge space is about 0.3 mm to 1.8 mm (smaller than the length of 1.0 mm to 2.0 mm according to the prior art).
  • the inner diameter of the discharge vessel 10 in the region of the discharge space 106 in the middle between the opposed electrodes 11, 12 is about 1.5 mm to 2.7 mm (smaller than the corresponding maximum inner diameter of the discharge space according to the prior art).
  • the discharge space 106 thus has a smaller volume.
  • the burning voltage is reduced but the heat dissipation from the discharge space 106 is reduced, the luminous flux and the luminous efficacy can be improved.
  • the electric power supplied to the discharge lamp is about 15 watts to 30 watts and is lower than that of the prior art lamps having an electric power consumption of 35 watts, the discharge lamp of the present invention achieves substantially the same luminous efficiency as the prior art lamps the technology, which is operated with 35 watts.
  • the distance between the discharge-side ends of the electrodes 11, 12 is about 3.2 mm to 3.8 mm (smaller than the ECE specifications) and the length of the In addition, the portions of the electrodes 11, 12 extending into the discharge space 106 are approximately 0.3 mm to 1.8 mm (smaller than the length of 1.0 to 2.0 mm in the prior art), moreover, the light-emitting metal halide can not Condensate at the bottom of the electrodes 11, 12. As a result, the light output is also improved.
  • the space between the discharge vessel 10 and the outer bulb 16 is filled with a rare gas having a pressure of about 1 bar or less, so that the space serves as an insulator against the heat radiated from the discharge space 106.
  • FIG. 2 shows a mercury-free metal halide high-pressure discharge lamp (D4 lamp) in which the gap was filled or evacuated with different gases.
  • D4 lamp mercury-free metal halide high-pressure discharge lamp
  • the applied power is displayed in watts, while the vertical axis is the measured maximum temperature of the outer bulb shows.
  • a lower temperature of the outer bulb means that a lower heat conduction of the filling gas takes place.
  • FIG. 2 Graph 2 shows the measured values of a D4 lamp with air in the outer bulb, Graph 4 the measured values with xenon in the outer bulb and Graph 6 the measured values with evacuated outer bulb.
  • the filling with air shows a greater thermal conductivity and thus a greater outer bulb temperature than the lamps filled with xenon or vacuum.
  • FIG. 1 shows a longitudinal cross section through a metal halide high-pressure discharge lamp according to the particularly preferred embodiments of the invention.
  • halides of the metals sodium, scandium, indium and zinc are contained in the discharge space as metal halides.
  • Xenon is used as ignition gas and for the generation of light immediately after ignition of the gas discharge.
  • the total amount of metal halides in the discharge space 106 in this particularly preferred embodiment is 0.2 mg.
  • the volume of the discharge space 106 is 0.02 ml or 20 mm 3 .
  • the discharge space 106 also contains xenon with a cold filling pressure of 12 bar.
  • the diameter or the thickness of the electrodes 11, 12 in the particularly preferred embodiment is 0.275 mm and the distance or the optically effective distance between the electrodes 11, 12 is 3.6 mm.

Claims (12)

  1. Lampe à décharge sans mercure avec une enceinte de décharge (10) translucide entourée d'une ampoule extérieure (16) translucide et comportant un espace de décharge (106) dans lequel pénètrent des électrodes (11, 12) destinées à produire une décharge de gaz, l'espace de décharge (106) contenant des halogénures métalliques en une quantité de l'ordre de 5 milligrammes à 15 milligrammes par millilitre de volume de l'espace de décharge et un gaz d'amorçage, et les halogénures métalliques comprenant des halogénures des métaux sodium, scandium et indium,
    caractérisée en ce que
    - l'espace de décharge (106) a un volume de l'ordre de 17 mm3 à 22 mm3,
    - l'interstice entre ampoule extérieure (16) et enceinte de décharge (10) est rempli avec un gaz ou mélange de gaz ayant une conductivité thermique inférieure à celle de l'air, ou bien un vide est présent dans ledit interstice, dont la pression est inférieure à 1 mbar,
    - le flux lumineux de la lampe est de moins de 2000 lm, et
    - la puissance électrique absorbée de la lampe, au terme de sa phase d'amorçage et de démarrage lorsque les halogénures métalliques contenues dans l'espace de décharge (106) de la lampe sont totalement évaporés, est de moins de 30 watts.
  2. Lampe à décharge selon la revendication 1, le gaz ou mélange de gaz présent dans l'interstice étant à une pression inférieure à 1 bar, de préférence comprise entre 0,05 et 0,2 bar.
  3. Lampe à décharge selon l'une des revendications précédentes, l'enceinte de décharge (10) ayant au niveau de l'espace de décharge (106), dans une zone médiane entre les électrodes (11, 12), un diamètre intérieur situé dans la plage de valeurs allant de 1,5 mm à 2,7 mm, en particulier de 2,1 mm à 2,5 mm.
  4. Lampe à décharge selon l'une des revendications précédentes, la distance optique entre les électrodes (11, 12) pénétrant dans l'espace de décharge (106) étant située dans la plage de valeurs allant de 3,2 mm à 3,8 mm.
  5. Lampe à décharge selon l'une des revendications précédentes, le diamètre resp. l'épaisseur des électrodes (11, 12) étant de l'ordre de 0,2 mm à 0,3 mm.
  6. Lampe à décharge selon l'une des revendications précédentes, la partie des électrodes (11, 12) s'étendant dans l'espace de décharge (106) ayant une longueur de l'ordre de 0,3 mm à 1,8 mm.
  7. Lampe à décharge selon la revendication 1, les halogénures métalliques comprenant en outre un halogénure de zinc.
  8. Lampe à décharge selon la revendication 1 ou 7, le rapport molaire de sodium au scandium étant situé dans la plage de valeurs allant de 2,0 à 2,8.
  9. Lampe à décharge selon la revendication 1, 7 ou 8, la proportion de l'halogénure d'indium dans les halogénures métalliques étant de l'ordre de 2 % en poids à 4 % en poids.
  10. Lampe à décharge selon l'une des revendications précédentes, le gaz d'amorçage comprenant du xénon à une pression de remplissage à froid de l'ordre de 10 bars à 18 bars.
  11. Lampe à décharge selon l'une des revendications précédentes, la lampe ayant pendant sa phase de démarrage une puissance électrique absorbée de l'ordre de 35 watts à 70 watts, et en particulier de 40 watts à 60 watts.
  12. Lampe à décharge selon l'une des revendications précédentes, la lampe ayant pendant son fonctionnement, au terme de la phase d'amorçage et de démarrage, une puissance électrique absorbée de l'ordre de 20 watts à 25 watts.
EP09782856.0A 2008-11-17 2009-09-10 Lampe à décharge sans mercure Not-in-force EP2347430B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008057703A DE102008057703A1 (de) 2008-11-17 2008-11-17 Quecksilberfreie Entladungslampe
PCT/EP2009/061736 WO2010054872A1 (fr) 2008-11-17 2009-09-10 Lampe à décharge sans mercure

Publications (2)

Publication Number Publication Date
EP2347430A1 EP2347430A1 (fr) 2011-07-27
EP2347430B1 true EP2347430B1 (fr) 2014-06-25

Family

ID=41338626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09782856.0A Not-in-force EP2347430B1 (fr) 2008-11-17 2009-09-10 Lampe à décharge sans mercure

Country Status (5)

Country Link
US (1) US8736165B2 (fr)
EP (1) EP2347430B1 (fr)
DE (1) DE102008057703A1 (fr)
ES (1) ES2493691T3 (fr)
WO (1) WO2010054872A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010043725A1 (de) * 2010-11-10 2012-05-10 Osram Ag Verfahren zum Betreiben einer Hochdruckentladungslampe und Vorrichtung zum Betreiben einer Hochdruckentladungslampe
CN103748657B (zh) * 2011-06-23 2016-02-17 东芝照明技术株式会社 车辆用的无汞金属卤化物灯及金属卤化物灯装置
DE102013223708A1 (de) * 2013-11-20 2015-05-21 Osram Gmbh Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer
DE102014204932A1 (de) * 2014-03-17 2015-09-17 Osram Gmbh Hochdruckentladungslampe
JP2018092829A (ja) * 2016-12-06 2018-06-14 東芝ライテック株式会社 放電ランプ、車両用照明装置、および車両用灯具

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4317369A1 (de) 1993-05-25 1994-12-01 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Hochdruckentladungslampe und Herstellungsverfahren für eine Hochdruckentladungslampe
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
JP2004063158A (ja) 2002-07-25 2004-02-26 Koito Mfg Co Ltd 放電バルブ
JP2004172056A (ja) 2002-11-22 2004-06-17 Koito Mfg Co Ltd 放電ランプ装置用水銀フリーアークチューブ
DE10312290A1 (de) * 2003-03-19 2004-09-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe für Fahrzeugscheinwerfer
EP1632985B1 (fr) 2004-09-07 2014-06-25 OSRAM GmbH Lampe à decharge haute pression

Also Published As

Publication number Publication date
WO2010054872A1 (fr) 2010-05-20
US20110248628A1 (en) 2011-10-13
US8736165B2 (en) 2014-05-27
EP2347430A1 (fr) 2011-07-27
ES2493691T3 (es) 2014-09-12
DE102008057703A1 (de) 2010-05-20

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