EP2499657B1 - Quecksilberfreie hochdruckentladungslampe mit reduziertem zinkhalogenidanteil - Google Patents

Quecksilberfreie hochdruckentladungslampe mit reduziertem zinkhalogenidanteil Download PDF

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Publication number
EP2499657B1
EP2499657B1 EP10775785.8A EP10775785A EP2499657B1 EP 2499657 B1 EP2499657 B1 EP 2499657B1 EP 10775785 A EP10775785 A EP 10775785A EP 2499657 B1 EP2499657 B1 EP 2499657B1
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EP
European Patent Office
Prior art keywords
discharge lamp
pressure discharge
range
discharge
halide
Prior art date
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Not-in-force
Application number
EP10775785.8A
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German (de)
English (en)
French (fr)
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EP2499657A1 (de
Inventor
Frank Werner
Dmitry Zakharov
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
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Osram GmbH
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Publication of EP2499657A1 publication Critical patent/EP2499657A1/de
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Publication of EP2499657B1 publication Critical patent/EP2499657B1/de
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
    • H01J61/82—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 US 2009/200944 A disclosed.
  • This document describes a high-pressure discharge lamp for vehicle headlights with eg ("arc tube group 3-2" in Fig. 4 and 7 and the associated description in [0050] ff) a volume of the discharge space of 0.0187 cm 3 , a halide concentration (iodide density ) of 10.7 mg / cm 3 , a zinc halide content of 9%, thus 0.96 mg / cm 3 of the discharge space volume, and a cold fill pressure of xenon of 177 megapascals (17.5 atm.
  • Another high pressure discharge lamp for vehicle headlights is in the EP 1 351 276 A2 disclosed; with a mercury-free filling having a zinc iodide content in the range of 2 mg to 6 mg per 1 cm 3 of the discharge vessel volume.
  • the US 2008/001543 A1 discloses a mercury-free metal halide high pressure discharge lamp whose fill contains a halide of thulium.
  • the zinc component of the filling replaces the mercury used earlier and is needed to adjust the so-called burning voltage of the high-pressure discharge lamp.
  • the term firing voltage refers to the operating voltage of the high-pressure discharge lamp after completion of its ignition and start-up phase and the achievement of its quasi-steady-state operating state in which all filling components are present in the gaseous state.
  • the use of the zinc component in the filling has the disadvantage that the luminous flux generated by the high-pressure discharge lamp decreases with increasing zinc content in the filling.
  • a high-pressure discharge lamp with a mercury-free filling is to be provided, which has a reduced compared to the above-cited prior art electrical power consumption and a comparable burning voltage and generates a sufficiently high for use as a light source in the vehicle headlights luminous flux.
  • the high-pressure discharge lamp according to the invention is provided as a light source in headlights of motor vehicles and has a discharge chamber sealed in a gastight manner, in which electrodes and a filling for generating a gas discharge are enclosed, wherein the filling is formed as a mercury-free filling, the at least xenon and halides of sodium , Scandium, and zinc.
  • the filling is formed as a zinc reduced filling having a zinc halide content in the range of greater than 0 mg to 1.0 mg per 1 cm 3 of the discharge space volume, the amount of halides in the discharge space is in the range of 8 mg to 15 mg per 1 cm 3 of the Discharge space volume, the cold pressure of xenon (which is the pressure of the xenon in the discharge space, measured at a temperature of 25 degrees Celsius) is in the range of 1.0 megapascal to 1.8 megapascals and the volume of the discharge space has a value in the range of 0.015 cm 3 to 0.022 cm 3 .
  • the term mercury-free filling means that neither mercury nor a mercury compound is introduced into the discharge space of the discharge vessel.
  • the filling of the high-pressure discharge lamp according to the invention contains thulium in the form of thulium halide for adjusting the burning voltage, the content of thulium halide in the filling being in the range from 10% to 30% by weight of the halides.
  • the effect of thulium is similar to that of zinc, namely the increase of the burning voltage, the decrease of the luminous flux with increasing Thuliumanteil is not as strong as the zinc.
  • a high-pressure discharge lamp is made possible according to the invention, which has a reduced electrical power consumption at comparable burning voltage compared to the high-pressure discharge lamp according to the prior art and generates a sufficiently high luminous flux, so that it is suitable as a light source in headlights of motor vehicles.
  • a high luminous flux can be achieved.
  • the proportion of zinc halide in the filling in the range of 0.1 mg to 1.0 mg per 1 cm 3 of the discharge space volume in order to ensure a sufficiently high burning voltage and luminous flux of the high-pressure discharge lamp.
  • FIG. 3 is schematic the relationship between the proportion of zinc halide in percent by weight of the amount of halide in the discharge space and the luminous flux of the high-pressure discharge lamp (curve 1) and the burning voltage of the high-pressure discharge lamp (curve 2).
  • Curve 1 the proportion of zinc halide in percent by weight of the amount of halide in the discharge space and the luminous flux of the high-pressure discharge lamp
  • curve 2 the burning voltage of the high-pressure discharge lamp
  • the filling of the high-pressure discharge lamp according to the invention additionally contains indium halide, wherein the proportion of indium halide in the filling is less than or equal to 3.0 percent by weight of the total amount of halides and thus significantly lower than the proportion of sodium and scandium halide in the filling.
  • the small indium halide content in the filling serves to adjust the color locus of the white light emitted by the high-pressure discharge lamp in the standard color chart according to CIE 1931 and DIN 5033.
  • the comparatively low Indiumhalogenidanteils in the filling ensures that the high-pressure discharge lamp according to the invention generates white light according to the standard ECE Rule 99.
  • a higher indium halide content would adversely affect the luminous flux of the high pressure discharge lamp.
  • the content of sodium halide in the filling ranges from 30% to 50% by weight of the total amount of halides and the content of scandium halide in the filling ranges from 30% to 60% by weight of the total amount of halides to white light according to ECE Rule 99 with a color temperature in the range of 4000 Kelvin to 4500 Kelvin to produce.
  • the proportion of zinc halide in the charge is less than or equal to 6 percent by weight based on the total amount of halides. This allows a sufficiently high operating voltage (40V) to be set without the luminous flux being too low due to the addition of zinc.
  • the discharge vessel of the high-pressure discharge lamp according to the invention advantageously has an ellipsoidal outer contour in the region of the discharge space and a circular-cylindrical inner contour in the region between the electrodes, wherein the relationship between the wall thickness of the discharge vessel 1 . 0 ⁇ D ⁇ 1 / D ⁇ 2 ⁇ 1 . 4 and preferably even the relationship 1 . 2 ⁇ D ⁇ 1 / D ⁇ 2 ⁇ 1 . 3 is where D1 denotes the wall thickness of the discharge vessel in the region between the electrodes and D2 the wall thickness of the discharge vessel in the end portions of the discharge space in which the electrodes are arranged.
  • the discharge vessel of the high-pressure discharge lamp according to the invention has a lower convex curvature than the discharge vessel of high-pressure discharge lamps according to the prior art. Therefore, in the case of the high-pressure discharge lamp according to the invention, for example, the optical or optically effective electrode spacing of 4.2 mm prescribed in accordance with ECE Rule 99 can be achieved with the aid of a comparatively larger actual electrode spacing (measured by means of X-ray exposure) than with high-pressure discharge lamps according to the prior art.
  • the actual electrode spacing is 3.6 mm
  • the real electrode spacing in the high-pressure discharge lamps according to the invention is preferably in the range of 3.8 mm to 4.0 mm.
  • the comparatively larger electrode spacing also contributes to a higher burning voltage of the high-pressure discharge lamp according to the invention, so that a sufficiently high burning voltage can be achieved even for this reason, despite the reduction of the amount of zinc component and the absence of mercury in the filling.
  • the discharge vessel in the region between the electrodes has an inner diameter in the range of 2.0 mm to 2.7 mm, more preferably in the range of 2.1 mm and 2.4 mm, and an outer diameter in the range of 5.0 mm and 6.0 mm, more preferably in the range of 5.3 mm and 5.7 mm.
  • the discharge vessel in the region between the electrodes has a comparatively high wall thickness, which contributes to improved burst protection and good thermal insulation of the discharge vessel.
  • the electrodes of the high-pressure discharge lamp according to the invention are preferably rod-shaped and have a diameter which is preferably in the range of 0.20 mm to 0.30 mm and particularly preferably in the range of 0.25 mm to 0.27 mm in order to ensure a high current carrying capacity of To ensure electrodes so that the high-pressure discharge lamp according to the invention during the so-called start-up phase, which immediately follows the ignition phase and during which evaporate the halides of the filling, can be operated with three to five times the value of the rated power and thereby faster
  • Transition can be achieved in the quasi-stationary operating state of the high-pressure discharge lamp.
  • the cold filling pressure of xenon in the filling of the high-pressure discharge lamp according to the invention is in the range from 1.0 megapascal to 1.8 megapascal.
  • the range of 1.5 megapascals to 1.7 megapascals is particularly preferred because the burning voltage of the high-pressure discharge lamp according to the invention can be increased by the comparatively high xenon pressure and white light can already be generated by means of the high xenon pressure immediately after the ignition of the high-pressure discharge lamp.
  • the amount of halides in the interior of the discharge vessel of the high-pressure discharge lamp according to the invention is in the range of 8 milligrams to 15 milligrams per 1 cubic centimeter of the discharge space volume and the discharge space volume has a value in the range of 0.015 cubic centimeters to 0.022 cubic centimeters, as already mentioned above.
  • a halide amount in the range of 10 milligrams to 14 milligrams per cubic centimeter of the discharge space volume and a discharge space volume in the range of 0.016 cubic centimeters to 0.019 cubic centimeters for the high pressure discharge lamp of the invention to provide an electrical power consumption in the range of 22 watts to 28 watts in the quasi steady state operating condition To enable high pressure discharge lamp according to the invention.
  • the high-pressure discharge lamp according to the invention can be designed such that during its operation a Luminous flux of less than or equal to 2000 lm generated in order to use the high-pressure discharge lamp according to the invention in vehicle headlights, which have no headlight washer.
  • the invention is a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of 25 watts.
  • This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 10 made of quartz glass with a volume of the discharge space 106 of 17 mm 3 , in which an ionizable filling is enclosed gas-tight.
  • the outer contour of the discharge vessel 10 is ellipsoidal in shape and its inner contour is circular-cylindrical in the region between the electrodes 11, 12 ( Fig. 2 ).
  • the wall of the discharge vessel 10 is thus convexly curved in the region of the discharge space 106 and has a greater wall thickness between the electrodes 11, 12 than at the two ends of the discharge space 106, in which the electrodes 11, 12 are arranged.
  • the ratio of the wall thicknesses D1 / D2 is in the range of 1.2 to 1.3. That is, it applies the relationship 1 . 2 ⁇ D ⁇ 1 / D ⁇ 2 ⁇ 1 . 3 wherein D1, the wall thickness of the discharge vessel 10 in the region between the electrodes 11, 12 and D2, the wall thickness of the discharge vessel 10 in the end portions of the discharge space 106, in which the electrodes 11, 12 are arranged.
  • the inner diameter of the discharge vessel is 2.2 mm and its outer diameter is 5.5 mm there.
  • 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 7.5 mm, a width of 2 mm and a thickness of 25 microns.
  • In the interior of the discharge vessel 10 are two electrodes 11, 12, between which forms during the lamp operation responsible for the light emission discharge arc.
  • the electrodes 11, 12 are made of tungsten. Their thickness or their diameter is 0.26 mm.
  • the length of the electrodes 11, 12 is in each case 6.5 mm.
  • the real that is, measured by means of X-ray recording distance between the electrodes 11, 12 is 3.7 mm, while the optical or optically effective distance between the electrodes 11, 12 is about 3.9 mm.
  • This difference between the real and the optical distance of the electrodes 11, 12 is caused by the optical properties (for example, by the convex curvature and the optical refractive index) of the wall of the discharge vessel 10 in the region of the discharge space 106.
  • 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 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 is provided with a transparent, electrically conductive coating 107.
  • This coating 107 extends in the longitudinal direction of the lamp over the entire length of the discharge space 106 and over a part, about 50 percent, of the length of the sealed ends 101, 102 of the discharge vessel 10.
  • the coating 107 is mounted on the outside of the discharge vessel 10 and covers about 5 percent to 10 percent of the circumference of the discharge vessel 10.
  • the coating 107 may also extend over 50 percent of the circumference of the discharge vessel 10 or even over more than 50 percent of the circumference of the discharge vessel 10.
  • Such a wide configuration of the coating 107 has the advantage of increasing the efficiency of the high pressure discharge lamp, as it reflects a portion of the infrared radiation generated by the discharge back into the discharge vessel and thereby for selective heating of the colder areas below the electrodes during lamp operation of the discharge vessel 10, in which collect the metal halides of the ionizable filling.
  • the coating 107 consists of doped tin oxide, for example of tin oxide doped with fluorine or antimony or, for example, boron and / or lithium doped tin oxide.
  • This high-pressure discharge lamp is operated in a horizontal position, that is, with arranged in a horizontal plane electrodes 11, 12, wherein the lamp is oriented such that the current return path 17 extends below the discharge vessel 30 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.
  • the ionizable filling enclosed in the discharge vessel consists of xenon with a cold filling pressure which means a measured at a temperature of 25 ° C filling pressure, of 1.6 megapascals, and the iodides of sodium, scandium, zinc and indium.
  • the burning voltage of the lamp is about 40 volts. Its color temperature is around 4500 Kelvin.
  • the total amount of the halides or iodides of the metals sodium, scandium, zinc and indium in the filling is 13.83 mg / cm 3 , that is 13.83 milligrams per 1 cubic centimeter of discharge space volume, wherein the weight proportions of the iodides of the metals sodium, scandium , Zinc and indium based on the total amount of halides are as follows: sodium: 43.4% by weight, corresponding to a capacity of 6 mg / cm 3 scandium: 50.6 weight percent, corresponding to a capacity of 7 mg / cm 3 iodide: 5.8% by weight, corresponding to a capacity of 0.8 mg / cm 3 indium: 0.2 weight percent, corresponding to a capacity of 0.03 mg / cm 3
  • the color rendering index of the metal halide high pressure discharge lamp is 65 and its luminous efficacy is 90 lm / W.
  • the wall load is about 80 W / cm 2 .
  • the high-pressure discharge lamp generates a luminous flux of less than or equal to 2000 Im and can therefore be operated in vehicle headlamps without headlight washer, for example, to generate a daytime running light, fog light or continuous running light.
  • the metal halide high-pressure discharge lamp is operated immediately after the ignition of the gas discharge in the discharge vessel at three to five times its rated power or rated current, in order to ensure rapid evaporation of the metal halides in the ionizable filling. Immediately after the ignition of the gas discharge, it is almost exclusively carried by the xenon, since only the xenon is present in gaseous form in the discharge vessel at this time.
  • the high-pressure discharge lamp operates at this time and during the so-called start-up phase, during which the metal halides of the ionizable filling in the vapor phase, so like a high-pressure xenon discharge lamp, in which both the light emission and the electrical properties of the discharge, in particular the voltage drop across the Discharge range, to be determined solely by the xenon and the electrode distance.
  • a quasi-stationary operating state of the lamp is reached, in which the lamp is operated with its rated power of 25 watts and a burning voltage of 40 volts.
  • burning voltage therefore refers to the operating voltage of the high-pressure discharge lamp in quasi-stationary operation.
  • the filling of the high-pressure discharge lamp according to the invention also contains 10-30 weight percent thulium iodide in addition to the iodides of the metals sodium, scandium, zinc and, for example, indium.
  • iodides of the aforementioned metals instead of iodides of the aforementioned metals or in addition to the iodides of these metals, other halides, for example, bromides or chlorides of these metals in the filling can be used.

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  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP10775785.8A 2009-11-12 2010-10-29 Quecksilberfreie hochdruckentladungslampe mit reduziertem zinkhalogenidanteil Not-in-force EP2499657B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910052999 DE102009052999A1 (de) 2009-11-12 2009-11-12 Hochdruckentladungslampe
PCT/EP2010/066472 WO2011057903A1 (de) 2009-11-12 2010-10-29 Quecksilberfreie hochdruckentladungslampe mit reduziertem zinkhalogenidanteil

Publications (2)

Publication Number Publication Date
EP2499657A1 EP2499657A1 (de) 2012-09-19
EP2499657B1 true EP2499657B1 (de) 2014-12-03

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Application Number Title Priority Date Filing Date
EP10775785.8A Not-in-force EP2499657B1 (de) 2009-11-12 2010-10-29 Quecksilberfreie hochdruckentladungslampe mit reduziertem zinkhalogenidanteil

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Country Link
EP (1) EP2499657B1 (zh)
JP (1) JP2013511117A (zh)
CN (1) CN102687235B (zh)
DE (1) DE102009052999A1 (zh)
WO (1) WO2011057903A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011082323A1 (de) * 2011-09-08 2013-03-14 Osram Ag Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer
DE102014204932A1 (de) * 2014-03-17 2015-09-17 Osram Gmbh Hochdruckentladungslampe
DE102015200162A1 (de) 2015-01-08 2016-07-14 Osram Gmbh Hochdruckentladungslampe
JP2016181381A (ja) * 2015-03-24 2016-10-13 東芝ライテック株式会社 放電ランプ
JP2017098009A (ja) * 2015-11-20 2017-06-01 東芝ライテック株式会社 放電ランプ
JP6850434B2 (ja) * 2017-04-26 2021-03-31 東芝ライテック株式会社 放電ランプ

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2086001A1 (en) * 2006-11-09 2009-08-05 Harison Toshiba Lighting Corp. Metal halide lamp

Family Cites Families (14)

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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
US6853140B2 (en) 2002-04-04 2005-02-08 Osram Sylvania Inc. Mercury free discharge lamp with zinc iodide
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 (de) 2004-09-07 2014-06-25 OSRAM GmbH Hochdruckentladungslampe
CN101053059A (zh) * 2004-10-29 2007-10-10 东芝照明技术株式会社 金属卤化物灯以及照明装置
US20080001543A1 (en) * 2004-10-29 2008-01-03 Takahito Kashiwagi Metal Halide Lamp and Lighting Equipment
WO2007004663A1 (ja) * 2005-07-05 2007-01-11 Harison Toshiba Lighting Corporation メタルハライドランプおよびこれを用いた照明装置
US8030847B2 (en) * 2007-03-12 2011-10-04 Koninklijke Philips Electronics N.V. Low power discharge lamp with high efficacy
EP2143130A2 (en) * 2007-04-05 2010-01-13 Philips Intellectual Property & Standards GmbH Mercury-free high intensity gas-discharge lamp
DE102007018614A1 (de) * 2007-04-19 2008-10-23 Osram Gesellschaft mit beschränkter Haftung Hochdruckentladungslampe und Fahrzeugscheinwerfer mit Hochdruckentladungslampe
EP2195824B1 (en) * 2007-09-24 2017-05-10 Philips Intellectual Property & Standards GmbH Thorium-free discharge lamp
JP5313710B2 (ja) * 2008-02-12 2013-10-09 株式会社小糸製作所 放電ランプ装置用水銀フリーアークチューブ
ATE544171T1 (de) * 2008-04-14 2012-02-15 Koninkl Philips Electronics Nv Entladungslampe mit hohem wirkungsgrad

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2086001A1 (en) * 2006-11-09 2009-08-05 Harison Toshiba Lighting Corp. Metal halide lamp

Also Published As

Publication number Publication date
CN102687235B (zh) 2015-07-08
JP2013511117A (ja) 2013-03-28
WO2011057903A1 (de) 2011-05-19
CN102687235A (zh) 2012-09-19
EP2499657A1 (de) 2012-09-19
DE102009052999A1 (de) 2011-05-19

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