EP3072146B1 - Hochdruckentladungslampe für kraftfahrzeugscheinwerfer - Google Patents

Hochdruckentladungslampe für kraftfahrzeugscheinwerfer Download PDF

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Publication number
EP3072146B1
EP3072146B1 EP14793861.7A EP14793861A EP3072146B1 EP 3072146 B1 EP3072146 B1 EP 3072146B1 EP 14793861 A EP14793861 A EP 14793861A EP 3072146 B1 EP3072146 B1 EP 3072146B1
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EP
European Patent Office
Prior art keywords
discharge
milligrams
ranges
volume
pressure
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
EP14793861.7A
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German (de)
English (en)
French (fr)
Other versions
EP3072146A1 (de
Inventor
Peter Flesch
Hasnaa Sarroukh
Dirk Grundmann
Markus Zahn
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 date
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Publication of EP3072146A1 publication Critical patent/EP3072146A1/de
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Publication of EP3072146B1 publication Critical patent/EP3072146B1/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
    • 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 for motor vehicle headlights according to the preamble of patent claim 1.
  • Such a high-pressure discharge lamp is for example in the published patent application EP 1 465 237 A2 described.
  • This document discloses a high pressure discharge lamp for motor vehicle headlamps having two gas discharge electrodes arranged at a pitch of 4.2 mm and mercury free discharge medium containing xenon at a cold filling pressure of 1.18 megapascal and iodides of the metals sodium, scandium, zinc and indium ,
  • the high-pressure discharge lamp according to the invention has a gas-tight discharge vessel, in which gas discharge electrodes and a discharge medium for generating a gas discharge are enclosed, wherein the discharge medium mercury-free is formed and comprises at least xenon and iodides of the metals sodium and scandium.
  • the distance between the gas discharge electrodes has a value in the value range from 2.0 mm to 3.0 mm and the cold filling pressure of xenon is in the value range from 1.5 megapascals to 2.0 megapascals.
  • the term "cold filling pressure of xenon” designates the filling pressure of the xenon measured in the discharge vessel of the high-pressure discharge lamp at a temperature of 22 degrees Celsius.
  • the high-pressure discharge lamp according to the invention Due to the comparatively small distance between the gas discharge electrodes, a correspondingly short discharge arc is ensured which enables the high-pressure discharge lamp according to the invention to correspond to the ideal of a point light source considerably more than high-pressure discharge lamps according to the prior art.
  • an increase in the luminance in the discharge arc is ensured by the small distance between the gas discharge electrodes, and by means of the comparatively high cold filling pressure of the xenon, a sufficiently high burning voltage of the high-pressure discharge lamp according to the invention is ensured despite the shortened distance between the gas discharge electrodes.
  • the high cold filling pressure of xenon offers the advantage that the high-pressure discharge lamp according to the invention generates white light with sufficiently high luminous flux immediately after ignition of the gas discharge.
  • the value for the cold filling pressure Xenon is preferred in the range of 1.65 megapascals to 1.9 megapascals.
  • the proportion by weight of sodium iodide in the discharge medium in the value range of 4.4 micrograms to 9.3 micrograms per 1 mm 3 discharge vessel volume and preferably in the range of 4.5 micrograms to 8.0 micrograms per 1 mm 3 discharge vessel volume and especially preferably in the range from 5.3 micrograms to 7.5 micrograms, and most preferably in the range from 5.3 micrograms to 6.7 micrograms per 1 mm 3 discharge vessel volume.
  • the proportion by weight of scandium iodide in the discharge medium of the high-pressure discharge lamp according to the invention is advantageously in the range from 3.3 micrograms to 7.4 micrograms per 1 mm 3 discharge vessel volume and preferably in the value range from 3.5 micrograms to 7.2 micrograms per 1 mm 3 discharge vessel volume and particularly preferred in the range from 4.4 micrograms to 6.5 and most preferably in the range from 4.4 micrograms to 6.2 micrograms per 1 mm 3 discharge vessel volume. This ensures a sufficiently high proportion of yellow and red light in the spectrum of the light emitted by the high-pressure discharge lamp according to the invention.
  • the discharge medium of the high-pressure discharge lamp according to the invention advantageously additionally comprises zinc iodide with a weight fraction of less than or equal to 4.4 micrograms per 1 mm 3 discharge vessel volume as a further component in order to further increase the burning voltage of the high-pressure discharge lamp according to the invention.
  • the weight proportion of zinc iodide for the aforementioned purpose in the range of 0.5 micrograms to 3.6 micrograms per 1 mm 3 discharge vessel volume and more preferably in the range of 1.8 micrograms to 3.4 micrograms and most preferably in the range of 1 , 8 micrograms to 2.2 micrograms per 1 mm 3 discharge vessel volume.
  • the discharge medium of the high-pressure discharge lamp according to the invention additionally comprises indium iodide as further component with a weight fraction of less than or equal to 1.2 micrograms per 1 mm 3 discharge vessel volume in order to increase the blue light component in the spectrum of the light emitted by the high-pressure discharge lamp according to the invention.
  • the weight fraction of indium iodide is less than or equal to 0.6 micrograms per 1 mm 3 discharge vessel volume, and more preferably the weight fraction of indium iodide is in the range of 0.1 microgram to 0.5 microgram, and most preferably in the range of 0.1 microgram to 0.3 microgram per 1 mm 3 discharge vessel volume to allow white light with high color temperature.
  • the discharge vessel of the high-pressure discharge lamp according to the invention preferably has a volume in the value range from 17 mm 3 to 27 mm 3 and particularly preferably in the value range from 18 mm 3 to 27 mm 3, very particularly preferably in the value range from 18 mm 3 to 25 mm 3 . Even more preferred is a value range of 20 mm 3 to 25 mm 3 for the volume of the discharge vessel.
  • the inner diameter of the discharge vessel preferably has a value in the range of 1.8 mm to 3.1 mm in the region of the discharge space and particularly preferably a value in the value range of 2.1 mm to 2.8 mm.
  • the diameter of the electrodes of the high-pressure discharge lamp according to the invention is advantageously in the range of 0.25 millimeters to 0.38 millimeters. Electrodes having a thickness in this range of values can still be embedded sufficiently reliably in the quartz glass of the discharge vessel and at the same time have sufficient current-carrying capacity, which is particularly important during the so-called start-up phase of the high-pressure discharge lamp, during which it measures 2 to 5 times its rated power and rated current is operated.
  • the length of the electrodes is preferably in the value range from 6.0 mm to 9.0 mm and particularly preferably in the value range from 7.2 mm to 8.5 mm, to maximize the distance between the Molybdänfolienabdichtitch the discharge arc and a small size of the high-pressure discharge lamp guarantee.
  • the gas discharge electrodes of the high-pressure discharge lamp according to the invention are each connected to a molybdenum foil embedded in a sealed end of the discharge vessel and the distance of the molybdenum foil to the discharge end of the gas discharge electrode connected to it is in each case from 6.0 mm to 7.2 mm and preferably a value in the range of 6.2 mm to 7.2 mm. This ensures a large distance between the molybdenum foils and the discharge medium and reduces the risk of corrosion of the molybdenum foils by the metal iodides in the discharge medium.
  • the gas discharge electrodes may each be surrounded by a helix on an electrode section arranged in the sealed end of the discharge vessel, as for example in the documents WO 2010/043490 A1 or WO 2006/058513 A1 is disclosed in order to further reduce the aforementioned risk of corrosion and the occurrence of cracks in the discharge vessel.
  • the preferred embodiment of the invention is a mercury-free metal halide high pressure discharge lamp having a nominal electrical power consumption of 35 watts.
  • This lamp is intended for use in a motor vehicle headlight. It has a two-sided sealed discharge vessel 10 made of quartz glass with a volume of 22.5 mm 3 , in which a discharge medium is sealed gas-tight.
  • the discharge vessel 10 has a discharge space 106 and two diametrically arranged gas-tight ends 101, 102.
  • the inner contour of the discharge vessel 10 is circular-cylindrical and its outer contour is ellipsoidal.
  • the inner diameter of the discharge vessel 10 in the region of the discharge space 106 is 2.5 mm and its maximum, measured perpendicular to the discharge vessel longitudinal axis in the region of the discharge space 106 outer diameter is 6.5 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 6.5 mm, a width of 2 mm and a thickness of 25 microns.
  • the electrodes 11, 12 are made of tungsten or tungsten doped with thorium or thorium oxide. Their thickness or their diameter is 0.33 mm. The length of the electrodes 11, 12 is in each case 8.0 mm. The distance between the electrodes 11, 12 is 2.6 mm and their optically effective distance is 3.1 mm.
  • optically effective distance refers to the distance between the electrodes, 11, 12, as shown the discharge-side ends of the electrodes 11, 12 is effective through the vessel wall of the discharge space 106 in the vehicle headlamp.
  • the aforementioned vessel wall acts as an optical lens, so that the optically effective distance of the electrodes 11, 12 is greater than their actual or geometric distance.
  • the optically effective distance is determined by the spacing of the electrodes 11, 12, the refractive index of the discharge vessel material and the shape of the discharge vessel wall in the region of the discharge space 106.
  • distance of the electrodes always denotes the geometric distance between the electrodes and not the optically effective distance of the electrodes.
  • 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 base-side power supply 14 to an electrical connection of the lamp base 15 which essentially consists of plastic.
  • the overlap between the electrode 11 and the molybdenum foil 103 bonded thereto is 1.3 mm.
  • the smallest distance between the molybdenum foil 103 and the end of the electrode 11 projecting into the interior of the discharge vessel 10 is 6.7 mm. That is, the distance of the molybdenum foil 103 to the discharge arc forming in the discharge vessel 10 during lamp operation is 6.7 mm.
  • An analogous statement applies to the molybdenum foil 104 and the electrode 12.
  • the electrodes 11, 12 can optionally each with an electrode shaft coil (not shown) according to the published patent applications WO 2010/043490 A1 or WO 2006/058513 A1 be provided to minimize the risk of cracks occurring in the discharge vessel.
  • 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 part 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 extends over approximately 5 However, 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 that it increases 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 a selective heating of the colder, during lamp operation below the electrodes lying areas 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 radiation absorbing materials such as ceria and titania. Suitable glass compositions for the outer envelope are in the EP 0 700 579 B1 disclosed.
  • the discharge medium enclosed in the discharge vessel 10 consists of xenon with a cold filling pressure, that is to say a filling pressure of 1.75 megapascals measured at a temperature of 22 ° C., and of iodides of the metals sodium, scandium, zinc and indium.
  • the weight fractions of the abovementioned metal iodides in the discharge medium are, in each case based on 1 mm 3 of the discharge vessel volume, listed below in the unit micrograms (pg) per cubic millimeter (mm 3 ).
  • iodide 2.0 ⁇ g / mm 3 indium: 0.2 ⁇ g / mm 3
  • the color temperature of the light emitted by the metal halide high-pressure discharge lamp is 4500 Kelvin.
  • the high-pressure metal halide high-pressure discharge lamp according to the invention is operated immediately after the ignition of the gas discharge in the discharge vessel at two 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 path, to be determined solely by the xenon.
  • a quasi-stationary operating state of the lamp is reached, in which the lamp with its rated power of 35 watts and over the life with a burning voltage of about 30 - 60 volts is operated.
  • burning voltage therefore refers to the operating voltage of the high-pressure discharge lamp in quasi-stationary operation. It corresponds to the voltage drop over the discharge arc of the high pressure discharge lamp in quasi-stationary operation.
  • the weight proportions of the components of the discharge medium can be varied within the abovementioned limits in order to change the color temperature of the light emitted by the high-pressure discharge lamp or the burning voltage.
  • the xenon cold filling pressure can be varied within the limits mentioned above.
  • the invention may also be applied to high pressure discharge lamps having a nominal electrical power consumption of 25 watts.
  • the invention may also be applied to variable output high pressure discharge lamps in the range, for example, of nominally 25 watts to 35 watts.
  • the invention can also be applied to high-pressure discharge lamps which can be operated with two or more different discrete power stages, for example with 25 W and 35 W.
  • an ignition device for example a pulse ignition device, for igniting the gas discharge in the high-pressure discharge lamp or in addition to the ignition device, a complete operating device for operating the high-pressure discharge lamp can be arranged.

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  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP14793861.7A 2013-11-20 2014-11-06 Hochdruckentladungslampe für kraftfahrzeugscheinwerfer Not-in-force EP3072146B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013223708.1A DE102013223708A1 (de) 2013-11-20 2013-11-20 Hochdruckentladungslampe für Kraftfahrzeugscheinwerfer
PCT/EP2014/073959 WO2015074892A1 (de) 2013-11-20 2014-11-06 Hochdruckentladungslampe für kraftfahrzeugscheinwerfer

Publications (2)

Publication Number Publication Date
EP3072146A1 EP3072146A1 (de) 2016-09-28
EP3072146B1 true EP3072146B1 (de) 2019-04-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14793861.7A Not-in-force EP3072146B1 (de) 2013-11-20 2014-11-06 Hochdruckentladungslampe für kraftfahrzeugscheinwerfer

Country Status (4)

Country Link
EP (1) EP3072146B1 (zh)
CN (1) CN105765694B (zh)
DE (1) DE102013223708A1 (zh)
WO (1) WO2015074892A1 (zh)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130038207A1 (en) * 2010-04-22 2013-02-14 Koninklijke Philips Electronics N.V. Mercury-free high intensity gas-discharge lamp

Family Cites Families (10)

* 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
DE10312290A1 (de) 2003-03-19 2004-09-30 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe für Fahrzeugscheinwerfer
JP4086158B2 (ja) * 2003-12-22 2008-05-14 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
DE102004024063A1 (de) 2004-05-13 2005-12-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Hochdruckentladungslampe
EP1632985B1 (de) 2004-09-07 2014-06-25 OSRAM GmbH Hochdruckentladungslampe
DE102004057906A1 (de) 2004-11-30 2006-06-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH 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
DE102008057703A1 (de) * 2008-11-17 2010-05-20 Osram Gesellschaft mit beschränkter Haftung Quecksilberfreie Entladungslampe
DE102009052624A1 (de) * 2009-11-10 2011-05-12 Osram Gesellschaft mit beschränkter Haftung Einseitig gesockelte Hochdruckentladungslampe
DE102010063755A1 (de) * 2010-12-10 2012-06-14 Osram Ag Hochdruckentladungslampe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130038207A1 (en) * 2010-04-22 2013-02-14 Koninklijke Philips Electronics N.V. Mercury-free high intensity gas-discharge lamp

Also Published As

Publication number Publication date
DE102013223708A1 (de) 2015-05-21
WO2015074892A1 (de) 2015-05-28
EP3072146A1 (de) 2016-09-28
CN105765694B (zh) 2018-07-20
CN105765694A (zh) 2016-07-13

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