EP2347430A1 - Lampe à décharge sans mercure - Google Patents
Lampe à décharge sans mercureInfo
- Publication number
- EP2347430A1 EP2347430A1 EP09782856A EP09782856A EP2347430A1 EP 2347430 A1 EP2347430 A1 EP 2347430A1 EP 09782856 A EP09782856 A EP 09782856A EP 09782856 A EP09782856 A EP 09782856A EP 2347430 A1 EP2347430 A1 EP 2347430A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge
- discharge lamp
- lamp according
- watts
- space
- 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
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
- H01J61/12—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 headlights, is operated with a power of less than 35 watts, with a light-transmitting discharge vessel, in the discharge space electrodes for generating a gas discharge protrude, wherein Discharge space metal halides and a starting gas are present.
- the abovementioned value for the power refers here to the quasi-stationary operation of the mercury-free metal halide high-pressure discharge lamp, that is to say after completion of its ignition and starting phase, when the metal halides in the discharge space of the lamp have completely evaporated. 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 emitted by a conventional mercury-free discharge lamp, is required to additionally provide a headlamp 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.
- This object is achieved by a discharge lamp with a power of less than 35 watts, that is with an electrical power consumption less than 35 watts during their operation after completion of their ignition and start-up phase, in which in a light-transmitting discharge vessel, in the discharge space electrodes for generating protrude a gas discharge, wherein metal halides and a starting gas are present in the discharge space.
- metal halides instead of the usual 10 mg / ml to 30 mg / ml concentration for the metal halides, according to the invention metal halides only in a capacity of 5 mg / ml to 15 mg / ml, that is 5 milligrams to 15 milligrams of metal halide per 1 milliliter volume of the discharge space in the discharge space of the discharge vessel introduced
- this 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 35 watts.
- Another factor influencing the power requirement and the emitted luminous flux is the thermal characteristics of the lamp.
- the discharge space is usually surrounded by an outer bulb which, filled with air, has a certain, albeit not good, thermal insulation of the discharge. represents a space.
- an outer bulb which, filled with air, has a certain, albeit not good, thermal insulation of the discharge. represents a space.
- a gas or gas mixture with lower thermal conductivity than air is introduced into a gap defined by the outer bulb and the discharge vessel.
- 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. Since, as described above, 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. For example, 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 to 16 mm 3 to 34 mm 3 are defined in order to throttle the power consumption 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, whereby also the temperature in the discharge space and thus the power requirement of Discharge lamp can be influenced.
- 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 Im and / or has a power requirement of less than 30 watts, in particular 15 watts to 25 watts.
- the aforesaid value range for the power relates to the quasi-stationary operation of the mercury-free metal halide high-pressure discharge lamp, that is to say after the end of its ignition and starting phase, when the metal halides have 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, in order 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 preferably 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 particularly preferably at 2, 5 lies.
- the metal halides contained in the discharge space of the discharge lamp according to the invention also comprise indium halide for the same purpose in a proportion in the range from 2 percent by weight to 4 percent by weight.
- xenon with a cold filling pressure in the range from 10 bar to 18 bar is preferably used as ignition gas in order to ensure an immediate emission of white light after 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.
- Figure 1 is a schematic representation of a longitudinal cross-section through a mercury-free discharge lamp according to the preferred embodiments of the invention.
- FIG. 2 shows a graphic comparative illustration for two lamps with different outer bulb filling gases, wherein the maximum external bulb temperature in degrees Celsius is plotted on the vertical axis and the electrical power consumption of the lamp is plotted in watts on the horizontal axis.
- 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.
- the discharge space of the discharge vessel has a volume in the range of 16 mm 3 to 34 mm 3 , wherein in particular 17 mm 3 to 22 mm 3 are particularly preferred.
- the discharge space has a volume of 20.0 mm 3 , in which an ionizable filling is enclosed in a gas-tight manner.
- the inner contour of the discharge vessel 10 is advantageously circular-cylindrical and its outer contour ellipsoidal in shape.
- 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 space 106 is 2.4 mm and its outer diameter is 6, 0mm.
- 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 coating 107 acting as an ignition aid are described in EP 1 632 985 A1.
- 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 bulb glass are disclosed in EP 0 700 579 B1. Beard.
- light-emitting metal halides and buffer metal halides as well as xenon are included in the discharge space 106 as gas-tight start-up gas.
- the light-emitting metal halides which primarily fulfill the function of light emission may, for example, be a compound 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 be located in the region of the discharge Furthermore, the space 106 along its longitudinal axis has smaller internal dimensions 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 (smaller than 4.2 mm, according to 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 approximately 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 lamps of FIG the state of the art, which are operated at 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, if 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 according to the prior art), the light-emitting metal halide can be used. do not condense lignide 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 intermediate space was filled or evacuated with various gases.
- D4 lamp mercury-free metal halide high-pressure discharge lamp
- the applied power in watts is shown on the horizontal axis in Figure 2, while the vertical axis, 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.
- 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
- graph 6 the measured values with evacuated outer bulb.
- the filling with air shows a greater thermal conductivity and thus also 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.
Landscapes
- Discharge Lamp (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
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 true EP2347430A1 (fr) | 2011-07-27 |
EP2347430B1 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)
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 |
US8836217B2 (en) * | 2011-06-23 | 2014-09-16 | Toshiba Lighting & Technology Corporation | Mercury-free metal halide lamp for vehicle and metal halide lamp device |
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)
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 |
-
2008
- 2008-11-17 DE DE102008057703A patent/DE102008057703A1/de not_active Withdrawn
-
2009
- 2009-09-10 US US13/129,581 patent/US8736165B2/en not_active Expired - Fee Related
- 2009-09-10 EP EP09782856.0A patent/EP2347430B1/fr not_active Not-in-force
- 2009-09-10 WO PCT/EP2009/061736 patent/WO2010054872A1/fr active Application Filing
- 2009-09-10 ES ES09782856.0T patent/ES2493691T3/es active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010054872A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20110248628A1 (en) | 2011-10-13 |
EP2347430B1 (fr) | 2014-06-25 |
DE102008057703A1 (de) | 2010-05-20 |
US8736165B2 (en) | 2014-05-27 |
ES2493691T3 (es) | 2014-09-12 |
WO2010054872A1 (fr) | 2010-05-20 |
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