EP2191494A1 - High-pressure discharge lamp with partial coating and vehicle headlight comprising said lamp - Google Patents
High-pressure discharge lamp with partial coating and vehicle headlight comprising said lampInfo
- Publication number
- EP2191494A1 EP2191494A1 EP08804350A EP08804350A EP2191494A1 EP 2191494 A1 EP2191494 A1 EP 2191494A1 EP 08804350 A EP08804350 A EP 08804350A EP 08804350 A EP08804350 A EP 08804350A EP 2191494 A1 EP2191494 A1 EP 2191494A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- discharge lamp
- pressure discharge
- lamp according
- discharge
- 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
- H01J61/30—Vessels; Containers
- H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
Definitions
- the invention relates to a high-pressure discharge lamp, in particular for a vehicle headlight, having at least one discharge vessel and two electrodes extending into a discharge space of the discharge vessel, between which a light-emitting discharge arc is formed during operation of the high-pressure discharge lamp.
- the invention further relates to a vehicle headlight provided with at least one such high-pressure discharge lamp.
- Such a high-pressure discharge lamp is, for example, on the Internet domain www.osram.de described.
- These conventional discharge lamps have a discharge vessel which defines a space filled with an ionizable filling discharge space in which two electrodes extend, with the energy supply under the product name "XENARC ®" are connected out of the discharge vessel lead leads and generate a gas discharge during operation of the lamp, which forms a light-emitting discharge arc.
- DE 10 2004 043 636 A1 discloses, for example, a high-pressure discharge lamp in which an electrically conductive, light-transmitting layer is used as at least partially coating is applied to the surface of the discharge vessel.
- This coating together with the electrodes and possibly with the power supply lines, forms a capacitor, with the glass of the discharge vessel in between and the filling gas in the discharge space forming the dielectric of this capacitor.
- a dielectrically impeded discharge is generated in the discharge space between the electrodes and the coating.
- This dielectrically impeded discharge generates a sufficient number of free charge carriers in the discharge space in order to enable the electrical breakdown between the two electrodes of the high-pressure discharge lamp or to considerably reduce the ignition voltage required for this purpose.
- a disadvantage of such high-pressure discharge lamps is that the color temperature and luminance of the discharge arc over the length of the discharge arc is uneven, so that light emitted by the lamp, in particular when using such high-pressure discharge lamps in vehicle headlights, can lead to dazzling other road users.
- so-called hot spots in the discharge space of such lamps which have an extremely high color temperature, lead to dazzling of oncoming vehicles.
- the invention is based on the object, a high-pressure discharge lamp and a vehicle headlamp with at least one such high-pressure discharge lamp create, in which compared to conventional solutions an improved lighting effect is possible.
- a high-pressure discharge lamp having at least one discharge vessel and two electrodes extending into a discharge space of the discharge vessel, between which a light-emitting discharge arc is formed during operation of the high-pressure discharge lamp, on a peripheral surface of the lamp in the region of a discharge-space-side end section at least one of the electrodes has a luminance and color temperature of the emitted light changing partial coating is applied. Furthermore, this object is achieved by a vehicle headlamp with at least one such high-pressure discharge lamp. Particularly advantageous embodiments of the invention are described in the dependent claims.
- the coating according to the invention of the high-pressure discharge lamp in the region of a discharge-chamber-side end section of at least one electrode it is achieved that the lamp appears more homogeneous in color and light and no longer or at least less dazzles other road users, for example oncoming motorists, since the luminance as well as the color temperature is changed by such a partial coating. Furthermore, by such a partial coating, the geometry of the actual luminous body can be set very accurately. As a result, for example, the reflector geometry of a headlight can be adapted much better to the discharge lamp, so that an improved lighting effect is achieved. According to a particularly preferred embodiment of the invention, the partial coating is formed as the luminance and color temperature of the emitted light degrading coating.
- the discharge vessel of the lamp is surrounded at least in sections by an outer bulb in a preferred embodiment of the invention.
- the coating it is possible for the coating to be applied to the outer peripheral surface of the outer bulb and / or to the outer circumferential surface of the discharge vessel.
- a coating applied to the outer circumferential surface of the outer bulb is thermally less stressed than a coating which is applied to the discharge vessel.
- the application of the coating on the outer surface of the discharge vessel has the advantage that the coating is protected against mechanical damage and undesired reactions of the coating can be prevented by means of a gas filling, in particular an inert gas filling, provided in the space between the outer bulb and the discharge vessel.
- the invention is not limited to such lamp types with outer bulb, but the high-pressure discharge lamp can be formed without an outer bulb having a coating applied to the discharge vessel.
- a coating is applied to the peripheral surface of the outer bulb and / or the discharge vessel.
- the coating is applied at least to a circumferential section of the outer bulb and / or of the discharge vessel.
- the coating extends annularly around the outer bulb and / or the discharge vessel.
- the coating forms an annular covering of the very bright, white hot spots with a high color temperature, so that the light effect of the lamp is color and light-homogenous.
- the coating is applied to the outer bulb or the discharge vessel such that it encompasses the end portion of the electrode at a distance. It has proved to be particularly advantageous if the coating is applied in each case beginning approximately 0.2 to 1.2 mm, preferably 0.5 mm, in front of the discharge-chamber-side end section of the electrode and extending in the direction of an end section of the discharge vessel.
- the coating preferably extends in each case from the discharge space at least to a melting of the electrode in the discharge vessel of the high-pressure discharge lamp.
- the coating is applied in each case from one end of the electrode beginning on the outer bulb or the discharge vessel and extends in the direction of the end portions of the discharge vessel.
- At least some of the radiation emitted in the region of the ends of the electrodes is not detected by the coating, so that a very high luminance is achieved.
- this is preferably applied in mask or glare technique.
- a coating according to the invention preferably has at least one absorption filter, an interference filter and / or a combination of such filters.
- absorption or partial absorption of the light emitted by the discharge arc can be achieved.
- an interference filter arrangement it is possible in particular to filter light in an undesired wavelength range causing a glare from the emission spectrum of the discharge lamp.
- the coating is applied to the outer bulb and / or the discharge vessel by means of a vacuum coating method.
- a coating with a defined layer thickness and high adhesion is achieved. It is advantageous that the vacuum coating process proceeds continuously, ie no intermediate ventilation of the vacuum chamber occurs and thereby no contamination of the coating occur, so that the quality of the coating of the high pressure discharge lamp is substantially improved.
- the optical properties of the coating can be easily be adjusted by the material used, the layer geometry and thickness of the layer to achieve the desired improvements in the lighting effect.
- the coating may consist of one or more materials.
- the coating is applied in PVD sputtering or CVD technology.
- PVD sputtering or CVD technology.
- CVD chemical vapor deposition
- the uncoated portion of the outer peripheral surface of the outer bulb or of the discharge vessel preferably has a sufficiently high luminance in order to achieve the illuminance required in accordance with the ECE standard.
- Figure 1 is a schematic representation of a high-pressure discharge lamp according to the invention.
- FIG. 2 shows a schematic representation of the high-pressure discharge lamp from FIG. 1 in the region of the discharge chamber with discharge arc.
- the invention will be explained below with reference to a high-pressure discharge lamp, as used for example in vehicle headlights.
- the high-pressure discharge lamp according to the invention is by no means limited to such lamp types.
- FIG. 1 shows a schematic representation of a high-pressure discharge lamp 1 with a discharge vessel 2 (burner) made of quartz glass which delimits a discharge space 4 and has two diametrically arranged, sealed end sections 6, 8 in each of which a molybdenum foil 10 is embedded for gas-tight current feedthrough.
- the molybdenum foils 10 are connected on a first narrow side 12 to an outer power supply 14, 16 made of dosed molybdenum.
- In the discharge space 4 of the discharge vessel 2 protrude two diametrically arranged electrodes 18, 20 made of doped tungsten, which are each connected to a second narrow side 22 of the molybdenum foils 10 and between which a light-emitting gas discharge is formed during lamp operation.
- an ionizable filling is included, which consists of high-purity xenon gas and a plurality of metal halides.
- the discharge vessel 2 is surrounded by an outer bulb 24, which consists of quartz glass, which is provided with ultraviolet radiation absorbing dopants.
- the high-pressure discharge lamp 1 also has a lamp cap 26, which carries the discharge vessel 2 and the outer bulb 24.
- the lamp base 26 has a partially cylindrical base housing 28 made of electrically insulating synthetic material. Substance for receiving in a lamp holder, not shown, the lamp side has a mounting portion 30 with a fixing ring 32 for fixing the outer bulb 24 in the base housing 28.
- the outer power supply 14 of the socket-distal end portion 6 of the discharge vessel 2 is connected via an insulative sleeve 34 current return 36 to an electrical connection ring 38 of the base 26, while the sockelnahe power supply 16 is connected to an inner contact pin, not shown, of the high-pressure discharge lamp 1 ,
- each of the electrodes 18, 20 is provided with a partial coating 44 which alters the luminance and color temperature of the emitted light.
- the coatings 44 are each approximately annularly applied to the outer bulb 24 such that they surround the end portions 42 of the electrodes 18, 20 spaced and extend to a fusion 48 of the E- electrodes 6, 8 in the discharge vessel 2. Because of the coatings 44 of the high-pressure discharge lamp 1 according to the invention, it is achieved that the lamp does not appear stained and luminous, and other road users, for example oncoming motorists no longer or at least less dazzle, since the luminance as well as the color temperature is lowered by such a partial coating 44.
- the geometry of the actual luminous body can be set very accurately.
- the reflector geometry of a headlight much better adapted to the discharge lamp 1, so that an improved lighting effect is achieved.
- the attachment of the coating 44 on the outer peripheral surface 40 of the outer piston 24 is subjected to a lower thermal load than a coating applied to the discharge vessel 2.
- An uncoated portion 46 of outer peripheral surface 40 of outer bulb 24 has a sufficiently high luminance to achieve the illuminance required by ECE for street illumination.
- the coating 44 is applied to the discharge vessel 2.
- the application of the coating 44 on the outer peripheral surface of the discharge vessel 2 has the advantage that the coating 44 is protected against mechanical damage and undesirable reactions of the coating can be prevented by means of a gas filling provided in the space between the outer bulb and the discharge vessel, in particular an inert gas filling ,
- the coating 44 may each be applied from one end of the electrodes 18, 20 starting on the outer bulb 24 or the discharge vessel 2 and extending in the direction of the end portions 6, 8 of the discharge vessel 2.
- the coating 44 has at least one absorption filter, an interference filter and / or a combination of such filters and, in the illustrated exemplary embodiment, is applied to the outer bulb 24 by means of a vacuum coating method.
- a vacuum coating method In order to influence the position and geometry of the coating 44 is these applied, for example, in mask or glare technique.
- a coating having a defined layer thickness and high adhesive strength is achieved. It is advantageous that the vacuum coating process is continuous, ie no intermediate ventilation of the vacuum chamber takes place and thereby no contamination of the coating occur, so that the quality of the coating of the high-pressure discharge lamp 1 is substantially improved.
- the optical properties of the coating 44 can be easily adjusted by the material used, the layer geometry and the thickness of the layer in order to achieve the desired improvements in the lighting effect.
- the coating can consist of different materials. For example, the coating can be applied in PVD sputtering or CVD technology.
- the coating 44 in the exemplary embodiment illustrated extends in each case from a distance X of approximately 0.2 to 1.2 mm, preferably 0.5 mm in front of the discharge space-side end portions 42 of the electrodes 18, 20 starting in the direction of the end sections 6, 8 of the discharge vessel 2 (see FIG. 1).
- the coating 44 forms an annular covering of the very bright white hot spots 52 having a high color temperature which occur in the edge region of the electrodes 18, 20, so that the light effect of the lamp is color and light-homogenous.
- the arc length L is in the illustrated embodiment of the invention about 5 mm.
- a central Area 54 of the discharge arc 50 having the width T has at least about 50% of the maximum luminance.
- a portion 56 of the discharge arc 50 having a width T is characterized by a luminance of at least about 20% of the maximum luminance, wherein a center 58 of the luminance is spaced a distance R from a reference axis 60.
- the high-pressure discharge lamp 1 according to the invention is not limited to lamps with outer bulb 24, but rather the high-pressure discharge lamp without an outer bulb
- the geometry of the coating 44 is not limited to the mentioned exemplary embodiment.
- the coating can be executed with coated on the discharge vessel 2 coating 44.
- Outer bulb 24 or the discharge vessel 2 may be applied.
Landscapes
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007046559A DE102007046559A1 (en) | 2007-09-28 | 2007-09-28 | High-pressure discharge lamp with partial coating and vehicle headlights with such a lamp |
PCT/EP2008/062406 WO2009043726A1 (en) | 2007-09-28 | 2008-09-18 | High-pressure discharge lamp with partial coating and vehicle headlight comprising said lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2191494A1 true EP2191494A1 (en) | 2010-06-02 |
EP2191494B1 EP2191494B1 (en) | 2011-08-10 |
Family
ID=40276017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08804350A Not-in-force EP2191494B1 (en) | 2007-09-28 | 2008-09-18 | High-pressure discharge lamp with partial coating and vehicle headlight comprising said lamp |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100194264A1 (en) |
EP (1) | EP2191494B1 (en) |
JP (1) | JP5101700B2 (en) |
CN (1) | CN101809707A (en) |
AT (1) | ATE520146T1 (en) |
DE (1) | DE102007046559A1 (en) |
WO (1) | WO2009043726A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5343768B2 (en) * | 2009-09-01 | 2013-11-13 | ウシオ電機株式会社 | High pressure discharge lamp |
DE102011076212A1 (en) * | 2011-05-20 | 2012-11-22 | Osram Ag | DISCHARGE LAMP |
US9607821B2 (en) * | 2011-09-13 | 2017-03-28 | Osram Sylvania Inc. | Modified spectrum incandescent lamp |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6087156U (en) * | 1983-11-16 | 1985-06-15 | 東芝ライテック株式会社 | small metal halide lamp |
JP2974193B2 (en) * | 1992-05-15 | 1999-11-08 | 松下電子工業株式会社 | Metal halide lamps for automotive headlights |
US5708328A (en) * | 1992-06-03 | 1998-01-13 | General Electric Company | Universal burn metal halide lamp |
DE682356T1 (en) | 1994-05-12 | 1996-05-02 | Iwasaki Electric Co Ltd | Metal halide lamp. |
JPH1196974A (en) * | 1997-09-18 | 1999-04-09 | Iwasaki Electric Co Ltd | Metal halide lamp with transparent heat insulating film |
JP3603723B2 (en) * | 1999-03-26 | 2004-12-22 | 松下電工株式会社 | Metal halide lamp and discharge lamp lighting device |
EP1168417A1 (en) * | 2000-06-26 | 2002-01-02 | General Electric Company | Incandescent lamp with an IR reflective coating and a fully reflective end coating |
DE10204691C1 (en) * | 2002-02-06 | 2003-04-24 | Philips Corp Intellectual Pty | Mercury-free, high-intensity, high pressure gas discharge lamp for vehicle headlights, has infra-red reflecting coating on lower wall to promote vaporization |
DE10222954A1 (en) * | 2002-05-24 | 2003-12-04 | Philips Intellectual Property | High-pressure gas discharge lamp |
DE10247983A1 (en) | 2002-07-23 | 2004-02-05 | Philips Intellectual Property & Standards Gmbh | lamp |
JP2004220867A (en) | 2003-01-10 | 2004-08-05 | Koito Mfg Co Ltd | Discharging bulb |
DE102004043636A1 (en) | 2004-09-07 | 2006-03-09 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Mercury-free halogen metal-vapor high-pressure discharge lamp for vehicle headlight, has discharge vessel provided partially with coating, so that capacitive coupling is produced between coating and electrode and/or power supply lines |
JP2006134656A (en) * | 2004-11-04 | 2006-05-25 | Harison Toshiba Lighting Corp | Metal halide lamp |
JP2007026921A (en) * | 2005-07-19 | 2007-02-01 | Koito Mfg Co Ltd | Discharge bulb for automobile |
-
2007
- 2007-09-28 DE DE102007046559A patent/DE102007046559A1/en not_active Withdrawn
-
2008
- 2008-09-18 CN CN200880108660A patent/CN101809707A/en active Pending
- 2008-09-18 EP EP08804350A patent/EP2191494B1/en not_active Not-in-force
- 2008-09-18 AT AT08804350T patent/ATE520146T1/en active
- 2008-09-18 JP JP2010526247A patent/JP5101700B2/en not_active Expired - Fee Related
- 2008-09-18 US US12/679,683 patent/US20100194264A1/en not_active Abandoned
- 2008-09-18 WO PCT/EP2008/062406 patent/WO2009043726A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009043726A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009043726A1 (en) | 2009-04-09 |
US20100194264A1 (en) | 2010-08-05 |
CN101809707A (en) | 2010-08-18 |
DE102007046559A1 (en) | 2009-04-02 |
JP5101700B2 (en) | 2012-12-19 |
EP2191494B1 (en) | 2011-08-10 |
JP2010541142A (en) | 2010-12-24 |
ATE520146T1 (en) | 2011-08-15 |
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