CA2280556A1 - High-pressure discharge lamp and associated illuminating system - Google Patents
High-pressure discharge lamp and associated illuminating system Download PDFInfo
- Publication number
- CA2280556A1 CA2280556A1 CA 2280556 CA2280556A CA2280556A1 CA 2280556 A1 CA2280556 A1 CA 2280556A1 CA 2280556 CA2280556 CA 2280556 CA 2280556 A CA2280556 A CA 2280556A CA 2280556 A1 CA2280556 A1 CA 2280556A1
- Authority
- CA
- Canada
- Prior art keywords
- discharge lamp
- pressure discharge
- coating
- lamp
- discharge vessel
- 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.)
- Abandoned
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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
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
High-pressure discharge lamp and associated illuminating system A high-pressure discharge lamp having an axial axis of symmetry has on the discharge vessel (2) an asymmetrically reflecting coating (4) in the region of the cold spot, as a result of which the lighting data are improved.
Description
Attorney Docket No.: 98P5548 High-pressure discharge lamp and associated illuminating system Technical Field The invention proceeds from a high-pressure discharge lamp in accordance with the preamble of claim 1. It relates in particular in this case to a metal halide lamp with a two-end pinch, above all of high power.
Prior Art The printed publication DE-A 44 43 354 has already disclosed a high-pressure discharge lamp which has a radially asymmetric coating of the bulb. An aperture lamp is referred to in this case. This means that an increased emission is achieved from a noncovered narrow bulb region by providing the remaining bulb surface with a reflecting coating. The coating in this case covers a substantial part of the bulb surface.
Axially asymmetric coatings of the bulb have been described in various ways.
For example, DE-U 94 O1 436 has disclosed a metal halide lamp which is pinched at two ends and is installed axially in a reflector in order to achieve a high luminous flux and a high uniformity in the emission. In addition to the known heat-2 5 concentration spherical caps at the ends, this lamp also uses as radially symmetric layer a completely circumferential annulus in the middle of the bulbous discharge vessel.
Summary of the invention It is the object of the present invention to provide a high-pressure discharge lamp in accordance with the preamble of claim 1 in which the vi~all loading of the discharge vessel, and thus the temperature of the cold spot, is increased.
This object is achieved by means of the characterizing features of claim 1.
Particularly advantageous refinements are to be found in the dependent claims.
Attorney Docket No. 98P5548 A high wall loading increases the proportion of the filling substances in the discharge arc and is therefore desired, because thereby the electrical and lighting data of the lamp are substantially improved.
An improvement in these data has so far been attempted by changing the composition of the filling substance and reducing the volume of the discharge vessel. To date, this has meant a high outlay on development in conjunction with an uncertain result. However, it has not as yet been possible thereby to set the light distribution curve of the lamp.
According to the invention, a radially asymmetric reflecting coating is applied to an essentially radially symmetric discharge vessel (which is, therefore, essentially circularly cylindrical in the radial direction). This coating is applied in a locally limited region which includes the cold spot, and has a limited extent whose size is preferably between 5 and 40% of the surface of the discharge vessel, in order to keep the shading as low as possible.
This reflecting coating can be produced by means of a physical and/or chemical treatment of the surface of the discharge vessel. For example, a coating known per 2 0 se with metallic (aluminum) or nonmetallic materials (in particular zirconium oxide), or a layer produced by means of sandblasting or etching is suitable.
By selecting the layer geometry and the coating method, the lamp-specific data of in particular the color rendition, color temperature and light distribution curve as well as the color locus can be varied and set exactly as desired.
This improvement in the electrical and lighting data is achieved by means of a specific asymmetric coating of the discharge vessel in the region of the cold spot.
Particularly large improvements are achieved in the case of high-power (at least 400 W to power far in excess of 1000 W) metal halide lamps without outer bulb, 3 0 since here the heat loss is particularly critical because of the lack of the outer bulb.
The cold spot in these lamps is normally to be found behind the electrodes.
For this reason, the ends of the discharge vessel are frequently fitted with heat-concentration spherical caps. The effect of this is that the cold spot (which then, 3 5 however, is at a higher temperature than when a spherical cap is dispensed with) is to be found at the deepest point of the discharge vessel, something which is conditioned by the effect of gravity. The point is that the discharge arc is deflected Attorney Docket No. 98P5548 upward by the lift. A discharge vessel which is as isothermal as possible is desired.
The dimension of the cold region about the cold spot (and consequently the temperature gradient) in this case determines the extent of the asymmetric coating.
This can either be a limited spot or axially elongated, for example like a strip. The spot is round or oval or elliptical.
In some circumstances, the geometrical arrangement of the asymmetric coating is determined by an associated illuminating system (for example a luminaire) since this system can influence the position and the dimension of the cold region about the cold spot. The constituent of an illuminating system which is essential for this purpose is mostly a reflector which, for example, is constructed as a trough reflector or ellipsoidal reflector.
The position of the asymmetric coating can advantageously be defined relative to the exhaust tip of the discharge vessel, since this is best positioned upward during operation of the lamp as a potential heat sink. Consequently, the asymmetric coating is fitted exactly opposite the exhaust tip. For practical reasons, as well, no coating is desired in the region of the exhaust tip, in order to avoid distortions and adhesive problems of the coating at the exhaust tip.
The lamp is preferably operated in a horizontal mounting position (referred to the longitudinal axis) and is distinguished by a coating which extends in the axial direction at least over 30% of the length of the discharge volume and which extends in the radial direction over at least a center angle of 30°
with the lowest 2 5 point of the discharge vessel as the middle of the center angle. The maximum length of the coating in the axial direction is limited by the overall length of the discharge vessel, and is limited in the radial direction by a center angle of at most 180°, since otherwise the effect of the shading would be too great. In this case, a circular shape or elliptical shape which is close to the circular shape is assumed in 3 0 the radial direction for the cross section of the discharge vessel. In the axial direction, the discharge vessel is elongated and preferably has the shape either of a body of a barrel, a cylinder or an ellipse.
The asymmetric coating preferably stretches to near the ends of the discharge 3 5 volume, where the electrodes are seated. In this case, the known heat-concentration spherical cap can be constructed additionally at both ends.
Attorney Docket No. 98P5548 Suitable above all as illuminating system is a wall luminaire which has an elongated reflector fitted laterally behind the horizontal lamp. This prevents the asymmetric coating from causing an appreciable shading of the radiation emitted by the luminaire.
The coating according to the invention renders it possible to raise the lighting data of a lamp without large changes to other parameters. It is even possible to use the same reflector paste as is already used for the end silvering. Again, there are no extra costs in the production, since no additional process step is required.
The extra consumption of the reflector paste can be neglected.
A particularly valuable and environmentally friendly point of view is that, because of the higher operating temperature, it is possible to reduce by approximately mg the absolute quantity of Hg required to fill a lamp. Apart from this, there is 15 no need for any change in the composition of the filling for the purpose of improving lighting data.
In order to ensure the required unambiguous orientation of the lamp in the correct operating position, it is possible to fall back on a known orientatable base/holder 2 0 system such as is described, for example, in US-A 5 731 656. It is possible thereby to ensure very easily the installation position which is required to maintain an optimum effect and for which the asymmetric coating points downward.
Figures The invention is to be explained below in more detail with the aid of a plurality of exemplary embodiments. In the drawing:
Figure 1 shows a metal halide lamp in a side view, Figure 2 shows a cross section through the metal halide lamp of Figure 1 Figure 3 shows a further exemplary embodiment of a metal halide lamp in plan view of a pinch, and Figure 4 shows a side view, rotated by 90°, of the lamp from Figure 3.
Attorney Docket No. 98P5548 Description of the drawings Figures 1 and 2 represent diagrammatically a 2000 W high-pressure discharge lamp 1 without an outer bulb with a length of approximately 190 mm, such as is described in more detail, for example, in US-A 5 142 195. It is intended for use in reflectors although being now arranged horizontally and transverse to the reflector axis instead of axially.
The discharge vessel 2 made from silica glass defines a longitudinal axis X
and is designed as a barrel-shaped body whose generatrix is a circular arc. The discharge volume is approximately 20 cm3. The bar-shaped tungsten electrodes 6 with a filament pushed on are aligned axially in pinches 5 at both ends of the discharge vessel. The electrodes 6 are fastened in the pinch 5 on foils 8 at which outer supply leads 9 start. A ceramic base 10 is fastened with the aid of cement on the end of the pinch 5 remote from the discharge. The discharge vessel 2 contains a filling made from an inert gas, mercury (180 mg now suffices instead of approximately 200 mg) as well as metal halides. The ends of the discharge vessel are provided with a heat-concentration spherical cap 13 made from zirconium oxide.
2 0 In addition, an asymmetric coating 4 is applied to the discharge vessel 2, specifically opposite the exhaust tip 3 in the region which is situated lowest in the installed state and contains the cold spot T. The asymmetric coating 4 likewise consists of zirconium oxide and is an elongated, oval spot which has an axial width a of approximately 50% of the width of the barrel-shaped body. Its maximum radial extent covers a center angle of approximately a = 55° (see Figure 2). Only the front half of the spot is to be seen in the side view of Figure l, in which the exhaust tip 3 is at the top.
A further exemplary embodiment is shown in Figures 3 and 4. This is a 1000 W
3 0 metal halide lamp 19 similar to that described in Figure 1. Figure 3 shows a plan view of a pinch 23. The lamp 19 is seen from below in Figure 4. The asymmetric coating 20 extends over the entire axial length of the volume of the discharge vessel 21 and is connected at the ends to the heat-concentration spherical caps 22.
The radial extent corresponds to a center angle of approximately 90°.
The lamp is 3 5 intended for installation in a luminaire whose elliptical reflector 25 is seated laterally next to the lamp 19. The main direction of emission forward is represented by an arrow 26.
Attorney Docket No. 98P5548 The color locus, the color rendition and the luminous flux, in particular, are significantly improved by the asymmetric coating by comparison with the prior art.
Moreover the operating voltage of the lamp is raised on average by 20 V to approximately 125 V. A comparison between an uncoated and a coated lamp is to be found in Table 1, where the luminous flux ~ (in klm), the color coordinates x and y and the color rendition index Ra are given for both lamps. There is a substantial improvement in the luminous flux (by 7%) and the color rendition index (by 15%). The color locus is plainly closer to white (x,y=0.333) or to the curve for the Planckian radiator.
Attorney Docket No. 98P5548 _7_ Table 1 Uncoated lamp Coated lamp ~ (klm) 80.7 86.8 x 0.297 0.332 y 0.377 0.368 Ra 75 86 A wipe-resistant reflector paste based on zirconium oxide was used as coating material. Its layer thickness and homogeneity correspond to the usual value for heat-concentration spherical caps. The lamp was coated in a region about the cold spot at which filling condensate forms during operation. This region is situated in a special case on the side opposite the exhaust tip.
Prior Art The printed publication DE-A 44 43 354 has already disclosed a high-pressure discharge lamp which has a radially asymmetric coating of the bulb. An aperture lamp is referred to in this case. This means that an increased emission is achieved from a noncovered narrow bulb region by providing the remaining bulb surface with a reflecting coating. The coating in this case covers a substantial part of the bulb surface.
Axially asymmetric coatings of the bulb have been described in various ways.
For example, DE-U 94 O1 436 has disclosed a metal halide lamp which is pinched at two ends and is installed axially in a reflector in order to achieve a high luminous flux and a high uniformity in the emission. In addition to the known heat-2 5 concentration spherical caps at the ends, this lamp also uses as radially symmetric layer a completely circumferential annulus in the middle of the bulbous discharge vessel.
Summary of the invention It is the object of the present invention to provide a high-pressure discharge lamp in accordance with the preamble of claim 1 in which the vi~all loading of the discharge vessel, and thus the temperature of the cold spot, is increased.
This object is achieved by means of the characterizing features of claim 1.
Particularly advantageous refinements are to be found in the dependent claims.
Attorney Docket No. 98P5548 A high wall loading increases the proportion of the filling substances in the discharge arc and is therefore desired, because thereby the electrical and lighting data of the lamp are substantially improved.
An improvement in these data has so far been attempted by changing the composition of the filling substance and reducing the volume of the discharge vessel. To date, this has meant a high outlay on development in conjunction with an uncertain result. However, it has not as yet been possible thereby to set the light distribution curve of the lamp.
According to the invention, a radially asymmetric reflecting coating is applied to an essentially radially symmetric discharge vessel (which is, therefore, essentially circularly cylindrical in the radial direction). This coating is applied in a locally limited region which includes the cold spot, and has a limited extent whose size is preferably between 5 and 40% of the surface of the discharge vessel, in order to keep the shading as low as possible.
This reflecting coating can be produced by means of a physical and/or chemical treatment of the surface of the discharge vessel. For example, a coating known per 2 0 se with metallic (aluminum) or nonmetallic materials (in particular zirconium oxide), or a layer produced by means of sandblasting or etching is suitable.
By selecting the layer geometry and the coating method, the lamp-specific data of in particular the color rendition, color temperature and light distribution curve as well as the color locus can be varied and set exactly as desired.
This improvement in the electrical and lighting data is achieved by means of a specific asymmetric coating of the discharge vessel in the region of the cold spot.
Particularly large improvements are achieved in the case of high-power (at least 400 W to power far in excess of 1000 W) metal halide lamps without outer bulb, 3 0 since here the heat loss is particularly critical because of the lack of the outer bulb.
The cold spot in these lamps is normally to be found behind the electrodes.
For this reason, the ends of the discharge vessel are frequently fitted with heat-concentration spherical caps. The effect of this is that the cold spot (which then, 3 5 however, is at a higher temperature than when a spherical cap is dispensed with) is to be found at the deepest point of the discharge vessel, something which is conditioned by the effect of gravity. The point is that the discharge arc is deflected Attorney Docket No. 98P5548 upward by the lift. A discharge vessel which is as isothermal as possible is desired.
The dimension of the cold region about the cold spot (and consequently the temperature gradient) in this case determines the extent of the asymmetric coating.
This can either be a limited spot or axially elongated, for example like a strip. The spot is round or oval or elliptical.
In some circumstances, the geometrical arrangement of the asymmetric coating is determined by an associated illuminating system (for example a luminaire) since this system can influence the position and the dimension of the cold region about the cold spot. The constituent of an illuminating system which is essential for this purpose is mostly a reflector which, for example, is constructed as a trough reflector or ellipsoidal reflector.
The position of the asymmetric coating can advantageously be defined relative to the exhaust tip of the discharge vessel, since this is best positioned upward during operation of the lamp as a potential heat sink. Consequently, the asymmetric coating is fitted exactly opposite the exhaust tip. For practical reasons, as well, no coating is desired in the region of the exhaust tip, in order to avoid distortions and adhesive problems of the coating at the exhaust tip.
The lamp is preferably operated in a horizontal mounting position (referred to the longitudinal axis) and is distinguished by a coating which extends in the axial direction at least over 30% of the length of the discharge volume and which extends in the radial direction over at least a center angle of 30°
with the lowest 2 5 point of the discharge vessel as the middle of the center angle. The maximum length of the coating in the axial direction is limited by the overall length of the discharge vessel, and is limited in the radial direction by a center angle of at most 180°, since otherwise the effect of the shading would be too great. In this case, a circular shape or elliptical shape which is close to the circular shape is assumed in 3 0 the radial direction for the cross section of the discharge vessel. In the axial direction, the discharge vessel is elongated and preferably has the shape either of a body of a barrel, a cylinder or an ellipse.
The asymmetric coating preferably stretches to near the ends of the discharge 3 5 volume, where the electrodes are seated. In this case, the known heat-concentration spherical cap can be constructed additionally at both ends.
Attorney Docket No. 98P5548 Suitable above all as illuminating system is a wall luminaire which has an elongated reflector fitted laterally behind the horizontal lamp. This prevents the asymmetric coating from causing an appreciable shading of the radiation emitted by the luminaire.
The coating according to the invention renders it possible to raise the lighting data of a lamp without large changes to other parameters. It is even possible to use the same reflector paste as is already used for the end silvering. Again, there are no extra costs in the production, since no additional process step is required.
The extra consumption of the reflector paste can be neglected.
A particularly valuable and environmentally friendly point of view is that, because of the higher operating temperature, it is possible to reduce by approximately mg the absolute quantity of Hg required to fill a lamp. Apart from this, there is 15 no need for any change in the composition of the filling for the purpose of improving lighting data.
In order to ensure the required unambiguous orientation of the lamp in the correct operating position, it is possible to fall back on a known orientatable base/holder 2 0 system such as is described, for example, in US-A 5 731 656. It is possible thereby to ensure very easily the installation position which is required to maintain an optimum effect and for which the asymmetric coating points downward.
Figures The invention is to be explained below in more detail with the aid of a plurality of exemplary embodiments. In the drawing:
Figure 1 shows a metal halide lamp in a side view, Figure 2 shows a cross section through the metal halide lamp of Figure 1 Figure 3 shows a further exemplary embodiment of a metal halide lamp in plan view of a pinch, and Figure 4 shows a side view, rotated by 90°, of the lamp from Figure 3.
Attorney Docket No. 98P5548 Description of the drawings Figures 1 and 2 represent diagrammatically a 2000 W high-pressure discharge lamp 1 without an outer bulb with a length of approximately 190 mm, such as is described in more detail, for example, in US-A 5 142 195. It is intended for use in reflectors although being now arranged horizontally and transverse to the reflector axis instead of axially.
The discharge vessel 2 made from silica glass defines a longitudinal axis X
and is designed as a barrel-shaped body whose generatrix is a circular arc. The discharge volume is approximately 20 cm3. The bar-shaped tungsten electrodes 6 with a filament pushed on are aligned axially in pinches 5 at both ends of the discharge vessel. The electrodes 6 are fastened in the pinch 5 on foils 8 at which outer supply leads 9 start. A ceramic base 10 is fastened with the aid of cement on the end of the pinch 5 remote from the discharge. The discharge vessel 2 contains a filling made from an inert gas, mercury (180 mg now suffices instead of approximately 200 mg) as well as metal halides. The ends of the discharge vessel are provided with a heat-concentration spherical cap 13 made from zirconium oxide.
2 0 In addition, an asymmetric coating 4 is applied to the discharge vessel 2, specifically opposite the exhaust tip 3 in the region which is situated lowest in the installed state and contains the cold spot T. The asymmetric coating 4 likewise consists of zirconium oxide and is an elongated, oval spot which has an axial width a of approximately 50% of the width of the barrel-shaped body. Its maximum radial extent covers a center angle of approximately a = 55° (see Figure 2). Only the front half of the spot is to be seen in the side view of Figure l, in which the exhaust tip 3 is at the top.
A further exemplary embodiment is shown in Figures 3 and 4. This is a 1000 W
3 0 metal halide lamp 19 similar to that described in Figure 1. Figure 3 shows a plan view of a pinch 23. The lamp 19 is seen from below in Figure 4. The asymmetric coating 20 extends over the entire axial length of the volume of the discharge vessel 21 and is connected at the ends to the heat-concentration spherical caps 22.
The radial extent corresponds to a center angle of approximately 90°.
The lamp is 3 5 intended for installation in a luminaire whose elliptical reflector 25 is seated laterally next to the lamp 19. The main direction of emission forward is represented by an arrow 26.
Attorney Docket No. 98P5548 The color locus, the color rendition and the luminous flux, in particular, are significantly improved by the asymmetric coating by comparison with the prior art.
Moreover the operating voltage of the lamp is raised on average by 20 V to approximately 125 V. A comparison between an uncoated and a coated lamp is to be found in Table 1, where the luminous flux ~ (in klm), the color coordinates x and y and the color rendition index Ra are given for both lamps. There is a substantial improvement in the luminous flux (by 7%) and the color rendition index (by 15%). The color locus is plainly closer to white (x,y=0.333) or to the curve for the Planckian radiator.
Attorney Docket No. 98P5548 _7_ Table 1 Uncoated lamp Coated lamp ~ (klm) 80.7 86.8 x 0.297 0.332 y 0.377 0.368 Ra 75 86 A wipe-resistant reflector paste based on zirconium oxide was used as coating material. Its layer thickness and homogeneity correspond to the usual value for heat-concentration spherical caps. The lamp was coated in a region about the cold spot at which filling condensate forms during operation. This region is situated in a special case on the side opposite the exhaust tip.
Claims (12)
1. A high-pressure discharge lamp having an elongated discharge vessel (2) which defines an axial axis of symmetry and surrounds a discharge volume, two electrodes (6) being situated opposite on the axis, and which is essentially circularly cylindrical in the radial direction, wherein in a limited region which includes the cold spot, the discharge vessel (2) has a reflecting coating (4) in a radially asymmetric fashion.
2. The high-pressure discharge lamp as claimed in claim 1, wherein the coating is a metallic or nonmetallic layer or a layer roughened by sandblasting or etching.
3. The high-pressure discharge lamp as claimed in claim 1, wherein the coating has an axial length of at least 30% of the discharge volume.
4. The high-pressure discharge lamp as claimed in claim 1, wherein the coating extends in the axial direction over the entire discharge volume.
5. The high-pressure discharge lamp as claimed in claim 1, wherein in the radial direction the coating encloses a maximum center angle a of at least 30°.
6. The high-pressure discharge lamp as claimed in claim 1, wherein in the radial direction the coating encloses a maximum center angle .alpha. of at most 180°.
7. The high-pressure discharge lamp as claimed in claim 1, wherein the filling contains mercury and metal halides.
8. The high-pressure discharge lamp as claimed in claim 1, wherein it is operated in a horizontal mounting position, the cold spot (T) being situated at the lowest point.
9. The high-pressure discharge lamp as claimed in claim 1, wherein heat-concentration spherical caps (13) are fitted at the ends of the discharge vessel.
10. The high-pressure discharge lamp as claimed in claim 1, wherein the discharge vessel (2) is the sole bulb.
11. The high-pressure discharge lamp as claimed in claim 1, wherein the lamp has an orientatable base.
12. An illuminating system having a high-pressure discharge lamp as claimed in one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998143418 DE19843418A1 (en) | 1998-09-22 | 1998-09-22 | High-pressure discharge lamp and associated lighting system |
| DE19843418.9 | 1998-09-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2280556A1 true CA2280556A1 (en) | 2000-03-22 |
Family
ID=7881826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2280556 Abandoned CA2280556A1 (en) | 1998-09-22 | 1999-08-20 | High-pressure discharge lamp and associated illuminating system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0989587A1 (en) |
| JP (1) | JP3067635U (en) |
| KR (1) | KR200170646Y1 (en) |
| CA (1) | CA2280556A1 (en) |
| DE (1) | DE19843418A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7973482B2 (en) | 2004-04-16 | 2011-07-05 | OSRAM Gesellschaft mit beschraenkler Haftung | High-pressure discharge lamp with halogens |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10063376A1 (en) | 2000-12-19 | 2002-06-20 | Philips Corp Intellectual Pty | High pressure discharge lamp used as a light source in digital projection systems comprises a longitudinally extended bulb having two throat regions and a vacuum-tight discharge chamber |
| DE20307607U1 (en) * | 2003-05-15 | 2004-09-23 | Zumtobel Staff Gmbh | Lighting arrangement consisting of a gas discharge lamp and a shielding sleeve |
| EP1665330A1 (en) * | 2003-09-11 | 2006-06-07 | Philips Intellectual Property & Standards GmbH | High-pressure gas discharge lamp |
| EP1784852A2 (en) | 2004-08-26 | 2007-05-16 | Philips Intellectual Property & Standards GmbH | Lamp with reflective coating |
| JP2008538049A (en) * | 2005-04-12 | 2008-10-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Lamp with one filament for vehicle headlamp with low beam, fog light, turning light or bending light function |
| WO2008129487A2 (en) * | 2007-04-24 | 2008-10-30 | Koninklijke Philips Electronics N.V. | High pressure discharge lamp and vehicle headlight |
| EP2190005A3 (en) * | 2008-11-25 | 2012-07-11 | NGK Insulators, Ltd. | Light-emitting container for high-intensity discharge lamp and high-intensity discharge lamp |
| WO2013050914A1 (en) * | 2011-10-04 | 2013-04-11 | Koninklijke Philips Electronics N.V. | Metal halide lamp for automotive headlamp and headlamp with said lamp |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3851200A (en) * | 1972-12-11 | 1974-11-26 | Gen Electric | Heat and light reflective coating on quartz lamp |
| US3963951A (en) * | 1975-06-20 | 1976-06-15 | Gte Sylvania Incorporated | Metal halide discharge lamp having a reflective coating |
| DE2535921A1 (en) * | 1975-08-12 | 1977-03-03 | Patra Patent Treuhand | MERCURY VAPOR HIGH PRESSURE DISCHARGE LAMP WITH ADDED METAL HALOGENIDES FOR HORIZONTAL BURNING POSITION |
| NL178107C (en) * | 1977-12-23 | 1986-01-16 | Philips Nv | HIGH PRESSURE DISCHARGE LAMP. |
| DE3368810D1 (en) * | 1982-02-10 | 1987-02-05 | Mitsubishi Electric Corp | Metal vapor discharge lamp |
| GB2284704B (en) * | 1993-12-10 | 1998-07-08 | Gen Electric | Patterned optical interference coatings for electric lamps |
| US5952768A (en) * | 1994-10-31 | 1999-09-14 | General Electric Company | Transparent heat conserving coating for metal halide arc tubes |
| DE19517516A1 (en) * | 1995-05-12 | 1996-11-14 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Electric lamp with two bases and preferred operating position and socket as well as base and base sleeve for such a lamp |
-
1998
- 1998-09-22 DE DE1998143418 patent/DE19843418A1/en not_active Withdrawn
-
1999
- 1999-07-02 EP EP99112630A patent/EP0989587A1/en not_active Withdrawn
- 1999-08-20 CA CA 2280556 patent/CA2280556A1/en not_active Abandoned
- 1999-09-21 KR KR19990020380U patent/KR200170646Y1/en not_active IP Right Cessation
- 1999-09-22 JP JP1999007260U patent/JP3067635U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7973482B2 (en) | 2004-04-16 | 2011-07-05 | OSRAM Gesellschaft mit beschraenkler Haftung | High-pressure discharge lamp with halogens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3067635U (en) | 2000-04-07 |
| DE19843418A1 (en) | 2000-03-23 |
| EP0989587A1 (en) | 2000-03-29 |
| KR200170646Y1 (en) | 2000-02-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |