WO2006095294A1 - Lamp assembly comprising a reflector with more than one burner - Google Patents

Lamp assembly comprising a reflector with more than one burner Download PDF

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Publication number
WO2006095294A1
WO2006095294A1 PCT/IB2006/050670 IB2006050670W WO2006095294A1 WO 2006095294 A1 WO2006095294 A1 WO 2006095294A1 IB 2006050670 W IB2006050670 W IB 2006050670W WO 2006095294 A1 WO2006095294 A1 WO 2006095294A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
reflector
light
lamp assembly
reflecting surface
Prior art date
Application number
PCT/IB2006/050670
Other languages
French (fr)
Inventor
Frits Goverde
Constant Daems
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006095294A1 publication Critical patent/WO2006095294A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2026—Gas discharge type light sources, e.g. arcs

Definitions

  • Lamp assembly comprising a reflector with more than one burner
  • the invention relates to a lamp assembly for producing a beam of light, the lamp assembly comprising a reflector having a substantially concave reflecting surface, and at least two burners fixed in the reflector, wherein a part of the reflecting surface has a different focal point than another part of the reflecting surface, and wherein a burner is located at each focal point.
  • the focal point of a reflecting surface is the location from which light radiation can be emitted, which light radiation is reflected by this reflecting surface in order to form a desired beam of light.
  • Such a lamp assembly is described in US-B-6471358.
  • more than one burner is mounted in one reflector.
  • a main portion of the light radiation of each burner is reflected by a part of the reflecting surface of the reflector, and the shape of this part of the reflecting surface corresponds to a part of a paraboloid or ellipsoid having its focal point at the location of said burner.
  • the total quantity of light in the light beam is higher than the quantity of light radiation from one burner.
  • the reflecting surface of the reflector has a parabolic or elliptical shape
  • the burner for example, a high-pressure discharge lamp
  • the burner is located at the focal point and is surrounded by the reflector.
  • most of the light radiation of the burner is received by the reflecting surface of the reflector and is reflected, so that almost all of the light radiation of the burner leaves the lamp assembly in a parallel or in a diverging beam of light.
  • US-B-6471358 proposes the use of more than one burner in one reflector, wherein the quantity of light in the produced light beam can be higher than the radiation of one burner.
  • the increase of the quantity of light in the produced light beam is relatively small.
  • each burner is provided with reflector means for directing light radiation from said burner substantially towards the part of the reflecting surface having its focal point at the location of said burner.
  • a major part of the light radiation or almost all light radiation from the burner can be emitted from the burner towards the part of the reflecting surface having its focal point at the location of this burner.
  • a portion of the light radiation of the burner is emitted directly to said part of the reflecting surface, and another portion of the light radiation of the burner is emitted through the reflector means of this burner towards said part of the reflecting surface of the reflector.
  • Another advantage of making use of a light source having a lower capacity is its longer lifetime as compared with a light source having a higher capacity.
  • a lamp assembly having one 200W light source has a much shorter lifetime than a lamp assembly having two light sources of IOOW each.
  • the main direction in which said reflector means reflects said light radiation is preferably substantially perpendicular to the central axis of the beam of light produced by the lamp assembly, i.e. in the transverse direction with respect to the longitudinal axis of the burner.
  • the reflector means reflect the light radiation towards the part of the reflecting surface of the reflector at one side of the burner, which part reflects this radiation in the direction of the beam of light leaving the lamp assembly.
  • the expression "main direction” is understood to be the average direction by which the reflector means may reflect the light radiation in directions having a large angle to said main direction.
  • the reflector means may comprise a reflector inside the transparent glass bulb of the burner, or a reflector outside this bulb.
  • the reflector means comprise a light-reflecting coating on a portion of the bulb of each burner.
  • a coating on the outer side of the glass of the bulb is known in the art, and is called a back mirror. It is mostly applied at the front side of a burner, so that light radiation does not directly leave the burner at this front side and radiation of the burner is reflected by the back mirror to a reflector behind the burner.
  • each part of the reflecting surface of the reflector has a shape of substantially half an ellipsoid or a paraboloid, i.e. half an elliptical or parabolic dome, wherein the reflector is substantially symmetrical about a plane comprising the central axis of the produced beam of light, and wherein one of said parts of the reflecting surface is situated at each side of said plane, and each part has a focal point at the same side of said plane.
  • About half the bulb of the burner is preferably provided with a light-reflecting coating, so that each half of the reflecting surface of the reflector can receive almost all light radiation from one of the two burners. The quantity of light in the produced light beam is then almost double the quantity of light emitted by one burner.
  • the burners are preferably high-pressure gas discharge burners or halogen lamps.
  • the light-emitting source in such a lamp has relatively small dimensions and a relatively high light radiation output, so that a large quantity of light radiation can be emitted near the focal point.
  • substantially half the outer side of the light- emitting part of the burner is coated with a light-reflecting coating substantially at one side of a plane including the longitudinal axis of the burner.
  • the invention also relates to a burner for a lamp assembly as described above, wherein a portion of the bulb of the burner is coated with a light-reflecting coating.
  • Said light-reflecting coating is preferably substantially present at one side of a plane comprising the longitudinal axis of the burner, so that the main direction in which the reflecting coating reflects the light radiation is substantially perpendicular to the central axis of the beam of light leaving the lamp assembly.
  • the invention relates to a projector unit, in particular a beamer or front projector or a projection television, including a lamp assembly for producing a beam of light, which lamp assembly comprises a reflector having a substantially concave reflecting surface, and at least two burners fixed in the reflector, wherein a part of the reflecting surface has a different focal point than another part of the reflecting surface, and wherein a burner is located at each focal point, each burner being provided with reflector means for directing light radiation from said burner substantially towards the part of the reflecting surface having its focal point at the location of said burner.
  • Fig. 1 is a sectional view of a lamp assembly with two burners
  • Fig. 2 is a perspective view of a reflector of a lamp assembly with two burners
  • Fig. 3 is a perspective view of a reflector of a lamp assembly with three burners.
  • Figure 1 is a sectional view of a lamp assembly comprising a reflector 1 and two high-pressure gas discharge burners 2,3.
  • the plane of the drawing is the plane of symmetry of the lamp assembly, wherein both burners 2,3 are positioned in said plane.
  • the upper burner 2 is represented in a side view and the lower burner 3 is represented in a sectional view.
  • Each burner 2,3 comprises a bulb 4 of quartz glass enclosing a gas discharge space 5 in which two electrodes 6,7 are present. Each electrode 6,7 is electrically connected with current supply wires 10,11 through a molybdenum foil 8,9. Each molybdenum foil 8,9 is located in a sealed portion 12,13 of the bulb 4 of the lamp 2,3, in which the two sealed portions 12,13 extend outwardly in opposite directions. These are well known high-pressure gas discharge lamps.
  • Two electric wires 14,15 supply electric current from a power source (not shown) to the two burners 2,3 of the lamp assembly, and are therefore connected with the supply wires 10 and the supply wires 11, respectively. Electric wire 15 passes through the wall of the reflector 1 via an opening 23 in said wall.
  • Each burner 2,3 is fixed in the reflector 1 through one of its sealed portions 12 embedded in cement 16 which is present in two substantially cylindrical openings in the wall of the rear side of the reflector 1.
  • the inner surface 17 of the reflector 1 has the shape of two intersecting paraboloids, with the line of intersection 18 being located in a plane perpendicular to the plane of the drawing.
  • the axis of each paraboloid coincides with the longitudinal axis of one of the burners 2,3, while the gas discharge space 5 of each burner 2,3 is located at the focal point of one of the paraboloids.
  • the inner surface 17 of the reflector 1 is provided with a light-reflecting coating, so that the light radiation from the gas discharge spaces 5 is reflected in order to form a beam of light going into the right direction (in Figure 1).
  • the front side of the reflector 1 (the right side in the Figure) may be provided with a transparent glass plate in order to cover the inner side of the lamp assembly, through which glass plate the beam of light is transmitted.
  • a portion of each bulb 4 of the two burners 2,3 is provided with a light- reflecting coating 19,20 covering about half the surroundings of the gas discharge space 5.
  • Reflecting coating 19 of the upper burner 2 is represented in a side view
  • reflecting coating 20 of the lower burner 3 is represented in a sectional view, indicated as a fat, solid line.
  • Reflecting coating 19 of the upper burner 2 reflects light radiation from the gas discharge space 5 in the upward direction, so that it is directed towards the upper half 21 of the inner surface 17 of the reflector 1, and reflecting coating 20 of the lower burner 3 directs light radiation from the gas discharge space 5 of burner 3 downwards to the lower half 22 of said inner surface 17. Therefore, substantially all light radiation from the gas discharge space 5 of each burner 2,3 is emitted to its own part 21,22 of the light-reflecting inner surface 17 of the reflector 1, so that almost all light radiation of the two burners 2,3 is reflected by the light-reflecting inner surface 17 into a beam of light that leaves the lamp assembly.
  • FIG. 2 is a perspective view of the reflector of a lamp assembly comprising two burners which can be mounted in the two substantially cylindrical openings 25,26 in the wall of the reflector.
  • the light-reflecting inner surface of the reflector comprises two parts 27,28, each part having the shape of a part of an elliptical or parabolic dome.
  • the two parts 27,28 have a line of intersection 29, and each part 27,28 comprises one of said openings 25,26.
  • a burner having a back mirror as described above can be mounted in each opening 25,26, so that the light radiation from each burner is directed to its own part 27,28 of the light-reflecting inner surface of the reflector.
  • Figure 3 is a perspective view of the reflector of a lamp assembly comprising three burners which can be mounted in the three substantially cylindrical openings 31,32,33 in the wall of the reflector.
  • the light-reflecting inner surface of the reflector comprises three parts 34,35,36, each part having the shape of a part of an elliptical or parabolic dome.
  • the three parts 34,35,36 have three lines of intersection 37,38,39, and each part 34,35,36 comprises one of said openings 31,32,33.
  • a burner having a back mirror as described above can be mounted in each opening 31,32,33, so that the light radiation from each burner is directed to its own part 34,35,36 of the light-reflecting inner surface of the reflector.
  • the three focal points may have a position at which the light source in each focal point emits (directly and through its back mirror) light radiation to its part 34,35,36 of the reflecting inner surface of the reflector, said part 34,35,36 surrounding substantially half the light source, so that substantially all light radiation of the light source can be directed to the part 34,35,35 by making use of a back mirror that covers substantially half the surroundings of the light source.

Abstract

A lamp assembly for producing a beam of light, the lamp assembly comprising a reflector (1) having a substantially concave reflecting surface (17), and at least two burners (2,3) fixed in the reflector (1). A part (21,22) of the reflecting surface (17) has a different focal point than another part (22,21) of the reflecting surface (17), and a burner (2,3) is located at each focal point. Each burner (2,3) is provided with reflector means (19,20) for directing light radiation from said burner (2,3) substantially towards the part (21,22) of the reflecting surface (17) having its focal point at the location of said burner (2,3).

Description

Lamp assembly comprising a reflector with more than one burner
The invention relates to a lamp assembly for producing a beam of light, the lamp assembly comprising a reflector having a substantially concave reflecting surface, and at least two burners fixed in the reflector, wherein a part of the reflecting surface has a different focal point than another part of the reflecting surface, and wherein a burner is located at each focal point. The focal point of a reflecting surface is the location from which light radiation can be emitted, which light radiation is reflected by this reflecting surface in order to form a desired beam of light.
Such a lamp assembly is described in US-B-6471358. In order to increase the quantity of light output, while substantially maintaining the size of a conventional lighting device, more than one burner is mounted in one reflector. A main portion of the light radiation of each burner is reflected by a part of the reflecting surface of the reflector, and the shape of this part of the reflecting surface corresponds to a part of a paraboloid or ellipsoid having its focal point at the location of said burner. Although a portion of the light radiation of each burner is not reflected into the beam of light that leaves the lamp assembly, the total quantity of light in the light beam is higher than the quantity of light radiation from one burner.
In a conventional lamp assembly, the reflecting surface of the reflector has a parabolic or elliptical shape, and the burner, for example, a high-pressure discharge lamp, is located at the focal point and is surrounded by the reflector. In this assembly, most of the light radiation of the burner is received by the reflecting surface of the reflector and is reflected, so that almost all of the light radiation of the burner leaves the lamp assembly in a parallel or in a diverging beam of light.
In particular for applications in a projector, a relatively high light output is required, while the lamp assembly has relatively small dimensions. The light output should preferably be higher than the light radiation of a normal burner such as, for example, a conventional high-pressure discharge lamp. For this reason, US-B-6471358 proposes the use of more than one burner in one reflector, wherein the quantity of light in the produced light beam can be higher than the radiation of one burner. However, since only a part of the light radiation of each burner is reflected by the reflector of the lamp assembly, the increase of the quantity of light in the produced light beam is relatively small. It is an object of the invention to provide a lamp assembly for producing a beam of light, the lamp assembly comprising at least two burners fixed in the reflector of the lamp assembly, wherein parts of the reflecting surface of the reflector have different focal points, and wherein a burner is located at each focal point, while the quantity of light in the produced beam of light is further increased.
To achieve this object, each burner is provided with reflector means for directing light radiation from said burner substantially towards the part of the reflecting surface having its focal point at the location of said burner. In this case, a major part of the light radiation or almost all light radiation from the burner can be emitted from the burner towards the part of the reflecting surface having its focal point at the location of this burner. A portion of the light radiation of the burner is emitted directly to said part of the reflecting surface, and another portion of the light radiation of the burner is emitted through the reflector means of this burner towards said part of the reflecting surface of the reflector.
Another advantage of making use of a light source having a lower capacity is its longer lifetime as compared with a light source having a higher capacity. In general, a lamp assembly having one 200W light source has a much shorter lifetime than a lamp assembly having two light sources of IOOW each.
The main direction in which said reflector means reflects said light radiation is preferably substantially perpendicular to the central axis of the beam of light produced by the lamp assembly, i.e. in the transverse direction with respect to the longitudinal axis of the burner. The reflector means reflect the light radiation towards the part of the reflecting surface of the reflector at one side of the burner, which part reflects this radiation in the direction of the beam of light leaving the lamp assembly. The expression "main direction" is understood to be the average direction by which the reflector means may reflect the light radiation in directions having a large angle to said main direction.
The reflector means may comprise a reflector inside the transparent glass bulb of the burner, or a reflector outside this bulb. However, in a preferred embodiment, the reflector means comprise a light-reflecting coating on a portion of the bulb of each burner. Such a coating on the outer side of the glass of the bulb is known in the art, and is called a back mirror. It is mostly applied at the front side of a burner, so that light radiation does not directly leave the burner at this front side and radiation of the burner is reflected by the back mirror to a reflector behind the burner.
In a further preferred embodiment, two burners are present in one reflector, in which each part of the reflecting surface of the reflector has a shape of substantially half an ellipsoid or a paraboloid, i.e. half an elliptical or parabolic dome, wherein the reflector is substantially symmetrical about a plane comprising the central axis of the produced beam of light, and wherein one of said parts of the reflecting surface is situated at each side of said plane, and each part has a focal point at the same side of said plane. About half the bulb of the burner is preferably provided with a light-reflecting coating, so that each half of the reflecting surface of the reflector can receive almost all light radiation from one of the two burners. The quantity of light in the produced light beam is then almost double the quantity of light emitted by one burner.
The burners are preferably high-pressure gas discharge burners or halogen lamps. The light-emitting source in such a lamp has relatively small dimensions and a relatively high light radiation output, so that a large quantity of light radiation can be emitted near the focal point. In a preferred embodiment, substantially half the outer side of the light- emitting part of the burner is coated with a light-reflecting coating substantially at one side of a plane including the longitudinal axis of the burner. The invention also relates to a burner for a lamp assembly as described above, wherein a portion of the bulb of the burner is coated with a light-reflecting coating. Said light-reflecting coating is preferably substantially present at one side of a plane comprising the longitudinal axis of the burner, so that the main direction in which the reflecting coating reflects the light radiation is substantially perpendicular to the central axis of the beam of light leaving the lamp assembly.
Furthermore, the invention relates to a projector unit, in particular a beamer or front projector or a projection television, including a lamp assembly for producing a beam of light, which lamp assembly comprises a reflector having a substantially concave reflecting surface, and at least two burners fixed in the reflector, wherein a part of the reflecting surface has a different focal point than another part of the reflecting surface, and wherein a burner is located at each focal point, each burner being provided with reflector means for directing light radiation from said burner substantially towards the part of the reflecting surface having its focal point at the location of said burner.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings, Fig. 1 is a sectional view of a lamp assembly with two burners, Fig. 2 is a perspective view of a reflector of a lamp assembly with two burners, and
Fig. 3 is a perspective view of a reflector of a lamp assembly with three burners.
Figure 1 is a sectional view of a lamp assembly comprising a reflector 1 and two high-pressure gas discharge burners 2,3. The plane of the drawing is the plane of symmetry of the lamp assembly, wherein both burners 2,3 are positioned in said plane. The upper burner 2 is represented in a side view and the lower burner 3 is represented in a sectional view.
Each burner 2,3 comprises a bulb 4 of quartz glass enclosing a gas discharge space 5 in which two electrodes 6,7 are present. Each electrode 6,7 is electrically connected with current supply wires 10,11 through a molybdenum foil 8,9. Each molybdenum foil 8,9 is located in a sealed portion 12,13 of the bulb 4 of the lamp 2,3, in which the two sealed portions 12,13 extend outwardly in opposite directions. These are well known high-pressure gas discharge lamps. Two electric wires 14,15 supply electric current from a power source (not shown) to the two burners 2,3 of the lamp assembly, and are therefore connected with the supply wires 10 and the supply wires 11, respectively. Electric wire 15 passes through the wall of the reflector 1 via an opening 23 in said wall. Each burner 2,3 is fixed in the reflector 1 through one of its sealed portions 12 embedded in cement 16 which is present in two substantially cylindrical openings in the wall of the rear side of the reflector 1.
The inner surface 17 of the reflector 1 has the shape of two intersecting paraboloids, with the line of intersection 18 being located in a plane perpendicular to the plane of the drawing. The axis of each paraboloid coincides with the longitudinal axis of one of the burners 2,3, while the gas discharge space 5 of each burner 2,3 is located at the focal point of one of the paraboloids. The inner surface 17 of the reflector 1 is provided with a light-reflecting coating, so that the light radiation from the gas discharge spaces 5 is reflected in order to form a beam of light going into the right direction (in Figure 1). The front side of the reflector 1 (the right side in the Figure) may be provided with a transparent glass plate in order to cover the inner side of the lamp assembly, through which glass plate the beam of light is transmitted. A portion of each bulb 4 of the two burners 2,3 is provided with a light- reflecting coating 19,20 covering about half the surroundings of the gas discharge space 5. Reflecting coating 19 of the upper burner 2 is represented in a side view, and reflecting coating 20 of the lower burner 3 is represented in a sectional view, indicated as a fat, solid line. Reflecting coating 19 of the upper burner 2 reflects light radiation from the gas discharge space 5 in the upward direction, so that it is directed towards the upper half 21 of the inner surface 17 of the reflector 1, and reflecting coating 20 of the lower burner 3 directs light radiation from the gas discharge space 5 of burner 3 downwards to the lower half 22 of said inner surface 17. Therefore, substantially all light radiation from the gas discharge space 5 of each burner 2,3 is emitted to its own part 21,22 of the light-reflecting inner surface 17 of the reflector 1, so that almost all light radiation of the two burners 2,3 is reflected by the light-reflecting inner surface 17 into a beam of light that leaves the lamp assembly. Such a light beam may be a parallel or a diverging beam, depending on the shape of said inner surface 17 of the reflector 1 and the locations of the gas discharge spaces 5 in the reflector 1. Figure 2 is a perspective view of the reflector of a lamp assembly comprising two burners which can be mounted in the two substantially cylindrical openings 25,26 in the wall of the reflector. The light-reflecting inner surface of the reflector comprises two parts 27,28, each part having the shape of a part of an elliptical or parabolic dome. The two parts 27,28 have a line of intersection 29, and each part 27,28 comprises one of said openings 25,26. A burner having a back mirror as described above can be mounted in each opening 25,26, so that the light radiation from each burner is directed to its own part 27,28 of the light-reflecting inner surface of the reflector.
Figure 3 is a perspective view of the reflector of a lamp assembly comprising three burners which can be mounted in the three substantially cylindrical openings 31,32,33 in the wall of the reflector. The light-reflecting inner surface of the reflector comprises three parts 34,35,36, each part having the shape of a part of an elliptical or parabolic dome. The three parts 34,35,36 have three lines of intersection 37,38,39, and each part 34,35,36 comprises one of said openings 31,32,33. A burner having a back mirror as described above can be mounted in each opening 31,32,33, so that the light radiation from each burner is directed to its own part 34,35,36 of the light-reflecting inner surface of the reflector.
In a lamp assembly with the reflector of Figure 3, the three focal points may have a position at which the light source in each focal point emits (directly and through its back mirror) light radiation to its part 34,35,36 of the reflecting inner surface of the reflector, said part 34,35,36 surrounding substantially half the light source, so that substantially all light radiation of the light source can be directed to the part 34,35,35 by making use of a back mirror that covers substantially half the surroundings of the light source.
The embodiment of the lamp assembly as described above and the two reflectors are only examples; a great many other embodiments and variations are possible.

Claims

CLAIMS:
1. A lamp assembly for producing a beam of light, the lamp assembly comprising a reflector (1) having a substantially concave reflecting surface (17), and at least two burners (2,3) fixed in the reflector (1), wherein a part (21,22) of the reflecting surface (17) has a different focal point than another part (22,21) of the reflecting surface (17), and wherein a burner (2,3) is located at each focal point, characterized in that each burner (2,3) is provided with reflector means (19,20) for directing light radiation from said burner (2,3) substantially towards the part (21,22) of the reflecting surface (17) having its focal point at the location of said burner (2,3).
2. A lamp assembly as claimed in claim 1, characterized in that the main direction in which said reflector means (19,20) reflects said light radiation is substantially perpendicular to the central axis of said beam of light.
3. A lamp assembly as claimed in any one of the preceding claims, characterized in that a portion of the bulb (4) of each burner (2,3) is coated with a light-reflecting coating
(19,20).
4. A lamp assembly as claimed in any one of the preceding claims, characterized in that two burners (2,3) are present in one reflector, in which each part (21,22) of the reflecting surface (17) of the reflector has a shape of substantially half an elliptical or parabolic dome, wherein the reflector (1) is substantially symmetrical about a plane comprising the central axis of said beam of light, and wherein one of said parts (21,22) of the reflecting surface (17) is situated at each side of said plane, and each part (21,22) has a focal point at the same side of said plane.
5. A lamp assembly as claimed in any one of the preceding claims, characterized in that the burners (2,3) are high-pressure gas discharge burners or halogen lamps.
6. A lamp assembly as claimed in claim 5, characterized in that substantially half the outer side of the light-emitting part of the burner (2,3) is coated with a light-reflecting coating 19,20) substantially at one side of a plane including the longitudinal axis of the burner (2,3).
7. A burner for a lamp assembly as claimed in any one of the preceding claims, characterized in that a portion of the bulb (4) of the burner (2,3) is coated with a light- reflecting coating (19,20).
8. A burner as claimed in claim 7, characterized in that said light-reflecting coating (19,20) is substantially present at one side of a plane comprising the longitudinal axis of the burner (2,3).
9. A projector unit including a lamp assembly for producing a beam of light, the lamp assembly comprising a reflector (1) having a substantially concave reflecting surface (17), and at least two burners (2,3) fixed in the reflector (1), wherein a part (21,22) of the reflecting surface (17) has a different focal point than another part (22,21) of the reflecting surface (17), and wherein a burner (2,3) is located at each focal point, characterized in that each burner (2,3) is provided with reflector means (19,20) for directing light radiation from said burner (2,3) substantially towards the part (21,22) of the reflecting surface (17) having its focal point at the location of said burner (2,3).
PCT/IB2006/050670 2005-03-09 2006-03-03 Lamp assembly comprising a reflector with more than one burner WO2006095294A1 (en)

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EP05101806 2005-03-09
EP05101806.7 2005-03-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460022C (en) * 1928-05-18 Julius Patten Dr Headlights
EP0660032A1 (en) * 1993-12-10 1995-06-28 General Electric Company Lighting system for increasing brightness to a light guide
US6471358B1 (en) 1996-08-26 2002-10-29 Seiko Epson Corporation Lighting device and projector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE460022C (en) * 1928-05-18 Julius Patten Dr Headlights
EP0660032A1 (en) * 1993-12-10 1995-06-28 General Electric Company Lighting system for increasing brightness to a light guide
US6471358B1 (en) 1996-08-26 2002-10-29 Seiko Epson Corporation Lighting device and projector

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