WO2003073465A1 - Light engine and vehicle with light engine - Google Patents

Light engine and vehicle with light engine Download PDF

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Publication number
WO2003073465A1
WO2003073465A1 PCT/IB2003/000325 IB0300325W WO03073465A1 WO 2003073465 A1 WO2003073465 A1 WO 2003073465A1 IB 0300325 W IB0300325 W IB 0300325W WO 03073465 A1 WO03073465 A1 WO 03073465A1
Authority
WO
WIPO (PCT)
Prior art keywords
light engine
cooling
discharge lamp
ignition means
vehicle
Prior art date
Application number
PCT/IB2003/000325
Other languages
French (fr)
Inventor
Pleun Dona
Petrus J. M. Fransen
Aloysius J. M. Peters
Ralph H. Peters
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.
Priority to AU2003201509A priority Critical patent/AU2003201509A1/en
Publication of WO2003073465A1 publication Critical patent/WO2003073465A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/46—Forced cooling using liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0011—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor with light guides for distributing the light between several lighting or signalling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/56—Cooling arrangements using liquid coolants
    • F21V29/57—Cooling arrangements using liquid coolants characterised by control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/56—Cooling arrangements using liquid coolants
    • F21V29/58—Cooling arrangements using liquid coolants characterised by the coolants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/56—Cooling arrangements using liquid coolants
    • F21V29/59—Cooling arrangements using liquid coolants with forced flow of the coolant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/30—Circuit boards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • F21S41/172—High-intensity discharge light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/251—Light guides the light guides being used to transmit light from remote light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/10—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type
    • F21V2200/17—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of the optical fibres type characterised by the admission of light into the guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02—Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • F21V23/026—Fastening of transformers or ballasts

Definitions

  • the invention relates to a light engine comprising a high-pressure discharge lamp and an ignition means for igniting the discharge lamp, the ignition means being located in the vicinity of the discharge lamp.
  • the invention also relates to a vehicle provided with a light engine.
  • light engines are known per se. They are used, inter alia, for general lighting purposes, for so-called sign and contour illumination, for signal illumination, such as in traffic lights or traffic-control systems, for example in road-marking systems for dynamically or statically controlling traffic flows. Such light engines are further used in projection illumination and in fiber-optical illumination.
  • State-of-the-art high-pressure discharge lamps offer a long life at a relatively high efficiency. Examples of high-pressure discharge lamps are high-pressure sodium lamps and metal halide lamps. Such discharge lamps have a very high ignition voltage and, consequently, the ignition means generate a high ignition pulse of, for example, at least 2.5 kN.
  • High-pressure discharge lamps generally comprise an electric lamp with a pair of electrodes in an ionizable gas filling.
  • a light engine of the kind mentioned in the opening paragraph is known in the art.
  • a drawback of the known light engine is that the service life of the light engine is insufficient.
  • a light engine of the kind mentioned in the opening paragraph is for this purpose characterized in that the light engine comprises cooling means for cooling the ignition means.
  • the high-pressure discharge lamp not only produces light but also a substantial amount of heat. Because the ignition means are located in the vicinity of the discharge lamp, the ignition means are heated by the heat from the discharge lamp when the discharge lamp is in operation. By cooling the ignition means the service life of the ignition means is prolonged.
  • the cooling means comprise a liquid.
  • Liquid cooling generally is more efficient than air cooling.
  • liquid cooling is more space efficient than (forced) air cooling.
  • liquid is transported through the cooling means.
  • the cooling means comprise water.
  • Water is a very efficient cooling means.
  • Special substances may be added to the water to enhance the efficiency of the cooling means.
  • An example of such a special substance comprises an anti-freezing means that is added to the water cooling.
  • the cooling means comprise oil.
  • Oil is a very efficient cooling means and is useful, in particular, for temperatures higher than the boiling temperature of water.
  • the cooling means are provided between the discharge lamp and the ignition means, the ignition means being in contact with the cooling means.
  • a wall comprising the cooling means is provided between the discharge lamp and the ignition means.
  • the ignition means are mounted on the cooling means, thereby providing good thermal contact.
  • the cooling means function as a heat shield between the high-pressure discharge lamp and the ignition means.
  • the high-pressure discharge lamp comprises a mercury-free high-pressure discharge lamp.
  • Mercury-free lamps are environmentally friendly. In governmental regulations regarding vehicle design and manufacturing, there is a tendency to require vehicles to be free of mercury. When the light engine according to the invention is employed in vehicles, the application of a mercury-free lamp helps to fulfill (future) environmental requirements.
  • Fig. 1 shows an exploded side view of an embodiment of the light engine according to the invention
  • Fig. 2 shows a side view of an embodiment of the cooling means of the light engine as shown in Figure 1 ;
  • Fig. 3 shows a flow chart of a light engine mounted in the interior of a vehicle
  • Fig. 4 shows the temperature of the ignition means as a function of time.
  • FIG. 1 shows an exploded side view of an embodiment of the light engine 10 according to the invention.
  • the light engine 10 comprises a compact housing 1, 2 made, for example, from a (lightweight) metal, e.g. aluminum or stainless steel.
  • the housing 1, 2 is provided with a high-pressure discharge lamp 3, in this example a compact high-pressure discharge lamp in quartz with a ionizable filling comprising Xe.
  • a mercury-free high-pressure discharge lamp is employed.
  • UN-shielding is not employed in the housing 1, 2.
  • the high-pressure discharge lamp 3 is mounted in a reflector 4 for directing the light towards an opening 11 in the housing 1.
  • the opening 11 is provided with a lens (not shown in Figure 1) which, preferably, is provided with an UN- shield, for example an UN-absorbing or UV-reflecting coating.
  • an ignition means 5 is provided comprising starting electronics for the high-pressure discharge lamp 3.
  • a cooling means 6 is provided for cooling the ignition means 5.
  • the two parts of the housing 1, 2 and the cooling means 6 together form the light engine 10.
  • FIG 2 shows a side view of an embodiment of the cooling means 6 of the light engine 10 as shown in Figure 1.
  • the high-pressure discharge lamp and the ignition means are not shown in Figure 2.
  • the cooling means 6 in Figure 2 is a box-shaped disc functioning as a heat shield between the discharge lamp 3 and the ignition means 5.
  • a hole 18 is provided in the cooling means 6 for connecting the high-pressure discharge lamp to the ignition means.
  • the hole in the example of Figure 2 has a rectangular shape and is dimensioned such that the ignition means 5 fits into the hole 18 of the cooling means 6 (see Figure 1).
  • connection means 11, 12 are provided for allowing cooling liquid to enter and to exit the cooling means 6.
  • a tube 13 is provided in the cooling means 6 for guiding the liquid through the cooling means 6.
  • spacers 21, 22 and holes 25 are provided in the cooling means 6.
  • FIG 3 shows a flowchart of the light engine 10 mounted in the interior of a vehicle.
  • the light engine 10 is mounted in the vehicle, for example in the motor compartment.
  • the light engine 10 comprises a housing 1 provided with a high-pressure discharge lamp (not shown in Figure 3).
  • the housing 1 has an opening 11 for emitting the light of the discharge lamp.
  • the opening 11 is connected to (bundles of) optical fibers 31 which transport the light originating from the discharge lamp towards the parts of the vehicles which emit light.
  • the optical fibers 31 are connected to the headlight 32 of the vehicle.
  • the number of fibers which are connected to the relevant parts of the vehicle e.g. indicator signs, brake lights, interior lighting of the vehicle, etc.
  • the amount of light emitted by said parts can be selected.
  • the various parts of the vehicle can be selected to emit the desired amount of light at the desired moment.
  • the light engine 10 is provided with ignition means
  • the light engine 10 is provided with cooling means 6, in this example a water-cooled heat shield.
  • cooling is provided by the cooling system of the vehicle, in this example the heat radiator 36 of the vehicle.
  • the cooling liquid stimulated by pumping means 37 is transported by tubes 38 from the heat radiator 36 to the cooling means 6.
  • the ballast electronics is located inside the housing of the light engine. In general, it is convenient to keep the distance between the ballast electronics and the ignition means as short as possible (shorter high tension cables between the ballast electronics and the ignition means).
  • Figure 4 shows the temperature T (in °C) of the ignition means 5 as a function of time t (min).
  • the ambient temperature was approximately 20°C.
  • Curve (a) in Figure 4 is the temperature curve of the ignition means 5 as a function of time.
  • Curve (b) in Figure 4 is the temperature curve of the part of the housing with reference numeral 1 (see Figure 1) as a function of time
  • curve (c) is the temperature curve of the part of the housing with reference numeral 2 (see Figure 1) as a function of time
  • curve (d) is the temperature curve of the cooling liquid as a function of time.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A light engine (10) has a high-pressure discharge lamp (3) and an ignition means (5) for igniting the discharge lamp (3). The ignition means (5) is located in the vicinity of the discharge lamp (3). According to the invention, the light engine (10) comprises cooling means (6) for cooling the ignition means (5). Preferably, the cooling means (6) comprises a liquid, preferably water or oil. Preferably, the cooling means (6) is arranged between the discharge lamp (3) and the ignition means (5), the ignition means (5) being in contact with the cooling means (6). By cooling the ignition means (5), the service life of the ignition means (5) is prolonged.

Description

LIGHT ENGINE AND VEHICLE WITH LIGHT ENGINE
The invention relates to a light engine comprising a high-pressure discharge lamp and an ignition means for igniting the discharge lamp, the ignition means being located in the vicinity of the discharge lamp.
The invention also relates to a vehicle provided with a light engine. Such light engines are known per se. They are used, inter alia, for general lighting purposes, for so-called sign and contour illumination, for signal illumination, such as in traffic lights or traffic-control systems, for example in road-marking systems for dynamically or statically controlling traffic flows. Such light engines are further used in projection illumination and in fiber-optical illumination. State-of-the-art high-pressure discharge lamps offer a long life at a relatively high efficiency. Examples of high-pressure discharge lamps are high-pressure sodium lamps and metal halide lamps. Such discharge lamps have a very high ignition voltage and, consequently, the ignition means generate a high ignition pulse of, for example, at least 2.5 kN. High-pressure discharge lamps generally comprise an electric lamp with a pair of electrodes in an ionizable gas filling.
A light engine of the kind mentioned in the opening paragraph is known in the art. A drawback of the known light engine is that the service life of the light engine is insufficient.
It is an object of the invention to wholly or partly eliminate the above disadvantage. According to the invention, a light engine of the kind mentioned in the opening paragraph is for this purpose characterized in that the light engine comprises cooling means for cooling the ignition means.
In operation, the high-pressure discharge lamp not only produces light but also a substantial amount of heat. Because the ignition means are located in the vicinity of the discharge lamp, the ignition means are heated by the heat from the discharge lamp when the discharge lamp is in operation. By cooling the ignition means the service life of the ignition means is prolonged.
In a preferred embodiment of the light engine according to the invention, the cooling means comprise a liquid. Liquid cooling generally is more efficient than air cooling. In addition, liquid cooling is more space efficient than (forced) air cooling. In general, liquid is transported through the cooling means. By employing liquid cooling means a very compact light engine can be made. A compact light engine gives the manufacturer of the light engine more freedom of design.
In a preferred embodiment of the light engine according to the invention the cooling means comprise water. Water is a very efficient cooling means. Special substances may be added to the water to enhance the efficiency of the cooling means. An example of such a special substance comprises an anti-freezing means that is added to the water cooling.
In an alternative, preferred embodiment of the light engine according to the invention the cooling means comprise oil. Oil is a very efficient cooling means and is useful, in particular, for temperatures higher than the boiling temperature of water.
In a preferred embodiment of the light engine according to the invention the cooling means are provided between the discharge lamp and the ignition means, the ignition means being in contact with the cooling means. To create a good heat insulation between the discharge lamp and the ignition means, a wall comprising the cooling means is provided between the discharge lamp and the ignition means. Preferably, the ignition means are mounted on the cooling means, thereby providing good thermal contact. The cooling means function as a heat shield between the high-pressure discharge lamp and the ignition means. In a preferred embodiment of the light engine according to the invention, the high-pressure discharge lamp comprises a mercury-free high-pressure discharge lamp. Mercury-free lamps are environmentally friendly. In governmental regulations regarding vehicle design and manufacturing, there is a tendency to require vehicles to be free of mercury. When the light engine according to the invention is employed in vehicles, the application of a mercury-free lamp helps to fulfill (future) environmental requirements.
The invention will now be explained in more detail with reference to a number of embodiments and a drawing, in which:
Fig. 1 shows an exploded side view of an embodiment of the light engine according to the invention; Fig. 2 shows a side view of an embodiment of the cooling means of the light engine as shown in Figure 1 ;
Fig. 3 shows a flow chart of a light engine mounted in the interior of a vehicle, and
Fig. 4 shows the temperature of the ignition means as a function of time.
The Figures are purely diagrammatic and not drawn true to scale. Some dimensions are particularly strongly exaggerated for reasons of clarity. Equivalent components have been given the same reference numerals in the Figures whenever possible.
Figure 1 shows an exploded side view of an embodiment of the light engine 10 according to the invention. The light engine 10 comprises a compact housing 1, 2 made, for example, from a (lightweight) metal, e.g. aluminum or stainless steel. The housing 1, 2 is provided with a high-pressure discharge lamp 3, in this example a compact high-pressure discharge lamp in quartz with a ionizable filling comprising Xe. In a preferred embodiment of the invention, a mercury-free high-pressure discharge lamp is employed. UN-shielding is not employed in the housing 1, 2. The high-pressure discharge lamp 3 is mounted in a reflector 4 for directing the light towards an opening 11 in the housing 1. The opening 11 is provided with a lens (not shown in Figure 1) which, preferably, is provided with an UN- shield, for example an UN-absorbing or UV-reflecting coating. In the vicinity of the high-pressure discharge lamp 3, an ignition means 5 is provided comprising starting electronics for the high-pressure discharge lamp 3. Between the two parts of the housing 1, 2 a cooling means 6 is provided for cooling the ignition means 5. The two parts of the housing 1, 2 and the cooling means 6 together form the light engine 10. By cooling the ignition means 5 the service life of the ignition means 5 is prolonged.
Figure 2 shows a side view of an embodiment of the cooling means 6 of the light engine 10 as shown in Figure 1. The high-pressure discharge lamp and the ignition means are not shown in Figure 2. The cooling means 6 in Figure 2 is a box-shaped disc functioning as a heat shield between the discharge lamp 3 and the ignition means 5. A hole 18 is provided in the cooling means 6 for connecting the high-pressure discharge lamp to the ignition means. The hole in the example of Figure 2 has a rectangular shape and is dimensioned such that the ignition means 5 fits into the hole 18 of the cooling means 6 (see Figure 1). In the example of Figure 2, connection means 11, 12 are provided for allowing cooling liquid to enter and to exit the cooling means 6. A tube 13 is provided in the cooling means 6 for guiding the liquid through the cooling means 6. For construction purposes, spacers 21, 22 and holes 25 are provided in the cooling means 6.
Figure 3 shows a flowchart of the light engine 10 mounted in the interior of a vehicle. The light engine 10 is mounted in the vehicle, for example in the motor compartment. The light engine 10 comprises a housing 1 provided with a high-pressure discharge lamp (not shown in Figure 3). The housing 1 has an opening 11 for emitting the light of the discharge lamp. The opening 11 is connected to (bundles of) optical fibers 31 which transport the light originating from the discharge lamp towards the parts of the vehicles which emit light. By way of example, in Figure 3, the optical fibers 31 are connected to the headlight 32 of the vehicle. By selecting the number of fibers which are connected to the relevant parts of the vehicle (e.g. indicator signs, brake lights, interior lighting of the vehicle, etc.), the amount of light emitted by said parts can be selected. By incorporating suitable switching means, the various parts of the vehicle can be selected to emit the desired amount of light at the desired moment. In the example of Figure 3, the light engine 10 is provided with ignition means
5 which are electrically connected to ballast electronics 34 which is electrically connected to a battery 35 in the vehicle, hi addition, the light engine 10 is provided with cooling means 6, in this example a water-cooled heat shield. In the example of Figure 3, cooling is provided by the cooling system of the vehicle, in this example the heat radiator 36 of the vehicle. The cooling liquid stimulated by pumping means 37 is transported by tubes 38 from the heat radiator 36 to the cooling means 6. A preferred embodiment of the light engine according to the invention is characterized in that the vehicle comprises a cooling system for cooling parts of the engine of the vehicle and in that the light engine employs the cooling system of the vehicle. In an alternative embodiment, the ballast electronics is located inside the housing of the light engine. In general, it is convenient to keep the distance between the ballast electronics and the ignition means as short as possible (shorter high tension cables between the ballast electronics and the ignition means).
Experiments were performed to test the cooling capacity of the cooling means 6. Figure 4 shows the temperature T (in °C) of the ignition means 5 as a function of time t (min). The high-pressure discharge lamp 3 and the cooling means are switched on at t=0 and switched off after 150 minutes (t=150). During the experiments, the ambient temperature was approximately 20°C. Curve (a) in Figure 4 is the temperature curve of the ignition means 5 as a function of time. Curve (b) in Figure 4 is the temperature curve of the part of the housing with reference numeral 1 (see Figure 1) as a function of time, curve (c) is the temperature curve of the part of the housing with reference numeral 2 (see Figure 1) as a function of time and curve (d) is the temperature curve of the cooling liquid as a function of time. Without cooling, the temperature of the ignition means 5 after 100 minutes has increased to above 150°C (see curve (e) in Figure 4), whereas the temperature of the housing 1, 2 reached approximately 120°C. By cooling the ignition means 5 the service life of the ignition means 5 is prolonged.
It will be obvious that many modifications are possible to those skilled in the art within the scope of the invention.
The scope of protection of the invention is not limited to the embodiments given. The invention resides in each novel characteristic and each combination of characteristics. Reference numerals in the claims do not limit the scope of protection thereof. The use of the verb "comprise" and its conjugations does not exclude the presence of elements other than those specified in the claims. The use of the indefinite article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

Claims

CLAIMS:
1. A light engine (10) comprising a high-pressure discharge lamp (3) and an ignition means (5) for igniting the discharge lamp (3), the ignition means (5) being located in the vicinity of the discharge lamp (3), characterized in that the light engine (10) comprises cooling means (6) for cooling the ignition means (5).
2. A light engine according to claim 1, characterized in that the cooling means (6) comprise a liquid.
3. A light engine according to claim 1 or 2, characterized in that the cooling means (6) comprise water.
4. A light engine according to claim 1 or 2, characterized in that the cooling means (6) comprise oil.
5. A light engine according to claim 1 or 2, characterized in that the cooling means (6) are provided between the discharge lamp (3) and the ignition means (5), the ignition means (5) being in contact with the cooling means (6).
6. A light engine according to claim 1 or 2, characterized in that the high-pressure discharge lamp (3) comprises a mercury-free high-pressure discharge lamp.
7. A vehicle provided with a light engine according to claim 1 or 2.
8. A vehicle according to claim 6, characterized in that the vehicle comprises a cooling system for cooling parts of the engine of the vehicle and in that the light engine employs the cooling system of the vehicle.
PCT/IB2003/000325 2002-02-28 2003-01-30 Light engine and vehicle with light engine WO2003073465A1 (en)

Priority Applications (1)

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AU2003201509A AU2003201509A1 (en) 2002-02-28 2003-01-30 Light engine and vehicle with light engine

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Application Number Priority Date Filing Date Title
EP02075803 2002-02-28
EP02075803.3 2002-02-28

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TW (1) TW200305700A (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066532A1 (en) * 2004-12-22 2006-06-29 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh Lighting device comprising at least one light-emitting diode and vehicle headlight
CN109519863A (en) * 2018-11-14 2019-03-26 鲍灵杰 A kind of automobile LED high beam
CN110925094A (en) * 2019-11-28 2020-03-27 四川泛华航空仪表电器有限公司 Cooling structure of ignition device

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Publication number Priority date Publication date Assignee Title
DE1123202B (en) * 1958-06-28 1962-02-01 Frieseke & Hoepfner Gmbh Lighting device with a high pressure gas discharge lamp for cinema projection purposes
EP0975007A1 (en) * 1998-07-13 2000-01-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lighting system with a high pressure discharge lamp
US6313587B1 (en) * 1998-01-13 2001-11-06 Fusion Lighting, Inc. High frequency inductive lamp and power oscillator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123202B (en) * 1958-06-28 1962-02-01 Frieseke & Hoepfner Gmbh Lighting device with a high pressure gas discharge lamp for cinema projection purposes
US6313587B1 (en) * 1998-01-13 2001-11-06 Fusion Lighting, Inc. High frequency inductive lamp and power oscillator
EP0975007A1 (en) * 1998-07-13 2000-01-26 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lighting system with a high pressure discharge lamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066532A1 (en) * 2004-12-22 2006-06-29 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh Lighting device comprising at least one light-emitting diode and vehicle headlight
CN109519863A (en) * 2018-11-14 2019-03-26 鲍灵杰 A kind of automobile LED high beam
CN110925094A (en) * 2019-11-28 2020-03-27 四川泛华航空仪表电器有限公司 Cooling structure of ignition device
CN110925094B (en) * 2019-11-28 2021-10-22 四川泛华航空仪表电器有限公司 Cooling structure of ignition device

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