EP1467144B1 - Light generating device with reflector - Google Patents

Light generating device with reflector Download PDF

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Publication number
EP1467144B1
EP1467144B1 EP04005058.5A EP04005058A EP1467144B1 EP 1467144 B1 EP1467144 B1 EP 1467144B1 EP 04005058 A EP04005058 A EP 04005058A EP 1467144 B1 EP1467144 B1 EP 1467144B1
Authority
EP
European Patent Office
Prior art keywords
reflector
generating device
light generating
light
heat dissipation
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.)
Expired - Lifetime
Application number
EP04005058.5A
Other languages
German (de)
French (fr)
Other versions
EP1467144A3 (en
EP1467144A2 (en
Inventor
Lars Dr. Bewig
Ulrich Zierfas
Torsten Holdmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Auer Lighting GmbH
Original Assignee
Auer Lighting GmbH
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Publication date
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Publication of EP1467144A2 publication Critical patent/EP1467144A2/en
Publication of EP1467144A3 publication Critical patent/EP1467144A3/en
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Publication of EP1467144B1 publication Critical patent/EP1467144B1/en
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Classifications

    • 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
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • 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
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/03—Gas-tight or water-tight arrangements with provision for venting
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings

Definitions

  • the invention relates generally to lighting means, in particular the invention relates to a light-generating device with reflector and cooling structure.
  • EP 0 311 124 A1 is a therapeutic lamp for biostimulation with polarized light known, in which the reflector concentrically arranged rear cooling rings are incorporated.
  • the DE 24 37 926 A1 discloses a lighting fixture having a cold mirror reflector disposed in a housing. Ventilation openings are provided in the housing so that air can circulate between the inside and outside of the housing.
  • the reflector is made of metallic material.
  • a pigmented glassy coating absorbs the infrared light passing through the cold mirror coating.
  • the invention has for its object to provide a light-generating system, in particular a light-generating device, which provides an improvement in the above-mentioned problems.
  • This object is already achieved in a surprisingly simple manner by the subject matter of the independent claims.
  • Advantageous embodiments and further developments are further specified in the subclaims.
  • the invention provides a light-generating device comprising a reflector, and means for improving the heat dissipation from the reflector.
  • a light-generating device wherein the means for improving the heat dissipation with the Rear side of the reflector is connected or arranged on this.
  • the back or outer side of the reflector is understood to mean a side of the reflector facing away from the luminous means or the location provided for the luminous means.
  • the device for improving the heat removal comprises a radiation-absorbing surface.
  • the device for improving the heat dissipation may comprise a radiation-absorbing coating, wherein it is particularly expedient if the coating absorbs the heat radiation in the infrared range, in particular in the spectral range.
  • a radiation-absorbing coating can in a simple way to not or low-absorbing materials of a reflector body, such as a glass dome are applied.
  • the heat radiation emitted by the reflector or passing through the reflector can be selectively absorbed there, so that improved cooling can be achieved at the radiation-absorbing surface.
  • a preferred embodiment also provides that the heat radiation-absorbing coating is disposed on the reflector outside.
  • the coating can cover the entire outside or one or more subregions.
  • a surface intended for cooling comprises vortex-generating structures.
  • the structures may be arranged on at least one area of the surface of the reflector.
  • a preferred embodiment of the invention provides that the vortex-generating structures are arranged on the reflector outside.
  • Vortex-generating structures are the dimples or depressions provided according to the invention, which may be, for example, circular. These can be easily produced and ensure in case of flow around a surface provided with such structures with a cooling fluid due to the vortex formation for an effective mixing of cold and hot fluid layers and thus to a more effective heat exchange.
  • the reflector may also be advantageously equipped with a self-cleaning surface. This prevents the accumulation or deposition of impurities that Inter alia, adversely affect the heat dissipation.
  • Self-cleaning properties can be achieved, inter alia, by the vortex-forming structures mentioned above, whereby the formation of turbulence prevents formation of flow dead zones and thus the deposition of impurities, such as dust.
  • the device for improving the heat dissipation comprises a heat sink connected to the reflector so as to increase the effective cooling area.
  • the heat sink may also have a shape adapted to the reflector in the region of the connection with the reflector in order to improve the heat conduction from the reflector into the heat sink.
  • the device for improving the heat removal comprises a heat-conducting layer arranged on the reflector, in particular on the reflector outer side.
  • a heat-conducting layer arranged on the reflector, in particular on the reflector outer side.
  • a reflector can be provided with a metallic coating.
  • such a coating also ensures increased thermal shock resistance, since the heat can be distributed more rapidly to the reflector body or parts of the reflector body and temperature stresses in the reflector material can be avoided.
  • the reflector is provided with a coating comprising two layers, wherein a first layer is radiation-absorbing and a second, disposed over the first layer layer is highly thermally conductive.
  • a reflection of the radiation through the first layer can be avoided and the radiation power can be deliberately introduced into this layer, in which case the second layer ensures a more uniform temperature distribution along the coated surface.
  • this layer is also arranged on the reflector outside.
  • the device for improving the heat dissipation can also advantageously comprise a CVD and / or PVD coating of the reflector.
  • This layer may in particular comprise a radiation-absorbing and / or heat-conducting layer.
  • CVD and PVD coatings can be produced in a wide range of materials and also easily as absorbing layers. For example, for this purpose, a silicon oxide layer having a high carbon content, in particular amorphous carbon, can be deposited, which has good absorption properties.
  • the CVD coating may also include one or more metal oxides, among others, oxides of the metals titanium, tantalum and niobium are suitable. The method of PVD coating is useful to deposit about metallic layers.
  • the device for improving the heat dissipation may advantageously also comprise a metal foil brought into contact with the reflector.
  • the bringing into contact can take place, inter alia, by gluing or clamping between the reflector and another part.
  • the light-generating device also comprises air cooling to absorb heat from components of the heat removal enhancer.
  • the air cooling can itself be part of the device for improving the heat dissipation.
  • the air cooling may include, for example, a fan and / or be configured as convection cooling.
  • the light-generating device may itself comprise at least one light source or be designed accordingly for the equipment with a light source.
  • Suitable lamps are, for example, ultra-high-pressure lamps, in particular short-arc lamps, or halogen lamps.
  • the device according to the invention can also be equipped with a housing.
  • the housing may be configured for safety reasons expediently as splinter protection housing.
  • the housing may also have at least one light-protected opening through which cooling air can be supplied without light, which passes through the reflector or through recesses in this in the housing body, passes through the housing opening to the outside.
  • the device may also include a thermal connection with the reflector with thermal paste, or be connected to the reflector via a thermal paste layer with the reflector.
  • thermal compound can be introduced between the reflector and a heat sink or a heat-distributing metal foil.
  • a good thermal contact can also be achieved with a resilient and / or adapted to the shape of the reflector cup of the device for improving the heat dissipation, which conforms to the reflector.
  • plastics for the reflector, a variety of materials, such as metal, glass, or glass ceramic are suitable. Due to the inventively provided improved heat dissipation even plastics can be used. These may contain, for example, at least one of the plastics polycarbonate, polyetherimide, polymethyl methacrylate, cyclic olefin, olefin copolymer, polyethersulfone.
  • composite materials may also be used for the reflector, such as a composite material of one or more of the aforementioned plastics with a metallic material.
  • the invention also provides, to provide a reflector which is equipped with a device for improving the heat dissipation and in particular may be suitable for use in a device according to the invention.
  • the device for improving the heat dissipation of the reflector according to the invention may according to one embodiment of the invention comprise a coating of at least a portion of a surface of the reflector.
  • a preferred embodiment provides that the coating is arranged on the outside of the reflector.
  • the coating may advantageously be radiation-absorbing, in particular heat-radiation-absorbing or infrared-absorbing.
  • the coating comprises a highly thermally conductive layer in order to achieve a better distribution of the heat output on and in the reflector.
  • the device for improving the heat dissipation may also have surface-enlarging cooling structures of the reflector body, such as cooling ribs or nubs, in order to increase the cooling capacity.
  • Fig. 1 is a cross-sectional view of an embodiment of a light generating device according to the invention shown, which is designated as a whole by the reference numeral 1.
  • the light-generating device 1 comprising a reflector 2 with an inner side 4 and an outer side 6, and a device for improving the heat dissipation from the reflector 2.
  • the inner side 4 is concavely curved so that light of a light source, which in or before through the curved Inside defined cavity is arranged, is bundled by reflection from the surface of the inside 4.
  • the reflector may be made of metal, glass, glass ceramic, or plastic, or may comprise a composite material of two or more of these materials.
  • a material for a plastic reflector or a reflector with a composite reflector body in particular the plastics polycarbonate, polyetherimide, polymethylmethacrylate, cyclic olefin, olefin copolymer, or polyethersulfone can be used.
  • the reflector 2 is the in Fig. 1 shown embodiment also designed as a cold light reflector.
  • the lighting means 10 in this embodiment comprises an ultra-high pressure lamp whose Connecting legs 101, 102 are guided through recesses 12 of the reflector 2.
  • the device for improving the heat dissipation is connected to the rear side of the reflector.
  • the device for improving the heat dissipation comprises a coating 8 on the reflector outer side 6.
  • This coating is designed as a heat radiation-absorbing coating.
  • This coating can be produced for example by CVD coating of the reflector, or also comprise a PVD coating.
  • CVD and PVD coating multilayer coatings in particular can be deposited in a simple manner, for example by changing the composition of the process gas during coating.
  • Thermal radiation which is emitted by the light-emitting means 10 during operation of the device, passes through the reflector body and is then absorbed on the rear or outer side 6 by the coating 8 serving as a heat radiation-absorbing surface. This also leads to a back reflection of the heat radiation is prevented, so that through the coating 8, a reduction of the heat radiation components in the spectral distribution of the light cone emitted by the device occurs.
  • the coating 8 can also serve for improved heat distribution when the coating 8 comprises a heat-conducting layer. This not only leads to a targeted absorption of radiant energy, which can then be dissipated by the layer 8, but also among other things to an improved thermal shock resistance of the reflector. 2
  • the device for improving the heat dissipation further comprises a heat sink 16.
  • a heat sink 16 This is provided with a region of the reflector outside 6, or the coating 8 on the reflector outside 6 connected.
  • the heat sink 16 has in the region of the connection with the reflector on a receiving cup 32 for the reflector, the surface of which has a shape adapted to the reflector. This increases the contact area between heat sink 16 and reflector 2 for more effective cooling.
  • thermal connection with thermal compound 14 is present between the heat sink 2 and reflector.
  • an air cooling is provided as part of the device for improving the heat dissipation from the reflector.
  • This comprises a fan 18 which sucks in an air stream and blows on the heat sink or generates a stream of air flowing around the heat sink by sucking air from the direction of the heat sink.
  • the heat sink has a channel 24 through which the air of the fan 18 flow and can escape through openings 28 again.
  • Internal cooling fins 26 in the channel 24 provide additional heat exchange.
  • the cooling is additionally supported by external cooling fins 30.
  • the cooling fins 26 and 30 may also be different than m Fig. 1 shown schematically, along the flow direction of the air flow generated by the fan 18.
  • the heat sink can be massive, that is configured without a channel 24, which among other things reduces the production cost.
  • One Such heat sink is in perspective view in Fig. 2 shown. At the in Fig. 2 shown cylindrical heat sink 16, the cooling fins 30 extend along the axis of symmetry of the body.
  • the surface of the heat sink 16 may additionally include one or more areas of turbulence generating structures. Examples of such vortex-generating structures are defined roughnesses or depressions.
  • the light-generating device 1 comprises in the in Fig. 1 also shown, a housing 20.
  • This housing 20 may serve as splinter protection, which is particularly advantageous when using ultra-high-pressure lamps as a light source.
  • the housing 20 also has a plurality of light-shielded openings 22, which allow the exchange of air for cooling and at the same time prevent light that enters the housing, for example, through the openings 12 in the reflector 2, comes to the outside.
  • the openings 22 may be provided with suitable diaphragms which block a direct light emission.
  • a section of a coated reflector 2 is shown in cross-sectional view.
  • the substrate or the reflector body 3 is similar to that in FIG Fig. 1 shown embodiment on the reflector outer side 6 is provided with a coating 8.
  • the coating 8 is both radiation-absorbing, as well as highly thermally conductive.
  • the layer 8 comprises a first layer 81 which is applied to the reflector body 3 and a second layer 82 applied over the first layer 81.
  • the first layer 81 is radiation-absorbing, and this property applies in particular to the heat radiation components emitted by the lamp.
  • the radiation-absorbing property can be achieved, for example, by a high layer roughness and / or a sufficient proportion of amorphous carbon in the layer.
  • the arranged above second layer 81 is highly thermally conductive.
  • this layer 82 may comprise a suitable metal.
  • the first layer 81 prevents significant radiation components from being reflected back from the second layer 82 and thus again being able to provide a spectral contribution in the case of a cold-light reflector.
  • Fig. 4 shows an embodiment of a reflector 2 according to the invention, which is equipped with a device for improving the heat dissipation and can also be used in a device 1 according to the invention, as exemplified in Fig. 1 is shown.
  • the reflector comprises a reflector body 3 with a concavely curved inner side 4, which forms the reflecting surface of the reflector 2 for the light emitted by a light source, the inner surface 4 being equipped, for example, with a radiation-reflecting coating.
  • This can be embodied as an interference filter or dielectric mirror which, in the manner of a cold-light reflector, reflects visible light and transmits longer-wavelength light.
  • the device for improving the heat dissipation comprises surface-enlarging cooling structures of the reflector body 3 in the form of cooling fins 31 on the outside 6.
  • the cooling fins 31 extend in this embodiment along the example Symmetry axis of the reflector body 3. This configuration is advantageous, inter alia, if in addition an air cooling with fan is used, which generates an air flow in the direction of the axis of symmetry.
  • the reflector 2 on the outside 6 can also have vortex-generating structures in order to improve the mixing of the air during cooling.
  • openings 12 which allow the receptacles and arrangement of the bulb in the reflector in front of the inside 4.
  • the device for improving the heat dissipation comprises a coating 8 at least a portion of the outside of the reflector 2.
  • the coating 8 may be advantageous as in Fig. 3 shown coating with a lower, radiation-absorbing layer 8 and a first layer 81 covering this second layer 82, wherein the second layer 82 is highly thermally conductive and serves the temperature compensation.
  • a further embodiment of a reflector 2 according to the invention, or a light-generating device 1 is shown.
  • the lighting means 10 is integrated in the reflector 2.
  • the illuminant may, for example, as shown, a halogen bulb or again an ultra-high pressure lamp.
  • the reflector 2 is also provided on its outer side 6 with a coating 8 as part of a device for improving the heat dissipation, as in the embodiments described above.
  • the coating 8 serves for radiation absorption and may also have heat-conducting properties.
  • a heat-conductive metal foil 34 which is in contact with the reflector 2 or with its coated outside 6, is applied on the outside 6 of the reflector 2 as a further component of the device for improving the heat dissipation.
  • the metal foil 34 may be due to their flexibility and flexibility cling well to the shape of the reflector 2 and serves to better distribution of the heat output, in particular on the reflector outer side. 6
  • Fig. 6 shows a further preferred embodiment of a reflector 2 according to the invention in this embodiment, the means for improving the heat removal vortex-generating structures in the form of dimples or depressions 36, which may be circular, for example, and which are arranged on the outer surface 6 of the reflector.
  • the depressions 36 may be arranged in a regular pattern, for example in the form of a hexagonal matrix on the outer surface 6 or a partial region of the outer surface 6.
  • the recesses provide a cooling fluid, in particular air, for intensive turbulence of the fluid and thus improved heat exchange of the surface of the reflector 2 with the cooling fluid.

Description

Die Erfindung betrifft allgemein Beleuchtungsmittel, insbesondere betrifft die Erfindung eine lichterzeugende Vorrichtung mit Reflektor und kühlender Struktur.The invention relates generally to lighting means, in particular the invention relates to a light-generating device with reflector and cooling structure.

Es gibt Bestrebungen, beispielsweise auf dem Gebiet der Projektionstechnik, lichterzeugende Systeme bei gleicher oder erhöhter Leistung zu verkleinern. Dies ist unter anderem wünschenswert, um eine erhöhte Brillianz zu erreichen. Für Projektoren werden auch heute noch überwiegend konventionelle Leuchtmittel verwendet, welche beispielsweise mit Glühdrähten oder insbesondere mit Lichtbögen arbeiten. Diese Lichtquellen zeichnen sich gegenüber Lasern als hochbrilliante Quellen besonders durch die hohe Lichtleistung und die naturgetreue Farbtemperatur und einen hohen spektralen Blauanteil aus.There are efforts, for example in the field of projection technology, to reduce light-generating systems with the same or increased power. This is desirable, among other things, to achieve increased brilliance. For projectors are still predominantly conventional bulbs used, which work for example with glow wires or in particular with electric arcs. Compared to lasers as highly brilliant sources, these light sources are characterized by their high light output and lifelike color temperature and high blue spectral content.

Allerdings fällt bei derartigen Lichtquellen ein hoher Wärmeanteil ab. Aufgrund der anfallenden Wärmeleistung können die lichterzeugenden Systeme oder Vorrichtungen nicht beliebig klein gestaltet werden, um den Wärmeeintrag auf den Reflektor pro Flächeneinheit nicht zu hoch werden zu lassen. Dieses Problem verstärkt sich insbesondere auch bei Kaltlichtreflektoren, bei welchen längerwellige Strahlungsanteile nicht reflektiert werden, sondern durch den Reflektor hindurchtreten. Weitere Probleme ergeben sich durch die beim Ein- und Ausschalten entstehenden hohen Temperaturwechsel.However, with such light sources, a high proportion of heat is lost. Due to the heat output, the light-generating systems or devices can not be made arbitrarily small so as not to let the heat input to the reflector per unit area become too high. This problem is particularly pronounced in cold light reflectors, in which longer-wave radiation components are not reflected, but pass through the reflector. Further problems arise through the high temperature change that occurs when switching on and off.

Aus der EP 0 311 124 A1 ist eine therapeutische Lampe zur Biostimulation mit polarisiertem Licht bekannt, bei welcher in den Reflektor rückseitig konzentrisch angeordnete Kühlringe eingearbeitet sind.From the EP 0 311 124 A1 is a therapeutic lamp for biostimulation with polarized light known, in which the reflector concentrically arranged rear cooling rings are incorporated.

Die DE 24 37 926 A1 offenbart einen Beleuchtungskörper mit einem in einem Gehäuse angeordneten Kaltlichtspiegel-Reflektor. Im Gehäuse sind Öffnungen zur Lüftung vorgesehen, so dass Luft zwischen der Innenseite und der Aussenseite des Gehäuses zirkulieren kann. Der Reflektor ist aus metallischem Material. Eine pigmentierte glasige Beschichtung absorbiert das Infrarotlicht, welches durch die Kaltlichtspiegel-Beschichtung hindurchtritt.The DE 24 37 926 A1 discloses a lighting fixture having a cold mirror reflector disposed in a housing. Ventilation openings are provided in the housing so that air can circulate between the inside and outside of the housing. The reflector is made of metallic material. A pigmented glassy coating absorbs the infrared light passing through the cold mirror coating.

Der Erfindung liegt die Aufgabe zugrunde, ein lichterzeugendes System, insbesondere eine lichterzeugende Vorrichtung bereitzustellen, welches eine Verbesserung hinsichtlich der oben genannten Probleme.schafft. Diese Aufgabe wird bereits in höchst überraschend einfacher Weise durch den Gegenstand der unabhängigen Ansprüche gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen sind ferner in den Unteransprüchen angegeben.The invention has for its object to provide a light-generating system, in particular a light-generating device, which provides an improvement in the above-mentioned problems. This object is already achieved in a surprisingly simple manner by the subject matter of the independent claims. Advantageous embodiments and further developments are further specified in the subclaims.

Dementsprechend sieht die Erfindung eine lichterzeugende Vorrichtung vor, die einen Reflektor, sowie eine Einrichtung zur Verbesserung der Wärmeabfuhr vom Reflektor umfaßt.Accordingly, the invention provides a light-generating device comprising a reflector, and means for improving the heat dissipation from the reflector.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist eine lichterzeugende Vorrichtung vorgesehen, bei welcher die Einrichtung zur Verbesserung der Wärmeabfuhr mit der Rückseite des Reflektors verbunden oder an dieser angeordnet ist. Als Rück- oder Außenseite des Reflektors wird dabei eine dem Leuchtmittel oder dem für das Leuchtmittel vorgesehenen Ort abgewandte Seite des Reflektors verstanden.According to a preferred embodiment of the invention, a light-generating device is provided, wherein the means for improving the heat dissipation with the Rear side of the reflector is connected or arranged on this. In this case, the back or outer side of the reflector is understood to mean a side of the reflector facing away from the luminous means or the location provided for the luminous means.

Besonders vorteilhaft für eine effektivere Wärmeabfuhr ist es, wenn die Einrichtung zur Verbesserung der Wärmeabfuhr eine strahlungsabsorbierende Fläche umfaßt.It is particularly advantageous for more effective heat dissipation if the device for improving the heat removal comprises a radiation-absorbing surface.

Insbesondere kann dabei die Einrichtung zur Verbesserung der Wärmeabfuhr eine strahlungsabsorbierende Beschichtung umfassen, wobei es besonders zweckmäßig ist, wenn die Beschichtung im Infrarot-Bereich, insbesondere im spektralen Bereich der Wärmestrahlung absorbiert. Eine derartige Beschichtung kann in einfacher Weise auch auf nicht oder schwach absorbierende Materialien eines Reflektorkörpers, wie etwa einer Glaskalotte aufgebracht werden.In particular, the device for improving the heat dissipation may comprise a radiation-absorbing coating, wherein it is particularly expedient if the coating absorbs the heat radiation in the infrared range, in particular in the spectral range. Such a coating can in a simple way to not or low-absorbing materials of a reflector body, such as a glass dome are applied.

Mittels einer solchen strahlungsabsorbierenden Fläche oder Beschichtung kann die vom Reflektor emittierte oder durch den Reflektor hindurchtretende Wärmestrahlung dort gezielt absorbiert werden, so daß an der strahlungsabsorbierenden Fläche eine verbesserte Kühlung erzielt werden kann.By means of such a radiation-absorbing surface or coating, the heat radiation emitted by the reflector or passing through the reflector can be selectively absorbed there, so that improved cooling can be achieved at the radiation-absorbing surface.

Eine bevorzugte Weiterbildung sieht außerdem vor, daß die wärmestrahlungs-absorbierende Beschichtung auf der Reflektor-Außenseite angeordnet ist. Die Beschichtung kann dabei die gesamte Außenseite oder auch einen oder mehrere Teilbereiche bedecken.A preferred embodiment also provides that the heat radiation-absorbing coating is disposed on the reflector outside. The coating can cover the entire outside or one or more subregions.

Um die Wärmeabfuhr zu verbessern, umfasst eine für die Kühlung vorgesehene Fläche wirbelerzeugende Strukturen. Beispielsweise können die Strukturen auf zumindest einem Bereich der Oberfläche des Reflektor angeordnet sein. Eine bevorzugte Ausführungsform der Erfindung sieht vor, daß die wirbelerzeugenden Strukturen auf der Reflektor-Außenseite angeordnet sind.In order to improve the heat dissipation, a surface intended for cooling comprises vortex-generating structures. For example, the structures may be arranged on at least one area of the surface of the reflector. A preferred embodiment of the invention provides that the vortex-generating structures are arranged on the reflector outside.

Besonders geeignet als wirbelerzeugende Strukturen sind die erfindungsgemäß vorgesehenen Dimpel oder Vertiefungen, die beispielsweise kreisförmig sein können. Diese lassen sich einfach herstellen und sorgen bei Umströmung einer mit derartigen Strukturen ausgestatteten Fläche mit einem Kühlfluid aufgrund der Wirbelbildung für eine effektive Durchmischung kalter und heißer Fluidschichten und damit zu einem effektiveren Wärmeaustausch.Particularly suitable as vortex-generating structures are the dimples or depressions provided according to the invention, which may be, for example, circular. These can be easily produced and ensure in case of flow around a surface provided with such structures with a cooling fluid due to the vortex formation for an effective mixing of cold and hot fluid layers and thus to a more effective heat exchange.

Der Reflektor kann auch mit Vorteil mit einer selbstreinigenden Oberfläche ausgestattet sein. Diese verhindert die An- oder Ablagerung von Verunreinigungen, die unter anderem nachteilig die Wärmeabfuhr behindern können. Selbstreinigende Eigenschaften können dabei unter anderem auch durch die oben genannten wirbelbildenden Strukturen erreicht werden, wobei durch die Wirbelbildung eine Entstehung von Strömungs-Totzonen und damit die Ablagerung von Verunreinigungen, wie etwa von Staub vermieden wird.The reflector may also be advantageously equipped with a self-cleaning surface. This prevents the accumulation or deposition of impurities that Inter alia, adversely affect the heat dissipation. Self-cleaning properties can be achieved, inter alia, by the vortex-forming structures mentioned above, whereby the formation of turbulence prevents formation of flow dead zones and thus the deposition of impurities, such as dust.

Bei einer weiteren bevorzugten Weiterbildung der lichterzeugenden Vorrichtung umfaßt die Einrichtung zur Verbesserung der Wärmeabfuhr einen mit dem Reflektor verbundenen Kühlkörper, um so die effektive Kühlfläche zu vergrößern.In a further preferred development of the light-generating device, the device for improving the heat dissipation comprises a heat sink connected to the reflector so as to increase the effective cooling area.

Der Kühlkörper kann insbesondere auch im Bereich der Verbindung mit dem Reflektor eine an den Reflektor angepaßte Form aufweisen, um die Wärmeleitung vom Reflektor in den Kühlkörper hinein zu verbessern.In particular, the heat sink may also have a shape adapted to the reflector in the region of the connection with the reflector in order to improve the heat conduction from the reflector into the heat sink.

Von Vorteil ist es auch, wenn die Einrichtung zur Verbesserung der Wärmeabfuhr eine auf dem Reflektor, insbesondere auf der Reflektor-Außenseite angeordnete wärmeleitende Schicht umfaßt. Diese sorgt für eine verbesserte Verteilung und Abfuhr der anfallenden Wärmeleistung. Beispielsweise kann dazu ein Reflektor mit einer metallischen Beschichtung versehen werden. Neben einer verbesserten Wärmeabfuhr sorgt eine solche Beschichtung auch für eine erhöhte Temperaturwechselbeständigkeit, da die Wärme schneller auf den Reflektorkörper oder Teile des Reflektorkörpers verteilt werden kann und Temperaturspannungen im Reflektormaterial vermieden werden.It is also advantageous if the device for improving the heat removal comprises a heat-conducting layer arranged on the reflector, in particular on the reflector outer side. This ensures an improved distribution and dissipation of the heat output. For example, a reflector can be provided with a metallic coating. In addition to improved heat dissipation, such a coating also ensures increased thermal shock resistance, since the heat can be distributed more rapidly to the reflector body or parts of the reflector body and temperature stresses in the reflector material can be avoided.

Insbesondere ist es auch von Vorteil, wenn der Reflektor mit einer Beschichtung versehen wird, die zwei Schichten umfaßt, wobei eine erste Schicht strahlungsabsorbierend und eine zweite, über der ersten Schicht angeordnete Schicht hoch wärmeleitfähig ist. Auf diese Weise kann eine Reflexion der Strahlung durch die erste Schicht vermieden und die Strahlungsleistung gezielt in dieser Schicht eingetragen werden, wobei dann die zweite Schicht für eine gleichmäßigere Temperaturverteilung entlang der beschichteten Oberfläche sorgt. Gemäß einer Variante dieser Ausführungsform der Erfindung ist auch dieser Schicht auf der Reflektor-Außenseite angeordnet.In particular, it is also advantageous if the reflector is provided with a coating comprising two layers, wherein a first layer is radiation-absorbing and a second, disposed over the first layer layer is highly thermally conductive. In this way, a reflection of the radiation through the first layer can be avoided and the radiation power can be deliberately introduced into this layer, in which case the second layer ensures a more uniform temperature distribution along the coated surface. According to a variant of this embodiment of the invention, this layer is also arranged on the reflector outside.

Die Einrichtung zur Verbesserung der Wärmeabfuhr kann auch vorteilhaft eine CVD- und/oder PVD-Beschichtung des Reflektors umfassen. Diese Schicht kann insbesondere eine strahlungsabsorbierende und/oder wärmeleitende Schicht umfassen. CVD- und PVD-Beschichtungen lassen sich in großer Materialvielfalt und auch leicht als absorbierende Schichten herstellen. Beispielsweise kann dazu eine Siliziumoxidschicht mit hohem Kohlenstoff-Anteil, insbesondere mit amorphem Kohlenstoff abgeschieden werden, die gute Absorptionseigenschaften aufweist. Die CVD-Beschichtung kann auch eines oder mehrere Metalloxide aufweisen, wobei unter anderem Oxide der Metalle Titan, Tantal und Niob geeignet sind. Auch das Verfahren des PVD-Beschichtens ist zweckmäßig, um etwa metallische Schichten abzuscheiden.The device for improving the heat dissipation can also advantageously comprise a CVD and / or PVD coating of the reflector. This layer may in particular comprise a radiation-absorbing and / or heat-conducting layer. CVD and PVD coatings can be produced in a wide range of materials and also easily as absorbing layers. For example, for this purpose, a silicon oxide layer having a high carbon content, in particular amorphous carbon, can be deposited, which has good absorption properties. The CVD coating may also include one or more metal oxides, among others, oxides of the metals titanium, tantalum and niobium are suitable. The method of PVD coating is useful to deposit about metallic layers.

Anstelle oder zusätzlich zu einer hoch wärmeleitfähigen Beschichtung des Reflektors kann die Einrichtung zur Verbesserung der Wärmeabfuhr vorteilhaft auch eine mit dem Reflektor in Kontakt gebrachte Metallfolie umfassen. Das in Kontakt bringen kann unter anderem durch Aufkleben oder Klemmen zwischen dem Reflektor und einem weiteren Teil erfolgen.Instead of or in addition to a highly thermally conductive coating of the reflector, the device for improving the heat dissipation may advantageously also comprise a metal foil brought into contact with the reflector. The bringing into contact can take place, inter alia, by gluing or clamping between the reflector and another part.

Bevorzugt weist die lichterzeugende Vorrichtung außerdem eine Luftkühlung auf, um Wärme von Bestandteilen der Einrichtung zur Verbesserung der Wärmeabfuhr aufzunehmen. Die Luftkühlung kann selbstverständlich auch selbst Teil der Einrichtung zur Verbesserung der Wärmeabfuhr sein. Die Luftkühlung kann dabei beispielsweise einen Ventilator umfassen und/oder als Konvektionskühlung ausgestaltet sein.Preferably, the light-generating device also comprises air cooling to absorb heat from components of the heat removal enhancer. Of course, the air cooling can itself be part of the device for improving the heat dissipation. The air cooling may include, for example, a fan and / or be configured as convection cooling.

Die lichterzeugende Vorrichtung kann selbst zumindest ein Leuchtmittel umfassen oder entsprechend für die Ausrüstung mit einem Leuchtmittel ausgestaltet sein. Geeignete Leuchtmittel sind beispielsweise Ultrahochdruck-Lampen, wie insbesondere Kurzbogenlampen, oder Halogenlampen.The light-generating device may itself comprise at least one light source or be designed accordingly for the equipment with a light source. Suitable lamps are, for example, ultra-high-pressure lamps, in particular short-arc lamps, or halogen lamps.

Besondere Verbesserungen durch eine erfindungsgemäße Vorrichtung ergeben sich insbesondere auch bei der Verwendung eines Kaltlichtreflektors, da hier ein großer Teil der Wärmestrahlung durch den Reflektor hindurchtritt und hinter dem Reflektor abgeführt werden muß oder anderenfalls hinter dem Reflektor liegende Flächen stark aufheizt.Particular improvements by means of a device according to the invention also result in particular when using a cold-light reflector, since here a large part of the heat radiation passes through the reflector and has to be dissipated behind the reflector or else strongly heats surfaces lying behind the reflector.

In vorteilhafter Weiterbildung kann die erfindungsgemäße Vorrichtung auch mit einem Gehäuse ausgestattet sein. Besonders bei Verwendung von Ultrahochdruck-Lampen kann das Gehäuse aus Sicherheitsgründen zweckmäßig als Splitterschutz-Gehäuse ausgestaltet sein. Weiterhin kann das ein Gehäuse auch zumindest eine lichtgeschützte Öffnung aufweisen, durch die Kühlluft zugeführt werden kann, ohne daß Licht, welches etwa durch den Reflektor oder durch Aussparungen in diesem in den Gehäusekörper gelangt, durch die Gehäuseöffnung nach außen gelangt.In an advantageous embodiment, the device according to the invention can also be equipped with a housing. Especially when using ultrahigh-pressure lamps, the housing may be configured for safety reasons expediently as splinter protection housing. Furthermore, the housing may also have at least one light-protected opening through which cooling air can be supplied without light, which passes through the reflector or through recesses in this in the housing body, passes through the housing opening to the outside.

Um Teile der Einrichtung zur Verbesserung der Wärmeabfuhr unter Herstellung eines guten Wärmekontakts an den Reflektor anzuschließen, kann die Einrichtung auch eine thermische Verbindung mit dem Reflektor mit Wärmeleitpaste umfassen, oder mit dem Reflektor über eine Wärmeleitpasten-Schicht mit dem Reflektor verbunden sein. Beispielsweise kann Wärmeleitpaste zwischen den Reflektor und einen Kühlkörper oder einer wärmeverteilenden Metallfolie eingebracht werden.To parts of the device for improving the heat dissipation while establishing a good thermal contact with the reflector connect, the device may also include a thermal connection with the reflector with thermal paste, or be connected to the reflector via a thermal paste layer with the reflector. For example, thermal compound can be introduced between the reflector and a heat sink or a heat-distributing metal foil.

Ein guter Wärmekontakt kann auch mit einem federnden und/oder an die Form des Reflektor angepaßten Becher der Einrichtung zur Verbesserung der Wärmeabfuhr erreicht werden, welcher sich an den Reflektor anschmiegt.A good thermal contact can also be achieved with a resilient and / or adapted to the shape of the reflector cup of the device for improving the heat dissipation, which conforms to the reflector.

Für den Reflektor sind eine Vielzahl von Materialien, wie etwa Metall, Glas, oder Glaskeramik geeignet. Aufgrund der erfindungsgemäß bereitgestellten verbesserten Wärmeabfuhr können sogar Kunststoffe eingesetzt werden. Diese können beispielsweise zumindest einen der Kunststoffe Polycarbonat, Polyetherimid, Polymethylmethacrylat, zyklisches Olefin, Olefincopolymer, Polyethersulfon enthalten.For the reflector, a variety of materials, such as metal, glass, or glass ceramic are suitable. Due to the inventively provided improved heat dissipation even plastics can be used. These may contain, for example, at least one of the plastics polycarbonate, polyetherimide, polymethyl methacrylate, cyclic olefin, olefin copolymer, polyethersulfone.

Außerdem können auch Verbundmaterialien für den Reflektor verwendet werden, wie beispielsweise ein Verbundmaterial aus einem oder mehreren der vorgenannten Kunststoffe mit einem metallischen Material.In addition, composite materials may also be used for the reflector, such as a composite material of one or more of the aforementioned plastics with a metallic material.

Die Erfindung sieht außerdem auch vor, einen Reflektor bereitzustellen, der mit einer Einrichtung zur Verbesserung der Wärmeabfuhr ausgestattet ist und insbesondere auch für die Verwendung in einer erfindungsgemäßen Vorrichtung geeignet sein kann.The invention also provides, to provide a reflector which is equipped with a device for improving the heat dissipation and in particular may be suitable for use in a device according to the invention.

Die Einrichtung zur Verbesserung der Wärmeabfuhr des erfindungsgemäßen Reflektors kann gemäß einer Ausführungsform der Erfindung eine Beschichtung zumindest eines Bereiches einer Fläche des Reflektors umfassen. Eine bevorzugte Weiterbildung sieht vor, daß die Beschichtung auf der Außenseite des Reflektors angeordnet ist. Um die Wärmeabfuhr zu verbessern, kann die Beschichtung vorteilhaft strahlungsabsorbierend, insbesondere wärmestrahlungs- oder infrarot-absorbierend sein.The device for improving the heat dissipation of the reflector according to the invention may according to one embodiment of the invention comprise a coating of at least a portion of a surface of the reflector. A preferred embodiment provides that the coating is arranged on the outside of the reflector. In order to improve the heat dissipation, the coating may advantageously be radiation-absorbing, in particular heat-radiation-absorbing or infrared-absorbing.

Eine vorteilhafte Weiterbildung eines solchen Reflektors sieht vor, daß die Beschichtung eine hoch wärmeleitfähige Schicht umfaßt, um eine bessere Verteilung der Wärmeleistung auf und im Reflektor zu erreichen.An advantageous development of such a reflector provides that the coating comprises a highly thermally conductive layer in order to achieve a better distribution of the heat output on and in the reflector.

Die Einrichtung zur Verbesserung der Wärmeabfuhr kann auch oberflächenvergrößernde Kühlstrukturen des Reflektorkörpers, wie beispielsweise Kühlrippen oder Noppen aufweisen, um die Kühlleistung zu erhöhen.The device for improving the heat dissipation may also have surface-enlarging cooling structures of the reflector body, such as cooling ribs or nubs, in order to increase the cooling capacity.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen und unter Bezugnahme auf die Zeichnungen näher erläutert, wobei gleiche und ähnliche Elemente mit gleichen Bezugszeichen versehen sind und die Merkmale verschiedener Ausführungsformen miteinander kombiniert werden können.In the following the invention with reference to embodiments and with reference to the drawings will be explained in more detail, wherein the same and similar elements are provided with the same reference numerals and the features of various embodiments can be combined.

Es zeigen:

Fig. 1
eine schematische Schnittdarstellung einer Ausführungsform einer erfindungsgemäßen lichterzeugenden Vorrichtung,
Fig. 2
eine Ausführungsform eines Kühlkörpers,
Fig. 3
einen Ausschnitt eines beschichteten Reflektors im Querschnitt,
Fig. 4
eine Ausführungsform eines erfindungsgemäßen Reflektors,
Fig. 5
eine weitere Ausführungsform eines erfindungsgemäßen Reflektors mit integriertem Leuchtmittel, und
Fig. 6
eine Ausführungsform eines erfindungsgemäßen Reflektors mit wirbelerzeugenden Strukturen.
Show it:
Fig. 1
a schematic sectional view of an embodiment of a light-generating device according to the invention,
Fig. 2
an embodiment of a heat sink,
Fig. 3
a section of a coated reflector in cross section,
Fig. 4
an embodiment of an inventive reflector,
Fig. 5
a further embodiment of a reflector according to the invention with integrated light source, and
Fig. 6
An embodiment of a reflector according to the invention with vortex-generating structures.

In Fig. 1 ist eine Querschnittdarstellung durch eine Ausführungsform einer erfindungsgemäßen lichterzeugenden Vorrichtung dargestellt, die als Ganzes mit dem Bezugszeichen 1 bezeichnet ist.In Fig. 1 is a cross-sectional view of an embodiment of a light generating device according to the invention shown, which is designated as a whole by the reference numeral 1.

Die lichterzeugende Vorrichtung 1, umfaßt einen Reflektor 2 mit einer Innenseite 4 und einer Außenseite 6, sowie eine Einrichtung zur Verbesserung der Wärmeabfuhr vom Reflektor 2. Die Innenseite 4 ist konkav gekrümmt, so daß Licht eines Leuchtmittels, welches im oder vor dem durch die gekrümmte Innenseite definierten Hohlraum angeordnet ist, durch Reflexion von der Oberfläche der Innenseite 4 gebündelt wird.The light-generating device 1, comprising a reflector 2 with an inner side 4 and an outer side 6, and a device for improving the heat dissipation from the reflector 2. The inner side 4 is concavely curved so that light of a light source, which in or before through the curved Inside defined cavity is arranged, is bundled by reflection from the surface of the inside 4.

Der Reflektor kann aus Metall, Glas, Glaskeramik, oder Kunststoff gefertigt sein, oder ein Verbundmaterial aus zwei oder mehreren dieser Materialien umfassen. Als Material für einen Kunststoff-Reflektor oder einen Reflektor mit einem Verbundmaterial-Reflektorkörper können insbesondere die Kunststoffe Polycarbonat, Polyetherimid, Polymethylmethacrylat, zyklisches Olefin, Olefincopolymer, oder Polyethersulfon eingesetzt werden. Bevorzugt ist der Reflektor 2 der in Fig. 1 gezeigten Ausführungsform außerdem als Kaltlicht-Reflektor ausgeführt.The reflector may be made of metal, glass, glass ceramic, or plastic, or may comprise a composite material of two or more of these materials. As a material for a plastic reflector or a reflector with a composite reflector body, in particular the plastics polycarbonate, polyetherimide, polymethylmethacrylate, cyclic olefin, olefin copolymer, or polyethersulfone can be used. Preferably, the reflector 2 is the in Fig. 1 shown embodiment also designed as a cold light reflector.

Im Brennpunkt der konkaven Innenseite 4 der Reflektorkalotte ist ein Leuchmittel 10 angeordnet. Das Leuchtmittel 10 umfaßt in dieser Ausführungsform eine Ultrahochdruck-Lampe, deren Anschlußbeine 101, 102 durch Aussparungen 12 des Reflektors 2 geführt sind.At the focal point of the concave inner side 4 of the reflector calotte a luminous means 10 is arranged. The lighting means 10 in this embodiment comprises an ultra-high pressure lamp whose Connecting legs 101, 102 are guided through recesses 12 of the reflector 2.

Bei dieser Ausführungsform der Erfindung ist die Einrichtung zur Verbesserung der Wärmeabfuhr mit der Rückseite des Reflektors verbunden. Die Einrichtung zur Verbesserung der Wärmeabfuhr umfaßt eine Beschichtung 8 auf der Reflektor-Außenseite 6. Diese Beschichtung ist als wärmestrahlungs-absorbierende Beschichtung ausgebildet. Diese Beschichtung kann beispielsweise durch CVD-Beschichtung des Reflektors hergestellt werden, oder auch eine PVD-Beschichtung umfassen. Durch CVD- und PVD-Beschichtung können in einfacher Weise insbesondere auch mehrlagige Beschichtungen abgeschieden werden, etwa, indem bei der Beschichtung die Zusammensetzung des Prozeßgases verändert wird.In this embodiment of the invention, the device for improving the heat dissipation is connected to the rear side of the reflector. The device for improving the heat dissipation comprises a coating 8 on the reflector outer side 6. This coating is designed as a heat radiation-absorbing coating. This coating can be produced for example by CVD coating of the reflector, or also comprise a PVD coating. By means of CVD and PVD coating, multilayer coatings in particular can be deposited in a simple manner, for example by changing the composition of the process gas during coating.

Wärmestrahlung, welche im Betrieb der Vorrichtung vom Leuchtmittel 10 emittiert wird, tritt durch den Reflektorkörper hindurch und wird dann auf der Rück- oder Außenseite 6 von der als wärmestrahlungs-absorbierenden Fläche dienenden Beschichtung 8 absorbiert. Dies führt auch dazu, daß eine Rückreflexion der Wärmestrahlung verhindert wird, so daß durch die Beschichtung 8 eine Reduktion der Wärmestrahlungs-Anteile in der spektralen Verteilung des von der Vorrichtung emittierten Lichtkegels eintritt.Thermal radiation, which is emitted by the light-emitting means 10 during operation of the device, passes through the reflector body and is then absorbed on the rear or outer side 6 by the coating 8 serving as a heat radiation-absorbing surface. This also leads to a back reflection of the heat radiation is prevented, so that through the coating 8, a reduction of the heat radiation components in the spectral distribution of the light cone emitted by the device occurs.

Außer der Eigenschaft als lichtabsorbierende Fläche kann die Beschichtung 8 auch zur verbesserten Wärmeverteilung dienen, wenn die Beschichtung 8 eine wärmeleitende Schicht umfaßt. Dies führt nicht nur zu einer gezielten Absorption von Strahlungsenergie, die dann von der Schicht 8 abgeführt werden kann, sondern auch unter anderem zu einer verbesserten Temperaturwechselbeständigkeit des Reflektors 2.In addition to being a light-absorbing surface, the coating 8 can also serve for improved heat distribution when the coating 8 comprises a heat-conducting layer. This not only leads to a targeted absorption of radiant energy, which can then be dissipated by the layer 8, but also among other things to an improved thermal shock resistance of the reflector. 2

Um die im Betrieb in der Beschichtung 8 durch Absorption und Wärmeleitung anfallende Wärmeleistung abführen zu können, umfaßt die Einrichtung zur Verbesserung der Wärmeabfuhr weiterhin einen Kühlkörper 16. Dieser ist mit einem Bereich der Reflektor-Außenseite 6, beziehungsweise der Beschichtung 8 auf der Reflektor-Außenseite 6 verbunden. Der Kühlkörper 16 weist im Bereich der Verbindung mit dem Reflektor einen Aufnahmebecher 32 für den Reflektor auf, dessen Fläche eine an den Reflektor angepaßte Form hat. Damit wird die Berührungsfläche zwischen Kühlkörper 16 und Reflektor 2 für eine effektivere Kühlung vergrößert.In order to be able to dissipate the heat output occurring during operation in the coating 8 by absorption and heat conduction, the device for improving the heat dissipation further comprises a heat sink 16. This is provided with a region of the reflector outside 6, or the coating 8 on the reflector outside 6 connected. The heat sink 16 has in the region of the connection with the reflector on a receiving cup 32 for the reflector, the surface of which has a shape adapted to the reflector. This increases the contact area between heat sink 16 and reflector 2 for more effective cooling.

Um den Wärmekontakt zusätzlich zu verbessern, ist zwischen Kühlkörper 2 und Reflektor eine thermische Verbindung mit Wärmeleitpaste 14 vorhanden.In order to improve the thermal contact in addition, a thermal connection with thermal compound 14 is present between the heat sink 2 and reflector.

Außerdem ist bei dieser Ausführungsform der erfindungsgemäßen lichterzeugenden Vorrichtung eine Luftkühlung als Bestandteil der Einrichtung zur Verbesserung der Wärmeabfuhr vom Reflektor vorgesehen. Diese umfaßt einen Ventilator 18, welcher einen Luftstrom ansaugt und auf den Kühlkörper bläst oder einen den Kühlkörper umströmenden Luftstrom erzeugt, indem er Luft aus der Richtung des Kühlkörpers ansaugt. Der Kühlkörper weist einen Kanal 24 auf, durch welchen die Luft des Ventilators 18 strömen und durch Öffnungen 28 wieder entweichen kann. Innere Kühlrippen 26 im Kanal 24 sorgen für zusätzlichen Wärmeaustausch. Die Kühlung wird zusätzlich durch äußere Kühlrippen 30 unterstützt.In addition, in this embodiment of the light-generating device according to the invention an air cooling is provided as part of the device for improving the heat dissipation from the reflector. This comprises a fan 18 which sucks in an air stream and blows on the heat sink or generates a stream of air flowing around the heat sink by sucking air from the direction of the heat sink. The heat sink has a channel 24 through which the air of the fan 18 flow and can escape through openings 28 again. Internal cooling fins 26 in the channel 24 provide additional heat exchange. The cooling is additionally supported by external cooling fins 30.

Die Kühlrippen 26 und 30 können außerde,m anders als in Fig. 1 schematisch dargestellt, entlang der Strömungsrichtung des vom Ventilator 18 erzeugten Luftstroms verlaufen. Auch kann der Kühlkörper massiv, also ohne einen Kanal 24 ausgestaltet sein, was unter anderem den Fertigungsaufwand senkt. Ein derartiger Kühlkörper ist in perspektivischer Ansicht in Fig. 2 dargestellt. Bei dem in Fig. 2 gezeigten zylindrischen Kühlkörper 16 verlaufen die Kühlrippen 30 entlang der Symmetrieachse des Körpers.The cooling fins 26 and 30 may also be different than m Fig. 1 shown schematically, along the flow direction of the air flow generated by the fan 18. Also, the heat sink can be massive, that is configured without a channel 24, which among other things reduces the production cost. One Such heat sink is in perspective view in Fig. 2 shown. At the in Fig. 2 shown cylindrical heat sink 16, the cooling fins 30 extend along the axis of symmetry of the body.

Die Oberfläche des Kühlkörpers 16 kann zusätzlich eine oder mehrere Flächen mit wirbelerzeugenden Strukturen umfassen. Beispiele solcher wirbelerzeugenden Strukturen sind definierte Rauhigkeiten oder Einsenkungen.The surface of the heat sink 16 may additionally include one or more areas of turbulence generating structures. Examples of such vortex-generating structures are defined roughnesses or depressions.

Die lichterzeugende Vorrichtung 1 umfaßt in der in Fig. 1 gezeigten Ausführungsform außerdem noch ein Gehäuse 20. Dieses Gehäuse 20 kann als Splitterschutz dienen, was insbesondere bei Verwendung von Ultrahochdruck-Lampen als Leuchtmittel vorteilhaft ist.The light-generating device 1 comprises in the in Fig. 1 also shown, a housing 20. This housing 20 may serve as splinter protection, which is particularly advantageous when using ultra-high-pressure lamps as a light source.

Das Gehäuse 20 weist außerdem eine Vielzahl von lichtgeschützten Öffnungen 22 auf, welche den Luftaustausch zur Kühlung ermöglichen und gleichzeitig verhindern, daß Licht, welches beispielsweise durch die Öffnungen 12 im Reflektor 2 in das Gehäuse tritt, nach außen gelangt. Dazu können die Öffnungen 22 mit geeigneten Blenden versehen sein, die einen direkten Lichtaustritt blockieren.The housing 20 also has a plurality of light-shielded openings 22, which allow the exchange of air for cooling and at the same time prevent light that enters the housing, for example, through the openings 12 in the reflector 2, comes to the outside. For this purpose, the openings 22 may be provided with suitable diaphragms which block a direct light emission.

In Fig. 3 ist in Querschnittansicht ein Ausschnitt eines beschichteten Reflektors 2 dargestellt. Das Substrat oder der Reflektorkörper 3 ist, ähnlich wie bei der in Fig. 1 gezeigten Ausführungsform auf der Reflektor-Außenseite 6 mit einer Beschichtung 8 versehen. Die Beschichtung 8 ist sowohl strahlungsabsorbierend, als auch hoch wärmeleitend. Dazu umfaßt die Schicht 8 eine erste Schicht 81, welche auf dem Reflektorkörper 3 aufgebracht ist und eine über der ersten Schicht 81 aufgebrachte zweite Schicht 82. Die erste Schicht 81 ist strahlungsabsorbierend, wobei diese Eigenschaft insbesondere für die vom Leuchtmittel emittierten Wärmestrahlungsanteile gilt. Die strahlungsabsorbierende Eigenschaft kann zum Beispiel durch eine hohe Schichtrauhigkeit und/oder einen hinreichenden Anteil von amorphem Kohlenstoff in der Schicht erzielt werden.In Fig. 3 a section of a coated reflector 2 is shown in cross-sectional view. The substrate or the reflector body 3 is similar to that in FIG Fig. 1 shown embodiment on the reflector outer side 6 is provided with a coating 8. The coating 8 is both radiation-absorbing, as well as highly thermally conductive. For this purpose, the layer 8 comprises a first layer 81 which is applied to the reflector body 3 and a second layer 82 applied over the first layer 81. The first layer 81 is radiation-absorbing, and this property applies in particular to the heat radiation components emitted by the lamp. The radiation-absorbing property can be achieved, for example, by a high layer roughness and / or a sufficient proportion of amorphous carbon in the layer.

Die darüber angeordnete zweite Schicht 81 ist hoch wärmeleitfähig. Beispielsweise kann diese Schicht 82 ein geeignetes Metall umfassen. Die erste Schicht 81 verhindert, daß wesentliche Strahlungsanteile von der zweiten Schicht 82 zurückreflektiert werden und so beispielsweise bei einem Kaltlicht-Reflektor wieder einen spektralen Beitrag liefern können.The arranged above second layer 81 is highly thermally conductive. For example, this layer 82 may comprise a suitable metal. The first layer 81 prevents significant radiation components from being reflected back from the second layer 82 and thus again being able to provide a spectral contribution in the case of a cold-light reflector.

Fig. 4 zeigt eine Ausführungsform eines erfindungsgemäßen Reflektors 2, der mit einer Einrichtung zur Verbesserung der Wärmeabfuhr ausgestattet ist und auch in einer erfindungsgemäßen Vorrichtung 1 eingesetzt werden kann, wie sie beispielhaft in Fig. 1 gezeigt ist. Der Reflektor umfaßt einen Reflektorkörper 3 mit einer konkav gekrümmten Innenseite 4, welche die reflektierende Oberfläche des Reflektors 2 für das von einem Leuchtmittel emittierte Licht bildet, wobei die Innenfläche 4 beispielsweise mit einer strahlungsreflektierenden Beschichtung ausgestattet ist. Diese kann als Interferenzfilter oder dielektrischer Spiegel ausgeführt sein, welcher nach Art eines Kaltlichtreflektors sichtbares Licht reflektiert und längerwelliges Licht transmittieren läßt. Fig. 4 shows an embodiment of a reflector 2 according to the invention, which is equipped with a device for improving the heat dissipation and can also be used in a device 1 according to the invention, as exemplified in Fig. 1 is shown. The reflector comprises a reflector body 3 with a concavely curved inner side 4, which forms the reflecting surface of the reflector 2 for the light emitted by a light source, the inner surface 4 being equipped, for example, with a radiation-reflecting coating. This can be embodied as an interference filter or dielectric mirror which, in the manner of a cold-light reflector, reflects visible light and transmits longer-wavelength light.

Die Einrichtung zur Verbesserung der Wärmeabfuhr umfaßt bei dieser Ausführungsform oberflächenvergrößernde Kühlstrukturen des Reflektorkörpers 3 in Form von Kühlrippen 31 auf der Außenseite 6 auf. Die Kühlrippen 31 erstrecken sich bei dieser Ausführungsform beispielhaft entlang der Symmetrieachse des Reflektorkörpers 3. Diese Konfiguration ist unter anderem dann vorteilhaft, wenn zusätzlich eine Luftkühlung mit Ventilator verwendet wird, der einen Luftstrom in Richtung der Symmetrieachse erzeugt. Zusätzlich zu den Kühlrippen kann der Reflektor 2 auf der Außenseite 6 auch noch wirbelerzeugende Strukturen aufweisen, um die Durchmischung der Luft bei der Kühlung zu verbessern.In this embodiment, the device for improving the heat dissipation comprises surface-enlarging cooling structures of the reflector body 3 in the form of cooling fins 31 on the outside 6. The cooling fins 31 extend in this embodiment along the example Symmetry axis of the reflector body 3. This configuration is advantageous, inter alia, if in addition an air cooling with fan is used, which generates an air flow in the direction of the axis of symmetry. In addition to the cooling fins, the reflector 2 on the outside 6 can also have vortex-generating structures in order to improve the mixing of the air during cooling.

Im Reflektorkörper 3 sind, ähnlich wie bei der in Fig. 1 gezeigten Ausführungsform Öffnungen 12 vorhanden, welche die Aufnahmen und Anordnung des Leuchtmittels im Reflektor vor der Innenseite 4 ermöglichen.In the reflector body 3, similar to the in Fig. 1 shown embodiment openings 12 which allow the receptacles and arrangement of the bulb in the reflector in front of the inside 4.

Weiterhin umfaßt die Einrichtung zur Verbesserung der Wärmeabfuhr eine Beschichtung 8 zumindest eines Bereiches der Außenseite des Reflektors 2. Die Beschichtung 8 kann dabei vorteilhaft wie die in Fig. 3 gezeigte Beschichtung mit einer unteren, strahlungsabsorbierenden Schicht 8 und eine diese erste Schicht 81 abdeckende zweite Schicht 82, wobei die zweite Schicht 82 hoch wärmeleitfähig ist und dem Temperaturausgleich dient.Furthermore, the device for improving the heat dissipation comprises a coating 8 at least a portion of the outside of the reflector 2. The coating 8 may be advantageous as in Fig. 3 shown coating with a lower, radiation-absorbing layer 8 and a first layer 81 covering this second layer 82, wherein the second layer 82 is highly thermally conductive and serves the temperature compensation.

In Fig. 5 ist eine weitere Ausführungsform eines erfindungsgemäßen Reflektors 2, beziehungsweise einer lichterzeugenden Vorrichtung 1 dargestellt. Bei dieser Ausführungsform der Erfindung ist das Leuchtmittel 10 im Reflektor 2 integriert. Das Leuchtmittel kann beispielsweise, wie dargestellt, eine Halogenbirne oder auch wieder eine Ultrahochdruck-Lampe sein. Der Reflektor 2 ist ebenfalls wie bei den vorstehend beschriebenen Ausführungsformen auf seiner Außenseite 6 mit einer Beschichtung 8 als Bestandteil einer Einrichtung zur Verbesserung der Wärmeabfuhr versehen. Die Beschichtung 8 dient der Strahlungsabsorption und kann auch wärmeleitenden Eigenschaften haben.In Fig. 5 a further embodiment of a reflector 2 according to the invention, or a light-generating device 1 is shown. In this embodiment of the invention, the lighting means 10 is integrated in the reflector 2. The illuminant may, for example, as shown, a halogen bulb or again an ultra-high pressure lamp. The reflector 2 is also provided on its outer side 6 with a coating 8 as part of a device for improving the heat dissipation, as in the embodiments described above. The coating 8 serves for radiation absorption and may also have heat-conducting properties.

Zusätzlich zur Beschichtung 8 ist auf der Außenseite 6 des Reflektors 2 eine wärmeleitende Metallfolie 34, die mit dem Reflektor 2, beziehungsweise mit dessen beschichteter Außenseite 6 in Kontakt ist, als weiterer Bestandteil der Einrichtung zur Verbesserung der Wärmeabfuhr aufgebracht.Die Metallfolie 34 kann sich aufgrund ihrer Biegsamkeit und Flexibilität gut an die Form des Reflektors 2 anschmiegen und dient der besseren Verteilung der Wärmeleistung insbesondere auf der Reflektor-Außenseite 6.In addition to the coating 8, a heat-conductive metal foil 34, which is in contact with the reflector 2 or with its coated outside 6, is applied on the outside 6 of the reflector 2 as a further component of the device for improving the heat dissipation. The metal foil 34 may be due to their flexibility and flexibility cling well to the shape of the reflector 2 and serves to better distribution of the heat output, in particular on the reflector outer side. 6

Fig. 6 zeigt eine weitere, bevorzugte Ausführungsform eines erfindungsgemäßen Reflektors 2. Bei dieser Ausführungsform umfaßt die Einrichtung zur Verbesserung der Wärmeabfuhr wirbelerzeugende Strukturen in Form von Dimpeln oder Vertiefungen 36, die beispielsweise kreisförmig sein können und die auf der Außenfläche 6 des Reflektors angeordnet sind. Die Vertiefungen 36 können beispielsweise in eine regelmäßigen Muster, etwa in Gestalt einer hexagonalen Matrix auf der Außenfläche 6 oder einem Teilbereich der Außenfläche 6 angeordnet sein. Die Vertiefungen sorgen bei Umströmung des Reflektors mit einem Kühlfluid, wie insbesondere von Luft für eine intensive Verwirbelung des Fluids und damit für einen verbesserten Wärmeaustausch der Oberfläche des Reflektors 2 mit dem Kühlfluid. Fig. 6 shows a further preferred embodiment of a reflector 2 according to the invention in this embodiment, the means for improving the heat removal vortex-generating structures in the form of dimples or depressions 36, which may be circular, for example, and which are arranged on the outer surface 6 of the reflector. For example, the depressions 36 may be arranged in a regular pattern, for example in the form of a hexagonal matrix on the outer surface 6 or a partial region of the outer surface 6. When the reflector flows around the recesses, the recesses provide a cooling fluid, in particular air, for intensive turbulence of the fluid and thus improved heat exchange of the surface of the reflector 2 with the cooling fluid.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Lichterzeugende VorrichtungLight-generating device
22
Reflektorreflector
33
Reflektorkörperreflector body
44
Innenseite von 2Inside of 2
66
Außenseite von 2Outside of 2
88th
Wärmestrahlungs-absorbierende BeschichtungHeat radiation absorbing coating
1010
LeuchtmittelLamp
1212
Aussparung in 2Recess in 2
1414
WärmeleitpasteThermal Compounds
1616
Kühlkörperheatsink
1818
Ventilatorfan
2020
Gehäusecasing
2222
Lichtgeschützte Öffnung in 20Light-protected opening in 20
2424
Kanal in 16Channel in 16
2626
Innere Kühlrippen in 24Inner cooling fins in 24
2828
Öffnungen zu 24Openings to 24
3030
äußere Kühlrippen von 16outer cooling fins of 16
3131
Kühlrippen von 2Cooling ribs of 2
3232
Aufnahmebecher in 16Receiving cup in 16
3434
Metallfoliemetal foil
3636
wirbelerzeugende Vertiefungenvortex-producing depressions
8181
strahlungsabsorbierende Schicht von 8Radiation absorbing layer of 8
8282
hoch wärmeleitende Schicht von 8highly thermally conductive layer of 8
101,102101,102
Anschlußbeine von 10Connecting legs of 10

Claims (21)

  1. A light generating device (1) comprising a reflector (2) in form of a cold-light reflector, and means for improving heat dissipation from the reflector (2), characterized in that said means for improving heat dissipation comprises a surface area having eddy generating textures, wherein the eddy generating textures include dimples which are arranged on the outer surface (6) of the reflector (2).
  2. The light generating device according to claim 1, characterized in that the eddy generating textures comprise circular recesses (36).
  3. The light generating device according to any of the preceding claims, characterized in that the means for improving heat dissipation comprises a heat sink (16) joined to the reflector (2).
  4. The light generating device according to claim 7, characterized in that in the joining area to the reflector the heat sink has a shape adapted to the shape of the reflector.
  5. The light generating device according to any of the preceding claims, characterized by air cooling means.
  6. The light generating device according to any of the preceding claims, characterized in that the air cooling means comprises a fan or a convection cooler.
  7. The light generating device according to any of the preceding claims, characterized by at least one light source.
  8. The light generating device according to claim 7, characterized in that the light source comprises an ultra-high-pressure lamp, in particular a short arc lamp, or a halogen lamp.
  9. The light generating device according to any of the preceding claims, characterized by a splinter protection housing.
  10. The light generating device according to any of the preceding claims, characterized by a housing with at least one light-shielded opening.
  11. The light generating device according to any of the preceding claims, characterized in that said means for improving heat dissipation comprises a heat transfer paste connection to the reflector.
  12. The light generating device according to any of the preceding claims, characterized in that said means for improving heat dissipation comprises a resilient cup or a cup corresponding to the shape of the reflector and clinging to the reflector (2).
  13. The light generating device according to any of the preceding claims, characterized in that said means for improving heat dissipation comprises a metal foil (34) disposed in contact with the reflector (2).
  14. The light generating device according to any of the preceding claims, characterized in that the reflector (2) comprises at least one material of the group including metal, glass, glass ceramics, plastics.
  15. The light generating device according to claim 20, characterized in that the reflector (2) comprises a material which includes at least one plastic material of the group including polycarbonate, polyether imide, polymethyl methacrylate, cyclic olefin, olefin copolymer, polyethersulfone.
  16. The light generating device according to any of the preceding claims, characterized in that the reflector (2) comprises a composite material.
  17. The light generating device according to any of the preceding claims, characterized in that said means for improving heat dissipation comprises a CVD or PVD coating on the reflector (2).
  18. The light generating device according to any of the preceding claims, characterized in that the reflector (2) is provided with a self-cleaning surface.
  19. A reflector (2) in form of a cold light reflector, comprising means for improving heat dissipation, in particular for a device according to any of the preceding claims, characterized in that said means for improving heat dissipation comprises eddy generating textures in form of dimples which are arranged on the outer surface (6) of the reflector (2).
  20. The reflector according to claim 20, characterized in that the eddy generating textures comprise circular recesses (36).
  21. The reflector according to any of claims 20 to 21, characterized in that said means for improving heat dissipation comprises surface increasing cooling structures of the reflector body (3), for example cooling fins (31), or knobs.
EP04005058.5A 2003-04-09 2004-03-04 Light generating device with reflector Expired - Lifetime EP1467144B1 (en)

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DE10316506A DE10316506A1 (en) 2003-04-09 2003-04-09 Light generating device with reflector
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EP1467144A3 EP1467144A3 (en) 2007-07-18
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DE10316506A1 (en) 2004-11-18
JP4386782B2 (en) 2009-12-16
US20040264197A1 (en) 2004-12-30
EP1467144A3 (en) 2007-07-18
CN1550870A (en) 2004-12-01
JP2004311444A (en) 2004-11-04
EP1467144A2 (en) 2004-10-13
CN100465779C (en) 2009-03-04
US7244051B2 (en) 2007-07-17

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