EP2339225A1 - Assembly for emitting light with several point-like light sources - Google Patents

Assembly for emitting light with several point-like light sources Download PDF

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Publication number
EP2339225A1
EP2339225A1 EP09425526A EP09425526A EP2339225A1 EP 2339225 A1 EP2339225 A1 EP 2339225A1 EP 09425526 A EP09425526 A EP 09425526A EP 09425526 A EP09425526 A EP 09425526A EP 2339225 A1 EP2339225 A1 EP 2339225A1
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EP
European Patent Office
Prior art keywords
light
arrangement
light sources
emitting light
hollow body
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Granted
Application number
EP09425526A
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German (de)
French (fr)
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EP2339225B1 (en
Inventor
Melanie Hagenbring
Sascha Skergeth
Peter Roos
Patrik Gassner
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ZUMTOBEL LIGHTING GmbH
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Zumtobel Lighting GmbH Austria
Space Cannon vH Srl unipersonale
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Priority to EP09425526.2A priority Critical patent/EP2339225B1/en
Publication of EP2339225A1 publication Critical patent/EP2339225A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to an arrangement for emitting light, which has a plurality of substantially point-shaped light sources. Furthermore, the present invention relates to a luminaire with a corresponding arrangement for emitting light.
  • LEDs for lighting purposes has greatly increased in the past. Meanwhile, LEDs are used in a wide variety of application areas. Thus, both lights for interior lighting and lights in the outdoor area, such as street lights and the like, nowadays equipped with LEDs as light sources.
  • the present invention has for its object to provide a novel arrangement for emitting light with a plurality of substantially point-shaped light sources, in which the above criteria are met.
  • the solution according to the invention is based on the idea of arranging the light sources in a special manner such that the light emitted by them is not initially emitted in the light emission direction.
  • the light sources according to the present invention are arranged on the inside of a hollow body, which essentially has the shape of an ellipsoid of revolution ellipsoidal, in particular a spherical half-shell.
  • the light sources are in this case aligned such that the light emitted by them is emitted in the direction of the center of the ellipsoid of revolution, in which case the light is deflected with the aid of appropriate optical means so that it is ultimately emitted substantially parallel to the axis of rotation of the hollow body.
  • the arrangement of the light sources on the inside of a hollow body is now achieved that with a constant surface area in comparison to a planar arrangement, the number of light sources can be significantly increased. This in turn has the consequence that the total resulting luminous flux is significantly increased.
  • an arrangement for emitting light is proposed with a plurality of substantially point-shaped light sources, in particular LEDs, wherein the arrangement is characterized in that the light sources are arranged on the inside of a hollow body which has substantially the shape of a ellipsoid of revolution ellipsoidal, wherein the Light sources are aligned so that the light emitted from each light source is emitted substantially in the direction of the center of the ellipsoid of revolution, and wherein the arrangement further comprises optical means which are adapted to deflect the light of the light sources such that it is substantially parallel to Rotation axis of the hollow body is discharged.
  • the optical means provided for the desired light deflection preferably have a refractive body arranged inside the hollow body.
  • a reflector may additionally be provided, wherein the combination of refractive element and reflector is suitable for deflecting the light emitted by the light sources in the desired manner.
  • the refractive body may in particular have a light entrance surface and a light exit surface, which are connected to one another via a lateral surface, the lateral surface having a reflective coating.
  • the lateral surface which is then used to deflect the light of those light sources, which are arranged in the vicinity of the light exit opening of the arrangement, is then preferably formed frusto-conical.
  • the light sources are arranged on a common carrier element, on the outside of which means for cooling are arranged.
  • These may be active or passive cooling elements.
  • the aim of the present invention is, as already mentioned, to arrange a multiplicity of punctiform light sources in such a way that, with a relatively small space requirement, the highest possible luminous fluxes can be achieved.
  • a circular area with a diameter d is considered, on which a number N of LEDs, each having the luminous flux ⁇ , are considered.
  • N * ⁇ a luminous flux output of N * ⁇ is obtained.
  • A d 2/4 . ⁇ maintained, but the luminous flux of the entire system can be significantly increased.
  • a special arrangement of the LEDs is proposed.
  • the solution according to the invention is fundamentally based on the idea of not arranging the light sources in a common plane as hitherto usual. Instead, now the light sources on the inside of a hollow body arranged and aligned so that they emit light into the center of the hollow body, in which case the light is deflected by means of optical means in a suitable manner.
  • the light sources which are formed in the illustrated embodiment by LEDs 2, no longer arranged on a flat circular surface.
  • the LEDs 2 are arranged on the inside of a hollow body 3, which has the form of a rotational ellipsoid half shell, in particular a spherical half shell.
  • elements for cooling the arrangement can be provided on the outer surface of the hollow body 3, which consists for example of die-cast aluminum parts.
  • These may be active cooling elements and / or heat sinks, which are designed to dissipate the heat produced during operation of the LEDs 2 to the environment. For reasons of clarity, these cooling elements are not shown in the accompanying figures.
  • the arrangement of the LEDs 2 in the hollow body 3 is such that the LEDs 2 are aligned with the center of the spherical half-shell. This is located in the middle of the circular light exit surface of the arrangement.
  • the LEDs 2 are preferably formed with upstream lenses such that they direct narrow beam the light on this center. In this way, a virtual light source is generated in the center of the sphere, which emits light radially symmetrically into the upper half-space.
  • an optical device provided with the reference numeral 10 is disposed within the hollow body 3, the design of which in particular the Fig. 2 and 3 can be removed.
  • the optical device 10 consists of two components, a refractive element 11 and a reflector surface 12.
  • the embodiment of the refractive element 11 is in particular the illustration in FIG Fig. 3 removable. It has an approximately conical structure with a light entry surface 13 and a light exit surface 14. Both surfaces 13 and 14 are each curved on the inside, whereby a lens is formed.
  • Light which of the arranged in the lower part of the arrangement 1 LEDs 2 (in Fig. 1 labeled with a), enters the refractive element 11 via the light entry surface 13 and in turn leaves it via the light exit surface 14, the shape of the surfaces 13 and 14 being selected such that the light rays substantially parallel the element 11 to the axis of rotation leave.
  • An example of this is in Figure 3 the light beam A shown.
  • the light from the upper LEDs (in Fig. 1 denoted by b), however, is reflected on the lateral surface of the refractive element 11, to which it is provided with a reflective coating.
  • the here resulting reflection surface 12 is formed in a substantially cambered frusto-conical shape and has an inclination, which is such that the light rays by about 90 ° be deflected and thus in turn parallel to the axis of rotation I of the arrangement. This light path corresponds to the one in Fig. 3 shown light beam B.
  • the optical means would have to be adapted in a corresponding manner, whereby the combination consisting of reflector and refractive element need not necessarily be used. It would also be conceivable, for example, to use Fresnel lenses.
  • the arrangement shown is more effective than an arrangement with exclusive lens optics, since the flat light in the upper 1/3 can be redirected only with great effort - and thus loss of efficiency.
  • the radiation characteristic shows that this system can be used effectively more for the generation of low to wide distribution (involute, double focus) than for extremely low beam distribution.
  • Another possibility for influencing the light distribution results from the choice of isotropic or anisotropically scattering or refracting planes which can be positioned at a possible covering plane.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The light emission arrangement (1) is provided with point shaped light sources (2) arranged inside hollow body, which has a shape of a rotational ellipsoid-half shell. The light sources are designed in such a way that the light emitted from each light source is emitted in the direction of the center of the rotational ellipsoid. The optical units (10) are formed to divert the light from the light sources in such a way that it is emitted parallel to the rotational axis of the hollow body.

Description

Die vorliegende Erfindung betrifft eine Anordnung zur Lichtabgabe, welche mehrere im Wesentlichen punktförmige Lichtquellen aufweist. Ferner betrifft die vorliegende Erfindung eine Leuchte mit einer entsprechenden Anordnung zur Lichtabgabe.The present invention relates to an arrangement for emitting light, which has a plurality of substantially point-shaped light sources. Furthermore, the present invention relates to a luminaire with a corresponding arrangement for emitting light.

Der Einsatz von LEDs zu Beleuchtungszwecken hat in der Vergangenheit stark zugenommen. Mittlerweile finden LEDs in den verschiedensten Anwendungsgebieten Verwendung. So sind sowohl Leuchten zur Innenraumbeleuchtung als auch Leuchten im Außenbereich, beispielsweise Straßenleuchten und dergleichen, heutzutage mit LEDs als Lichtquellen ausgestattet.The use of LEDs for lighting purposes has greatly increased in the past. Meanwhile, LEDs are used in a wide variety of application areas. Thus, both lights for interior lighting and lights in the outdoor area, such as street lights and the like, nowadays equipped with LEDs as light sources.

Insbesondere im Bereich der Außenbeleuchtung werden in der Regel verhältnismäßig hohe Lichtströme gefordert. Gleiches gilt in der Hallenbeleuchtung sowie im Speziellen bei der Beleuchtung von Wandfassaden. Sollen in diesen Gebieten LEDs zum Einsatz kommen, so ist zwangsläufig der Einsatz einer hohen Anzahl von Lichtquellen erforderlich. Dementsprechend ist man bei der Entwicklung von Leuchten für diese Einsatzgebiete bestrebt, die LEDs so kompakt wie möglich anzuordnen und gleichzeitig für eine ausreichende Kühlung zu sorgen. Ferner sollte das Licht je nach Maßgabe des Anwendungsgebiets optisch sehr effizient in gewünschter Weise beeinflusst werden können.Especially in the field of outdoor lighting usually relatively high luminous fluxes are required. The same applies in the hall lighting and especially in the lighting of wall facades. If LEDs are to be used in these areas, the use of a large number of light sources is inevitably required. Accordingly, one strives in the development of lights for these applications, to arrange the LEDs as compact as possible and at the same time to provide sufficient cooling. Furthermore, the light should be able to be optically very efficiently influenced in the desired manner depending on the scope of the field of application.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine neuartige Anordnung zur Lichtabgabe mit einer Vielzahl von im Wesentlichen punktförmigen Lichtquellen zu schaffen, bei der die oben genannten Kriterien erfüllt sind.The present invention has for its object to provide a novel arrangement for emitting light with a plurality of substantially point-shaped light sources, in which the above criteria are met.

Die Aufgabe wird durch eine Anordnung zur Lichtabgabe, welche die Merkmale des Anspruchs 1 aufweist, gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.The object is achieved by an arrangement for emitting light, which has the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

Die erfindungsgemäße Lösung beruht auf dem Gedanken, die Lichtquellen in einer speziellen Art und Weise derart anzuordnen, dass das von ihnen abgegebene Licht zunächst nicht in Lichtabstrahlrichtung emittiert wird. Insbesondere werden die Lichtquellen gemäß der vorliegenden Erfindung an der Innenseite eines Hohlkörpers angeordnet, der im Wesentlichen die Form einer Rotationsellipsoid-Halbschale, insbesondere einer Kugelhalbschale aufweist. Die Lichtquellen sind hierbei derart ausgerichtet, dass das von ihnen abgegebene Licht in Richtung des Zentrums des Rotationsellipsoids abgestrahlt wird, wobei dann mit Hilfe entsprechender optischer Mittel das Licht derart umgelenkt wird, dass es letztendlich im Wesentlichen parallel zur Rotationsachse des Hohlkörpers abgegeben wird. Durch die Anordnung der Lichtquellen an der Innenseite eines Hohlkörpers wird nunmehr erzielt, dass bei gleichbleibender Grundfläche im Vergleich zu einer ebenen Anordnung die Anzahl der Lichtquellen deutlich erhöht werden kann. Dies wiederum hat zur Folge, dass der sich insgesamt ergebende Lichtstrom deutlich erhöht wird.The solution according to the invention is based on the idea of arranging the light sources in a special manner such that the light emitted by them is not initially emitted in the light emission direction. In particular, the light sources according to the present invention are arranged on the inside of a hollow body, which essentially has the shape of an ellipsoid of revolution ellipsoidal, in particular a spherical half-shell. The light sources are in this case aligned such that the light emitted by them is emitted in the direction of the center of the ellipsoid of revolution, in which case the light is deflected with the aid of appropriate optical means so that it is ultimately emitted substantially parallel to the axis of rotation of the hollow body. The arrangement of the light sources on the inside of a hollow body is now achieved that with a constant surface area in comparison to a planar arrangement, the number of light sources can be significantly increased. This in turn has the consequence that the total resulting luminous flux is significantly increased.

Erfindungsgemäß wird dementsprechend eine Anordnung zur Lichtabgabe mit mehreren im Wesentlichen punktförmigen Lichtquellen, insbesondere LEDs vorgeschlagen, wobei die Anordnung dadurch gekennzeichnet ist, dass die Lichtquellen an der Innenseite eines Hohlkörpers angeordnet sind, der im Wesentlichen die Form einer Rotationsellipsoid-Halbschale aufweist, wobei die Lichtquellen derart ausgerichtet sind, dass das von jeder Lichtquelle abgegebene Licht im Wesentlichen in Richtung des Zentrums des Rotationsellipsoids abgegeben wird, und wobei die Anordnung ferner optische Mittel aufweist, welche dazu ausgebildet sind, das Licht der Lichtquellen derart umzulenken, dass es im Wesentlichen parallel zur Rotationsachse des Hohlkörpers abgegeben wird.According to the invention, an arrangement for emitting light is proposed with a plurality of substantially point-shaped light sources, in particular LEDs, wherein the arrangement is characterized in that the light sources are arranged on the inside of a hollow body which has substantially the shape of a ellipsoid of revolution ellipsoidal, wherein the Light sources are aligned so that the light emitted from each light source is emitted substantially in the direction of the center of the ellipsoid of revolution, and wherein the arrangement further comprises optical means which are adapted to deflect the light of the light sources such that it is substantially parallel to Rotation axis of the hollow body is discharged.

Die zur gewünschten Lichtumlenkung vorgesehenen optischen Mittel weisen vorzugsweise einen innerhalb des Hohlkörpers angeordneten lichtbrechenden Körper auf. Ferner kann zusätzlich ein Reflektor vorgesehen sein, wobei die Kombination aus lichtbrechendem Element und Reflektor geeignet ist, dass von den Lichtquellen abgegebene Licht in gewünschter Weise umzulenken. Hierzu kann der lichtbrechende Körper insbesondere eine Lichteintrittsfläche sowie eine Lichtaustrittsfläche aufweisen, welche über eine Mantelfläche miteinander verbunden sind, wobei die Mantelfläche eine reflektierende Beschichtung aufweist. Die Mantelfläche, die dann dazu genutzt wird, das Licht derjenigen Lichtquellen umzulenken, welche in der Nähe der Lichtaustrittsöffnung der Anordnung angeordnet sind, ist dann vorzugsweise kegelstumpfartig ausgebildet.The optical means provided for the desired light deflection preferably have a refractive body arranged inside the hollow body. Furthermore, a reflector may additionally be provided, wherein the combination of refractive element and reflector is suitable for deflecting the light emitted by the light sources in the desired manner. For this purpose, the refractive body may in particular have a light entrance surface and a light exit surface, which are connected to one another via a lateral surface, the lateral surface having a reflective coating. The lateral surface, which is then used to deflect the light of those light sources, which are arranged in the vicinity of the light exit opening of the arrangement, is then preferably formed frusto-conical.

Vorzugsweise sind die Lichtquellen auf einem gemeinsamen Trägerelement angeordnet, an dessen Außenseite Mittel zur Kühlung angeordnet sind. Es kann sich hierbei um aktive oder auch passive Kühlelemente handeln.Preferably, the light sources are arranged on a common carrier element, on the outside of which means for cooling are arranged. These may be active or passive cooling elements.

Nachfolgend soll die Erfindung anhand der beiliegenden Zeichnung näher erläutert werden. Es zeigen:

Fig. 1 und 2
Ansichten einer erfindungsgemäßen Anordnung zur Lichtabgabe;
Fig. 3
eine schematische Ansicht, durch welche die Ausgestaltung der optischen Mittel zur Lichtumlenkung verdeutlich wird; und
Fig. 4
eine bei dem Ausführungsbeispiel der Fig. 1 bis 3 resultierende Lichtverteilungskurve.
The invention will be explained in more detail with reference to the accompanying drawings. Show it:
Fig. 1 and 2
Views of an arrangement according to the invention for emitting light;
Fig. 3
a schematic view through which the design of the optical means for light deflection is illustrated; and
Fig. 4
a in the embodiment of the Fig. 1 to 3 resulting light distribution curve.

Ziel der vorliegenden Erfindung ist es, wie bereits erwähnt, eine Vielzahl punktförmiger Lichtquellen derart anzuordnen, dass bei einem verhältnismäßig geringen Platzbedarf möglichst hohe Lichtströme erzielt werden können. Als Vergleichsbeispiel für die nachfolgend näher beschriebene erfindungsgemäße Lösung soll eine Kreisfläche mit einem Durchmesser d betrachtet werden, auf der eine Anzahl N von LEDs, die jeweils den Lichtstrom Φaufweisen, betrachtet werden. Bei einem derartigen System, das der klassischen Anordnung von mehreren LEDs auf einer kreisförmigen Platine entspricht, wird eine Lichtstromabgabe von N*Φ erhalten. Bei dem nachfolgend beschriebenen Ausführungsbeispiel soll diese GrundflächeThe aim of the present invention is, as already mentioned, to arrange a multiplicity of punctiform light sources in such a way that, with a relatively small space requirement, the highest possible luminous fluxes can be achieved. As a comparative example for the inventive solution described in more detail below, a circular area with a diameter d is considered, on which a number N of LEDs, each having the luminous flux Φ, are considered. In such a system, which corresponds to the classical arrangement of multiple LEDs on a circular board, a luminous flux output of N * Φ is obtained. In the embodiment described below, this base area

A = d2/4 .π beibehalten, der Lichtstrom des gesamten Systems aber deutlich erhöht werden. Hierzu wird eine spezielle Anordnung der LEDs vorgeschlagen.A = d 2/4 .π maintained, but the luminous flux of the entire system can be significantly increased. For this purpose, a special arrangement of the LEDs is proposed.

Die erfindungsgemäße Lösung beruht grundsätzlich auf dem Gedanken, die Lichtquellen nicht -wie bislang üblich - in einer gemeinsamen Ebene anzuordnen. Stattdessen werden nunmehr die Lichtquellen an der Innenseite eines Hohlkörpers angeordnet und derart ausgerichtet, dass sie in das Zentrum des Hohlkörpers Licht abgeben, wobei dann das Licht mit Hilfe von optischen Mitteln in geeigneter Weise umgelenkt wird.The solution according to the invention is fundamentally based on the idea of not arranging the light sources in a common plane as hitherto usual. Instead, now the light sources on the inside of a hollow body arranged and aligned so that they emit light into the center of the hollow body, in which case the light is deflected by means of optical means in a suitable manner.

Bei der in den Fig. 1 und 2 dargestellten erfindungsgemäßen Anordnung, welche allgemein mit dem Bezugszeichen 1 versehen ist, sind nunmehr die Lichtquellen, welche im dargestellten Ausführungsbeispiel durch LEDs 2 gebildet sind, nicht mehr auf einer ebenen Kreisfläche angeordnet. Stattdessen sind die LEDs 2 an der Innenseite eines Hohlkörpers 3 angeordnet, der die Form einer Rotationellipsoid-Halbschale, insbesondere einer Kugelhalbschale aufweist. An der Außenfläche des Hohlkörpers 3, der beispielsweise aus Aluminiumdruckgussteilen besteht, können dann insbesondere Elemente zur Kühlung der Anordnung vorgesehen sein. Es kann sich hierbei um aktive Kühlelemente und/oder Kühlkörper handeln, welche dazu ausgebildet sind, die beim Betrieb der LEDs 2 entstehende Wärme an die Umgebung abzuführen. Aus Gründen der Übersichtlichkeit sind in den beigefügten Figuren diese Kühlelemente nicht dargestellt.In the in the Fig. 1 and 2 illustrated inventive arrangement, which is generally provided with the reference numeral 1, now the light sources, which are formed in the illustrated embodiment by LEDs 2, no longer arranged on a flat circular surface. Instead, the LEDs 2 are arranged on the inside of a hollow body 3, which has the form of a rotational ellipsoid half shell, in particular a spherical half shell. On the outer surface of the hollow body 3, which consists for example of die-cast aluminum parts, then in particular elements for cooling the arrangement can be provided. These may be active cooling elements and / or heat sinks, which are designed to dissipate the heat produced during operation of the LEDs 2 to the environment. For reasons of clarity, these cooling elements are not shown in the accompanying figures.

Die Anordnung der LEDs 2 in dem Hohlkörper 3 ist derart, dass die LEDs 2 auf das Zentrum der Kugelhalbschale ausgerichtet sind. Dieses befindet sich in der Mitte der kreisförmigen Lichtaustrittsfläche der Anordnung. Die LEDs 2 sind mit vorgeordneten Linsen vorzugsweise derart ausgebildet, dass sie engstrahlend das Licht auf dieses Zentrum richten. Auf diese Weise wird im Zentrum der Kugel eine virtuelle Lichtquelle generiert, die Licht radialsymmetrisch in den oberen Halbraum abstrahlt.The arrangement of the LEDs 2 in the hollow body 3 is such that the LEDs 2 are aligned with the center of the spherical half-shell. This is located in the middle of the circular light exit surface of the arrangement. The LEDs 2 are preferably formed with upstream lenses such that they direct narrow beam the light on this center. In this way, a virtual light source is generated in the center of the sphere, which emits light radially symmetrically into the upper half-space.

Gewünscht ist nunmehr allerdings, dass das Licht möglichst parallel zur Rotationsachse der Anordnung, also nach oben abgegeben wird. Um dies zu erreichen, ist innerhalb des Hohlkörpers 3 eine mit dem Bezugszeichen 10 versehene optische Einrichtung angeordnet, deren Ausgestaltung insbesondere den Fig. 2 und 3 entnommen werden kann.However, it is now desired that the light is emitted as far as possible parallel to the axis of rotation of the arrangement, ie upwards. To achieve this, an optical device provided with the reference numeral 10 is disposed within the hollow body 3, the design of which in particular the Fig. 2 and 3 can be removed.

Die optische Einrichtung 10 besteht aus zwei Bestandteilen, einem lichtbrechenden Element 11 sowie einer Reflektorfläche 12. Die Ausgestaltung des lichtbrechenden Elements 11 ist insbesondere der Darstellung in Fig. 3 entnehmbar. Es weist eine etwa kegelförmige Struktur mit einer Lichteintrittsfläche 13 und einer Lichtaustrittsfläche 14 auf. Beide Flächen 13 und 14 sind jeweils innenseitig hin gewölbt ausgebildet, wodurch eine Linse gebildet wird.The optical device 10 consists of two components, a refractive element 11 and a reflector surface 12. The embodiment of the refractive element 11 is in particular the illustration in FIG Fig. 3 removable. It has an approximately conical structure with a light entry surface 13 and a light exit surface 14. Both surfaces 13 and 14 are each curved on the inside, whereby a lens is formed.

Licht, welches von den im unteren Bereich der Anordnung 1 angeordneten LEDs 2 (in Fig. 1 mit a bezeichnet) abgegeben wird, tritt über die Lichteintrittsfläche 13 in das lichtbrechende Element 11 ein und verlässt diese wiederum über die Lichtaustrittsfläche 14, wobei die Form der Flächen 13 und 14 derart gewählt ist, dass die Lichtstrahlen das Element 11 im Wesentlichen parallel zur Rotationsachse verlassen. Beispielhaft hierfür ist in Fig.3 der Lichtstrahl A gezeigt.Light, which of the arranged in the lower part of the arrangement 1 LEDs 2 (in Fig. 1 labeled with a), enters the refractive element 11 via the light entry surface 13 and in turn leaves it via the light exit surface 14, the shape of the surfaces 13 and 14 being selected such that the light rays substantially parallel the element 11 to the axis of rotation leave. An example of this is in Figure 3 the light beam A shown.

Das Licht der weiter oben liegenden LEDs (in Fig. 1 mit b bezeichnet) hingegen wird an der Mantelfläche des lichtbrechenden Elements 11 reflektiert, wozu diese mit einer reflektierenden Beschichtung versehen ist. Die sich hierbei ergebende Reflektionsfläche 12 ist im Wesentlichen bombiert kegelstumpfförmig ausgebildet und weist eine Neigung auf, welche derart ist, dass die Lichtstrahlen um etwa 90° umgelenkt werden und somit wiederum parallel zur Rotationsachse I der Anordnung verlaufen. Dieser Lichtweg entspricht dem in Fig. 3 gezeigten Lichtstrahl B.The light from the upper LEDs (in Fig. 1 denoted by b), however, is reflected on the lateral surface of the refractive element 11, to which it is provided with a reflective coating. The here resulting reflection surface 12 is formed in a substantially cambered frusto-conical shape and has an inclination, which is such that the light rays by about 90 ° be deflected and thus in turn parallel to the axis of rotation I of the arrangement. This light path corresponds to the one in Fig. 3 shown light beam B.

Letztendlich werden also sämtliche Strahlen, welche durch die optischen Mittel 10 beeinflusst - gebrochen oder reflektiert - werden, umgelenkt, so dass sie im Wesentlichen parallel zur Rotationsachse 1 zur Oberseite hin abgestrahlt werden. Es ergibt sich eine sehr engstrahlende Lichtvcrtcilungskurve, wie sie in Fig. 4 dargestellt ist.Ultimately, therefore, all the rays which are influenced by the optical means 10 - refracted or reflected - deflected, so that they are radiated substantially parallel to the axis of rotation 1 to the top. The result is a very narrow beam of light curve, as in Fig. 4 is shown.

Selbstverständlich könnte anstelle einer parallelen Lichtabgabe auch eine andere Lichtverteilung gewünscht sein. In diesem Fall müssten den die optischen Mittel in entsprechende weise angepasst werden, wobei nicht zwingend die Kombination bestehend aus Reflektor und lichtbrechendem Element verwendet werden muss. Denkbar wäre beispielsweise auch, Fresnellinsen einzusetzen. Die dargestellte Anordnung ist effektiver als eine Anordnung mit ausschließlicher Linsenoptik, da sich das flache Licht im oberen 1/3 nur mit großem Aufwand - und damit Wirkungsgradverlust - umlenken lässt. Die Abstrahlcharakteristik zeigt, dass dieses System effektiv eher zur Erzeugung von tief bis breitstrahlenden Verteilungen (Evolventenleuchten, Doppelfokusstrahler) verwendet werden kann als für extrem tiefstrahlende Verteilungen. Eine weitere Möglichkeit zur Beeinflussung der Lichtverteilung ergibt sich durch die Wahl von isotrop bzw, anisotrop aufstreuenden bzw. brechenden Ebenen, die bei einer eventuellen Abdeckebene positioniert werden können.Of course, a different light distribution could be desired instead of a parallel light output. In this case, the optical means would have to be adapted in a corresponding manner, whereby the combination consisting of reflector and refractive element need not necessarily be used. It would also be conceivable, for example, to use Fresnel lenses. The arrangement shown is more effective than an arrangement with exclusive lens optics, since the flat light in the upper 1/3 can be redirected only with great effort - and thus loss of efficiency. The radiation characteristic shows that this system can be used effectively more for the generation of low to wide distribution (involute, double focus) than for extremely low beam distribution. Another possibility for influencing the light distribution results from the choice of isotropic or anisotropically scattering or refracting planes which can be positioned at a possible covering plane.

Vergleicht man nunmehr die mit LEDs belegte Oberfläche des Hohlkörpers mit einer Anordnung auf einer ebenen Kreisfläche, so ergibt sich für die zu belegende Oberfläche: AHalbkugel = ½ .d2/4 . π = 2 - A. Im Vergleich zu einer Anordnung auf einer ebenen Kreisfläche können also deutlich mehr LEDs genutzt werden, so dass letztendlich der Lichtstrom stark erhöht werden kann. Trotz allem eröffnet die Anordnung die Möglichkeit, die LEDs effektiv zu kühlen, was ebenfalls einen wesentlichen Vorteil der vorliegenden Erfindung darstellt.If the surface of the hollow body occupied by LEDs is now compared with an arrangement on a flat circular surface, the result for the surface to be occupied is: A hemisphere = ½ .d 2/4 . π = 2 - A. Compared to an arrangement on a flat circular area, significantly more LEDs can be used, so that ultimately the luminous flux can be greatly increased. Nevertheless, the arrangement provides the ability to effectively cool the LEDs, which is also a significant advantage of the present invention.

Claims (9)

Anordnung (1) zur Lichtabgabe mit mehreren im Wesentlichen punktförmigen Lichtquellen (2),
dadurch gekennzeichnet,
dass die Lichtquellen (2) an der Innenseite eines Hohlkörpers (3) angeordnet sind, der im Wesentlichen die Form einer Rotationsellipsoid-Halbschale aufweist, wobei die Lichtquellen (2) derart ausgerichtet sind, dass das von jeder Lichtquelle (2) abgegebene Licht im Wesentlichen in Richtung des Zentrums des Rotationsellipsoids abgegeben wird,
und wobei die Anordnung (1) ferner optische Mittel (10) aufweist, welche dazu ausgebildet sind, das Licht der Lichtquellen (2) derart umzulenken, dass es im Wesentlichen parallel zur Rotationsachse (I) des Hohlkörpers (3) abgegeben wird.Arrangement (1) for emitting light with a plurality of substantially punctiform light sources (2),
characterized,
in that the light sources (2) are arranged on the inside of a hollow body (3) substantially in the form of an ellipsoid of revolution ellipsoidal, the light sources (2) being aligned such that the light emitted by each light source (2) substantially is delivered in the direction of the center of the ellipsoid of revolution,
and wherein the assembly (1) further comprises optical means (10) adapted to redirect the light of the light sources (2) so as to be emitted substantially parallel to the axis of rotation (I) of the hollow body (3). Anordnung zur Lichtabgabe nach Anspruch 1,
dadurch gekennzeichnet,
dass der Hohlkörper (2) die Form einer Kugelhalbschale aufweist.Arrangement for emitting light according to claim 1,
characterized,
that the hollow body (2) has the shape of a hemispherical shell. Anordnung zur Lichtabgabe nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass die optischen Mittel (10) zur Lichtumlenkung einen innerhalb des Hohlkörpers (2) angeordneten lichtbrechenden Körper (11) aufweisen.Arrangement for emitting light according to claim 1 or 2,
characterized,
in that the optical means (10) for deflecting light comprise a refractive body (11) arranged inside the hollow body (2). Anordnung zur Lichtabgabe nach Anspruch 3,
dadurch gekennzeichnet,
dass die optischen Mittel (10) zur Lichtumlenkung zusätzlich einen Reflektor (12) aufweisen.Arrangement for emitting light according to claim 3,
characterized,
in that the optical means (10) for light deflection additionally have a reflector (12). Anordnung zur Lichtabgabe nach Anspruch 4,
dadurch gekennzeichnet,
dass der lichtbrechende Körper (11) eine Lichteintrittsfläche (13) sowie eine Lichtaustrittsfläche (14) aufweist, welche über eine Mantelfläche miteinander verbunden sind, wobei die Mantelfläche eine reflektierende Beschichtung aufweist.Arrangement for emitting light according to claim 4,
characterized,
in that the refractive body (11) has a light entry surface (13) and a light exit surface (14), which are connected to one another via a lateral surface, wherein the lateral surface has a reflective coating. Anordnung zur Lichtabgabe nach Anspruch 5,
dadurch gekennzeichnet,
dass die Mantelfläche des lichtbrechenden Körpers (11) eine kegelstumpfartige Form aufweist.Arrangement for emitting light according to claim 5,
characterized,
that the lateral surface of the light-refracting body (11) has a frustoconical shape. Anordnung zur Lichtabgabe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Lichtquellen (2) auf einem - vorzugsweise gemeinsamen - Trägerelement angeordnet sind, an dessen Außenseite Mittel zur Kühlung angeordnet sind.Arrangement for emitting light according to one of the preceding claims,
characterized,
that the light sources (2) on a - are arranged support element, on its outside means are arranged for cooling - preferably common. Anordnung zur Lichtabgabe nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Lichtquellen (2) durch LEDs gebildet sind.Arrangement for emitting light according to one of the preceding claims,
characterized,
that the light sources (2) are formed by LEDs. Leuchte mit einer Anordnung zur Lichtabgabe nach einem der vorherigen Ansprüche.Luminaire with an arrangement for emitting light according to one of the preceding claims.
EP09425526.2A 2009-12-22 2009-12-22 Assembly for emitting light with several point-like light sources Active EP2339225B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09425526.2A EP2339225B1 (en) 2009-12-22 2009-12-22 Assembly for emitting light with several point-like light sources

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EP2339225A1 true EP2339225A1 (en) 2011-06-29
EP2339225B1 EP2339225B1 (en) 2016-07-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079741A1 (en) * 2011-07-25 2013-01-31 Osram Ag Lamp illumination of rooms, has control device for controlling LEDs which are arranged on surface of ball, and several flat surface portions are arranged on surface of ball
WO2022123041A1 (en) * 2020-12-11 2022-06-16 Bartenbach Holding Gmbh Light reactor and method for synthetic material production by means of light irradiation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2374919A (en) * 2001-04-27 2002-10-30 Altman Stage Lighting Co Inc Diode lighting system
GB2402998A (en) * 2002-02-12 2004-12-22 Daisho Denki Kk Lighting fixture
EP1488954A1 (en) * 2003-06-16 2004-12-22 Valeo Vision Lighting or signaling system for automotive vehicle
WO2008050783A1 (en) * 2006-10-19 2008-05-02 Panasonic Corporation Light-emitting device and display unit and lighting unit using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2374919A (en) * 2001-04-27 2002-10-30 Altman Stage Lighting Co Inc Diode lighting system
GB2402998A (en) * 2002-02-12 2004-12-22 Daisho Denki Kk Lighting fixture
EP1488954A1 (en) * 2003-06-16 2004-12-22 Valeo Vision Lighting or signaling system for automotive vehicle
WO2008050783A1 (en) * 2006-10-19 2008-05-02 Panasonic Corporation Light-emitting device and display unit and lighting unit using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079741A1 (en) * 2011-07-25 2013-01-31 Osram Ag Lamp illumination of rooms, has control device for controlling LEDs which are arranged on surface of ball, and several flat surface portions are arranged on surface of ball
WO2022123041A1 (en) * 2020-12-11 2022-06-16 Bartenbach Holding Gmbh Light reactor and method for synthetic material production by means of light irradiation

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