EP2603732B1 - Arrangement for emitting light with light-guiding element and reflector - Google Patents

Arrangement for emitting light with light-guiding element and reflector Download PDF

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Publication number
EP2603732B1
EP2603732B1 EP11757786.6A EP11757786A EP2603732B1 EP 2603732 B1 EP2603732 B1 EP 2603732B1 EP 11757786 A EP11757786 A EP 11757786A EP 2603732 B1 EP2603732 B1 EP 2603732B1
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EP
European Patent Office
Prior art keywords
light
guiding element
reflector
cylinder
arrangement
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EP11757786.6A
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German (de)
French (fr)
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EP2603732A1 (en
Inventor
Burkhard Von Kloeden
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Zumtobel Lighting GmbH Germany
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Zumtobel Lighting GmbH Germany
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    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F21V5/005—Refractors for light sources using microoptical elements for redirecting or diffusing light using microprisms
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • 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 according to the preamble of claim 1, which has at least one substantially punctiform light source, wherein the light emission by means of a light source upstream of the light-guiding element and a light-guiding element surrounding the reflector.
  • the punctual light source used is in particular an LED.
  • LEDs are increasingly being used in lighting technology, as they have numerous advantages over conventional light sources such as fluorescent lamps or light bulbs.
  • One advantage of LEDs for example, is that they emit their light predominantly in the direction in which the actual light output is to take place in a luminaire construction, ie in the direction of the light exit.
  • targeted influencing of the emitted light beams for directing the light is only possible by positioning specific optical elements directly in the region of the light emission of the LEDs. Due to the high direct component of the light emitted by LEDs and the low influenceability inevitably results in a certain amount of scattered light, which has a very disturbing effect, especially in narrow-beam distributions.
  • LED modules in which multicolor LEDs are used for example in the case of RGB modules
  • a specific color mixture is required in order ultimately to achieve homogeneous light output with a desired mixed color.
  • the present invention is accordingly based on the object, a novel concept for influencing the light output in lighting arrangements with substantially point-shaped light sources, in particular LEDs, indicate, with the help of which the above-mentioned objectives are achieved.
  • an effective influencing of the light output should be possible, on the other hand should be achieved in the case of using different colored light sources effective color mixing.
  • the solution according to the invention is based on the use of a specially designed light-guiding element, by means of which, on the one hand, an effective light steering is made possible, on the other hand, the mixing of the light emitted by the light source (s) is promoted.
  • This special light-guiding element is designed substantially cylinder-like, wherein an end face of the cylinder forms a light entry surface. One of the light entry surface opposite side of the cylinder is then at least partially aligned with respect to a longitudinal axis of the cylinder. It is thus transparent to some of the light and reflective for another part of the light, in which case the reflected portion of the light is emitted via the lateral surface of the cylinder, which is provided with structures for light extraction, to a reflector surrounding the light guide element.
  • This special design makes it possible to effectively use all the components of the light emitted by the light source.
  • an arrangement for emitting light which has at least one substantially punctiform light source, a light source in the emission direction of a light-guiding element made of a transparent material and a reflector surrounding the light guide element, wherein according to the invention, the light guide element is substantially cylindrical, wherein an end face of Cylinder forms a light entrance surface and the light inlet surface opposite side of the cylinder is at least partially inclined relative to a longitudinal axis of the cylinder such that it is transparent to a part of the light and reflective for another part of the light, and wherein the lateral surface of the cylinder with structures for Light extraction is provided.
  • LEDs are used, which may in particular be different colored LEDs.
  • the light entry surface of the light-guiding element is provided with a scattering structure, in particular a microstructure.
  • an optical element for example a foil, which has a corresponding scattering structure, in particular a microstructure, can also be provided in the region of the light entry surface.
  • the light exit surface of the light-guiding element is formed by a lateral surface a formed in the light guide element extending recess, wherein the recess is conical.
  • the cone of the cone can be selected. This can be in particular in the range between 0 ° and 45 °.
  • the light entry surface of the light-guiding element is provided with a scattering structure, or a film with a scattering structure is arranged upstream of the light entry surface of the light-directing element.
  • an asymmetrical light output can also be provided.
  • the light incident surface opposite surface of the light-guiding element, on the one hand, a refraction of light and on the other hand, a reflection takes place, preferably formed by an oblique face.
  • the reflector surrounding the light guide element according to the invention is preferably in the form of a pot. Again, the shape of the reflection surface can be changed in order to influence the light output in the desired manner.
  • the inventive arrangement makes it possible to influence the emission of light from point light sources, in particular LEDs, in a simple but effective manner.
  • luminaires with different light emission characteristics can be achieved in a simple manner, without being distinguishable from the outside at first sight.
  • Arrangement according to the invention serves to direct the light which is emitted by a plurality of punctiform light sources, in particular by LEDs.
  • LEDs in particular, differently colored LEDs - for example in the colors red, green and blue - are used in order to achieve, by controlling the intensities of the different colors, mixed light of almost any color locus or any desired color temperature.
  • the arrangement 1 can be used, for example, in so-called LED emitters.
  • Essential elements of the arrangement 1 according to the invention are on the one hand a pot-shaped reflector 2 and on the other hand a transparent light-guiding element 10, which is arranged approximately in the region of the center of the reflector 2.
  • the embodiment of the light-guiding element 10 will be described in detail below. Both elements, ie reflector 2 and light-directing element 10, are held by an annular ausgestaltetes holding element 3, via which at the same time also an attachment to or in which - not shown - housing of an LED emitter.
  • the central element of the arrangement according to the invention is the transparent light-guiding element 10, whose configuration is described below with reference to FIGS. 2 to 5 will be explained in more detail.
  • the light-guiding element 10 which consists of a light-transmitting material, preferably of a transparent plastic, is designed essentially as a cylinder.
  • the rear side of the cylinder forms a light entry surface 11 and accordingly faces the light sources.
  • a disc-shaped recess 13 is formed, which corresponds to the sectional view of FIG. 5 the recording of the LEDs 5 shown here schematically serves.
  • the light of the LEDs 5 is then coupled into the light-directing element 10 via the rear side or the corresponding light entry surface 11.
  • the light entry surface 11 is provided with a light-scattering microstructure.
  • the light-scattering effect of this structure achieves a uniform distribution of the light rays without extreme discontinuities. At the same time this ensures the desired color mixing.
  • a flat optical element for example a foil with a corresponding microstructure appeal. Also in this way, the above-mentioned uniform distribution of the light and a color mixing is achieved.
  • the forwarding of the light coupled into the light-directing element 10 then takes place essentially in two different ways, which are shown schematically in the sectional view of FIG FIG. 5 are shown.
  • the surface 15 is formed by a extending into the light guide member 10 recess 16, which is cone-shaped is trained.
  • the surface 15 is thereby formed inclined with respect to the longitudinal axis I of the cylinder and is formed by the lateral surface of the recess 16.
  • both the light rays emitted by the LEDs 5 in the direction of light emission, that is to say downwards, and the light rays emitted laterally, that is to say the scattered light of the LEDs 5, are emitted towards the bottom side.
  • the light distribution can be influenced by the choice of the opening angle of the conical recess 16.
  • the cone of the cone can be in the range between 0 ° and 45 °.
  • the structure 19 provided there is preferably configured in such a way that the Lichtlenkelement 10 laterally leaving rays are emitted as perpendicular to the longitudinal axis I as possible. This ensures that the light can be effectively deflected by the reflector 2 in the light emission direction.
  • This preferred lateral light emission is achieved in that the structure 19 is again designed as a microprism structure. In particular, this structure is formed by an alternating arrangement over the circumference of the lateral surface 18 extending grooves and projections.
  • the combination of the light-directing element 10 with the reflector 2 opens up the possibility of achieving very narrow-beam light distributions, despite which a thorough mixing of the light of the LEDs 5 is achieved.
  • FIGS. 6 to 8 A second variant of a non-inventive light-guiding element is in the FIGS. 6 to 8 shown.
  • This is a variant in which an asymmetrical light emission is achieved.
  • the surface 15 of the light-directing element 10 opposite the light entry surface 11 does not form the lateral surface of a conical recess. Instead, the surface 15 is now formed as a one-sided bevel or bevelled end face of the cylinder.
  • Part of the light rays will pass through the light-directing element 10 almost unhindered and leave via the surface 15.
  • another part of the light rays is reflected on the surface 15 and emitted to the reflector 2 via the lateral surface 18.
  • an asymmetrical light emission characteristic ultimately results, which could be used, for example, for illuminating a wall or an object arranged laterally below the LED emitter.
  • the light emitted by the LEDs is used completely for illumination, with effective mixing of the light again taking place.

Description

Die vorliegende Erfindung betrifft eine Anordnung zur Lichtabgabe gemäß dem Oberbegriff des Anspruchs 1, welche zumindest eine im Wesentlichen punktförmige Lichtquelle aufweist, wobei die Lichtabgabe mit Hilfe eines der Lichtquelle vorgeordneten Lichtlenkelements sowie eines das Lichtlenkelement umgebenden Reflektors erfolgt. Bei der zum Einsatz kommenden punktförmigen Lichtquelle handelt es sich insbesondere um eine LED.The present invention relates to an arrangement for emitting light according to the preamble of claim 1, which has at least one substantially punctiform light source, wherein the light emission by means of a light source upstream of the light-guiding element and a light-guiding element surrounding the reflector. The punctual light source used is in particular an LED.

LEDs kommen in der Beleuchtungstechnologie zunehmend zum Einsatz, da sie gegenüber herkömmlichen Lichtquellen wie Leuchtstofflampen oder Glühbirnen zahlreiche Vorteile aufweisen. Ein Vorteil von LEDs besteht beispielsweise darin, dass sie ihr Licht vorwiegend in die Richtung abgeben, in der bei einer Leuchtenkonstruktion auch die tatsächliche Lichtabgabe erfolgen soll, also in Richtung des Lichtaustritts. Hierin liegt gleichzeitig allerdings auch ein Nachteil der LEDs, da eine gezielte Beeinflussung der abgegebenen Lichtstrahlen zur Lichtlenkung nur möglich ist, indem bestimmte optische Elemente unmittelbar in dem Bereich des Lichtaustritts der LEDs positioniert werden. Durch den hohen Direktanteil des von LEDs abgegebenen Lichts und die geringe Beeinflussbarkeit ergibt sich zwangsläufig auch ein bestimmtes Maß an Streulicht, welches sich vor allem bei engstrahlenden Verteilungen sehr störend auswirkt. Weiterhin ist bei LED-Modulen, bei denen mehrfarbige LEDs zum Einsatz kommen (z. B. bei RGB-Modulen), eine gezielte Farbmischung erforderlich, um letztendlich eine homogene Lichtabgabe mit einer gewünschten Mischfarbe zu erzielen.LEDs are increasingly being used in lighting technology, as they have numerous advantages over conventional light sources such as fluorescent lamps or light bulbs. One advantage of LEDs, for example, is that they emit their light predominantly in the direction in which the actual light output is to take place in a luminaire construction, ie in the direction of the light exit. At the same time, however, there is also a disadvantage of the LEDs, since targeted influencing of the emitted light beams for directing the light is only possible by positioning specific optical elements directly in the region of the light emission of the LEDs. Due to the high direct component of the light emitted by LEDs and the low influenceability inevitably results in a certain amount of scattered light, which has a very disturbing effect, especially in narrow-beam distributions. Furthermore, in the case of LED modules in which multicolor LEDs are used (for example in the case of RGB modules), a specific color mixture is required in order ultimately to achieve homogeneous light output with a desired mixed color.

Aus der EP 1 255 306 A2 ist eine LED-Anordnung bekannt, bei der das von der LED ausgehende Licht durch eine Linse auf einen Reflektor umgelenkt wird. Eine entsprechende Vorrichtung ist auch aus der Schrift DE 10 2008 056 049 A1 bekannt.From the EP 1 255 306 A2 An LED arrangement is known in which the light emanating from the LED is deflected by a lens onto a reflector. A corresponding device is also from the Scriptures DE 10 2008 056 049 A1 known.

Aus der US 2008/0074886 A1 ist eine Licht abgebende Anordnung mit einer LED und einer Linse bekannt, bei der das von der LED abgestrahlte Licht durch die Linse zu den Seiten hin umgelenkt wird. Aus der WO 2009/149558 A1 ist eine Anordnung mit LEDs und asymmetrischen Linsen bekannt.From the US 2008/0074886 A1 For example, there is known a light emitting device having an LED and a lens in which the light emitted by the LED is redirected by the lens to the sides. From the WO 2009/149558 A1 an arrangement with LEDs and asymmetric lenses is known.

Der vorliegenden Erfindung liegt dementsprechend die Aufgabe zugrunde, ein neuartiges Konzept zur Beeinflussung der Lichtabgabe bei Beleuchtungsanordnungen mit im Wesentlichen punktförmigen Lichtquellen, insbesondere LEDs, anzugeben, mit dessen Hilfe die oben genannten Ziele erreicht werden. Insbesondere soll einerseits eine effektive Beeinflussung der Lichtabgabe möglich sein, andererseits soll im Falle der Verwendung verschiedenfarbiger Lichtquellen eine effektive Farbdurchmischung erzielt werden.The present invention is accordingly based on the object, a novel concept for influencing the light output in lighting arrangements with substantially point-shaped light sources, in particular LEDs, indicate, with the help of which the above-mentioned objectives are achieved. In particular, on the one hand an effective influencing of the light output should be possible, on the other hand should be achieved in the case of using different colored light sources effective color mixing.

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 der Verwendung eines speziell ausgestalteten Lichtlenkelements, mit dessen Hilfe einerseits eine effektive Lichtlenkung ermöglicht wird, andererseits die Durchmischung des von der bzw. den Lichtquellen abgegebenen Lichts gefördert wird. Dieses spezielle Lichtlenkelement ist im Wesentlichen zylinderartig ausgebildet, wobei eine Stirnseite des Zylinders eine Lichteintrittsfläche bildet. Eine der Lichteintrittsfläche gegenüberliegende Seite des Zylinders ist dann zumindest teilweise gegenüber einer Längsachse des Zylinders geneigt ausgerichtet. Sie ist hierdurch für einen Teil des Lichts durchlässig und für einen anderen Teil des Lichts reflektierend, wobei dann der reflektierte Anteil des Lichts über die Mantelfläche des Zylinders, welche mit Strukturen zur Lichtauskopplung versehen ist, auf einen das Lichtlenkelement umgebenden Reflektor abgegeben wird. Diese spezielle Ausgestaltung ermöglicht es, sämtliche Anteile des von der Lichtquelle abgegebenen Lichts effektiv zu nutzen.The solution according to the invention is based on the use of a specially designed light-guiding element, by means of which, on the one hand, an effective light steering is made possible, on the other hand, the mixing of the light emitted by the light source (s) is promoted. This special light-guiding element is designed substantially cylinder-like, wherein an end face of the cylinder forms a light entry surface. One of the light entry surface opposite side of the cylinder is then at least partially aligned with respect to a longitudinal axis of the cylinder. It is thus transparent to some of the light and reflective for another part of the light, in which case the reflected portion of the light is emitted via the lateral surface of the cylinder, which is provided with structures for light extraction, to a reflector surrounding the light guide element. This special design makes it possible to effectively use all the components of the light emitted by the light source.

Erfindungsgemäß wird also eine Anordnung zur Lichtabgabe vorgeschlagen, welche zumindest eine im Wesentlichen punktförmige Lichtquelle, ein der Lichtquelle in Abstrahlrichtung vorgeordnetes Lichtlenkelement aus einem transparenten Material sowie einen das Lichtlenkelement umgebenden Reflektor aufweist, wobei erfindungsgemäß das Lichtlenkelement im Wesentlichen zylinderartig ausgebildet ist, wobei eine Stirnseite des Zylinders eine Lichteintrittsfläche bildet und die der Lichteintrittsfläche gegenüberliegende Seite des Zylinders zumindest teilweise gegenüber einer Längsachse des Zylinders derart geneigt ist, dass sie für einen Teil des Lichts durchlässig und für einen anderen Teil des Lichts reflektierend ist, und wobei die Mantelfläche des Zylinders mit Strukturen zur Lichtauskopplung vorgesehen ist.According to the invention, therefore, an arrangement for emitting light is proposed, which has at least one substantially punctiform light source, a light source in the emission direction of a light-guiding element made of a transparent material and a reflector surrounding the light guide element, wherein according to the invention, the light guide element is substantially cylindrical, wherein an end face of Cylinder forms a light entrance surface and the light inlet surface opposite side of the cylinder is at least partially inclined relative to a longitudinal axis of the cylinder such that it is transparent to a part of the light and reflective for another part of the light, and wherein the lateral surface of the cylinder with structures for Light extraction is provided.

Als Lichtquellen kommen erfindungsgemäß vorzugsweise LEDs zum Einsatz, wobei es sich insbesondere um verschiedenfarbige LEDs handeln kann. Um die Mischung des von den verschiedenen LEDs abgegebenen Lichts weiter zu optimieren, ist vorzugsweise vorgesehen, dass die Lichteintrittsfläche des Lichtlenkelements mit einer streuenden Struktur, insbesondere einer Mikrostruktur versehen ist. Alternativ hierzu kann im Bereich der Lichteintrittsfläche auch ein optisches Element, beispielsweise eine Folie vorgesehen sein, welche eine entsprechende streuende Struktur, insbesondere eine Mikrostruktur aufweist.As light sources according to the invention preferably LEDs are used, which may in particular be different colored LEDs. In order to further optimize the mixture of the light emitted by the different LEDs, it is preferably provided that the light entry surface of the light-guiding element is provided with a scattering structure, in particular a microstructure. Alternatively, an optical element, for example a foil, which has a corresponding scattering structure, in particular a microstructure, can also be provided in the region of the light entry surface.

Erfindungsgemäß wird die Lichtaustrittsfläche des Lichtlenkelements, also die der Lichteintrittsfläche gegenüberliegende Seite durch eine Mantelfläche einer sich in das Lichtleitelement erstreckenden Ausnehmung gebildet, wobei die Ausnehmung kegelförmig ausgebildet ist. Je nachdem, wie engabstrahlend die Lichtabgabe erfolgen soll, kann dann der Konus des Kegels gewählt werden. Dieser kann insbesondere im Bereich zwischen 0° und 45° liegen.According to the invention, the light exit surface of the light-guiding element, that is to say the side opposite the light entry surface, is formed by a lateral surface a formed in the light guide element extending recess, wherein the recess is conical. Depending on how narrow-beam the light output is to be made, then the cone of the cone can be selected. This can be in particular in the range between 0 ° and 45 °.

Die Lichteintrittsfläche des Lichtlenkelements ist mit einer streuenden Struktur versehen oder es ist eine Folie mit einer streuenden Struktur der Lichteintrittsfläche des Lichtlenkelements vorgeordnet.The light entry surface of the light-guiding element is provided with a scattering structure, or a film with a scattering structure is arranged upstream of the light entry surface of the light-directing element.

Alternativ zu einer symmetrischen Lichtabgabe kann allerdings auch eine asymmetrische Lichtabgabe vorgesehen sein. In diesem Fall ist die der Lichteintritts fläche gegenüberliegende Fläche des Lichtlenkelements, an der einerseits eine Lichtbrechung und andererseits eine Reflexion stattfindet, vorzugsweise durch eine schräge Stirnfläche gebildet.As an alternative to a symmetrical light output, however, an asymmetrical light output can also be provided. In this case, the light incident surface opposite surface of the light-guiding element, on the one hand, a refraction of light and on the other hand, a reflection takes place, preferably formed by an oblique face.

Der das erfindungsgemäße Lichtlenkelement umgebende Reflektor ist vorzugsweise topfartig ausgebildet. Auch hier kann die Form der Reflexionsfläche verändert werden, um die Lichtabgabe in gewünschter Weise zu beeinflussen.The reflector surrounding the light guide element according to the invention is preferably in the form of a pot. Again, the shape of the reflection surface can be changed in order to influence the light output in the desired manner.

Letztendlich wird durch die erfindungsgemäße Anordnung ermöglicht, die Abgabe des Lichts von punktförmigen Lichtquellen, insbesondere von LEDs, in einfacher aber effektiver Weise zu beeinflussen. Durch die Nutzung der verschiedenen lichtlenkenden Eigenschaften der Elemente können in einfacher Weise Leuchten mit verschiedenen Lichtabstrahlcharakteristiken erzielt werden, ohne dass diese von außen auf den ersten Blick unterscheidbar sind.Finally, the inventive arrangement makes it possible to influence the emission of light from point light sources, in particular LEDs, in a simple but effective manner. By using the different light-guiding properties of the elements, luminaires with different light emission characteristics can be achieved in a simple manner, without being distinguishable from the outside at first sight.

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

Figur 1
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Anordnung zur Lichtabgabe;
Figuren 2 bis 4
Ansichten des bei dem ersten Ausführungsbeispiel zum Einsatz kommenden Lichtlenkelements;
Figur 5
eine Schnittdarstellung des Lichtlenkelements der Fig. 2 bis 4 und
Figuren 6 bis 8
Ansichten eines Ausführungsbeispiels eines Lichtlenkelements, welches nicht Teil der Erfindung ist.
The invention will be explained in more detail with reference to the accompanying drawings. Show it:
FIG. 1
a first embodiment of an inventive arrangement for light emission;
FIGS. 2 to 4
Views of the coming in the first embodiment used light-steering element;
FIG. 5
a sectional view of the light-guiding element of Fig. 2 to 4 and
FIGS. 6 to 8
Views of an embodiment of a light-guiding element, which is not part of the invention.

Die in Figur 1 allgemein mit dem Bezugszeichen 1 versehene erfindungsgemäße Anordnung dient der Lichtlenkung des Lichts, welches von mehreren punktförmigen Lichtquellen, insbesondere von LEDs abgegeben wird. Vorzugsweise kommen hierbei insbesondere verschiedenfarbige LEDs - beispielsweise in den Farben Rot, Grün und Blau - zum Einsatz, um durch Steuerung der Intensitäten der verschiedenen Farben Mischlicht eines nahezu beliebigen Farborts bzw. einer beliebigen Farbtemperatur zu erzielen. Mit Hilfe der erfindungsgemäßen Anordnung 1 wird einerseits eine besonders gute Durchmischung des Lichts der verschiedenen LEDs erzielt, andererseits kann auch das Licht effektiv in einen bestimmten Bereich gelenkt werden. Die Anordnung 1 kann beispielsweise in sog. LED-Strahlern zum Einsatz kommen.In the FIG. 1 Arrangement according to the invention, generally designated by the reference numeral 1, serves to direct the light which is emitted by a plurality of punctiform light sources, in particular by LEDs. In this case, in particular, differently colored LEDs - for example in the colors red, green and blue - are used in order to achieve, by controlling the intensities of the different colors, mixed light of almost any color locus or any desired color temperature. With the aid of the arrangement 1 according to the invention, on the one hand a particularly good mixing of the light of the different LEDs is achieved, on the other hand, the light can be effectively directed into a specific area. The arrangement 1 can be used, for example, in so-called LED emitters.

Wesentliche Elemente der erfindungsgemäßen Anordnung 1 sind zum einen ein topfförmiger Reflektor 2 sowie zum anderen ein transparentes Lichtlenkelement 10, welches etwa im Bereich des Zentrums des Reflektors 2 angeordnet ist. Die Ausgestaltung des Lichtlenkelements 10 wird nachfolgend noch detailliert beschrieben. Beide Elemente, also Reflektor 2 und Lichtlenkelement 10, werden durch ein ringförmig ausgestaltetes Halteelement 3 gehalten, über welches gleichzeitig auch eine Befestigung an bzw. in dem - nicht näher dargestellten - Gehäuse eines LED-Strahlers erfolgt.Essential elements of the arrangement 1 according to the invention are on the one hand a pot-shaped reflector 2 and on the other hand a transparent light-guiding element 10, which is arranged approximately in the region of the center of the reflector 2. The embodiment of the light-guiding element 10 will be described in detail below. Both elements, ie reflector 2 and light-directing element 10, are held by an annular ausgestaltetes holding element 3, via which at the same time also an attachment to or in which - not shown - housing of an LED emitter.

Zentrales Element der erfindungsgemäßen Anordnung ist wie bereits erwähnt das transparente Lichtlenkelement 10, dessen Ausgestaltung nachfolgend anhand der Figuren 2 bis 5 näher erläutert werden soll.As already mentioned, the central element of the arrangement according to the invention is the transparent light-guiding element 10, whose configuration is described below with reference to FIG FIGS. 2 to 5 will be explained in more detail.

Von außen betrachtet ist das Lichtlenkelement 10, welches aus einem lichtdurchlässigen Material, vorzugsweise aus einem transparenten Kunststoff besteht, im Wesentlichen als Zylinder ausgebildet. Die Rückseite des Zylinders bildet hierbei eine Lichteintrittsfläche 11 und ist dementsprechend den Lichtquellen zugewandt. Über einen umlaufenden Randbereich 12 wird eine scheibenförmige Ausnehmung 13 gebildet, welche entsprechend der Schnittdarstellung von Figur 5 der Aufnahme der hier schematisch dargestellten LEDs 5 dient. Über die Rückseite bzw. die entsprechende Lichteintrittsfläche 11 wird dann das Licht der LEDs 5 in das Lichtlenkelement 10 eingekoppelt.Viewed from the outside, the light-guiding element 10, which consists of a light-transmitting material, preferably of a transparent plastic, is designed essentially as a cylinder. The rear side of the cylinder forms a light entry surface 11 and accordingly faces the light sources. About a peripheral edge region 12, a disc-shaped recess 13 is formed, which corresponds to the sectional view of FIG. 5 the recording of the LEDs 5 shown here schematically serves. The light of the LEDs 5 is then coupled into the light-directing element 10 via the rear side or the corresponding light entry surface 11.

Wie bereits erwähnt ist es erwünscht, dass das Licht der LEDs 5 möglichst gut durchmischt wird. Um dies zu erzielen, ist vorgesehen, dass die Lichteintrittsfläche 11 mit einer lichtstreuenden Mikrostruktur versehen ist. Über die lichtstreuende Wirkung dieser Struktur wird eine gleichmäßige Verteilung der Lichtstrahlen ohne extreme Unstetigkeiten erzielt. Gleichzeitig sorgt dies für die angestrebte Farbdurchmischung. Alternativ zu der Ausführungsform, bei der die Lichteintrittsfläche 11 selbst mit der Struktur versehen ist, könnte auch vorgesehen sein, an der Bodenfläche der Ausnehmung 13, also zwischen den LEDs 5 und der Lichteintrittsfläche 11 ein flaches optisches Element, beispielsweise eine Folie mit einer entsprechenden Mikrostruktur einzulegen. Auch auf diesem Wege wird die oben genannte gleichmäßige Verteilung des Lichts und ein Farbdurchmischung erzielt.As already mentioned, it is desirable that the light of the LEDs 5 is mixed as well as possible. To achieve this, it is provided that the light entry surface 11 is provided with a light-scattering microstructure. The light-scattering effect of this structure achieves a uniform distribution of the light rays without extreme discontinuities. At the same time this ensures the desired color mixing. As an alternative to the embodiment in which the light entry surface 11 itself is provided with the structure, it would also be possible to provide on the bottom surface of the recess 13, ie between the LEDs 5 and the light entry surface 11, a flat optical element, for example a foil with a corresponding microstructure appeal. Also in this way, the above-mentioned uniform distribution of the light and a color mixing is achieved.

Die Weiterleitung des in das Lichtlenkelement 10 eingekoppelten Lichts erfolgt dann im Wesentlichen auf zwei verschiedenen Wegen, welche schematisch in der Schnittdarstellung von Figur 5 dargestellt sind.The forwarding of the light coupled into the light-directing element 10 then takes place essentially in two different ways, which are shown schematically in the sectional view of FIG FIG. 5 are shown.

Verantwortlich für die weitere Lichtleitung ist hierbei insbesondere die der Lichteintrittsfläche 11 des Lichtlenkelements 10 gegenüberliegende Fläche 15. Im dargestellten Ausführungsbeispiel, bei dem eine symmetrische Lichtabgabe angestrebt wird, wird hierbei die Fläche 15 durch eine sich in das Lichtlenkelement 10 erstreckende Ausnehmung 16 gebildet, welche kegelförmig ausgebildet ist. Die Fläche 15 ist hierdurch gegenüber der Längsachse I des Zylinders geneigt ausgebildet und wird durch die Mantelfläche der Ausnehmung 16 gebildet.In the illustrated embodiment, in which a symmetrical light output is sought, in this case the surface 15 is formed by a extending into the light guide member 10 recess 16, which is cone-shaped is trained. The surface 15 is thereby formed inclined with respect to the longitudinal axis I of the cylinder and is formed by the lateral surface of the recess 16.

Lichtstrahlen, die auf diese Fläche 15 treffen, werden nunmehr in unterschiedlicher Weise weitergeleitet. So wird ein erster Teil - repräsentiert durch den Lichtstrahl A - im Wesentlichen unverändert zur Unterseite hin abgegeben. An dem Übergang zwischen dem Lichtlenkelement 10 und der Ausnehmung 16 kann hierbei eine Brechung, also eine geringfügige Ablenkung des Lichtstrahls A stattfinden. Lichtstrahlen hingegen, welche unter einem flachen Winkel auf die Fläche 15 auftreffen (repräsentiert durch den Strahl B), werden an der Fläche 15 totalreflektiert und hierdurch auf die Mantelfläche 18 des Zylinders gerichtet. An dieser Mantelfläche 18 ist eine später noch näher beschriebene Struktur 19 vorgesehen, über welche die Lichtstrahlen ausgekoppelt und auf die Reflexionsfläche des umgebenden topfartigen Reflektors 2 gelenkt werden. Diese Lichtstrahlen werden dann von dem Reflektor 2 wiederum zur Unterseite hin reflektiert. Letztendlich werden also sowohl die von den LEDs 5 in Lichtabstrahlrichtung, also nach unten abgestrahlten Lichtstrahlen, als auch die seitlich abgegebenen Lichtstrahlen, also das Streulicht der LEDs 5 gerichtet zur Unterseite hin abgegeben. Die Lichtverteilung kann hierbei durch die Wahl des Öffnungswinkels der kegelförmigen Ausnehmung 16 beeinflusst werden. Hierbei kann der Konus des Kegels im Bereich zwischen 0° und 45° liegen.Light rays which strike this surface 15 are now transmitted in different ways. Thus, a first part - represented by the light beam A - is emitted substantially unchanged to the bottom. In this case, a refraction, that is to say a slight deflection of the light beam A, can take place at the transition between the light-directing element 10 and the recess 16. On the other hand, light rays which impinge on the surface 15 at a shallow angle (represented by the ray B) are totally reflected at the surface 15 and thereby directed towards the surface 18 of the cylinder. On this lateral surface 18, a later described structure 19 is provided, via which the light beams are coupled out and directed onto the reflection surface of the surrounding cup-shaped reflector 2. These light beams are then reflected by the reflector 2 again towards the bottom. In the end, therefore, both the light rays emitted by the LEDs 5 in the direction of light emission, that is to say downwards, and the light rays emitted laterally, that is to say the scattered light of the LEDs 5, are emitted towards the bottom side. The light distribution can be influenced by the choice of the opening angle of the conical recess 16. Here, the cone of the cone can be in the range between 0 ° and 45 °.

Zur Mantelfläche 18 des Lichtlenkelements 10 ist anzumerken, dass die dort vorgesehene Struktur 19 vorzugsweise derart ausgestaltet ist, dass die das Lichtlenkelement 10 seitlich verlassenden Strahlen möglichst senkrecht zur Längsachse I abgegeben werden. Hierdurch ist sichergestellt, dass das Licht effektiv durch den Reflektor 2 in Lichtabstrahlrichtung umgelenkt werden kann. Diese bevorzugte seitliche Lichtabgabe wird dadurch erzielt, dass die Struktur 19 wiederum als Mikroprismenstruktur ausgebildet ist. Insbesondere wird diese Struktur durch eine alternierende Anordnung über den Umfang der Mantelfläche 18 verlaufender Nuten und Vorsprünge gebildet.It should be noted with respect to the lateral surface 18 of the light-guiding element 10 that the structure 19 provided there is preferably configured in such a way that the Lichtlenkelement 10 laterally leaving rays are emitted as perpendicular to the longitudinal axis I as possible. This ensures that the light can be effectively deflected by the reflector 2 in the light emission direction. This preferred lateral light emission is achieved in that the structure 19 is again designed as a microprism structure. In particular, this structure is formed by an alternating arrangement over the circumference of the lateral surface 18 extending grooves and projections.

Letztendlich wird durch die Kombination des Lichtlenkelements 10 mit dem Reflektor 2 die Möglichkeit eröffnet, sehr engstrahlende Lichtverteilungen zu erzielen, wobei trotz allem eine gute Durchmischung des Lichts der LEDs 5 erzielt wird.Finally, the combination of the light-directing element 10 with the reflector 2 opens up the possibility of achieving very narrow-beam light distributions, despite which a thorough mixing of the light of the LEDs 5 is achieved.

Eine zweite Variante eines nicht erfindungsgemäßen Lichtlenkelements ist in den Figuren 6 bis 8 dargestellt. Es handelt sich hierbei um eine Variante, bei der eine asymmetrische Lichtabstrahlung erzielt wird. Hierzu bildet die der Lichteintrittsfläche 11 gegenüberliegende Fläche 15 des Lichtlenkelements 10 nicht die Mantelfläche einer kegelförmigen Ausnehmung. Stattdessen ist die Fläche 15 nunmehr als einseitige Schräge bzw. abgeschrägte Stirnfläche des Zylinders ausgebildet. Wie auch bei dem Ausführungsbeispiel der Figuren 1 bis 5 wird ein Teil der Lichtstrahlen das Lichtlenkelement 10 nahezu ungehindert durchstrahlen und über die Fläche 15 verlassen. Ein anderer Teil der Lichtstrahlen hingegen wird an der Fläche 15 reflektiert und über die Mantelfläche 18 auf den Reflektor 2 abgegeben werden. Bei dieser Ausführungsform ergibt sich dann letztendlich eine asymmetrische Lichtabstrahlcharakteristik, welche beispielsweise für die Beleuchtung einer Wand oder eines seitlich unterhalb des LED-Strahlers angeordneten Objekts genutzt werden könnte. Auch bei diesem zweiten Ausführungsbeispiel wird allerdings das von den LEDs abgegebene Licht vollständig zur Beleuchtung genutzt, wobei wiederum eine effektive Durchmischung des Lichts stattfindet.A second variant of a non-inventive light-guiding element is in the FIGS. 6 to 8 shown. This is a variant in which an asymmetrical light emission is achieved. For this purpose, the surface 15 of the light-directing element 10 opposite the light entry surface 11 does not form the lateral surface of a conical recess. Instead, the surface 15 is now formed as a one-sided bevel or bevelled end face of the cylinder. As in the embodiment of the FIGS. 1 to 5 Part of the light rays will pass through the light-directing element 10 almost unhindered and leave via the surface 15. On the other hand, another part of the light rays is reflected on the surface 15 and emitted to the reflector 2 via the lateral surface 18. In the case of this embodiment, an asymmetrical light emission characteristic ultimately results, which could be used, for example, for illuminating a wall or an object arranged laterally below the LED emitter. In this second exemplary embodiment, too, however, the light emitted by the LEDs is used completely for illumination, with effective mixing of the light again taking place.

Claims (6)

  1. Arrangement (1) for emitting light with at least one substantially point-shaped light source (5), a light guiding element (10) of a transparent material arranged upstream of the light source (5) in the emission direction, as well as a reflector (2) surrounding the light guiding element (10),
    wherein the light guiding element (10) is essentially cylindrical in shape, wherein
    • an end face of the cylinder forms a light entry surface (11) and
    • the sheath surface (18) of the cylinder is provided with structures (19) for light decoupling,
    wherein the side of the cylinder opposite the light entry surface (11) is at least partly inclined relative to a longitudinal axis (I) of the cylinder, so that it is transmissive to a portion of the light and is reflective to another portion of the light,
    and wherein
    the light emitting surface (15) of the light guiding element (10) formed by the inclined surface, is formed by the sheath surface (16) of a cone-shaped recess extending into the light guiding element,
    characterized in that
    the light entry surface (11) of the light guiding element (10) is provided with a diffusing structure, or a foil with a diffusing structure is arranged upstream of the light-receiving surface (11) of the light guiding element (10).
  2. Arrangement according to claim 1,
    characterized in that
    the diffusing structure is a microstructure.
  3. Arrangement according to one of the preceding claims,
    characterized in that
    the cone of the cone-shaped recess (16) lies in the range between 0° and 45°.
  4. Arrangement according to one of the preceding claims,
    characterized in that
    the reflector (2) is cup-shaped.
  5. Arrangement according to one of the preceding claims,
    characterized in that
    the light source is formed by an LED.
  6. Arrangement according to claim 5,
    characterized in that
    it has several varicolored LEDs.
EP11757786.6A 2010-08-13 2011-08-11 Arrangement for emitting light with light-guiding element and reflector Active EP2603732B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010039306A DE102010039306A1 (en) 2010-08-13 2010-08-13 Arrangement for emitting light with light guide element and reflector
PCT/EP2011/063837 WO2012020082A1 (en) 2010-08-13 2011-08-11 Arrangement for emitting light with light-guiding element and reflector

Publications (2)

Publication Number Publication Date
EP2603732A1 EP2603732A1 (en) 2013-06-19
EP2603732B1 true EP2603732B1 (en) 2017-06-07

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CN (1) CN102985751A (en)
DE (1) DE102010039306A1 (en)
WO (1) WO2012020082A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219117A1 (en) 2015-10-02 2017-04-06 Zumtobel Lighting Gmbh lights optics
DE102016201347A1 (en) * 2016-01-29 2017-08-03 Zumtobel Lighting Gmbh Optical system for influencing the light output of a light source
DE102016207143A1 (en) 2016-04-27 2017-11-02 Zumtobel Lighting Gmbh lights optics
CN111746386B (en) * 2019-03-28 2023-08-15 奥托立夫开发公司 Seat belt assembly and vehicle
JP7360012B2 (en) 2019-06-27 2023-10-12 日亜化学工業株式会社 Optical and illumination devices

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Publication number Priority date Publication date Assignee Title
US6598998B2 (en) * 2001-05-04 2003-07-29 Lumileds Lighting, U.S., Llc Side emitting light emitting device
US7369329B2 (en) * 2006-05-04 2008-05-06 Philips Lumileds Lighting Company, Llc Producing distinguishable light in the presence of ambient light
CN101150159B (en) * 2006-09-22 2011-05-11 鸿富锦精密工业（深圳）有限公司 LED and its lens body
CN101226924A (en) * 2007-01-18 2008-07-23 葳天科技股份有限公司 Quartering shot type light emitting diode
US7766509B1 (en) * 2008-06-13 2010-08-03 Lumec Inc. Orientable lens for an LED fixture
CN100595478C (en) * 2008-08-07 2010-03-24 上海亚明灯泡厂有限公司 Illuminating device and its lens used therein
DE102008056049B4 (en) * 2008-11-05 2019-01-03 Automotive Lighting Reutlingen Gmbh Light emitting device comprising at least one light emitting diode and illumination device for a motor vehicle comprising such a device

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Also Published As

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CN102985751A (en) 2013-03-20
WO2012020082A1 (en) 2012-02-16
EP2603732A1 (en) 2013-06-19
DE102010039306A1 (en) 2012-02-16

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