EP2924343A1 - Led light with refractive optics for mixing light - Google Patents

Led light with refractive optics for mixing light Download PDF

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Publication number
EP2924343A1
EP2924343A1 EP15156014.1A EP15156014A EP2924343A1 EP 2924343 A1 EP2924343 A1 EP 2924343A1 EP 15156014 A EP15156014 A EP 15156014A EP 2924343 A1 EP2924343 A1 EP 2924343A1
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EP
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Prior art keywords
leds
led
light
grid
distance
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Granted
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EP15156014.1A
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German (de)
French (fr)
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EP2924343B1 (en
Inventor
Alexander Faller
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Osram GmbH
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Osram GmbH
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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
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • 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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • 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
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • 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 a luminaire for lighting purposes, e.g. an indoor or outdoor light, which has LEDs as lighting in at least two different colors.
  • Luminaires with LED light sources ( light emitting diodes, which are also organic light emitting diodes to understand) and a transparent cover of an optically structured or diffusely scattering surface element are often constructed so that the light of the LEDs from the back hits the cover and accordingly the optical properties of the cover, the light is emitted to the light exit side.
  • a luminaire for mixing light colors is from DE 10 2012 213 046 A1 known.
  • a light module is provided, which has the LEDs on two different boards. The boards are arranged so that the LEDs of the two different colors are as close as possible to each other to produce the most homogeneous possible light mixing.
  • Object of the present invention is to provide a luminaire with LED light sources in at least two colors available, which ensures the simplest possible way a good mixing of the light colors, with a flat as possible design of the lamp can be realized.
  • a luminaire for lighting purposes with an array of LED light sources which have at least two groups of spectrally different emitting LEDs, the LEDs of each of the groups are each arranged in a regular grid and the at least two grids intermeshing in the light are arranged in a surface, wherein at a distance from said LED surface, a diffuser element, in particular a diffuser plate or a diffuser film is arranged, so that the light of the LEDs incident on the diffuser element, wherein the LEDs each individually a lens body is associated, which the light emitted by the LED expands so that the LEDs in each case in a grid in their entirety irradiate the diffuser element with a homogeneous intensity distribution, and the intensity distributions of the two grids of LEDs are superimposed on the diffuser element.
  • the lens body which are each assigned to the LEDs individually, the light of the LEDs is expanded even before it impinges on the diffuser element.
  • a homogeneous intensity distribution of each group of LEDs are generated, so that mixes the light of the two colors on the diffuser element such that color differences from human eye can no longer be perceived.
  • a homogeneous intensity distribution in this context means an intensity distribution in which the intensities of the relevant light color on the diffuser element do not differ from the mean value by more than ⁇ 10% between the brightest and the lightest weakest regions on the diffuser element, effects only in the edge region of the diffuser element Disregard diffuser element.
  • each LED of the first grid has as its nearest neighbor in the area one or more LEDs of the second grid.
  • the distance between an LED of the first grid to all nearest neighbors in the second grid can be selected to be the same size.
  • the two LED grids are arranged at an angle between 30 ° and 70 °, in particular offset by 45 ° to each other.
  • the LEDs may be the same distance apart, e.g. in an orthogonal grid.
  • the two grids with LEDs of different colors can each be made the same.
  • other configurations may also include hexagonal grids, in which also each one LED of the first color only has LEDs as nearest neighbors, which have the second color.
  • the LEDs of both grids are arranged on a different board.
  • This embodiment has the advantage that the LEDs of each color can be easily contacted via a common board in order to be able to control the LEDs of the two colors separately from one another.
  • Each of the two grids may also include multiple boards.
  • the blanks of the two grids are preferably arranged intermeshing.
  • the boards can mesh comb-shaped.
  • Other configurations provide sawtooth or serpentine lines as sinkers, each interdigitated.
  • LEDs are arranged in one color only, so that in interlocking boards preferably the nearest neighbors of an LED are again formed by LEDs of the other color.
  • the lens bodies each generate a light distribution of the LED in a sectional plane in which the optical axis of the LED is located (also referred to as C-plane in the lighting art), the two symmetrical maxima in an angular range of ⁇ 40 ° to ⁇ 80 ° , preferably between ⁇ 50 ° and ⁇ 70 °, each measured from the optical axis.
  • a light distribution which is also referred to as batwing distribution ensures good mixing of the light of adjacent LEDs, because the light distribution is relatively wide.
  • batwing distribution ensures good mixing of the light of adjacent LEDs, because the light distribution is relatively wide.
  • the light of adjacent LEDs superimposed already within a comparatively short distance to the LED surface, so that a homogeneous mixing of the light has already taken place when the light strikes the diffuser element.
  • the lens bodies each generate a rotationally symmetrical light distribution.
  • the symmetrical maxima which have been described in a sectional plane according to the previously described embodiment, can form a circulating maximum.
  • the lens bodies are designed as free-form lenses which produce a first light distribution in the main planes C0-C180 and C90-C270 and a second light distribution different from the first in the main planes C45-C225 and C135-C315, wherein in particular the second Light distribution is wider than the first light distribution.
  • the main planes C0-C180 and C90-C270 are two C-planes (ie, cut planes containing the optical axis of the LED and arranged perpendicular to the LED surface) which are at an angle of 90 °.
  • the other main planes C45-C225 and C135-C315 are accordingly defined by two cutting planes which are turned at an angle of 45 ° to the aforementioned planes.
  • Cx denotes the C-planes commonly used in lighting technology, where x denotes the azimuthal angle.
  • This embodiment has the advantage that, for example, in an orthogonal grid of LEDs, the light distribution over the diffuser element, which already emanates from each individual LED, is more uniform, because a broader light distribution in the plane takes place diagonally between the LEDs in the two grids, while a narrower light distribution in the direction of the next adjacent LED is done.
  • these free-form lenses can produce a homogeneous intensity distribution across the diffuser element for each light color, even considering that the LEDs are still spaced a relatively large distance apart and the diffuser element is relatively close is arranged to the LEDs.
  • the lens bodies of the first LED grid generate a light distribution in a sectional plane, which in each case contains the optical axis of the LED, with two maxima in symmetrical angular ranges and the lens bodies of the second LED grid each generate in a sectional plane which the optical Axis of the LEDs, a light distribution with two maxima in a symmetrical angle ranges, and the LEDs of both grids are arranged at such a distance, and the diffuser element is opposite the surface of the LEDs is arranged at such a distance that the directional beams of two maxima overlap adjacent LEDs in the cutting planes before the light impinges on the diffuser element.
  • This arrangement ensures that the light of adjacent LEDs of different colors already mixes before the light impinges on the diffuser element. This makes it possible to achieve a very homogeneous light distribution on the diffuser element.
  • the person skilled in the art will understand that the distance of the LEDs from one another, the width of the light distributions, ie the angular range in which the maxima are generated, and the distance between the LED surface and the diffuser element interact with one another in order to achieve homogeneous light mixing , In the case of a broader light distribution, for example, the distance of the LEDs from one another may be greater and the distance between the diffuser element and the LED surface may be smaller. With a further distance of the diffuser element from the LED surface, the distance of the LEDs from one another can be selected to be larger or, if necessary, the light distribution which is generated by the lens bodies can also be selected to be narrower.
  • an optically structured, transparent element is arranged on the side of the diffuser element facing away from the LEDs.
  • a prism plate or a disk provided with lenticular elevations can be arranged opposite the diffuser element.
  • This optically structured, transparent element can produce desired effects by refraction of light, in particular serve to glare the lamp. It should be understood that the mixing of the light already largely takes place in the diffuser element, while the optically structured, transparent element serves to direct the light of the already mixed-in light.
  • the distance between the diffuser element and the optically structured, transparent element can be between 1 ⁇ m and 0.5 ⁇ m, according to one embodiment.
  • the distance between the diffuser element and the optically structured, transparent element which is preferably designed in the form of an air gap, is advantageous for the properties the light control through the optically structured, transparent element to improve. If the optically structured transparent element were connected directly to the diffuser element, u. U. the refraction of light when entering the light in the optically structured, transparent element is not sufficient to achieve the desired light control. In the case of an air gap, it is ensured that, when the light enters the optically structured, transparent element, there is an optical transition from the optically thinner to an optically denser medium with the corresponding refraction of light.
  • the distance between the diffuser element and the optically structured, transparent element can also be increased.
  • an air gap between 15 mm to 30 mm may be provided. This arrangement has the advantage that the light mixing after exiting the diffuser element and before entering the optically structured, transparent element even better.
  • the distance (air gap) between the diffuser element and the optically structured, transparent element is between 0.5 mm and 20 mm.
  • the lamp has an approximately square housing, of which a sectional view FIG. 1 only a section of the bottom side 2 can be seen.
  • a number of LEDs 4 and 6 are mounted on a board (not shown).
  • the LEDs 4 and 6 each form an orthogonal grid, wherein the gratings are arranged at an angle of 45 ° to each other.
  • LEDs 4 and 6 emit light of different spectral color.
  • the luminaire is designed so that the light colors of the LEDs are mixed so well that the observer can not perceive the color difference between the LEDs on a diffuser element from the outside.
  • the diffuser element 8 is arranged, which is formed in the embodiment shown as a lens.
  • the diffuser 8 has frosted surfaces, so that the light passing through the diffuser 8 is evenly distributed.
  • FIG. 1 As in the sectional drawing FIG. 1 can be seen, a lens element 10 is arranged above each LED 4 and 6, respectively.
  • the lens element 10 influences the light distribution of each individual LED.
  • the light distributions of the LEDs are shown schematically by dashed lines. It can be seen that, contrary to the normal beam characteristic of an LED, namely as a Lambert radiator, the light distribution in the illustrated section is wider and has two symmetrical maxima.
  • the light distribution of an LED is shown in the C0-C180 plane of the luminaire.
  • the light distribution has two symmetrical maxima at ⁇ 63 °.
  • the lens body 10 are rotationally symmetrical.
  • the line on which the maxima of the light distribution are approximately at the level of the diffuser element, are in the FIG. 2 shown as dashed circles.
  • a homogeneous intensity distribution is to be understood as a distribution whose intensity maxima and intensity minima do not fluctuate more than ⁇ 10%. Due to the wide expansion of the light distribution of each individual LED, the mixing of the light within the distance h can be achieved. Compared to a lamp without lens body, which contains no expansion of the light distribution, therefore, the diffuser element 8 can be mounted at a much closer distance h to the lights. Without the lens elements 10, the diffuser element would have to be attached to the LEDs at a much greater distance h to produce a homogeneous intensity distribution because the emitted light would require a longer distance for mixing.
  • the LEDs in the plane 2 are each arranged in an orthogonal grid, wherein the two gratings are in one another.
  • the distance to the next neighbor along the orthogonal main axes a and b are the same size.
  • the grids are therefore offset by 45 ° to each other. This corresponds to a preferred embodiment.
  • hexagonal structures for example, may also be used. Even with these grids, it is possible that the next neighbor of each LED forms a spectrally different emitting LED, while the neighbor next neighbor again forms a spectrally gleichabstrahlende LED.
  • the lens elements generate a rotationally symmetric light distribution about the optical axis of the LED.
  • a deviating light distribution can be generated.
  • the orthogonal grating of this embodiment for example, a light distribution which is wider in the axes diagonal to the main axes of the orthogonal grating than that parallel to the main axes of the orthogonal grating is preferable.
  • the dashed circles are approximately one square.
  • the homogeneity of the intensity distribution on the diffuser element can be further improved for a given grating spacing a or b and for a given distance h.
  • the lens bodies of this embodiment produce a broader light distribution in the main planes C45-C225 and C135-C315 than in the main planes C0-C180 and C90-C270.
  • FIG. 4 For the realization of the two telescoped orthogonal gratings of LEDs of different colors, a circuit arrangement as in FIG. 4 shown selected according to an embodiment of the invention.
  • a plurality of LEDs of the same color are arranged comb-shaped in a circuit and pushed together with a same arrangement of LEDs of the other spectral color.
  • the LEDs 4 and 6 may each be arranged on a separate board, which mesh with each other like a comb.
  • This type of electrical contacting has the advantage that the LEDs of the two colors can be controlled differently from each other. By different dimming of the two LED grid can therefore produce different mixed colors with the lamp. Since each group of LEDs already produces an approximately homogeneous light distribution on the diffuser element 8, each mixed color is distributed homogeneously on the diffuser element, so that the viewer always perceives a lamp in a uniform color.
  • each board strip comprises only one group of LEDs each having the same spectral light emission.
  • FIG. 7 which represents a further embodiment of the invention, corresponds to the illustration in FIG. 1 ,
  • an optically structured, transparent element 12 is provided on the side of the diffuser element 8 facing away from the LEDs.
  • the optically structured, transparent element 12 has a prism structure on the light exit side, which in the FIG. 7 in the sectional drawing in the direction perpendicular to the longitudinal extent of the prisms can be seen. These prisms ensure refraction of the light due to refraction of light, because the diffusely emitted light of the diffuser element is deflected by refraction of light to the prisms. Preference is given to a light emission with a shield above a critical angle, for example between 50 ° and 70 ° with respect to the surface normal of the light exit surface.
  • the optically structured, transparent element according to another embodiment may also have lenticular elevations instead of prisms.
  • cones or prisms or truncated cones or prisms are also possible, e.g. to create a shield in two orthogonal directions.
  • the optically structured, transparent element 12 of FIG. 7 is arranged at a distance c from the diffuser element 8. This distance, which is formed in the form of an air gap, is preferred so that the light which enters the optically structured, transparent element already undergoes a refraction of light from an optically thinner to an optically denser medium. If the optically structured, transparent element 12 were mounted directly adjacent to the diffuser element 8, the effectiveness of this element 12 would be reduced because the refraction of light at the interface between air and the material of the transparent element 12 is eliminated.
  • FIG. 8 shows a further variant of the embodiment according to FIG. 7
  • the distance d between the diffuser element 8 and the optically structured, transparent element 12 is increased.
  • This embodiment has the advantage that in the region between the diffuser element 8 and the optically structured, transparent element 12 remains a greater distance in which a further light mixing can take place.
  • a distance-optimized arrangement between the diffuser element 8 and the optically structured, transparent element 12, an air gap between 0.5 mm to 20 mm is formed.
  • the invention is not limited to orthogonal gratings, but other regular grating types may be provided (especially hexagonal).
  • the invention is not limited to two groups of different spectrally radiating LEDs. According to an alternative embodiment, three or more groups of different spectrally emitting LEDs may also be used.

Abstract

Die Erfindung betrifft eine Leuchte für Beleuchtungszwecke mit einer Anordnung von LED-Lichtquellen, welche wenigstens zwei Gruppen von spektral unterschiedlich abstrahlenden LEDs (4,6) aufweisen, wobei die LEDs jeder der Gruppen jeweils in einem regelmäßigen Gitter angeordnet sind und die wenigstens zwei Gitter ineinandergreifend in der Leuchte in einer Fläche (2) angeordnet sind, wobei in einem Abstand zu besagter LED-Fläche (2) ein Diffusorelement (8), insbesondere eine Diffusorscheibe oder eine Diffusorfolie, angeordnet ist, so dass das Licht der LEDs (4,6) auf das Diffusorelement einfällt, wobei den LEDs (4,6) jeweils einzeln ein Linsenköiper (10) zugeordnet ist, welcher das von der LED abgegebene Licht derart aufweitet, dass die LEDs jeweils eines Gitters in ihrer Gesamtheit das Diffusorelement mit einer homogenen Intensitätsverteilung bestrahlen, und die Intensitätsverteilungen der beiden Gitter von LEDs sich auf dem Diffusorelement überlagern.The invention relates to a luminaire for lighting purposes with an array of LED light sources having at least two groups of spectrally different emitting LEDs (4,6), wherein the LEDs of each of the groups are each arranged in a regular grid and the at least two meshes intermeshing in the luminaire in a surface (2) are arranged, wherein at a distance from said LED surface (2) a diffuser element (8), in particular a diffuser disc or a diffuser film, is arranged, so that the light of the LEDs (4,6 ) is incident on the diffuser element, the LEDs (4,6) each having a Linsenköiper (10) is assigned, which expands the light emitted by the LED light such that the LEDs each of a grid in their entirety irradiate the diffuser element with a homogeneous intensity distribution , and the intensity distributions of the two grids of LEDs overlap on the diffuser element.

Description

Die vorliegende Erfindung betrifft eine Leuchte für Beleuchtungszwecke, z.B. eine Innen- oder Außenleuchte, welche LEDs als Leuchtmittel in wenigstens zwei verschiedenen Farben aufweist.The present invention relates to a luminaire for lighting purposes, e.g. an indoor or outdoor light, which has LEDs as lighting in at least two different colors.

Leuchten mit LED-Lichtquellen (light emitting diodes, worunter auch organic light emitting diodes zu verstehen sind) und einer transparenten Abdeckung aus einem optisch strukturierten oder diffus streuenden Flächenelement sind häufig so aufgebaut, dass das Licht der LEDs von hinten auf die Abdeckung auftrifft und entsprechend der optischen Eigenschaften der Abdeckung das Licht auf die Lichtaustrittsseite abgegeben wird.Luminaires with LED light sources ( light emitting diodes, which are also organic light emitting diodes to understand) and a transparent cover of an optically structured or diffusely scattering surface element are often constructed so that the light of the LEDs from the back hits the cover and accordingly the optical properties of the cover, the light is emitted to the light exit side.

Um zu verhindern, dass sich einzelne LED-Lichtquellen auf der transparenten Abdeckung sichtbar abzeichnen, müssen entsprechende Vorkehrungen getroffen werden. Dies kann z.B. durch eine diffus streuende Folie zwischen den LED-Lichtquellen und der optisch strukturierten Abdeckung erfolgen. Oder die Abdeckung kann selbst diffus streuend ausgebildet sein.In order to prevent that individual LED light sources visible on the transparent cover, appropriate precautions must be taken. This can e.g. done by a diffusing film between the LED light sources and the optically structured cover. Or the cover itself may be formed diffusely scattering.

Besondere Vorkehrungen müssen getroffen werden, wenn das Licht der LEDs aus mehreren Farben gemischt wird und die Farbunterschiede auf der Lichtaustrittsseite der Leuchte nicht sichtbar sein sollen. Ein Beispiel einer solchen Leuchte zum Mischen von Lichtfarben ist aus der DE 10 2012 213 046 A1 bekannt. Um das Licht aus warmweißen und tageslichtweißen LED-Elementen zu mischen, wird ein Leuchtenmodul vorgesehen, welches die LEDs auf zwei verschiedenen Platinen aufweist. Die Platinen werden so angeordnet, dass die LEDs der zwei verschiedenen Farben möglichst dicht aneinander liegen, um eine möglichst homogene Lichtdurchmischung zu erzeugen.Special precautions must be taken when the light of the LEDs is mixed in several colors and the color differences on the light exit side of the lamp should not be visible. An example of such a luminaire for mixing light colors is from DE 10 2012 213 046 A1 known. To mix the light of warm white and daylight white LED elements, a light module is provided, which has the LEDs on two different boards. The boards are arranged so that the LEDs of the two different colors are as close as possible to each other to produce the most homogeneous possible light mixing.

Im Unterschied zu Anzeigevorrichtungen aus LEDs, welche die vorliegende Erfindung nicht betreffen, ist es bei Leuchten wünschenswert, dass die Farbdurchmischung auf der vom Betrachter zu sehenden Lichtaustrittsseite keine Farbkonturen mehr erkennen lässt. Da das menschliche Auge Farbkonturen jedoch sehr sensitiv wahrnimmt, sind dazu entweder sehr enge Abstände der LEDs und/oder ein großer Abstand zwischen den LEDs und einen lichtstreuenden Element in der Lichtaustrittsöffnung einzuhalten.In contrast to display devices made of LEDs, which do not relate to the present invention, it is desirable for luminaires that the color mixing on the light exit side to be seen by the viewer no longer reveals color contours. However, since the human eye perceives color contours very sensitively, either very narrow spacings of the LEDs and / or a large distance between the LEDs and a light-scattering element in the light exit opening must be observed.

Aufgabe der vorliegenden Erfindung ist es, eine Leuchte mit LED-Lichtquellen in wenigstens zwei Farben zur Verfügung zu stellen, welche auf möglichst einfache Weise eine gute Durchmischung der Lichtfarben gewährleistet, wobei eine möglichst flache Bauform der Leuchte realisiert werden kann.Object of the present invention is to provide a luminaire with LED light sources in at least two colors available, which ensures the simplest possible way a good mixing of the light colors, with a flat as possible design of the lamp can be realized.

Gelöst wird die Aufgabe durch eine Leuchte für Beleuchtungszwecke mit einer Anordnung von LED-Lichtquellen, welche wenigstens zwei Gruppen von spektral unterschiedlich abstrahlenden LEDs aufweisen, wobei die LEDs jeder der Gruppen jeweils in einem regelmäßigen Gitter angeordnet sind und die wenigstens zwei Gitter ineinandergreifend in der Leuchte in einer Fläche angeordnet sind, wobei in einem Abstand zu besagter LED-Fläche ein Diffusorelement, insbesondere eine Diffusorscheibe oder eine Diffusorfolie, angeordnet ist, so dass das Licht der LEDs auf das Diffusorelement einfällt, wobei den LEDs jeweils einzeln ein Linsenkörper zugeordnet ist, welcher das von der LED abgegebene Licht derart aufweitet, dass die LEDs in jeweils eines Gitters in ihrer Gesamtheit das Diffusorelement mit einer homogenen Intensitätsverteilung bestrahlen, und die Intensitätsverteilungen der beiden Gitter von LEDs sich auf dem Diffusorelement überlagern.The object is achieved by a luminaire for lighting purposes with an array of LED light sources, which have at least two groups of spectrally different emitting LEDs, the LEDs of each of the groups are each arranged in a regular grid and the at least two grids intermeshing in the light are arranged in a surface, wherein at a distance from said LED surface, a diffuser element, in particular a diffuser plate or a diffuser film is arranged, so that the light of the LEDs incident on the diffuser element, wherein the LEDs each individually a lens body is associated, which the light emitted by the LED expands so that the LEDs in each case in a grid in their entirety irradiate the diffuser element with a homogeneous intensity distribution, and the intensity distributions of the two grids of LEDs are superimposed on the diffuser element.

Durch die Linsenkörper, die jeweils den LEDs einzeln zugeordnet sind, wird das Licht der LEDs aufgeweitet, noch bevor es auf das Diffusorelement auftrifft. Dadurch kann bei einem verhältnismäßig geringen Abstand zwischen dem Diffusorelement und der Fläche, in der die LEDs angeordnet sind, trotzdem eine homogene Intensitätsverteilung von jeder Gruppe der LEDs erzeugt werden, so dass sich das Licht der beiden Farben auf dem Diffusorelement derart mischt, dass Farbunterschiede vom menschlichen Auge nicht mehr wahrgenommen werden können. Unter einer homogenen Intensitätsverteilung ist in diesem Zusammenhang eine Intensitätsverteilung zu verstehen, bei der sich die Intensitäten der betreffenden Lichtfarbe auf dem Diffusorelement nicht mehr als ±10% zwischen den lichtstärksten und den lichtschwächsten Bereichen auf dem Diffusorelement vom Mittelwert unterscheiden, wobei Effekte nur im Randbereich des Diffusorelements unberücksichtigt bleiben.By the lens body, which are each assigned to the LEDs individually, the light of the LEDs is expanded even before it impinges on the diffuser element. Thus, at a relatively small distance between the diffuser element and the surface in which the LEDs are arranged, nevertheless a homogeneous intensity distribution of each group of LEDs are generated, so that mixes the light of the two colors on the diffuser element such that color differences from human eye can no longer be perceived. A homogeneous intensity distribution in this context means an intensity distribution in which the intensities of the relevant light color on the diffuser element do not differ from the mean value by more than ± 10% between the brightest and the lightest weakest regions on the diffuser element, effects only in the edge region of the diffuser element Disregard diffuser element.

Gemäß einer bevorzugten Ausführungsform hat jede LED des ersten Gitters als nächsten Nachbarn in der Fläche eine oder mehrere LEDs des zweiten Gitters. Insbesondere kann der Abstand zwischen einer LED des ersten Gitters zu allen nächsten Nachbarn im zweiten Gitters gleich groß gewählt werden. Durch die gleichen Abstände der Gitterpunkte zueinander ergibt sich eine gute Durchmischung des Lichts bereits durch die Anordnung der LEDs in der LED-Fläche. In Verbindung mit den Linsenkörpern kann dadurch selbst bei geringem Abstand zu dem Diffusorelemente eine homogene Durchmischung in der Fläche des Diffusorelements erzeugt werden.According to a preferred embodiment, each LED of the first grid has as its nearest neighbor in the area one or more LEDs of the second grid. In particular, the distance between an LED of the first grid to all nearest neighbors in the second grid can be selected to be the same size. By the same distances of the grid points to each other The result is a good mixing of the light already by the arrangement of the LEDs in the LED surface. In conjunction with the lens bodies, a homogeneous mixing in the surface of the diffuser element can thereby be produced even at a small distance from the diffuser elements.

Gemäß einer bevorzugten Ausführungsform sind die zwei LED-Gitter in einem Winkel zwischen 30° und 70°, insbesondere um 45° zueinander versetzt angeordnet. Beispielsweise können die LEDs innerhalb jeweils eines Gitters zueinander den gleichen Abstand aufweisen, z.B. in einem orthogonalen Gitter. Die beiden Gitter mit LEDs unterschiedlicher Farben können jeweils gleich ausgeführt sein. Durch eine Verschiebung der beiden Gitter um 45° ergibt sich insgesamt wieder ein z.B. orthogonales Gitter, in welchem abwechselnd die LEDs unterschiedlicher Farbe in den Spalten und Reihen angeordnet sind. Andere Konfigurationen können aber auch hexagonale Gitter umfassen, in denen ebenfalls jeweils eine LED der ersten Farbe nur LEDs als nächste Nachbarn aufweist, welche die zweite Farbe aufweisen.According to a preferred embodiment, the two LED grids are arranged at an angle between 30 ° and 70 °, in particular offset by 45 ° to each other. For example, within each grid, the LEDs may be the same distance apart, e.g. in an orthogonal grid. The two grids with LEDs of different colors can each be made the same. As a result of a displacement of the two gratings by 45.degree. orthogonal grid in which the LEDs of different colors are alternately arranged in the columns and rows. However, other configurations may also include hexagonal grids, in which also each one LED of the first color only has LEDs as nearest neighbors, which have the second color.

Gemäß einer bevorzugten Ausführungsform sind die LEDs beider Gitter auf einer unterschiedlichen Platine angeordnet. Diese Ausführungsform hat den Vorteil, dass die LEDs jeweils einer Farbe leicht über eine gemeinsame Platine kontaktiert werden können, um die LEDs der beiden Farben getrennt voneinander ansteuern zu können. Jedes der zwei Gitter kann auch mehrere Platinen umfassen. Die Platinen der beiden Gitter werden vorzugsweise ineinandergreifend angeordnet. Beispielsweise können die Platinen kammförmig ineinandergreifen. Andere Konfigurationen sehen sägezahnförmige oder schlangenförmige Linien als Platinen vor, die jeweils ineinandergreifend angeordnet sind. Auf jeder Linie einer schlangenförmigen und/oder sägezahnförmigen Platine sind jeweils LEDs in nur einer Farbe angeordnet, so dass bei ineinandergreifenden Platinen vorzugsweise die nächsten Nachbarn einer LED wieder durch LEDs der jeweils anderen Farbe gebildet werden.According to a preferred embodiment, the LEDs of both grids are arranged on a different board. This embodiment has the advantage that the LEDs of each color can be easily contacted via a common board in order to be able to control the LEDs of the two colors separately from one another. Each of the two grids may also include multiple boards. The blanks of the two grids are preferably arranged intermeshing. For example, the boards can mesh comb-shaped. Other configurations provide sawtooth or serpentine lines as sinkers, each interdigitated. On each line of a serpentine and / or sawtooth-shaped circuit board LEDs are arranged in one color only, so that in interlocking boards preferably the nearest neighbors of an LED are again formed by LEDs of the other color.

Gemäß einer Ausführungsform erzeugen die Linsenkörper jeweils eine Lichtverteilung der LED in einer Schnittebene, in welcher die optische Achse der LED liegt (in der Lichttechnik auch als C-Ebene bezeichnet), die zwei symmetrische Maxima in einem Winkelbereich von ±40° bis ±80°, bevorzugt zwischen ±50° und ±70°, jeweils von der optischen Achse aus gemessen, aufweisen. Eine solche Lichtverteilung, die auch als Batwing-Verteilung bezeichnet wird, gewährleistet eine gute Durchmischung des Lichts benachbarter LEDs, weil die Lichtverteilung verhältnismäßig breit ist. Dadurch überlagert sich das Licht benachbarter LEDs bereits innerhalb eines vergleichsweise kurzen Abstands zu der LED-Fläche, so dass bei einem Auftreffen des Lichts auf das Diffusorelement bereits eine homogene Durchmischung des Lichts erfolgt ist.According to one embodiment, the lens bodies each generate a light distribution of the LED in a sectional plane in which the optical axis of the LED is located (also referred to as C-plane in the lighting art), the two symmetrical maxima in an angular range of ± 40 ° to ± 80 ° , preferably between ± 50 ° and ± 70 °, each measured from the optical axis. Such a light distribution, which is also referred to as batwing distribution ensures good mixing of the light of adjacent LEDs, because the light distribution is relatively wide. As a result, the light of adjacent LEDs superimposed already within a comparatively short distance to the LED surface, so that a homogeneous mixing of the light has already taken place when the light strikes the diffuser element.

Gemäß einer bevorzugten Ausführungsform erzeugen die Linsenkörper jeweils eine rotationssymmetrische Lichtverteilung. In dieser Ausführungsform können die symmetrischen Maxima, welche in einer Schnittebene gemäß der vorhergehend beschriebenen Ausführungsform beschrieben wurden, ein umlaufendes Maximum bilden.According to a preferred embodiment, the lens bodies each generate a rotationally symmetrical light distribution. In this embodiment, the symmetrical maxima, which have been described in a sectional plane according to the previously described embodiment, can form a circulating maximum.

Gemäß einer weiteren bevorzugten Ausführungsform sind die Linsenkörper als FreiformLinsen ausgeführt, welche in den Hauptebenen C0-C180 und C90-C270 eine erste Lichtverteilung und in den Hauptebenen C45-C225 und C135-C315 eine zweite von der ersten verschiedenen Lichtverteilung erzeugen, wobei insbesondere die zweite Lichtverteilung breiter als die erste Lichtverteilung ist. Die Hauptebenen C0-C180 und C90-C270 sind zwei C-Ebenen (d.h. Schnittebenen, welche die optische Achse der LED enthalten und senkrecht zur der LED-Fläche angeordnet sind) definiert, welche einen Winkel von 90° einnehmen. Die weiteren Hauptebenen C45-C225 und C135-C315 sind dementsprechend durch zwei Schnittebenen definiert, die zu den vorher genannten Ebenen in einem Winkel von 45° gedreht sind. Die Nomenklatur "Cx" bezeichnet die in der Lichttechnik üblicherweise verwendeten C-Ebenen, wobei x den Azimuthalwinkel bezeichnet. Diese Ausführungsform hat den Vorteil, dass z.B. bei einem orthogonalen Gitter von LEDs die Lichtverteilung über das Diffusorelement, welche bereits von jeder einzelnen LED ausgeht, gleichmäßiger ist, weil eine breitere Lichtverteilung in der Ebene diagonal zwischen den LEDs in den beiden Gittern erfolgt, während eine schmälere Lichtverteilung in der Richtung zu der nächst benachbarten LED erfolgt. Durch die unterschiedliche Lichtverteilungen wird das Missverhältnis der Intensitäten ausgeglichen, welches dadurch entsteht, dass die LEDs einer ersten Farbe zur nächstbenachbarten LED, welche die zweite unterschiedliche Farbe aufweist, einen kürzeren Abstand aufweist als zu der übernächsten LED, welche wieder eine LED der ersten Farbe ist. Für ein orthogonales Gitter aus zwei LED-Farben lässt sich mit diesen Freiform-Linsen daher eine homogene Intensitätsverteilung über das Diffusorelement für jede Lichtfarbe erzeugen, selbst wenn man berücksichtigt, dass die LEDs noch in einem verhältnismäßig großem Abstand zueinander angeordnet sind und das Diffusorelement verhältnismäßig nah zu den LEDs angeordnet ist. Gemäß einer bevorzugten Ausführungsform erzeugen die Linsenkörper des ersten LED-Gitters eine Lichtverteilung in einer Schnittebene, welche jeweils die optische Achse der LED enthält, mit zwei Maxima in symmetrischen Winkelbereichen und die Linsenkörper des zweiten LED-Gitters erzeugen jeweils in einer Schnittebene, welche die optische Achse der LEDs enthält, eine Lichtverteilung mit zwei Maxima in einem symmetrischen Winkelbereichen, und die LEDs beider Gitter sind in einem solchen Abstand angeordnet, und das Diffusorelement ist gegenüber der Fläche der LEDs ist in einem solchen Abstand angeordnet, dass sich die Richtungsstrahlen von zwei Maxima benachbarter LEDs in den Schnittebenen überschneiden, bevor das Licht auf das Diffusorelement auftrifft. Durch diese Anordnung ist gewährleistet, dass sich das Licht benachbarter LEDs unterschiedlicher Farbe bereits durchmischt, bevor das Licht auf das Diffusorelement auftrifft. Dadurch lässt sich eine sehr homogene Lichtverteilung auf dem Diffusorelement erzielen. Der Fachmann wird dabei verstehen, dass der Abstand der LEDs zueinander, die Breite der Leichtverteilungen, d.h. der Winkelbereich, in welchem die Maxima erzeugt werden, und der Abstand der LED-Fläche zu dem Diffusorelement miteinander in Wechselwirkung stehen, um eine homogene Lichtdurchmischung zu erzielen. Bei einer breiteren Lichtverteilung kann beispielsweise der Abstand der LEDs zueinander größer sein und der Abstand des Diffusorelements zu der LED-Fläche geringer sein. Bei einem weiteren Abstand des Diffusorelements von der LED-Fläche kann der Abstand der LEDs zueinander größer gewählt werden oder ggf. die Lichtverteilung, welche von den Linsenkörpern erzeugt wird, auch schmäler gewählt werden.According to a further preferred embodiment, the lens bodies are designed as free-form lenses which produce a first light distribution in the main planes C0-C180 and C90-C270 and a second light distribution different from the first in the main planes C45-C225 and C135-C315, wherein in particular the second Light distribution is wider than the first light distribution. The main planes C0-C180 and C90-C270 are two C-planes (ie, cut planes containing the optical axis of the LED and arranged perpendicular to the LED surface) which are at an angle of 90 °. The other main planes C45-C225 and C135-C315 are accordingly defined by two cutting planes which are turned at an angle of 45 ° to the aforementioned planes. The nomenclature "Cx" denotes the C-planes commonly used in lighting technology, where x denotes the azimuthal angle. This embodiment has the advantage that, for example, in an orthogonal grid of LEDs, the light distribution over the diffuser element, which already emanates from each individual LED, is more uniform, because a broader light distribution in the plane takes place diagonally between the LEDs in the two grids, while a narrower light distribution in the direction of the next adjacent LED is done. Due to the different light distributions the mismatch of the intensities is compensated, which arises because the LEDs of a first color to the next adjacent LED, which has the second different color, a shorter distance than the next but one LED, which is again an LED of the first color , For an orthogonal grid of two LED colors, therefore, these free-form lenses can produce a homogeneous intensity distribution across the diffuser element for each light color, even considering that the LEDs are still spaced a relatively large distance apart and the diffuser element is relatively close is arranged to the LEDs. According to a preferred embodiment, the lens bodies of the first LED grid generate a light distribution in a sectional plane, which in each case contains the optical axis of the LED, with two maxima in symmetrical angular ranges and the lens bodies of the second LED grid each generate in a sectional plane which the optical Axis of the LEDs, a light distribution with two maxima in a symmetrical angle ranges, and the LEDs of both grids are arranged at such a distance, and the diffuser element is opposite the surface of the LEDs is arranged at such a distance that the directional beams of two maxima overlap adjacent LEDs in the cutting planes before the light impinges on the diffuser element. This arrangement ensures that the light of adjacent LEDs of different colors already mixes before the light impinges on the diffuser element. This makes it possible to achieve a very homogeneous light distribution on the diffuser element. The person skilled in the art will understand that the distance of the LEDs from one another, the width of the light distributions, ie the angular range in which the maxima are generated, and the distance between the LED surface and the diffuser element interact with one another in order to achieve homogeneous light mixing , In the case of a broader light distribution, for example, the distance of the LEDs from one another may be greater and the distance between the diffuser element and the LED surface may be smaller. With a further distance of the diffuser element from the LED surface, the distance of the LEDs from one another can be selected to be larger or, if necessary, the light distribution which is generated by the lens bodies can also be selected to be narrower.

Gemäß einer bevorzugten Ausführungsform ist auf der den LEDs abgewandten Seite des Diffusorelements ein optisch strukturiertes, transparentes Element angeordnet. Beispielsweise kann eine Prismenplatte oder eine mit linsenförmigen Erhebungen versehene Scheibe gegenüber dem Diffusorelement angeordnet sein. Dieses optisch strukturierte, transparente Element kann durch Lichtbrechung gewünschte Effekte erzeugen, insbesondere zur Entblendung der Leuchte dienen. Es ist dabei zu verstehen, dass die Lichtdurchmischung bereits weitgehend in dem Diffusorelement erfolgt, während das optisch strukturierte, transparente Element der Lichtlenkung des bereits durchmischten Lichts dient.According to a preferred embodiment, an optically structured, transparent element is arranged on the side of the diffuser element facing away from the LEDs. By way of example, a prism plate or a disk provided with lenticular elevations can be arranged opposite the diffuser element. This optically structured, transparent element can produce desired effects by refraction of light, in particular serve to glare the lamp. It should be understood that the mixing of the light already largely takes place in the diffuser element, while the optically structured, transparent element serves to direct the light of the already mixed-in light.

Der Abstand zwischen dem Diffusorelement und dem optisch strukturierten, transparenten Element kann zwischen 1 µm und 0,5 µm gemäß einer Ausführungsform betragen. Der Abstand zwischen dem Diffusorelement und dem optisch strukturierten, transparenten Element, welche vorzugsweise in Form eines Luftspalts ausgebildet ist, ist vorteilhaft, um die Eigenschaften der Lichtlenkung durch das optisch strukturiertes, transparente Element zu verbessern. Wäre das optisch strukturierte transparente Element direkt mit dem Diffusorelement verbunden, könnte u. U. die Lichtbrechung beim Eintritt des Lichts in das optisch strukturierte, transparente Element nicht ausreichen, um die gewünschte Lichtlenkung zu erzielen. Bei einem Luftspalt ist gewährleistet, dass bei dem Eintritt des Lichts in das optisch strukturierte, transparente Element ein optischer Übergang vom optisch dünneren zu einem optisch dichteren Medium mit der entsprechenden Lichtbrechung erfolgt.The distance between the diffuser element and the optically structured, transparent element can be between 1 μm and 0.5 μm, according to one embodiment. The distance between the diffuser element and the optically structured, transparent element, which is preferably designed in the form of an air gap, is advantageous for the properties the light control through the optically structured, transparent element to improve. If the optically structured transparent element were connected directly to the diffuser element, u. U. the refraction of light when entering the light in the optically structured, transparent element is not sufficient to achieve the desired light control. In the case of an air gap, it is ensured that, when the light enters the optically structured, transparent element, there is an optical transition from the optically thinner to an optically denser medium with the corresponding refraction of light.

Gemäß einer Alternative kann der Abstand zwischen dem Diffusorelement und dem optisch strukturierten, transparenten Element auch vergrößert werden. Beispielsweise kann ein Luftspalt zwischen 15 mm bis 30 mm vorgesehen sein. Diese Anordnung hat den Vorteil, dass sich die Lichtdurchmischung nach dem Austritt aus dem Diffusorelement und vor dem Eintritt in das optisch strukturiertes, transparente Element noch verbessert. In einer abstandsoptimierten Ausführungsform beträgt der Abstand (Luftspalt) zwischen dem Diffusorelement und dem optisch strukturierten, transparenten Element zwischen 0,5 mm und 20 mm.According to an alternative, the distance between the diffuser element and the optically structured, transparent element can also be increased. For example, an air gap between 15 mm to 30 mm may be provided. This arrangement has the advantage that the light mixing after exiting the diffuser element and before entering the optically structured, transparent element even better. In a distance-optimized embodiment, the distance (air gap) between the diffuser element and the optically structured, transparent element is between 0.5 mm and 20 mm.

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden aus der nachfolgenden Beschreibung mehrerer bevorzugten Ausführungsformen deutlich, die in Verbindung mit den beigefügten Figuren gegeben wird. In den Figuren ist Folgendes dargestellt:

Figur 1
zeigt einen vertikalen Schnitt durch eine erste Ausführungsform der erfindungsgemäßen Leuchte.
Figur 2
zeigt eine Aufsicht auf die Fläche der LEDs einer Leuchte gemäß Figur 1 ohne Diffusorelement.
Figur 3
zeigt in einem Polardiagramm eine Lichtverteilungskurve einer LED mit Linsenkörper, wobei in der Tabelle die Lichtstärke für ausgewählte Winkel in Absolutwerten und prozentualen Werten bezogen auf das Maximum bei 100% angegeben sind.
Figur 4
zeigt schematisch eine Aufsicht auf die LED-Fläche einer Ausführungsform der erfindungsgemäßen Leuchte, wobei die elektrische Kontaktierung der LEDs schematische dargestellt ist.
Figur 5
zeigt eine schematische Aufsicht auf die Fläche der LEDs einer Ausführungsform der erfindungsgemäßen Leuchte, wobei die Platinen dargestellt sind, auf denen LEDs kontaktiert sind.
Figur 6
zeigt eine Abbildung entsprechend der Figur 5 für eine weitere Ausführungsform.
Figur 7
zeigt einen vertikalen Schnitt durch eine weitere Ausführungsform der Leuchte gemäß der Erfindung mit einem optisch strukturierten Element auf der Lichtaustrittsseite.
Figur 8
zeigt eine weitere Ausführungsform der vorliegenden Erfindung vergleichbar zur Figur 7, jedoch mit vergrößertem Abstand zwischen dem Diffusorelement und dem optisch strukturierten, transparenten Element.
Other features and advantages of the present invention will become apparent from the following description of several preferred embodiments, taken in conjunction with the accompanying drawings. The figures show the following:
FIG. 1
shows a vertical section through a first embodiment of the lamp according to the invention.
FIG. 2
shows a plan view of the surface of the LEDs of a lamp according to FIG. 1 without diffuser element.
FIG. 3
shows in a polar diagram a light distribution curve of an LED with lens body, in the table, the luminous intensity for selected angles in absolute values and percentage values relative to the maximum at 100% are given.
FIG. 4
schematically shows a plan view of the LED surface of an embodiment of the lamp according to the invention, wherein the electrical contact of the LEDs is shown schematically.
FIG. 5
shows a schematic plan view of the surface of the LEDs of an embodiment of the lamp according to the invention, wherein the circuit boards are shown, on which LEDs are contacted.
FIG. 6
shows an illustration corresponding to the FIG. 5 for another embodiment.
FIG. 7
shows a vertical section through a further embodiment of the luminaire according to the invention with an optically structured element on the light exit side.
FIG. 8
shows a further embodiment of the present invention comparable to FIG. 7 but with increased distance between the diffuser element and the optically structured, transparent element.

Bezug nehmend auf die Figuren 1 und 2 wird eine erste Ausführungsform einer Leuchte gemäß der Erfindung erläutert. Die Leuchte weist ein etwa quadratisches Gehäuse auf, von den eine Schnittdarstellung nach Figur 1 nur ein Ausschnitt der Bodenseite 2 zu sehen ist. Auf dem Boden sind eine Anzahl von LEDs 4 und 6 auf einer Platine (nicht dargestellt) angebracht. Wie in der Aufsicht auf Figur 2 zu sehen ist, bilden die LEDs 4 und 6 jeweils ein orthogonales Gitter, wobei die Gitter mit einem Winkel von 45° versetzt zueinander angeordnet sind. Die LEDs 4 und 6 geben Licht mit unterschiedlicher Spektralfarbe ab. Die Leuchte ist so ausgestaltet, dass die Lichtfarben der LEDs so gut gemischt werden, dass der Betrachter von außen den Farbunterschied zwischen den LEDs auf einem Diffusorelement nicht wahrnehmen kann.Referring to the Figures 1 and 2 A first embodiment of a luminaire according to the invention will be explained. The lamp has an approximately square housing, of which a sectional view FIG. 1 only a section of the bottom side 2 can be seen. On the ground, a number of LEDs 4 and 6 are mounted on a board (not shown). As in the supervision FIG. 2 can be seen, the LEDs 4 and 6 each form an orthogonal grid, wherein the gratings are arranged at an angle of 45 ° to each other. LEDs 4 and 6 emit light of different spectral color. The luminaire is designed so that the light colors of the LEDs are mixed so well that the observer can not perceive the color difference between the LEDs on a diffuser element from the outside.

In einem Abstand h zwischen der Bodenplatte 2, auf der den LEDs gegenüberliegenden Seite ist das Diffusorelement 8 angeordnet, welches in der gezeigten Ausführungsform als eine Streuscheibe ausgebildet ist. Die Streuscheibe 8 weist mattierte Oberflächen auf, so dass das Licht, welches durch die Streuscheibe 8 hindurchtritt, gleichmäßig verteilt wird.At a distance h between the bottom plate 2, on the opposite side of the LEDs, the diffuser element 8 is arranged, which is formed in the embodiment shown as a lens. The diffuser 8 has frosted surfaces, so that the light passing through the diffuser 8 is evenly distributed.

Wie in der Schnittzeichnung nach Figur 1 zu sehen ist, ist über jeder LED 4 bzw. 6 ein Linsenelement 10 angeordnet. Das Linsenelement 10 beeinflusst die Lichtverteilung jeder einzelnen LED. In der Figur 1 sind die Lichtverteilungen der LEDs schematisch durch gestrichelte Linien dargestellt. Es ist zu sehen, dass entgegen der normalen Strahlcharakteristik einer LED, nämlich als ein Lambert-Strahler, die Lichtverteilung in dem dargestellten Schnitt breiter ist und zwei symmetrische Maxima aufweist.As in the sectional drawing FIG. 1 can be seen, a lens element 10 is arranged above each LED 4 and 6, respectively. The lens element 10 influences the light distribution of each individual LED. In the FIG. 1 the light distributions of the LEDs are shown schematically by dashed lines. It can be seen that, contrary to the normal beam characteristic of an LED, namely as a Lambert radiator, the light distribution in the illustrated section is wider and has two symmetrical maxima.

Bezug nehmend auf Figur 3 ist die Lichtverteilung einer LED in der C0-C180-Ebene der Leuchte dargestellt. Die Lichtverteilung weist zwei symmetrische Maxima bei ± 63° auf.Referring to FIG. 3 the light distribution of an LED is shown in the C0-C180 plane of the luminaire. The light distribution has two symmetrical maxima at ± 63 °.

Gemäß der Ausführungsform der Figuren 1 und 2 sind die Linsenkörper 10 rotationssymmetrisch ausgebildet. Die Linie, auf denen die Maxima der Lichtverteilung etwa in Höhe des Diffusorelement liegen, sind in der Figur 2 als gestrichelte Kreise dargestellt.According to the embodiment of the Figures 1 and 2 the lens body 10 are rotationally symmetrical. The line on which the maxima of the light distribution are approximately at the level of the diffuser element, are in the FIG. 2 shown as dashed circles.

Wie insbesondere aus den Figuren 1 und 2 ersichtlich ist, findet eine vollkommene Durchmischung des Lichts in dem Abstand h gegenüber der LED-Ebene 2, welches der Bodenfläche des Gehäuses entspricht, statt, so dass das Licht, welches auf das Diffusorelement 8 auftrifft, bereits homogen verteilt ist. Unter einer homogenen Intensitätsverteilung ist eine Verteilung zu verstehen, deren Intensitätsmaxima und Intensitätsminima nicht mehr als ±10% schwankt. Durch die breite Aufweitung der Lichtverteilung jeder einzelnen LED kann die Durchmischung des Lichts innerhalb des Abstands h erreicht werden. Im Vergleich zu einer Leuchte ohne Linsenkörper, welche keine Aufweitung der Lichtverteilung enthält, kann daher das Diffusorelement 8 in einem wesentlich näheren Abstand h zu den Leuchten angebracht werden. Ohne die Linsenelemente 10 müsste das Diffusorelement in einem wesentlich größeren Abstand h zu den LEDs angebracht werden, um eine homogene Intensitätsverteilung zu erzeugen, weil das emittierte Licht zur Durchmischung eine größere Wegstrecke benötigen würde.As in particular from the Figures 1 and 2 it can be seen, there is a complete mixing of the light at the distance h with respect to the LED plane 2, which corresponds to the bottom surface of the housing, instead, so that the light impinging on the diffuser element 8 is already homogeneously distributed. A homogeneous intensity distribution is to be understood as a distribution whose intensity maxima and intensity minima do not fluctuate more than ± 10%. Due to the wide expansion of the light distribution of each individual LED, the mixing of the light within the distance h can be achieved. Compared to a lamp without lens body, which contains no expansion of the light distribution, therefore, the diffuser element 8 can be mounted at a much closer distance h to the lights. Without the lens elements 10, the diffuser element would have to be attached to the LEDs at a much greater distance h to produce a homogeneous intensity distribution because the emitted light would require a longer distance for mixing.

Wie in der Figur 2 dargestellt ist, sind die LEDs in der Ebene 2 jeweils in einem orthogonalen Gitter angeordnet, wobei die beiden Gitter ineinander liegen. Der Abstand zum jeweils nächsten Nachbarn entlang der orthogonalen Hauptachsen a bzw. b sind gleich groß. Die Gitter sind demnach um 45° zueinander versetzt. Dies entspricht einer bevorzugten Ausführungsform. Es können jedoch auch beispielsweise hexagonale Strukturen verwendet werden. Auch bei diesen Gittern ist es möglich, dass der jeweils nächste Nachbar jeder LED eine spektral unterschiedlich abstrahlenden LED bildet, während der übernächste Nachbar wieder eine spektral gleichabstrahlende LED bildet.Like in the FIG. 2 is shown, the LEDs in the plane 2 are each arranged in an orthogonal grid, wherein the two gratings are in one another. The distance to the next neighbor along the orthogonal main axes a and b are the same size. The grids are therefore offset by 45 ° to each other. This corresponds to a preferred embodiment. However, hexagonal structures, for example, may also be used. Even with these grids, it is possible that the next neighbor of each LED forms a spectrally different emitting LED, while the neighbor next neighbor again forms a spectrally gleichabstrahlende LED.

In der Ausführungsform nach Figuren 1 und 2 erzeugen die Linsenelemente eine rotationsymmetrische Lichtverteilung um die optische Achse der LED. Gemäß einer alternativen Ausführungsform (in den Figuren nicht dargestellt) kann jedoch auch eine davon abweichende Lichtverteilung erzeugt werden. Bei dem orthogonalen Gitter dieser Ausführungsform ist z.B. eine Lichtverteilung bevorzugt, die in den Achsen diagonal zu den Hauptachsen des orthogonalen Gitters breiter strahlend ist als parallel zu den Hauptachsen des orthogonalen Gitters. In der Darstellung gemäß Figur 2 würde das bedeuten, dass die gestrichelten Kreise näherungsweise ein Quadrat bilden. Dadurch kann die Homogenität der Intensitätsverteilung auf dem Diffusorelement bei gegebenem Gitterabstand a bzw. b und bei gegebenen Abstand h noch weiter verbessert werden. Die Linsenkörper dieser Ausführungsform erzeugen dazu eine breitere Lichtverteilung in den Hauptebenen C45-C225 und C135-C315 als in den Hauptebenen C0-C180 und C90-C270.In the embodiment according to Figures 1 and 2 The lens elements generate a rotationally symmetric light distribution about the optical axis of the LED. According to an alternative embodiment (not shown in the figures), however, a deviating light distribution can be generated. In the orthogonal grating of this embodiment, for example, a light distribution which is wider in the axes diagonal to the main axes of the orthogonal grating than that parallel to the main axes of the orthogonal grating is preferable. In the illustration according to FIG. 2 that would mean that the dashed circles are approximately one square. As a result, the homogeneity of the intensity distribution on the diffuser element can be further improved for a given grating spacing a or b and for a given distance h. For this purpose, the lens bodies of this embodiment produce a broader light distribution in the main planes C45-C225 and C135-C315 than in the main planes C0-C180 and C90-C270.

Zur Realisierung der zwei ineinander geschobenen orthogonalen Gitter von LEDs unterschiedlicher Farbe kann eine Schaltungsanordnung, wie in Figur 4 dargestellt, gemäß einer Ausführungsform der Erfindung gewählt werden.For the realization of the two telescoped orthogonal gratings of LEDs of different colors, a circuit arrangement as in FIG. 4 shown selected according to an embodiment of the invention.

Wie in der Figur 4 dargestellt ist, sind jeweils mehrere LEDs der gleichen Farbe in einer Schaltung kammförmig angeordnet und mit einer gleichen Anordnung von LEDs der anderen spektralen Farbe ineinander geschoben. Beispielsweise können die LEDs 4 bzw. 6 jeweils auf einer eigenen Platine angeordnet sein, die kammförmig ineinander greifen. Diese Art der elektrischen Kontaktierung hat den Vorteil, dass die LEDs der beiden Farben unterschiedlich von einander angesteuert werden können. Durch unterschiedliches Dimmen der beiden LED-Gitter lassen sich daher unterschiedliche Mischfarben mit der Leuchte erzeugen. Da jede Gruppe von LEDs bereits eine etwa homogene Lichtverteilung auf dem Diffusorelement 8 erzeugt, ist auch jede Mischfarbe auf dem Diffusorelement homogen verteilt, so dass der Betrachter immer eine Leuchte in einheitlicher Farbe wahrnimmt.Like in the FIG. 4 is shown, a plurality of LEDs of the same color are arranged comb-shaped in a circuit and pushed together with a same arrangement of LEDs of the other spectral color. For example, the LEDs 4 and 6 may each be arranged on a separate board, which mesh with each other like a comb. This type of electrical contacting has the advantage that the LEDs of the two colors can be controlled differently from each other. By different dimming of the two LED grid can therefore produce different mixed colors with the lamp. Since each group of LEDs already produces an approximately homogeneous light distribution on the diffuser element 8, each mixed color is distributed homogeneously on the diffuser element, so that the viewer always perceives a lamp in a uniform color.

Alternative Ausführungsformen zur Anordnung der Platinen für zwei orthogonale Gitter sind in den Figuren 5 und 6 dargestellt. Gemäß Figur 5 sind LEDs jeweils einer Lichtfarbe auf sägezahnförmig angeordneten Platinenstreifen angeordnet. Durch Aneinanderfügen der sägezahnförmige Platinenstreifen ergibt sich insgesamt eine LED-Anordnung, die den orthogonalen Gittern, wie in Zusammenhang mit der Figur 2 beschrieben, entspricht. Gemäß der Ausführungsform nach Figur 6 sind die Platinen als diagonale Streifen ausgebildet, wobei auch bei dieser Ausführungsform jeder Platinenstreifen nur eine Gruppe von LEDs jeweils gleicher spektraler Lichtabstrahlen umfasst.Alternative embodiments for arranging the boards for two orthogonal gratings are disclosed in US Pat FIGS. 5 and 6 shown. According to FIG. 5 LEDs are each arranged a light color on sawtooth-shaped circuit board strips. By joining the sawtooth-shaped board strips results in an overall LED arrangement, the orthogonal gratings, as in connection with the FIG. 2 described, corresponds. According to the embodiment according to FIG. 6 the boards are formed as diagonal stripes, and also In this embodiment, each board strip comprises only one group of LEDs each having the same spectral light emission.

Die Schnittzeichnung gemäß Figur 7, welche eine weitere Ausführungsform der Erfindung darstellt, entspricht der Abbildung in Figur 1. Zusätzlich ist jedoch ein optisch strukturiertes, transparentes Element 12 auf der den LEDs abgewandten Seite des Diffusorelements 8 vorgesehen.The sectional drawing according to FIG. 7 , which represents a further embodiment of the invention, corresponds to the illustration in FIG FIG. 1 , In addition, however, an optically structured, transparent element 12 is provided on the side of the diffuser element 8 facing away from the LEDs.

Das optisch strukturierte, transparente Element 12 weist auf der Lichtaustrittsseite eine Prismenstruktur auf, die in der Figur 7 in der Schnittzeichnung in der Richtung senkrecht zur Längserstreckung der Prismen zu sehen ist. Diese Prismen sorgen durch Lichtbrechung für eine Entblendung der Leuchte, weil das diffus abgegebene Licht des Diffusorelements durch Lichtbrechung an den Prismen umgelenkt wird. Bevorzugt ist eine Lichtabstrahlung mit einer Abschirmung oberhalb eines Grenzwinkels, z.B. zwischen 50° und 70° gegenüber der Flächennormalen der Lichtaustrittsfläche.The optically structured, transparent element 12 has a prism structure on the light exit side, which in the FIG. 7 in the sectional drawing in the direction perpendicular to the longitudinal extent of the prisms can be seen. These prisms ensure refraction of the light due to refraction of light, because the diffusely emitted light of the diffuser element is deflected by refraction of light to the prisms. Preference is given to a light emission with a shield above a critical angle, for example between 50 ° and 70 ° with respect to the surface normal of the light exit surface.

Das optisch strukturierte, transparente Element gemäß einer anderen Ausführungsform kann anstelle von Prismen auch linsenförmige Erhebungen aufweisen. Ferner sind auch Kegel oder Prismen oder Kegel- oder Prismenstümpfe möglich, um z.B. eine Abschirmung in zwei orthogonalen Richtungen zu erzeugen.The optically structured, transparent element according to another embodiment may also have lenticular elevations instead of prisms. Furthermore, cones or prisms or truncated cones or prisms are also possible, e.g. to create a shield in two orthogonal directions.

Das optisch strukturierte, transparente Element 12 der Figur 7 ist einem Abstand c zu dem Diffusorelement 8 angeordnet. Dieser Abstand, der in Form eines Luftspalts gebildet ist, ist bevorzugt, damit das Licht, welches in das optisch strukturierte, transparente Element eintritt, bereits eine Lichtbrechung von einem optisch dünneren zu einem optisch dichteren Medium erfährt. Wäre das optisch strukturierte, transparente Element 12 direkt angrenzend an das Diffusorelement 8 angebracht, wäre die Wirksamkeit dieses Elements 12 verringert, weil die Lichtbrechung an der Grenzfläche zwischen Luft und dem Material des transparenten Elements 12 entfällt.The optically structured, transparent element 12 of FIG FIG. 7 is arranged at a distance c from the diffuser element 8. This distance, which is formed in the form of an air gap, is preferred so that the light which enters the optically structured, transparent element already undergoes a refraction of light from an optically thinner to an optically denser medium. If the optically structured, transparent element 12 were mounted directly adjacent to the diffuser element 8, the effectiveness of this element 12 would be reduced because the refraction of light at the interface between air and the material of the transparent element 12 is eliminated.

Figur 8 zeigt eine weitere Variante der Ausführungsform nach Figur 7, wobei bei dieser Ausführungsform der Abstand d zwischen dem Diffusorelement 8 und dem optisch strukturierten, transparenten Element 12 vergrößert ist. Diese Ausführungsform hat den Vorteil, dass im Bereich zwischen dem Diffusorelement 8 und dem optisch strukturierten, transparenten Element 12 eine größere Wegstrecke verbleibt, in der eine weitere Lichtdurchmischung stattfinden kann. Gemäß Ausführungsformen der Erfindung ist eine abstandsoptimierte Anordnung zwischen dem Diffusorelement 8 und dem optisch strukturierten, transparenten Element 12 ein Luftspalt zwischen 0,5 mm bis 20 mm gebildet. FIG. 8 shows a further variant of the embodiment according to FIG. 7 In this embodiment, the distance d between the diffuser element 8 and the optically structured, transparent element 12 is increased. This embodiment has the advantage that in the region between the diffuser element 8 and the optically structured, transparent element 12 remains a greater distance in which a further light mixing can take place. According to embodiments of the invention, a distance-optimized arrangement between the diffuser element 8 and the optically structured, transparent element 12, an air gap between 0.5 mm to 20 mm is formed.

Zahlreiche Änderungen können an den vorhergehend dargestellten bevorzugten Ausführungsformen vorgenommen werden, ohne von dem Gegenstad der Erfindung, wie er durch die Ansprüche definiert ist, abzuweichen. Insbesondere ist die Erfindung nicht auf orthogonale Gitter beschränkt, sondern andere regelmäßige Gittertypen können vorgesehen sein (insbesondere hexagonal). Ferner ist die Erfindung auch nicht auf zwei Gruppen unterschiedlich spektral abstrahlender LEDs beschränkt. Gemäß einer alternativen Ausführungsform können auch drei oder mehr Gruppen unterschiedlich spektral abstrahlender LEDs angewandte werden.Numerous changes may be made to the preferred embodiments presented above without departing from the scope of the invention as defined by the claims. In particular, the invention is not limited to orthogonal gratings, but other regular grating types may be provided (especially hexagonal). Furthermore, the invention is not limited to two groups of different spectrally radiating LEDs. According to an alternative embodiment, three or more groups of different spectrally emitting LEDs may also be used.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

22
LED-Ebene bzw. Bodenfläche des GehäusesLED level or bottom surface of the housing
44
LED mit erster FarbeLED with first color
66
LED mit zweiter FarbeLED with second color
88th
Diffusorelementdiffuser element
1010
Linsenkörperlens body
1212
Strukturiertes, transparentes ElementStructured, transparent element

Claims (15)

Leuchte für Beleuchtungszwecke mit einer Anordnung von LED-Lichtquellen, welche wenigstens zwei Gruppen von spektral unterschiedlich abstrahlenden LEDs (4, 6) aufweisen,
wobei die LEDs (4, 6) jeder der Gruppen jeweils in einem regelmäßigen Gitter angeordnet sind und die wenigstens zwei Gitter ineinandergreifend in der Leuchte in einer Fläche (2) angeordnet sind,
wobei in einem Abstand zu besagter LED-Fläche (2) ein Diffusorelement (8), insbesondere eine Diffusorscheibe oder eine Diffusorfolie, angeordnet ist, so dass das Licht der LEDs (4, 6) auf das Diffusorelement einfällt,
wobei den LEDs (4, 6) jeweils einzeln ein Linsenkörper (10) zugeordnet ist, welcher das von der LED abgegebene Licht derart aufweitet, dass die LEDs jeweils eines Gitters in ihrer Gesamtheit das Diffusorelement mit einer homogenen Intensitätsverteilung bestrahlen, und die Intensitätsverteilungen der beiden Gitter von LEDs sich auf dem Diffusorelement überlagern.Luminaire for lighting purposes with an arrangement of LED light sources, which have at least two groups of spectrally differently emitting LEDs (4, 6),
wherein the LEDs (4, 6) of each of the groups are each arranged in a regular lattice and the at least two lattices are arranged intermeshing in the luminaire in a surface (2),
wherein a diffuser element (8), in particular a diffuser disk or a diffuser film, is arranged at a distance from said LED surface (2) so that the light from the LEDs (4, 6) is incident on the diffuser element,
wherein the LEDs (4, 6) each individually a lens body (10) is associated, which expands the light emitted from the LED light such that the LEDs each of a grid in their entirety irradiate the diffuser element with a homogeneous intensity distribution, and the intensity distributions of the two Grid of LEDs overlap on the diffuser element. Leuchte nach Anspruch 1, wobei jede LED (4) des ersten Gitters als nächste Nachbarn in der Fläche eine oder mehrere LEDs (6) des zweiten Gitters hat und insbesondere der Abstand (a, b) zwischen einer LED (4) des ersten Gitters zu allen nächsten Nachbarn, welche LED (6) aus dem zweiten Gitter bilden, jeweils gleich groß ist.Luminaire according to claim 1, wherein each LED (4) of the first grid has as nearest neighbors in the area one or more LEDs (6) of the second grid, and in particular the distance (a, b) between an LED (4) of the first grid all next neighbors, which form LED (6) from the second grid, each is the same size. Leuchte nach einem der vorhergehenden Ansprüche, wobei die wenigstens zwei LED-Gitter mit einem Winkel zwischen 30° und 70°, insbesondere um 45°, zueinander versetzt angeordnet sind.Luminaire according to one of the preceding claims, wherein the at least two LED grids are arranged offset to one another with an angle between 30 ° and 70 °, in particular by 45 °. Leuchte nach einem der vorhergehenden Ansprüche, wobei die LEDs (4, 6) innerhalb jeweils eines Gitters mit gleichem Abstand aufweisen, insbesondere in einem orthogonalen Gitter angeordnet sind.Luminaire according to one of the preceding claims, wherein the LEDs (4, 6) within each of a grid having the same distance, in particular in an orthogonal grid are arranged. Leuchte nach einem der vorhergehenden Ansprüche, wobei die LEDs (4, 6) der zwei Gitter auf unterschiedlichen Platinen angeordnet sind.Luminaire according to one of the preceding claims, wherein the LEDs (4, 6) of the two gratings are arranged on different boards. Leuchte nach Anspruch 5, wobei die Platinen jeweils eines Gitters kammförmig, schlangenförmig oder sägezahnförmig ineinandergreifen.Luminaire according to claim 5, wherein the boards each mesh a comb-shaped, serpentine or sawtooth-shaped. Leuchte nach einem der vorhergehenden Ansprüche, wobei die Linsenkörper (10) jeweils eine Lichtverteilung der LED in einer Schnittebene, in welcher die optische Achse der LED liegt, erzeugen, die zwei symmetrische Maxima in einem Winkelbereich von ±40° bis ±80°, bevorzugt zwischen ±50° und ±70°, von der optischen Achse aus gemessen aufweisen.Luminaire according to one of the preceding claims, wherein the lens body (10) each generate a light distribution of the LED in a sectional plane in which the optical axis of the LED is located, the two symmetrical maxima in an angular range of ± 40 ° to ± 80 °, preferably between ± 50 ° and ± 70 ° measured from the optical axis. Leuchte nach einem der vorhergehenden Ansprüche, wobei die Linsenkörper (10) jeweils eine rotationssymmetrische Lichtverteilung erzeugen.Luminaire according to one of the preceding claims, wherein the lens body (10) each generate a rotationally symmetrical light distribution. Leuchte nach einem der Ansprüche 1 bis 7, wobei die Linsenkörper (10) als Freiform-linsen ausgeführt sind, welche in den Hauptebenen C0-C180 und C90-C270 eine erste Lichtverteilung und in den Hauptebenen C45-C225 und C135-C315 eine zweite von der ersten verschiebende Lichtverteilung erzeugen, wobei insbesondere die zweite Lichtverteilung breiter als die erste Lichtverteilung ist.Luminaire according to one of claims 1 to 7, wherein the lens body (10) are designed as free-form lenses, which in the main planes C0-C180 and C90-C270 a first light distribution and in the main planes C45-C225 and C135-C315 a second of generate the first shifting light distribution, in particular, the second light distribution is wider than the first light distribution. Leuchte nach einem der vorhergehenden Ansprüche, wobei die Linsenkörper (10) des ersten LED-Gitters (4) jeweils in einer Schnittebene, welche die optische Achse der LEDs jeweils enthält, eine Lichtverteilung mit zwei Maxima in einem symmetrischen Winkelbereich erzeugen und die Linsenkörper (10) des zweiten LED-Gitters jeweils in einer Schnittebene, welche die optische Achse der LED enthält, eine Lichtverteilung mit zwei Maxima erzeugen, und die LEDs (4, 6) der beiden Gitter in einem solchen Abstand angeordnet sind und das Diffusorelement (8) gegenüber der Fläche (2) der LEDs (4, 6) einen solchen Abstand aufweist, dass sich die Richtungsstrahlen von zwei Maxima benachbarter LEDs in den jeweiligen Schnittebenen sich überschneiden, bevor das Licht auf das Diffusorelement (8) auftrifft.Luminaire according to one of the preceding claims, wherein the lens body (10) of the first LED grid (4) respectively in a sectional plane which contains the optical axis of the LEDs respectively, generate a light distribution with two maxima in a symmetrical angular range and the lens body (10 ) of the second LED grid respectively in a sectional plane containing the optical axis of the LED generate a light distribution with two maxima, and the LEDs (4, 6) of the two gratings are arranged at such a distance and the diffuser element (8) opposite the surface (2) of the LEDs (4, 6) has a distance such that the directional beams of two maxima of adjacent LEDs in the respective sectional planes overlap before the light impinges on the diffuser element (8). Leuchte nach einem der vorherigen Ansprüche, wobei auf der den LEDs (4, 6) abgewandten Seite des Diffusorelements (8) ein optisch strukturiertes transparentes Element (12) angeordnet ist, insbesondere eine Prismenplatte.Luminaire according to one of the preceding claims, wherein on the side facing away from the LEDs (4, 6) of the diffuser element (8) an optically structured transparent element (12) is arranged, in particular a prism plate. Leuchte nach Anspruch 11, wobei das Diffusorelement (8) und das optisch strukturierte transparente Element (12) in einem Abstand (c) zwischen 1 µm bis 0,5 mm angeordnet sind oder einen in einem Abstand (d) zwischen 0,5 mm bis 20 mm oder in einem Abstand in einem Bereich zwischen 15 mm und 30 mm angeordnet ist, wobei der Abstand insbesondere durch einen Luftspalt gebildet ist.Luminaire according to claim 11, wherein the diffuser element (8) and the optically structured transparent element (12) at a distance (c) between 1 .mu.m to 0.5 mm or one at a distance (d) between 0.5 mm to 20 mm or at a distance in a range between 15 mm and 30 mm, wherein the distance is in particular formed by an air gap. Leuchte nach einem der vorhergehenden Ansprüche, wobei die LEDs (4) des ersten Gitters und die LEDs (6) des wenigstens einen zweiten Gitters getrennt voneinander schaltbar, insbesondere dimmbar sind.Luminaire according to one of the preceding claims, wherein the LEDs (4) of the first grid and the LEDs (6) of the at least one second grid are separately switchable, in particular dimmable. Leuchte nach einem der vorhergehenden Ansprüche, wobei die Leuchte eine flache Bauform aufweist, wobei die Tiefe der Leuchte gemessen in der Richtung senkrecht zu der Flächennormalen der LED-Anordnung weniger als 15% beträgt als die maximale Ausdehnung in einer Längserstreckung oder zwei orthogonalen Längserstreckungen der LED-Fläche.Luminaire according to one of the preceding claims, wherein the luminaire has a flat design, wherein the depth of the luminaire measured in the direction perpendicular to the surface normal of the LED array less than 15% than the maximum extension in one longitudinal extension or two orthogonal longitudinal extents of the LED -Area. Leuchte nach einem der vorhergehenden Ansprüche, wobei der Abstand (a, b) der LEDs (4, 6) zum jeweils nächsten Nachbarn des jeweils anderen Gitters wenigstens 50% von dem Abstand (h) beträgt, in welchem das Diffusorelement (8) zu der Fläche (2) der LEDs angeordnet ist.Luminaire according to one of the preceding claims, wherein the distance (a, b) of the LEDs (4, 6) to each nearest neighbor of the respective other grid is at least 50% of the distance (h) in which the diffuser element (8) to the Surface (2) of the LEDs is arranged.
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DE102014104336A1 (en) 2015-10-01
EP2924343B1 (en) 2017-05-17

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