EP2076897B1 - Led light module having a reflector - Google Patents

Led light module having a reflector Download PDF

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Publication number
EP2076897B1
EP2076897B1 EP07820736A EP07820736A EP2076897B1 EP 2076897 B1 EP2076897 B1 EP 2076897B1 EP 07820736 A EP07820736 A EP 07820736A EP 07820736 A EP07820736 A EP 07820736A EP 2076897 B1 EP2076897 B1 EP 2076897B1
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EP
European Patent Office
Prior art keywords
side walls
light
light module
floor
partial areas
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Not-in-force
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EP07820736A
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German (de)
French (fr)
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EP2076897A1 (en
Inventor
Martin Michel
Mathias Benz
Alex Janutin
Urs A. Weidmann
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Innoled AG
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Innoled AG
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Priority claimed from PCT/EP2007/060350 external-priority patent/WO2008040690A1/en
Publication of EP2076897A1 publication Critical patent/EP2076897A1/en
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  • the invention relates to a light module referred to in the preamble of claim 1 Art.
  • Such light modules are available in many designs, on the one hand as modules, whose dimensions correspond to a predetermined standard and which are joined together to form a coherent ceiling or wall, which in turn serves as a means of illumination.
  • modules with special masses for specific applications, e.g. as a lighting device in a kitchen.
  • modules are used as light boxes for labels, signaling, as well as advertising purposes and as scoreboards.
  • Conventional light modules usually contain fluorescent lamps whose disadvantages are the high power consumption and the limited life.
  • the display element includes a bottom, side walls and a translucent cover plate, and a plurality of LEDs mounted on a sidewall.
  • the floor is provided with white reflection plates.
  • the cover plate consists of a diffusely scattering plate and a translucent film with the graphic element.
  • the invention has for its object to develop a light module that has a lower power consumption and virtually no maintenance during the entire life.
  • the light module according to the invention contains commercially available light-emitting diodes, which are generally known as LEDs (light-emitting diodes). Their power consumption is the fraction of the power consumption of a fluorescent, incandescent or halogen lamp with the same light output.
  • the light module comprises a base element and a cover plate that can be detachably fastened to the base element.
  • the cover plate is translucent, but not transparent. It diffuses incident light diffusely.
  • the bottom element has a bottom and two projecting from the ground, opposite side walls. On each of the two side walls, a bar is attached, which is inclined relative to the side wall at a predetermined angle. On the side of the ledge facing the floor, there are LEDs that shine towards the floor.
  • the floor is designed to reflect light.
  • the reflection properties of the floor are changed towards the two side walls in order to compensate for the light radiation of the LEDs falling off towards the center and reflecting from the ground.
  • the room which is bounded by the floor element and the cover plate, there is air. Waveguides and / or optical fibers are not needed. This space and thus the entire light module is therefore free of light-conducting components.
  • the floor is subdivided into a multiplicity of first and second partial surfaces.
  • the area occupied by the first partial areas decreases in a certain area compared to the area occupied by the second partial areas with increasing distance from the side wall to the middle between the two Sidewalls towards.
  • the first partial surfaces differ from the second partial surfaces in the reflection characteristic: the first partial surfaces scatter the light non-diffusely, whereas the second partial surfaces scatter the light diffusely in comparison.
  • the first partial surfaces are for example made of high-gloss aluminum and have a reflective surface, while the second part surfaces are provided with a matt white surface.
  • the first partial areas differ from the second partial areas in the reflectivity, the reflectivity R 1 of the first partial areas being greater than the reflectivity R 2 of the second partial areas.
  • the light module according to the invention comprises a base element and a cover plate that can be detachably fastened to the base element.
  • the Fig. 1 shows the bottom element 1 in supervision.
  • the Fig. 2 shows the bottom element 1 with the cover plate 2 in a section along the line II of Fig. 1 ,
  • the floor element 1 consists of a floor 3 and at least two opposite, projecting from the bottom 3 side walls 4 and 5. In many applications, however, the floor element 1 contains four side walls 4 to 7, which form a peripheral wall. On the first side wall 4 and on the second, opposite side wall 5, a bar 8 is attached. The bar 8 is inclined relative to the side wall 4 and 5 at a predetermined angle ⁇ .
  • strips 9 are mounted with light emitting diodes 10 (LED).
  • LED light emitting diodes
  • the strips 9 contain, for example, LED's 10 arranged in a row, which all emit white light, or LEDs 10 according to the RGB standard, of which every third red light, green light or blue light alternately emits.
  • a controller controls the LED's 10. If red, green and blue LED's 10 are present, then the controller can control the LED's 10 so that the light module lights in any color.
  • the space bounded by the bottom 3, the side walls 4, 5 and optionally 6, 7 and the cover plate is filled with air, but this space is not sealed airtight to the environment. Light-conducting elements such as waveguides and / or light guides are not needed.
  • the LED's 10 illuminate the bottom 3, which is light-reflecting and serves as a reflector.
  • the light emitted by the LED's 10 toward the ground light is therefore reflected at the bottom 3 and passes through the cover plate 2 into the open.
  • the cover plate 2 is translucent, but not transparent. Their task is to diffuse the incident light diffusely in all directions.
  • the cover plate 2 is for example a milky cloudy Plexiglas plate.
  • the angle ⁇ is chosen so that the light cone 11 of the LED's 10 in the region 12 of the center of the bottom 3 partially overlap.
  • the lighting of the bottom 3 by the LED's 10 is not uniform, because the intensity of the LED's 10 radiated light decreases with increasing distance from the side wall 4 and 5 respectively.
  • the reflection properties of the bottom 3 are therefore changed from the middle between the side walls 4 and 5 against the side wall 4 and 5, so that the cover plate 2 appears evenly bright to the human eye.
  • the reflectivity of the bottom 3 is advantageously at a maximum, at least in the middle.
  • the Fig. 2 illustrate the same long arrows 13, the uniformity of the light radiation emitted by the cover plate 2 light.
  • the bottom 3 of the bottom element 1 advantageously has a surface that is as white and as matt as possible, which diffuses the incident light as diffusely as possible and onto which a reflection layer structured in the surface is applied, which consists for example of high-gloss aluminum.
  • the bottom 3 is thus divided into at least a first partial surface of high-gloss aluminum and second partial surfaces with a matt, white surface.
  • the color of the white surface is, for example, the "whitish white 9016" known as the whitest white.
  • the matt surface reflects the incident light diffusely.
  • the color white causes a very large proportion of the incident light to be scattered back and only a very small portion of the incident light to be absorbed.
  • the reflection layer reflects the incident light non-diffusely (in comparison).
  • both the first and the second partial surfaces have a high reflectivity, results in a high luminous efficacy.
  • the bottom element 1 can be made of metal, for example, whose surface is stove-enamelled, or made of plastic.
  • the reflectivity of such a surface is relatively low, ie the surface acts as an absorption layer, which absorbs a large proportion of the incident light.
  • a surface-structured reflection layer is applied, so that the reflectivity of the bottom 3 increases from the side walls 4 and 5 toward the center between the side walls 4 and 5.
  • the reflective layer may be, for example, a reflective foil or a vapor deposited metal layer or simply a white surface.
  • the Fig. 3 shows the bottom 3 and the side walls 4 to 7 in supervision.
  • the drawing is not drawn to scale.
  • the floor 3 is divided into two areas: a first contiguous area 14 and a second area 15 complementary to the first area 14 (The area 15 consists of two separate subdivisions, located in the Fig. 3 left and right of the first area 14).
  • the first region 14 of the bottom 3 is covered with a reflection layer 16.
  • the edge 17 of the first region 14 is formed on the side wall 4 and on the side wall 5 facing side sawtooth.
  • the Fig. 4 shows the in the Fig. 3 area C bounded by a dashed line to explain details of the invention.
  • the first side wall 4 is shown only to illustrate the position of the region C relative to the first side wall 4.
  • the entire bottom 3 of the bottom element 1 is by definition subdividable into first part surfaces 19 with first reflection properties and second part surfaces 20 with second reflection properties. Again Fig. 4 can be easily seen, takes the occupied by the first partial surfaces 19 area compared to the area occupied by the second partial surfaces 20 surface in the region of the sawtooth with increasing distance from the side wall 4 to.
  • the shape of the edge 17 between the two regions 14 and 15 is not limited to the sawtooth shape.
  • the edge 17 may also be sinusoidal, wavy, etc., or bounded by exponential curve curves.
  • the first partial areas 19 are designed such that they reflect the incident light non-diffusely, and the second partial areas 20 so that they reflect the incident light diffusely, then this means that the light emitted by the LED's 10, the light on the first Area 14 is incident as reflected on a mirror and that emitted by the LED's 10 light incident on the second area 15, is scattered very wide. In the region of the sawtooth, the reflection characteristic of the bottom 3 thus changes.
  • the reflection layer 16 does not form a contiguous area but consists of a multiplicity of first partial areas 19 and second partial areas 20.
  • the density of the first partial areas 19 increases from the side walls 4 and 5 toward the center.
  • the first faces 19 are dots as shown. The points can be distributed regularly or randomly. The size of the dots is of minor importance, it can vary from a few microns to a few millimeters or even centimeters. This example is particularly suitable if the reflection layer 16 is produced by vapor deposition of metal or by spraying on a material which is otherwise reflective, for example by screen printing.
  • the area occupied by the first partial surfaces 19 increases in comparison with the area occupied by the second partial surfaces 20 with increasing distance from the side wall 4.
  • One Area 12, which is located in the middle between the two side walls 4 and 5, is completely covered with the reflection layer 16, since it is a question that the light module glows as bright as possible for a given power of the LED's 10.
  • the light module according to the invention ensures uniform brightness distribution over the entire, diffusely scattering, translucent cover plate 2.

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  • Illuminated Signs And Luminous Advertising (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A light module comprises a base element (1), which has a base (3) and two side walls (4, 5) opposing each other and disposed at a distance from the base (3), and a cover plate that can be attached to the base element (1), wherein the cover plate is translucent and diffusely scatters incident light. A strip (8) is attached on each of the two side walls (4, 5), the strip being inclined in relation to the side wall (4, 5) at a predetermined angle. LEDs (10) are mounted on the side of the strip (8) facing the base (3) to illuminate the base (3). The base (3) is configured in a light reflecting manner, wherein the reflection properties of the base (3) are different in the region of the center between the two side walls (4, 5) than in the vicinity of the two side walls (4, 5). The light module ensures uniform distribution of brightness across the entire diffusely scattering translucent cover plate.

Description

Die Erfindung betrifft ein Lichtmodul der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a light module referred to in the preamble of claim 1 Art.

Solche Lichtmodule gibt es in vielen Ausführungen, einerseits als Module, deren Abmessungen einer vorgegebenen Norm entsprechen und die zusammengefügt werden, um eine zusammenhängende Decke oder Wand zu bilden, die ihrerseits als Beleuchtungsmittel dient. Andererseits gibt es auch Module mit Spezialmassen für spezifische Einsatzzwecke, z.B. als Beleuchtungsmittel in einer Küche. Des weiteren werden solche Module eingesetzt als Leuchtkästen für Beschriftungen, Signalisierungen, sowie Reklamezwecke und als Anzeigetafeln. Konventionelle Lichtmodule enthalten meist Fluoreszenzlampen, deren Nachteile der hohe Stromverbrauch und die begrenzte Lebensdauer sind.Such light modules are available in many designs, on the one hand as modules, whose dimensions correspond to a predetermined standard and which are joined together to form a coherent ceiling or wall, which in turn serves as a means of illumination. On the other hand, there are also modules with special masses for specific applications, e.g. as a lighting device in a kitchen. Furthermore, such modules are used as light boxes for labels, signaling, as well as advertising purposes and as scoreboards. Conventional light modules usually contain fluorescent lamps whose disadvantages are the high power consumption and the limited life.

Aus der JP 2005031596 ist ein Anzeigeelement für die Anzeige eines grafischen Elements gemäss dem Oberbegriff des Anspruchs 1 bekannt. Das Anzeigeelement enthält einen Boden, Seitenwände und eine lichtdurchlässige Abdeckplatte, sowie eine Vielzahl von LEDs, die an einer Seitenwand angebracht sind. Der Boden ist mit weissen Reflexionsplatten versehen. Die Abdeckplatte besteht aus einer diffus streuenden Platte und einem lichtdurchlässigen Film mit dem grafischen Element.From the JP 2005031596 a display element for the display of a graphical element according to the preamble of claim 1 is known. The display element includes a bottom, side walls and a translucent cover plate, and a plurality of LEDs mounted on a sidewall. The floor is provided with white reflection plates. The cover plate consists of a diffusely scattering plate and a translucent film with the graphic element.

Der Erfindung liegt die Aufgabe zugrunde, ein Lichtmodul zu entwickeln, das einen geringeren Stromverbrauch und während der gesamten Lebensdauer praktisch keinen Wartungsaufwand hat.The invention has for its object to develop a light module that has a lower power consumption and virtually no maintenance during the entire life.

Die genannte Aufgabe wird erfindungsgemäss gelöst durch die Merkmale des Anspruchs 1.The stated object is achieved according to the invention by the features of claim 1.

Das erfindungsgemässe Lichtmodul enthält als Beleuchtungsmittel im Handel erhältliche Leuchtdioden, die allgemein als LED's (light emitting diodes) bekannt sind. Deren Stromverbrauch beträgt bei gleicher Lichtleistung den Bruchteil des Stromverbrauchs einer Fluoreszenz-, Glüh- oder Halogenlampe. Das Lichtmodul umfasst ein Bodenelement und eine lösbar am Bodenelement befestigbare Abdeckplatte. Die Abdeckplatte ist lichtdurchlässig, aber nicht durchsichtig. Sie streut auftreffendes Licht diffus. Das Bodenelement weist einen Boden und zwei vom Boden abstehende, einander gegenüberliegende Seitenwände auf. An jeder der beiden Seitenwände ist eine Leiste befestigt, die gegenüber der Seitenwand unter einem vorbestimmten Winkel geneigt ist. Auf der dem Boden zugewandten Seite der Leiste befinden sich LED's, die zum Boden hin leuchten. Der Boden ist lichtreflektierend ausgebildet. Die Reflexionseigenschaften des Bodens werden gegen die beiden Seitenwände hin verändert, um die zur Mitte hin abfallende, vom Boden zu reflektierende Lichtstrahlung der LED's zu kompensieren. Im Raum, der durch das Bodenelement und die Abdeckplatte begrenzt ist, befindet sich Luft. Wellenleiter und/oder Lichtleiter werden nicht benötigt. Dieser Raum und somit das ganze Lichtmodul ist also frei von lichtleitenden Bauteilen.The light module according to the invention contains commercially available light-emitting diodes, which are generally known as LEDs (light-emitting diodes). Their power consumption is the fraction of the power consumption of a fluorescent, incandescent or halogen lamp with the same light output. The light module comprises a base element and a cover plate that can be detachably fastened to the base element. The cover plate is translucent, but not transparent. It diffuses incident light diffusely. The bottom element has a bottom and two projecting from the ground, opposite side walls. On each of the two side walls, a bar is attached, which is inclined relative to the side wall at a predetermined angle. On the side of the ledge facing the floor, there are LEDs that shine towards the floor. The floor is designed to reflect light. The reflection properties of the floor are changed towards the two side walls in order to compensate for the light radiation of the LEDs falling off towards the center and reflecting from the ground. In the room, which is bounded by the floor element and the cover plate, there is air. Waveguides and / or optical fibers are not needed. This space and thus the entire light module is therefore free of light-conducting components.

Der Boden ist in eine Vielzahl von ersten und zweiten Teilflächen unterteilbar. Die von den ersten Teilflächen belegte Fläche nimmt in einem gewissen Gebiet im Vergleich zu der von den zweiten Teilflächen belegten Fläche mit zunehmendem Abstand von der Seitenwand zur Mitte zwischen den Seitenwänden hin zu. Bei einer bevorzugten Ausführung unterscheiden sich die ersten Teilflächen von den zweiten Teilflächen in der Reflexionscharakteristik: die ersten Teilflächen streuen das Licht nicht-diffus, die zweiten Teilflächen streuen das Licht hingegen im Vergleich dazu diffus. Die ersten Teilflächen sind beispielsweise aus Hochglanz-Aluminium und haben eine spiegelnde Oberfläche, während die zweiten Teilflächen mit einer matten weissen Oberfläche versehen sind. Bei einer alternativen Ausführung unterscheiden sich die ersten Teilflächen von den zweiten Teilflächen im Reflexionsvermögen, wobei das Reflexionsvermögen R1 der ersten Teilflächen grösser als das Reflexionsvermögen R2 der zweiten Teilflächen ist.The floor is subdivided into a multiplicity of first and second partial surfaces. The area occupied by the first partial areas decreases in a certain area compared to the area occupied by the second partial areas with increasing distance from the side wall to the middle between the two Sidewalls towards. In a preferred embodiment, the first partial surfaces differ from the second partial surfaces in the reflection characteristic: the first partial surfaces scatter the light non-diffusely, whereas the second partial surfaces scatter the light diffusely in comparison. The first partial surfaces are for example made of high-gloss aluminum and have a reflective surface, while the second part surfaces are provided with a matt white surface. In an alternative embodiment, the first partial areas differ from the second partial areas in the reflectivity, the reflectivity R 1 of the first partial areas being greater than the reflectivity R 2 of the second partial areas.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen und anhand der Zeichnung näher erläutert. Die Figuren sind nicht massstäblich gezeichnet.

Fig. 1
zeigt in Aufsicht ein Bodenelement eines Lichtmoduls,
Fig. 2
zeigt das Bodenelement mit aufgebrachter Abdeckplatte des Lichtmoduls in einem Schnitt entlang der Linie I-I der Fig. 1,
Fig. 3, 5
illustrieren Möglichkeiten, das Reflexionsvermögen des Bodens des Bodenelements mittels einer strukturierten Reflexionsschicht lokal zu verändern, und
Fig. 4
zeigt Details der Erfindung anhand eines Ausschnitts der Fig. 3.
The invention will be explained in more detail with reference to embodiments and with reference to the drawing. The figures are not drawn to scale.
Fig. 1
shows in plan view a bottom element of a light module,
Fig. 2
shows the bottom element with applied cover plate of the light module in a section along the line II of Fig. 1 .
Fig. 3, 5
illustrate ways to locally change the reflectivity of the bottom of the floor element by means of a structured reflection layer; and
Fig. 4
shows details of the invention with reference to a section of Fig. 3 ,

Das erfindungsgemässe Lichtmodul umfasst ein Bodenelement und eine lösbar am Bodenelement befestigbare Abdeckplatte. Die Fig. 1 zeigt das Bodenelement 1 in Aufsicht. Die Fig. 2 zeigt das Bodenelement 1 mit der Abdeckplatte 2 in einem Schnitt entlang der Linie I-I der Fig. 1. Das Bodenelement 1 besteht aus einem Boden 3 und mindestens zwei einander gegenüberliegenden, vom Boden 3 abstehenden Seitenwänden 4 und 5. Bei vielen Anwendungen enthält das Bodenelement 1 jedoch vier Seitenwände 4 bis 7, die eine umlaufende Wand bilden. An der ersten Seitenwand 4 und an der zweiten, gegenüberliegenden Seitenwand 5 ist eine Leiste 8 befestigt. Die Leiste 8 ist gegenüber der Seitenwand 4 bzw. 5 unter einem vorbestimmten Winkel α geneigt. Auf der dem Boden 3 zugewandten Seite der Leiste 8 sind Streifen 9 mit Leuchtdioden 10 (LED) befestigt. Solche Streifen 9 sind im Handel in vielen Ausführungen erhältlich. Die Streifen 9 enthalten beispielsweise in einer Reihe angeordnete LED's 10, die alle weisses Licht abstrahlen, oder LED's 10 gemäss dem RGB Standard, von denen alternierend jede dritte rotes Licht, grünes Licht oder blaues Licht abstrahlt. Ein Steuergerät steuert die LED's 10 an. Wenn rote, grüne und blaue LED's 10 vorhanden sind, dann kann das Steuergerät die LED's 10 so ansteuern, dass das Lichtmodul in einer beliebigen Farbe leuchtet. Der durch den Boden 3, die Seitenwände 4, 5 und gegebenenfalls 6, 7 und die Abdeckplatte begrenzte Raum ist mit Luft gefüllt, allerdings ist dieser Raum nicht luftdicht gegen die Umgebung abgedichtet. Lichtleitende Elemente wie Wellenleiter und/oder Lichtleiter werden nicht benötigt.The light module according to the invention comprises a base element and a cover plate that can be detachably fastened to the base element. The Fig. 1 shows the bottom element 1 in supervision. The Fig. 2 shows the bottom element 1 with the cover plate 2 in a section along the line II of Fig. 1 , The floor element 1 consists of a floor 3 and at least two opposite, projecting from the bottom 3 side walls 4 and 5. In many applications, however, the floor element 1 contains four side walls 4 to 7, which form a peripheral wall. On the first side wall 4 and on the second, opposite side wall 5, a bar 8 is attached. The bar 8 is inclined relative to the side wall 4 and 5 at a predetermined angle α. On the bottom 3 side facing the strip 8 strips 9 are mounted with light emitting diodes 10 (LED). Such strips 9 are commercially available in many designs. The strips 9 contain, for example, LED's 10 arranged in a row, which all emit white light, or LEDs 10 according to the RGB standard, of which every third red light, green light or blue light alternately emits. A controller controls the LED's 10. If red, green and blue LED's 10 are present, then the controller can control the LED's 10 so that the light module lights in any color. The space bounded by the bottom 3, the side walls 4, 5 and optionally 6, 7 and the cover plate is filled with air, but this space is not sealed airtight to the environment. Light-conducting elements such as waveguides and / or light guides are not needed.

Die LED's 10 beleuchten den Boden 3, der lichtreflektierend ausgebildet ist und als Reflektor dient. Das von den LED's 10 zum Boden hin abgestrahlte Licht wird deshalb am Boden 3 reflektiert und gelangt durch die Abdeckplatte 2 hindurch ins Freie. Die Abdeckplatte 2 ist lichtdurchlässig, aber nicht durchsichtig. Ihre Aufgabe ist es, das auftreffende Licht diffus nach allen Seiten zu streuen. Die Abdeckplatte 2 ist z.B. eine milchig trübe Plexiglasplatte. Der Winkel α ist so gewählt, dass die Leuchtkegel 11 der LED's 10 im Bereich 12 der Mitte des Bodens 3 teilweise überlappen. Die Beleuchtung des Bodens 3 durch die LED's 10 ist nicht gleichmässig, weil die Intensität des von den LED's 10 abgestrahlten Lichts mit zunehmender Entfernung von der Seitenwand 4 bzw. 5 abnimmt. Die Reflexionseigenschaften des Bodens 3 werden deshalb von der Mitte zwischen den Seitenwänden 4 und 5 gegen die Seitenwand 4 bzw. 5 hin verändert, damit die Abdeckplatte 2 dem menschlichen Auge gleichmässig hell erscheint. Um bei vorgegebener Leistung der LED's 10 eine möglichst hohe Helligkeit des Lichtmoduls zu erreichen, ist das Reflexionsvermögen des Bodens 3 mit Vorteil zumindest in der Mitte maximal. In der Fig. 2 illustrieren die gleich langen Pfeile 13 die Gleichmässigkeit der Lichtstrahlung des von der Abdeckplatte 2 abgestrahlten Lichts.The LED's 10 illuminate the bottom 3, which is light-reflecting and serves as a reflector. The light emitted by the LED's 10 toward the ground light is therefore reflected at the bottom 3 and passes through the cover plate 2 into the open. The cover plate 2 is translucent, but not transparent. Their task is to diffuse the incident light diffusely in all directions. The cover plate 2 is for example a milky cloudy Plexiglas plate. The angle α is chosen so that the light cone 11 of the LED's 10 in the region 12 of the center of the bottom 3 partially overlap. The lighting of the bottom 3 by the LED's 10 is not uniform, because the intensity of the LED's 10 radiated light decreases with increasing distance from the side wall 4 and 5 respectively. The reflection properties of the bottom 3 are therefore changed from the middle between the side walls 4 and 5 against the side wall 4 and 5, so that the cover plate 2 appears evenly bright to the human eye. In order to achieve the highest possible brightness of the light module for a given power of the LED's 10, the reflectivity of the bottom 3 is advantageously at a maximum, at least in the middle. In the Fig. 2 illustrate the same long arrows 13, the uniformity of the light radiation emitted by the cover plate 2 light.

Der Boden 3 des Bodenelements 1 hat mit Vorteil eine möglichst weisse und möglichst matte Oberfläche, die auftreffendes Licht möglichst diffus streut und auf die eine in der Fläche strukturierte Reflexionsschicht aufgebracht ist, die beispielsweise aus Hochglanz-Aluminium besteht. Der Boden 3 ist also in mindestens eine erste Teilfläche aus Hochglanz-Aluminium und zweite Teilflächen mit matter, weisser Oberfläche unterteilt. Die Farbe der weissen Oberfläche ist beispielsweise das als weissestes Weiss bekannte "verkchrsweiss 9016". Die matte Oberfläche reflektiert das auftreffende Licht diffus. Die Farbe weiss bewirkt, dass ein sehr grosser Anteil des auftreffenden Lichts zurückgestreut und nur ein sehr geringer Anteil des auftreffenden Lichts absorbiert wird. Die Reflexionsschicht reflektiert das auftreffende Licht (im Vergleich dazu) hingegen nicht-diffus. Da sowohl die ersten als auch die zweiten Teilflächen ein hohes Reflexionsvermögen haben, ergibt sich eine hohe Lichtausbeute. Die Unterteilung der Oberfläche des Bodens 3 in erste und zweite Teilflächen mit unterschiedlicher Reflexionscharakteristik, nämlich diffuse Reflexion und nicht-diffuse Reflexion, bewirkt, dass der Rand der Abdeckplatte 2 gleich hell erscheint wie die mittleren Teile der Abdeckplatte 2.The bottom 3 of the bottom element 1 advantageously has a surface that is as white and as matt as possible, which diffuses the incident light as diffusely as possible and onto which a reflection layer structured in the surface is applied, which consists for example of high-gloss aluminum. The bottom 3 is thus divided into at least a first partial surface of high-gloss aluminum and second partial surfaces with a matt, white surface. The color of the white surface is, for example, the "whitish white 9016" known as the whitest white. The matt surface reflects the incident light diffusely. The color white causes a very large proportion of the incident light to be scattered back and only a very small portion of the incident light to be absorbed. The reflection layer reflects the incident light non-diffusely (in comparison). Since both the first and the second partial surfaces have a high reflectivity, results in a high luminous efficacy. The subdivision of the surface of the bottom 3 into first and second partial surfaces having different reflection characteristics, namely diffuse reflection and non-diffuse reflection, causes the edge of the cover plate 2 to appear as bright as the middle parts of the cover plate 2.

Eine andere Lösung besteht darin, den Boden 3 in erste und zweite Teilflächen zu unterteilen, die sich im Reflexionsvermögen unterscheiden, wobei das Reflexionsvermögen R1 der ersten Teilflächen grösser als das Reflexionsvermögen R2 der zweiten Teilflächen ist. Das Bodenelement 1 kann beispielsweise aus Metall, dessen Oberfläche einbrennlackiert ist, oder aus Kunststoff gefertigt sein. Das Reflexionsvermögen einer solchen Oberfläche ist relativ gering, d.h. die Oberfläche wirkt als Absorptionsschicht, die einen grossen Anteil des auftreffenden Lichts absorbiert. Auf den Boden 3 wird eine in der Fläche strukturierte Reflexionsschicht aufgebracht, so dass das Reflexionsvermögen des Bodens 3 ausgehend von den Seitenwänden 4 und 5 zur Mitte zwischen den Seitenwänden 4 und 5 hin zunimmt. Die Reflexionsschicht kann zum Beispiel eine reflektierende Folie oder eine durch Aufdampfen aufgebrachte Metallschicht oder einfach eine weisse Fläche sein.Another solution consists in subdividing the bottom 3 into first and second sub-areas, which differ in their reflectivity, the reflectivity R 1 of the first sub-areas being greater than the reflectivity R 2 of the second sub-areas. The bottom element 1 can be made of metal, for example, whose surface is stove-enamelled, or made of plastic. The reflectivity of such a surface is relatively low, ie the surface acts as an absorption layer, which absorbs a large proportion of the incident light. On the bottom 3, a surface-structured reflection layer is applied, so that the reflectivity of the bottom 3 increases from the side walls 4 and 5 toward the center between the side walls 4 and 5. The reflective layer may be, for example, a reflective foil or a vapor deposited metal layer or simply a white surface.

Im folgenden werden verschiedene Beispiele vorgestellt, wie die Reflexionsschicht bei den oben beschriebenen Lösungen strukturiert sein kann.In the following, various examples are presented how the reflection layer can be structured in the solutions described above.

Beispiel 1example 1

Die Fig. 3 zeigt den Boden 3 und die Seitenwände 4 bis 7 in Aufsicht. Die Zeichnung ist nicht massstäblich gezeichnet. Der Boden 3 ist in zwei Gebiete unterteilt: ein erstes, zusammenhängendes Gebiet 14 und ein zweites, zum ersten Gebiet 14 komplementäres Gebiet 15 (Das Gebiet 15 besteht aus zwei getrennten Teilgebieten, die sich in der Fig. 3 links und rechts des ersten Gebiets 14 befinden). Das erste Gebiet 14 des Bodens 3 ist mit einer Reflexionsschicht 16 bedeckt. Der Rand 17 des ersten Gebiets 14 ist auf der der Seitenwand 4 und auf der der Seitenwand 5 zugewandten Seite sägezahnförmig ausgebildet.The Fig. 3 shows the bottom 3 and the side walls 4 to 7 in supervision. The drawing is not drawn to scale. The floor 3 is divided into two areas: a first contiguous area 14 and a second area 15 complementary to the first area 14 (The area 15 consists of two separate subdivisions, located in the Fig. 3 left and right of the first area 14). The first region 14 of the bottom 3 is covered with a reflection layer 16. The edge 17 of the first region 14 is formed on the side wall 4 and on the side wall 5 facing side sawtooth.

Die Fig. 4 zeigt den in der Fig. 3 durch eine gestrichelte Linie berandeten Bereich C, um Details der Erfindung zu erläutern. (Die erste Seitenwand 4 ist nur dargestellt, um die Lage des Bereichs C relativ zur ersten Seitenwand 4 zu illustrieren.) Der gesamte Boden 3 des Bodenelements 1 ist per Definition unterteilbar in erste Teilflächen 19 mit ersten Reflexionseigenschaften und zweite Teilflächen 20 mit zweiten Reflexionseigenschaften. Wie der Fig. 4 leicht zu entnehmen ist, nimmt die von den ersten Teilflächen 19 belegte Fläche im Vergleich zu der von den zweiten Teilflächen 20 belegten Fläche im Bereich des Sägezahns mit zunehmendem Abstand von der Seitenwand 4 zu.The Fig. 4 shows the in the Fig. 3 area C bounded by a dashed line to explain details of the invention. (The first side wall 4 is shown only to illustrate the position of the region C relative to the first side wall 4.) The entire bottom 3 of the bottom element 1 is by definition subdividable into first part surfaces 19 with first reflection properties and second part surfaces 20 with second reflection properties. Again Fig. 4 can be easily seen, takes the occupied by the first partial surfaces 19 area compared to the area occupied by the second partial surfaces 20 surface in the region of the sawtooth with increasing distance from the side wall 4 to.

Ein Praxistest für ein Lichtmodul, das entsprechend einer weit verbreiteten Norm eine Grösse von 60 cm * 60 cm aufwies, hat gezeigt, dass die Spitzen des Sägezahns durchaus nicht bis zur Mitte (dargestellt durch die Linie 18) zwischen den beiden Seitenwänden 4 und 5 reichen müssen, sondern dass bereits relativ kurze Spitzen mit einer Länge B von 5 bis 10 cm ausreichen.A practical test for a light module having a size of 60 cm * 60 cm, according to a widely used standard, has shown that the tips of the sawtooth do not extend to the center (represented by the line 18) between the two side walls 4 and 5 but that are already relatively short tips with a length B of 5 to 10 cm sufficient.

Die Form des Randes 17 zwischen den beiden Gebieten 14 und 15 ist nicht auf die Sägezahnform beschränkt. Der Rand 17 kann beispielsweise auch sinusförmig, wellenförmig, usw. sein oder durch Kurven mit exponentiellem Verlauf begrenzt sein.The shape of the edge 17 between the two regions 14 and 15 is not limited to the sawtooth shape. For example, the edge 17 may also be sinusoidal, wavy, etc., or bounded by exponential curve curves.

Wenn die ersten Teilflächen 19 so ausgebildet sind, dass sie das auftreffende Licht nicht-diffus reflektieren, und die zweiten Teilflächen 20 so, dass sie das auftreffende Licht diffus reflektieren, dann bedeutet dies, dass von den LED's 10 abgestrahltes Licht, das auf das erste Gebiet 14 auftrifft, wie an einem Spiegel reflektiert wird und dass von den LED's 10 abgestrahltes Licht, das auf das zweite Gebiet 15 auftrifft, sehr breit gestreut wird. Im Bereich des Sägezahns ändert somit die Reflexionscharakteristik des Bodens 3.If the first partial areas 19 are designed such that they reflect the incident light non-diffusely, and the second partial areas 20 so that they reflect the incident light diffusely, then this means that the light emitted by the LED's 10, the light on the first Area 14 is incident as reflected on a mirror and that emitted by the LED's 10 light incident on the second area 15, is scattered very wide. In the region of the sawtooth, the reflection characteristic of the bottom 3 thus changes.

Beispiel 2Example 2

Bei diesem, in der Fig. 5 dargestellten Beispiel bildet die Reflexionsschicht 16 nicht ein zusammenhängendes Gebiet, sondern besteht aus einer Vielzahl von ersten Teilflächen 19 und zweiten Teilflächen 20. Die Dichte der ersten Teilflächen 19 nimmt von den Seitenwänden 4 und 5 zur Mitte hin zu. Die ersten Teilflächen 19 sind beispielsweise wie dargestellt Punkte. Die Punkte können regelmässig oder zufällig verteilt sein. Die Grösse der Punkte ist von untergeordneter Bedeutung, sie kann variieren von wenigen Mikrometern bis zu einigen Millimetern oder sogar Zentimetern. Dieses Beispiel eignet sich insbesondere dann, wenn die Reflexionsschicht 16 durch Aufdampfen von Metall oder durch Aufspritzen eines anderweitig reflektierenden Materials, z.B. im Siebdruckverfahren, hergestellt wird. Auch bei diesem Beispiel nimmt also die von den ersten Teilflächen 19 belegte Fläche im Vergleich zu der von den zweiten Teilflächen 20 belegten Fläche mit zunehmendem Abstand von der Seitenwand 4 zu. Ein Bereich 12, der in der Mitte zwischen den beiden Seitenwänden 4 und 5 liegt, ist vollständig mit der Reflexionsschicht 16 bedeckt, da es ja darum geht, dass das Lichtmodul bei vorgegebener Leistung der LED's 10 möglichst hell leuchtet.In this, in the Fig. 5 As illustrated, the reflection layer 16 does not form a contiguous area but consists of a multiplicity of first partial areas 19 and second partial areas 20. The density of the first partial areas 19 increases from the side walls 4 and 5 toward the center. For example, the first faces 19 are dots as shown. The points can be distributed regularly or randomly. The size of the dots is of minor importance, it can vary from a few microns to a few millimeters or even centimeters. This example is particularly suitable if the reflection layer 16 is produced by vapor deposition of metal or by spraying on a material which is otherwise reflective, for example by screen printing. In this example as well, the area occupied by the first partial surfaces 19 increases in comparison with the area occupied by the second partial surfaces 20 with increasing distance from the side wall 4. One Area 12, which is located in the middle between the two side walls 4 and 5, is completely covered with the reflection layer 16, since it is a question that the light module glows as bright as possible for a given power of the LED's 10.

Um eine gleichmässige Helligkeit des Lichtmoduls zu erreichen, ist es oftmals nötig, weitere Massnahmen vorzusehen, um zu vermeiden, dass die LED's 10 die anderen Seitenwände 6 und 7 beleuchten. Dies könnte nämlich zu unerwünschten, helleren Bereichen auf der Abdeckplatte 2 führen. Um dies zu verhindern, gibt es zwei Möglichkeiten:

  • 1. Die beiden äussersten LED's 10 einer Leiste 8 werden in einem vorbestimmten Mindestabstand A (Fig. 1) zur benachbarten Seitenwand 6 bzw. 7 angeordnet, so dass kein oder fast kein direkt von den LED's 10 abgestrahltes Licht auf die Seitenwände 6 und 7 auftrifft. Bei dem in der Fig. 1 gezeigten Beispiel sind dies bei der einen Leiste 8 die LED's 10.1,1 und 10.1,n, bei der anderen Leiste 8 die LED's 10.2,1 und 10.2,n.
  • 2a. Die Seitenwände 6 und 7 sind aus einem Material oder auf der dem Boden 3 zugewandten Seite mit einem Material beschichtet, das ein grosses Absorptionsvermögen für Licht bzw. geringes Reflexionsvermögen für Licht hat. Das Absorptionsvermögen für Licht ist so gross, dass die Abdeckplatte 2 dem menschlichen Auge gleichmässig hell erscheint.
  • 2b. Die Seitenwände 6 und 7 können alternativ ebenfalls mit sehr weisser und matter Oberfläche ausgeführt sein, damit sie das auftreffende Licht diffus reflektieren, d.h. möglichst breit streuen.
In order to achieve a uniform brightness of the light module, it is often necessary to provide further measures to avoid that the LEDs 10 illuminate the other side walls 6 and 7. This could in fact lead to undesirable, brighter areas on the cover plate 2. To prevent this, there are two possibilities:
  • 1. The two outermost LEDs 10 of a bar 8 are at a predetermined minimum distance A ( Fig. 1 ) to the adjacent side wall 6 and 7, respectively, so that no or almost no light emitted directly from the LED's 10 impinges on the side walls 6 and 7. In the in the Fig. 1 In the example shown, these are the LED's 10.1.1 and 10.1, n in the one strip 8, the LEDs 10.2, 1 and 10.2, n in the other strip 8.
  • 2a. The side walls 6 and 7 are coated from a material or on the side facing the bottom 3 with a material which has a high light absorption capacity and low light reflectance, respectively. The absorption capacity for light is so great that the cover plate 2 appears evenly bright to the human eye.
  • 2 B. The side walls 6 and 7 can alternatively also be designed with a very white and matt surface, so that they reflect the incident light diffusely, ie scatter as widely as possible.

Die genannten Möglichkeiten können auch kombiniert werden. Sie bewirken einzeln oder in Kombination, dass die Abdeckplatte 2 gleichmässig hell leuchtet und also keine helleren Bereiche aufweist.The options mentioned can also be combined. They effect, individually or in combination, that the cover plate 2 is uniformly bright and therefore has no brighter areas.

Das erfindungsgemässe Lichtmodul gewährleistet eine gleichmässige Helligkeitsverteilung über die gesamte, diffus streuende, lichtdurchlässige Abdeckplatte 2.The light module according to the invention ensures uniform brightness distribution over the entire, diffusely scattering, translucent cover plate 2.

Es ist auch möglich, dass mehrere Lichtmodule eine gemeinsame Abdeckplatte 2 haben.It is also possible that a plurality of light modules have a common cover plate 2.

Claims (8)

  1. Light module, comprising a floor element (1) with a light-reflecting floor (3) and two side walls (4, 5) protruding from the floor (3) and being disposed opposite of one another, a cover plate (2) which can be fastened to the floor element (1) and which is light-transmissive and diffusely scatters impinging light, with the space delimited by the floor (3), the side walls (4, 5) and the cover plate (2) being filled with air, and LEDs (10), characterized in that a strip (8) is fastened to each of the two side walls (4, 5), which strip is inclined relative to the side wall (4, 5) under a predetermined angle (α), that the LEDs (10) are attached to the side of the strip (8) facing the floor (3) and illuminate the floor (3), with the reflective properties of the floor (3) being different in the region of the middle between the two side walls (4, 5) than close to the two side walls (4, 5).
  2. Light module according to claim 1, characterized in that the floor (3) can be subdivided into first partial areas (19) and second partial areas (20) which have different reflective properties, and that the area covered by the first partial areas (19), in comparison with the area covered by the second partial areas (20), increases with increasing distance from the respective side wall (4, 5) in a region disposed between the first side wall (4) and the middle between the two side walls (4, 5) and a region disposed between the second side wall (5) and the middle between the two side walls (4, 5).
  3. Light module according to claim 2, characterized in that the first partial areas (19) reflect the impinging light in a non-diffuse manner and that the second partial areas (20) reflect impinging light in a diffuse manner.
  4. Light module according to claim 3, characterized in that the first partial areas (19) have a reflecting surface and the second partial areas (20) have a matt white surface.
  5. Light module according to claim 2, characterized in that the first partial areas (19) have a reflectivity R1 and the second partial areas (20) a reflectivity R2, with the reflectivity R1 being larger than the reflectivity R2.
  6. Light module according to any of claims 1 to 5, characterized in that the light module comprises two further side walls (6, 7) and that the two outermost LEDs (10) of a strip (8) are arranged at a predetermined minimum distance (A) from the further side walls (6, 7).
  7. Light module according to any of claims 1 to 5, characterized in that the light module comprises two further side walls (6, 7), the absorptive power of which for light on the side facing the floor (3) is so large that the cover plate (2) appears evenly bright to the human eye.
  8. Light module according to any of claims 1 to 5, characterized in that the light module comprises two further side walls (6, 7) whose side facing the floor (3) has a matt white surface.
EP07820736A 2006-10-02 2007-10-01 Led light module having a reflector Not-in-force EP2076897B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH15682006 2006-10-02
CH2112006 2006-12-21
PCT/EP2007/060350 WO2008040690A1 (en) 2006-10-02 2007-10-01 Led light module having a reflector

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EP2076897A1 EP2076897A1 (en) 2009-07-08
EP2076897B1 true EP2076897B1 (en) 2011-02-16

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EP (1) EP2076897B1 (en)
AT (1) ATE498882T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104614A1 (en) 2017-03-06 2018-09-06 HELLA GmbH & Co. KGaA Lighting fixture for a motor vehicle, system and method for producing a lighting fixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017104614A1 (en) 2017-03-06 2018-09-06 HELLA GmbH & Co. KGaA Lighting fixture for a motor vehicle, system and method for producing a lighting fixture

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EP2076897A1 (en) 2009-07-08
ATE498882T1 (en) 2011-03-15

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