EP2076897A1 - Led light module having a reflector - Google Patents

Led light module having a reflector

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Publication number
EP2076897A1
EP2076897A1 EP07820736A EP07820736A EP2076897A1 EP 2076897 A1 EP2076897 A1 EP 2076897A1 EP 07820736 A EP07820736 A EP 07820736A EP 07820736 A EP07820736 A EP 07820736A EP 2076897 A1 EP2076897 A1 EP 2076897A1
Authority
EP
European Patent Office
Prior art keywords
side walls
light module
light
partial surfaces
module according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07820736A
Other languages
German (de)
French (fr)
Other versions
EP2076897B1 (en
Inventor
Martin Michel
Mathias Benz
Alex Janutin
Urs A. Weidmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innoled AG
Original Assignee
Innoled AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Innoled AG filed Critical Innoled AG
Priority claimed from PCT/EP2007/060350 external-priority patent/WO2008040690A1/en
Publication of EP2076897A1 publication Critical patent/EP2076897A1/en
Application granted granted Critical
Publication of EP2076897B1 publication Critical patent/EP2076897B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Definitions

  • 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 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 increases in a certain area compared to the area occupied by the second partial areas with increasing distance from the side wall to the center between the side walls.
  • the first partial surfaces differ from the second partial surfaces in the reflection characteristic: the first partial surfaces diffuse the light non-diffusely, whereas the second partial surfaces scatter the light diffusely in comparison thereto.
  • 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 Ri of the first partial areas being greater than the reflectivity R 2 of the second partial areas.
  • FIG. 2 shows the bottom element with the cover plate of the light module applied in a section along the line II of FIGS. 1, 3, 5 illustrate possibilities for locally changing the reflectivity of the bottom of the floor element by means of a structured reflection layer, and FIG Details of the invention with reference to a section of Fig. 3rd
  • the light module according to the invention comprises a bottom element and a cover plate that can be detachably fastened to the bottom element.
  • Fig. 1 shows the bottom element 1 in plan view.
  • 2 shows the bottom element 1 with the cover plate 2 in a section along the line II of FIG. 1.
  • the bottom element 1 consists of a bottom 3 and at least two opposing side walls 4 and 5 projecting from the bottom 3.
  • the bottom element 1 contains four side walls 4 to 7, which form a peripheral wall.
  • the bar 8 is inclined relative to the side wall 4 and 5 at a predetermined angle ⁇ .
  • On the bottom 3 side facing the strip 8 strips 9 are mounted with light emitting diodes 10 (LED).
  • LED light emitting diodes
  • strips 9 are commercially available in many designs.
  • the strips 9 comprise, for example, LED's 10 arranged in a row, all of which emit white light, or LED's 10 according to the RGB standard, from which every third red light, green light or blue light alternately emits light.
  • a control unit controls the LED 's 10. If red, green and blue LED's 10 are present, then the controller can drive the LED's 10 so that the light module illuminates 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 arrows 13 of equal length illustrate the uniformity of the light radiation of the light emitted by the cover plate 2.
  • the bottom 3 of the bottom element 1 advantageously has a surface that is as white and as matt as possible, which diffuses 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 therefore divided into at least a first partial surface made of high-gloss aluminum and second partial surfaces with a matt, white surface.
  • the color of the white surface is, for example, what is known as the whitest white, "traffic white 9016.”
  • 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 absorbs only a very small portion of the incident light
  • the reflection layer reflects the incident light non-diffusely, since both the first and the second sub-areas have a high reflectivity, resulting in a high luminous efficacy.
  • the subdivision of the surface of the bottom 3 into first and second sub-areas with different reflection characteristics, namely diffuse reflection and non-diffuse reflection causes the edge of the cover plate 2 appears as bright as the middle parts of the cover plate second
  • 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.
  • Fig. 3 shows the bottom 3 and the side walls 4 to 7 in plan view.
  • 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 subregions, which are located on the left and right of the first area 14 in FIG. 3).
  • the first region 14 of the bottom 3 is covered with a reflection layer 16.
  • FIG. 4 shows the region C bounded by a dashed line in FIG. 3 in order 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.
  • the surface occupied by the first partial surfaces 19 increases in the area of the saw tooth with increasing distance from the side wall 4 in comparison to the surface occupied by the second partial surfaces 20.
  • 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.
  • 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 light emitted by the LED's 10, the light on the first Area 14, as reflected by a mirror, and that light emitted by the LED's 10, that on the second area
  • 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 two outermost LEDs 10 of a strip 8 are arranged at a predetermined minimum distance A (FIG. 1) to the adjacent side wall 6 or 7, so that no or almost no light emitted directly by the LED's 10 impinges on the side walls 6 and 7 ,
  • A predetermined minimum distance
  • the LEDs 10.1, 1 and 10.1, n in the other strip 8, the LEDs 10.2, 1 and 10.2, n.
  • 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.
  • the sidewalls 6 and 7 may alternatively also be made with a very white and matt surface to diffuse the incident light, i. spread as wide as possible.
  • the light module according to the invention ensures uniform brightness distribution over the entire, diffusely scattering, translucent cover plate 2.

Landscapes

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

LED-Lichtmodul mit Reflektor LED light module with reflector
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.
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 Ri 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 increases in a certain area compared to the area occupied by the second partial areas with increasing distance from the side wall to the center between the side walls. In a preferred embodiment, the first partial surfaces differ from the second partial surfaces in the reflection characteristic: the first partial surfaces diffuse the light non-diffusely, whereas the second partial surfaces scatter the light diffusely in comparison thereto. 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 Ri 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.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 zeigt in Aufsicht ein Bodenelement eines Lichtmoduls,1 shows in plan view a bottom element of a light module,
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.FIG. 2 shows the bottom element with the cover plate of the light module applied in a section along the line II of FIGS. 1, 3, 5 illustrate possibilities for locally changing the reflectivity of the bottom of the floor element by means of a structured reflection layer, and FIG Details of the invention with reference to a section of Fig. 3rd
Das erfmdungsgemässe 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 bottom element and a cover plate that can be detachably fastened to the bottom element. Fig. 1 shows the bottom element 1 in plan view. 2 shows the bottom element 1 with the cover plate 2 in a section along the line II of FIG. 1. The bottom element 1 consists of a bottom 3 and at least two opposing side walls 4 and 5 projecting from the bottom 3. In many applications However, the bottom 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 comprise, for example, LED's 10 arranged in a row, all of which emit white light, or LED's 10 according to the RGB standard, from which every third red light, green light or blue light alternately emits light. A control unit controls the LED 's 10. If red, green and blue LED's 10 are present, then the controller can drive the LED's 10 so that the light module illuminates 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 FIG. 2, the arrows 13 of equal length illustrate the uniformity of the light radiation of the light emitted by the cover plate 2.
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 „verkehrsweiss 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 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 therefore divided into at least a first partial surface made of high-gloss aluminum and second partial surfaces with a matt, white surface. The color of the white surface is, for example, what is known as the whitest white, "traffic white 9016." 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 absorbs only a very small portion of the incident light On the other hand, the reflection layer reflects the incident light non-diffusely, since both the first and the second sub-areas have a high reflectivity, resulting in a high luminous efficacy.The subdivision of the surface of the bottom 3 into first and second sub-areas with different reflection characteristics, namely diffuse reflection and non-diffuse reflection, causes the edge of the cover plate 2 appears as bright as the middle parts of the cover plate second
Eine andere Lösung besteht darin, den Boden 3 in erste und zweite Teilflächen zu unterteilen, die sich im Reflexionsvermögen unterscheiden, wobei das Reflexionsvermögen Ri 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 subareas which differ in their reflectivity, the reflectivity Ri of the first subareas being greater than the reflectivity R 2 of the second subareas. 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 GebietsFig. 3 shows the bottom 3 and the side walls 4 to 7 in plan view. 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 subregions, which are located on the left and right of the first area 14 in FIG. 3). The first region 14 of the bottom 3 is covered with a reflection layer 16. The edge 17 of the first area
14 ist auf der der Seitenwand 4 und auf der der Seitenwand 5 zugewandten Seite sägezahnförmig ausgebildet.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.FIG. 4 shows the region C bounded by a dashed line in FIG. 3 in order 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. As can be easily seen from FIG. 4, the surface occupied by the first partial surfaces 19 increases in the area of the saw tooth with increasing distance from the side wall 4 in comparison to the surface occupied by the second partial surfaces 20.
Ein Praxistest für ein Lichtmodul, das entsprechend einer weit verbreiteten Norm eine Grosse 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 field test for a light module having a size of 60cm * 60cm, 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 sidewalls 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 GebietIf 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 light emitted by the LED's 10, the light on the first Area 14, as reflected by a mirror, and that light emitted by the LED's 10, that on the second area
15 auftrifft, sehr breit gestreut wird. Im Bereich des Sägezahns ändert somit die Reflexionscharakteristik des Bodens 3.15 hits, is very wide scattered. 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 Grosse 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 example, shown in FIG. 5, 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: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. 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.1. The two outermost LEDs 10 of a strip 8 are arranged at a predetermined minimum distance A (FIG. 1) to the adjacent side wall 6 or 7, so that no or almost no light emitted directly by the LED's 10 impinges on the side walls 6 and 7 , In the example shown in FIG. 1, in the case of one strip 8, the LEDs 10.1, 1 and 10.1, n, in the other strip 8, the LEDs 10.2, 1 and 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.2. 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.
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.2 B. The sidewalls 6 and 7 may alternatively also be made with a very white and matt surface to diffuse the incident light, i. spread as wide 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 erfmdungsgemässe 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

PATENTANSPRÜCHE
1. Lichtmodul, mit einem Bodenelement (1), das einen Boden (3) und zwei vom Boden (3) abstehende, einander gegenüberliegende Seitenwände (4, 5) aufweist, und einer am Bodenelement (1) befestigbaren Abdeckplatte (2), die lichtdurchlässig ist und auftreffendes Licht diffus streut, wobei der durch den Boden, die Seitenwände und die Abdeckplatte begrenzte Raum mit Luft gefüllt ist, dadurch gekennzeichnet, dass an jeder der beiden Seitenwände (4, 5) eine Leiste (8) befestigt ist, die gegenüber der Seitenwand (4, 5) unter einem vorbestimmten Winkel (α) geneigt ist, dass auf der dem Boden (3) zugewandten Seite der Leiste (8) LED's (10) angebracht sind, die den Boden (3) beleuchten, und dass der Boden (3) lichtreflektierend ausgebildet ist, wobei die Reflexionseigenschaften des Bodens (3) im Bereich der Mitte zwischen den beiden Seitenwänden (4, 5) anders sind als in der Nähe der beiden Seitenwände (4, 5).1. Light module, with a bottom element (1) having a bottom (3) and two from the bottom (3) projecting, opposing side walls (4, 5), and one on the bottom element (1) attachable cover plate (2), the is translucent and diffuses incident light diffusely, the space bounded by the floor, the side walls and the cover space being filled with air, characterized in that on each of the two side walls (4, 5) is fixed a bar (8) facing the side wall (4, 5) at a predetermined angle (α) is inclined, that on the bottom (3) facing side of the strip (8) LED's (10) are mounted, which illuminate the bottom (3), and that Floor (3) is designed to reflect light, wherein the reflection properties of the bottom (3) in the region of the middle between the two side walls (4, 5) are different than in the vicinity of the two side walls (4, 5).
2. Lichtmodul nach Anspruch 1, dadurch gekennzeichnet, dass der Boden (3) in erste Teilflächen (19) und zweite Teilflächen (20) unterteilbar ist, die unterschiedliche Reflexionseigenschaften haben, und dass die von den ersten Teilflächen (19) belegte Fläche im Vergleich zu der von den zweiten Teilflächen (20) belegten Fläche in einem zwischen der ersten Seitenwand (4) und der Mitte zwischen den beiden Seitenwänden (4, 5) liegenden Gebiet und einem zwischen der zweiten Seitenwand (5) und der Mitte zwischen den beiden Seitenwänden (4, 5) liegenden Gebiet mit zunehmendem Abstand von der entsprechenden Seitenwand (4, 5) zunimmt.2. Light module according to claim 1, characterized in that the bottom (3) in first partial surfaces (19) and second partial surfaces (20) is subdivided, which have different reflective properties, and that of the first partial surfaces (19) occupied area in comparison to the area occupied by the second sub-areas (20) in an area between the first side wall (4) and the middle between the two side walls (4, 5) and between the second side wall (5) and the middle between the two side walls (4, 5) increases with increasing distance from the corresponding side wall (4, 5).
3. Lichtmodul nach Anspruch 2, dadurch gekennzeichnet, dass die ersten Teilflächen (19) auftreffendes Licht nicht-diffus reflektieren und dass die zweiten Teilflächen (20) auftreffendes Licht diffus reflektieren.3. Light module according to claim 2, characterized in that the first partial surfaces (19) reflect incident light non-diffusely and that the second partial surfaces (20) diffuse incident light diffusely.
4. Lichtmodul nach Anspruch 3, dadurch gekennzeichnet, dass die ersten Teilflächen (19) eine spiegelnde Oberfläche und die zweiten Teilflächen (20) eine matte, weisse Oberfläche aufweisen.4. Light module according to claim 3, characterized in that the first partial surfaces (19) have a reflective surface and the second partial surfaces (20) have a matt, white surface.
5. Lichtmodul nach Anspruch 2, dadurch gekennzeichnet, dass die ersten Teilflächen (19) ein Reflexionsvermögen Ri und die zweiten Teilflächen (20) ein Reflexionsvermögen R2 aufweisen, wobei das Reflexionsvermögen Ri grösser als das Reflexionsvermögen R2 ist.5. Light module according to claim 2, characterized in that the first partial surfaces (19) have a reflectance Ri and the second partial surfaces (20) have a reflectance R 2 , wherein the reflectance Ri is greater than the reflectance R 2 .
6. Lichtmodul nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Lichtmodul zwei weitere Seitenwände (6, 7) aufweist und dass die beiden äussersten LED's (10) einer Leiste (8) in einem vorbestimmten Mindestabstand (A) zu den weiteren Seitenwänden (6, 7) angeordnet sind.6. Light module according to one of claims 1 to 5, characterized in that the light module has two further side walls (6, 7) and that the two outermost LEDs (10) of a bar (8) in a predetermined minimum distance (A) to the other Side walls (6, 7) are arranged.
7. Lichtmodul nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Lichtmodul zwei weitere Seitenwände (6, 7) aufweist, deren Absorptionsvermögen für Licht auf der dem Boden (3) zugewandten Seite so gross ist, dass die Abdeckplatte (2) dem menschlichen Auge gleichmässig hell erscheint. 7. Light module according to one of claims 1 to 5, characterized in that the light module has two further side walls (6, 7) whose absorption capacity for light on the bottom (3) facing side is so large that the cover plate (2) appears uniformly bright to the human eye.
8. Lichtmodul nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Lichtmodul zwei weitere Seitenwände (6, 7) aufweist, deren dem Boden (3) zugewandte Seite eine matte, weisse Oberfläche hat. 8. Light module according to one of claims 1 to 5, characterized in that the light module has two further side walls (6, 7), whose bottom (3) facing side has a matte, white surface.
EP07820736A 2006-10-02 2007-10-01 Led light module having a reflector Not-in-force EP2076897B1 (en)

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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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