EP2166276A1 - Assembly for creating an elongate light source - Google Patents

Assembly for creating an elongate light source Download PDF

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Publication number
EP2166276A1
EP2166276A1 EP09170412A EP09170412A EP2166276A1 EP 2166276 A1 EP2166276 A1 EP 2166276A1 EP 09170412 A EP09170412 A EP 09170412A EP 09170412 A EP09170412 A EP 09170412A EP 2166276 A1 EP2166276 A1 EP 2166276A1
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EP
European Patent Office
Prior art keywords
light
arrangement according
light sources
emitting element
individual
Prior art date
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Granted
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EP09170412A
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German (de)
French (fr)
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EP2166276B1 (en
Inventor
Patrik Gassner
Georg Hobelsberger
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Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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Publication of EP2166276A1 publication Critical patent/EP2166276A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/043—Refractors for light sources of lens shape the lens having cylindrical faces, e.g. rod lenses, toric lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • F21V15/013—Housings, e.g. material or assembling of housing parts the housing being an extrusion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F21Y2113/17—Combination of light sources of different colours comprising an assembly of point-like light sources forming a single encapsulated light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • a so-called lenticular sheet can preferably be arranged between the individual light sources and the light mixing chamber, which has successively arranged, transversely oriented, lens-like protrusions for widening the light of the individual light sources in the longitudinal direction. This measure additionally improves the homogeneity of the light output over the entire length of the arrangement.
  • the lenticular sheet can be slightly curved in the transverse direction, whereby the effect of the light mixing chamber is additionally improved.
  • the Perldiffusors 21 joins the actual lens area 22, which is designed sickle-shaped and the exiting light influenced such that this - as in FIG. 1 shown - is delivered in a predetermined angular range A.
  • the lens shape can be selected depending on the desired Abstrahlkegel in a suitable manner.

Abstract

The arrangement has a set of punctiform individual-light sources (4) i.e. LEDs, arranged one behind the other in a longitudinal direction. A transparent light delivery element (20) is arranged before the light sources, and is viewed in a direction of beam. A light mixing unit comprises a light mixing chamber (6) in form of an elongated hollow space, where the chamber extends itself from the light sources to the delivery element. Side walls (9) of the space are designed in a diffuse reflective manner. A lenticular foil (5) is arranged between the light sources and the chamber.

Description

Die vorliegende Erfindung betrifft eine Anordnung zur Bildung einer länglichen Lichtquelle, welche mehrere in Längsrichtung hintereinander angeordnete, im Wesentlichen punktförmige Einzel-Lichtquellen aufweist. Bei diesen Einzel-Lichtquellen kann es sich insbesondere um LEDs handeln.The present invention relates to an arrangement for forming an elongate light source, which has a plurality of substantially point-shaped individual light sources arranged one behind the other in the longitudinal direction. These individual light sources may in particular be LEDs.

In der modernen Beleuchtungstechnologie finden Lichtquellen auf Halbleiterbasis, insbesondere LEDs zunehmend Verwendung. Da sie hinsichtlich ihrer Energieeffizienz sowie der Möglichkeiten, sie anzusteuern, deutliche Vorteile gegenüber klassischen Lichtquellen aufweisen, lösen LEDs Gasentladungslampen oder klassische Glühbirnen im zunehmenden Maße ab. Ein Nachteil von LEDs besteht allerdings darin, dass es sich hierbei um im Wesentlichen punktförmige Lichtquellen handelt, während hingegen in der Beleuchtungstechnologie oftmals eine homogene Lichtabgabe über eine gewisse Länge hinweg oder sogar über eine Fläche hinweg gewünscht ist. Mit Hilfe optischer Elemente wird deshalb versucht, das von den einzelnen LEDs abgegebene Licht derart zu beeinflussen, dass eine gleichmäßige Lichtabgabe erzielt wird.In modern lighting technology semiconductor light sources, in particular LEDs, are increasingly being used. As they offer significant advantages over classic light sources in terms of energy efficiency and the possibilities to control them, LEDs are increasingly replacing gas discharge lamps or classic light bulbs. A disadvantage of LEDs, however, is that these are essentially punctiform light sources, whereas in lighting technology, in contrast, a homogeneous light output over a certain length or even across a surface is often desired. With the help of optical elements is therefore trying to influence the light emitted by the individual LEDs so that a uniform light output is achieved.

Hierzu sind aus dem Stand der Technik verschiedenste Möglichkeiten bekannt, wobei diese Lösungen allerdings teilweise recht aufwändig sind und/oder verhältnismäßig viel Platz in Anspruch nehmen. Hierdurch werden aber die bei der Verwendung von LEDs erzielten Vorteile wiederum teilweise aufgehoben, weshalb der vorliegenden Erfindung die Aufgabe zu Grunde liegt, eine Möglichkeit zur Verfügung zu stellen, unter Verwendung von punktförmigen Lichtquellen, insbesondere von LEDs, eine möglichst homogene längliche Lichtquelle zu bilden.For this purpose, various options are known from the prior art, but these solutions are sometimes quite expensive and / or take up relatively much space. As a result, however, the advantages achieved with the use of LEDs are in turn partially removed, which is why the present invention is based on the object to provide a way to use punctiform light sources, in particular of LEDs, to form a homogeneous homogeneous elongated light source.

Die Aufgabe wird durch eine Anordnung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.The object is achieved by an arrangement having the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

Erfindungsgemäß wird dementsprechend eine Anordnung zur Bildung einer länglichen Lichtquelle vorgeschlagen, welche aufweist: mehrere in Längsrichtung hintereinander angeordnete, im Wesentlichen punktförmige Einzel-Lichtquellen, insbesondere LEDs, ein - in Abstrahlrichtung gesehen - vor den Einzel-Lichtquellen angeordnetes transparentes Lichtabgabeelement, sowie zwischen den Einzel-Lichtquellen und dem Lichtabgabeelement angeordnete Mittel zur Lichtmischung, wobei die Mittel zur Lichtmischung eine sich von den Einzel-Lichtquellen zu dem Lichtabgabeelement erstreckende Lichtmischkammer in Form eines länglichen Hohlraums umfassen, dessen Seitenwände diffus reflektierend ausgebildet sind.Accordingly, an arrangement for forming an elongate light source is proposed according to the invention, which comprises a plurality of substantially point-shaped individual light sources, in particular LEDs, arranged one behind the other in the longitudinal direction and arranged in front of the individual light sources transparent light emitting element, as well as arranged between the individual light sources and the light emitting element means for light mixing, wherein the means for light mixing comprise a light from the individual light sources to the light emitting element extending light mixing chamber in the form of an elongated cavity whose side walls are formed diffusely reflective.

Die erfindungsgemäße Anordnung zeichnet sich durch Ihren verhältnismäßig einfachen und platzsparenden Aufbau aus. Es hat sich gezeigt, dass durch den Einsatz der Lichtmischkammer das von den LEDs stammende Licht sehr homogen verteilt werden kann, sodass letztendlich eine längliche homogene Lichtquelle geschaffen wird.The arrangement according to the invention is characterized by its relatively simple and space-saving design. It has been found that by using the light mixing chamber, the light originating from the LEDs can be distributed very homogeneously, so that ultimately an elongate homogeneous light source is created.

Dabei kann vorzugsweise zwischen den Einzel-Lichtquellen und der Lichtmischkammer eine sog. Lentikularfolie angeordnet sein, welche hintereinander angeordnete und in Querrichtung orientierte, linsenartige Vorwölbungen zur Aufweitung des Lichts der Einzel-Lichtquellen in Längsrichtung aufweist. Durch diese Maßnahme wird die Homogenität der Lichtabgabe über die gesamte Länge der Anordnung hinweg zusätzlich verbessert. Dabei kann die Lentikularfolie in Querrichtung leicht gewölbt sein, wodurch die Wirkung der Lichtmischkammer zusätzlich verbessert wird.In this case, a so-called lenticular sheet can preferably be arranged between the individual light sources and the light mixing chamber, which has successively arranged, transversely oriented, lens-like protrusions for widening the light of the individual light sources in the longitudinal direction. This measure additionally improves the homogeneity of the light output over the entire length of the arrangement. In this case, the lenticular sheet can be slightly curved in the transverse direction, whereby the effect of the light mixing chamber is additionally improved.

Auch zwischen der Lichtmischkammer und dem Lichtabgabeelement kann eine weitere Lentikularfolie angeordnet sein, um die Homogenität nochmals zusätzlich zu verbessern.A further lenticular foil may also be arranged between the light mixing chamber and the light-emitting element, in order to additionally improve the homogeneity.

Das Lichtabgabeelement selbst kann je nach Art und Weise, in der die Lichtabgabe letztendlich gewünscht ist, ausgebildet sein. Ist allerdings vorgesehen, dass das von der Lichtquelle abgegebene Licht nur in einem bestimmten Winkelbereich abgestrahlt werden soll, so kann das Lichtabgabeelement insbesondere durch einen länglichen Stab gebildet sein, der im Querschnitt linsenförmig ausgebildet ist. Dabei kann dieser Stab insbesondere zweiteilig ausgebildet sein und einen ersten, lichtstreuenden Bereich sowie einen zweiten, lichtbündelnden Bereich aufweisen. Beide Bereiche können einstückig miteinander verbunden und beispielsweise in einem Koextrusionsverfahren hergestellt sein. Es wäre allerdings auch möglich, beide Bereiche durch einen Spalt von einander optisch zu trennen. Hierdurch ist sichergestellt, dass die Wirkung des zweiten, lichbündelnden Bereichs durch den ersten, lichtstreuenden Bereich nicht negativ beeinträchtigt wird.The light emitting element itself may be formed depending on the manner in which the light output is ultimately desired. However, if provision is made for the light emitted by the light source to be emitted only in a certain angular range, then the light-emitting element can be formed, in particular, by an elongate rod which is of lenticular design in cross-section. In this case, this rod may in particular be designed in two parts and have a first, light-scattering region and a second, light-bundling region. Both regions can be integrally connected to one another and produced, for example, in a coextrusion process. However, it would also be possible to visually separate both areas by a gap of each other. This ensures that the effect of the second, Lich bundling area is not adversely affected by the first light-scattering area.

Die Höhe der Lichtmischkammer kann in etwa 20 mm betragen, was einerseits zu einer hinsichtlich ihrer Bauweise kompakten Anordnung führt, andererseits für eine zufriedenstellende Lichtmischung ausreichend ist. Die einzelnen Komponenten der Anordnung können dabei durch einen länglichen Profilkörper gehalten sein, sodass letztendlich eine äußerst einfach zu handhabende Lichtquelle mit hervorragenden optischen Eigenschaften gebildet ist.The height of the light mixing chamber can be about 20 mm, which on the one hand leads to a compact construction in terms of their construction, on the other hand is sufficient for a satisfactory light mixture. The individual components of the arrangement can be held by an elongate profile body, so that ultimately an extremely easy-to-use light source with excellent optical properties is formed.

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

  • Figur 1 ein erstes Ausführungsbeispiel einer erfindungsgemäßen Lichtquelle in Schnittdarstellung;
  • Figuren 2a und 2b Ansichten des bei der erfindungsgemäßen Lichtquelle verwendeten Lichtabgabeelements und
  • Figur 3 ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Lichtquelle.
The invention will be explained in more detail with reference to the accompanying drawings. Show it:
  • FIG. 1 a first embodiment of a light source according to the invention in sectional view;
  • FIGS. 2a and 2b Views of the light emitting element used in the light source according to the invention and
  • FIG. 3 a further embodiment of a light source according to the invention.

Die in Figur 1 allgemein mit dem Bezugszeichen 1 versehene erfindungsgemäße längliche Lichtquelle weist als zentrales Halterungselement ein längliches Aluminiumprofil 2 auf, welches einerseits der Halterung sämtlicher Komponenten der Lichtquelle 1 dient und andererseits zur Montage an einer Tragvorrichtung vorgesehen ist. Im dargestellten Ausführungsbeispiel ist das Aluminiumprofil im Querschnitt gesehen trapezförmig ausgestaltet, wobei allerdings selbstverständlich auch andere Querschnittsformen denkbar wären.In the FIG. 1 generally provided with the reference numeral 1 inventive elongated light source has as a central support member on an elongate aluminum profile 2, which serves on the one hand the holder of all components of the light source 1 and on the other hand is provided for mounting on a support device. In the illustrated embodiment, the aluminum profile seen in cross-section is designed trapezoidal, although of course other cross-sectional shapes would be conceivable.

Im rückwärtigen Bereich des Aufnahmeraums des Aluminiumprofils 2 sind eine oder mehrere längliche Platinen 3 angeordnet, auf der bzw. denen eine Vielzahl von LEDs 4 in Längsrichtung hintereinander angeordnet sind. Vorzugsweise sind die LEDs 4 ungehäust (sog. Chip-on-board) auf der Platine 3 montiert, da hierdurch eine besonders kompakte Bauform bei gleichzeitig äußerst effizienter Lichtabgabe erzielt werden kann. Die LEDs können alle Licht der gleichen Farbe abgeben oder auch verschiedenfarbig sein, um letztendlich ein Mischlicht in einem gewünschten Farbton abgeben zu können. Auch der Einsatz von in ihrer Farbei nahezu beliebig veränderbaren RGB-LEDs wäre denkbar.In the rear region of the receiving space of the aluminum profile 2, one or more elongated boards 3 are arranged, on which or a plurality of LEDs 4 are arranged one behind the other in the longitudinal direction. Preferably, the LEDs 4 are unhoused (so-called chip-on-board) mounted on the board 3, as this a particularly compact design can be achieved at the same time extremely efficient light output. The LEDs can all deliver light of the same color or be different colors, in order to finally be able to deliver a mixed light in a desired color. The use of RGB LEDs which can be changed almost arbitrarily in their colors would also be conceivable.

Das von diesen vielen LEDs 4 abgegebene Licht soll letztendlich an der Unterseite des Aluminiumprofils 2 gleichmäßig über dessen gesamte Länge abgegeben werden. Als Lichtabgabeelement dient hierzu ein länglicher Linsenstab 20, dessen Ausgestaltung zu einem späteren Zeitpunkt noch näher erläutert werden soll. Mit Hilfe mehrerer, nachfolgend beschriebener optischer Mittel, die zwischen den LEDs 4 und dem Linsenstab 20 angeordnet sind, wird bewirkt, dass das von den Einzel-Lichtquellen abgegebene Licht derart homogen vermischt wird, dass eine gleichmäßige Lichtabgabe über die gesamte Länge des Linsenstabs 20 erzielt wird.The light emitted by these many LEDs 4 light is ultimately delivered to the bottom of the aluminum profile 2 evenly over its entire length. The light-emitting element used for this purpose is an elongated lens rod 20, whose configuration will be explained in more detail later. By means of a plurality of optical means, described below, which are arranged between the LEDs 4 and the lens rod 20, the light emitted by the individual light sources is caused to mix homogeneously so as to obtain a uniform light output over the entire length of the lens rod 20 becomes.

Ein erstes Lichtbeeinflussungselement wird hierbei durch eine längliche Lentikularfolie 5 gebildet, welche mit ihren Längsseiten in entsprechende Ausnehmungen 5a des Aluminiumprofils 2 eingeklemmt und hierdurch leicht gewölbt ist. In Längsrichtung gesehen weist die Lentikularfolie 5 regelmäßig angeordnete, linsenartige Vorsprünge auf. Diese Vorsprünge bewirken eine Aufweitung des von den LEDs 4 abgegebenen Lichts in Längsrichtung der Anordnung, sodass hierdurch also eine erste Vermischung erzielt wird.A first light-influencing element is in this case formed by an elongated lenticular sheet 5, which is clamped with its longitudinal sides into corresponding recesses 5a of the aluminum profile 2 and thus slightly curved. Seen in the longitudinal direction, the lenticular sheet 5 regularly arranged, lens-like projections. These projections cause a widening of the light emitted by the LEDs 4 in the longitudinal direction of the arrangement, so that in this way therefore a first mixing is achieved.

Das auf diese Weise aufgeweitete Licht der LEDs 4 wird dann in eine Lichtmischkammer 6 eingekoppelt, welche durch zwei längliche Reflektorteile 7 gebildet ist. Diese Reflektorteile 7 weisen seitliche Arme 8 auf, mit deren Hilfe sie in entsprechende Ausnehmungen 8a des Aluminiumprofils 2 eingeklemmt werden. Für die Vermischung des LED-Lichts hauptsächlich verantwortet hingegen sind zwei im Wesentlichen in Lichtabstrahlrichtung ausgerichtete seitliche Reflektorwände 9, welche sich von der Lentikularfolie 5 zur Unterseite der Anordnung erstrecken. Diese Reflektorwände 9 begrenzen an ihrer Oberseite eine längliche Einstrahlöffnung für die Lichtmischkammer 6 in die das LED-Licht nach Durchtreten der Lentikularfolie 5 eingestrahlt wird. Die Seitenwände 9 der Lichtmischkammer 6 sind hierbei vorzugsweise diffus reflektierend ausgebildet, wodurch die Lichtstrahlen insbesondere auch in Längsrichtung der Anordnung gesehen nochmals weiter verteilt und dementsprechend vermischt werden. Die Höhe der im Querschnitt trapezförmig ausgebildeten Lichtkammer beträgt mindestens etwa 20 mm, was für eine zufriedenstellende Lichtmischung ausreichend ist, gleichzeitig allerdings auch zu einer sehr kompakten Anordnung der gesamten Lichtquelle führt. Dabei könnte alternativ zu der Trapezform die Lichtmischkammer im Schnitt auch quadratisch oder rechteckig ausgebildet sein.The light of the LEDs 4 expanded in this way is then coupled into a light mixing chamber 6, which is formed by two elongated reflector parts 7. These reflector parts 7 have lateral arms 8, by means of which they are clamped into corresponding recesses 8a of the aluminum profile 2. For the mixing of the LED light mainly responsible, however, are two substantially aligned in the light emission direction side reflector walls 9, which extend from the lenticular sheet 5 to the bottom of the assembly. These reflector walls 9 define on their upper side an elongated injection opening for the light mixing chamber 6 into which the LED light is irradiated after passage of the lenticular sheet 5. In this case, the side walls 9 of the light mixing chamber 6 are preferably designed to be diffusely reflective, as a result of which the light beams, particularly as seen in the longitudinal direction of the arrangement, are further distributed and mixed accordingly. The height of the cross-section trapezoidal light chamber is at least about 20 mm, which is sufficient for a satisfactory light mixture, but at the same time also leads to a very compact arrangement of the entire light source. In this case, as an alternative to the trapezoidal shape, the light mixing chamber could also be square or rectangular in section.

Die Unterseite der Lichtmischkammer 6 wird dann durch eine weitere Lentikularfolie 10 begrenzt, die ebenso wie die bereits vorgeschriebene Lentikularfolie 5 ausgestaltet ist, also wiederum in Längsrichtung gesehen periodisch angeordnete Vorwölbungen zur weiteren Aufweitung der Lichtbündel aufweist.The underside of the light mixing chamber 6 is then delimited by a further lenticular sheet 10, which is designed in the same way as the already prescribed lenticular sheet 5, ie in turn has periodically arranged protrusions in the longitudinal direction for further expansion of the light bundles.

Das auf diese Weise beeinflusste Licht wird dann über den Linsenstab 20 abgestrahlt, wobei dieser - wie in den Figuren 2a und 2b dargestellt - zweiteilig ausgestaltet ist. Ein oberer, der Lichtmischkammer 6 zugewandter Bereich dient hierbei zu einer weiteren Vermischung des Lichts und besteht dementsprechend aus einem lichtstreuenden Material, es kann sich hierbei insbesondere um einen länglichen, leicht gewölbten Perldiffusor handeln.The light influenced in this way is then emitted via the lens rod 20, this - as in the FIGS. 2a and 2b shown - is designed in two parts. An upper region facing the light mixing chamber 6 serves to further mix the light and accordingly consists of a light-scattering material, which may in particular be an elongated, slightly curved perldiffusor.

An die Unterseite des Perldiffusors 21 schließt sich dann der eigentliche Linsenbereich 22 an, der sichelförmig ausgestaltet ist und das austretende Licht derart beeinflusst, dass dieses - wie in Figur 1 dargestellt - in einen vorgegebenen Winkelbereich A abgegeben wird. Die Linsenform kann dabei je nach gewünschtem Abstrahlkegel in geeigneter Weise gewählt werden.At the bottom of the Perldiffusors 21 then joins the actual lens area 22, which is designed sickle-shaped and the exiting light influenced such that this - as in FIG. 1 shown - is delivered in a predetermined angular range A. The lens shape can be selected depending on the desired Abstrahlkegel in a suitable manner.

Die beiden Komponenten 21 und 22 des Linsenstabs 20 bestehen vorzugsweise aus einem transparenten Kunststoffmaterial, beispielsweise PMMA, wobei dem Diffusorbereich 21 lichtstreuendes Material beigemischt ist. Vorzugsweise sind hierbei beide Komponenten 21 und 22 einstückig miteinander verbunden, was beispielsweise dadurch erzielt werden kann, dass der Linsenstab 20 in einem Koextrusionsverfahren hergestellt wird. Auf diesem Wege wird in einfacher Weise ein Lichtbeeinflussungselement mit den gewünschten Eigenschaften erzielt. Alternativ hierzu bestünde allerdings auch die Möglichkeit, beide Komponenten (Diffusor und Linsenbereich) getrennt herzustellen und durch einen geringen Spalt voneinander beabstandet anzuordnen. Auf diesem Wege würde zusätzlich sichergestellt werden, dass die lichtstreuenden Eigenschaften des Diffusors 21 die lichtbündelnden Eigenschaften des Linsenbereichs 22 nicht negativ beeinflussen.The two components 21 and 22 of the lens rod 20 are preferably made of a transparent plastic material, such as PMMA, wherein the diffuser region 21 is mixed with light-scattering material. Preferably, in this case, both components 21 and 22 are integrally connected to each other, which can be achieved, for example, that the lens rod 20 is produced in a co-extrusion process. In this way, a light influencing element with the desired properties is achieved in a simple manner. Alternatively, however, it would also be possible to produce both components (diffuser and lens area) separately and to arrange them spaced apart by a small gap. In this way, it would additionally be ensured that the light-scattering properties of the diffuser 21 do not adversely affect the light-bundling properties of the lens region 22.

Letztendlich wird durch diese gesamte Anordnung also eine äußerst einfach ausgestaltete und kompakte Lichtquelle geschaffen, bei der trotz der Verwendung einzelner punkförmiger Lichtquellen eine homogene Lichtabgabe über eine bestimmte Länge hinweg erzielt wird.Ultimately, therefore, a very simply designed and compact light source is created by this entire arrangement, in spite of the use of individual punk-shaped light sources, a homogeneous light output over a certain length is achieved.

Eine alternative Ausführungsform zum Beispiel von Figur 1 ist in Figur 3 dargestellt. Hierbei sind die beiden Lentikularfolien 5 und 10 eben ausgerichtet, besitzen also in Querrichtung keine Wölbung. Trotz allem wird hier eine zufriedenstellende Mischung des von den LEDs abgestrahlten Lichts erzielt. Ferner zeigt das Ausführungsbeispiel von Figur 3 auch, dass - wie bereits zuvor erwähnt - die Querschnittsform des Aluminiumprofils variiert werden kann.An alternative embodiment for example of FIG. 1 is in FIG. 3 shown. Here, the two lenticular films 5 and 10 are aligned, so they have no curvature in the transverse direction. Despite all this, a satisfactory mix of the light emitted by the LEDs is achieved here. Furthermore, the embodiment of FIG FIG. 3 also that - as already mentioned above - the cross-sectional shape of the aluminum profile can be varied.

Claims (10)

Anordnung zur Bildung einer länglichen Lichtquelle (1), aufweisend mehrere in Längsrichtung hintereinander angeordnete, im Wesentlichen punktförmige Einzel-Lichtquellen (4), insbesondere LEDs,
ein - in Abstrahlrichtung gesehen - vor den Einzel-Lichtquellen (4) angeordnetes transparentes Lichtabgabeelement (20), sowie
zwischen den Einzel-Lichtquellen (4) und dem Lichtabgabeelement (20) angeordnete Mittel zur Lichtmischung,
wobei die Mittel zur Lichtmischung eine sich von den Einzel-Lichtquellen (4) zu dem Lichtabgabeelement (20) erstreckende Lichtmischkammer (6) in Form eines länglichen Hohlraums umfassen, dessen Seitenwände (9) diffus reflektierend ausgebildet sind.Arrangement for forming an elongated light source (1), comprising a plurality of substantially point-shaped individual light sources (4) arranged in longitudinal direction one behind the other, in particular LEDs,
a - seen in the emission direction - in front of the individual light sources (4) arranged transparent light-emitting element (20), and
between the individual light sources (4) and the light-emitting element (20) arranged light mixing means,
wherein the means for mixing the light comprises a light mixing chamber (6) extending from the individual light sources (4) to the light emitting element (20) in the form of an elongated cavity, the side walls (9) of which are diffusely reflecting. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
dass zwischen den Einzel-Lichtquellen (4) und der Lichtmischkammer (6) eine Lentikularfolie (5) angeordnet ist, welche hintereinander angeordnete und in Querrichtung orientierte, linsenartige Vorwölbungen aufweist.Arrangement according to claim 1,
characterized,
in that a lenticular sheet (5) is arranged between the individual light sources (4) and the light mixing chamber (6), which has lenticular bulges arranged one behind the other and oriented in the transverse direction. Anordnung nach Anspruch 2,
dadurch gekennzeichnet,
dass die Lentikularfolie (5) in Querrichtung leicht gewölbt ist.Arrangement according to claim 2,
characterized,
that the lenticular sheet (5) is slightly curved in the transverse direction. Anordnung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass zwischen der Lichtmischkammer (6) und dem Lichtabgabeelement (20) eine Lentikularfolie (10) angeordnet ist.Arrangement according to one of the preceding claims,
characterized,
in that a lenticular sheet (10) is arranged between the light mixing chamber (6) and the light emitting element (20). Anordnung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass das Lichtabgabeelement (20) durch einen länglichen Stab gebildet ist, der im Querschnitt gesehen linsenförmig ausgebildet ist.Arrangement according to one of the preceding claims,
characterized,
in that the light-emitting element (20) is formed by an elongate rod which, when viewed in cross-section, is lenticular. Anordnung nach Anspruch 5,
dadurch gekennzeichnet,
dass der Stab - in Lichtabstrahlrichtung gesehen - zweiteilig ausgebildet ist und einen ersten, lichtstreuenden Bereich (21) sowie einen zweiten lichtbündelnden Bereich (22) aufweist.Arrangement according to claim 5,
characterized,
that the rod - as seen in light emission direction - is formed in two parts and has a first light-scattering region (21) and a second light-bundling region (22). Anordnung nach Anspruch 6,
dadurch gekennzeichnet,
dass beide Bereiche (21, 22) einstückig miteinander verbunden sind.Arrangement according to claim 6,
characterized,
that both areas (21, 22) are integrally connected to each other. Anordnung nach Anspruch 6,
dadurch gekennzeichnet,
dass beide Bereiche (21, 22) durch einen Spalt voneinander getrennt sind.Arrangement according to claim 6,
characterized,
that both areas (21, 22) are separated by a gap. Anordnung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Höhe der Lichtmischkammer (6) mindestens 20mm beträgt.Arrangement according to one of the preceding claims,
characterized,
that the height of the light mixing chamber (6) is at least 20mm. Anordnung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die einzelnen Komponenten der Anordnung durch einen länglichen Profilkörper (2) gehalten sind.Arrangement according to one of the preceding claims,
characterized,
that the individual components of the arrangement are held by an elongated profile body (2).
EP09170412.2A 2008-09-19 2009-09-16 Assembly for creating an elongate light source Active EP2166276B1 (en)

Applications Claiming Priority (1)

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DE202008012463U DE202008012463U1 (en) 2008-09-19 2008-09-19 Arrangement for forming an elongated light source

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EP2166276A1 true EP2166276A1 (en) 2010-03-24
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DE202008012463U1 (en) 2010-02-11
EP2166276B1 (en) 2014-11-19

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