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EP2459924B1 - Lighting device with led's - Google Patents

Lighting device with led's Download PDF

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Publication number
EP2459924B1
EP2459924B1 EP10728194.1A EP10728194A EP2459924B1 EP 2459924 B1 EP2459924 B1 EP 2459924B1 EP 10728194 A EP10728194 A EP 10728194A EP 2459924 B1 EP2459924 B1 EP 2459924B1
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EP
European Patent Office
Prior art keywords
reflector
led
lighting device
tube
leds
Prior art date
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Not-in-force
Application number
EP10728194.1A
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German (de)
French (fr)
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EP2459924A1 (en
Inventor
Henning Rehn
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Osram GmbH
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Osram GmbH
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69Details of refractors forming part of the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2103/00Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Definitions

  • the invention relates to a tubular lighting device with light emitting diodes (LED: light emitting diode).
  • LED light emitting diode
  • LED is to be understood as meaning not only visible light (visible electromagnetic radiation [VIS], white or colored) but also infrared (IR) or ultraviolet (UV) radiation emitting diodes.
  • VIS visible electromagnetic radiation
  • IR infrared
  • UV ultraviolet
  • LED in elongate lighting devices as a replacement for tubular fluorescent lamps is already known from numerous publications. As an example, here are the scriptures US 2002/060526 A1 and US 2005/225979 A1 called. There, a plurality of LEDs are arranged on an elongate printed circuit board, which in turn are arranged in a transparent tube, which can be inserted into the socket of a conventional tubular fluorescent lamp. Since these LED lamps are designed for general lighting, they are not suitable for special lighting tasks that require a specific illumination intensity distribution.
  • the font DE 20 2009 003785 U1 also discloses such a lighting device, which also additionally comprises an elongated reflector of two elongated reflecting plates.
  • the basic idea of the invention is to provide, in the case of a tubular LED-based lighting device, at least one separate optical means with which a desired illumination intensity distribution, both in the direction of the longitudinal axis of the illumination device and in particular in the planes perpendicular to the longitudinal axis, can be achieved.
  • a desired illumination intensity distribution both in the direction of the longitudinal axis of the illumination device and in particular in the planes perpendicular to the longitudinal axis, can be achieved.
  • aperture lamps ie tubular lamps, for example fluorescent lamps, which radiate substantially only in a relatively narrow angular range with high light intensity.
  • the tube does not necessarily have to be straight but can, if so advantageous for the intended application, be curved.
  • the driver electronics can be arranged wholly or partially on the PCB.
  • the two ends of the tubular lighting device are suitably closed (not shown).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine rohrförmige Beleuchtungsvorrichtung mit Leuchtdioden (LED: Licht emittierende Diode) .The invention relates to a tubular lighting device with light emitting diodes (LED: light emitting diode).

Unter dem Begriff LED sind hier nicht nur sichtbares Licht (sichtbare elektromagnetische Strahlung [VIS]; weiß oder farbig) sondern auch infrarote (IR-) oder ultraviolette (UV-) Strahlung emittierende Dioden zu verstehen.The term LED is to be understood as meaning not only visible light (visible electromagnetic radiation [VIS], white or colored) but also infrared (IR) or ultraviolet (UV) radiation emitting diodes.

Stand der TechnikState of the art

Die Verwendung von LED in länglichen Beleuchtungsvorrichtungen als Ersatz für rohrförmige Leuchtstofflampen ist bereits aus zahlreichen Schriften bekannt. Beispielhaft seinen hier die Schriften US 2002/060526 A1 und US 2005/225979 A1 genannt. Dort sind mehrere LED auf einer länglichen Leiterplatte angeordnet, die wiederum in einem transparenten Rohr angeordnet sind, das in die Fassung einer herkömmlichen rohrförmigen Leuchtstofflampe eingesetzt werden kann. Da diese LED-Lampen für die Allgemeinbeleuchtung ausgelegt sind, eignen sie sich nicht für spezielle Beleuchtungsaufgaben, die eine spezifische Beleuchtungsstärkeverteilung erfordern. Die Schrift DE 20 2009 003785 U1 offenbart ebenfalls eine derartige Beleuchtungsvorrichtung, die außerdem zusätzlich einen länglichen Reflektor aus zwei länglichen reflektierenden Platten aufweist. Die beiden reflektierenden Platten sind beidseits einer Reihe aus LED so angeordnet, dass die von den LED abgestrahlten Lichtstrahlen in einen, entlang der Längsachse der rohrförmigen Lampe betrachtet, kleineren Abstrahlwinkel geformt werden. Die Schrift JP 2009 158533 A oder die Schrift DE10134975A zeigt eine rohrförmige Lampe mit einer Reihe aus LED. Zur Lichtformung ist in den der Reihe aus LED gegenüberliegenden Teil des Lampenrohrs eine zylindrische Linse integriert. Die Schrift WO 03/004930 A1 zeigt eine rohrförmige Lampe mit einer Doppelreihe aus LED.The use of LED in elongate lighting devices as a replacement for tubular fluorescent lamps is already known from numerous publications. As an example, here are the scriptures US 2002/060526 A1 and US 2005/225979 A1 called. There, a plurality of LEDs are arranged on an elongate printed circuit board, which in turn are arranged in a transparent tube, which can be inserted into the socket of a conventional tubular fluorescent lamp. Since these LED lamps are designed for general lighting, they are not suitable for special lighting tasks that require a specific illumination intensity distribution. The font DE 20 2009 003785 U1 also discloses such a lighting device, which also additionally comprises an elongated reflector of two elongated reflecting plates. The two reflecting plates are arranged on both sides of a row of LED so that the the LED radiated light beams are formed in a, along the longitudinal axis of the tubular lamp viewed, smaller radiation angle. The font JP 2009 158533 A or the writing DE10134975A shows a tubular lamp with a row of LED. For the shaping of light, a cylindrical lens is integrated in the part of the lamp tube opposite the row of LEDs. The font WO 03/004930 A1 shows a tubular lamp with a double row of LED.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung ist es, eine rohrförmige Beleuchtungsvorrichtung auf der Basis von Leuchtdioden (LED) bereitzustellen, so dass eine vorgebbare Beleuchtungsstärkeverteilung erzielt wird.The object of the present invention is a tubular lighting device based on light-emitting diodes To provide (LED), so that a predetermined illuminance distribution is achieved.

Diese Aufgabe wird gelöst durch eine Beleuchtungsvorrichtung mit einem zumindest abschnittsweise lichtdurchlässigen Rohr und mehreren Leuchtdioden (LED), wobei die LED innerhalb des Rohres nebeneinander und parallel zur Rohrlängsachse angeordnet sind, sowie mit mindestens einem separaten optischen Mittel, das innerhalb des Rohres angeordnet ist und einen länglichen Reflektor in dem die LED angeordnet sind, wobei der Reflektor für jede LED individuelle trichterartige Vertiefungen aufweist und wobei die jeweilige LED an engen Ende der zugehörigen trichterartigen Vertiefungen angeordnet ist. Besonders vorteilhafte Ausgestaltungen finden sich in den abhängigen Ansprüchen.This object is achieved by a lighting device having an at least partially translucent tube and a plurality of light-emitting diodes (LED), wherein the LEDs are arranged inside the tube next to each other and parallel to the tube longitudinal axis, and with at least one separate optical means disposed within the tube and a elongated reflector in which the LED are arranged, wherein the reflector for each LED individual funnel-like depressions and wherein the respective LED is arranged at the narrow end of the associated funnel-like depressions. Particularly advantageous embodiments can be found in the dependent claims.

Der Grundgedanke der Erfindung besteht darin, bei einer rohrförmigen Beleuchtungsvorrichtung auf LED-Basis mindestens ein separates optisches Mittel vorzusehen, mit dem eine gewünschte Beleuchtungsstärkeverteilung, sowohl in Richtung der Längsachse der Beleuchtungsvorrichtung als auch insbesondere in den Ebenen senkrecht zur Längsachse erzielt werden kann. Damit werden insbesondere auch Anwendungsgebiete erschließbar, die bisher unter anderem sogenannten Aperturlampen, also rohrförmige Lampen, beispielsweise Leuchtstofflampen, die im wesentlichen nur in einem relativ schmalen Winkelbereich mit hoher Lichtstärke abstrahlen, vorbehalten waren. Das Rohr muss übrigens nicht notwendigerweise gerade sein sondern kann, falls für die vorgesehene Anwendung vorteilhaft, auch gekrümmt sein.The basic idea of the invention is to provide, in the case of a tubular LED-based lighting device, at least one separate optical means with which a desired illumination intensity distribution, both in the direction of the longitudinal axis of the illumination device and in particular in the planes perpendicular to the longitudinal axis, can be achieved. Thus, in particular, application areas can be explored that were previously reserved, inter alia, so-called aperture lamps, ie tubular lamps, for example fluorescent lamps, which radiate substantially only in a relatively narrow angular range with high light intensity. Incidentally, the tube does not necessarily have to be straight but can, if so advantageous for the intended application, be curved.

Unter dem Begriff separates optisches Mittel sind hier ein oder mehrere optische Elemente zu verstehen, die nicht in das Gehäuse einer LED integriert sind. Gleichwohl soll die Erfindung aber auch solche Fälle umfassen, bei denen die verwendeten LED selbst bereits eine in das LED-Gehäuse integrierte Optik aufweisen. Der Begriff separates optisches Mittel umfasst erfindungsgemäß eine Zylinderlinse und einen länglichen Reflektor, die das von den LED kommende Licht bzw. all-gemein die elektromagnetische Strahlung in Hinblick auf die gewünschte Beleuchtungs- bzw. Bestrahlungsstärkeverteilung formt. Die Zylinderlinse kann einteilig sein, aber auch aus mehreren Teilen bestehen, beispielsweise bei besonders langen erfindungsgemäßen Beleuchtungsvorrichtungen.The term separate optical means is to be understood here as one or more optical elements which are not integrated in the housing of an LED. However, the invention should also include such cases, in which the LED used itself already have an integrated into the LED housing optics. The term separate optical means according to the invention comprises a cylindrical lens and an elongated reflector, which forms the light coming from the LED or generally the electromagnetic radiation with respect to the desired illumination or irradiance distribution. The cylindrical lens may be in one piece, but may also consist of several parts, for example in the case of particularly long illumination devices according to the invention.

Um auf der zu bestrahlenden Fläche bzw. dem Zielobjekt eine ausreichend hohe Bestrahlungsstärke zu erreichen, ist die Zylinderlinse als Sammellinse ausgebildet. Dabei ist zumindest die von den LED abgewandte Fläche der Zylinderlinse konvex geformt und die Krümmung dieser Fläche der Krümmung der Innenfläche der Rohrwand angepasst. Dadurch ist es möglich, dass die Zylinderlinse so angeordnet ist, dass die von den LED abgewandte Fläche der Zylinderlinse an der Innenfläche der Rohrwand anliegt. Auf diese Weise ist die Zylinderlinse besonders platzsparend innerhalb des Rohres anordnen. Optional lassen sich durch den Einsatz einer Immersion Lichtverluste im Übergang zwischen Zylinderlinse und Rohrwand minimieren. Der Querschnitt des Rohres ist vorzugsweise kreisförmig. Erfindungsgemäss ist mindestens eines der optischen Mittel einen Reflektor, in dem die LED angeordnet sind. Erfindungsgemäss weist der Reflektor für jede LED individuelle trichterartige Vertiefungen auf, wobei die jeweilige LED am engen Ende der zugehörigen trichterartigen Vertiefungen, d.h. am Reflektorboden, angeordnet ist. Der Reflektor kann ein- oder mehrteilig sein. In einer bevorzugten Ausführung ist der Reflektor mehrteilig, wobei für jede LED ein separates individuelles Reflektorelement vorgesehen ist. Dies hat neben einer effizienten Lichtsammlung und -formung den Vorteil, dass sich bei Bedarf sehr flexibel unterschiedlich lange LED-Reflektor-Module verwirklichen lassen. Dazu werden je nach benötigter Länge der Beleuchtungsvorrichtung zwei oder mehrere LED einschließlich jeweiligem Reflektorelement nebeneinander auf einem gemeinsamen länglichen Träger angeordnet. Je nach Anforderung der beabsichtigten Verwendung der Beleuchtungsvorrichtung kann es vorteilhaft sein, auch eine Zylinderlinse in einem länglichen LED-Reflektor-Linse-Modul zu integrieren. Dabei ist die Zylinderlinse auf den Öffnungen der aufgereihten Reflektorelemente mit den LED angeordnet. Schließlich können auch zwei oder mehr LED-Reflektor-Module bzw. LED-Reflektor-Linse-Module auf einem gemeinsamen weiteren Träger angeordnet sein, der dann in einem passenden Rohr angeordnet ist. Auch dieser Träger kann aus einzelnen, miteinander verbundenen Teilen bestehen. Durch den modularen Aufbau der Beleuchtungsvorrichtung lassen sich die einzelnen Komponenten bzw. Module relativ einfach einbauen bzw. austauschen.In order to achieve a sufficiently high irradiance on the surface to be irradiated or the target object, the cylindrical lens is designed as a converging lens. In this case, at least the surface of the cylindrical lens facing away from the LED is convexly shaped and the curvature of this surface is adapted to the curvature of the inner surface of the tube wall. This makes it possible that the cylindrical lens is arranged so that the surface facing away from the LED of the cylindrical lens rests against the inner surface of the tube wall. In this way, the cylindrical lens is particularly space-saving arrange within the tube. Optionally, the use of immersion minimizes light losses in the transition between cylindrical lens and tube wall. The cross section of the tube is preferably circular. According to the invention, at least one of the optical means is a reflector in which the LEDs are arranged. According to the invention, the reflector has individual funnel-like recesses for each LED, with the respective LED at the narrow end of the associated funnel-like depressions, ie at the reflector base, is arranged. The reflector can be one or more parts. In a preferred embodiment, the reflector is in several parts, with a separate individual reflector element being provided for each LED. In addition to efficient light collection and shaping, this has the advantage that if required, LED reflector modules of different lengths can be realized very flexibly. For this purpose, depending on the required length of the lighting device, two or more LEDs including respective reflector element are arranged side by side on a common elongate support. Depending on the requirement of the intended use of the illumination device, it may be advantageous to also integrate a cylindrical lens in an elongated LED reflector lens module. The cylindrical lens is arranged on the openings of the arrayed reflector elements with the LED. Finally, two or more LED reflector modules or LED reflector lens modules can also be arranged on a common further carrier, which is then arranged in a suitable tube. Also, this carrier may consist of individual, interconnected parts. Due to the modular design of the lighting device, the individual components or modules can be relatively easily installed or replaced.

Die in einer erfindungsgemäßen Beleuchtungsvorrichtung verwendeten LED müssen im übrigen nicht alle mit der selben Wellenlänge emittieren. Je nach Anwendung kann es auch vorteilhaft sein, beispielsweise in verschiedenen Lichtfarben strahlende LED oder VIS- / IR- / UVemittierende LED zu kombinieren.Incidentally, the LEDs used in a lighting device according to the invention need not all emit at the same wavelength. Depending on the application, it may also be advantageous to combine radiating LED or VIS / IR / UV emitting LEDs, for example in different light colors.

Insbesondere bei der Verwendung von Hochleistungs-LED kann es vorteilhaft sein, zumindest in dem Träger mindestens einen Kanal für das Durchleiten eines Kühlmittels vorzusehen, um eine aktive Kühlung der LED zu ermöglichen. Alternativ kann der Wärmeübergang zwischen Träger und Glasrohr-Innenwand durch geeignete Maßnahmen wie das Aufbringen von Wärmeleitpaste erleichtert werden. Schließlich kann der Innenraum des Rohres ganz oder teilweise mit einer Flüssigkeit gefüllt sein, um die Wärme der LEDs effektiv zu verteilen und über dir Rohrwand abzuführen.In particular, when using high-power LED, it may be advantageous to provide at least one channel for the passage of a coolant, at least in the carrier, in order to enable active cooling of the LED. Alternatively, the heat transfer between the carrier and glass tube inner wall can be facilitated by suitable measures such as the application of thermal paste. Finally, the interior of the tube may be completely or partially filled with a liquid to effectively distribute the heat of the LEDs and dissipate over the tube wall.

Zum Ausgleich von Toleranzen und zur Erhöhung der mechanischen Stabilität der Konstruktion, insbesondere der Vibrationsbeständigkeit ist es vorteilhaft, ein oder mehrere federnde Elemente einzufügen, welche eine oder mehrere Komponenten (Träger, Zylinderlinsen) gegen die Rohrinnenwand pressen.To compensate for tolerances and to increase the mechanical stability of the construction, in particular the vibration resistance, it is advantageous to insert one or more resilient elements, which press one or more components (support, cylindrical lenses) against the pipe inner wall.

Im Übrigen ist die erfindungsgemäße Beleuchtungsvorrichtung auch für Anwendungen geeignet, bei denen das Medium außerhalb des Rohres nicht die Umgebungsluft oder eine andere Atmosphäre sondern eine Flüssigkeit ist. Dabei müssen die optischen Parameter, beispielsweise die Brennweite der Sammellinse, gegebenenfalls entsprechend ausgelegt werden. Eine derartige Anwendung ist beispielsweise die Beleuchtung von Solarzelle in einem Elektrolytbad mit einer vorgegebenen Beleuchtungsstärkeverteilung. Ziel ist dabei, die Solarzelle durch den Lichteinfall leitfähig zu machen, um einen Stromfluss und das Aufbringen von Ionen aus der Elektrolytlösung zu ermöglichen. Ein derartiges Verfahren ist bereits bekannt, siehe z.B. die Schrift EP 0 171 129 A2 .Incidentally, the lighting device according to the invention is also suitable for applications in which the medium outside the tube is not the ambient air or another atmosphere but a liquid. In this case, the optical parameters, for example the focal length of the convergent lens, may have to be correspondingly designed. Such an application is, for example, the illumination of solar cells in an electrolyte bath with a predetermined illumination intensity distribution. The aim is to make the solar cell conductive by the incidence of light to allow a flow of current and the application of ions from the electrolyte solution. Such a method is already known, see for example the Scriptures EP 0 171 129 A2 ,

Kurze Beschreibung der Zeichnungen Brief description of the drawings

Im Folgenden soll die Erfindung anhand von Ausführungsbeispielen näher erläutert werden. Die Figuren zeigen:

Fig. 1a
eine erfindungsgemäße Beleuchtungsvorrichtung in einer Draufsicht,
Fig. 1b
eine Querschnittdarstellung der Beleuchtungsvorrichtung aus Fig. 1a entlang der Schnittlinie AB,
Fig. 2a
eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Beleuchtungsvorrichtung,
Fig. 2b
eine Stirnansicht der Beleuchtungsvorrichtung aus Fig. 2a,
Fig. 3
ein LED-Reflektor-Modul der Beleuchtungsvorrichtung aus Fig. 1a,
Fig. 4
eine gemessene Beleuchtungsstärkeverteilung der Beleuchtungsvorrichtung aus Fig. 1a.
In the following, the invention will be explained in more detail with reference to exemplary embodiments. The figures show:
Fig. 1a
a lighting device according to the invention in a plan view,
Fig. 1b
a cross-sectional view of the lighting device Fig. 1a along the section line AB,
Fig. 2a
a second embodiment of a lighting device according to the invention,
Fig. 2b
an end view of the lighting device Fig. 2a .
Fig. 3
an LED reflector module of the lighting device Fig. 1a .
Fig. 4
a measured illumination intensity distribution of the lighting device Fig. 1a ,

Bevorzugte Ausführung der ErfindungPreferred embodiment of the invention

Im Folgenden sind gleiche oder gleichartige Merkmale mit gleichen Bezugsziffern bezeichnet.Hereinafter, the same or similar features are designated by the same reference numerals.

Die Fig. 1a zeigt schematisch eine erfindungsgemäße Beleuchtungsvorrichtung 1 in einer Draufsicht, Fig. 1b zeigt eine Querschnittsansicht entlang der Linie AB. Die Beleuchtungsvorrichtung 1 dient insbesondere zur Beleuchtung von ausgedehnten Flächen bzw. Objekten. Dabei können Beleuchtungsvorrichtung 1 und/oder zu bestrahlendes Ziel erforderlichenfalls während der Bestrahlung auch gegeneinander bewegt werden.The Fig. 1a shows schematically a lighting device 1 according to the invention in a plan view, Fig. 1b shows a cross-sectional view along the line AB. The lighting device 1 is used in particular for illuminating extensive surfaces or objects. In this case, lighting device 1 and / or target to be irradiated if necessary, also be moved against each other during the irradiation.

Die Beleuchtungsvorrichtung 1 weist ein Rohr 2 aus Glas auf, in dessen Innenraum ein länglicher metallischer Träger 3, sechs LED 4 vom Typ Diamond Dragon® oder OSTAR® Compact (Fa. OSRAM Opto Semiconductors) auf einer gedruckten Leiterplatte (PCB), sechs den LED 4 individuell zugeordnete separate Reflektoren 5 sowie eine längliche bikonvexe Zylinderlinse 6 aus Quarzglas angeordnet sind. Die Außenkontur des länglichen Trägers 3 ist auf einer ersten Seite im Querschnitt als Teilkreis so ausgebildet, dass sie sich in die Innenfläche des Rohrs 2 einschmiegt. Auf der anderen Seite des Trägers 3 sind die sechs LED 4 sowie die zugehörigen sechs Reflektoren 5 in Längsrichtung in einer Reihe montiert. Jeder Reflektor 5 hat in der Draufsicht eine rechteckige Grundform, mit einer asymmetrischen Vertiefung 7, die sich - von einem viereckigen Reflektoröffnungsrand 8 ausgehend - zum Reflektorboden hin verjüngt und in einer Bohrung endet, durch die die zugehörige LED 4 hindurchragt. Aufgrund der asymmetrischen Auslegung der Reflektoren ist die Beleuchtungsvorrichtung 1 insbesondere für zu bestrahlende Flächen geeignet, deren Mittelsenkrechte nicht auf die LED-Reflektor-Elemente 4, 5 zeigt. Die gesamte Oberfläche der Reflektoren 5, einschließlich der Vertiefungen 7, ist mit einer reflektierenden Schicht (nicht dargestellt) versehen. Oberhalb der Reflektoröffnungsränder 8 ist die Zylindersammellinse 6 in parallel zur Längsachse beidseitig verlaufenden schmalen Erhebungen 9, 10 der Reflektoren 5 eingefasst. Die Krümmung der äußeren Fläche der Zylindersammellinse 6 ist ebenso wie diejenige der äußeren, von den Reflektoröffnungen abgewandte Abschnitte der Reflektoren 5 an die Krümmung der Innenfläche des Rohres 2 angepasst. Dadurch und durch die relativ kompakte und dichtgedrängte Bauweise wird eine optimale Ausnutzung des Innenraums des Rohres 2 erzielt. Zur Kühlung ist der Träger 3 mit zwei Längsbohrungen 11a, 11b für die Durchleitung einer Kühlflüssigkeit versehen.The lighting device 1 comprises a tube 2 made of glass, in the interior of which an elongated metallic carrier 3, six LED 4 of the Diamond Dragon® type or OSTAR® Compact (OSRAM Opto Semiconductors) on a printed circuit board (PCB), six the LED 4 individually associated separate reflectors 5 and an elongated biconvex cylindrical lens 6 are arranged made of quartz glass. The outer contour of the elongated carrier 3 is formed on a first side in cross section as a pitch circle so that it snuggles into the inner surface of the tube 2. On the other side of the carrier 3, the six LEDs 4 and the associated six reflectors 5 are mounted in the longitudinal direction in a row. Each reflector 5 has in plan view a rectangular basic shape, with an asymmetrical recess 7, which - starting from a quadrangular reflector opening edge 8 - tapers towards the reflector bottom and ends in a bore through which the associated LED 4 protrudes. Due to the asymmetrical design of the reflectors, the lighting device 1 is particularly suitable for surfaces to be irradiated, whose perpendicular bisector does not point to the LED reflector elements 4, 5. The entire surface of the reflectors 5, including the recesses 7, is provided with a reflective layer (not shown). Above the reflector opening edges 8, the cylindrical collecting lens 6 is enclosed in narrow elevations 9, 10 of the reflectors 5 extending on both sides parallel to the longitudinal axis. The curvature of the outer surface of the cylindrical collecting lens 6 is the same as that of the outer, of The reflector openings facing away from the portions of the reflectors 5 adapted to the curvature of the inner surface of the tube 2. As a result, and by the relatively compact and densely packed construction optimum utilization of the interior of the tube 2 is achieved. For cooling, the support 3 is provided with two longitudinal bores 11a, 11b for the passage of a cooling liquid.

Die Figuren 2a, 2b zeigen eine schematische Darstellung einer Draufsicht bzw. aufgeschnittenen Stirnansicht eines weiteren Ausführungsbeispiels einer erfindungsgemäßen Beleuchtungsvorrichtung 1'. Hier sind ebenfalls sechs LED 4 einschließlich der zugehörigen sechs Reflektoren 5' auf einem flachstabförmigen Träger 31 in Reihe angeordnet und bilden so ein LED-Reflektor-Modul 40 (siehe auch Fig. 3). Die Reflektoren 5' sind hier im Unterschied zum ersten Ausführungsbeispiel symmetrisch ausgebildet. Je nach Bedarf kann ein solches LED-Reflektor-Modul 40 auch mehr oder weniger LED-Reflektor-Elemente 4, 5' umfassen. Das LED-Reflektor-Modul 40 ist über eine Winkelschiene 12 auf der einen Seite eines länglichen Trägers 3' befestigt. Auf der anderen Seite ist die Außenkontur des länglichen Trägers 3' im Querschnitt als Teilkreis ausgebildet und schmiegt sich in die Innenfläche des Glasrohrs 2 ein. Je nach benötigter Länge der Beleuchtungsvorrichtung 1' können auf dem länglichen Träger 3' auch mehrere LED-Reflektor-Modul 40 angeordnet sein (nicht dargestellt). Dadurch ist dieses modulare Konzept sehr flexibel, wenn - je nach Anwendung - verschieden lange Beleuchtungsvorrichtungen 1' benötigt werden. Zwischen den Reflektoröffnungsrändern 8' und der Innenfläche des Rohres 2 ist eine längliche bikonvexen Zylinderlinse 6' angeordnet. Die Krümmung der äußeren Fläche der Zylindersammellinse 6' ist auch hier an die Krümmung der Innenfläche des Rohres 2 angepasst. Außerdem ist die Kontur der Reflektoröffnungen 8' an die Krümmung der zugewandten Fläche der Zylindersammellinse 6' angepasst. Die Zylindersammellinse 6' ist an ihren beiden Enden mit Hilfe eines auf dem länglichen Träger 3' montierten Haltebleches 13 (in Fig. 2 nur an einem Ende sichtbar) gehaltert.The FIGS. 2a, 2b show a schematic representation of a plan view or cutaway end view of another embodiment of a lighting device 1 'according to the invention. Here, too, six LEDs 4 including the associated six reflectors 5 'are arranged in series on a flat bar-shaped support 31 and thus form an LED reflector module 40 (see also FIG Fig. 3 ). The reflectors 5 'are formed symmetrically here in contrast to the first embodiment. Depending on requirements, such an LED reflector module 40 may also comprise more or fewer LED reflector elements 4, 5 '. The LED reflector module 40 is attached via an angle rail 12 on one side of an elongate carrier 3 '. On the other hand, the outer contour of the elongate carrier 3 'is formed in cross-section as a pitch circle and nestles in the inner surface of the glass tube 2 a. Depending on the required length of the lighting device 1 ', a plurality of LED reflector module 40 may also be arranged on the elongate support 3' (not shown). As a result, this modular concept is very flexible if - depending on the application - different lengths of lighting devices 1 'are required. Between the reflector opening edges 8 'and the inner surface of the tube 2 an elongated biconvex cylindrical lens 6' is arranged. The Curvature of the outer surface of the cylindrical collecting lens 6 'is here adapted to the curvature of the inner surface of the tube 2. In addition, the contour of the reflector openings 8 'is adapted to the curvature of the facing surface of the cylindrical collecting lens 6'. The cylindrical collecting lens 6 'is at its two ends by means of a holding plate 13 mounted on the elongate carrier 3' (in FIG Fig. 2 only visible at one end).

Zur elektrischen Versorgung der LED sind entsprechende Stromzuführungen vorgesehen (nicht dargestellt). Des weiteren kann die Treiberelektronik ganz oder teilweise auf dem PCB angeordnet sein. Je nach Anwendung, beispielsweise in einer Flüssigkeit, sind die beiden Enden der rohrförmigen Beleuchtungsvorrichtung geeignet verschlossen (nicht dargestellt).For the electrical supply of the LED corresponding power supply lines are provided (not shown). Furthermore, the driver electronics can be arranged wholly or partially on the PCB. Depending on the application, for example in a liquid, the two ends of the tubular lighting device are suitably closed (not shown).

Die Fig. 4 zeigt eine gemessene Beleuchtungsstärkeverteilung der Beleuchtungsvorrichtung aus Fig. 1a. Die y-Achse zeigt die Verteilung entlang der Längsachse der rohrförmigen Beleuchtungsvorrichtung, die x-Achse senkrecht dazu. Wie deutlich erkennbar ist, erzeugt die Beleuchtungsvorrichtung eine nahezu rechteckförmige, längliche Beleuchtungsstärkeverteilung mit relativ konstanter Beleuchtungsstärke. The Fig. 4 shows a measured illuminance distribution of the lighting device Fig. 1a , The y-axis shows the distribution along the longitudinal axis of the tubular lighting device, the x-axis perpendicular thereto. As can be clearly seen, the lighting device produces a nearly rectangular, elongated illuminance distribution with a relatively constant illuminance.

Claims (10)

  1. Lighting device (1, 1') having a tube (2), at least sections of which are transparent, and a plurality of light-emitting diodes (LEDs) (4), wherein the LEDs (4) are arranged within the tube (2) next to one another and parallel to the tube longitudinal axis (L), and wherein at least one separate optical means (5, 6; 5', 6') is arranged within the tube (2), wherein the at least one optical means comprises a cylindrical lens (6, 6'), characterized in that the at least one optical means comprises an elongate reflector (5, 5'), in which the LEDs (4) are arranged, wherein the reflector for each LED (4) has individual funnel-like depressions (7), and wherein the respective LED (4) is arranged at the narrow end of the associated funnel-like depressions (7).
  2. Lighting device according to Claim 1, wherein the cylindrical lens (6, 6') is in the form of a focusing lens.
  3. Lighting device according to Claim 2, wherein that face of the cylindrical lens (6, 6') which is remote from the LEDs (4) has a convex shape, and wherein the curvature of this face corresponds to the curvature of the inner face of the wall of the tube (2).
  4. Lighting device according to Claim 2, wherein that face of the cylindrical lens (6, 6') which is remote from the LEDs (4) bears against the inner face of the wall of the tube (2) .
  5. Lighting device according to Claim 1, wherein the reflector has a plurality of parts, and wherein a separate individual reflector element (5, 5') is provided for each LED (4).
  6. Lighting device according to one of the preceding claims, wherein the cylindrical lens (6, 6') is arranged on the opening in the reflector or the reflector elements (5, 5').
  7. Lighting device according to Claim 5, wherein two or more LEDs (4), including the respective reflector element (5'), are arranged next to one another on a common elongate mount (31) in the form of an elongate LED/ reflector module (4, 5', 31)
  8. Lighting device according to Claim 7, wherein a cylindrical lens (6') is arranged on the openings in the reflector elements (5') in the form of an elongate LED/reflector/lens module (4, 5', 6', 31).
  9. Lighting device according to Claim 7 or 8, wherein two or more LED/reflector modules or LED/reflector/lens modules are arranged on a common mount.
  10. Lighting device according to one of Claims 7 to 9, wherein the mount (3) has at least one channel (11a, 11b) for passing through a coolant.
EP10728194.1A 2009-07-31 2010-06-23 Lighting device with led's Not-in-force EP2459924B1 (en)

Applications Claiming Priority (2)

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DE102009035516.2A DE102009035516B4 (en) 2009-07-31 2009-07-31 Lighting device with LEDs
PCT/EP2010/058918 WO2011012381A1 (en) 2009-07-31 2010-06-23 Lighting device having light diodes

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EP2459924A1 EP2459924A1 (en) 2012-06-06
EP2459924B1 true EP2459924B1 (en) 2018-01-24

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EP (1) EP2459924B1 (en)
CN (1) CN102472433B (en)
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US20120127714A1 (en) 2012-05-24
CN102472433A (en) 2012-05-23
US8641233B2 (en) 2014-02-04
CN102472433B (en) 2015-05-06
EP2459924A1 (en) 2012-06-06
DE102009035516B4 (en) 2014-10-16
DE102009035516A1 (en) 2011-04-14

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