EP1255948B1 - Luminous diode arrangement with a reflector - Google Patents

Luminous diode arrangement with a reflector Download PDF

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Publication number
EP1255948B1
EP1255948B1 EP01925323A EP01925323A EP1255948B1 EP 1255948 B1 EP1255948 B1 EP 1255948B1 EP 01925323 A EP01925323 A EP 01925323A EP 01925323 A EP01925323 A EP 01925323A EP 1255948 B1 EP1255948 B1 EP 1255948B1
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EP
European Patent Office
Prior art keywords
reflector
light source
light
luminaire according
opening
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.)
Expired - Lifetime
Application number
EP01925323A
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German (de)
French (fr)
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EP1255948A1 (en
Inventor
Katharina Keller
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.)
ZUMTOBEL LIGHTING GmbH
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Zumtobel Lighting GmbH Austria
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Publication of EP1255948A1 publication Critical patent/EP1255948A1/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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • 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
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • the present invention relates to a luminaire according to the preamble of claim 1.
  • a generic lamp is for example from the Japanese Patent Laid-Open Publication No. 11-17220 known.
  • the arrangement of the light source within a reflector therefore has the advantage that the light radiated by the light emitting diode in a relatively large solid angle is captured and reflected by the reflector and thus in comparison to a direct illumination by the light emitting diode a much larger amount of light for the lighting purposes can be recycled.
  • Such lighting arrangements can be used because of the very good controllability of the light source in optoelectronic components and other display devices.
  • the in the JP 11-17229 the lighting arrangement described is limited in terms of their applications, since the amount of light emitted by the individual diode is not very high and therefore not sufficient for a number of lighting purposes.
  • the EP 0 570 987 A1 discloses a luminaire with a designed as an LED semiconductor chip light source, which is arranged substantially in the foot region of a pot-shaped reflector. This light source emits its light primarily in the light emission direction of the luminaire and only a small part of the emitted light is reflected by the reflector walls. Therefore, when looking at the luminaire, the light source appears as a bright spot.
  • the present invention is based on the object, from the JP 11-17229 to improve known lighting arrangement in that it is suitable for a variety of applications.
  • a luminaire which has the features of claim 1.
  • a carrier surface is used as the light source, on which a plurality of light-emitting diodes are arranged.
  • This light source is arranged substantially in the longitudinal axis of a - viewed from the light source - concave reflector, so that the light emitted by the light emitting diode in the opposite direction to the main beam direction of the reflector.
  • the ratio between the size of the support surface and the opening of the reflector is between 1: 3 and 1:20.
  • the use of a plurality of light-emitting diodes initially has the consequence that the total amount of light is significantly higher than that of a single light-emitting diode. Furthermore, it is possible to regulate the light source in terms of their overall luminosity in a much larger area but still very accurate and set different brightness levels. At the same time has become
  • the specified size ratio between the support surface and the reflector is found to be advantageous, since in this size range, on the one hand sufficiently high luminous intensities can be achieved, but on the other hand caused by the arranged in front of or within the reflector support surface no shadow throws in the light emitted by the reflector light.
  • the ratio between the support surface and the opening of the reflector is 1:10.
  • the aforementioned advantage that light-emitting diodes have a very good controllability, can also be used by the fact that LEDs of different colors are arranged together on the support surface.
  • LEDs of different colors are arranged together on the support surface.
  • red and green and blue light emitting diodes can be made with a relatively high efficiency, so that any color tones can be achieved by a suitable combination of these three colors or by a corresponding control of the light emitting diodes arranged on the support surface.
  • the luminaire according to the invention can be used for a variety of applications.
  • the very compact arrangement of the light-emitting semiconductor on the substrate can result in that a relatively high heat output is generated.
  • a practical embodiment of the invention can therefore be that on the back of the support surface - that is, the side opposite the light emitting diodes - a heat sink is arranged, which radiates the generated heat output as effectively as possible. Since the weight of the light source is relatively low, the current or control lines for the light-emitting diodes for holding the light source can preferably be used directly. These can, for example, span the reflector in diameter, so that the light source is arranged substantially in the plane of the reflector opening.
  • a further possibility can also consist in that the current or control lines used for the holder extend from the reflector inner side or the reflector center in the direction of the reflector opening, so that the distance of the light source from the reflector can be selected.
  • the light source in a focal point of the reflector since this arrangement ensures maximum utilization of the emitted light.
  • Fig. 1 shows a very general embodiment of a lamp according to the invention.
  • An essential element of this lamp is a dome-shaped or concave reflector 1 whose inner walls are highly reflective.
  • a light source 2 is arranged, which consists of a plurality of light emitting diodes arranged on a support surface.
  • the power supply and the driving of the individual light-emitting diodes via power and control lines 5, which span the reflector diameter of one edge of the reflector opening to the other and at the same time serve as a holder for the light source 2.
  • the light source 2 is arranged in the focal point of the reflector 1, so that the entire in an angular range of 180 ° upwardly radiated light of the LEDs can be used for the intended lighting purpose.
  • Fig. 2 shows an enlarged view of the light source 2 according to the invention on a support surface 3 while a plurality of light-emitting diode chips (dice) 4 are arranged. These can emit light in different colors, so that with a suitable control of the light-emitting diodes 4 for the light emitted by the light total different shades can be achieved.
  • a heat sink 6 is arranged to increase the heat radiation. As a result, overheating of the entire light source 2 and thus an impairment of the Wrkungsgrads or even damage to the LEDs 4 is avoided.
  • the two leads 5 serve both the power supply and the transmission of control signals for selectively driving the different LEDs 4 to achieve the desired hue.
  • the lamp Due to the compact arrangement of the light-emitting diode chips, a considerable luminosity can be achieved, so that the lamp is also suitable for applications in which higher luminous intensities are required. At the same time, however, homogeneous illumination should be achieved by the light emitted by the reflector 1.
  • the size ratio specified according to the invention between the support surface 3 and the reflector 1 ensures that the light source 2 does not cause any shadow itself.
  • the inside of the reflector matches that of the Light emitting diodes 4 emitted light diffusely reflected, which also supports a mixing of the different shades.
  • FIGS. 3a to 3c now different mounting options for the light source 2 are explained within the dome-like reflector 1.
  • bracket corresponds to the in Fig. 1 illustrated light.
  • the light source 2 serve the current or control lines 5, which span over the edge of the reflector 1 of these diameter-like, the light source 2 is located exactly in the middle and thus in the longitudinal axis of the reflector 1.
  • Fig. 3b An alternative suspension type is in Fig. 3b shown, in which the current and control lines 5 extend obliquely downward from the inside of the reflector, which has the advantage that the light source 2 does not necessarily have to be arranged in the plane of the reflector opening, but for example also further within the reflector 1 or even can be arranged protruding.
  • Fig. 3c shown holder in which the light source 2 is formed by a extending from the reflector center along the longitudinal axis of the reflector 1 extending rod-shaped holder 5, which may also include the power and control lines.
  • the light source 2 is adjustable in its distance from the reflector 1, so that by changing along the longitudinal axis of the light cone generated by the reflector 1 can be changed.

Abstract

The invention relates to a luminaire having a light source (2) which has at least one light emitting semiconductor, and having a, as seen from the light source (2), concave reflector (1), the light source (2) being arranged in substance in the longitudinal axis of the reflector (1). In accordance with the invention, the light source (2) is of a plurality of luminous diodes (4) arranged on a carrier surface (3) and controllable, the ratio between the carrier surface (3) and the opening of the reflector (1) being between 1:3 and 1:20.

Description

Die vorliegende Erfindung betrifft eine Leuchte nach dem Oberbegriff des Anspruchs 1.The present invention relates to a luminaire according to the preamble of claim 1.

Eine gattungsgemäße Leuchte ist beispielsweise aus der japanischen Offenlegungsschrift JP 11-17220 bekannt. Diese beschreibt eine Beleuchtungsanordnung, bei der eine einzelne Leuchtdiode innerhalb eines Reflektors angeordnet ist, so dass das von dieser Leuchtdiode emittierte Licht zur indirekten Beleuchtung verwendet wird. Die Anordnung der Lichtquelle innerhalb eines Reflektors weist deshalb den Vorteil auf, dass das in einem relativ großen Raumwinkel von der Leuchtdiode abgestrahlte Licht durch den Reflektor aufgefangen und reflektiert wird und somit im Vergleich zu einer direkten Beleuchtung durch die Leuchtdiode eine wesentlich größere Lichtmenge für die Beleuchtungszwecke verwertet werden kann.A generic lamp is for example from the Japanese Patent Laid-Open Publication No. 11-17220 known. This describes a lighting arrangement in which a single light-emitting diode is arranged within a reflector, so that the light emitted by this light-emitting diode is used for indirect illumination. The arrangement of the light source within a reflector therefore has the advantage that the light radiated by the light emitting diode in a relatively large solid angle is captured and reflected by the reflector and thus in comparison to a direct illumination by the light emitting diode a much larger amount of light for the lighting purposes can be recycled.

Derartige Beleuchtungsanordnungen können aufgrund der sehr guten Steuerbarkeit der Lichtquelle in optoelektronischen Bauelementen sowie anderen Anzeigevorrichtungen verwendet werden. Die in der JP 11-17229 beschriebene Beleuchtungsanordnung ist allerdings hinsichtlich ihrer Anwendungsmöglichkeiten beschränkt, da die von der einzelnen Diode abgegebene Lichtmenge nicht sehr hoch und daher für eine Reihe von Beleuchtungszwecken nicht ausreichend ist.Such lighting arrangements can be used because of the very good controllability of the light source in optoelectronic components and other display devices. The in the JP 11-17229 However, the lighting arrangement described is limited in terms of their applications, since the amount of light emitted by the individual diode is not very high and therefore not sufficient for a number of lighting purposes.

Die EP 0 570 987 A1 offenbart eine Leuchte mit einer als LED-Halbleiterchip ausgestalteten Lichtquelle, die im wesentlichen im Fußbereich eines topfartigen Reflektors angeordnet ist. Diese Lichtquelle strahlt ihr Licht primär in Lichtabstrahlrichtung der Leuchte ab und nur ein geringer Teil des abgestrahlten Lichtes wird von den Reflektorwänden reflektiert. Daher erscheint die Lichtquelle bei Betrachtung der Leuchte als heller Punkt.The EP 0 570 987 A1 discloses a luminaire with a designed as an LED semiconductor chip light source, which is arranged substantially in the foot region of a pot-shaped reflector. This light source emits its light primarily in the light emission direction of the luminaire and only a small part of the emitted light is reflected by the reflector walls. Therefore, when looking at the luminaire, the light source appears as a bright spot.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die aus der JP 11-17229 bekannte Beleuchtungsanordnung dahingehend zu verbessern, dass diese für eine Vielzahl von Anwendungsmöglichkeiten geeignet ist.The present invention is based on the object, from the JP 11-17229 to improve known lighting arrangement in that it is suitable for a variety of applications.

Die Aufgabe wird durch eine Leuchte, welche die Merkmale des Anspruches 1 aufweist, gelöst. Erfindungsgemäß wird als Lichtquelle eine Trägerfläche verwendet, auf der eine Vielzahl von Leuchtdioden angeordnet sind. Diese Lichtquelle wird im wesentlichen in der Längsachse eines - von der Lichtquelle aus gesehen - konkaven Reflektors angeordnet, so dass das von den Leuchtdioden abgegebene Licht in der entgegengesetzten Richtung zur Hauptstrahlrichtung des Reflektors strahlt. Dabei liegt das Verhältnis zwischen der Größe der Trägerfläche und der Öffnung des Reflektors zwischen 1:3 und 1:20.The object is achieved by a luminaire, which has the features of claim 1. According to the invention, a carrier surface is used as the light source, on which a plurality of light-emitting diodes are arranged. This light source is arranged substantially in the longitudinal axis of a - viewed from the light source - concave reflector, so that the light emitted by the light emitting diode in the opposite direction to the main beam direction of the reflector. The ratio between the size of the support surface and the opening of the reflector is between 1: 3 and 1:20.

Das Verwenden einer Vielzahl von Leuchtdioden hat zunächst zur Folge, dass die gesamt Lichtmenge deutlich höher als die einer einzelnen Leuchtdiode ist. Ferner besteht die Möglichkeit, die Lichtquelle hinsichtlich ihrer gesamten Leuchtstärke in einem wesentlich größeren Bereich aber dennoch sehr exakt zu regulieren und unterschiedliche Helligkeitsstufen einzustellen. Gleichzeitig hat sich allerdings das angegebene Größenverhältnis zwischen der Trägerfläche und dem Reflektor als vorteilhaft herausgestellt, da in diesem Größenbereich einerseits ausreichend hohe Leuchtstärken erzielt werden können, andererseits aber durch die vor oder innerhalb des Reflektors angeordnete Trägerfläche keine Schattenwürfe in dem von dem Reflektor abgestrahlten Licht entstehen. Vorzugsweise beträgt das Verhältnis zwischen der Trägerfläche und der Öffnung des Reflektors 1:10.The use of a plurality of light-emitting diodes initially has the consequence that the total amount of light is significantly higher than that of a single light-emitting diode. Furthermore, it is possible to regulate the light source in terms of their overall luminosity in a much larger area but still very accurate and set different brightness levels. At the same time has become However, the specified size ratio between the support surface and the reflector is found to be advantageous, since in this size range, on the one hand sufficiently high luminous intensities can be achieved, but on the other hand caused by the arranged in front of or within the reflector support surface no shadow throws in the light emitted by the reflector light. Preferably, the ratio between the support surface and the opening of the reflector is 1:10.

Der zuvor erwähnte Vorteil, daß Leuchtdioden eine sehr gute Steuerbarkeit aufweisen, kann ferner auch dadurch genutzt werden, daß Leuchtdioden verschiedener Farben gemeinsam auf der Trägerfläche angeordnet werden. Mittlerweile können neben den bekannten roten und grünen auch blaue Leuchtdioden mit einem relativ hohen Wirkungsgrad hergestellt werden, so daß durch eine geeignete Kombination dieser drei Farben bzw. durch eine entsprechende Ansteuerung der auf der Trägerfläche angeordneten Leuchtdioden beliebige Farbtöne erzielt werden können. Somit kann die erfindungsgemäße Leuchte für eine Vielzahl von Anwendungszwecken verwendet werden.The aforementioned advantage that light-emitting diodes have a very good controllability, can also be used by the fact that LEDs of different colors are arranged together on the support surface. Meanwhile, in addition to the known red and green and blue light emitting diodes can be made with a relatively high efficiency, so that any color tones can be achieved by a suitable combination of these three colors or by a corresponding control of the light emitting diodes arranged on the support surface. Thus, the luminaire according to the invention can be used for a variety of applications.

Die sehr kompakte Anordnung der lichtemittierenden Halbleiter auf dem Substrat kann zur Folge haben, daß eine relativ hohe Wärmeleistung erzeugt wird. Eine praktische Ausgestaltung der Erfindung kann daher darin bestehen, daß auf der Rückseite der Trägerfläche - also der den Leuchtdioden gegenüberliegenden Seite - ein Kühlkörper angeordnet ist, der die erzeugte Wärmeleistung möglichst effektiv abstrahlt. Da das Gewicht der Lichtquelle relativ gering ist, können vorzugsweise direkt die Strom- oder Steuerleitungen für die Leuchtdioden zur Halterung der Lichtquelle verwendet werden. Diese können beispielsweise den Reflektor durchmesserartig überspannen, so daß die Lichtquelle im wesentlichen in der Ebene der Reflektoröffnung angeordnet ist. Eine weitere Möglichkeit kann allerdings auch darin bestehen, daß sich die für die Halterung verwendeten Strom- oder Steuerleitungen von der Reflektorinnenseite bzw. dem Reflektorzentrum aus in Richtung der Reflektoröffnung erstrecken, so daß der Abstand der Lichtquelle von dem Reflektor wählbar ist. Besonders vorteilhaft befindet sich die Lichtquelle in einem Brennpunkt des Reflektors, da diese Anordnung eine maximale Verwertung des abgegebenen Lichts gewährleistet.The very compact arrangement of the light-emitting semiconductor on the substrate can result in that a relatively high heat output is generated. A practical embodiment of the invention can therefore be that on the back of the support surface - that is, the side opposite the light emitting diodes - a heat sink is arranged, which radiates the generated heat output as effectively as possible. Since the weight of the light source is relatively low, the current or control lines for the light-emitting diodes for holding the light source can preferably be used directly. These can, for example, span the reflector in diameter, so that the light source is arranged substantially in the plane of the reflector opening. However, a further possibility can also consist in that the current or control lines used for the holder extend from the reflector inner side or the reflector center in the direction of the reflector opening, so that the distance of the light source from the reflector can be selected. Particularly advantageous is the light source in a focal point of the reflector, since this arrangement ensures maximum utilization of the emitted light.

Im folgenden soll die Erfindung anhand der beiliegenden Zeichnung näher erläutert werden.In the following the invention will be explained in more detail with reference to the accompanying drawings.

Es zeigen:

  • Fig. 1 eine erfindungsgemäße Leuchte in perspektivischer Darstellung;
  • Fig. 2 eine nähere Ausgestaltung der erfindungsgemäßen Lichtquelle; und
  • Fig. 3a bis 3c verschiedene Halterungsmöglichkeiten für die Lichtquelle.
Show it:
  • Fig. 1 a lamp according to the invention in a perspective view;
  • Fig. 2 a detailed embodiment of the light source according to the invention; and
  • Fig. 3a to 3c various mounting options for the light source.

Fig. 1 zeigt ein sehr allgemeines Ausführungsbeispiel einer erfindungsgemäßen Leuchte. Wesentliches Element dieser Leuchte ist ein kuppelförmiger bzw. konkaver Reflektor 1 dessen Innenwände hoch-reflektierend sind. Im Schnittpunkt der Längsachse des Reflektors 1 mit seiner Öffnungsebene ist eine Lichtquelle 2 angeordnet, die aus einer Vielzahl von auf einer Trägerfläche angeordneten Leuchtdioden besteht. Die Stromversorgung und das Ansteuern der einzelnen Leuchtdioden erfolgt über Strom- und Steuerleitungen 5, die den Reflektor durchmesserartig von einem Rand der Reflektoröffnung zum anderen überspannen und zugleich als Halterung für die Lichtquelle 2 dienen. Eine besonders vorteilhafte Ausgestaltung besteht darin, daß die Lichtquelle 2 im Brennpunkt des Reflektors 1 angeordnet ist, so daß das gesamte in einem Winkelbereich von 180° nach oben abgestrahlte Licht der Leuchtdioden für den vorgesehenen Beleuchtungszweck verwendet werden kann. Fig. 1 shows a very general embodiment of a lamp according to the invention. An essential element of this lamp is a dome-shaped or concave reflector 1 whose inner walls are highly reflective. At the intersection of the longitudinal axis of the reflector 1 with its opening plane, a light source 2 is arranged, which consists of a plurality of light emitting diodes arranged on a support surface. The power supply and the driving of the individual light-emitting diodes via power and control lines 5, which span the reflector diameter of one edge of the reflector opening to the other and at the same time serve as a holder for the light source 2. A particularly advantageous embodiment is that the light source 2 is arranged in the focal point of the reflector 1, so that the entire in an angular range of 180 ° upwardly radiated light of the LEDs can be used for the intended lighting purpose.

Fig. 2 zeigt eine vergrößerte Darstellung der erfindungsgemäßen Lichtquelle 2. Auf einer Trägerfläche 3 sind dabei eine Vielzahl von Leuchtdioden-Chips (dice) 4 angeordnet. Diese können Licht in jeweils unterschiedlichen Farben emittieren, so daß bei einer geeigneten Ansteuerung der Leuchtdioden 4 für das von der Leuchte insgesamt abgegebene Licht unterschiedliche Farbtöne erzielt werden können. An der den Leuchtdioden 4 gegenüberliegenden Seite der Trägerfläche 3 ist dabei zu einer Erhöhung der Wärmeabstrahlung ein Kühlkörper 6 angeordnet. Hierdurch wird eine Überhitzung der gesamten Lichtquelle 2 und somit eine Beeinträchtigung des Wrkungsgrads oder gar eine Beschädigung der Leuchtdioden 4 vermieden. Die beiden Anschlußleitungen 5 dienen sowohl der Stromversorgung als auch der Übertragung von Steuersignalen zum gezielten Ansteuern der unterschiedlichen Leuchtdioden 4 zum Erzielen des gewünschten Farbtones. Fig. 2 shows an enlarged view of the light source 2 according to the invention on a support surface 3 while a plurality of light-emitting diode chips (dice) 4 are arranged. These can emit light in different colors, so that with a suitable control of the light-emitting diodes 4 for the light emitted by the light total different shades can be achieved. At the light emitting diodes 4 opposite side of the support surface 3 is a heat sink 6 is arranged to increase the heat radiation. As a result, overheating of the entire light source 2 and thus an impairment of the Wrkungsgrads or even damage to the LEDs 4 is avoided. The two leads 5 serve both the power supply and the transmission of control signals for selectively driving the different LEDs 4 to achieve the desired hue.

Durch die kompakte Anordnung der Leuchtdioden-Chips kann eine beachtliche Leuchtstärke erzielt werden, so daß die Leuchte auch für Anwendungszwecke geeignet ist, in denen höhere Leuchtstärken benötigt werden. Gleichzeitig soll jedoch durch das von dem Reflektor 1 abgestrahlte Licht eine homogene Beleuchtung erzielt werden. Das erfindungsgemäß angegebene Größenverhältnis zwischen der Trägerfläche 3 und dem Reflektor 1 stellt dabei sicher, daß die Lichtquelle 2 selbst keinen Schattenwurf verursacht. Um das Erzeugen einer gleichmäßigen Lichtabstrahlung zusätzlich zu unterstützen, kann vorgesehen sein, daß die Reflektorinnenseite das von den Leuchtdioden 4 abgegebene Licht diffus reflektiert, was ferner auch ein Vermischen der verschiedenen Farbtöne unterstützt.Due to the compact arrangement of the light-emitting diode chips, a considerable luminosity can be achieved, so that the lamp is also suitable for applications in which higher luminous intensities are required. At the same time, however, homogeneous illumination should be achieved by the light emitted by the reflector 1. The size ratio specified according to the invention between the support surface 3 and the reflector 1 ensures that the light source 2 does not cause any shadow itself. In order to additionally support the generation of a uniform light emission, it can be provided that the inside of the reflector matches that of the Light emitting diodes 4 emitted light diffusely reflected, which also supports a mixing of the different shades.

Anhand der Figuren 3a bis 3c sollen nunmehr verschiedene Halterungsmöglichkeiten für die Lichtquelle 2 innerhalb des kuppelartigen Reflektors 1 erläutert werden.Based on FIGS. 3a to 3c now different mounting options for the light source 2 are explained within the dome-like reflector 1.

Die in Fig. 3a dargestellte Halterung entspricht dabei der in Fig. 1 dargestellten Leuchte. Als Halterung für die Lichtquelle 2 dienen dabei die Strom- bzw. Steuerleitungen 5, die vom Rand des Reflektors 1 aus diesen durchmesserartig überspannen, wobei die Lichtquelle 2 genau in der Mitte und somit in der Längsachse des Reflektors 1 angeordnet ist.In the Fig. 3a shown bracket corresponds to the in Fig. 1 illustrated light. As a holder for the light source 2 serve the current or control lines 5, which span over the edge of the reflector 1 of these diameter-like, the light source 2 is located exactly in the middle and thus in the longitudinal axis of the reflector 1.

Eine dazu alternative Aufhängungsart ist in Fig. 3b dargestellt, in der sich die Strom- und Steuerleitungen 5 von der Innenseite des Reflektors schräg nach unten erstrecken, was den Vorteil hat, daß die Lichtquelle 2 nicht unbedingt in der Ebene der Reflektoröffnung angeordnet sein muß, sondern beispielsweise auch weiter innerhalb des Reflektors 1 oder sogar hervorstehend angeordnet sein kann. Diese Möglichkeit besteht auch bei der dritten in Fig. 3c dargestellten Halterung, bei der die Lichtquelle 2 durch eine sich von dem Reflektorzentrum aus entlang der Längsachse des Reflektors 1 erstreckende stabförmige Halterung 5 gebildet wird, die gleichfalls die Strom- und Steuerleitungen beinhalten kann. Hier kann beispielsweise auch vorgesehen sein, daß die Lichtquelle 2 in ihrem Abstand zu dem Reflektor 1 verstellbar ist, so daß durch ein Verschieben entlang der Längsachse der durch den Reflektor 1 erzeugte Lichtkegel verändert werden kann.An alternative suspension type is in Fig. 3b shown, in which the current and control lines 5 extend obliquely downward from the inside of the reflector, which has the advantage that the light source 2 does not necessarily have to be arranged in the plane of the reflector opening, but for example also further within the reflector 1 or even can be arranged protruding. This possibility also exists at the third in Fig. 3c shown holder, in which the light source 2 is formed by a extending from the reflector center along the longitudinal axis of the reflector 1 extending rod-shaped holder 5, which may also include the power and control lines. Here, for example, it can also be provided that the light source 2 is adjustable in its distance from the reflector 1, so that by changing along the longitudinal axis of the light cone generated by the reflector 1 can be changed.

Claims (9)

  1. Luminaire having a light source (2) which has at least one light emitting semiconductor, and having a - seen from the light source - concave reflector (1), wherein the light source is arranged in substance in the longitudinal axis of the reflector and emits light in the direction opposite to the main emission direction of the reflector,
    characterised in that,
    the light source (2) is comprised of a plurality of controllable light emitting diode chips arranged on a carrier surface (3), and in that the ratio between the carrier surface and of the opening of the reflector (1) lies between 1:3 and 1:20, wherein a cooling body is arranged on the underside of the carrier surface.
  2. Luminaire according to claim 1, characterised in that,
    the ratio between the carrier surface (3) and the opening of the reflector (1) is 1:10.
  3. Luminaire according to claim 1 or 2,
    characterised in that,
    the light emitting diodes (4) emit light in different colors.
  4. Luminaire according to any of claims 1 to 3,
    characterised in that,
    the light source (2) is held by current or control lines (5).
  5. Luminaire according to claim 4,
    characterised in that,
    the current or control lines (5) span over the reflector opening.
  6. Luminaire according to claim 4,
    characterised in that,
    the current or control lines (5) extend from the reflector inner side or the reflector centre to the reflector opening.
  7. Luminaire according to claim 6,
    characterised in that,
    the light source (2) is adjustable in its spacing from the reflector (1).
  8. Luminaire according to any of claims 1 to 6,
    characterised in that,
    the light source (2) is arranged at a focal point of the reflector (1).
  9. Luminaire according to any preceding claim,
    characterised in that,
    the inner side of the reflector (1) is diffusely reflecting.
EP01925323A 2000-02-14 2001-01-29 Luminous diode arrangement with a reflector Expired - Lifetime EP1255948B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20002565U 2000-02-14
DE20002565U DE20002565U1 (en) 2000-02-14 2000-02-14 LED arrangement with reflector
PCT/EP2001/000934 WO2001059359A1 (en) 2000-02-14 2001-01-29 Luminous diode arrangement with a reflector

Publications (2)

Publication Number Publication Date
EP1255948A1 EP1255948A1 (en) 2002-11-13
EP1255948B1 true EP1255948B1 (en) 2008-03-12

Family

ID=7937254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01925323A Expired - Lifetime EP1255948B1 (en) 2000-02-14 2001-01-29 Luminous diode arrangement with a reflector

Country Status (6)

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US (1) US6857763B2 (en)
EP (1) EP1255948B1 (en)
AT (1) ATE389143T1 (en)
AU (1) AU2001252121A1 (en)
DE (2) DE20002565U1 (en)
WO (1) WO2001059359A1 (en)

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Also Published As

Publication number Publication date
US6857763B2 (en) 2005-02-22
AU2001252121A1 (en) 2001-08-20
ATE389143T1 (en) 2008-03-15
WO2001059359A1 (en) 2001-08-16
US20020191398A1 (en) 2002-12-19
EP1255948A1 (en) 2002-11-13
DE20002565U1 (en) 2001-06-28
DE50113726D1 (en) 2008-04-24

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