EP2473008A2 - Method and lighting device for lighting an object with multiple light sources - Google Patents

Method and lighting device for lighting an object with multiple light sources Download PDF

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Publication number
EP2473008A2
EP2473008A2 EP12150054A EP12150054A EP2473008A2 EP 2473008 A2 EP2473008 A2 EP 2473008A2 EP 12150054 A EP12150054 A EP 12150054A EP 12150054 A EP12150054 A EP 12150054A EP 2473008 A2 EP2473008 A2 EP 2473008A2
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Prior art keywords
light
light sources
color
illumination device
light source
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Granted
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EP12150054A
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German (de)
French (fr)
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EP2473008B1 (en
EP2473008A3 (en
Inventor
Martin Kenneth
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Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the present invention relates to a method and a lighting device for illuminating an object, wherein the object is illuminated with a plurality of light sources, each of which emits light in a specific color or a specific wavelength range.
  • Luminaires or lighting devices with a plurality of differently colored, spectrally narrow-band light sources for example LEDs, in which each light source can be controlled or controlled individually, are usually used when a mixed light color is to be color variable or when illuminating objects, such as food, whose appearance should be optimized or adapted.
  • the present invention is accordingly based on the object to provide a method or a lighting device, with the help of which the illumination of an object with a desired minimum color rendering is as energy efficient as possible.
  • a lighting device which has a plurality of light sources, in particular LEDs, wherein each light source emits light of a specific color or a specific wavelength range, which differs preferably in color or in the wavelength range from the light of the other light sources.
  • the light sources are thus differently colored, spectrally narrow-band light sources, whereby the illumination device is able to emit light of any desired color location or any color temperature by mixing the light of the different light sources.
  • the invention provides that the illumination device has means which detect the reflection properties of an object to be illuminated, in which case the light output of the light sources is controlled as a function of the reflection properties and a minimum color rendering value.
  • the minimum color rendering value is input via operating means which are attached to or in the illumination device.
  • the light output of the light sources is then controlled or regulated by a control unit.
  • the means for detecting the reflection properties are preferably a camera, in particular a grayscale camera or a plurality of grayscale sensors coupled to one another.
  • operating means for inputting a color temperature value in or on the illumination device can also be provided, in which case the light output of the light sources is additionally controlled or regulated by the control unit as a function of the color temperature value.
  • each light source of the illumination device can be illuminated individually one after the other in order to detect the reflection properties, and in each case the spectral response of the object is detected.
  • Each light source illuminates the object first with a high and then with a low intensity.
  • FIG. 1 shows a lighting device 1 according to the invention, which has a plurality of light sources 2, a camera 3, a control unit 4 and various control means 5 and 6.
  • the light sources 2 are spectrally narrow-band light sources that emit light in different colors or different wavelength ranges.
  • the wavelength ranges for four different light sources are shown, wherein a first light source in particular blue light and thus in a wavelength range between 420 and 490nm, a second light source in green and thus in a wavelength range between 490 and 575nm, a third light source orange light and thus in a wavelength range between 585 and 650 nm and a fourth light source emits light in red and thus in a wavelength range between 650 and 750 nm.
  • the illumination device 1 an analysis of the properties of the object to be illuminated is performed.
  • the reflection properties of the object are relevant to the present invention.
  • all the light sources 2 are activated and deactivated one after the other, whereby each time the spectral response of the object is detected by the camera 3, which is arranged within the illumination device 1 in such a way that it is able to is to capture or record the object to be illuminated by the lighting device 1.
  • each light source 2 individually and sequentially illuminates the object.
  • the blue light source will be activated first, with all other light sources disabled.
  • the camera 3 detects the spectral response of the object to the light emitted by the blue light source.
  • the blue light source emits the light first with a high intensity and then with a lower intensity onto the object, wherein the camera 3 detects the spectral response of the object in each case.
  • the blue light source After the blue light source has first emitted light with a high and then with a low intensity on the object, this is deactivated and the next light source, for example the green light source, activated, again light first with a high and then with a low Intensity is emitted and both times by the camera 3, the corresponding spectral response of the object is detected or recorded.
  • the next light source for example the green light source, activated, again light first with a high and then with a low Intensity is emitted and both times by the camera 3, the corresponding spectral response of the object is detected or recorded.
  • each light source 2 is activated and deactivated one by one and in succession and, in addition, first radiates light onto the object in a high and then in a low intensity.
  • the spectral response to the light of the respective light source 2 is shown by way of example in each case, the difference between the higher and lower intensity for each light source 2 being clearly recognizable from this diagram.
  • the lower diagram in FIG. 3 now represents the spectral responses to the light of the different light sources 2 for a pixel, since the evaluation is also done pixel by pixel.
  • the reflection properties of the object or the reflection properties of each individual pixel of the camera 3, which accordingly detects or evaluates the object then result.
  • the information shown in the lower diagram is, for example, a pixel having a relatively high proportion of red, a medium proportion of blue and orange and a low proportion of green.
  • control unit 4 can then determine or determine which spectral properties of the light used for the subsequent illumination are required in order to achieve a desired minimum color rendering value as a function of the object.
  • This desired minimum color rendering value can be selected by the user via the control means 5 designed as a slider.
  • the control means 5 designed as a slider.
  • labels can be attached, showing the relationship between minimum color rendering value and energy conservation.
  • the control unit 4 calculates with the aid of the reflection properties of the object which light the illuminator 1 must emit in order to achieve this minimum light reproduction value for all pixels, that is to say that the final result is based on the pixel for which the lowest color rendering value is at least achieved.
  • FIG. 4 is now exemplified for the color rendering values 50, 90 and 100, a corresponding control of the light sources 2 is shown, wherein the curve A respectively shows the reflection properties of the object at a pixel, with the reflection properties from the below in FIG. 3 corresponds to the diagram shown.
  • the curves B, C and D then show in each case to what extent the light sources must be driven to the given
  • a color rendering value of 50 requires in particular a bright glow of the blue and red light sources.
  • the curves B, C and D in FIG. 4 have now been calculated by the control unit 4 so that they each correspond to a total color temperature of 3000K.
  • this has further, designed as a slider control means 6, through which the color temperature of the emitted light can be adjusted.
  • the control unit 4 then takes into account in the calculation with which light component the minimum color rendering value for all pixels is achieved also the set color temperature.
  • the color properties of an object to be illuminated are detected and the different color channels of the illumination device are automatically controlled with this information such that the emitted mixed light lies in the selected color temperature range and the color reproduction is in such a manner dependent on the recognized colors is adjusted so that the color rendering value is greater than or equal to the set minimum color rendering value.
  • the required energy of the lighting device 1 is reduced as much as possible, since the color rendering value can be adjusted depending on the colors of the object, whereby the greatest possible savings, since the light sources 2 are controlled only as at least required for the corresponding color rendering value ,
  • the illumination device can furthermore also have one white or several white light sources.
  • the illumination device can also have further or alternative input elements, by means of which a gain (increase in brightness) or attenuation of specific light-specific predetermined object colors can be set under the illumination.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The method involves emitting light of specific color or predetermined wavelength from light sources (2) such as LEDs of illumination device (1). A camera (3) is arranged in the illumination device, in order to detect the reflection properties of the object. The light emitted from the light sources is controlled based on the reflection properties of the object, and color rendering value of the illumination device is adjusted to minimum value. An independent claim is included for illumination device.

Description

Die vorliegende Erfindung betrifft ein Verfahren und eine Beleuchtungseinrichtung zur Beleuchtung eines Objektes, wobei das Objekt mit mehreren Lichtquellen beleuchtet wird, die jeweils Licht in einer bestimmten Farbe bzw. einem bestimmten Wellenlängenbereich abgeben.The present invention relates to a method and a lighting device for illuminating an object, wherein the object is illuminated with a plurality of light sources, each of which emits light in a specific color or a specific wavelength range.

Leuchten bzw. Beleuchtungseinrichtungen mit mehreren verschiedenfarbigen, spektral engbandigen Lichtquellen, beispielsweise LEDs, bei denen jede Lichtquelle einzeln geregelt bzw. gesteuert werden kann, finden meist Anwendung, wenn eine gemischte Lichtfarbe farbveränderlich sein soll oder wenn bei der Beleuchtung von Objekten, wie beispielsweise Lebensmitteln, deren Erscheinungsbild optimiert oder angepasst werden soll. Zusätzlich ist es bei derartigen Beleuchtungseinrichtungen auch möglich, die Farbwiedergabe bzw. den Farbwiedergabewert aufgrund der verschiedenfarbigen Lichtquellen zu variieren.Luminaires or lighting devices with a plurality of differently colored, spectrally narrow-band light sources, for example LEDs, in which each light source can be controlled or controlled individually, are usually used when a mixed light color is to be color variable or when illuminating objects, such as food, whose appearance should be optimized or adapted. In addition, it is also possible in such lighting devices to vary the color rendering or the color rendering value due to the differently colored light sources.

Bei der Beleuchtung von Objekten, beispielsweise von Bildern in Museen oder von Lebensmitteln in Supermärkten, ist zumeist ein Mindest-Farbwiedergabewert erwünscht. Hierbei ergibt sich jedoch das Problem, dass je höher der Farbwiedergabewert ist, umso höher ist in der Regel auch der Energieverbrauch der Beleuchtungseinrichtung.When lighting objects, such as pictures in museums or food in supermarkets, a minimum color rendering value is usually desired. However, the problem arises here that the higher the color rendering value, the higher the energy consumption of the illumination device is, as a rule.

Der vorliegenden Erfindung liegt dementsprechend die Aufgabe zu Grunde, ein Verfahren bzw. eine Beleuchtungseinrichtung zu schaffen, mit deren Hilfe die Beleuchtung eines Objektes bei einer gewünschten Mindest-Farbwiedergabe möglichst energieeffizient erfolgt.The present invention is accordingly based on the object to provide a method or a lighting device, with the help of which the illumination of an object with a desired minimum color rendering is as energy efficient as possible.

Die Aufgabe wird durch ein Verfahren gemäß Anspruch 1 und eine Beleuchtungseinrichtung gemäß Anspruch 5 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.The object is achieved by a method according to claim 1 and a lighting device according to claim 5. Advantageous developments of the invention are the subject of the dependent claims.

Erfindungsgemäß ist nun eine Beleuchtungseinrichtung vorgesehen, die mehrere Lichtquellen, insbesondere LEDs, aufweist, wobei jede Lichtquelle Licht einer bestimmten Farbe bzw. eines bestimmten Wellenlängenbereiches abgibt, das sich vorzugsweise in der Farbe bzw. im Wellenlängenbereich vom Licht der anderen Lichtquellen unterscheidet. Bei den Lichtquellen handelt es sich somit um verschiedenfarbige, spektral engbandige Lichtquellen, wodurch die Beleuchtungseinrichtung in der Lage ist durch die Mischung des Lichtes der verschiedenen Lichtquellen Licht eines beliebigen Farbortes bzw. einer beliebigen Farbtemperatur abzugeben.According to the invention, a lighting device is now provided which has a plurality of light sources, in particular LEDs, wherein each light source emits light of a specific color or a specific wavelength range, which differs preferably in color or in the wavelength range from the light of the other light sources. The light sources are thus differently colored, spectrally narrow-band light sources, whereby the illumination device is able to emit light of any desired color location or any color temperature by mixing the light of the different light sources.

Des Weiteren ist erfindungsgemäß vorgesehen, dass die Beleuchtungseinrichtung Mittel aufweist, die die Reflexionseigenschaften eines zu beleuchtenden Objektes erfassen, wobei dann die Lichtabgabe der Lichtquellen in Abhängigkeit der Reflexionseigenschaften und eines minimalen Farbwiedergabewertes gesteuert wird. Der minimale Farbwiedergabewert wird hierbei über Bedienmittel, die an oder in der Beleuchtungseinrichtung angebracht sind, eingegeben. Die Lichtabgabe der Lichtquellen wird dann entsprechend von einer Steuereinheit gesteuert bzw. geregelt.Furthermore, the invention provides that the illumination device has means which detect the reflection properties of an object to be illuminated, in which case the light output of the light sources is controlled as a function of the reflection properties and a minimum color rendering value. The minimum color rendering value is input via operating means which are attached to or in the illumination device. The light output of the light sources is then controlled or regulated by a control unit.

Bei den Mitteln zur Erfassung der Reflexionseigenschaften handelt es sich vorzugsweise um eine Kamera, insbesondere eine Graustufen-Kamera oder um mehrere miteinander gekoppelte Graustufen-Sensoren.The means for detecting the reflection properties are preferably a camera, in particular a grayscale camera or a plurality of grayscale sensors coupled to one another.

Des Weiteren können auch Bedienmittel zur Eingabe eines Farbtemperaturwertes in oder an der Beleuchtungseinrichtung vorgesehen sein, wobei dann die Lichtabgabe der Lichtquellen zusätzlich auch in Abhängigkeit des Farbtemperaturwertes von der Steuereinheit gesteuert bzw. geregelt wird.Furthermore, operating means for inputting a color temperature value in or on the illumination device can also be provided, in which case the light output of the light sources is additionally controlled or regulated by the control unit as a function of the color temperature value.

Des Weiteren kann vorgesehen sein, dass zur Erfassung der Reflexionseigenschaften das Objekt von jeder Lichtquelle der Beleuchtungseinrichtung nacheinander einzeln beleuchtet wird und dabei jeweils die spektrale Antwort des Objektes erfasst wird. Hierbei beleuchtet jede Lichtquelle das Objekt zuerst mit einer hohen und dann mit einer niedrigen Intensität.Furthermore, provision can be made for the object of each light source of the illumination device to be illuminated individually one after the other in order to detect the reflection properties, and in each case the spectral response of the object is detected. Each light source illuminates the object first with a high and then with a low intensity.

Nachfolgend soll die Erfindung anhand von Ausführungsbeispielen und den beiliegenden Zeichnungen näher erläutert werden. Es zeigen:

Figur 1:
schematische Darstellung einer erfindungsgemäßen Beleuchtungseinrichtung;
Figur 2:
Wellenlängenbereiche der einzelnen Lichtquellen;
Figur 3:
Ansteuerung der einzelnen Lichtquellen und spektrale Antwort des Objekts;
Figur 4:
Steuerung der Lichtquellen aufgrund der Reflexionseigenschaften bei unterschiedlichen Farbwiedergabewerten;
The invention will be explained in more detail with reference to embodiments and the accompanying drawings. Show it:
FIG. 1:
schematic representation of a lighting device according to the invention;
FIG. 2:
Wavelength ranges of the individual light sources;
FIG. 3:
Activation of the individual light sources and spectral response of the object;
FIG. 4:
Controlling the light sources due to the reflection characteristics at different color rendering values;

Figur 1 zeigt eine erfindungsgemäße Beleuchtungseinrichtung 1, die mehrere Lichtquellen 2, eine Kamera 3, eine Steuereinheit 4 und verschiedene Bedienmittel 5 und 6 aufweist. Bei den Lichtquellen 2 handelt es sich um spektral engbandige Lichtquellen, die Licht in verschiedenen Farben bzw. verschiedenen Wellenlängenbereichen abgeben. In Figur 2 sind beispielhaft die Wellenlängenbereiche für vier verschiedene Lichtquellen dargestellt, wobei eine erste Lichtquelle insbesondere Licht in Blau und somit in einem Wellenlängenbereich zwischen 420 und 490nm, eine zweite Lichtquelle Licht in Grün und somit in einem Wellenlängenbereich zwischen 490 und 575nm, eine dritte Lichtquelle Licht in Orange und somit in einem Wellenlängenbereich zwischen 585 und 650nm und eine vierte Lichtquelle Licht in Rot und somit in einem Wellenlängenbereich zwischen 650 und 750nm, abgibt. FIG. 1 shows a lighting device 1 according to the invention, which has a plurality of light sources 2, a camera 3, a control unit 4 and various control means 5 and 6. The light sources 2 are spectrally narrow-band light sources that emit light in different colors or different wavelength ranges. In FIG. 2 For example, the wavelength ranges for four different light sources are shown, wherein a first light source in particular blue light and thus in a wavelength range between 420 and 490nm, a second light source in green and thus in a wavelength range between 490 and 575nm, a third light source orange light and thus in a wavelength range between 585 and 650 nm and a fourth light source emits light in red and thus in a wavelength range between 650 and 750 nm.

Erfindungsgemäß ist nun vorgesehen, dass zu Beginn der Beleuchtung eines Objektes durch die Beleuchtungseinrichtung 1 bzw. durch die Lichtquellen 2, eine Analyse der Eigenschaften des zu beleuchtenden Objektes durchgeführt wird. Hierbei sind insbesondere die Reflexionseigenschaften des Objektes für die vorliegende Erfindung relevant. Hierfür werden nacheinander alle Lichtquellen 2 aktiviert und deaktiviert, wobei jedes Mal die spektrale Antwort des Objektes durch die Kamera 3 erfasst wird, die innerhalb der Beleuchtungseinrichtung 1 derart angeordnet ist, dass sie in der Lage ist, das durch die Beleuchtungseinrichtung 1 zu beleuchtende Objekt zu erfassen bzw. aufzunehmen.According to the invention, it is now provided that, at the beginning of the illumination of an object by the illumination device 1 or by the light sources 2, an analysis of the properties of the object to be illuminated is performed. In particular, the reflection properties of the object are relevant to the present invention. For this purpose, all the light sources 2 are activated and deactivated one after the other, whereby each time the spectral response of the object is detected by the camera 3, which is arranged within the illumination device 1 in such a way that it is able to is to capture or record the object to be illuminated by the lighting device 1.

Bei der Verwendung von beispielsweise vier unterschiedlichen Lichtquellen 2, die die Wellenlängenbereiche, wie in Figur 2 gezeigt, aufweisen können, ist dann dementsprechend vorgesehen, dass jede Lichtquelle 2 einzeln und nacheinander das Objekt beleuchtet. Es wird z.B. die blaue Lichtquelle als Erste aktiviert, wobei alle anderen Lichtquellen deaktiviert sind. Die Kamera 3 erfasst dann die spektrale Antwort des Objektes auf das, von der blauen Lichtquelle abgestrahlte Licht. Hierbei ist nun vorzugsweise zusätzlich noch vorgesehen, dass die blaue Lichtquelle das Licht zuerst mit einer hohen Intensität und anschließend mit einer niedrigeren Intensität auf das Objekt abstrahlt, wobei die Kamera 3 jeweils in beiden Situationen die spektrale Antwort des Objektes erfasst. Durch diese Veränderung der Intensität, die bei allen Lichtquellen 2 im aktivierten Zustand erfolgt, ist es dann möglich, das Umgebungslicht bzw. Fremdlicht zu berücksichtigen bzw. dessen Einfluss auszuwerten.When using, for example, four different light sources 2, the wavelength ranges, as in FIG. 2 Accordingly, it is accordingly provided that each light source 2 individually and sequentially illuminates the object. For example, the blue light source will be activated first, with all other light sources disabled. The camera 3 then detects the spectral response of the object to the light emitted by the blue light source. In this case, it is preferably additionally additionally provided that the blue light source emits the light first with a high intensity and then with a lower intensity onto the object, wherein the camera 3 detects the spectral response of the object in each case. By this change of the intensity, which takes place with all light sources 2 in the activated state, it is then possible to consider the ambient light or extraneous light or to evaluate its influence.

Nachdem dann die blaue Lichtquelle zuerst Licht mit einer hohen und dann mit einer niedrigen Intensität auf das Objekt abgestrahlt hat, wird diese deaktiviert und die nächste Lichtquelle, beispielsweise die grüne Lichtquelle, aktiviert, wobei wiederum zuerst Licht mit einer hohen und dann anschließend mit einer niedrigen Intensität abgegeben wird und beide Male auch durch die Kamera 3 die entsprechende spektrale Antwort des Objektes erfasst bzw. aufgenommen wird.After the blue light source has first emitted light with a high and then with a low intensity on the object, this is deactivated and the next light source, for example the green light source, activated, again light first with a high and then with a low Intensity is emitted and both times by the camera 3, the corresponding spectral response of the object is detected or recorded.

Diese Vorgehensweise wird auch mit den anderen zwei Lichtquellen, der Orangen und Roten, fortgesetzt, um ebenfalls die spektrale Antwort des Objektes auf die entsprechende Farbe zu erhalten. In Figur 3 ist dieser Vorgang im oberen Diagramm dargestellt, wobei, wie bereits erläutert, jede Lichtquelle 2 einzeln und nacheinander aktiviert und deaktiviert wird und zusätzlich noch zuerst in einer hohen und dann in einer niedrigen Intensität Licht auf das Objekt abstrahlt. In dem unteren Diagramm in Figur 3 ist dann beispielhaft jeweils die spektrale Antwort auf das Licht der jeweiligen Lichtquelle 2 gezeigt, wobei aus diesem Diagramm der Unterschied zwischen der höheren und niedrigeren Intensität bei jeder Lichtquelle 2 gut zu erkennen ist.This procedure is also continued with the other two light sources, the oranges and the reds, to likewise obtain the spectral response of the object to the corresponding color. In FIG. 3 this process is shown in the upper diagram, wherein, as already explained, each light source 2 is activated and deactivated one by one and in succession and, in addition, first radiates light onto the object in a high and then in a low intensity. In the lower diagram in FIG. 3 In this case, the spectral response to the light of the respective light source 2 is shown by way of example in each case, the difference between the higher and lower intensity for each light source 2 being clearly recognizable from this diagram.

Das untere Diagramm in Figur 3 stellt nun die spektralen Antworten auf das Licht der verschiedenen Lichtquellen 2 für einen Pixel dar, da die Auswertung auch pixelweise erfolgt.The lower diagram in FIG. 3 now represents the spectral responses to the light of the different light sources 2 for a pixel, since the evaluation is also done pixel by pixel.

Auf diese Weise bzw. aus diesen Informationen ergeben sich dann insgesamt die Reflexionseigenschaften des Objektes bzw. die Reflexionseigenschaften jedes einzelnen Pixels der Kamera 3, die das Objekt entsprechend erfasst bzw. auswertet.In this way or from this information, the reflection properties of the object or the reflection properties of each individual pixel of the camera 3, which accordingly detects or evaluates the object, then result.

Bei dem in Figur 3 im unteren Diagramm gezeigten Informationen handelt es sich nun beispielsweise um einen Pixel, der einen relativ hohen Rotanteil, einen mittleren Blau-und Orangeanteil und einen niedrigen Grünanteil aufweist.At the in FIG. 3 The information shown in the lower diagram is, for example, a pixel having a relatively high proportion of red, a medium proportion of blue and orange and a low proportion of green.

Auf Basis dieser Informationen kann dann die Steuereinheit 4 ermitteln bzw. festlegen, welche spektralen Eigenschaften des zur späteren Beleuchtung verwendeten Lichts erforderlich sind, um einen gewünschten minimalen Farbwiedergabewert in Abhängigkeit des Objektes zu erzielen.On the basis of this information, the control unit 4 can then determine or determine which spectral properties of the light used for the subsequent illumination are required in order to achieve a desired minimum color rendering value as a function of the object.

Dieser gewünschte minimale Farbwiedergabewert kann über die als Schieberegler ausgebildeten Bedienmittel 5 von einem Benutzer ausgewählt werden. Hierbei können beispielsweise unterhalb des Schiebereglers Beschriftungen angebrachten sein, die das Verhältnis zwischen minimalem Farbwiedergabewert und Energieeinsparung zeigen.This desired minimum color rendering value can be selected by the user via the control means 5 designed as a slider. In this case, for example, under the slider, labels can be attached, showing the relationship between minimum color rendering value and energy conservation.

Die Steuereinheit 4 berechnet dann mit Hilfe der Reflexionseigenschaften des Objektes, welches Licht die Beleuchtungseinrichtung 1 abgeben muss, damit dieser minimale Lichtwiedergabewert für sämtliche Pixel erzielt wird, d.h., dass letztendliche Ergebnis orientiert sich an demjenigen Pixel, für das der niedrigste Farbwiedergabewert zumindest erreicht wird.The control unit 4 then calculates with the aid of the reflection properties of the object which light the illuminator 1 must emit in order to achieve this minimum light reproduction value for all pixels, that is to say that the final result is based on the pixel for which the lowest color rendering value is at least achieved.

In Figur 4 ist nun beispielhaft für die Farbwiedergabewerte 50, 90 und 100 eine entsprechende Ansteuerung der Lichtquellen 2 dargestellt, wobei die Kurve A jeweils die Reflexionseigenschaften des Objektes an einem Pixel zeigt, der mit den Reflexionseigenschaften aus dem unten in Figur 3 dargestellten Diagramm übereinstimmt. Die Kurven B, C und D zeigen dann jeweils in wieweit die Lichtquellen angesteuert werden müssen, um bei den gegebenenIn FIG. 4 is now exemplified for the color rendering values 50, 90 and 100, a corresponding control of the light sources 2 is shown, wherein the curve A respectively shows the reflection properties of the object at a pixel, with the reflection properties from the below in FIG. 3 corresponds to the diagram shown. The curves B, C and D then show in each case to what extent the light sources must be driven to the given

Reflexionseigenschaften des Pixels, die in der Kurve A dargestellt sind, den entsprechenden Farbwiedergabewert, hier entweder 50, 90 oder 100, zu erreichen, wobei die Kurve B für einen Farbwiedergabewert von 50, die Kurve C für einen Farbwiedergabewert von 90 und die Kurve D für einen Farbwiedergabewert von 100 vorgesehen ist. So ist beispielsweise bei einem Farbwiedergabewert von 50 insbesondere ein helles Leuchten der Lichtquellen blau und rot erforderlich.Reflection properties of the pixel shown in the curve A, the corresponding color rendering value, here either 50, 90 or 100, to reach, where the curve B for a color rendering value of 50, the curve C for a color rendering value of 90 and the curve D for a color rendering value of 100 is provided. For example, a color rendering value of 50 requires in particular a bright glow of the blue and red light sources.

Die Kurven B, C und D in Figur 4 sind durch die Steuereinheit 4 nun derart berechnet worden, dass diese jeweils insgesamt einer Farbtemperatur von 3000K entsprechen. Um auch die Einstellung der Farbtemperatur einem Benutzer der Beleuchtungseinrichtung 1 zu ermöglichen, weist diese weitere, als Schieberegler ausgebildete Bedienmittel 6 auf, durch die die Farbtemperatur des abgegebenen Lichtes eingestellt werden kann. Die Steuereinheit 4 berücksichtigt dann bei der Berechnung mit welchem Lichtanteil der minimale Farbwiedergabewert für sämtliche Pixel erzielt wird auch die eingestellte Farbtemperatur.The curves B, C and D in FIG. 4 have now been calculated by the control unit 4 so that they each correspond to a total color temperature of 3000K. In order to enable the setting of the color temperature of a user of the lighting device 1, this has further, designed as a slider control means 6, through which the color temperature of the emitted light can be adjusted. The control unit 4 then takes into account in the calculation with which light component the minimum color rendering value for all pixels is achieved also the set color temperature.

Insgesamt werden also mit dem erfindungsgemäßen Verfahren bzw. der erfindungsgemäßen Beleuchtungseinrichtung 1 die Farbeigenschaften eines zu beleuchtenden Objektes erkannt und mit diesen Informationen dann automatisch die verschiedenen Farbkanäle der Beleuchtungseinrichtung so angesteuert, dass das abgegebene Mischlicht im gewählten Farbtemperaturbereich liegt und die Farbwiedergabe derart auf die erkannten Farben angepasst ist, dass der Farbwiedergabewert größer oder gleich dem eingestellten minimalen Farbwiedergabewert ist. Hierdurch wird die erforderliche Energie der Beleuchtungseinrichtung 1 soweit wie möglich reduziert, da der Farbwiedergabewert in Abhängigkeit der Farben des Objektes eingestellt werden kann, wodurch eine größtmögliche Ersparnis erfolgt, da die Lichtquellen 2 nur so angesteuert werden, wie dies für den entsprechenden Farbwiedergabewert mindestens erforderlich ist.Overall, therefore, with the method according to the invention or the illumination device 1 according to the invention, the color properties of an object to be illuminated are detected and the different color channels of the illumination device are automatically controlled with this information such that the emitted mixed light lies in the selected color temperature range and the color reproduction is in such a manner dependent on the recognized colors is adjusted so that the color rendering value is greater than or equal to the set minimum color rendering value. As a result, the required energy of the lighting device 1 is reduced as much as possible, since the color rendering value can be adjusted depending on the colors of the object, whereby the greatest possible savings, since the light sources 2 are controlled only as at least required for the corresponding color rendering value ,

Hierbei ist zu beachten, dass je niedriger der gewünschte minimale Farbwiedergabewert über die Bedienmittel 5 eingestellt wird, desto größer die Energieeinsparung sein kann. So ist die Energieeinsparung bei dem linken Diagramm in Figur 4 am höchsten. Dementsprechend kann der Nutzer nun bestimmen, ob ein hoher Farbwiedergabewert oder aber eine hohe Energieeinsparung für ihn sinnvoll ist. Je mehr spektral engbandige Lichtquellen 2 verschiedener Spektralbereiche innerhalb der Beleuchtungseinrichtung nun zur Verfügung stehen, umso genauer können dann die Reflexionseigenschaften des zu beleuchtenden Objektes ermittelt werden.It should be noted that the lower the desired minimum color rendering value is set via the operating means 5, the greater the energy saving can be. So the energy saving is in the left diagram in FIG. 4 the highest. Accordingly, the user can now determine whether a high color rendering value or a high energy saving makes sense for him. The more spectrally narrowband light sources 2 of different spectral ranges within the illumination device are now available, the more accurate the reflection properties of the object to be illuminated can be determined.

Die Beleuchtungseinrichtung kann des Weiteren auch noch eine weiße oder mehrere weiße Lichtquellen aufweisen. Zusätzlich kann die Beleuchtungseinrichtung auch noch weitere bzw. alternative Eingabeelemente aufweisen, durch die eine Verstärkung (Helligkeitsanhebung) oder Abschwächung bestimmter leuchtenspezifisch vorgegebener Obj ektfarben unter der Beleuchtung eingestellt werden können.The illumination device can furthermore also have one white or several white light sources. In addition, the illumination device can also have further or alternative input elements, by means of which a gain (increase in brightness) or attenuation of specific light-specific predetermined object colors can be set under the illumination.

Claims (8)

Verfahren zur Beleuchtung eines Objekts mit mehreren in einer Beleuchtungseinrichtung (1) angeordneten Lichtquellen (2), insbesondere LEDs, wobei jede Lichtquelle (2) Licht einer bestimmten Farbe bzw. eines bestimmten Wellenlängenbereichs abgibt,
dadurch gekennzeichnet,
dass Mittel (3), die in der Beleuchtungseinrichtung (1) angeordnet sind, die Reflexionseigenschaften des Objekts erfassen und dass die Lichtabgabe der Lichtquellen (2) in Abhängigkeit der Reflexionseigenschaften und eines an der Beleuchtungseinrichtung (1) einstellbaren minimalen Farbwiedergabewerts gesteuert wird.Method for illuminating an object with a plurality of light sources (2) arranged in an illumination device (1), in particular LEDs, each light source (2) emitting light of a specific color or a specific wavelength range,
characterized,
in that means (3) arranged in the illumination device (1) detect the reflection properties of the object and that the light output of the light sources (2) is controlled as a function of the reflection properties and of a minimum color rendering value that can be set on the illumination device (1). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass sich das Licht jeder Lichtquelle (2) in der Farbe bzw. im Wellenlängenbereich vom Licht der anderen Lichtquellen (2) unterscheidet.Method according to claim 1,
characterized,
that the light of each light source (2) in the color or in the wavelength range differs from the light of the other light sources (2). Verfahren nach einem der Ansprüche 1-2,
dadurch gekennzeichnet,
dass zur Erfassung der Reflexionseigenschaften das Objekt von jeder Lichtquelle (2) nacheinander einzeln beleuchtet wird und dabei jeweils die spektrale Antwort des Objekts erfasst wird.Method according to one of claims 1-2,
characterized,
in that the object of each light source (2) is successively illuminated one after the other in order to detect the reflection properties, and the spectral response of the object is detected in each case. Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
dass jede Lichtquelle (2) zuerst mit einer hohen Intensität und dann mit einer niedrigen Intensität das Objekt beleuchtet.Method according to claim 3,
characterized,
that each light source (2) illuminates the object first with a high intensity and then with a low intensity. Beleuchtungseinrichtung (1) mit mehreren Lichtquellen (2), insbesondere LEDs, wobei jede Lichtquelle (2) Licht einer bestimmten Farbe bzw. eines bestimmten Wellenlängenbereichs abgeben kann,
dadurch gekennzeichnet,
dass die Beleuchtungseinrichtung (1) Mittel (3) zur Erfassung der Reflexionseigenschaften eines durch die Beleuchtungseinrichtung (1) zu beleuchtenden Objekts, Bedienmittel (5) zur Eingabe eines minimalen Farbwiedergabewertes und eine Steuereinheit (4) zur Steuerung der Lichtquellen (2) aufweist, wobei die Steuereinheit (4) derart ausgebildet ist, dass die Lichtabgabe der Lichtquellen (2) in Abhängigkeit der Reflexionseigenschaften und des minimalen Farbwiedergabewerts gesteuert wird.Lighting device (1) with a plurality of light sources (2), in particular LEDs, wherein each light source (2) can emit light of a specific color or a specific wavelength range,
characterized,
in that the illumination device (1) has means (3) for detecting the reflection properties of an object to be illuminated by the illumination device (1), operating means (5) for inputting a minimum color rendering value and a control unit (4) for controlling the light sources (2) the control unit (4) is designed such that the light output of the light sources (2) is controlled as a function of the reflection properties and of the minimum color rendering value. Beleuchtungseinrichtung nach Anspruch 5,
dadurch gekennzeichnet,
das sich das Licht jeder Lichtquelle (2) in der Farbe bzw. im Wellenlängenbereich vom Licht der anderen Lichtquellen (2) unterscheidet.Lighting device according to claim 5,
characterized,
that differs the light of each light source (2) in the color or in the wavelength range from the light of the other light sources (2). Beleuchtungseinrichtung nach Anspruch 5,
dadurch gekennzeichnet,
dass es sich bei den Mitteln zur Erfassung der Reflexionseigenschaft um eine Kamera (3), insbesondere eine Graustufen-Kamera, oder mehrere miteinander gekoppelte Graustufen-Sensoren handelt.Lighting device according to claim 5,
characterized,
in that the means for detecting the reflection property are a camera (3), in particular a grayscale camera, or a plurality of grayscale sensors coupled to one another. Beleuchtungseinrichtung nach einem der Ansprüche 5-6,
dadurch gekennzeichnet,
dass die Beleuchtungseinrichtung (1) Bedienmittel (6) zur Eingabe eines Farbtemperaturwerts aufweist, wobei die Steuereinheit (4) zusätzlich derart ausgebildet ist, dass die Lichtabgabe der Lichtquellen (2) auch in Abhängigkeit des Farbtemperaturwerts gesteuert wird.Lighting device according to one of claims 5-6,
characterized,
in that the lighting device (1) has operating means (6) for inputting a color temperature value, wherein the control unit (4) is additionally designed such that the light output of the light sources (2) is also controlled as a function of the color temperature value.
EP12150054.0A 2011-01-04 2012-01-03 Method and lighting device for lighting an object with multiple light sources Active EP2473008B1 (en)

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US9345099B2 (en) 2012-07-27 2016-05-17 Koninklijke Philips N.V. Color emphasis and preservation of objects using reflection spectra
US9635730B2 (en) 2012-07-27 2017-04-25 Philips Lighting Holding B.V. Color emphasis and preservation of objects using reflection spectra
EP3460999A1 (en) * 2017-09-25 2019-03-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method and assembly for large-surface testing of optical properties of a layer
WO2019246431A1 (en) * 2018-06-22 2019-12-26 Lumileds Llc Lighting system with integrated sensor
US10582589B2 (en) 2018-06-22 2020-03-03 Lumileds Llc Lighting system with integrated sensor
US10893590B2 (en) 2018-06-22 2021-01-12 Lumileds Llc Lighting system with integrated sensor
US11382195B2 (en) 2018-06-22 2022-07-05 Lumileds Llc Lighting system with integrated sensor

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