EP2473008B1 - Procédé et dispositif d'éclairage pour l'éclairage d'un objet avec plusieurs sources de lumière - Google Patents

Procédé et dispositif d'éclairage pour l'éclairage d'un objet avec plusieurs sources de lumière Download PDF

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Publication number
EP2473008B1
EP2473008B1 EP12150054.0A EP12150054A EP2473008B1 EP 2473008 B1 EP2473008 B1 EP 2473008B1 EP 12150054 A EP12150054 A EP 12150054A EP 2473008 B1 EP2473008 B1 EP 2473008B1
Authority
EP
European Patent Office
Prior art keywords
light
lighting device
light sources
light source
color
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.)
Active
Application number
EP12150054.0A
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German (de)
English (en)
Other versions
EP2473008A2 (fr
EP2473008A3 (fr
Inventor
Martin Kenneth
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 Austria
Original Assignee
Zumtobel Lighting GmbH Austria
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Application filed by Zumtobel Lighting GmbH Austria filed Critical Zumtobel Lighting GmbH Austria
Publication of EP2473008A2 publication Critical patent/EP2473008A2/fr
Publication of EP2473008A3 publication Critical patent/EP2473008A3/fr
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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 publication WO2006 / 114725 A1 discloses an illumination system for generating a desired color temperature.
  • a minimum color rendering value is usually desired.
  • 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.
  • the object is achieved by a method according to claim 1 and a lighting device according to claim 5.
  • 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.
  • each light source of the illumination device is successively illuminated individually for detection of the reflection properties and the spectral response of the object is detected in each case.
  • Each light source illuminates the object first with a high and then with a low intensity
  • 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.
  • 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 bottom diagram is a pixel that has a relatively high proportion of red, a medium proportion of blue and orange, and a low amount 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 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.
  • 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 luminaire-specific predetermined object colors can be set under the illumination.

Landscapes

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

Claims (6)

  1. Procédé destiné à l'éclairage d'un objet avec plusieurs sources de lumière (2) disposées dans un dispositif d'éclairage (1), en particulier des LED, chaque source de lumière (2) émettant de la lumière d'une couleur définie ou respectivement d'une plage de longueurs d'onde définie,
    caractérisé en ce que
    des moyens (3) qui sont disposés dans le dispositif d'éclairage (1) détectent les caractéristiques de réflexion de l'objet, et en ce que l'émission de lumière des sources de lumière (2) est commandée en fonction des caractéristiques de réflexion et d'un indice de rendu des couleurs minimal réglable sur le dispositif d'éclairage (1), l'objet de chaque source de lumière (2) étant, pour la détection des caractéristiques de réflexion, éclairé individuellement l'un après l'autre, et la réponse spectrale de l'objet étant en l'occurrence détectée respectivement, et chaque source de lumière (2) éclairant l'objet d'abord avec une intensité élevée et puis avec une intensité faible.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la lumière de chaque source de lumière (2) se distingue de la lumière des autres sources de lumière (2) par la couleur ou respectivement par la plage de longueurs d'onde.
  3. Dispositif d'éclairage (1) avec plusieurs sources de lumière (2), en particulier des LED, chaque source de lumière (2) pouvant émettre de la lumière d'une couleur définie ou respectivement d'une plage de longueurs d'onde définie
    caractérisé en ce que
    le dispositif d'éclairage (1) comporte des moyens (3) destinés à la détection des caractéristiques de réflexion d'un objet devant être éclairé par le dispositif d'éclairage (1), des moyens de commande (5) destinés à l'entrée d'un indice de rendu des couleurs minimal et une unité de commande (4) destinée à la commande des sources de lumière (2), l'unité de commande (4) étant constituée de telle sorte que l'émission de lumière des sources de lumière (2) est commandée en fonction des caractéristiques de réflexion et de l'indice de rendu des couleurs minimal, l'objet de chaque source de lumière (2) étant, pour la détection des caractéristiques de réflexion, éclairé individuellement l'un après l'autre, et la réponse spectrale de l'objet étant en l'occurrence détectée respectivement, et chaque source de lumière (2) éclairant l'objet d'abord avec une intensité élevée et puis avec une intensité faible.
  4. Dispositif d'éclairage selon la revendication 3,
    caractérisé en ce que
    la lumière de chaque source de lumière (2) se distingue de la lumière des autres sources de lumière (2) par la couleur ou respectivement par la plage de longueurs d'onde.
  5. Dispositif d'éclairage selon la revendication 3,
    caractérisé en ce que,
    concernant les moyens destinés à la détection des caractéristiques de réflexion, il s'agit d'une caméra (3), en particulier d'une caméra à niveaux de gris, ou de plusieurs capteurs de niveaux de gris couplés les uns aux autres.
  6. Dispositif d'éclairage selon l'une des revendications 3 à 4,
    caractérisé en ce que
    le dispositif d'éclairage (1) comporte des moyens de commande (6) destinés à l'entrée d'un indice de température de couleur, l'unité de commande (4) étant en plus constituée de telle sorte que l'émission de lumière des sources de lumière (2) est commandée également en fonction de l'indice de température de couleur.
EP12150054.0A 2011-01-04 2012-01-03 Procédé et dispositif d'éclairage pour l'éclairage d'un objet avec plusieurs sources de lumière Active EP2473008B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011002437A DE102011002437A1 (de) 2011-01-04 2011-01-04 Verfahren und Beleuchtungseinrichtung zur Beleuchtung eines Objektes mit mehreren Lichtquellen

Publications (3)

Publication Number Publication Date
EP2473008A2 EP2473008A2 (fr) 2012-07-04
EP2473008A3 EP2473008A3 (fr) 2016-08-17
EP2473008B1 true EP2473008B1 (fr) 2019-03-13

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Application Number Title Priority Date Filing Date
EP12150054.0A Active EP2473008B1 (fr) 2011-01-04 2012-01-03 Procédé et dispositif d'éclairage pour l'éclairage d'un objet avec plusieurs sources de lumière

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EP (1) EP2473008B1 (fr)
DE (1) DE102011002437A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2015106702A (ru) 2012-07-27 2016-09-20 Конинклейке Филипс Н.В. Цветовое выделение и сохранение объектов с использованием спектров отражения
EP3460999B1 (fr) * 2017-09-25 2019-08-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procédé et agencement d'essai à grande surface de propriétés optiques d'une couche
US10582589B2 (en) 2018-06-22 2020-03-03 Lumileds Llc Lighting system with integrated sensor
WO2019246431A1 (fr) * 2018-06-22 2019-12-26 Lumileds Llc Sytème d'éclairage doté d'un capteur intégré

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JP5160411B2 (ja) * 2005-04-28 2013-03-13 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 改良された照明システム
CN101185375B (zh) * 2005-05-25 2010-06-16 皇家飞利浦电子股份有限公司 使用led提供白光的照明系统和方法
DE102007002382A1 (de) * 2007-01-10 2008-07-24 Zett Optics Gmbh Beleuchtungsanordnung und Beleuchtungsverfahren
EP2031295A1 (fr) * 2007-08-29 2009-03-04 Asetronics AG Eclairage d'examen médical, en particulier dentaire
DE102008055949B4 (de) * 2008-11-05 2010-12-23 Siemens Aktiengesellschaft Optische Erfassungseinheit für Objekte

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Publication number Publication date
EP2473008A2 (fr) 2012-07-04
DE102011002437A1 (de) 2012-07-05
EP2473008A3 (fr) 2016-08-17

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