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WO2016020323A1 - Agencement d'éclairage à suppression de couleur d'extrémité - Google Patents

Agencement d'éclairage à suppression de couleur d'extrémité Download PDF

Info

Publication number
WO2016020323A1
WO2016020323A1 PCT/EP2015/067816 EP2015067816W WO2016020323A1 WO 2016020323 A1 WO2016020323 A1 WO 2016020323A1 EP 2015067816 W EP2015067816 W EP 2015067816W WO 2016020323 A1 WO2016020323 A1 WO 2016020323A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
color
center
light sources
light source
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.)
Ceased
Application number
PCT/EP2015/067816
Other languages
English (en)
Inventor
Tewe Hiepke Heemstra
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips NV filed Critical Koninklijke Philips NV
Publication of WO2016020323A1 publication Critical patent/WO2016020323A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present disclosure relates to an elongated lighting arrangement having light sources emitting light of different colors.
  • LED lamp exemplifying this technique is disclosed in US 8,376,602 B2.
  • the LED lamp may include several differently colored LEDs, the light from which is combined to form white light.
  • the general object of the present disclosure is to provide an improved or alternative lighting arrangement, the illumination from which is a mixture of the light from several light sources of different colors.
  • nonuniform color may be a particularly pertinent problem by the ends of an elongated lighting arrangement due to insufficient mixing of the light emitted by the end light sources.
  • An aspect of particular interest is therefore to reduce discolorations by the ends of elongated lighting arrangements of this type, such as a tubular LED lamp providing white illumination light.
  • a lighting arrangement comprises: an elongated carrier defining a longitudinal direction and having a center portion arranged between two longitudinally separated end portions, two or more center light sources arranged in a pattern having an extension in the longitudinal direction on the center portion; and at least one end light source arranged on at least one of the two end portions.
  • the center light sources comprise at least one light source configured to emit light having a first color and at least one light source configured to emit light having a second color which is different from the first color.
  • the at least one end light source is configured to emit light having a color which is different from the first and second colors.
  • Providing an end of the arrangement of light sources with a light source of a different color than the center light sources may help suppress color variations in the light emitted by that end.
  • An efficient way to suppress color variations is to have the color of the light emitted by the at least one end light source being equal to the average color of the light emitted by the center light sources.
  • Color variations may also be efficiently suppressed by adapting the color of the light emitted by the at least one end light source to the color of the light emitted by the closest center light source, i.e. the center light source that is closest to the at least one end light source.
  • the color of the light emitted by the at least one end light source may be slightly shifted away from the average color in order to compensate for the color of the light emitted by the closest center light source.
  • it may be advantageous to adapt the light emitted by the at least one end light source to the color of the light emitted by the closest center light sources, for example the two, three or four closest center light sources.
  • the light emitted by any two neighboring center light sources may have different colors.
  • Each center light source may be configured to emit light having either the first color or the second color.
  • the first color and the second color are typically two colors of light that combine to form white light.
  • the first color may for example be red and the second color may be greenish-yellow so that the lighting arrangement provides white illumination light.
  • Other combinations of two colors are of course possible.
  • the first color may be red, and the second color and associated flux may be chosen such that the average resulting color is near the black body curve.
  • the center light sources and the end light sources may be solid-state lighting devices, such as semiconductor light-emitting diodes, organic light emitting diodes or polymer light emitting diodes. Many further variants of the lighting arrangement are conceivable.
  • the center light sources and the at least one end light sources may form a single straight line. At least one end light source can be arranged on each of the two end portions.
  • the lighting arrangement may comprise a housing which encloses the center light sources and the end light sources.
  • the housing may be tubular.
  • the housing may for example be a straight tube or a curved tube.
  • the housing usually has a light-transmissive portion arranged to receive light emitted by the center light sources and the end light sources.
  • the light- transmissive portion may be configured to diffuse the light emitted by the center light sources and the end light sources.
  • Fig. 1 is a schematic cutaway view in perspective of a lighting arrangement.
  • Fig. 2 is a schematic illustration of a CIE 1931 color space chromaticity diagram.
  • the lighting arrangement 1 shown in Figure 1 includes a tubular housing 2.
  • the shape of the housing 2 in figure 1 is that of a straight tube having a circular transverse cross section, but other shapes and cross sections are conceivable.
  • the housing 2 may have the shape of a curved tube, for instance.
  • the transverse cross section of the housing 2 may be U-shaped.
  • the length 1 of the housing 2 may be between a few centimeters and several meters, for example between 50 centimeters and 1.5 meters.
  • the diameter d of the housing 2 may be in the range from 1 centimeter to 10 centimeters, for example between 2 centimeters and 4 centimeters.
  • the housing 2 is adapted to transmit light and thus may comprise a light- transmissive portion 3.
  • the housing 2 can for example be made of plastics or glass that transmits light.
  • the light-transmissive portion 3 is typically provided with means for diffusing light, for example a light-diffusing layer 12.
  • the light-transmissive portion 3 may be provided with a collimator, such as a lens.
  • One or more connectors 4 for connecting to a mains electricity supply, or some other electrical power source, may be attached to the housing 2.
  • a connector 4 is attached to each of the two ends of the housing 2 in figure 1.
  • Each connector 4 may have one or more pins 5 for inserting into a power socket.
  • the housing 2 encloses, either partly or completely, an elongated carrier 6 defining a longitudinal direction L.
  • the carrier 6 has two end portions 7 which are separated in the longitudinal direction L.
  • a center portion 8 of the carrier 6 is arranged between the two end portions 7.
  • the carrier 6 may be a circuit board, for example a printed circuit board or a wired circuit board.
  • the carrier 6 may be in thermal contact with a heat sink 9 for transferring heat away from the carrier 6.
  • the carrier 6 may for example be arranged on the heat sink 9.
  • the heat sink 9 may be formed by the housing 2.
  • the carrier 6 provides electrical circuitry for several light sources which are mounted on the carrier 6.
  • the light sources include two or more center light sources 10, which are arranged on the center portion 8, and at least one end light source 1 1 arranged on one of the end portions 7.
  • each of the two end portions 7 is provided with one end light source 1 1.
  • An example of an alternative embodiment is that of two or more end light sources being arranged on each of the two end portions 7.
  • Another example is that of only one of the end portions 7 being provided with one or more end light sources 1 1.
  • the center light sources 10 are arranged on the center portion 8 in a pattern having an extension in the longitudinal direction L.
  • the center light sources 10 may for example be arranged along a slightly curved line or in a zigzag pattern.
  • the center light sources 10 form a single straight line. Other possible embodiments include those in which the center light sources 10 form two or more straight lines.
  • the center 10 and end 1 1 light sources are enclosed by the housing 2 so that light emitted by the center 10 and end 1 1 light sources is received by the light-transmissive portion 3.
  • the center 10 and end 1 1 light sources are typically solid-state lighting devices, such as semiconductor light-emitting diodes, organic light emitting diodes or polymer light emitting diodes.
  • the center light sources 10 emit light of more than one color. To be more precise, at least one of the center light sources 10 is configured to emit light of a first color and at least one center light sources 10 is configured to emit light of a different, second color.
  • each of the center light sources 10 is configured to emit either the first color or the second color.
  • the center light sources 10 may be arranged on the carrier 6 so that any two neighboring light sources are of different colors. If the center light sources 10 are arranged along a straight line and each center light source 10 is configured to emit light having either the first or the second color, the center light sources 10 may be alternately arranged. That is to say, every other center light source 10 may emit light of the first color while the remaining center light sources 10 emit light of the second color.
  • the end light sources 1 1 are configured to emit light having a different color than the first and second colors.
  • the color of the light emitted by each of the end light sources 1 1 may for example be the average color of the light emitted by the center light sources 10. However, all of the end light sources 1 1 do not have to emit light of the same color.
  • the color of an end light source 1 1 may be adapted to, or selected based on, the color of the closest center light source 10, alternatively two or more of the closest center light sources 10.
  • an end light source 1 1 whose closest center light source 10 emits light of the first color may emit light having a color that is slightly shifted away from the average color and the first color.
  • an end light source 1 1 whose closest center light source 10 emits light of the second color may emit light having a color that is slightly shifted away from the average color and the second color.
  • Factors influencing which end light source color minimizes the color variation over the length of the lighting arrangement 1 include the shapes of the light spots on the light-transmissive portion 3 and the reflective properties of the inside ends of the housing 2.
  • the first and second colors may be any two colors. Usually, the first and second colors are such that the lighting arrangement 1 provides white illumination light.
  • the first color and the second color can for example be greenish-yellow and red, respectively.
  • greenish-yellow light is meant light having a dominant wavelength in the range from about 515 nm to about 558 nm.
  • red light is meant light having a dominant wavelength larger than about 620 nm.
  • the dominant wavelength represents the color perceived by the eye and may be derived from a CIE color space chromaticity diagram.
  • the light emitted by any of the center 10 and end 1 1 light sources comprises a spectrum of
  • the lighting arrangement 1 When the lighting arrangement 1 is in use, electricity is transmitted via the connector 4 and the carrier 6 to the center 10 and end 1 1 light sources which thereby emit light. The emitted light mixes to form, for example, white light. The light transmitted through the light-transmissive portion 3 of the housing 2 provides illumination. The light emitted by the end light sources 1 1 helps reduce color variations that might have appeared in the light emitted by the two ends of the lighting arrangement 1 had the lighting arrangement 1 only had the center light sources 10.
  • a common way of defining color is with respect to a CIE color space, such as the CIE 1931 XYZ color space.
  • CIE color space such as the CIE 1931 XYZ color space.
  • the color and flux of the light emitted by a light source is represented by the so-called tristimulus values X, Y and Z, from which two chromaticity coordinates (here denoted by x and y) may be derived.
  • a color may be specified by its chromaticity coordinates and graphically represented by a point in a CIE 1931 color space chromaticity diagram.
  • the average color of two colors is, in such a diagram, specified by a point lying on the straight line connecting the two points representing the two colors.
  • the color point of the mixed light does not have to equidistant from both contributing color points.
  • the color of the light emitted by the end light sources 1 1 may not be exactly equal to said average color. More precisely, the color emitted by the end light sources 1 1 may deviate from the average color within certain bounds related to MacAdam numbers, while keeping the luminance of the lighting arrangement 1 near the average luminance. Knowing the light spot shape of all the center 10 and end 1 1 light sources, and keeping the flux of each light source about equal to the average light source flux, it is possible to determine the chromaticity coordinate of the end light sources 1 1 that minimizes the perceived severity of the variation in color of the light emitted by the lighting arrangement 1.
  • the chromaticity values x and y of the light emitted by all of the center light sources 10 may be derived from the sum of the tristimulus values X, Y and Z of each center light source 10.
  • the tristimulus values of a light source may be derived from its spatially integrated emission spectrum.
  • the average color of the light emitted by the center light sources 10 may be determined by measuring their combined spatially integrated emission spectrum, e.g. in an integrating sphere measuring system. It is also possible to measure the color of the surface of the light- transmissive portion 3 using a spectroradiometer or a color measuring video photometer.
  • the center 10 and end 1 1 light sources may be laser diodes the light from which is properly diffused.
  • variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims.
  • the word “comprising” does not exclude other elements or steps
  • the indefinite article "a” or “an” does not exclude a plurality.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

Landscapes

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

Abstract

L'invention concerne un agencement d'éclairage (1). L'agencement d'éclairage comprend un support allongé (6) définissant une direction longitudinale (L) et comprenant une partie centrale (8) agencée entre deux parties d'extrémité (7) longitudinalement séparées, au moins deux sources de lumière centrales (10) agencées en une configuration ayant une extension dans la direction longitudinale (L) sur la partie centrale (8) ; et au moins une source de lumière d'extrémité (11) agencée sur au moins une des deux parties d'extrémité (7). Les sources de lumière centrales (10) comprennent au moins une source de lumière conçue pour émettre de la lumière ayant une première couleur et au moins une source de lumière conçue pour émettre de la lumière ayant une deuxième couleur qui est différente de la première couleur. L'au moins une source de lumière d'extrémité (11) est conçue pour émettre de la lumière ayant une couleur qui est différente des première et deuxième couleurs.
PCT/EP2015/067816 2014-08-05 2015-08-03 Agencement d'éclairage à suppression de couleur d'extrémité Ceased WO2016020323A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14179898 2014-08-05
EP14179898.3 2014-08-05

Publications (1)

Publication Number Publication Date
WO2016020323A1 true WO2016020323A1 (fr) 2016-02-11

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ID=51265597

Family Applications (1)

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PCT/EP2015/067816 Ceased WO2016020323A1 (fr) 2014-08-05 2015-08-03 Agencement d'éclairage à suppression de couleur d'extrémité

Country Status (1)

Country Link
WO (1) WO2016020323A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006189665A (ja) * 2005-01-06 2006-07-20 Citizen Electronics Co Ltd 発光ダイオードを用いたｌｃｄバックライト
US20070253216A1 (en) * 2006-04-28 2007-11-01 Hitachi Display, Ltd. LED backlight and liquid crystal display device using thereof
WO2009109387A1 (fr) * 2008-03-06 2009-09-11 Mbb International Group Ag Luminaire permettant en particulier d'obtenir un spectre lumineux analogue à la lumière du jour
GB2460228A (en) * 2008-05-20 2009-11-25 Mode Lighting Vivarium Illumination System
DE102011000657A1 (de) * 2011-02-11 2012-08-16 Andree Jahnel Beleuchtungsleiste
US20120300452A1 (en) * 2011-08-02 2012-11-29 Xicato, Inc. Led-based illumination module with preferentially illuminated color converting surfaces
US20130003409A1 (en) * 2010-03-18 2013-01-03 Koninklijke Philips Electronics, N.V. light mixing module, and a luminaire comprising such a light mixing module
WO2013174841A1 (fr) * 2012-05-22 2013-11-28 Robertus Gerardus Alferink Luminaire à del, à utiliser dans des étables de bovins laitiers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006189665A (ja) * 2005-01-06 2006-07-20 Citizen Electronics Co Ltd 発光ダイオードを用いたｌｃｄバックライト
US20070253216A1 (en) * 2006-04-28 2007-11-01 Hitachi Display, Ltd. LED backlight and liquid crystal display device using thereof
WO2009109387A1 (fr) * 2008-03-06 2009-09-11 Mbb International Group Ag Luminaire permettant en particulier d'obtenir un spectre lumineux analogue à la lumière du jour
GB2460228A (en) * 2008-05-20 2009-11-25 Mode Lighting Vivarium Illumination System
US20130003409A1 (en) * 2010-03-18 2013-01-03 Koninklijke Philips Electronics, N.V. light mixing module, and a luminaire comprising such a light mixing module
DE102011000657A1 (de) * 2011-02-11 2012-08-16 Andree Jahnel Beleuchtungsleiste
US20120300452A1 (en) * 2011-08-02 2012-11-29 Xicato, Inc. Led-based illumination module with preferentially illuminated color converting surfaces
WO2013174841A1 (fr) * 2012-05-22 2013-11-28 Robertus Gerardus Alferink Luminaire à del, à utiliser dans des étables de bovins laitiers

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