WO2011045720A1 - Dispositif d'éclairage comprenant une chambre de mélange - Google Patents

Dispositif d'éclairage comprenant une chambre de mélange Download PDF

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Publication number
WO2011045720A1
WO2011045720A1 PCT/IB2010/054577 IB2010054577W WO2011045720A1 WO 2011045720 A1 WO2011045720 A1 WO 2011045720A1 IB 2010054577 W IB2010054577 W IB 2010054577W WO 2011045720 A1 WO2011045720 A1 WO 2011045720A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting device
exit windows
mixing chamber
reflective wall
exit
Prior art date
Application number
PCT/IB2010/054577
Other languages
English (en)
Inventor
Denis Joseph Carel Van Oers
Joris Jan Vrehen
Berend Jan Willem Ter Weeme
Original Assignee
Koninklijke Philips Electronics N.V.
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 Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2011045720A1 publication Critical patent/WO2011045720A1/fr

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
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • 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
    • F21K9/62—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using mixing chambers, e.g. housings with reflective walls
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/08—Combinations of only two kinds of elements the elements being filters or photoluminescent elements and reflectors
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/10—Refractors for light sources comprising photoluminescent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • 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 invention relates to a lighting device comprising solid state light source and a mixing chamber.
  • Lighting devices such as household lamps or street light, for illuminating its surroundings conventionally comprises inter alia a light source and an exit window, such as a translucent globe of a traditional incandescent lamp.
  • solid state light sources such as light emitting diodes, LEDs
  • LEDs are increasingly used in all types of lighting devices, due to for example their higher efficiency.
  • An example of an illumination device comprising a LED is described in WO2009/093163.
  • several LEDs are arranged in a mixing chamber having reflective inner walls and a translucent diffusive exit window. Light from the LEDs that reaches the exit window is partially transmitted and partially reflected back into the mixing chamber. Thereby a mixing of light is provided.
  • the exit window may also be provided with a color converting luminescent layer (e.g. phosphor), sometimes referred to as "remote phosphor".
  • a color converting luminescent layer e.g. phosphor
  • a lighting device comprising a mixing chamber and at least one solid state light source arranged in the mixing chamber.
  • the mixing chamber is enclosed by at least two diffusive exit windows, and at least one reflective wall, and the solid state light source and the diffusive exit windows are arranged in relation to each other such that less than half of light that is reflected by one of the diffusive exit windows is directed toward the at least one reflective wall.
  • the present invention is based on the realization that the efficacy of the lighting device can be increased by having at least two exit windows, and by arranging them in relation to each other and to the at least one LED so that a larger part of the light that is reflected into the mixing chamber by one exit window is aimed at the other exit window.
  • the different exit windows cause peak intensities of transmitted light in different directions, and may be directed to achieve a desired light distribution. That is, the light from the lighting device may illuminate a relatively large area, or several different areas.
  • the diffusive exit windows may comprise a translucent material, such as an organic material, for example polyethylene or polycarbonate, or an inorganic material, for example glass or ceramics.
  • the diffusive exit windows may comprise a luminescent material.
  • a luminescent material may be phosphor, whereby, a part of the converted light will be converted to longer wavelengths. If the LEDs are blue, the exit window with phosphor will scatter the blue and converted light partially outward and partially inward back into the mixing chamber.
  • a white light source may be made. The efficiency of a remote phosphor system may be made much higher compared to white LEDs.
  • the luminescent material may be added to the exit windows, i.e. the luminescent material particles may be mixed with the material of the exit windows.
  • two of the diffusive exit windows may extend from the reflective wall at an angle toward each other, so as to form a tapered end of the mixing chamber.
  • the mixing chamber will thus have a generally triangular cross section.
  • Such a form is favorable in that it may simplify the redirection of light to the second exit window after reflection in the first exit window.
  • the two exit windows moreover may behave as a so called Lambertian radiator, wherein the highest intensity may be found perpendicular to the surface. This feature may be used to direct the peak intensities of light transmitted through the two exit windows to illuminate two different regions of a surface, so as to for example illuminate a street in a uniform manner.
  • the angle between the exit windows in the tapered end may moreover be selected to determine the location of the maximum intensity.
  • the exit windows may have equal size and shape, so that the cross section is an isosceles triangle.
  • the exit windows may be connected to each other in the tapered end by an intermediate reflective wall portion.
  • the intermediate reflective wall portion may be a thin portion for merely attaching the exit windows at the tapered end, or a broader wall portion rendering the triangular cross section of the mixing chamber truncated.
  • the intermediate reflective wall portion may be selected in order to regulate the location of the maximum intensity as well as the total intensity and efficacy of the lighting device, depending on toward which direction the wall portion is reflecting light.
  • the intermediate reflective wall portion may protrude into the mixing chamber, such that the intermediate reflective wall portion is not parallel to the opposite reflective wall.
  • a protruding intermediate reflective wall portion may be advantageous, by increasing the intensity of the lighting device, since it may direct reflected light toward either one of the exit windows.
  • the shape of the intermediate wall portion may be triangular, whereby one of its sides reflects light toward one of the two exit windows, and the other of its sides reflects light toward the other one of the two exit windows.
  • the at least two exit windows may be curved, which may be advantageous and increase the efficiency even more. Curved exit windows may relatively easily be adapted to produce an improved light distribution, resulting in a more efficient lighting device.
  • the internal efficiency of the mixing chamber may be improved since a larger part of a projection of the solid state light source on the plane of the exit windows may lie outside the exit windows.
  • the solid state light source may be mounted directly on the reflective wall, which may be advantageous due to that only a small part of the light hits the light source, where it is absorbed.
  • each exit window may be located in a plane such that a larger part of a projection of the solid state light source on this plane lies outside the exit window.
  • the intermediate reflective wall portion may, in addition or alternatively, be located in a plane such that a larger part of a projection of the solid state light source on this plane lies outside the intermediate reflective wall portion.
  • Fig. 1 is a perspective view of a lighting device arranged as a street lamp
  • Fig. 2 is a partly broken away perspective view of a lighting device according to the present invention.
  • Fig. 3 is a cross-section of a lighting device according to the present invention.
  • Fig. 4 is a cross-section of a lighting device according to the present invention, with a protruding reflecting wall portion.
  • Fig. 5 is a cross-section of a lighting device according to the present invention, with curved exit windows.
  • Fig. 6 is a cross-section of another example of a lighting device according to the present invention.
  • Fig. 7 is a perspective view of another example of a lighting device according to the present invention.
  • fig 1 illustrates a street lamp having a lighting device 10 which is secured to a pole 11 that is located by a street 12.
  • the lighting device 10 comprises at least two translucent diffusive exit windows 2, 3 and at least one reflective wall 4 arranged to enclose a mixing chamber 1.
  • the lighting device has a reflective base wall 4 and two exit windows to give the mixing chamber an essentially triangular cross-section.
  • the lighting device further has a thin reflective wall portion 5 that connects the exit windows 2, 3 in the tapered end of the mixing chamber 1, and two reflective walls 7, 8 that in the illustrated example are triangular and closes both triangular ends of the lighting device 10.
  • the lighting device 10 is arranged on the pole 11 so that the tapered end of the mixing chamber 1 faces the street 12.
  • An array of solid state light sources, such as light emitting diodes, LEDs, (not shown in fig. 1) is arranged inside the mixing chamber 1.
  • the lighting device is described in more detail in relation to fig. 2, which is a partly broken away perspective view.
  • the LEDs 6 are arranged on a PCB plate 14 having a reflective surface to serve as a reflective wall 4.
  • the array of LEDs 6 extends on the PCB plate 14 along the length of the lighting device 10.
  • the LEDs 6 could for example be arranged more centrally or elsewhere in the mixing chamber 1 , by for example connectively suspending it at a distance from the PCB, yet producing an evenly distributed light toward the exit windows 2, 3.
  • the exit windows 2, 3 may comprise a luminescent material.
  • the luminescent material may be phosphor that converts light from blue LEDs 6 into white light, when the light passes the exit windows 2, 3.
  • the LEDs 6 emit light toward the two exit windows 2, 3 where the light is scattered partially outward and partially inward back into the mixing chamber 1. More than half of the light that is reflected by one exit window 2, 3 is directly aimed toward the other exit window 2, 3, and vice versa, whereby a great part of the light emitted from the LEDs is also emitted by the lighting device 10, immediately or after only a few reflections within the mixing chamber 1.
  • the locations of the LEDs 6 affect the efficacy of the lighting device 10, for example in that light reflected by the exit windows 2, 3 that hits a LED 6 will be absorbed. Although parts of the light will be absorbed by the LEDs 6 or the reflective walls 4, 5, 7, 8, a main part of the light will be aimed toward one of the exit windows 2, 3.
  • each exit window 2, 3 is illustrated by arrows, to illustrate that there are two peaks in two different directions.
  • the highest intensities are found perpendicular to the exit windows 2, 3, since the exit windows 2, 3 are planar.
  • light emitted at an exit window 2, 3 has its highest intensity perpendicular to the respective exit window 2, 3, whereby the two peak intensities from the two exit windows 2, 3 may be directed to uniformly illuminate the street 12 on two sides of the pole 11.
  • an opening angle of the tapered end of the mixing chamber of between 0° to 60° provides a uniform, essentially rectangular light distribution.
  • the opening angle may for example be about 20° (in the illustrated example it is 22 °) to achieve an optimal uniform light distribution below the lighting device 10, such that the, here schematically illustrated, two light distribution areas 42, 43 from the two exit windows 2, 3 overlap.
  • the lighting device 10 of the present invention may hence illuminate a wider area along a street 12, by having peak intensities in two directions, whereby fewer lamps are needed.
  • Fig. 3-8 illustrates other examples of lighting devices according to the present invention.
  • Fig. 3 is a cross-section of a lighting device 20.
  • the intermediate reflective wall portion 5 that connects the tapered end of the triangular cross-section is wider, and parallel to the reflective wall 4.
  • the intermediate reflective wall portion 5 of the lighting device 30 protrudes into the mixing chamber 1.
  • the intermediate reflective wall portion 5 has a triangular cross-section, whereby light that is reflected by one side 5a of the triangle is aimed at one of the exit windows 2, and light that is reflected by the other side 5b of the triangle is aimed at the other exit window 3.
  • Such an arrangement further increases the efficiency of the lighting device 30, since more light will be directed toward and hence redirected by the exit windows 2, 3. It has been found that an opening angle of the cross-section of the triangular reflective wall portion 5 between 0° and 45° increases the efficiency.
  • the exit windows 2, 3 of the lighting device 40 are curved in a convex shape.
  • Fig. 6 illustrates a lighting device 50 comprising four exit windows 2, 3, 15, 16.
  • Each of the four exit windows, as well as the intermediate reflective wall 5 are arranged in planes, so that a larger part of the projection of the LED 6 on each of these planes individually, lies outside the exit windows and the intermediate reflective wall 5,
  • Fig. 7 is a perspective view illustrating a lighting device 60, comprising four exit windows 2, 3, 22, 23.
  • Two oppositely arranged exit windows 2, 3 or 22, 23 extend from the reflective wall 4 at an angle toward each other, so as to form a tapered end of the mixing chamber. That is, the four tapered exit windows form a translucent pyramid, which in the illustrated example is truncated at the tapered end by an intermediate reflective wall portion 5.
  • the reflective end walls or other reflective sides may be displaced by transparent exit windows, to emit light in more directions.
  • the lighting device may be less elongated, to form a lighting device with a more compact design, etc.
  • the exit windows may be facetted.

Abstract

L'invention porte sur un dispositif d'éclairage (10 ; 20 ; 30 ; 40), qui comprend une chambre de mélange (1) ; et au moins une source de lumière à semi-conducteurs (6) disposée dans ladite chambre de mélange (1). La chambre de mélange (1) est renfermée par au moins deux fenêtres de sortie de diffusion (2, 3), et au moins une paroi réfléchissante (4) ; et la source de lumière à semi-conducteurs (6) et les fenêtres de sortie de diffusion (2, 3) sont disposées les unes par rapport aux autres de telle sorte que moins de la moitié de la lumière qui est réfléchie par l'une des fenêtres de sortie de diffusion (2, 3) est dirigée vers la ou les parois réfléchissantes (4).
PCT/IB2010/054577 2009-10-15 2010-10-11 Dispositif d'éclairage comprenant une chambre de mélange WO2011045720A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09173121.6 2009-10-15
EP20090173121 EP2312203A1 (fr) 2009-10-15 2009-10-15 Dispositif d'éclairage avec chambre de mélange

Publications (1)

Publication Number Publication Date
WO2011045720A1 true WO2011045720A1 (fr) 2011-04-21

Family

ID=41828933

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/054577 WO2011045720A1 (fr) 2009-10-15 2010-10-11 Dispositif d'éclairage comprenant une chambre de mélange

Country Status (3)

Country Link
EP (1) EP2312203A1 (fr)
TW (1) TW201124658A (fr)
WO (1) WO2011045720A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643702A1 (fr) * 1989-02-24 1990-08-31 Roux Philippe Lampadaire d'eclairage exterieur demontable
US20060092638A1 (en) * 2004-10-28 2006-05-04 Harwood Ronald P Housing for intelligent lights
EP1852649A1 (fr) * 2006-04-21 2007-11-07 Jürgen Müller Lampe de mât solaire
US20080310158A1 (en) * 2007-06-18 2008-12-18 Xicato, Inc. Solid State Illumination Device
DE202009003105U1 (de) * 2009-03-09 2009-05-07 Semperlux Aktiengesellschaft - Lichttechnische Werke - Elektrisch betriebenes Austausch-Leuchtmittel zum Ersatz von Glasglühkörpern
WO2009093163A2 (fr) 2008-01-22 2009-07-30 Koninklijke Philips Electronics N.V. Dispositif d'éclairage à del et support transmissif comprenant une matière luminescente

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2643702A1 (fr) * 1989-02-24 1990-08-31 Roux Philippe Lampadaire d'eclairage exterieur demontable
US20060092638A1 (en) * 2004-10-28 2006-05-04 Harwood Ronald P Housing for intelligent lights
EP1852649A1 (fr) * 2006-04-21 2007-11-07 Jürgen Müller Lampe de mât solaire
US20080310158A1 (en) * 2007-06-18 2008-12-18 Xicato, Inc. Solid State Illumination Device
WO2009093163A2 (fr) 2008-01-22 2009-07-30 Koninklijke Philips Electronics N.V. Dispositif d'éclairage à del et support transmissif comprenant une matière luminescente
DE202009003105U1 (de) * 2009-03-09 2009-05-07 Semperlux Aktiengesellschaft - Lichttechnische Werke - Elektrisch betriebenes Austausch-Leuchtmittel zum Ersatz von Glasglühkörpern

Also Published As

Publication number Publication date
EP2312203A1 (fr) 2011-04-20
TW201124658A (en) 2011-07-16

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