WO2011117815A1 - Système d'éclairage ponctuel doté d'un mélange de lumière amélioré - Google Patents

Système d'éclairage ponctuel doté d'un mélange de lumière amélioré Download PDF

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Publication number
WO2011117815A1
WO2011117815A1 PCT/IB2011/051197 IB2011051197W WO2011117815A1 WO 2011117815 A1 WO2011117815 A1 WO 2011117815A1 IB 2011051197 W IB2011051197 W IB 2011051197W WO 2011117815 A1 WO2011117815 A1 WO 2011117815A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
illumination system
funnel shaped
light source
spot illumination
Prior art date
Application number
PCT/IB2011/051197
Other languages
English (en)
Inventor
Ralph Kurt
Teunis Willem Tukker
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 WO2011117815A1 publication Critical patent/WO2011117815A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0083—Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane
    • 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
    • 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 spot illumination system, where light from a plurality of light sources is collimated to achieve a high power spot illumination.
  • colored light sources eliminates the need for filtering, and thus increases efficiency and color consistency (replaced filter might introduce variation). Further, the emitted color can be changed by electronic control, and all accessible colors are always available without any hardware replacements. The market for these systems is quickly growing as LED performance improves.
  • Multi channel, high flux applications such as CDM replacement spots and multicolor entertainment spots (for theater/touring/stage/studio), require high light output.
  • a spot illumination system comprising a collimating element and a set of N light source arrays each comprising a plurality of light sources.
  • the collimating element is formed by a set of N funnel shaped reflectors each having a reflecting inner surface, an entrance aperture and an exit aperture, the exit aperture being greater than the entrance aperture, the funnel shaped reflectors being arranged in a bundle with all entrance apertures in one end and all exit apertures in an opposite end, and wherein the funnel shaped reflectors are truncated so that a side of a reflector facing an adjacent reflector terminates before the opposite end, such that the collimating element has N entrance apertures leading into N funnel shaped reflectors, which funnel shaped reflectors merge into one single exit aperture.
  • the N light source arrays are arranged to emit light into one of the entrance apertures, respectively.
  • the collimating element according to the invention thus receives light from N light sources and combines it into one light beam emitted from the single exit aperture.
  • the light from each light array is initially guided and mixed by a separate funnel shaped reflector, and then mixed with light from the other light arrays.
  • an improved mixing and collimation is achieved compared to arranging N funnel shaped reflectors next to each other, and emitting light from N exit apertures.
  • the collimating element according to the present invention further seamlessly combines N individual beams into one beam without visible borders between the individual beams.
  • the N light source arrays are preferably substantially identical. This provides an efficient manufacturing process, and enables optimal efficiency of the collimating element.
  • Each substantially identical light source array may be rotated around an optical axis in such a way as to avoid symmetry.
  • the truncated funnel shape reflectors are preferably arranged so closely together that the single exit aperture is smaller, most preferably 10%-20% smaller, than a combination of exit apertures of N non-truncated funnel shaped reflectors. Such a design further enhances collimation and light mixing.
  • a distance between adjacent light source arrays is preferably between 0.5 and 2 times an effective diameter of a light source array. According to one embodiment, the distance between adjacent light source arrays is approximately equal to the effective diameter of a light source array.
  • An effective diameter of the single exit aperture is preferably 1.5 - 6 times greater than an effective diameter of one light source array multiplied by N. This means that a beam width of the light emitted from each light source arrays is allowed to become 1.5 -6 times broader when passing the collimation element.
  • Each light-source array can comprise at least one set of light-sources configured to emit light of a first color and at least one set of light-sources configured to emit light of a second color different from the first color.
  • the spot illumination system may be controlled to emit a variety of colors.
  • the light mixing of the collimating element of the present invention will in this case include color mixing. Achieving color mixing inside the optics is efficient, compared to color mixing in the far field e.g. on a wall.
  • a collimating element according to the invention can achieve an optical efficiency of more than 70%, which is challenging to reach in a collimating and mixing optics with high brightness.
  • a set of light-sources may be a single light-source, or may be a group of light-sources arranged together.
  • a set of light-sources may be provided in the form of a line of light sources in a 2D array.
  • the number N can be any number greater than 1. However, in currently considered embodiments, the number N belongs to the set [2, 3, 4, 5, 7, 9, 12]. It has been shown that with such a number N, the funnel reflectors can be interlaced to provide satisfactory light mixing.
  • Figure 1 is a perspective view of an illumination system according to an embodiment of the present invention.
  • Figure 2 shows the collimating element in figure 1 in more detail.
  • Figure 3 is a plane view of the light emitting devices in the illumination system in figure 1.
  • Figure 4a-b are schematic plane views of collimating elements formed by three heptagonal interlaced tubular reflectors.
  • Figure 5 is a simulated beam profile of the collimating element in figure 4a.
  • Figure 6 is a schematic cross section of a collimating element formed by two heptagonal interlaced tubular reflectors.
  • Figure 7a-b are schematic cross sections of collimating elements formed by four heptagonal interlaced tubular reflectors.
  • Figure 8 is a schematic cross section of a collimating element formed by five octagonal interlaced tubular reflectors.
  • Figure 9 is a schematic cross section of a collimating element formed by seven octagonal interlaced tubular reflectors.
  • FIG. 1 shows a perspective exploded view of an illumination system for spot illumination suitable for atmosphere creating lighting, such as scene setting.
  • the illumination system 10 here comprises three light source arrays 1, such as LED arrays, mounted on a carrier, such as a printed circuit board (PCB) 3, which is arranged on a heat spreader 4, which is in turn arranged on a heat sink 5.
  • the illumination system 10 further comprises a collimating element 2 with a reflective inner surface.
  • the collimating element has three entrance apertures 7, each aligned with one of the light source arrays 1, and only one exit aperture 8.
  • a diffusing member here in the form of an optically diffusing sheet 9 is provided and or a field lens that further collimates the light beam.
  • the system 10 further comprises circuitry to power and control the light source arrays, but as this circuitry is not essential for the disclosure of the present invention, a description thereof has been omitted for sake of brevity.
  • a spacer ring 14 may serve as mechanical and optical interface between light source arrays and the collimating element.
  • the collimating element 2 which is shown in more detail in figure 2, has a shape corresponding to three funnel shaped, tubular reflectors 11, which have been interlaced with each other.
  • Each tubular reflector here has a polygonal cross section in a plane perpendicular to the optic axis of the illumination system, in the illustrated case with seven sides (a heptagonal cross section). Sides 12 that meet sides of adjacent reflectors have been truncated to terminate before the end of the collimating element. Thereby, the three reflectors merge into one exit aperture 8.
  • the entrance apertures 7a, 7b, 7c of the reflectors each form one of the entrance apertures of the collimating element 2.
  • the optical axis of the individual reflectors 11 can be slightly tilted towards the optical axis of the entire illumination system. This may further improve the combination of light beams from the individual light source arrays into one beam.
  • the reflective inner surfaces of the reflectors 1 la-c are straight.
  • the inner surfaces may also be convex as seen from the optical axis of each entrance aperture, i.e. forming a trumpet shaped reflector. It may also be possible to have concave inner surfaces.
  • the body of the collimating element can be fabricated from polymeric material by assembling multiple pieces together or as a single piece e.g. by injection molding or rapid prototyping.
  • a highly reflective foil such as Miro foil can then be attached (e.g. glued) onto the inner surface thereof.
  • the inner surface can be coated with a high reflecting mirror.
  • the reflective part of the envelope can be relatively thin with a thickness between 0.5mm and 10mm, preferably between 0.7mm and 5mm, most preferably between 0.8 and 2mm.
  • the reflective part can be in contact with the heat spreader 4 or heat sink 5, and preferably it is attached to the board 3 on which the light source arrays 1 are mounted.
  • a POC foil is arranged at or close to the exit aperture 8 of the collimating element.
  • the illumination system may generally comprise any number N of substantially identical light source arrays 1 and corresponding number of funnel shaped reflectors interlaced to form a collimating element 2 with one exit aperture 8.
  • N could be 2, 3, 4, 5, 7, 9 or 12, and some examples will be given in the following.
  • the polygonal cross section may have any number of sides, such as four, five, six, seven, eight or nine. Alternatively, the cross section is not polygonal at all, but may be circular or elliptical.
  • FIG. 3 illustrates the light source arrays 1 and their placement in more detail.
  • Each array 1 is here substantially identical and comprises a plurality of light emitting devices 13, such as LEDs.
  • the light source arrays 1 may comprise between 5 and 250 light sources, and typically between 70 and 150.
  • a high densely packed LED array may have a high EPI density, preferably between 5 and 70%, more preferably between 15 and 50%.
  • Each array may further comprise several, for example 2-8, sets of light sources that emit different colors, for example one set of red LEDs, one set of blue LEDs, and one set of green LEDs.
  • the light source arrays include LEDs with white (W), red (R), green (G), blue (B) or amber (A), cyan (C), deep red (dR) and/or deep blue (dB) emission spectrum. By combination thereof, any desired light spectrum is obtainable that falls within the color space made up by the color coordinates of the
  • WRGBAdRdB starting LEDs are also possible, such as neutral white and warm white (NW + WW), combinations with cold white (e.g. CW + WW), (RGBA), (RGB AW), (RGBW), (RGB AC), (RGBAdR), (RGBACdR) and (RGBACdRW).
  • the light source arrays may be rotated relative each other, so as to avoid symmetry.
  • the light source arrays 1 should be rotated by an angle different from 120 degrees.
  • each light source array may be in the order of 1-10 klm, and the combined lumen output of the illumination system may be 40klm or greater, by combining several light source arrays.
  • the distance L between adjacent light source arrays may be between 0.5 and 2 times the effective diameter D of an LED array, and in the give example this distance L is approximately 0.8 D.
  • Figure 4a and 4b illustrates how different collimating elements may be formed using identical funnel shaped reflectors, simply by interlacing them with different distances L.
  • the reflectors 11 have been placed closer together than in figure 4b.
  • figure 5 shows a simulation of the beam shaping function of the collimating element 2 in figure 2. It is clear that the collimating element can transform a Lambertian light distribution from light sources such as LEDs into the required beam shape of 10° - 40° FWHM.
  • the collimating element should further provide satisfactory color mixing, i.e. it is a collimating and mixing element 2.
  • a transparent protection layer on top of the light source arrays or at least parts of them.
  • the components (e.g. LEDs) and wire bonds to the circuitry are then protected against moisture,
  • a transmissive part may further be arranged directly on top of each light source array 1. It could be a single lens or curved surface, or be part comprising multiple lenses, microstructures or planar elements.
  • Such a transmissive part may comprise a transmissive ceramic material, a substantially transmissive glass or polymeric foil material.
  • the transmissive part may further comprise a transmissive silicon layer, which is direct contact with said LED array, for improved optical light out-coupling.
  • the transmissive part may also comprise optical structure(s) with lens shape on the surface such as a microlens array.
  • the illumination system 10 may advantageously comprise an optically diffusing member 9 arranged at the exit aperture 8 of the tubular reflector 2. Since the light is generally relatively homogeneous close to the optic axis, the light-diffusing member 9 has a lower diffusing capability there than further away from the optic axis. This may, for example be achieved by providing a film comprising scattering particles, where the concentration of scattering particles increases with increasing distance from the optic axis of the illumination system 10.
  • the optically diffusing member 9 may, alternatively, have a hole in the middle and thus not absorb or scatter any of the light output by the illumination system 10 close to the optic axis thereof.
  • the diffusing capability of the optically diffusing member 9 may be accomplished using other means, such as through a holographic pattern and/or a surface relief. It should be noted that the light-diffusing member 9 may
  • Figure 6 shows a cross section of a collimating element formed by interlacing only two tubular reflectors.
  • Figures 7a and 7b show two different examples of cross sections of collimating elements formed by interlacing four heptagonal tubular reflectors. In figure 6a, the distance between the tubular reflectors is smaller than in figure 6b.
  • Figure 8 shows an example of a cross section of a collimating element formed by interlacing five octagonal tubular reflectors.
  • Figure 9 shows an example of a cross section of a collimating element formed by interlacing collimating element with seven octagonal tubular reflectors.

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  • 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

La présente invention a trait à un système d'éclairage ponctuel (10) qui comprend un élément de collimation (2) constitué d'un jeu de N réflecteurs en forme d'entonnoir (11) et d'un jeu de N réseaux de sources lumineuses (1), comprenant chacun une pluralité de sources lumineuses (12). Les réflecteurs sont chacun dotés d'une surface intérieure réfléchissante, d'une ouverture d'entrée et d'une ouverture de sortie, et sont agencés en groupe, toutes les ouvertures d'entrée étant placées à une extrémité et toutes les ouvertures de sortie étant placées à l'extrémité opposée. Les réflecteurs en forme d'entonnoir sont en outre tronqués de sorte qu'un côté (12) d'un réflecteur faisant face à un réflecteur adjacent prenne fin avant l'extrémité opposée, de manière à ce que l'élément de collimation soit doté de N ouvertures d'entrée (7) menant jusqu'à N réflecteurs en forme d'entonnoir (11), lesquels réflecteurs en forme d'entonnoir fusionnent en une seule ouverture de sortie (8). Les N réseaux de sources lumineuses (1) sont agencés de manière à émettre de la lumière vers l'une des ouvertures d'entrée (7), respectivement. La lumière provenant de chaque réseau de lumière est initialement guidée et mélangée au moyen d'un réflecteur en forme d'entonnoir distinct, puis mélangée avec la lumière provenant des autres réseaux de lumière. En conséquence de quoi, il est possible d'obtenir un mélange et une collimation améliorés par rapport à une configuration suivant laquelle les N réflecteurs en forme d'entonnoir sont agencés les uns à proximité des autres et la lumière est émise à partir des N ouvertures de sortie.
PCT/IB2011/051197 2010-03-25 2011-03-22 Système d'éclairage ponctuel doté d'un mélange de lumière amélioré WO2011117815A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10157778.1 2010-03-25
EP10157778 2010-03-25

Publications (1)

Publication Number Publication Date
WO2011117815A1 true WO2011117815A1 (fr) 2011-09-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2985512A4 (fr) * 2013-04-11 2016-11-16 Appotronics China Corp Module d'unité de del, dispositif électroluminescent et système de source de lumière

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200002B1 (en) 1999-03-26 2001-03-13 Philips Electronics North America Corp. Luminaire having a reflector for mixing light from a multi-color array of leds
WO2006033032A1 (fr) * 2004-09-24 2006-03-30 Koninklijke Philips Electronics N.V. Systeme d'eclairage
GB2456123A (en) * 2007-02-12 2009-07-08 Ecoled Lighting Ltd Light emitting diode lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6200002B1 (en) 1999-03-26 2001-03-13 Philips Electronics North America Corp. Luminaire having a reflector for mixing light from a multi-color array of leds
WO2006033032A1 (fr) * 2004-09-24 2006-03-30 Koninklijke Philips Electronics N.V. Systeme d'eclairage
GB2456123A (en) * 2007-02-12 2009-07-08 Ecoled Lighting Ltd Light emitting diode lamp

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2985512A4 (fr) * 2013-04-11 2016-11-16 Appotronics China Corp Module d'unité de del, dispositif électroluminescent et système de source de lumière
KR101817310B1 (ko) 2013-04-11 2018-01-10 아포트로닉스 차이나 코포레이션 Ｌｅｄ 유닛 모듈, 발광 장치 및 관련 광원 시스템
KR20180005279A (ko) * 2013-04-11 2018-01-15 아포트로닉스 차이나 코포레이션 Ｌｅｄ 유닛 모듈, 발광 장치 및 관련 광원 시스템
US9970628B2 (en) 2013-04-11 2018-05-15 Appotronics China Corporation LED unit module, light-emitting device, and light source system
KR101884182B1 (ko) 2013-04-11 2018-08-02 아포트로닉스 차이나 코포레이션 Ｌｅｄ 유닛 모듈, 발광 장치 및 관련 광원 시스템
KR101914684B1 (ko) 2013-04-11 2018-11-05 아포트로닉스 차이나 코포레이션 Ｌｅｄ 유닛 모듈, 발광 장치 및 관련 광원 시스템

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