WO2008152576A1 - Dispositif d'éclairage - Google Patents

Dispositif d'éclairage Download PDF

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Publication number
WO2008152576A1
WO2008152576A1 PCT/IB2008/052281 IB2008052281W WO2008152576A1 WO 2008152576 A1 WO2008152576 A1 WO 2008152576A1 IB 2008052281 W IB2008052281 W IB 2008052281W WO 2008152576 A1 WO2008152576 A1 WO 2008152576A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
sub
lens plate
optical
lighting device
Prior art date
Application number
PCT/IB2008/052281
Other languages
English (en)
Inventor
Elvira J. M. Paulussen
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 WO2008152576A1 publication Critical patent/WO2008152576A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0961—Lens arrays
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • 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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape

Definitions

  • the present invention relates to a lighting device and a product having such lighting device, said lighting device comprising a plurality of optical devices arranged in a planar distribution and a first lens plate.
  • the present invention also relates to a method for providing such lighting device.
  • LEDs Light-emitting diodes
  • a LED is formed by a semiconductor die, with a P-type semiconductor layer and an N-type semiconductor layer positioned on top of each other.
  • a PN junction is defined between the P- type semiconductor layer and the N-type semiconductor layer.
  • LEDs typically emit a single wavelength of light, depending on the band-gap energy of the materials forming the PN junction.
  • a variety of colors can be generated on the basis of the material used for making the LED.
  • LEDs made with gallium arsenide produce infrared and red light.
  • Other examples are gallium aluminum phosphide (GaAlP) for green light, gallium phosphide (GaP) for red, yellow and green light and zinc selenide (ZnSe) for blue light.
  • LEDs typically produce non-collimated radiation beams. Therefore, efforts have been made to collimate the light generated by a LED. Especially in the field of high- power LEDs, mixing of colors as well as beam-shaping and collimation optics are topics of frequent discussion. This is an effect of LEDs becoming more and more important in lighting applications.
  • Mixing techniques using red, green and blue LEDs for obtaining white light include for example mixing rods, light guides or reflectors, or a combination of these.
  • a disadvantage of these solutions is that they can be large and bulky in order to obtain good color mixing and good beam shaping. Modular high flux spot light sources making use of these techniques are almost impossible for compact lighting devices, scaling their sizes to huge dimensions.
  • a lighting device such as a modular spot light source, which has a high degree of compactness and color homogeneity.
  • a lighting device comprising a plurality of optical devices arranged in a planar distribution and a first lens plate, wherein each optical device comprises at least one radiation source and an optical element being arranged to create a substantially collimated radiation beam from radiation generated by the at least one radiation source.
  • the first lens plate extends along the plurality of optical devices and comprises a plurality of first sub-lenses, in which each first sub-lens projects a part of the radiation beam at an illumination window, such that the projections of each first sub-lens at least partially overlap.
  • the lighting device is advantageous in that it provides a compact light source having a high amount of light flux.
  • the lighting device may further comprise a second lens plate extending along the plurality of optical devices and having a plurality of second sub-lenses, wherein the second sub-lens of the second lens plate images a corresponding first sub-lens of the first lens plate at the illumination window, such that the images of each first sub-lens of the first lens plate projected by the second sub-lens of the second lens plate at least partially overlap.
  • the shape of the illumination window can be controlled by choosing the aperture shape of the first sub-lenses of the first lens plate.
  • the plurality of optical devices may be stacked in a two dimensional array, which is suitable for lighting applications and provides a high level of modularity.
  • Each radiation source may be a light emitting diode, which is advantageous in that cheap and efficient components are used.
  • the optical element of each optical device may comprise a transparent body including a first surface, a second surface and a cavity formed within at least the second surface, the cavity having a third surface, the second surface comprising a reflective region extending radially away from the cavity, and the first surface comprising an annular zone configured to provide internal reflection folding and an optical refractive transition between the transparent body and the exterior of the transparent body.
  • each optical device may also comprise a compound parabolic concentrator, or it may comprise an outer reflective portion and an inner refractive portion. Any of these embodiments is advantageous in that common components known per se are used.
  • Each optical device may comprise a plurality of colored light emitting diodes, which is advantageous in that the lighting device may emit any color.
  • Each optical device may comprise only one radiation source, whereby a simple arrangement is provided.
  • the above objective is provided according to a second aspect of the invention by a method for providing a lighting device.
  • the method comprises the steps of arranging a plurality of optical devices in a planar distribution, creating a substantially collimated radiation beam from radiation generated by at least one radiation sources of each optical device, arranging a first lens plate extending along the plurality of optical devices and comprising a plurality of first sub-lenses, and projecting, by means of each first sub-lens, a part of the radiation beam at an illumination window, such that the projections of each first sub-lens at least partially overlap.
  • the advantages of the first aspect of the invention are also applicable for this second aspect of the invention.
  • the method may further comprise the steps of arranging a second lens plate extending along the plurality of optical devices and comprising a plurality of second sub- lenses, and imaging, by means of each second sub-lens, a corresponding first sub-lens at an illumination window, such that the images of each first sub-lens of the first lens plate projected by the second sub-lens of the second lens plate at least partially overlap.
  • the method may further comprise the step of stacking the plurality of optical devices in a two dimensional array.
  • a product comprising a holder and a lighting device according to the first aspect of the invention.
  • the advantages of the first aspect of the invention are also applicable for this third aspect of the invention.
  • Other objectives, features and advantages of the present invention will appear from the following detailed disclosure, from the attached dependent claims as well as from the drawings.
  • Fig. 1 shows schematically a first optical element according to prior art.
  • Fig. 2 shows schematically a second optical element according to prior art.
  • Fig. 3 shows schematically a third optical element according to prior art.
  • Fig. 4 shows schematically a fourth optical element according to prior art.
  • Fig. 5 is a side view of an optical device.
  • Fig. 6 is a side view of an optical device and a first lens plate and a second lens plate.
  • Fig. 7 is a side view of an optical device and a first lens plate.
  • Fig. 8 is a side view of a lighting device according to one embodiment of the present invention.
  • Fig. 9 is a side view of a lighting device according to a second embodiment of the present invention.
  • Fig. 10 is a perspective view of a lighting device according to another embodiment of the present invention.
  • a lighting device 100 comprises a plurality of optical devices 10 and a first lens plate 30.
  • Each optical device 10 has at least one light source 11 and an optical element
  • Figs. 1 - 4 different optical elements are shown.
  • Fig. 1 shows an optical device 10 of a type disclosed in US 2004/0246606 Al.
  • Fig. 1 is a cross-sectional side view of such an optical element 12, which is rotationally symmetric.
  • the optical element 12 is formed by an entrance surface 13 and an exit surface 14.
  • a light emitting diode (LED) LED
  • the LED 11 is positioned in a cavity 15 formed in the entrance surface 13.
  • the LED 11 comprises a P- layer and an N-layer, as described above, and is positioned in a dome-shaped cover 16.
  • Fig. 1 also shows electric cables 17, which are connected to the LED 11 for its electric energy supply.
  • Exit surface 14 may be partly a mirror, for instance, in the centre near LED 11.
  • Entrance surface 13 is preferably a mirror.
  • the shape of the entrance surface 13 and the exit surface 14 is chosen to be such that the radiation beam exits the optical element 11 in a substantially collimated form.
  • Fig. 2 schematically depicts an alternative embodiment, showing an alternative optical element 12' according to the prior art.
  • the LED 11 is positioned completely inside this alternative optical element 12'. Again, the radiation generated by the LED 11 is reflected twice inside the optical element 12', first by exit surface 14', and subsequently by a rear surface 13', before the radiation exits the optical element 12' via exit surface 14'.
  • the optical element 12' is also rotationally symmetric.
  • a third embodiment of an optical element 12" is depicted.
  • the optical element 12" is a compound parabolic concentrator having an entry surface 13" and an exit surface 14".
  • a LED (not shown) is optically coupled to the light entry surface 13" and light propagates under reflection through the optical element 12".
  • the optical element 12" can either be hollow or solid. In case of a hollow optical element 12", the reflection occurs due to a coated surface of the optical element 12". In case of a solid optical element 12", the reflection occurs due to a coated surface of the optical element 12" and/or due to TIR.
  • Fig. 4 depicts a fourth embodiment of an optical element 12"' for collimating light emitted from a light source (not shown).
  • the collimator 12"' has an entry surface 13"' and an exit surface 14"'.
  • the collimator 12'" has an outer reflective portion 18 and an inner refractive portion 19.
  • the inner refractive portion 19 can be a lens or a lens pair.
  • a part of the light incident on the light entry surface 13"' is reflected based on TIR (total internal reflection) on the outside part of the collimator 18, and another part of the light is refracted by the inner lens(es) 19.
  • a collimated light beam is extracted from the light exit surface 14"'.
  • the optical device 10 has several light sources 11, 11' etc.
  • Each light source 11 may be a single LED or a plurality of LEDs, such that each light source 11, 11 ' is a group of LEDs.
  • the optical device 10 has two light sources 11 and 11 '.
  • the light source 11 emits red color, and 11 ' emits amber light.
  • the optical device 10 may have another number of light sources, e.g. four, wherein each light source emits light from any color.
  • any suitable number of LEDs having any combination of colors may be used, as will be evident to a skilled person.
  • the optical element 10 produces a substantially collimated radiation beam.
  • the term "collimated” is used herein to denote a radiation beam that is substantially parallel, for example 0-10°.
  • the radiation beam 20 is depicted in the Figure as a 'perfect' collimated radiation beam.
  • radiation beam 20 does not have a homogeneous color, but will be predominantly red at the top and predominantly amber at the lower side.
  • the radiation beam 20 as emitted by the optical device 10 is already mixed to a certain extent if the radiation source, i.e. the composition of the two LEDs 11, 11 ', is relatively small with respect to the optical element 10.
  • a device is provided for mixing the radiation emitted by the different LEDs 11, 11 '.
  • a first lens plate 30 and a second lens plate 40 are provided in accordance with an embodiment, as is schematically depicted in Fig. 6.
  • the first lens plate 30 comprises a plurality of sub-lenses 31 and the second lens plate 40 comprises a plurality of sub-lenses 41.
  • the sub-lenses 31, 41 of the lens plates 30, 40 are also referred to as lens lets. It will be understood that many alternative lens plates 30, 40 are conceivable, e.g. rectangular shaped and having rectangular shaped sub-lenses, or rectangular shaped and having circular shaped sub-lenses, or circular shaped and having hexagonal sub-lenses.
  • the aperture shape of the lens lets 31 can be different from the aperture shape of the lens lets 41.
  • the lens lets 31 can be rectangular and the lens lets 41 can be round, or vice versa.
  • a lens plate 30 is positioned behind the optical device 10, comprising a number of sub-lenses 31. Each sub-lens 31 has substantially the same focal distance, approximately f 1.
  • the second lens plate 40 is positioned substantially at a distance fl from the first lens plate 30, and sub-lenses 41 of the second lens plate 40 has substantially the same focal distance f2, which preferably is of the same magnitude as fl .
  • the second lens plate 40 images the lens lets 31 of the first lens plate 30 onto an illumination window 50.
  • This aspect is indicated by the broken lines in Fig. 5.
  • the illumination window 50 is relatively far remote from the second lens plate 40 and, for practical purposes, may thus be considered to be the far field.
  • the first lens plate 30 may be in the focal plane of the second lens plate 40, but may also be near the focal plane of the second lens plate 40.
  • the second lens plate 40 can have a plurality of second sub-lenses 41, arranged such that they image a corresponding first sub-lens 31 of the first lens plate 30 at the illumination window 50, such that the images of each first sub-lens 31 of the first lens plate 30 projected by the second sub-lens 41 of the second lens plate 40 at least partially overlap.
  • This illumination window 50 may be in the far field and may coincide with an object that is to be illuminated.
  • an object may have a surface that is to be illuminated by the light sources 11, 11 ', such as, for instance, a painting, a table, a window, a building, etc.
  • the techniques described here may also be used in projection display applications. For projection display applications, two lenses are preferably added in order to bring the illumination window to the near field. It is to be noted that illumination window 50 is relatively far remote from the second lens plate 40, which is only schematically depicted in the Figures.
  • far field is used herein to denote that the illumination window is relatively far remote from the second lens plate 40.
  • the lens plate 40 may have a diameter of only a few centimeters, in which case the term far field could refer to a distance of approximately 2 m.
  • Two sub-parts of the radiation beam 20 are depicted in Fig. 6: a red sub-part and an amber sub-part. The red sub-part is projected in the far field via a sub-lens 31 of the first lens plate 30 and a corresponding sub-lens 41 of the second lens plate 40.
  • the amber sub-part is projected in the far field via a further sub-lens 31 of the first lens plate 30 and a further corresponding sub-lens 41 of the second lens plate 40.
  • Fig. 6 shows that the red sub-part and the amber sub-part are mixed to a large extent in the illumination window 50.
  • the radiation emitted by all of the light sources 11, 11 ' is substantially mixed in the illumination window 50. If the light sources 11, 11 ' emit different colors, these colors are mixed in the illumination window, creating, for instance, white light. It will be understood that the number of sub-lenses 41 of the second lens plate
  • the focal distance f2 of the sub-lenses 41 of the second lens plate 40 may be substantially equal to the focal distance fl of the sub-lenses 31 of the first lens plate 30.
  • the first sub-lenses 31 of the first lens plate 30 may also be positioned at a distance from the corresponding sub-lenses 41 of the second lens plate, which distance is equal to the focal distance of the second sub-lenses 41 of the second lens plate 40.
  • the illumination window is in the far field, although the figures show it relatively close to the second lens plate 40.
  • the focal distances of the sub-lenses 31, 41 and the mutual distance between the first lens plate 30 and the second lens plate 40 do not necessarily need to be exactly equal to each other. Variations are allowed, for instance, variations that are equal to the thickness of the lens plates 30, 40.
  • the focal distances of the sub-lenses 31, 41 and the distance between the first lens plate 30 and the second lens plate 40 may be adjusted on the basis of the characteristics of the radiation beam 20 or on the basis of the desired size of the illumination window 50 at a certain distance.
  • each sub- projection and thus the illumination window 50, is determined by the shape of the sub-lens 31 of the first lens plate 30.
  • the second lens plate 40 is omitted, as is shown in Fig. 7. As will be evident to a skilled person, the second lens plate 40 no longer has an imaging function (broken lines in Fig. 6). Mixing of the radiation from different radiation sources (light sources 11, 11 ') and beam-shaping in accordance with the set-up of Fig. 6 therefore has a higher quality as compared with beam- shaping, i.e. collimation, of the set-up as shown in Fig. 7.
  • FIG. 8 shows a cross-sectional view of a plurality of optical devices 10 stacked in an array.
  • Each optical device has several light sources 11, 11 ', and each light source is at least one LED.
  • the optical device 10 has only one colored LED.
  • the optical device 10 has multiple colored LEDs.
  • the optical elements 12 are of the kind depicted in Fig. 2.
  • the optical elements can be of any type described herein, e.g. as shown in Fig. 1, Fig. 3 or Fig. 4, or any collimating components known per se.
  • the lighting device 100 comprises a first lens plate 30 extending over the array of optical devices 10.
  • Fig. 8 also shows a second lens plate 40, extending over the array of optical devices 10.
  • the optical elements of the lighting device 90 are compound parabolic concentrators 92.
  • the lateral compactness of the lighting device is thereby improved.
  • each compound parabolic concentrator 92 is approximately 1 cm in diameter.
  • a collimator as shown in Fig. 1 may be up to 5 cm.
  • a lighting device as shown in Fig. 9 has 25 times more optical elements than the lighting device as shown in Fig. 8.
  • the first lens plate and the second lens plate are incorporated in one single component 94. Light losses are thereby reduced, and the lighting device 90 can be even more compact.
  • Fig. 10 shows a perspective view of a lighting device 100 according to one embodiment of the present invention.
  • the optical devices 10 are arranged in a planar distribution in the shape of a two-dimensional array.
  • the first lens plate 30, comprising a number of lens lets (not shown) is arranged behind the optical devices 10.
  • the second lens plate 40 is arranged behind the first lens plate 30.
  • the first lens plate 30 may have a size which is different from that of the second lens plate 40.
  • the second lens plate 40 can be relatively small in comparison with the first lens plate 30.
  • the optical device 10, the first lens plate 30 and the second lens plate 40 may accommodated in a holder 60, providing a small and compact product.
  • the sub-lenses 31 of the first lens plate 30 can be positioned in a semi-circular configuration or the like. Each sub-lens 31 of the first lens plate 30 may have a different orientation. Accordingly, the sub-lenses 41 of the second lens plate 40 are positioned in a semi-circular configuration, but in an opposite direction. Each sub-lens 41 of the second lens plate 40 may have a different orientation. Consequently, the first lens plate 30 may have a convex (rounded) shape as viewed in the direction of propagation of the radiation beam 20, whereas the second lens plate 40 may have a concave (hollow) shape as viewed in the direction of propagation of the radiation beam 20.
  • first sub-lens 31 of the first lens plate 30 and a second sub-lens 41 of the second lens plate 40 may have a similar tilt with respect to their orientation as shown in Fig. 6, but in opposite directions.
  • the orientation of each second sub-lens 41 of the second lens plate 40 may be chosen to be dependent on the orientation of the first sub-lens 31 of the first lens plate 30, or vice versa.
  • all sub-lenses 31 of the first lens plate 30 are positioned in a straight line with tilted orientations, and the sub-lenses 41 of the second lens plate 40 are also positioned in a straight line with tilted orientations.
  • Each first sub-lens 31 of the first lens plate 30 may have an opposite tilt with respect to the tilt of the second sub-lens 41 of the second lens plate 40.
  • the optical devices 10 may be arranged in a concave structure, and the first lens plate 30 and the second lens plate 40 is correspondingly arranged in a concave arrangement.
  • the focal distances of the first and second sub-lenses 31, 41 of the first and second lens plates 30, 40 may vary as the distances between the corresponding sub-lenses 31, 41 from the first and second lens plates 30, 40 also vary.
  • the invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims.

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

Abstract

La présente invention concerne un dispositif d'éclairage comprenant une pluralité de dispositifs optiques (10) disposés dans une distribution planaire et une première plaque de lentilles (30). Chaque dispositif optique (10) comprend au moins une source de rayonnement (11) et un élément optique (12) disposés pour créer un faisceau de rayonnement collimaté de manière substantielle (20) à partir du rayonnement généré par la ou les sources de rayonnement (11), et la première plaque de lentilles (30) s'étend le long de la pluralité de dispositifs optiques (10) et comprend une pluralité de premières sous-lentilles, dans laquelle chaque première sous-lentille (31) projette une partie du faisceau de rayonnement (20) sur une fenêtre d'éclairage (50), de manière à ce que les projections de chaque première sous-lentille (31) se chevauchent au moins partiellement. Elle concerne aussi un procédé de mise à disposition d'un tel dispositif d'éclairage.
PCT/IB2008/052281 2007-06-14 2008-06-10 Dispositif d'éclairage WO2008152576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07110275 2007-06-14
EP07110275.0 2007-06-14

Publications (1)

Publication Number Publication Date
WO2008152576A1 true WO2008152576A1 (fr) 2008-12-18

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PCT/IB2008/052281 WO2008152576A1 (fr) 2007-06-14 2008-06-10 Dispositif d'éclairage

Country Status (2)

Country Link
TW (1) TW200914872A (fr)
WO (1) WO2008152576A1 (fr)

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WO2010091998A1 (fr) * 2009-02-11 2010-08-19 Osram Opto Semiconductors Gmbh Dispositif d'éclairage
WO2013003138A1 (fr) * 2011-06-27 2013-01-03 Cree, Inc. Système d'éclairage à del à vue directe et arrière
US9435515B2 (en) 2014-01-31 2016-09-06 Energizer Brands, Llc Near-field lens with convex hyperbolic surface
RU2660381C2 (ru) * 2013-06-27 2018-07-06 Филипс Лайтинг Холдинг Б.В. Осветительное устройство
EP3370104A1 (fr) * 2014-05-13 2018-09-05 CoeLux S.r.l. Système d'éclairage imitant la lumière du soleil
WO2019058137A1 (fr) * 2017-09-22 2019-03-28 Ceres Imaging Limited Éclairage d'hologrammes

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