WO2009150580A1 - Dispositif électroluminescent - Google Patents
Dispositif électroluminescent Download PDFInfo
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- WO2009150580A1 WO2009150580A1 PCT/IB2009/052361 IB2009052361W WO2009150580A1 WO 2009150580 A1 WO2009150580 A1 WO 2009150580A1 IB 2009052361 W IB2009052361 W IB 2009052361W WO 2009150580 A1 WO2009150580 A1 WO 2009150580A1
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- WIPO (PCT)
- Prior art keywords
- light
- emitting device
- light emitting
- wavelengths
- light source
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Classifications
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- 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
- 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
- F21K9/68—Details of reflectors forming part of the light source
-
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/148—Beam splitting or combining systems operating by reflection only including stacked surfaces having at least one double-pass partially reflecting surface
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
-
- 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
-
- 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
- F21Y2113/00—Combination of light sources
- F21Y2113/10—Combination of light sources of different colours
- F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
-
- 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]
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- 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
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- 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
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
Definitions
- the present invention relates to the field of light emitting devices and, more particularly, of light emitting devices capable of producing a collimated and narrow beam of well-mixed colors.
- Said light emitting devices can be solid state lighting sources such as Light Emitting Diodes, hereinafter designated as LEDs.
- LEDs have permitted huge improvements in lighting technologies. In comparison with older technologies, such as incandescent or halogen bulbs, light emitting devices based on LEDs are significantly:
- One well-known embodiment of the LEDs technology in light emitting devices comprises at least two preferably three kinds of LEDs having different colors, typically red, blue and green.
- Such polychromatic LEDs assembly can be both used to produce white light, with higher luminous power and precise control of the color temperature, or it can be used to produce any other color, fixed or changing with a real-time control.
- some other LEDs with corresponding colors can be added in these assemblies in order to enlarge the colorimetric space of the resulting light.
- polychromatic LEDs devices can be employed in various applications, such as proximity lighting, grazing lighting, lighting with fiber devices, small light-up
- illumination spot lighting
- shop lighting and more generally accent lighting, i.e. decorative lighting, highlighting of elements of interior design such as pictures, plants, of buildings or of landscaping.
- a relevant assessment criterion of the quality of the color mixing is the stability and the homogeneity of the global color of the beam.
- the color mixing remains good on long distances from the light sources.
- the document EP-B-0734077 discloses a light emitting device having a stacked optical structures successively aligned along a light path, each optical structure comprising one LED and one dichroic parabolic mirror arranged for back- reflecting the color of the LED along the light path while transmitting the other colors to the next optical structure.
- Such a light emitting device emits parallel light rays with a good color mixing on long distances.
- Our invention improves the situation, by proposing a light emitting device capable of producing a beam of mixed wavelengths, comprising
- a reflector assembly comprising at least two reflective surfaces facing the light source assembly, each reflective surface being capable to selectively reflect back some of said wavelengths or ranges of wavelengths and to transmit the non reflected wavelengths, wherein the light source assembly is located at one side of the device and the reflector assembly at another side.
- the reflector assembly is arranged and positioned such that the wavelengths or ranges of wavelengths back-reflected by the corresponding reflective surfaces are mixed along a light path.
- the light emitting device proposes a solution which facilitates its use and maintenance by a user. For example, since the light sources are placed at one side, it can be easier to replace them or to connect them easily to a control unit.
- a single cooling system e.g. heat sink
- a second example of a new design two reflecting surfaces might be provided on each side of a single substrate (e.g. a lens). This device needs then one component for two mirrors instead of two components for two mirrors as it is known from prior art.
- This exemplary second new design might decrease the manufacturing costs and/or reduce the whole volume of the light emitting device, while keeping a very good mixing of the reflected light rays preferably collimated on a long distance, especially if the reflecting surfaces are arranged for back reflecting some parallel rays.
- the known light emitting devices comprise one component provided with solely one mirror on a surface (typically the front surface) and with either no coating or coated with an anti-reflective material on its opposite surface.
- the first case no coating
- the second case anti-reflective coating
- the beam produced by the light emitting device according to the invention is collimated.
- the light source assembly of the light emitting device comprises at least two LEDs (Light Emitting Devices); these LEDs are preferably located on a single cooling system;
- the light assembly comprises a number of light sources equal to the number of reflective surfaces; - two of said reflective surfaces are provided on each side of a single substrate, such as a lens; this substrate may be made of a dielectric material;
- the light source assembly comprises Lambertian light sources emitting towards the half-space of the reflector assembly;
- the light source assembly comprises a plurality of light sources aligned on a line perpendicular to the light path;
- the light source assembly comprises light sources aligned on a line not perpendicular to the light path;
- the starting points Pk of the light emitted from the light sources Lk are substantially cop lanar.
- the invention relates to an algorithm for calculating the equations of the shapes of the optical reflective surfaces S(k'), this algorithm consisting in:
- FIG. 1 is a schematic view of a light emitting device according to one embodiment of the invention.
- FIG. 2 is a detailed view of part II of Figure 1.
- FIG. 3 is a schematic view of the light emitting device of Figure 1, showing the initial step of the algorithm used to determine the equations of the three reflective surfaces.
- - Figure 4 is a schematic view of the light emitting device of Figure 1, showing the first step of the algorithm used to determine the equation of the first reflective surface.
- - Figure 5 is a schematic view of the light emitting device of Figure 1, showing the second step of the algorithm used to determine the equation of the second reflective surface.
- FIG. 6 is a schematic view of the light emitting device of Figure 1, showing the third step of the algorithm used to determine the equation of the third reflective surface.
- FIG. 7 is a schematic view of the light emitting device of Figure 1, showing the mixing of the rays emitted by the light emitting source along the light path.
- Figure 1 shows a light emitting device which emits narrow and sharp light beams with and a good color mixing over a long distance from the light source, which means no significant variation of chromaticity over the beam.
- Such light emitting device is used for instance in proximity, grazing or accent lighting.
- This light emitting device of Figure 1 comprises a light source assembly 1 at one side of the light emitting device and a reflector assembly 2 facing the light source assembly
- the light source assembly 1 emits lights beams which are then reflected back by the reflector assembly 2 such that the light emitting device outputs a light around an optical axis designated as XX.
- Said light source assembly 1 and said reflector assembly 2 are mounted in a housing 4, e.g. a parallelepipedal case, containing light transmissible material 5, air for instance.
- Said housing 4 comprises two opposite longitudinal walls 4L, 7S and two opposite lateral walls 4' & 4".
- Said housing 4 can be made of metal or of any suitable polymer, for example a thermoplastic polymer or a thermosetting plastic polymer such as polycarbonate or ABS.
- the light source assembly 1 includes three light sources Ll, L2 & L3, three LEDs in this preferred embodiment, set up on a single cooling system or heatsink 3 which is assembled on the inner side of the longitudinal wall 4L of the housing 4.
- Each LED Ll, L2 or L3 emits at least one (in this case one) wavelength ⁇ l, ⁇ 2 or ⁇ 3 (or ranges of wavelengths ⁇ l, ⁇ 2 or ⁇ 3).
- Ll may emit green light
- L2 may emit blue light
- L3 emit red light.
- LEDs Ll, L2 & L3 may emit light preferably towards the reflector assembly 2, e.g to the corresponding half-space, meaning they are Lambertian light sources.
- the separate light sources Ll, L2 & L3 of the light source assembly 1 are advantageously disposed side by side and as close as possible from each other, for offering a compact structure which avoids any blocking of the light coming from the reflective surfaces Sl, S2 and S3.
- each of the LEDs Ll, L2, & L3 exhibits e.g. a starting point Pl, P2 or P3 of the light (of the luminous rays), as shown in Figure 2.
- Said starting points Pl, P2 and P3 of the light are substantially coplanar and substantially as close as possible from each other, preferably on the same axis. This latter axis might be orthogonal to the optical axis XX.
- “Substantially” means for instance that the margin of error is comprised between +/- 10mm, preferably 5 mm.
- the light source assembly 1 is coaxial with the optical axis XX.
- the light source assembly 1 could have an optical axis different from XX and the reflective surfaces Sl, S2 and S3 are arranged for back- reflecting the light around a XX axis tilted to the optical axis of the light source assembly 1.
- the light source assembly 1 could have an optical axis different from XX and an additional optical means can be used to deviate the incident light from the light assembly 1 to the XX-axis of the reflector assembly 2.
- the light sources Lk (Ll, L2, L3), preferably coplanar, can be either in a linear or triangular arrangement. If k were equal to 4, the square arrangement might be chosen, in order to satisfy to the compactness requirement.
- the reflector assembly 2 comprises three reflective surfaces, Si, S 2 and S3 facing and opposite to the LEDs Ll, L2, & L3 in the housing 4.
- the reflective surfaces Si and S 2 are the two dioptres, respectively inner and outer, of a lens 6 which is placed or fixed in the housing 4 by its peripheral edge mounted on the lateral walls (4', 4") and/or on the transversal walls (not shown on the drawings) of the housing 4.
- This lens 6 is for instance made of a mineral glass (for example crown borosilicate glass -BK7-, SFl 1, etc.), or of an organic glass (e.g. polycarbonate, polyamide, PMMA, PE, Plexiglas etc.), or of any other dielectric material (for instance saphire, ZnO, ITO, Quartz, CaF 2 , MgF 2 , etc).
- Sl and/or S2 can be obtained by coating the lens 6 with an appropriate multilayer filter having alternated layers of low refractive indicia and high refractive indicia, made for example of alternating layers of TiO2 and SiO2.
- the lens 6 is generally perpendicular to the optical axis XX and this latter corresponds roughly to the central geometrical axis of the lens 6.
- the reflective surface S3 is defined by the inner face of the longitudinal wall 7S of the housing 4.
- the optical axis S3 is XX.
- S3 can be obtained by means of an appropriate surface treatment, such as pure Aluminium.
- Sl is a parabolic of revolution focus is Pl such that it reflects back parallel rays around XX-axis.
- each reflective surface Sl, S2 & S3 is arranged and positioned such that the wavelengths or ranges of wavelengths back-reflected by the corresponding reflective surfaces are mixed along a light path. Furthermore, each reflective surface Sl, S2 or S3 is designed so as to selectively reflects the different colors emitted by Ll, L2 or L3, depending on their wavelengths.
- the selective properties of reflexion of Sl, S2 & S3 can be obtain by adapting shapes of the surfaces and/or covering said surface with a pass-band film having a maximum transmission around the wavelength or range of wavelengths emitted by the light source.
- a pass-band film having a maximum transmission around the wavelength or range of wavelengths emitted by the light source.
- Sl reflects the wavelength or the range of wavelengths emitted by Ll (e.g. color blue) - see figure 4 - and transmits the wavelength or the ranges of wavelengths emitted by L2 and L3 (e.g. colors: red for L2 - see figure 5 - and green for L3 - see figure 6) emitted by L2 & L3; 2.
- S2 reflects the wavelength or the range of wavelengths emitted by L2 (e.g. color red) - see figure 5 - and transmits the wavelengths or the ranges of wavelengths emitted by L3 (e.g. color green for L3 - see figure 6);
- S3 reflects the wavelengths or the ranges of wavelengths emitted by L3.
- the wavelengths transmitted by Sl and S2 are refracted respectively by the lens 6 and by the air between S2 and S3, and vice versa in the route back of the reflected rays.
- Figure 7 shows the path of all the rays emitted together by Ll, L2 and L3. It shows also how the mixing of the wavelengths of the back-reflected beam, i.e. how the rays from the light source assembly 1 are distributed over the whole reflecting surfaces Sl, S2, S3 and how the rays forming the resultant back-reflected beam are preferably parallel to each other, and thus well mixed and collimated.
- the shapes of the three reflective surfaces Sl, S2 and S3 are calculated by the means of an algorithm, which is described as follows, so as to output rays around a single axis XX, and preferably with parallel rays.
- the calculation can be made with a well-known optical calculation software, such as Speos® or Soltis Odyssey® commercialized by Optis, Zemax® commercialized by Zemax Development Corporation or Code V® or LightTools® commercialized by Optical Research Associates.
- the modelling system preferably used in the invention is represented in figure 3. It comprises the light sources Li, L 2 and L3, the reflective surfaces Si, S 2 and S3, a converging (paraxial) lens 8 and a screen 9 placed outside the light emitting device, beyond the outlet of the light emitting device.
- the lens 8 has a primary focal point, Fl, and a secondary focal point, F2, Fl being located at the light emitting device side.
- the screen 9 coincides with the secondary focal point F2.
- a three-dimensional orthogonal system (X,Y,Z) is defined with X collinear to XX.
- the three optical surfaces Si, S 2 and S3 are considered as diopters.
- the diopters can be for example air/glass or air/polycarbonate.
- the model used for the algorithm considers that the light emitted by the light sources is composed of multiple rays, with defined wavelength or range of wavelengths.
- Light source assembly 3 starting points Pl, P2, P3 of the light Ll (blue), L2 (red) and L3 (green).
- the distance between Pl and the apex of the parabolic Sl is 10 mm.
- the lens 6 is designed, according to a 1 st approximation, from a sphere having a diameter of 32 mm.
- Sl, S2 and S3 are ideal dioptres and mirrors, i.e.: no reflection/transmission loss per color.
- the distances between the centers of Sl & S2, and of S2 & S3 2 mm. • The substance between Sl and S2 (i.e. lens 6) is BK7 and the substance 5 between S2 and S3 and between the light source assembly 1 and Sl is air.
- Each source Ll L2 L3 emits a conical beam of 120° from its respective starting point Pl P2 P3.
- the focal point without convergent lens 8 of the three parallel and collimated in the three configurations is the infinity.
- the approach is for example to output parallel back-reflected rays per color (using paraxial) and to get the three colors on top of each other by coincidence of spots in focal point F2 of lens 8 (Steps 1-3: see figures 4-6).
- the degree of collimation of the rays is assessed through the coincidence of the spots issued from Ll L2
- a gaussian quadrature-algorithm which uses three rings and six arms is e.g. implemented. It determines the following number of rays traced in this model:
- the first step of the algorithm is represented in figure 4 (Config 1). It determines the equation of the first reflective surface S 1.
- the initial equation of the first reflective surface Sl is a polynomial: n n
- the accuracy of the calculation increases with the order of the polynomial.
- the first step only the rays emitted by the first light source Li are considered.
- these rays After being emitted, these rays are reflected backward by the first reflective surface S 1 . After leaving the light emitting device, the rays passes through the lens which focuses the rays onto the screen.
- the first step considers several luminous rays emitted by the first light source L 1 , typically 3.
- the coefficients ⁇ A ⁇ can be optimized in order to obtain the global minimum of the merit function.
- the second step of the calculation algorithm is represented in figure 5 (config 2). It determines the equation of the second reflective surface S2.
- the initial equation of the second reflective surface is a polynomial: n n
- the second step only the rays emitted by the second light source L 2 are considered. After being emitted, these rays are refracted by the first reflective surface S 1 , reflected backward by the second reflective surface S 2 and refracted again by the first reflective surface S 1 . After leaving the light emitting device, the rays passes through the lens 8 which focuses the rays onto the screen 9.
- the second step considers several luminous rays emitted by the second emitting source E 2 , typically 18.
- ⁇ 0 n can be optimized in order to obtain the global minimum of the merit function.
- the third step of the calculation algorithm is represented figure 6. It determines the equation of the third reflecting surface.
- the equations of the first and the second reflective surface are the one determined in the first and second step.
- the initial equation of the third reflecting surface is a polynomial: n n
- the accuracy of the calculation increases with the order of the polynomial.
- the third step only the rays emitted by the third emitting source E 2 are considered. After being emitted, these rays are refracted by the first reflective surface S 1 , refracted by the second reflective surface S 2 , reflected backward by the third reflective surface S3, refracted by the second reflective surface S 2 and finally refracted by the first reflective surface S 1 . After leaving the light emitting device, the rays passes through the lens which focuses the rays onto the screen.
- the third step considers several luminous rays emitted by the second emitting source E 2 , typically 18.
- the coefficients can be optimized in order to obtain the global minimum of the merit function.
- the fourth step of assessment of the degree of collimation of the rays is the fourth step of assessment of the degree of collimation of the rays.
- the intersection of the focused rays and the screen would be a single point.
- a merit function is calculated in order to evaluate the degree of collimation of the rays.
- the merit function can take into consideration the diameter "d" of the spot from Ll L2 or L3 which has the smallest diameter and which enclose every point obtained by the intersection of the luminous rays and the screen 9.
- a mould or a set of moulds might be realized.
- CAD Computer- Aided Design
- the process for calculating the surfaces may include the following operations:
- the solid geometry is converted into mould geometry, depending on the material used, the manufacturing process and the solid geometry.
- the output mould geometry is then entered into a CAM (Computer-Aided Manufacturing) independent software or module.
- CAM Computer-Aided Manufacturing
- Catia® can be used with such a CAM module.
- the CAM software converts the mould geometry into a CNC (Computer Numerical Control) program, this program being able to command the CNC.
- the mould can be machined from raw metal with the above mentioned program.
- the manufacturing process of the surfaces differ according to the material used.
- a thermoplastic material such as Polycarbonate
- this filter can be made from a multilayer structure consisting in a succession of high refractive and low refractive layers (e.g. successive TiO2/SiO2 layers) adapted to filtering out most of the wavelengths outside the wavelength or the range of wavelengths emitted by the light source associate respectively to these surfaces.
- This kind of multilayer structure can be made from any know technique, such as for example one technique of Chemical Vapor Deposition (CVD).
- machining eventually high speed machining, of a preform made of dielectric material, preferably plastic or glass, and possibly resurfacing, depending on required precision
- spin casting of a dielectric material, preferably plastic or glass, and possibly resurfacing, depending on required precision.
- This invention can be applied in the realization of spots (Spot RGB indoor and LEDBeamer RGB projects at BU Luminaires) using multi-dye LED packages (OsiP and Maverick projects at BU SSL) or individual LEDs on a printed circuit board. These spots are used in outdoor and retail/shop lighting segments. It is to be understood that the invention is not limited to a light emitting device having a LED assembly 1 of three monochromatic LEDs but can also have two LEDs or more LEDs emitting different colors or the same colors.
- the corresponding reflecting surfaces might be calculated accordingly by a person skilled in the art, by using for example known modelling techniques, such as those aforementioned.
- the calculation of the reflective surfaces Sl, S2, S3 may also be performed so as to output non parallel rays around XX-axis, and thus the light emitting device outputting a conical beam.
- the number of reflecting surfaces might be different from the number of light sources, one reflective surface can be calculated for back-reflecting the light emitted by two or more LEDs so as to have a final acceptable color mixing.
- Ll L2 and L3 can represent respective parallel lines of LEDs which extend perpendicularly to XX-axis, and the reflective surfaces Sl, S2, S3 are calculated not for being of revolution but for being extended along respective lines parallel to Ll, L2, L3 lines: the reflected light is thus spread on longer surface.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
L'invention porte sur un dispositif électroluminescent qui comprend un ensemble source de lumière (1) émettant au moins deux longueurs d'onde ou plages de longueurs d'onde distinctes, et un ensemble réflecteur (2) comprenant au moins deux surfaces réfléchissantes (S1, S2, S3) en regard de l'ensemble source de lumière (1). Chaque surface réfléchissante est capable de réfléchir sélectivement certaines desdites longueurs d'onde ou plages de longueurs d'onde et de transmettre les longueurs d'onde non réfléchies. L'ensemble source de lumière (1) est placé d'un côté du dispositif électroluminescent et l'ensemble réflecteur (2) de l'autre côté.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP08305263.9 | 2008-06-13 | ||
EP08305263 | 2008-06-13 |
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WO2009150580A1 true WO2009150580A1 (fr) | 2009-12-17 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/IB2009/052361 WO2009150580A1 (fr) | 2008-06-13 | 2009-06-04 | Dispositif électroluminescent |
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WO2014045137A1 (fr) * | 2012-09-21 | 2014-03-27 | Koninklijke Philips N.V. | Ensemble électroluminescent, lampe et dispositif d'éclairage |
US9151463B2 (en) | 2010-12-29 | 2015-10-06 | 3M Innovative Properties Company | LED color combiner |
CN114721161A (zh) * | 2021-01-05 | 2022-07-08 | 台达电子工业股份有限公司 | 激光光斑消除装置及其操作方法 |
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WO2005050262A2 (fr) * | 2003-11-14 | 2005-06-02 | Light Prescriptions Innovators, Llc | Combineur de faisceau dichroique utilisant une del bleue a phosphore vert |
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WO2007100534A1 (fr) * | 2006-02-28 | 2007-09-07 | Corning Incorporated | Collecteur et concentrateur de lumière |
WO2008015617A2 (fr) * | 2006-07-31 | 2008-02-07 | Koninklijke Philips Electronics N.V. | Dispositif photoémetteur |
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US20060113544A1 (en) * | 2002-12-13 | 2006-06-01 | Koji Otsuka | Semiconductor light-emitting device, method for manufacturing same, and linear light source |
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WO2005050262A2 (fr) * | 2003-11-14 | 2005-06-02 | Light Prescriptions Innovators, Llc | Combineur de faisceau dichroique utilisant une del bleue a phosphore vert |
US20060023449A1 (en) * | 2004-07-27 | 2006-02-02 | Lee Kye-Hoon | Illuminating unit and projection-type image display apparatus employing the same |
WO2007100534A1 (fr) * | 2006-02-28 | 2007-09-07 | Corning Incorporated | Collecteur et concentrateur de lumière |
WO2008015617A2 (fr) * | 2006-07-31 | 2008-02-07 | Koninklijke Philips Electronics N.V. | Dispositif photoémetteur |
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US9151463B2 (en) | 2010-12-29 | 2015-10-06 | 3M Innovative Properties Company | LED color combiner |
WO2014045137A1 (fr) * | 2012-09-21 | 2014-03-27 | Koninklijke Philips N.V. | Ensemble électroluminescent, lampe et dispositif d'éclairage |
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