WO2015082575A1 - Dispositif optique, dispositif d'éclairage et système d'éclairage - Google Patents

Dispositif optique, dispositif d'éclairage et système d'éclairage Download PDF

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Publication number
WO2015082575A1
WO2015082575A1 PCT/EP2014/076473 EP2014076473W WO2015082575A1 WO 2015082575 A1 WO2015082575 A1 WO 2015082575A1 EP 2014076473 W EP2014076473 W EP 2014076473W WO 2015082575 A1 WO2015082575 A1 WO 2015082575A1
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WO
WIPO (PCT)
Prior art keywords
optical
elements
major surface
light guide
lighting
Prior art date
Application number
PCT/EP2014/076473
Other languages
English (en)
Inventor
Hendrikus Hubertus Petrus Gommans
Wilhelmus Petrus Adrianus Johannus Michiels
Marcellinus Petrus Carolus Michael Krijn
Original Assignee
Koninklijke Philips N.V.
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Application filed by Koninklijke Philips N.V. filed Critical Koninklijke Philips N.V.
Publication of WO2015082575A1 publication Critical patent/WO2015082575A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • 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
    • G02B19/0033—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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional 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 an optical device that can be used to collimate the luminous output of a lighting device such as a luminaire.
  • the present invention further relates to a lighting device comprising such an optical device.
  • the present invention yet further relates to a lighting system comprising a plurality of such lighting devices.
  • a certain type of luminous output such as a homogeneous or collimated luminous output.
  • a homogeneous or collimated luminous output is desirable to create a suitable working environment.
  • a homogeneous or collimated output is considered desirable to create a suitable working environment.
  • Other application domains will be apparent to the skilled person.
  • Micro- lens arrays homogenize light by creating an array of overlapping diverging cones of light. Each cone originates from a respective micro-lens and diverges beyond the focal spot of the lens. In the known arrays, the individual lenses are identical to each other.
  • Ground glass diffusers are formed by grinding glass with an abrasive material to generate a light-scattering structure in the glass surface.
  • a luminaire in which a plurality of solid state lighting elements such as a light emitting diodes (LEDs) are arranged to direct their luminous output towards a micro-optical foil that comprises a plurality of collimating elements with each of the collimating elements being associated with one of the solid state lighting elements.
  • LEDs light emitting diodes
  • the ability of shaping the light by the foil depends on the angular spread of the light entering the foil at any location. The smaller the beam width of the incoming light, the more precise the light can be redirected by the foil.
  • each collimating element of the micro-optical foil is substantially associated with a single solid state lighting element only, because an increasing number of solid state lighting elements associated with such a collimating element equates to an increasing angular spread in the incident light, which therefore equates to a reduced efficiency of the coUimation.
  • US 2006/0146573 Al discloses a light guide plate including a first light guide layer made of a material having a refractive index n 1 , and a scattering light guide layer hav ing a function o scattering light.
  • a light emitting diode is arranged alongside the light guide layer for coupling light into the light guide layer sideways.
  • the scattering light guide layer comprises a plurality of scattering elements to generate an angular light distribution below the critical angle of the light guide, i.e. the angle above which total internal reflection occurs.
  • the present invention seeks to provide an optical device that can be used to produce a highly collimated luminous output in such lighting devices.
  • the present invention further seeks to provide a lighting device comprising such an optical device.
  • the present invention yet further seeks to provide a lighting system
  • an optical device comprising a first major surface and a second major surface opposite the first major surface, wherein the second major surface comprises a grid of tessellated optical elements, each tessellated optical element comprising concentrically arranged around the center of the optical element a plurality of polygonal rings having reflective facets
  • optical elements of such an optical device may be accurately aligned with scattering elements of a light guide-based lighting device such that each optical element aligns with a separate scattering element, wherein the reflective facets, e.g. total internal reflection facets, of the optical elements are arranged to receive a different portion of the angular spread of light generated by such a scattering element, and are shaped to produce a collimated luminous output for such a portion of the incident light. Furthermore, by arranging the optical elements in a tessellated fashion, bleeding of light through spaces in between the optical elements is avoided, thereby further improving the collimation of the light generated by the optical device.
  • Tessellation of a flat surface is the tiling of a plane using one (or more) geometric shapes, called tiles, with no overlaps and no gaps, or in other words, tessellation is a repeating pattern of similar or identical shapes which fills a surface.
  • the polygonal rings, of which the reflective facets of an outer rings forms the complete perimeter of the tessellation optical element, are bounded by straight lines which together, for example, form a triangular, square, rectangular or hexagonal shape.
  • each tessellated optical element further comprises a refractive element in said center.
  • This arrangement yields a particularly high degree of collimation because the refractive element can effectively collimate incident light at relatively low angles of incidence, whereas the reflective facets can effectively collimate incident light at higher angles of incidence.
  • the refractive element may be spherical or aspherical. Aspherical for instance may be beneficial if the optical device has a different refractive index then the light guide, wherein the aspherical degree of the refractive element, e.g. a lens element, can be chosen to compensate for the refraction between the light guide and the optical device, in particular to correct for spherical aberrations originating from the short distance between a scattering element and the refractive element, i.e. a low f number, which causes the focal point to smear out. This may for instance be compensated by the inclusion of a modification near the rim of a refractive element, e.g. lens, which causes the curvature of the refractive element to deviate from a spherical shape.
  • the aspherical degree of the refractive element e.g. a lens element
  • the tessellated optical elements are typically identical to ensure the desired homogeneous output although theoretically it is possible to have different optical elements, for instance if a lighting device comprises an irregular pattern of scattering elements.
  • the tessellated optical elements have a hexagonal shape.
  • a hexagonal shape is particularly preferred because it more closely approximates a circular shape compared to e.g. a square optical element, which therefore gives a better performance when combined with circular scatter elements.
  • optical device can be kept extremely thin; in an embodiment, the optical device is a foil having a thickness of less than 1.0 mm. Moreover, each reflective facet may have a height not exceeding 0.15 mm.
  • a lighting device comprising a light guide having a first major surface and a second major surface opposite the first major surface, the first major surface being connected to the second major surface by respective side surfaces; a plurality of solid state lighting elements arranged along at least one of said side surfaces, wherein each solid state lighting element is arranged to emit its luminous output into the light guide via said side surface; and the optical device according to one or more of the aforementioned embodiments, wherein the optical device faces the second main surface of the light guide; and wherein the first main surface of the light guide comprises a pattern of scattering elements, each scattering element being aligned with the center of one of said optical elements.
  • Such a lighting device e.g. a luminaire
  • a luminaire can achieve a high degree of collimation in its luminous output due to the alignment of the scattering elements with the respective optical elements of the optical film of the present invention.
  • the solid state lighting elements are arranged alongside opposite side surfaces of the light guide to increase the luminous output intensity generated by the lighting device.
  • the scattering elements may be Lambertian scatter dots.
  • the distance between neighboring scattering elements is at least 2h* tan(9), wherein h is the distance between the first major surface and the second major surface of the light guide and ⁇ is the critical angle of the light guide.
  • the optical device may contact the light guide to reduce such interference as much as possible.
  • the optical device may be spatially separated from the light guide. This for instance may be advantageous for improving intermixing of the light originating from different solid state lighting elements such as LEDs.
  • a lighting system comprising a plurality of the lighting devices according to one or more embodiments of the present invention.
  • a lighting system may for instance be a modular system for integration in a (suspended) ceiling, or may form part of a suspended ceiling system.
  • Fig. 1 schematically depicts an optical device according to an embodiment of the present invention
  • Fig. 2 schematically depicts a top view of an aspect of the optical device of
  • Fig. 3 schematically depicts a cross-section of the aspect of the optical device of Fig. 1;
  • Fig. 4 schematically depicts a cross-section of an aspect of an optical according to another embodiment of the present invention.
  • Fig. 5 schematically depicts a cross-section of a lighting device according to an embodiment of the present invention
  • Fig. 6 schematically depicts a top view of a part of the lighting device of Fig. 5;
  • Fig. 7 schematically depicts the operating principle of the lighting device of Fig. 5;
  • Fig. 8 schematically depicts a cross-section of a lighting device according to another embodiment of the present invention.
  • Fig. 9 depicts the simulation result of a degree of collimation achieved with a lighting device according to an embodiment of the present invention
  • Fig. 10 depicts the simulation result of a degree of collimation achieved with a lighting device according to another embodiment of the present invention.
  • Fig. 1 schematically depicts a top view of an optical device 10 in accordance with an embodiment of the present invention.
  • the optical device 10 comprises a plurality of optical elements 20, which are tessellated to form a tessellated grid of optical elements 20, i.e. a grid without gaps between the optical elements 20.
  • the optical elements 20 are shown to have a hexagonal shape although it should be understood that other shapes suitable to form such a tessellated grid may also be used, e.g. squares.
  • hexagonally shaped optical elements 20 is that these shapes more closely resemble a circular shape than for instance square shaped optical elements, which improves the optical performance of the optical elements when used in conjunction with a circular scattering element as will be explained in more detail later.
  • the optical elements 20 are all identical. This for instance is a suitable embodiment when each optical element 20 receives a substantially similar, e.g. identical, luminous distribution. It should however be understood that in embodiments where different optical elements 20 receive light of a different nature, e.g. light having a different angular distribution, some of the optical elements 20 may be different to some other optical elements 20. In such a scenario, each optical element 20 may be individually designed as a function of the luminous distribution the optical element 20 is expected to receive.
  • an optical device 10 may comprise any suitable number of optical elements 20, such as for example at least 100 optical elements, typically 5,000 or 10,000 optical elements, even up to 100,000, 1,000,000 optical elements or more.
  • the optical device 10 may be made of any suitable optical material, e.g. a material having suitable transparency.
  • the optical device 10 is made of a material having a high refractive index, i.e. a refractive index of at least 1.45 respective to air at 589 nm.
  • Suitable high refractive index materials include for example glass, poly (methyl methacrylate) (PMMA), polyethylene (PE), and polycarbonate (PC), although other suitable materials will be apparent to the skilled person. This has the advantage that incident light over relatively large angles of incidence can be effectively collimated due to the high refractive index of the material of the optical device 10.
  • the optical device 10 is made in one piece such as a foil or plate.
  • Such embodiments are relatively easy to handle, and relatively easily adaptable in shape and size to substrates and/or lighting devices.
  • the advantage of being in one piece is that cumbersome mutual attachment of the plurality of optical elements 20, as is done in some prior art optical devices, is avoided.
  • the optical elements 20 are easily obtainable in sheet, plate or foil material via laser ablation, thus the plurality of optical elements 20 can be formed in sheet, plate of foil material made in one piece. Said one piece material could easily be shaped into a desired shape if required.
  • FIG. 2 A top view of an optical element 20 is shown in Fig. 2, whereas Fig. 3 schematically depicts a cross-section of the optical element 20 along the dashed line shown in Fig. 2.
  • Each optical element 20 is designed to operate as a micro-collimator.
  • the optical element 20 comprises a central element 22 that is centered around the central (symmetry) point 23 of the optical element 20 and a plurality of reflective facets 24 that are arranged as a polygonal ring, the plurality of rings being arranged in a concentric pattern around the central element 22.
  • the optical element 20 comprises a plurality of hexagonally shaped faceted rings 24, with a first of said rings being arranged around the central element 22 and each next ring being arranged around the previous ring of said plurality.
  • Each optical element has a perimeter 21 which is completely bounded or formed by reflective facets 24-1, 24-2, 24-3, 24-4, 24-5, 24-6 of the outer faceted ring 24.
  • Such collimator designs are known per se. However, it has not been previously reported to miniaturize such designs into micro-optical elements 20 and to combine such elements into an optical device 10.
  • the facets 24 preferably are total internal reflection facets and typically define a second major surface 26 of the optical device 10, which second major surface 26 is arranged opposite a first major surface 25.
  • the first major surface 25 is arranged as the light entry surface of the optical device 10, wherein the second major surface at least in part defined by the facets 24 is arranged as the light exit surface of the optical device 10.
  • the first major surface 25 is arranged as the light exit surface of the optical device 10, wherein the second major surface at least in part defined by the facets 24 is arranged as the light entry surface of the optical device 10.
  • each facet 24 will have a different angle relative to the optical axis (i.e. the axis perpendicular to the first main surface 25 that extends through the central point 23), which angle is selected based on the angle of incidence of the incident light relative to the optical axis; for instance, facets 24 closer to the central point 23 may have a sloped surface under a smaller angle with the optical axis than facets 24 further away from this central point, because the latter facets 24 are arranged to receive light at a higher angle of incidence.
  • the optimization of individual facets 24 to generate the desired degree of collimation is considered to be a routine skill for the person skilled in the art, this is not explained in further detail for the sake of brevity only.
  • the optical device 10 can be kept extremely thin, especially when using the aforementioned high refractive index materials.
  • the total height or thickness H TOT can be as little as 1.0 mm or less, whereas the total height H FAC of each facet 24 can be as little as 0.15 mm or even 0.05 mm for a facet 24 having a 45° slope.
  • the total height or thickness H TOT can be as little as 1.0 mm or less
  • the total height H FAC of each facet 24 can be as little as 0.15 mm or even 0.05 mm for a facet 24 having a 45° slope.
  • only three facets 24 are shown by way of non-limiting example only. It should be understood that such facets 24 typically have a width that is comparable to their height, e.g. a width of around 0.15 mm or 0.05 mm. Consequently, each optical element 20 may comprise a substantially larger number of such facets 24, e.g. 100 or more of such facets.
  • the optical elements 20 typically are micro-optical elements, i.e. optical elements having dimensions of only a few, e.g. 5 or 10 centimeters or less.
  • the length of a side of an optical element 20 may be chosen in the range of 5-25 mm.
  • the central element 22 is shown as a reflective element in Figs. 2 and 3.
  • the central element 22 may be a refractive element such as a lens. Such an embodiment is shown in Fig. 4.
  • the refractive element 22 is implemented as a Fresnel lens. As will be understood by the skilled person, this for instance is useful if a central portion of the incident light has a relatively small angle of incidence, e.g. 45° or less, in which case the refractive element 22 is particularly suited to generate a collimated luminous output for this central portion of the incident light, with the reflective facets 24 being arranged to receive light at angles of incidence of greater than 45°.
  • the refractive element 22 is an aspherical lens.
  • Such an aspherical lens may be used to correct for spherical aberrations originating from the short distance between a scattering element and the refractive element 22, i.e. a low f number, which causes the focal point generated by a (spherical) lens to smear out. This may for instance be compensated by the inclusion of a modification near the outer edge or rim of the refractive element 22, e.g. lens, which modification causes the curvature of the refractive element to deviate from a spherical shape.
  • the refractive element 22 and the reflective elements 24 are shown as part of the same surface of the optical element 20, i.e. the second major surface 26. It should however be understood that it is equally feasible to provide an optical device 10 in which the (refractive and) reflective portions of the optical elements 20 are divided between the first major surface 25 and the second major surface 26, i.e. at least some of the (refractive and) reflective elements 22 and 24 are located on the first major surface 25. As will be immediately understood by the skilled person, the appropriate configuration for such optical elements 20 will be governed by design requirements, e.g. the nature of the light source to be collimated.
  • Fig. 5 schematically depicts a lighting device 100 according to an embodiment of the present invention.
  • the lighting device 100 is shown to be a luminaire, although it should be understood that the lighting device 100 may take any other suitable shape.
  • the lighting device 100 comprises a plurality of solid state lighting elements 110, e.g. LEDs, which may be any suitable LEDs, e.g. LEDs comprising an organic or inorganic semiconductor layer.
  • the LEDs may be mounted on any suitable carrier, e.g. a printed circuit board, and may comprise additional layers or components, e.g. a phosphorus layer, to provide the LED with the desired characteristics, e.g. color point, color temperature and so on.
  • the solid state lighting elements 110 are typically arranged along one or more side surfaces 126 of a light guide 120, which side surfaces 126 connect a first major surface 122 to the second major surface 124 of the light guide 120. In other words, the first major surface 122 is arranged opposite to the second major surface 124.
  • the solid state lighting elements 110 are arranged to direct their luminous output into the light guide 120, i.e. the luminous surfaces of the respective solid state lighting elements 110 face the corresponding side surface 126.
  • solid state lighting elements 110 are arranged alongside at least two opposing side surfaces 126. Solid state lighting elements 110 may be arranged along each of the side surfaces 126.
  • the solid state lighting elements 110 may be mounted alongside the side surfaces 126 in any suitable manner, for instance by attaching them to the housing (not shown) of the lighting device 100.
  • the light guide 120 may be made of any suitable optical material, i.e. any material suitable for providing total internal reflection of incident light originating from the solid state lighting elements 110 under angles above the critical angle ⁇ of the light guide 120.
  • the light guide 120 may be made of a suitable glass or a suitable polymer material such as PMMA, PE, PET, PC and so on.
  • the light guide 120 has a thickness in the range of 0.5 - 5 mm, e.g. 1mm.
  • the dimensions of the optical elements 20 may be tailored to the thickness of the light guide 120, as an increased thickness corresponds to a larger optical path from the first major surface 122 to the second major surface 124, which therefore increases the width of the luminous profile generated by each scattering element 130.
  • each optical element 20 may have sides of 12.5 mm length.
  • the light guide 120 comprises a pattern of scattering elements 130 on the first major surface 122, with the optical device 10 according to an embodiment of the present invention facing the second major surface 124.
  • the second major surface 26 of the optical device 10 faces the second major surface 124 of the light guide 120.
  • the first major surface 25 of the optical device 10 may face the second major surface 124 for instance if so dictated by optical requirements.
  • the scattering elements 130 may for instance be Lambertian scatter dots. The scattering elements 130 generate light that can escape the light guide 120 by scattering incident light under angles smaller than the critical angle ⁇ of the light guide 120.
  • a ray of light may have to be scattered by one of the scattering elements 130 multiple times before the light is scattered under an angle that is small enough to escape the total internal reflection of the light guide 120.
  • Scattering elements are known per se and it suffices to say that any suitable scattering element 130 may be selected, e.g. dots of white paint by way of non-limiting example.
  • Each scattering element 130 is aligned with the central point 23 of one of the optical elements 20 of the optical device 10 as indicated by the dashed lines in Fig. 5. This is shown in more detail in Fig. 6, which depicts a top view of a part of the lighting device 100.
  • the scattering elements 130 can be seen through the optical elements 20 with which they are aligned. Consequently, the scattering elements 130 are laid out in a hexagonal pattern, as mandated by the hexagonal shape of the optical elements 20.
  • the light guide 120 ensures that light generated by different solid state lighting elements 110 is mixed before exiting the light guide 120, as each array of light is typically reflected several times by one of the first major surface 122 and the second major surface 124 before escaping the light guide 120 by scattering through one of the scattering elements 130.
  • each optical element 20 is arranged relative to a scattering element 130 such that each optical element 20 predominantly receives the scattered luminous output of a single scattering element 130, i.e. from the scattering element 130 that is aligned with the optical element 20.
  • This therefore provides the appearance of each optical element 20 being associated with a single light source (e.g. a single LED) without the disadvantages of color differences between different optical elements 20 due to the mixing of the luminous output from different LEDs by the light guide 120. This furthermore avoids the appearance of glary spots when looking at the lighting device 100.
  • the distance between neighboring scattering elements 130 is at least 2h* tan(9), wherein h is the distance between the first major surface and the second major surface, i.e. the thickness of the light guide 120, and ⁇ is the critical angle of the light guide 120.
  • h is the distance between the first major surface and the second major surface, i.e. the thickness of the light guide 120
  • ⁇ is the critical angle of the light guide 120.
  • each optical element 20 may be designed to collimate the luminous distribution received from the corresponding scattering element 130.
  • the central element 22 and the reflective facets 24 are shaped as a function of the angle of incidence of the light originating from scattering element 130 travelling through light guide 120 in order to ensure a high degree of collimation of the incident light indicated by the dashed lines.
  • the facets 24 can be dimensioned in the micron domain, e.g. having a width and height of around 50 microns, such that a relatively small range of angles of incidence are received by a single facet 24, thereby achieving a high degree of collimation.
  • the optical elements 20 of the optical device 10 may not collect the luminous distribution produced by a scattering element 130 over its full area, but may instead only receive this distribution on a central portion of the optical element 20.
  • each scattering element 130 generates light exiting the light guide 120, which light has a luminous distribution having an angular spread determined by the critical angle of the light guide 120, i.e. the angle of which total internal reflection occurs.
  • each scattering element 130 will create a luminous distribution in a range from - ⁇ to ⁇ . This distribution will fan out upon exiting the light guide 120 at the second major surface 124 (as shown in Fig. 7 and 8), such that the area of each optical element 20 illuminated by the (highest intensity part of the) luminous distribution generated by its corresponding scattering element 130 will be determined by the distance between the optical element 20 and the second major surface 124 of the light guide 120.
  • Fig. 8 schematically depicts an alternative embodiment of a lighting device 100 in which the optical device 10 is separated from the second major surface 124 of the light guide 120 by a distance D.
  • each optical element 20 may collect the (highest intensity part of the) luminous distribution generated by each scattering element 130 over a larger region of the optical element 20, i.e. the luminous distribution illuminates a larger area of the optical element 20. Consequently, the beam portions received by respective facets 24 become narrower because each facet 24 receives a smaller (angular) portion of the luminous distribution, such that a higher degree of collimation can be obtained. It is noted that optical elements 20 in Fig. 8 are shown to be larger than the optical elements 20 in Fig.
  • Fig. 8 schematically depicts the maximum distance D at which the optical device 10 may be placed relative to the second major surface 124, as beyond this distance the luminous distributions generated by neighboring scattering elements 130 will start to overlap such that optical elements 20 will receive light generated by multiple scattering elements 130, e.g. from the scattering element 130 aligned with such an optical element 20 as well as from neighboring scattering elements 130.
  • the radius of the scattering elements 130 may also be varied in order to control the degree of collimation produced by the lighting device 100.
  • a higher degree of collimation already can be achieved by the addition of the optical device 10 and by varying the distance between the optical device 10 and the light guide 120 as explained above, but a further degree of control can be achieved by variation of the aforementioned radius.
  • Figs. 9 and 10 depict the luminous intensity distribution produced by a luminaire 100 comprising an optical device 10 having optical elements 20 with sides having a length of 12.5 mm and scattering elements having a radius of 1 mm (Fig. 9) and 2 mm (Fig. 10) respectively.
  • the optical device 10 was simulated to be 2.5 mm above the light guide 120 having a thickness of 1 mm.
  • the full- width half-maximum (FWHM) of these light distributions which is an expression of the degree of collimation achieved by the luminaire 100, is 12° and 20° respectively.
  • the loss of efficiency as a trade-off against the improved collimation when reducing the size of the scattering elements 130 may be less critical when the arrangement of the solid-state lighting elements 110 around the edges or side surfaces 126 of the light guide 120 ensures that a high density of such solid state lighting elements 120 can be achieved.
  • the use of a micro-structured optical device 10 when aligned with the pattern of scattering elements 130 as described above ensures an improved control over this trade-off, which therefore may yield an overall performance increase of the lighting device 100.
  • the lighting device 100 may be included in a lighting system that comprises a plurality of such lighting devices 100, for instance as tiles in a modular system such as a suspended ceiling system, a suspended wall system and so on.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Cette invention concerne un dispositif optique (10) destiné à être utilisé en tant que collimateur dans un dispositif d'éclairage (100). Ledit dispositif optique (10) comprend une première surface majeure (25) et une second surface majeure comprenant un réseau d'éléments optiques en damier (20) dont chacun comprend une pluralité de facettes réfléchissantes (24) agencées de manière concentrique autour du centre (23) de l'élément optique. Ledit dispositif d'éclairage comprend en outre un guide d'ondes optique (120) présentant une première surface principale (122) et une seconde surface principale (124) reliée à la première surface principale par des surfaces latérales respectives (126). Une pluralité d'éléments d'éclairage à semi-conducteur (110) est disposée le long d'au moins une desdites surfaces latérales et conçue pour émettre son rendement lumineux à l'intérieur dudit guide d'ondes optique par l'intermédiaire de ladite surface latérale. Ledit dispositif optique (10) est orienté face à la seconde surface principale du guide d'ondes optique et la première surface latérale du guide d'ondes optique comprend un motif d'éléments de diffusion (130), chaque élément de diffusion étant aligné avec le centre (23) d'un desdits éléments optiques (20). L'invention concerne en outre un système d'éclairage comprenant une pluralité de dispositifs d'éclairage de ce type (100).
PCT/EP2014/076473 2013-12-05 2014-12-04 Dispositif optique, dispositif d'éclairage et système d'éclairage WO2015082575A1 (fr)

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EP13195863 2013-12-05
EP13195863.9 2013-12-05

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WO2015082575A1 true WO2015082575A1 (fr) 2015-06-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015104088U1 (de) * 2015-08-05 2016-11-09 Zumtobel Lighting Gmbh Leuchtenoptik sowie Leuchte aufweisend die Leuchtenoptik
AT15384U1 (de) * 2015-10-09 2017-07-15 Zumtobel Lighting Gmbh Anordnung zur Lichtabgabe
CN113237007A (zh) * 2021-05-26 2021-08-10 嘉兴追光智能科技有限公司 照明模组及照明灯具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426790A1 (fr) * 2002-12-05 2004-06-09 Kabushiki Kaisha Toyota Jidoshokki Elément optique, unité d'illumination planaire et unité d'affichage à cristaux liquides
US20070147041A1 (en) * 2005-10-14 2007-06-28 Kabushiki Kaisha Toshiba Lighting system
WO2009087587A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Système d'éclairage
WO2013011410A1 (fr) * 2011-07-20 2013-01-24 Koninklijke Philips Electronics N.V. Élément d'éclairage, système d'éclairage et luminaire produisant une apparence de lumière naturelle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426790A1 (fr) * 2002-12-05 2004-06-09 Kabushiki Kaisha Toyota Jidoshokki Elément optique, unité d'illumination planaire et unité d'affichage à cristaux liquides
US20070147041A1 (en) * 2005-10-14 2007-06-28 Kabushiki Kaisha Toshiba Lighting system
WO2009087587A1 (fr) * 2008-01-08 2009-07-16 Koninklijke Philips Electronics N.V. Système d'éclairage
WO2013011410A1 (fr) * 2011-07-20 2013-01-24 Koninklijke Philips Electronics N.V. Élément d'éclairage, système d'éclairage et luminaire produisant une apparence de lumière naturelle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015104088U1 (de) * 2015-08-05 2016-11-09 Zumtobel Lighting Gmbh Leuchtenoptik sowie Leuchte aufweisend die Leuchtenoptik
AT15384U1 (de) * 2015-10-09 2017-07-15 Zumtobel Lighting Gmbh Anordnung zur Lichtabgabe
CN113237007A (zh) * 2021-05-26 2021-08-10 嘉兴追光智能科技有限公司 照明模组及照明灯具

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