EP3446030B1 - Kieselsteinplattenähnliches gitterabdeckung - Google Patents

Kieselsteinplattenähnliches gitterabdeckung Download PDF

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Publication number
EP3446030B1
EP3446030B1 EP17717432.3A EP17717432A EP3446030B1 EP 3446030 B1 EP3446030 B1 EP 3446030B1 EP 17717432 A EP17717432 A EP 17717432A EP 3446030 B1 EP3446030 B1 EP 3446030B1
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EP
European Patent Office
Prior art keywords
light
louvre
cells
lighting unit
unit
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EP17717432.3A
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English (en)
French (fr)
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EP3446030A1 (de
Inventor
Peter John FRANCK
Thomas DEFLANDRE
Ronald Cornelis DE GIER
Mark Johannes Antonius VERHOEVEN
James Jehong KIM
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Signify Holding BV
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Signify Holding BV
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    • 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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • 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 invention relates to a louvre unit.
  • the invention further relates to a lighting unit with louvres.
  • Louvre containing luminaires are known in the art.
  • US 4,613,929 describes a troffer extension attachable to the walls of a lighting troffer, and with portions of a ceiling to raise the troffer relative to the ceiling, and having extension members, upper devices on one end of the members for engaging the troffer, and, lower devices on the other ends of the members for engaging the ceiling.
  • the louvre is essentially a series of longitudinal and lateral metal strips interlocked in egg-crate fashion, defining a series of equally sized rectangular or square openings. The louvre is placed in the dead space beneath the lighting tubes, and has a lower edge which is generally flush with the plane of the ceiling.
  • US 3,313,932 discloses a louvre unit according to the preamble of claim 1.
  • Slim downlights are becoming more and more dominant on the market, because of their ease of mounting and integration in the overall building design. Key in such design may be the minimized height in relation to the diameter.
  • the products may be provided with a large light emitting surface. Especially, such product may have a Lambertian light distribution and therefore may have a relative high luminance intensity at higher viewing angles.
  • Beam shaping of the light can be done by using e.g. TIR (Total Internal Reflection) elements that change the direction of the light.
  • the size of the optic is directly related to the size of the source. So, if the total light emitting surface of a slim downlight is seen as one source, the optic element becomes very high in respect to the source, such that the required height of the lighting unit become too large (or the diameter or width becomes smaller than desired).
  • a solution may be found in having multiple small light sources that have an individual optic in front, and together function as a whole. Since the source is made much smaller, the optic element can also be made much smaller. The problem then becomes how to create the small sources and how to align the sources to all the optics, also e.g. including thermal expansion effects.
  • an alternative lighting unit which preferably further at least partly obviates one or more of above-described drawbacks, which may especially be relatively thin. It is further an aspect of the invention to provide an alternative louvre unit (for application to a(n existing) lighting unit), which may have a random appearance which is nevertheless relatively easy designable.
  • a solution is provided wherein with a plurality of unique louvre cells (“cells”), such as e.g. 13 unique cells, a louvre design is created. These unique cells are combined in a so-called tile (herein also indicated as “domain” or “subset”). This tile is used to fill the whole plate. With such arrangement, a randomized look and feel is created with only limited design and engineering work and this can be repeated for different product shapes and sizes.
  • a louvre unit can be designed by e.g. starting in the design phase with creating a rotational symmetric optic for generating the expected intensity beam.
  • This optic is duplicated to have m (such as 13) individual reflectors close to each other for instance in a hexagonal array.
  • the shape of a number of the optics is changed from circular into k (such as 13) unique shapes. This reduces the dark areas in between the cells and increases the efficacy of the total optical system.
  • the tile can be duplicated (n times) to fill the whole surface. In such a way, a design can be created that can be used in producing light exit units with louvre cells.
  • the invention further provides a lighting unit (herein also indicated as “unit”) comprising (i) a plurality of light sources for generation of lighting unit light, and (ii) a light exit unit for escape of at least part of said lighting unit light from the lighting unit, wherein the light exit unit comprises the louvre unit.
  • unit a lighting unit
  • the louvre cells form a tessellated surface of the domain, and/or the domains form a tessellated surface of the light exit window.
  • the polygons have rounded corners.
  • each domain comprises at least three polygons of incongruent shape” means that the louvre cells do not match in shape when enlarged to the same size.
  • the domain comprises at least one 3-sided, one 4-sided and one 8-sided polygon, or that the polygons in a domain all have the same number of louvre walls, for example are all 6-sided polygons but with mutually different lengths of the louvre wall forming a closed loop and with different angles between the louvre walls.
  • a combination of the abovementioned features of an incongruent shape is applied, thus creating a very attractive (semi-)randomized look and feel.
  • the domains includes louvres cells, with the domain only having C1 symmetry, but with the domains ordered in a substantially regular structure. In such embodiments, all domains may be substantially equal.
  • a lighting unit may be provided that can e.g. be used for office lighting, which has a relatively thin body, and which can provide light with the desired glare properties.
  • Such lighting unit may allow a low height of the lighting unit in respect to e.g. a length, a width or a diameter of the lighting unit. Further, such a lighting unit especially may be a slim or shallow lighting unit. Further, such lighting unit may allow an effective passive and/or active cooling.
  • Such lighting unit may allow lighting of a closed or open space, such as a room, an office, a store, a shop window, etc. In embodiments (see also below), such lighting unit may be integrated in a ceiling or a wall. In other embodiments such lighting unit may be arranged in a (motorized) vehicle, especially allowing lighting a street or the inside of the vehicle, etc.
  • equivalent cross-sections of louvre cells means the cross section of a circle having the same cross-sectional surface area of the (irregular) polygonal shape of the louvre cell.
  • the lighting unit comprises a plurality of light sources for generation of lighting unit light.
  • a light source may provide light source light.
  • the light sources comprise solid state LED light sources (such as LEDs or laser diodes).
  • the plurality of light sources especially may comprise a plurality of LED light sources.
  • the plurality of (LED) light sources comprise one type of (LED) light source.
  • the plurality of (LED) light sources comprise at least two types of (LED) light sources configured to provide light source light with different spectral distributions, such as LEDs from different bins. For instance, blue LEDs and yellow LEDs, or blue LEDs and green LEDs and red LEDs may be provided. Such combination may be arranged to be able to provide white light.
  • the colors of the different LEDs may be mixed in the light mixing chamber.
  • the plurality of lights sources may include two or more subsets of light sources with each light source configured to provide substantially the same light (same spectral distribution), or with each subset configured to provide substantially the same light (same spectral distribution), or with two or more subsets configured to provide light with different spectral distributions.
  • one or more light sources are configured to provide white light.
  • one or more subsets are configured to provide white light, and one or more other subsets are configured to provide colored light.
  • two or more subsets are configured to provide white light with different spectral distributions, such as having different correlated color temperatures.
  • the spectral distribution of lighting unit light i.e. the light provided by the lighting unit
  • the lighting unit may comprise a control system configured to control one or more of the intensity of the light sources and the color of the light sources.
  • the control system may be configured to (thereby) control one or more of the intensity of the lighting unit light, the spectral distribution of the lighting unit light, and a beam shape of the lighting unit light.
  • the lighting unit light may essentially consist of the light source light.
  • the lighting unit light may comprise converted light source light.
  • the lighting unit may comprise a luminescent material that can be excited by the light source light.
  • the luminescent material light (or converter light) may be comprised by the lighting unit light, optionally in combination with (some) remaining light source light. Therefore, the plurality of light sources are configured to generate lighting unit light, with the lighting unit light being generated directly (i.e. essentially light source light) and/or indirectly (due to conversion of at least part of the light source light into luminescent material light).
  • a luminescent material may be comprised by walls, may be coated to faces, or may be embedded in a waveguide.
  • the plurality of light sources is configured for generation of lighting unit light (directly (lighting unit light essentially consists of light source light) and/or indirectly (lighting unit light at least comprises luminescent material light)).
  • the lighting unit may be designed in all kind of ways. At least part of the lighting unit light escapes from the lighting unit via a light exit unit.
  • the light exit unit is a kind of light exit window.
  • the term "light exit unit” may also refer to a plurality of light exit units.
  • the light exit window is especially configured to provide lighting unit light with a specific angular distribution (and/or beam shape). For instance, the light exit window may be configured to provide light with low glare.
  • a beam of light may be provided with cut-off angles of 65° or smaller, wherein at angles larger than the cut-off angle, the luminance is equal to or smaller than 1000 Cd/m 2 , such as equal to or smaller than 800 Cd/m 2 . Also cut-off angles smaller, or optionally larger than 65° may be chosen, dependent upon the application. With the lighting unit, it may be possible to define the cut-off angle and/or the beam shape (of the lighting unit light).
  • Louvres may e.g. include plates or strips which divide an exit window of a lighting unit in parts, herein also indicated as cells. Such cells have in general a square or rectangular cross-section. Further, in general such louvres have a certain height, defining the walls of the cells, with the cross-sectional shape substantially not changing over the height, though in embodiments there may also be a variation, such as an increase with increasing distance of the light sources (e.g. tapered). Due to the use of louvres, luminance at larger angles is reduced or substantially blocked.
  • the louvres, and thereby the louvre cells are configured in regular patterns. In the present invention however, an irregular or especially a pseudo random pattern is used.
  • a light guide see also below
  • thin lighting units may be created that can be applied in all kind of applications, while having a small thickness (height) and having a pleasant appearance and good beam shaping properties.
  • the light exit unit is configured for escape of at least part of said lighting unit light from the lighting unit.
  • the light exit unit comprises a louvre unit.
  • Light of the lighting unit may substantially only escape from the lighting unit via the light exit unit.
  • light of the lighting unit may substantially only escape from the lighting unit via the louvre unit.
  • the light exit unit especially comprises a window that may essentially consist of a plurality of openings bordered by louvres. Each opening, confined by one or more louvres is indicated as louvre cell. Therefore the light exit unit comprises a plurality of louvre cells.
  • the louvre unit provides the light emitting surface of the lighting unit.
  • the louvre cells may not be configured in a fully random pattern, but are especially also not configured in a fully regular pattern.
  • the light exit unit comprises a plurality of n subsets each comprising a respective plurality of m louvre cells.
  • the number of subsets is at least 3, such as least 5, even more especially at least 7, but may be much larger, such as e.g. up to about 100000, like up to about 10000, such as up to about 1000.
  • the number of subset may depend upon the cross-sectional area of the light exit unit.
  • the light exit unit comprises in the range of 0.05-100 louvre cells per cm 2 cross-sectional area, especially in the range of 0.01-50 louvre cells/cm 2 , even more especially in the range of 0.01-10 louvre cells/cm 2 , such as 0.05-10 louvre cells per cm 2 , such as in the range of 0.1-5 louvre cells /cm 2 .
  • Each subset comprises a plurality of louvre cells. These louvre cells together form a subset or herein also called "domain”.
  • the domains or subset comprise louvre cells that are configured adjoined.
  • the aggregate of a plurality of louvre cells thus form a domain.
  • the louvre cells are especially configured in a 2D array of louvre cells.
  • the domain may also be indicated as conglomerate of louvre cells or agglomerated louvre cells. Each louvre cell in such domain shares a wall (or louvre) with at least one other louvre cell.
  • the domains are configured adjoined. The aggregate of a plurality of domains may thus especially form the louvre unit. Also the domains are especially configured in a 2D array of domains.
  • the louvre unit may also be indicated as conglomerate of domains or agglomerated domains.
  • the subsets comprise a plurality of louvre cells that may be selected from a limited number of possible louvre cells shapes.
  • domains may even differ from each other in number of louvre cells, arrangement of the louvre cells, number of louvre cells, but especially each subset comprise a plurality of louvre cells that may be selected from a limited number of possible louvre cells shapes.
  • each subset comprises one or more, especially a plurality of louvre cells shapes that is represented in each domain.
  • each domain comprises the same number and same type and same configuration of louvre cells.
  • the light exit unit comprises a plurality of domains of which at least part of the total number of domains is substantially identical, such as 2 or more, or at least 5, like at least 10 domains.
  • the domains may contain less louvre cells then domains more remote from a border in order to provide the desired shape of the border (round, square, rectangular, oval, etc.).
  • the louvre cells may be selected from a limited number of possible louvre cells shapes.
  • Each subset may include these k louvre cells.
  • the subset may also include other louvre cells which are not necessarily be represented in all other subsets.
  • each subset comprises a respective plurality of m louvre cells, wherein a plurality of k louvre cells within each domain have mutually differing louvre cell cross-sections, with 5 ⁇ m ⁇ 21 and 5 ⁇ k ⁇ m.
  • all louvre cells within the subsets are selected from the number of predefined k louvre cell shapes.
  • especially k m.
  • both k m with k being equal to or larger than 7.
  • the lighting exit unit comprises a plurality of louvre cells for beam shaping the lighting unit light
  • the plurality of louvre cells comprises a plurality of n subsets each comprising a respective plurality of m louvre cells, wherein the louvre cells of each subset are configured as domain of adjoining louvre cells, wherein a respective plurality of k louvre cells within each domain have mutually differing louvre cell cross-sections, wherein 3 ⁇ n ⁇ 100000, wherein 5 ⁇ m ⁇ 21, and wherein 5 ⁇ k ⁇ m.
  • a random appearance may be created, beam shaping may be well, while complexity can still be handled.
  • the higher m and the higher k the more random the lighting unit (i.e. the louvre unit) may be perceived.
  • beam shaping may be easier.
  • the higher m and k also the higher the complexity of the design.
  • a plurality of louvre cells within a domain have mutually differing louvre cell cross-sections.
  • the shape of the cross-section may be angular, but may also be rounded. Especially, rounded cross-sections may provide a kind of pebble structure.
  • the mutually differing louvre cell cross-sections especially differ in at least one of surface area size and shape. For instance, two equilateral triangles only differing in size have identical shapes. Likewise, two circles only differing in diameter have identical shapes. However, a circle and a triangle (even when having identical area sizes) differ in shape. Therefore, it is herein referred to "pebbles" as a multitude of pebbles may not include identically shaped pebbles.
  • the light exit unit may especially be combined with a light guide, such as a waveguide or an air guide.
  • the light sources may be configured to provide the light source light into the light guide.
  • the lighting unit may be configured such that light may escape from the light guide only via a limited number of faces, such as a single face. Due to reflections, such as due to total internal reflection (TIR), a substantial part of the (lighting unit) light may only escape from the light guide via such face.
  • TIR total internal reflection
  • the face may be the light exit unit. This may especially be the case when an air guide is applied.
  • a face of such waveguide may be used as light outcoupling face.
  • the light exit unit may be configured downstream of such light outcoupling face.
  • the unit comprises a light mixing chamber, wherein the plurality of light sources are configured to provide light source light in the light mixing chamber, wherein the light mixing chamber comprises a light exit face for escape of (light source) light from the light mixing chamber, wherein the light exit face may be comprised said light exit unit or wherein said light exit unit is configured downstream of said light exit face.
  • the plurality of light sources are configured to provide light source light in the light mixing chamber for providing said lighting unit light.
  • the light escaping from the light mixing chamber may include light source light and/or luminescent material light. Therefore, the light sources are configured for generating lighting unit light.
  • an air guide is configured as the light mixing chamber, and the light exit face is comprised said light exit unit.
  • the light mixing chamber in embodiments contains air.
  • the term “air guide” may also be used in relation to the "light mixing chamber” for embodiments comprising air.
  • the volume defined by the light mixing chamber is essentially filled with air.
  • the light source light provided by the light sources may be guided by the air guide from the light sources to the chamber openings (i.e. first louvre cell openings; see also below), directly and after (internal) reflection.
  • a waveguide is configured as the light mixing chamber, wherein the waveguide comprises said light exit face, and wherein said light exit unit is configured downstream of said light exit face.
  • an air guide is a light guide wherein air (or optionally another gas) is the medium wherein the light propagates.
  • a waveguide is a light guide wherein a solid (or optionally liquid) material) is the medium wherein the light propagates.
  • upstream and downstream relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is "downstream”.
  • the light guide may also be indicated as "light mixing chamber”.
  • the light mixing chamber comprises one or more faces, especially two faces, and especially an edge face.
  • the lighting unit comprises a "light mixing chamber", also herein referred to as "(light) mixing box”.
  • the light mixing chamber especially light source light provided by the plurality of light sources is mixed. At least part of the light source light provided by a light source may be reflected (see also below) in the light mixing chamber, e.g. at a location of a face and/or the edge face and may mix with light source light from another light source (or from the same light source light).
  • the light mixing chamber may mix light source light of light sources which have substantially identical spectral distributions or which differ in spectral distributions.
  • the plurality of light sources comprise light emitting faces, such as LED dies.
  • the plurality of light sources comprise light emitting faces, wherein the light emitting faces are configured within the light mixing chamber.
  • the light mixing chamber may in embodiments be defined by faces and an edge face.
  • the faces and the edge face may comprise different kind of shapes.
  • the faces may comprise a rectangular shape, a circular shape, an elongated shape, a curved shape, an undulating shape, a square shape, etc.
  • the faces may also comprise multiple shapes and/or the different faces may comprise different shapes.
  • the edge face may comprise different kinds of shapes, such as mentioned before in relation to the faces.
  • the edge face is arranged between (part of) an edge of a first face and (part of) an edge of a second face, especially to define the (light mixing) chamber.
  • the light mixing chamber may comprise a "free" shape.
  • the light mixing chamber comprises at least two faces and an edge face.
  • the edge face may comprise multiple edge faces, such as two edge faces, three edge faces (such as for a chamber with a triangular cross section), four edge faces (such as for a chamber with a square or rectangular cross section).
  • the light mixing chamber comprises exact two faces and an edge face (such as for a chamber with a circular or oval cross section). In other embodiments the light mixing box comprises more than two edge faces.
  • the faces are arranged substantial parallel (which includes parallel curved faces).
  • two faces comprise a circular shape and the edge face comprises a cylindrical shape.
  • the faces are configured parallel to each other and the edge face is located between the edges of the faces.
  • the light mixing chamber may comprise a disk-like shape.
  • the distance between the faces may substantially be the same over the light mixing chamber and a height of the light mixing chamber may be equal to the distance between the faces.
  • the first length of this disk-like shaped light mixing chamber may be equal to the maximum distance of a line connecting a first location at the edge of a face to a second location at the edge of said face, especially equal to the diameter of the faces.
  • two faces (especially arranged parallel to each other) comprise an elliptical shape having a major axis (or transverse diameter) and a minor axis (or conjugate diameter), and the first length of the light mixing chamber may be equal to the length of the major axis (especially when faces are configured such that a line connecting the center of the first face and the center of the second face is perpendicular to the major and minor axis).
  • a first face is curved and a second face is a flat face.
  • the (shortest) distance (height) between a first location at the first face and a second location at the second face may depend on the position of the location(s).
  • the light mixing chamber has a (flat) disk-like or (flat) plate-like shape.
  • the light mixing chamber may have a first length and a height.
  • the first length of the light mixing chamber may especially be defined by a characteristic distance, such as a width, a length or a diameter.
  • first length may refer to one or more of a length, a width, a diameter, a transverse diameter, a conjugate diameter, etc.
  • a second length may be chosen from a width, a length, a conjugate diameter or a transverse length, respectively.
  • a diagonal is selected (especially when faces are configured such that a line connecting the center of the first face and the center of the second face is substantially perpendicular to the major and minor axis).
  • the light chamber may have a disc-like shape or a beam-like shape, or a plate-like shape, etc.
  • one or more of the faces, even more especially both faces, are substantially flat.
  • the edge may be curved and/or consist of two or more square or rectangular elements.
  • a height of the light mixing chamber is smaller than a first length of the light mixing chamber.
  • the ratio of the first length of the light mixing chamber and the height of the light mixing chamber is selected from the range of 200:1 - 1:1, especially 200:1 - 2:1, such as 150:1 - 5:1, especially 100:1 - 10:1.
  • the first length is selected from the range of 20 mm - 2000 mm, such as 50 mm - 1000 mm, especially 50 mm - 500 mm.
  • the height of the light mixing chamber is selected from the range of 2 mm - 100 mm, such as 2 mm - 50 mm, especially 5 mm - 40 mm, even more especially 5 mm - 25 mm, such as 5 mm - 20 mm, especially 5 mm - 10 mm.
  • the height of the light mixing box is selected from the range of 15 - 20 mm.
  • the lighting unit, more especially the light mixing chamber has a ratio of the first length (L1) to the height (H) of 1 ⁇ L1/H ⁇ 100, such as 2 ⁇ L1/H ⁇ 100, even more especially 5 ⁇ L1/H ⁇ 100.
  • the light mixing chamber comprises one or more faces and an edge face, with the light mixing chamber having a height (H) smaller than a first length (L1) of the light mixing chamber.
  • the height of the light mixing chamber may vary over the first length and/or the (first) length may vary over height of the light mixing chamber.
  • the above indicated ratios may especially refer to maximum height and lengths.
  • the above indicated dimensions refer to distances between faces, and thus especially refer to the dimensions of the cavity or chamber defined by the faces and edge face.
  • the external dimensions of the lighting unit may also be selected from above values and/or ratios, especially from such ratios.
  • At least part of the total number of light sources are configured at (at least one of) the faces (including the edge face).
  • light exit unit(s) may be configured; i.e. one or both faces are light exit faces, respectively.
  • the light exit unit is configured, with at the other (opposite) face, or downstream thereof, e.g. reflective material to keep or redirect the light in(to) the waveguide.
  • the light sources are configured at a face opposite of the light exit face (with thereof the light exit unit).
  • the light sources are configured at a face opposite of the light exit face (comprising the light exit unit).
  • the light sources may especially be configured to provide light source light with optical axes perpendicular to such face and in a direction away from such face, thus especially to the light exit face.
  • the light sources are configured at the edge face, with specially the light sources configured at the edge face configured to provide the light source in a direction into the light mixing chamber facing away from the edge face.
  • the plurality of light sources are configured at the edge face and are configured to provide said light source light having an optical axis transverse to the height.
  • the lighting unit comprises at least two, even more especially at least 4, yet even more especially at least 8, yet even more especially at least 10 light sources, even more especially 16 light sources, such as especially at least 30, even more especially at least 56.
  • the number of light sources may be related to the (surface) area of a face. Especially high numbers, such as at least 10, especially at least 30, of light sources may be advantageous for a uniform distribution of light source light escaping from the light mixing chamber. Especially, a lower number of light sources may be cost efficient. In embodiments (only) 1-4 light sources are provided. The total number of light source lights may be a compromise between cost, availability, lifetime, uniformity and light output. Especially, the number of light sources may be proportional to the (surface) area of a face (of the light guide).
  • the number of light sources per m 2 area of (one of the) face(s) is selected in the range of 10-500/m 2 , especially 50-500/m 2 , such as 100-400/m 2 , even more especially in the range of 150-300/m 2 .
  • the provided light source light travels away from the light sources and may be redirected such as reflected in the light mixing chamber, especially by a face (including the edge face).
  • the redirected (reflected) light (again) may travel towards a face and be redirected (reflected) again in the light mixing chamber. Due to total multiple reflections (redirections) (inside the light mixing chamber), light may travel through the light mixing chamber until it escapes from there via an opening in the louvre.
  • a face may comprise a smooth surface to redirect light.
  • the faces, including the edge face comprises a light reflective material, such as a light reflective coating.
  • an element such as a wall element or edge providing a face or edge face may substantially consist of reflective material.
  • a reflective material is e.g. microcellular formed polyethylene terephthalate (MCPET) or microcellular foamed sheet made from polycarbonate resin (MCPOLYCA).
  • MPET microcellular formed polyethylene terephthalate
  • MCPOLYCA microcellular foamed sheet made from polycarbonate resin
  • coatings of e.g. Al 3 O 3 , MgO, BaSO 4 , etc. may be applied.
  • a face may comprise a (highly) diffuse reflective (white) layer.
  • a face may comprise a rough surface to redirect the light.
  • a face may comprise one or more structures, especially a plurality of structures, to provide a reflection in different directions.
  • the light source may be redirected (reflected) in different directions.
  • the light mixing chamber comprise other elements or structures configured to redirect the light source light.
  • the elements or structures may especially be configured at the face(s) and/or the edge face, especially (edge) faces that are not configured as light exit face. Examples of such elements are reflective elements, and may be configured as e.g. dots or stripes, and may be configured in patterns.
  • the elements for instance may have been provided by 3D printing at the faces (including the edge face) and/or during manufacturing of the light mixing box.
  • At least one of the faces comprises elements configured to redirect light source light within the light mixing chamber.
  • These elements may have the function of secondary light sources.
  • Such elements may have heights and/or widths for instance in the range of up to about 5% of the height, such as 0.01-2% of the height of the light mixing chamber.
  • the length of such elements may be in the range of the first length, but may also be in the range of up to about 5% of the height, such as 0.01-2% of the height of the light mixing chamber.
  • such elements may be configured in regular patters, irregular patters, or a pseudo random pattern.
  • the present invention there is no necessity that the (redirection) elements are aligned with the louvre cells. Hence, in embodiments the elements have a fully regular pattern or have another pattern that is not aligned with the louvre cells.
  • the louvre cells may be configured in different type of patterns. Also combinations of patterns may be used. For instance, the configuration may be cubic or hexagonal. Especially, it appears that such highly symmetric patters are perceived less desirable. Hence, in embodiments the louvre cells are configured in a pseudo random pattern. Even more especially, the beam shaping elements are configured in a phyllotaxis pattern, even more especially a phyllotaxis spiral pattern.
  • the light exit unit has a cross-sectional area having a central point, wherein the plurality of louvre cells comprised by the light exit unit only have C1 symmetry relative to the central point.
  • the domains includes louvres cells, with the domain only having C1 symmetry, but with the domains ordered in a substantially regular structure. In such embodiments, all domains may substantially be equal, with within each domain a plurality of louvre cells having mutually different cross-sections.
  • the lighting unit can be relatively thin.
  • the light mixing chamber or light guide can be relatively thin, but also the louvre cells can have small heights.
  • the louvre cells have louvre heights (h1) selected from the range of 1-100 mm, such as in the range of 1-20 mm, like 1.5-15 mm.
  • the louvre cells i.e. louvres or louvre walls
  • the thickness may be relatively small (thin). This leads to a low dead volume.
  • the total area of the cross-sectional areas of louvre cells is in the range of at least about 70%, such as especially at least about 80%, even more especially at least about 90% of the area of the face comprising the louvre cells.
  • Walls between adjoining louvre cells may include in the range of 0.1-30%, such as 0.1-20%, such as 0.2-10%, of a total surface area defined by a (virtual) plane defined by the louvre cells (this (virtual) plane may have an area substantially identical to the area of a face of a light guide of which downstream the light exit unit is configured).
  • the light exit unit especially the louvre unit, has a cross-sectional area, wherein the light exit unit comprises in the range of e.g. 0.05-10 louvre cells per cm 2 cross-sectional area (see also above).
  • the part of the light exit unit occupied by louvre walls defined by adjoining louvre cells is selected from the range of 9-17% of the cross-sectional area.
  • the louvres may have thickness selected from the range of 0.1-10 mm, especially selected from the range of 0.2-5 mm, such as selected from the range of 0.5-4 mm, like equal to or lower than 2 mm.
  • the louvre cells have equivalent diameters selected from the range of 0.2-20 mm, such as 1-15 mm.
  • the equivalent diameter for a given louvre cell is defined as being equal to the diameter of a circle having the same area as the given louvre cell.
  • area especially relates to a cross-sectional area (with the cross-section in the plane (of the respective face)). Note that in embodiments one or more, or even all louvre cells within a domain have mutually differing equivalent diameters. However, in (other) embodiments also two or more louvre cells within a domain may have substantially identical equivalent diameters.
  • the louvre walls may be substantially flat in a direction substantially perpendicular to a cross-section. However, the louvre walls may also, over at least part of their height, include a tapering.
  • the louvre cells may comprise a first louvre cell opening, for receipt of light (escaping from the light mixing chamber) and further comprising a second louvre cell opening for escape of (beam shaped light).
  • the first louvre cell opening is configured upstream of the second louvre cell opening.
  • the first louvre cell opening may be smaller than the second louvre cell opening. In this way, additional beam shaping (collimating) functionality may be added to the light exit unit.
  • the louvre cells have e.g. equivalent diameters selected from the range of 0.2-20 mm, such as 1-15 mm. The first and second equivalent diameters will especially both be selected from this range (but may thus mutually differ).
  • the second louvre cell openings may thus be configured in a 2D array, which especially provides light emitting surface.
  • the lighting unit may have a lighting unit length (L3) and a lighting unit height (H3) with a ratio of the lighting unit length (L3) to the lighting unit height (H3) of 1 ⁇ L3/H3 ⁇ 100, especially 2 ⁇ L3/H3 ⁇ 100, yet even more especially 5 ⁇ L3/H3 ⁇ 100.
  • ratios equal to or larger than 2 even more especially of at least 5 the unit can be very slim.
  • Such units may thus include likewise slim light mixing chamber, which may substantially have the same ratio of dimensions. Though the light mixing chamber and/or the lighting unit being slim, a large light emitting surface may be provided.
  • the lighting unit comprises at least 10 light sources, wherein the light sources comprise solid state light sources, wherein the louvre cells have louvre heights (h1) selected from the range of 1-100 mm, wherein the light exit unit has a cross-sectional area, wherein the light exit unit comprises in the range of 0.05-10 louvre cells per cm 2 cross-sectional area, wherein the part of the light exit unit occupied by louvre walls defined by adjoining louvre cells is selected from the range of 9-17% of the cross-sectional area.
  • the area occupied by the louvre walls in the case of non-straight walls will be the area occupied by the walls at the first louvre cell opening.
  • the louvres according to the invention may comprise reflectors.
  • the reflectors comprise a metallic (mirror) material, such as a metallic layer.
  • a surface of a reflector may be metalized, especially to create a specular reflective surface.
  • the reflector may comprise a reflecting paint.
  • the louvre cells may comprise a first louvre cell opening, for receipt of (light) source light (escaping from the light mixing chamber) and further comprising second louvre cell openings for escape of (beam shaped light), especially wherein a reflective face is configured between a first louvre cell opening and a corresponding second louvre cell opening.
  • At least part of louvre cell faces configured between said first louvre cell openings and said second louvre cell openings comprise a reflective material, especially a metallic mirror material.
  • the louvre cell walls may also comprise a polymeric material that is coated with reflective material, such as indicated above.
  • the walls of the louvre cells maybe straight or tapering.
  • the parameter "equivalent diameter” is used, which is simply taken as the average of the diameters of the first louvre cell opening and the second louvre cell opening.
  • the light mixing chamber may comprise wall elements comprising said face(s) and, edge face, such as to provide an air guide.
  • the lighting unit may also include wall elements enclosing a waveguide, with at least part of the wall elements configured as light exit unit. At least part of the lighting unit, such as a wall element comprising the louvre cells, or a separate element comprising louvre cells, etc. may be provided by one or more of 3D printing and injection molding.
  • a face comprising said plurality of louvre cells and at least part of the edge face are comprised by a single unit. An integration of two or more of the elements of the lighting unit may also useful in view of thermal management.
  • the open structure, especially in the case of an air guide, of the lighting unit may also add to thermal management.
  • the light mixing chamber such as the air guide or waveguide
  • the lighting mixing chamber may be in fluid contact with its environment.
  • natural convection may help in temperature control of the lighting unit.
  • the lighting mixing chamber assuming an air guide, further comprises one or more air openings, especially configured at one or more of the edge face and a face not facing the plurality of louvre cells. For instance, air may enter via such opening(s) and heated air may escape via the louvre cells. However, this may also be the other way around, with air entering via the louvre cells and heated air escaping via the air openings.
  • the lighting unit further comprises an air flow generating device, such as a small pump, an (air) ventilator, an air jet, a venturi, etc., configured to provide an air flow within at least part of the lighting unit, such as in or around the light mixing chamber.
  • an air flow generating device such as a small pump, an (air) ventilator, an air jet, a venturi, etc.
  • one or more of the edge face and the face comprising the plurality of louvre cells comprises a thermally conductive material.
  • at least part of the lighting device may comprise aluminum, or another thermally conductive material, such as steel, cupper, magnesium, a heat conducting plastic, etc.
  • the lighting unit may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, or LCD backlighting.
  • white light herein, is known to the person skilled in the art.
  • a solution herein proposed is to create a beam shaping element, which is e.g. in embodiments made out of a good thermal conductive material such as aluminum, which is placed on the (large) light emitting surface of the luminaire.
  • the louvre walls may be of aluminum, etc. (see also above).
  • This surface is typically facing downwards to the room when installed at the ceiling.
  • This beam shaping element may in embodiments be made such that it is in good thermal contact with the LED's, so that the heat generated by the LED's can go into the beam shaping element. Because of its relative large surface, a good heat exchange can be realized to the ambient air.
  • the element in front of the light emitting surface does not have to have a beam shaping function per se, but can also be a decorative element with straight walls so that the light may only be affected minimally.
  • Figs. 1a and 1b schematically depict in cross-sectional views, some embodiments of a lighting unit 1000 comprising a plurality of light sources 10, for - in use - generation of lighting unit light 1001. Further, the lighting unit 1000 comprises a light exit unit 200 for escape of at least part of said lighting unit light 1001 from the lighting unit 1000.
  • the light exit unit 200 comprises a louvre unit 1200 comprising a plurality of louvre cells 210 for beam shaping the lighting unit light 1001.
  • the lighting unit comprises a plurality of light sources 10 configured to provide light source light 11 in the light mixing chamber 100.
  • the light sources comprise LEDs.
  • four light sources 100 are depicted, but in general much more light sources may be available, such as at least 10, like at least 20.
  • the lighting unit 1000 may include wall elements 120, including the light exit unit 200 may define the lighting unit 1000.
  • the wall elements 120 including the light exit unit 200 may define a lighting chamber 100, such as an air guide 1120 ( Fig. 1a ).
  • the wall elements 120 and light exit unit 200 may also define a chamber enclosing a wave guide 1130 ( Fig. 1b ).
  • the wall elements 120 are here also indicated as edge wall element 123, second wall element 122, and first wall element 121.
  • the edge wall element 123 defines an edge face 130 which may be reflective.
  • Wall element 122 defines a second face 112 which may also be reflective.
  • Wall element 121 is essentially the light exit unit 200, which defines a light exit unit first face 1210. This face is in this variant also indicated as light exit face 1110.
  • the wall elements define an air guide 1120, which is here a mixing chamber 100.
  • the light exit face 1110 is comprised said light exit unit 200.
  • the light exit unit first face 1210 coincides with the first face 111 or light exit face 1110.
  • the wall elements 121,122,123 enclose a waveguide 1130.
  • the waveguide 1130 is a mixing chamber 100.
  • the mixing chamber is defined by faces 110, with a first face 111, a second face 112 and an edge face 130.
  • faces 112 and 130 may be reflective for light.
  • Face 111 may be transmissive for light.
  • First face 111 is in this variant also indicated as light exit face 1110.
  • the light exit unit 200 is configured downstream of the first face 111 of the light mixing chamber 100.
  • the light exit unit first face 1210 does not coincide with the first face 111 or light exit face 1110.
  • the light in the air guide can escape from the chamber via the openings, i.e. the louvre cells 210.
  • the light in the waveguide 1130 can escape from the first face 111 or light exit face 1110 and then escape from the lighting unit 1000 via the light exit unit 200, more especially the louvre unit 1200.
  • the walls of the louvre cells 210 are straight.
  • the louvre cells may have heights H2 and lengths L2.
  • the length L2 will vary over the cross-section, herein the parameter "equivalent diameter” is used (see also Fig. 1c ).
  • the chamber 100 has a height H and a first length L1. Further, the lighting unit 1000 has a third height H3 and a third length L3. As indicated above in relation to the first length, also applies to the third length.
  • the term "third length" may refer to one or more of a length, a width, a diameter, a transverse diameter, a conjugate diameter, etc.
  • a further length may be chosen from a width, a length, a conjugate diameter or a transverse length, respectively.
  • a diagonal is selected (especially when faces are configured such that a line connecting the center of the first face and the center of the second face is perpendicular to the major and minor axis).
  • this drawing schematically shows an embodiment wherein at least one of the faces 110 comprises elements 171 configured to redirect (light source) light within the light mixing chamber 100.
  • elements 171 are schematically depicted as triangular structures, such as tetrahedral or triangular ridges.
  • the lighting unit 1000 further comprises one or more air openings 341.
  • the air openings 341 may be configured such that escape of light via such openings is minimized.
  • the accumulated cross-sectional area of such air openings is (substantially) smaller than the accumulated cross-sectional area of the first louvre cell openings 201 (for escape of lighting unit light 1001). Air may be sucked via one or more of such air openings, but also via one or more of the louvre cells. In this way, air may flow in the chamber 100 ( Fig. 1a ), or in the lighting unit 1000) and also escape there from, which assists in thermal management.
  • FIG. 1a schematically show an embodiment further comprising an air flow generating device 300 configured to provide an air flow (within the light mixing chamber 100 in the embodiment of Fig. 1a ).
  • the air flow generation device is in (direct) fluid contact with the one or more air openings 341.
  • Reference 201 indicates the first louvre cell opening, where light can enter the louvre cell 210
  • reference 202 indicates the second louvre cell opening, from which lighting unit light may escape.
  • Fig. 1c schematically depicts a non-limiting number of possible louvre cells 210, with embodiment I showing a louvre cell 210 with straight louvres or walls 212 (along the height) and with embodiment II showing a louvre cell 210 with tapering walls 212.
  • the surface of the walls may be reflective.
  • the walls may be of aluminum or may have an aluminum coating, or other reflective material or other reflective coating, (see also above for reflective materials).
  • the walls may comprise thermally conductive material.
  • the width of the wall is indicated with W1.
  • embodiment 1 the Length L2 or equivalent diameter of the louvre cell 210 is constant over the height.
  • the equivalent diameter increases with increasing distance from the first louvre cell opening 201.
  • the walls 212 are tapering; this may assist in beam shaping the lighting unit light (beam).
  • the tapering is from the second louvre cell opening 202 in the direction to the first louvre cell opening 201, with the second louvre cell opening 202 being downstream of the first louvre cell opening having a larger cross-section than the first louvre cell opening 201.
  • Fig. 2a and 2b schematically depict in top view embodiments of the light exit unit 200 which can be used to create a lighting unit.
  • the plurality of louvre cells 210 comprises a plurality of n subsets 205 each comprising a respective plurality of m louvre cells 210, wherein the louvre cells 210 of each subset 205 are configured as domain 215 of adjoining louvre cells 210, wherein a respective plurality of k louvre cells 210 within each domain 215 have mutually differing louvre cell cross-sections 211.
  • a substantially regular pattern of domains 215 is created; the hatched louvre cells 210 indicate the pattern of domains 215.
  • a domain is also shown in more detail in Fig. 2b .
  • the tapering is visible.
  • the first equivalent diameter D1 and the second equivalent diameter D2 is depicted, but these may not be to scale.
  • the width of the louvre walls is indicated with W1. This width W1 may vary over the height, with D1 ⁇ D2.
  • the domains are ordered in a substantially regular structure.
  • all domains may substantially be equal, with within each domain a plurality of louvre cells having mutually different cross-sections.
  • all louvre cells within a domain have mutually differing cross-sections, i.e. each louvre cell cross-section differs from all cross-sections of all other louvre cells within the domain.
  • a pebble-plate like louvre is obtained, with louvre cells configured in a kind of pebble arrangement or structure.
  • k m.
  • the louvre unit 1200 comprises a 2D array of louvre cells, the louvre cells are formed as irregular polygons, each domain comprising at least three polygons having a different number of louvre walls 212, i.e. 5-sided, 6-sided and 7-sided polygons.
  • the louvre walls 212 form a closed loop 213.
  • the louvre cells are agglomerated, forming in the schematically depicted embodiments agglomerates of substantially identical domains.
  • the term 2D array does thus not necessarily refer to a regular array. In contrast, it may (also) refer to an array of louvre cells that form an irregular pattern (of the domain).
  • the second louvre cell openings may thus be configured in a 2D array, which especially provides a light emitting surface during use of the lighting unit.
  • substantially herein, such as in “substantially all light” or in “substantially consists”, will be understood by the person skilled in the art.
  • the term “substantially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially may also be removed.
  • the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term “comprise” includes also embodiments wherein the term “comprises” means “consists of'.
  • the term “and/or” especially relates to one or more of the items mentioned before and after "and/or”.
  • a phrase “item 1 and/or item 2" and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to “consisting of” but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • the invention further applies to a device comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

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Claims (15)

  1. Gittereinheit (1200), umfassend eine Vielzahl von Gitterzellen (210) für Strahlformungslicht (1001) aus einer Beleuchtungseinheit (1000), wobei die Vielzahl von Gitterzellen (210) eine Vielzahl von n Teilmengen (205) umfasst, die jeweils eine jeweilige Vielzahl von m Gitterzellen (210) umfassen,
    wobei die Gitterzellen (210) jeder Teilmenge (205) als Bereich (215) von benachbarten Gitterzellen (210) ausgestaltet sind, wobei eine jeweilige Vielzahl von k Gitterzellen (210) innerhalb jedes Bereichs (215) gegenseitig abweichende Gitterzellen-Querschnitte (211) aufweisen, wobei 3 ≤ n ≤ 100000, wobei 5 ≤ m ≤ 21 und wobei 5 ≤ k ≤ m,
    wobei die Gitterzellen als Vielecke gebildet sind, die von einer Anzahl Ne von Gitterwänden (212) begrenzt sind, die sich in einem Ring (213) schließen, wobei für jede Gitterzelle die Anzahl Ne in der Spanne von 3 ≤ Ne ≤ 10 liegt,
    dadurch gekennzeichnet, dass
    die Vielzahl von Gitterzellen (210) innerhalb des gleichen Bereichs nur eine Cl-Symmetrie in Bezug auf den Mittelpunkt (P) in dem Bereich aufweisen und jeder Bereich mindestens drei Vielecke inkongruenter Form umfasst, und
    wobei jede Gitterzelle einen jeweiligen gleichen Querschnitt aufweist, das gegenseitige Verhältnis zwischen gleichen Querschnitten von Gitterzellen in der Spanne von 1:2,5 liegt.
  2. Beleuchtungseinheit (1000), umfassend (i) eine Vielzahl von LED-Lichtquellen (10) zur Erzeugung von Beleuchtungseinheitslicht (1001) und (ii) eine Lichtaustrittseinheit (200) zum Entweichen von mindestens einem Teil des Beleuchtungseinheitslichts (1001) aus der Beleuchtungseinheit (1000), wobei die Lichtaustrittseinheit (200) eine Gittereinheit (1200) nach Anspruch 1 umfasst, wobei die Gittereinheit in einer ersten Lichtaustrittsfläche (1210) angeordnet ist.
  3. Beleuchtungseinheit (1000) nach Anspruch 2, wobei die Bereiche (215) gegenseitig identisch und in der ersten Lichtaustrittsfläche (1210) regelmäßig angeordnet sind.
  4. Beleuchtungseinheit (1000) nach Anspruch 2 oder 3, umfassend eine Lichtmischkammer (100), wobei die Vielzahl von Lichtquellen (10) ausgestaltet ist, Lichtquellenlicht (11) in der Lichtmischkammer (100) zum Bereitstellen des Beleuchtungseinheitslichts (1001) bereitzustellen, wobei die Lichtmischkammer (100) als die erste Lichtaustrittsfläche (1210) eine Lichtaustrittsfläche (1110) zum Entweichen von Lichtquellenlicht (11) aus der Lichtmischkammer (100) umfasst, wobei die Lichtaustrittsfläche (1110) in der Lichtaustrittseinheit (200) enthalten ist oder wobei die Lichtaustrittseinheit (200) stromabwärts von der Lichtaustrittsfläche (1110) ausgestaltet ist.
  5. Beleuchtungseinheit (1000) nach Anspruch 4, wobei eine Luftführung (1120) als die Lichtmischkammer (100) ausgestaltet ist und wobei die Lichtaustrittsfläche (1110) in der Lichtaustrittseinheit (200) enthalten ist.
  6. Beleuchtungseinheit (1000) nach Anspruch 4, wobei ein Wellenleiter (1130) als die Lichtmischkammer (100) ausgestaltet ist, wobei der Wellenleiter (1130) die Lichtaustrittsfläche (1110) umfasst und wobei die Lichtaustrittseinheit (200) stromabwärts von der Lichtaustrittsfläche (1110) ausgestaltet ist.
  7. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 4-6, wobei die Lichtmischkammer (100) eine oder mehrere Flächen (110) und eine Randfläche (130) umfasst, wobei die Lichtmischkammer (100) eine Höhe (H) aufweist, die kleiner ist als eine erste Länge (L1) der Lichtmischkammer (100).
  8. Beleuchtungseinheit (1000) nach Anspruch 7, wobei die Lichtmischkammer (100) ein Verhältnis der ersten Länge (L1) zu der Höhe (H) von 5 ≤ L1/H ≤ 100 aufweist.
  9. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 7-8, wobei die Vielzahl von Lichtquellen (10) an der Randfläche (130) ausgestaltet ist und ausgestaltet ist, das Lichtquellenlicht (11) bereitzustellen, das eine optische Achse (O) quer zu der Höhe (H) aufweist.
  10. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 7-9, wobei mindestens eine der einen oder mehreren Flächen (110) Elemente (171) umfasst, die ausgestaltet sind, Lichtquellenlicht (11) innerhalb der Lichtmischkammer (100) umzuleiten.
  11. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 2-10, wobei die Gitterzellen (210) in einem pseudozufälligen Muster oder in einem Phyllotaxis-Muster ausgestaltet sind.
  12. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 2-11, wobei sich die Gitterzellen von einer zweiten Gitterzellenöffnung (202) in Richtung einer ersten Gitterzellenöffnung (201) verjüngen, wobei die erste und zweite Gitterzellenöffnung ein Verhältnis R12 in der Spanne von 0,5-1,1 aufweisen und R12 ≠ 1 ist.
  13. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 2-12, wobei die Beleuchtungseinheit (1000) mindestens 10 Lichtquellen (10) umfasst, wobei die Lichtquellen (10) Festkörper-Lichtquellen umfassen, wobei die Gitterzellen (210) Gitterhöhen (h1) aufweisen, die aus der Spanne von 1-100 mm ausgewählt werden, wobei die Lichtaustrittseinheit (200) eine Querschnittsfläche (1211) aufweist, wobei die Lichtaustrittseinheit (200) in der Spanne von 0,05-10 Gitterzellen (210) pro cm2 Querschnittsfläche (1211) umfasst, wobei der Teil der Lichtaustrittseinheit (200), der von den Gitterwänden (212) besetzt ist, die durch benachbarte Gitterzellen (210) definiert sind, ausgewählt wird aus der Spanne von 9-17% der Querschnittsfläche (1211).
  14. Beleuchtungseinheit (1000) nach einem der vorstehenden Ansprüche 2-13, die eine Beleuchtungseinheitslänge (L3) und eine Beleuchtungseinheitshöhe (H3) mit einem Verhältnis der Beleuchtungseinheitslänge (L3) zu der Beleuchtungseinheitshöhe (H3) von 5 ≤ L3/H3 ≤ 100 aufweist.
  15. Beleuchtungseinheit nach einem der vorstehenden Ansprüche 2-14, wobei die Gitterzellen eine Höhe H2 und einen äquivalenten Durchmesser L2 aufweisen, wobei ein Verhältnis von H2/L2 ≥ 0,5 ist, vorzugsweise ≥ 0,8, besonders bevorzugt ≥ 1,2, z. B. H2/L2 = 1.
EP17717432.3A 2016-04-22 2017-04-13 Kieselsteinplattenähnliches gitterabdeckung Active EP3446030B1 (de)

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PCT/EP2017/058996 WO2017182392A1 (en) 2016-04-22 2017-04-13 Pebble-plate like louvre

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EP3446030A1 (de) 2019-02-27
WO2017182392A1 (en) 2017-10-26

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