EP3286494B1 - Dispositif permettant de modifier la répartition lumineuse - Google Patents

Dispositif permettant de modifier la répartition lumineuse Download PDF

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Publication number
EP3286494B1
EP3286494B1 EP16721850.2A EP16721850A EP3286494B1 EP 3286494 B1 EP3286494 B1 EP 3286494B1 EP 16721850 A EP16721850 A EP 16721850A EP 3286494 B1 EP3286494 B1 EP 3286494B1
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EP
European Patent Office
Prior art keywords
geometric
light
shape
reflector
longitudinal direction
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EP16721850.2A
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German (de)
English (en)
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EP3286494A1 (fr
Inventor
Hannu Hukkanen
Tero MÄKINEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ledil Oy
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Ledil Oy
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/048—Optical design with facets structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/10—Construction
    • F21V7/16—Construction with provision for adjusting the curvature

Definitions

  • the invention relates generally to illuminating engineering. More particularly, the invention relates to a device for modifying distribution of light produced by a light source that can be, for example but not necessarily, a light emitting diode "LED".
  • a light source that can be, for example but not necessarily, a light emitting diode "LED”.
  • FIG. 1a shows a section view of an exemplifying device 101 according to the prior art for modifying the distribution of light produced by a light source 102.
  • the section shown in figure 1a is taken along a line A-A shown in figure 1b and the section plane is parallel with the yz-plane of a coordinate system 199.
  • the device 101 for modifying the light distribution comprises a reflector surface 110 whose cross-sections along geometric planes parallel with the xz-plane of the coordinate system 199 are circular.
  • Figure 1a some of the light beams produced by the light source 102 are depicted with dashed line arrows.
  • Figure 1c illustrates an illumination pattern 105 formed on a planar surface 104 by the light distribution modified by the device 101.
  • the non-illuminated area is depicted with cross-hatching.
  • the shape of the reflector surface 110 determines at least partly the intensity distribution within the illumination pattern 105.
  • one of the level curves of the intensity distribution is denoted with a reference number 106.
  • An edge 103 of the reflector surface 110 determines the shape of the illumination pattern 105 so that geometric straight lines drawn from the light source 102 via the edge 103 to the planar surface 104 define a border 107 of the illumination pattern.
  • Figures 2a, 2b, and 2c illustrate an illumination arrangement that is otherwise similar to the illumination arrangement illustrated in figures 1a-1c but a device 201 for modifying the light distribution comprises a reflector surface 210 whose cross-sections along geometric planes parallel with the xz-plane of a coordinate system 299 are square shaped.
  • Figure 2c illustrates an illumination pattern 205 formed on a planar surface 204 by the light distribution modified by the device 201. In figure 2c , the non-illuminated area is depicted with cross-hatching.
  • the shape of the reflector surface 210 determines at least partly the intensity distribution within the illumination pattern 205.
  • one of the level curves of the intensity distribution is denoted with a reference number 206.
  • An edge 203 of the reflector surface 210 determines the shape of the illumination pattern 205 so that geometric straight lines drawn from the light source 202 via the edge 203 to the planar surface 204 define a border 207 of the illumination pattern.
  • the shape of the reflector surface determines the shape of the illumination pattern and at least partly the intensity distribution within the illumination pattern. Therefore, the shape of the illumination pattern and the intensity distribution are related to each other at least in some extent. In many cases there is, however, a need to produce an illumination pattern so that the shape of the illumination pattern and the intensity distribution can be designed more freely with respect to each other.
  • the word "geometric" when used as a prefix means a geometric concept that is not necessarily a part of any physical object.
  • the geometric concept can be for example a geometric line, a geometric plane, a non-planar geometric surface, a geometric room, or any other geometric entity that is one, two, or three dimensional.
  • a device for modifying the distribution of light produced by a light source.
  • a device comprises:
  • the reflector surface is capable of determining at least partly the intensity distribution within an illumination pattern formable on a planar surface by the light distribution modified by the device, and the edge of the reflector surface is capable of determining the shape of the illumination pattern by determining the border of the illumination pattern.
  • the shape of at least a part of the reflector surface is a result of a shape transformation directed to a geometric auxiliary surface constituting a geometric channel between the first and second ends.
  • the shape transformation comprises: i) division of the geometric auxiliary surface into longitudinal geometric surface segments with geometric section lines directed from the first end to the second end, ii) displacements of at least some of the geometric surface segments substantially sideward with respect to the longitudinal direction so as to obtain a desired shape, and iii) addition of geometric connection-surfaces between ones of the geometric surface segments at least partly separated from each other by the displacements so as to form a stepped geometric surface representing the shape of the at least part of the reflector surface, wherein the geometric auxiliary surface and geometric planes perpendicular to the longitudinal direction intersect along closed section curves free from corners.
  • a displacement of a geometric surface segment can be a shape-conserving displacement in which case all points of the geometric surface segment under consideration are displaced with a same displacement vector. It is also possible that the displacement is not shape-conserving so that different points of the geometric surface segment are displaced with different displacement vectors. In this case, the geometric surface segment under consideration can be warped, stretched, or otherwise deformed.
  • the above-mentioned geometric auxiliary surface is merely a geometric concept used for describing the shape of the reflector surface and the geometric auxiliary surface is not necessarily a surface of any physical object.
  • the shape of the geometric auxiliary surface can be selected according to the desired intensity distribution within the illumination pattern formable on the planar surface, whereas the shape produced by the shape transformation can be selected according to the desired shape of the illumination pattern.
  • the geometric auxiliary surface can have for example a smooth shape so that the geometric auxiliary surface and geometric planes perpendicular to the longitudinal direction of the device intersect along closed section curves free from corners.
  • the geometric auxiliary surface can be for example a part of a geometric paraboloid, e.g. a geometric rotation paraboloid.
  • the above-mentioned edge of the reflector surface may have a shape that approximates for example a polygon when the edge is seen along the longitudinal direction of the device.
  • the shape of the illumination pattern on the planar surface is substantially a polygon.
  • the polygon can be for example a square, a triangle, or a rectangle.
  • a new illuminator system comprising at least one light source and at least one device according to the invention for modifying the distribution of light produced by each light source.
  • the light source can be, for example, a light emitting diode "LED", a filament lamp, or a gas-discharge lamp.
  • a new mold having a form suitable for manufacturing, by mold casting, a piece of solid material, e.g. plastic, having a shape of a device according to the invention.
  • a process of manufacture of a device according to an exemplifying and non-limiting embodiment of the invention may further comprise coating one or more areas of the above-mentioned piece of solid material with metal or other material so as to obtain desired optical properties.
  • Figure 3a shows a front view of a device 301 according to an exemplifying and non-limiting embodiment of the invention for modifying the distribution of light produced by a light source 302.
  • the light source can be for example a light emitting diode "LED", a filament lamp, or a gas-discharge lamp.
  • Figure 3b shows a perspective view of the device 301.
  • the device 301 comprises a first end 308 that comprises a place for the light source 302 and a second end 309 for allowing the light to exit from the device.
  • the second end 309 is a distance away from the first end 308 in the longitudinal direction of the device.
  • the longitudinal direction is parallel with the y-direction of the coordinate system 399.
  • the device 301 comprises a reflector surface 310 that constitutes a light propagation channel between the first and second ends 308 and 309 as illustrated by the perspective view shown in figure 3b .
  • the reflector surface 310 has an edge 311 at the first end 308 of the device and an edge 312 at the second end 309 of the device.
  • one of the light beams radiated by the light source 302 is depicted with a dash-and-dot line arrow.
  • Figure 3c illustrates an illumination pattern 305 formed on a planar surface 304 by the light distribution modified by the device 301 in an exemplifying situation in which the planar surface 304 is in front of the device 301 and parallel with the xz-plane of the coordinate system 399.
  • the non-illuminated area is depicted with cross-hatching.
  • the shape of the reflector surface 310 determines at least partly the intensity distribution within the illumination pattern 305.
  • one of the level curves of the intensity distribution is denoted with a reference number 306.
  • the edge 312 of the reflector surface 310 determines the shape of the illumination pattern 305 so that geometric straight lines drawn from the light source 302 via the edge 312 to the planar surface 304 define a border 307 of the illumination pattern.
  • the light source 302 and the edge 312 are shown in figures 3a and 3b .
  • the edge 312 of the reflector surface 310 has a shape approximating a square and therefore the shape of the illumination pattern 305 on the planar surface 304 is substantially a square.
  • the shape of the whole reflector surface 310 is a result of a shape transformation directed to a geometric auxiliary surface that constitutes a geometric channel between the first and second ends 308 and 309 of the device 301.
  • a part of the geometric auxiliary surface is denoted with a reference number 330.
  • the geometric auxiliary surface is rotationally symmetric so that the geometric auxiliary surface and geometric planes perpendicular to the z-direction of the coordinate system 399 intersect along circular section curves.
  • some of the circular section curves are depicted with dashed line circles and one of the dashed line circles is denoted with a reference number 317.
  • the geometric auxiliary surface can be for example a part of a geometric paraboloid. Because of the rotational symmetry of the geometric auxiliary surface, the level curves of the intensity distribution are round as illustrated in figure 3c . It is to be noted that figure 3c is merely a schematic illustration and in a real case the level curves of the intensity distribution are not necessarily as circular as in figure 3c but the level curves of the intensity distribution are however closer to circles than in the case illustrated in figures 2a-2c .
  • the above-mentioned shape transformation is described below with reference to figure 3b .
  • the shape transformation comprises division of the geometric auxiliary surface into longitudinal geometric surface segments with geometric section lines directed from the first end 308 to the second end 309. Three of the geometric surface segments of the geometric auxiliary surface are denoted with reference numbers 313, 314' and 315'.
  • the shape transformation further comprises displacements of some of the geometric surface segments substantially sideward with respect to the longitudinal direction of the device 301 so as to achieve a desired shape. The displacements are depicted with dashed line arrows.
  • the geometric surface segments 314' and 315' after the displacements are depicted with reference numbers 314 and 315.
  • the geometric surface segment 313 is one of the geometric surface segments of the geometric auxiliary surface that are not displaced and thus, concerning the geometric surface segment 313, the reflector surface 310 concurs with the geometric auxiliary surface.
  • the shape transformation further comprises addition of geometric connection-surfaces between those of the geometric surface segments that are at least partly separated from each other by the displacements so as to form a stepped geometric surface representing the shape of the reflector surface 310.
  • One of the geometric connection-surfaces is denoted with a reference number 316.
  • the geometric surface segments of the geometric auxiliary surface are displaced so that the shapes of the geometric surface segments are substantially unchanged, i.e. all points of each geometric surface segment are displaced with a substantially same displacement vector. It is, however, also possible that all points of each geometric surface segment are not displaced with a substantially same displacement vector.
  • the shape transformation applied on the case illustrated in figures 3a and 3b could be as well for example such that the ends of the geometric surface segments that are at the first end 308 of the device are not moved at all, the ends of the geometric surface segments that are at the second end 309 of the device are moved as illustrated in figure 3b , and points of the geometric surface segments between the ends of the geometric surface segments are moved so that each geometric surface segment gets or retains a desired shape e.g. the shape of a part of a geometric paraboloid.
  • the shape of the edge of the reflector surface at the first end 308 of the device would be circular when seen along the longitudinal direction of the device, i.e. along the y-direction of the coordinate system 399.
  • the shape of the edge 312 of the reflector surface 310 can be selected according to the desired illumination pattern obtainable with the aid of the device 301.
  • the above-described shape transformation can be used for obtaining other shapes too.
  • a shape obtained with the above-described shape transformation can be for example a shape that approximates a polygon other than a square, e.g. a triangle, a non-square rectangle, a pentagon, a hexagon, a heptagon, an octagon, a parallelogram, a trapezium, etc.
  • the polygon does not necessarily need to be convex so that all the angles are below 180 degrees but it is also possible to produce a shape that approximates a polygon having one or more concave angles each being greater than 180 degrees.
  • An example of a polygon having concave angles is a star-shaped polygon.
  • the shape of the edge 311 shown in figures 3a and 3b approximates a polygon having eight angles so that four of the angles are each less than 90 degrees and the rest of the angles are each greater than 180 degrees.
  • the above-described shape transformation can be used for obtaining forms having one or more curved outlines.
  • the geometric surface segments of the geometric auxiliary surface are mutually similar. In order to approximate for example a square or another polygon more accurately, the geometric surface segments corresponding to the corner regions of the polygon can be made narrower than the geometric surface segments corresponding to the middle regions of the sides of the polygon.
  • FIG. 4 illustrates a device 401 according to an exemplifying and non-limiting embodiment of the invention for modifying light distribution.
  • the device 401 comprises a first end 408 comprising a place for a light source and a second end 409 for allowing light to exit from the device.
  • the device 401 comprises a reflector surface 410 constituting a light propagation channel between the first and second ends 408 and 409.
  • the reflector surface 410 has an edge 411 at the first end 408 and an edge 412 at the second end 409.
  • the reflector surface 410 comprises annular sections 418, 419, 420, and 421 that are successive in the longitudinal direction of the device 401.
  • each transition region between adjacent ones of the annular sections 418-421 forms a step-wise broadening of the light propagation channel constituted by the reflector surface.
  • the shapes of the annular sections 419, 420, and 421 are results of shape transformations of the kind described above with reference to figure 3b .
  • the shape of the annular section 418 that is closest to the first end 408 has a shape that is smooth in the circumferential direction of the annular section 418.
  • the shape of the annular section 418 may correspond for example to a shape of a geometric paraboloid, e.g. a rotational geometric paraboloid.
  • Figures 5a and 5b illustrate a device 501 according to an exemplifying and non-limiting embodiment of the invention for modifying light distribution.
  • the device 501 is more asymmetric than the devices 301 and 401 illustrated in figures 3a , 3b , and 4 .
  • the device 501 comprises a first end 508 comprising a place for a light source and a second end 509 for allowing light to exit from the device.
  • the device 501 comprises a reflector surface 510 constituting a light propagation channel between the first and second ends 508 and 509.
  • the reflector surface 510 has an edge 511 at the first end 508 and an edge 512 at the second end 509.
  • the reflector surface 510 comprises annular sections 518, 519, 520, and 521 that are successive in the longitudinal direction of the device, i.e. in the direction from the first end 503 to the second end 509. As illustrated in figure 5 , each transition region between adjacent ones of the annular sections 518-521 forms a step-wise broadening of the light propagation channel constituted by the reflector surface 510.
  • the shapes of the annular sections 519, 520, and 521 are results of shape transformations of the kind described above with reference to figure 3b .
  • the shape of the geometric auxiliary surface used as a starting point of the shape transformation relating to the annular section 521 is illustrated with a closed dashed line curve.
  • One of the displacements related to the shape transformation is depicted with a dashed line arrow in figure 5a .
  • the shape of the annular section 518 that is closest to the first end 508 has a shape that is smooth in the circumferential direction of the annular section 518.
  • edge 512 of the reflective surface 510 does not necessarily need to concur with a geometric plane. Instead, for example, the edge 512 can be arranged to concur with a non-planar geometric surface that, in turn, concurs with dash-and-dot lines 525 shown in figure 5b .
  • each of the devices for modifying light distribution comprises a structure constituting a cavity whose surface is the reflector surface.
  • the structure constituting the cavity may comprise a body-part made of for example plastic and a metal coating or another suitable coating for providing the reflectiveness of the reflector surface.
  • the device comprises a piece of transparent material that has an outer surface constituting the reflector surface so that the outer surface reflects light arriving from inside the piece of the transparent material.
  • the outer surface provides total internal reflection "TIR" based on the sufficiently high refractive index of the transparent material.
  • the transparent material can be for example plastic, glass, or optical silicone.
  • one or more of the reflector surface areas between the steps can be partly or wholly provided with roughness and/or undulations so as to achieve scattering reflections but it is also possible that the reflective areas are smooth so as to provide mirroring reflections.
  • the undulations may comprise grooves and/or other deviations from a smooth shape.
  • the roughness and/or undulation can be used for achieving e.g. a color mixing effect so that light beams exhibiting different wavelengths become effectively mixed and evenly distributed.
  • a light penetrating surface of a light source is provided with roughness and/or undulations so as to achieve the mixing effect.
  • the light source is covered with a dome made of material penetrable by light and provided with roughness and/or undulations so as to achieve the mixing effect.
  • FIG. 6 illustrates an illuminator system according to an exemplifying and non-limiting embodiment of the invention.
  • the illuminator system comprises light sources 602a, 602b, 602c, and 602d and devices 601a, 601 b, 601c, and 601d according to an embodiment of the invention for modifying the distribution of the light emitted by the light sources.
  • Each of the light sources 602a-602d can be for example a light emitting diode "LED".
  • the front side of the illuminator system is substantially covered by the reflective surfaces of the devices 601a-601d. Therefore, darker regions, i.e. regions between the reflective surfaces, are smaller than for example in a case where the reflective surfaces are rotationally symmetric.

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

Claims (11)

  1. Dispositif (301, 401, 501, 601a-601d) pour modifier une répartition lumineuse, le dispositif comprenant :
    - une première extrémité (308, 408) comprenant une place pour une source lumineuse,
    - une deuxième extrémité (309, 409) pour permettre à de la lumière de sortir du dispositif, la deuxième extrémité étant éloignée d'une distance par rapport à la première extrémité dans une direction longitudinale du dispositif, et
    - une surface de réflecteur (310, 410) constituant un canal de propagation de lumière entre les première et deuxième extrémités et ayant un bord (312) délimitant une zone de sortie géométrique pour permettre à la lumière de sortir du canal de propagation de lumière,
    dans lequel la surface de réflecteur est capable de déterminer au moins partiellement une répartition d'intensité dans un diagramme d'illumination pouvant être formé sur une surface plane par la répartition lumineuse modifiée par le dispositif, et le bord de la surface de réflecteur est capable de déterminer une forme du diagramme d'illumination en déterminant une bordure du diagramme d'illumination,
    caractérisé en ce qu'une forme d'au moins une partie de la surface de réflecteur est un résultat d'une transformation de forme menant à une surface auxiliaire géométrique constituant un canal géométrique entre les première et deuxième extrémités, la transformation de forme comprenant : i) la division de la surface auxiliaire géométrique en segments de surface géométrique longitudinaux (314', 315') avec des lignes de section géométriques dirigées de la première extrémité vers la deuxième extrémité, ii) des déplacements d'au moins certains des segments de surface géométrique (314', 315') sensiblement latéralement par rapport la direction longitudinale, et iii) l'ajout de surfaces de connexion géométriques (316) entre des segments des segments de surface géométrique (314, 315) au moins partiellement séparés les uns des autres par les déplacements, de manière à former une surface géométrique étagée représentant la forme d'au moins une partie de la surface de réflecteur, dans lequel la surface auxiliaire géométrique et des plans géométriques perpendiculaires à la direction longitudinale se croisent le long de courbes de section fermées exemptes d'angles.
  2. Dispositif selon la revendication 1, dans lequel la surface auxiliaire géométrique est une partie d'un paraboloïde géométrique.
  3. Dispositif selon la revendication 1 ou 2, dans lequel le bord (312) de la surface de réflecteur a une forme se rapprochant d'un polygone en vue le long de la direction longitudinale.
  4. Dispositif selon la revendication 3, dans lequel le polygone est l'un parmi les suivants : un triangle, un carré, un rectangle, un pentagone, un hexagone, un heptagone, un octogone, un parallélogramme, un trapèze.
  5. Dispositif selon la revendication 3 ou 4, dans lequel les segments de surface géométrique de la surface auxiliaire géométrique correspondant à des zones d'angle du polygone sont plus étroits dans une direction circonférentielle perpendiculaire à la direction longitudinale que les segments de surface géométrique de la surface auxiliaire géométrique correspondant à des zones médianes de côtés du polygone.
  6. Dispositif selon l'une quelconque des revendications 1-5, dans lequel la surface de réflecteur comprend des sections annulaires (418-421) successives dans la direction longitudinale, et chaque zone de transition entre des sections adjacentes des sections annulaires forme un élargissement étagé du canal de propagation de lumière constitué par la surface de réflecteur.
  7. Dispositif selon la revendication 6, dans lequel une section particulière des sections annulaires (418), laquelle est la plus proche de la première extrémité (408), et des plans géométriques perpendiculaires à la direction longitudinale se croisent le long de courbes de section fermées exemptes d'angles.
  8. Dispositif selon l'une quelconque des revendications 1-7, dans lequel le dispositif comprend une structure constituant une cavité dont la surface constitue la surface de réflecteur.
  9. Dispositif selon l'une quelconque des revendications 1-7, dans lequel le dispositif comprend un morceau de matériau transparent ayant une surface extérieure constituant la surface de réflecteur, la surface extérieure étant capable de réfléchir de la lumière arrivant au niveau de la surface extérieure depuis l'intérieur du morceau de matériau transparent.
  10. Système d'éclairage comprenant :
    - au moins un dispositif (601a-601d) selon l'une quelconque des revendications 1-9 pour modifier une répartition lumineuse, et
    - au moins une source lumineuse (602a-602d) mise en place sur l'au moins un dispositif et étudiée pour produire de la lumière.
  11. Moule ayant une forme qui convient pour la fabrication, par coulée de moulage, d'un morceau de matériau solide ayant une forme d'un dispositif selon l'une quelconque des revendications 1-9.
EP16721850.2A 2015-04-24 2016-04-22 Dispositif permettant de modifier la répartition lumineuse Active EP3286494B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15165078.5A EP3086026A1 (fr) 2015-04-24 2015-04-24 Dispositif permettant de modifier la répartition lumineuse
PCT/FI2016/050266 WO2016170234A1 (fr) 2015-04-24 2016-04-22 Dispositif pour modifier la distribution de lumière

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Publication Number Publication Date
EP3286494A1 EP3286494A1 (fr) 2018-02-28
EP3286494B1 true EP3286494B1 (fr) 2019-11-20

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EP15165078.5A Withdrawn EP3086026A1 (fr) 2015-04-24 2015-04-24 Dispositif permettant de modifier la répartition lumineuse
EP16721850.2A Active EP3286494B1 (fr) 2015-04-24 2016-04-22 Dispositif permettant de modifier la répartition lumineuse

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PL71003Y1 (pl) * 2017-10-24 2019-09-30 Lena Lighting Spolka Akcyjna Lampa LED, wielodiodowa
WO2019149555A1 (fr) * 2018-02-01 2019-08-08 Signify Holding B.V. Dispositif d'éclairage polarisé contenant un réflecteur préservant la polarisation

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DE102007035396B4 (de) * 2007-07-26 2011-04-14 Erco Gmbh Leuchte
TWM334262U (en) * 2007-10-12 2008-06-11 Dosun Solar Technology Co Ltd Light-emitting diode (LED) lighting fixture having light beam adjustment
CN202302885U (zh) * 2011-05-04 2012-07-04 广东德豪润达电气股份有限公司 一种带有反光杯的led光源装置
US8449159B2 (en) * 2011-10-18 2013-05-28 Lawrence M. Rice Combination optics light emitting diode landing light
US8944660B2 (en) * 2013-01-23 2015-02-03 Ledil Oy Light guide

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WO2016170234A1 (fr) 2016-10-27
EP3286494A1 (fr) 2018-02-28
EP3086026A1 (fr) 2016-10-26
HK1250775A1 (zh) 2019-01-11

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