EP2587132B1 - Réflecteur pour sources lumineuses semi-conductrices - Google Patents

Réflecteur pour sources lumineuses semi-conductrices Download PDF

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Publication number
EP2587132B1
EP2587132B1 EP12189928.0A EP12189928A EP2587132B1 EP 2587132 B1 EP2587132 B1 EP 2587132B1 EP 12189928 A EP12189928 A EP 12189928A EP 2587132 B1 EP2587132 B1 EP 2587132B1
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EP
European Patent Office
Prior art keywords
reflector
curvature
light source
facets
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP12189928.0A
Other languages
German (de)
English (en)
Other versions
EP2587132A2 (fr
EP2587132A3 (fr
Inventor
Horst Rudolph
Heinrich Dudel
Uli Langen
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.)
Trilux GmbH and Co KG
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Trilux GmbH and Co KG
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Publication of EP2587132A3 publication Critical patent/EP2587132A3/fr
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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
    • 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 reflector for semiconductor light sources, in particular for a downlight, according to the preamble of claim 1.
  • Generic reflectors are conventionally used in modules for semiconductor light sources, in particular for illuminants such as downlight emitters, in order to increase the quality of the light emitted by corresponding light sources.
  • a light source for example, LED modules or high-pressure discharge lamps are used.
  • the light emitted by semiconductor light sources has to be processed so that illumination that is pleasant for the user can be generated by the light sources in which the semiconductor light sources are used.
  • both the light color and the luminance distribution in semiconductor light sources are usually inhomogeneous over the aperture angle of the light beam emitted by the light source.
  • a light mixing of the emitted light from the semiconductor light source must be done so that a homogeneous light beam is generated with which a pleasant lighting can be achieved. It is usually desirable that a bundled beam is emitted from the illuminant for illumination, with a beam depending on the field of application a certain width can be advantageous.
  • a conventional measure to achieve a light mixing of the light emitted by a semiconductor light source in a light source and thus to produce a homogeneous beam is that on the semiconductor light source, an optical medium, such as a light-diffusing or microfacetted hemisphere is placed. Also, scattering disks are partially arranged in the vicinity of the semiconductor light source in order to achieve such a light mixing in the lighting means.
  • all of these measures have the disadvantage that high efficiency losses occur through additional absorption in the corresponding optical media to ensure the light scattering or light mixing.
  • reflectors are used in conventional bulbs with semiconductor light sources, with which a light mixing is to be achieved.
  • Such reflectors conventionally have an inner space bounded by a reflector wall, within which a light source point is provided, on which a center of an emitting surface of one or more light sources can be arranged in the reflector.
  • the reflector has a longitudinal direction and a transverse direction, wherein the light source point is arranged in the inner space such that the reflector wall circumferentially surrounds the light source point in the transverse direction.
  • the reflector has a light exit side, on which the interior is open and thus no reflector wall is arranged.
  • the reflector wall has a recess through which a light source arranged in the reflector can be electrically contacted and fixed.
  • the light mixing takes place in conventional reflectors, characterized in that facets are arranged on the inside of the reflector wall facing the interior, which have a have reflective and curved in the longitudinal direction and / or in the transverse direction surface.
  • facets are arranged on the inside of the reflector wall facing the interior, which have a have reflective and curved in the longitudinal direction and / or in the transverse direction surface.
  • metal or metallized plastic is used in the production of the facets.
  • the facets are designed, for example, in the manner of spherical sections, so that they have a circular section as a cross section.
  • the cross-section of the facets may, for example, also have the shape of a polygon.
  • the essential characteristic of the facets used in conventional reflectors is that the facets have mutually inclined surface sections, so that a scattering of the incident light on the facet surface, in particular an expansion of the light beam, which occurs on the facet surface is ensured.
  • a radius of curvature can thus be assigned: the radius of curvature, for example, corresponds to the radius of the corresponding circle in the case of facets with a circular segment-shaped cross-section, and in the case of facets with a polygonal or polygon-segment-shaped cross-section to the radius of the circle enveloping the polygon.
  • the invention has the object to provide a reflector for semiconductor light sources, by which the problems described above in conventional reflectors are at least partially resolved.
  • the invention proposes a reflector for semiconductor light sources with the features of claim 1.
  • the radius of curvature of the facets associated with the curvature in the longitudinal direction of the reflector varies, averaged over all facets, whose Surface center point has the same distance from the light source point, depending on this facet spacing.
  • the curvature can also go to 0, whereby the radius of curvature can also strive towards infinity.
  • the light rays From the emitting surface of the light source, the light rays at least partially reach the surfaces of the facets of the reflector wall.
  • the angle ⁇ which a light beam, which comes from the emitting surface of the light source to a facet, forms with the longitudinal axis of the reflector, in each case depends on the facet spacing. Furthermore, this angle ⁇ , especially for reflectors with non-rotationally symmetrical cross-section, also of the longitudinal distance of the facet, d. H. depending on the distance in the longitudinal direction of the facet to the emitting surface of the light source.
  • the incident on the facet surface light beam is then reflected by the facet surface, wherein the angle ⁇ , the reflected light beam with the
  • the longitudinal axis of the reflector forms, depends on the angle ⁇ and the inclination of the facet surface to the longitudinal axis of the reflector at the point where the light beam on the facet surface and is reflected by it depends.
  • the angle ⁇ which the light beam reflected by the facet forms with the longitudinal axis of the reflector is highly dependent on the longitudinal position on the facet surface in which the light rays strike the facet surface.
  • Two light beams which strike the facet surface with a small radius of curvature at approximately the same angle ⁇ to the longitudinal axis of the reflector and impinge on the facet surface in the longitudinal direction are thus reflected at significantly different angles ⁇ from the facet surface.
  • the radius of curvature can be chosen to be positive or negative, the facet thus convex or concave, and the radius of curvature can be changed in its amount.
  • This also includes a completely flat facet surface as the limit of a surface with a radius of curvature going towards infinity.
  • an expansion of the light beam may just be desirable or not desirable.
  • An expansion is desired as long as a mixing of the light in the reflector is to be achieved, without thereby the opening angle of the emerging from the light exit side of the reflector beam is too large. Accordingly, a Widening of the light beam on the facet surface may then be undesirable if the widening causes an excessively large opening angle of the radiation beam.
  • a reflector according to the invention may be provided so that a light beam emitted from the emitting surface of the light source toward the facet is reflected at the facet surface and then emerges from the reflector at the light exit side.
  • the angle ⁇ which the beam reflected by the facet surface forms with the longitudinal axis of the reflector is also the angle to the longitudinal axis of the reflector with which the beam emerges from the reflector. Accordingly, the angle ⁇ for all light rays emerging from the reflector must be less than half of the desired opening angle of the illuminant comprising the reflector.
  • the angle ⁇ can be effectively predetermined.
  • a small radius of curvature of the facet can be selected in order to realize high light mixing in the reflector, this being limited by the fact that the radius of curvature in FIG Depending on the facet spacing is varied.
  • the aperture angle of the beam emerging from the reflector can thus be adjusted.
  • the radius of curvature of the facets associated with the curvature in the transverse direction, averaged over all the facets whose center of the surface has the same distance in the transverse direction from the axis extending through the light source point in the longitudinal direction varies as a function of this transverse spacing.
  • the corresponding variation of the curvature in the transverse direction of the facets can ensure that the best possible mixing of light in the reflector is realized with respect to a reflection in the transverse direction at the same time as possible adjustable opening angle of emerging from the reflector beam.
  • the transverse distance refers to the distance from the surface center of a facet to the longitudinal axis of the reflector, which passes through the center of the light-emitting surface of the light source in the reflector.
  • a stronger or weaker widening of a light beam incident on the facet in the transverse direction may be desired in order to realize the best possible light mixing in the reflector with simultaneously adjustable opening angle.
  • the variation of the radius of curvature in the transverse direction of the facets can be effected analogously to the above-described variation of the radius of curvature in the longitudinal direction of the facets.
  • the radius of curvature of the facets associated with the curvature in the longitudinal direction increases with increasing facet spacing.
  • an expansion of the opening angle can effectively be limited to a predetermined opening angle within a predetermined opening angle ⁇ of the beam emerging from the reflector.
  • the curvature radius of the facet associated with the curvature in the transverse direction decreases with increasing transverse spacing.
  • the reflector wall can be rotationally symmetrical about the longitudinal axis of the reflector.
  • a symmetrical illumination by the beam emerging from the reflector and a homogeneous mixing of the light in the beam may be favored.
  • the manufacture of the reflector and the facets contained therein can be carried out in a particularly simple and cost-effective manner.
  • the reflector wall can also have a polygonal cross-section. This can be advantageous, for example, for the mixing of light in the reflector, since in a longitudinal plane of the reflector facets each have a different facet distance to the light source point, so that, for example, the radius of curvature in the transverse direction and / or the longitudinal direction of the facets can be varied in a longitudinal plane, without thereby the opening angle is increased, what for Light mixing may be advantageous.
  • all facets having the same facet spacing may have substantially the same radius of curvature with respect to the longitudinal bulge. This can be particularly advantageous for uniform light mixing and light intensity distribution in the beam emerging from the reflector.
  • all facets having the same transverse distance may have the same radius of curvature with respect to the longitudinal curvature. This can be advantageous for a particularly homogeneous light mixing and light intensity distribution in the beam emerging from the reflector.
  • a light source may be arranged in the reflector so that the center of the emitting surface of a light source coincides with the light source point.
  • the coincidence of the center of the emitting surface of the light source with the light source point enables a particularly precise realization of the light mixing with a simultaneously predetermined opening angle of the emerging from the reflector beam.
  • the invention further relates to a radiator comprising a reflector according to the invention as described above.
  • the radiator further comprises an electronic ballast and a light source, which is arranged in the reflector by means of a provided on the recess in the Reflektorumwandung mounting device so that the Center of the emitting surface of the light source coincides with the light source point.
  • the light source is electrically coupled to the electronic ballast.
  • FIG. 1 is shown in a schematic diagram of the longitudinal section of a reflector 1 according to the invention.
  • the light source 6 is arranged in the recess 7 of the reflector 1 so that the center of the emitting surface 8 of the light source 6 coincides with the light source point 5 of the reflector 1.
  • the reflector wall 2 is rotationally symmetrical in the illustrated embodiment and has a circular cross section in each of its transverse planes as a cross section.
  • the light-emitting surface 8 of the light source 6 faces the interior 3 of the reflector 1.
  • no facets are shown on the inside of the reflector wall 2 facing the interior 3.
  • the light exit side 4 of the reflector 1 of the light emitting surface 8 of the light source 6 is opposite.
  • FIG. 2 is the opening angle ⁇ of the light distribution in a beam emerging from a reflector 1 according to the invention at the light exit side 4, shown. It is in FIG. 2 the light intensity is shown as a function of the opening angle.
  • FIG. 2 shows that from the reflector 1 according to the invention a beam emerges at the light exit side 4, which has a uniformly high light intensity over almost the entire opening angle ⁇ .
  • FIGS. 3 to 5 the principle of a reflector 1 according to the invention is explained in more detail.
  • a reflector 1 whose conversion 2 has a rotationally symmetrical cross section, and which is bell-shaped, wherein the reflector wall 2 is open at the light exit side 4 over the entire transverse extent.
  • facets 9 are arranged.
  • a facet 9 is shown on the inside of the reflector wall 2.
  • the radius of curvature of the illustrated facet 9 is approximately infinite, so that the facet 9 is formed as a flat facet 9.
  • the reflector 1 comprises FIG. 3 a light source 6, which has a diameter D and is also rotationally symmetrical.
  • the center of the emitting surface 8 of the light source 6 coincides with the light source point 5.
  • the angle ⁇ is illustrated, which forms a light beam, which extends from the light source point 5 to the surface center of the facet 9, with the longitudinal axis of the reflector 1.
  • the facet spacing corresponding to the distance between the surface center of the facet 9 and the light source point 5 is shown in FIG FIG. 3 marked with r.
  • the angle ⁇ is defined, which defines the acute angle, the two beams form each other, which extend from a respective opposite transverse end of the emitting surface 8 from the surface center of the facet 9.
  • the dependence of the radius of curvature r L in the longitudinal direction of the facet 9 is determined by the distance r as follows: It is assumed that a beam with the opening angle ⁇ should emerge from the reflector 1 according to the invention.
  • facets 9 with a curvature angle ⁇ which corresponds to a radius of curvature r L , are provided on the reflector wall 2.
  • the curvature of the facet 9 refers to FIG. 4 on the longitudinal direction. It can be assumed that the angle of curvature ⁇ should not be greater than ⁇ - ⁇ if the opening angle of the beam emerging from the reflector 1 should be limited to the angle ⁇ .
  • the angle of curvature ⁇ at a fixed ⁇ of ⁇ depends.
  • the angle ⁇ is as out FIG. 3 , depending on the facet spacing r.
  • the angle ⁇ over the equation ⁇ 2 ⁇ arctan D ⁇ cos ⁇ 2 ⁇ r be approximated.
  • the angle of curvature ⁇ in the longitudinal direction of the facet 9 can be disengaged via simple geometrical calculations as a function of the facet spacing r.
  • the radius of curvature r L of the facet 9 in the longitudinal direction can also be determined as a function of the facet spacing r. If ⁇ is greater than ⁇ , curvature of the facet 9 in the longitudinal direction is to be avoided, and thus a radius of curvature r L to be provided at infinity, so that the surface of the facet 9 is designed to be flat.
  • FIG. 5 It is shown how the radius of curvature r Q of the facet 9 in the transverse direction can be determined as an example depending on the transverse distance x between the surface center of the facet 9 and the light source point 5.
  • FIG. 5 the circular cross section of one of the described reflector 1 according to the invention is shown.
  • the opening angle ⁇ of the beam emerging from the reflector 1 according to the invention should not be increased by the curvature of the facet 9 in the transverse direction.
  • the curvature angle ⁇ in the transverse direction of the facet 9 should not be greater than ⁇ - ⁇ , where ⁇ is the angle which two beams form with each other, from respective opposite transverse ends of the emitting surface 8 of the light source 6 to the surface center of the facet 9 are lost.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)

Claims (7)

  1. Réflecteur (1) pour sources lumineuses semi-conductrices, plus particulièrement pour un dispositif d'éclairage vers le bas, ledit réflecteur comprenant un espace interne (3) délimité par une paroi périphérique de réflecteur (2), ainsi qu'un côté de sortie de lumière (4) disposé à une extrémité longitudinale du réflecteur (1) et auquel l'espace interne (3) est ouvert,
    dans lequel un point de source lumineuse (5) est prévu dans l'espace interne (3) et de manière à être entouré dans la direction transversale du réflecteur circonférentiellement de la paroi périphérique de réflecteur (2), audit point peut être disposé un centre d'une surface émettrice d'une source lumineuse (6) dans le réflecteur, la paroi périphérique de réflecteur (2) présentant un évidement (7), par lequel une source lumineuse (6) disposée dans le réflecteur (1) peut être contactée électriquement et fixée, sur la face intérieure de la paroi périphérique de réflecteur (2) tournée vers l'espace interne (3) étant disposées des facettes (9) qui présentent une surface réfléchissante et bombée dans la direction longitudinale et/ou dans la direction transversale, le rayon de courbure des facettes (9) associé à la courbure dans la direction longitudinale variant en moyenne sur toutes les facettes (9) dont le centre de surface est équidistant du point de source lumineuse (5) en fonction de cette distance des facettes (9), le rayon de courbure des facettes (9) associé à la courbure dans la direction transversale variant en moyenne sur toutes les facettes (9) dont le centre de surface est équidistant par rapport à la direction transversale de l'axe s'étendant à travers du point de source lumineuse dans la direction longitudinale en fonction de cette distance transversale, le rayon de courbure des facettes (9) associé à la courbure dans la direction longitudinale augmentant avec l'augmentation de la distance des facettes, caractérisé en ce que le rayon der courbure des facettes (9) associé à la courbure dans la direction transversale diminue avec l'augmentation de la distance transversale.
  2. Réflecteur selon la revendication 1, caractérisé en ce que la paroi périphérique de réflecteur (2) est symétrique en rotation autour l'axe longitudinal du réflecteur (1).
  3. Réflecteur selon l'une des revendications 1 ou 2, caractérisé en ce que la paroi périphérique de réflecteur (2) présente une section transversale en forme de polygone.
  4. Réflecteur selon l'une des revendications précédentes, caractérisé en ce que toutes les facettes (9) avec la même distance entre les facettes présentent le même rayon de courbure par rapport à la courbure dans la direction longitudinale.
  5. Réflecteur selon l'une des revendications précédentes, caractérisé en ce que toutes les facettes (9) avec la même distance transversale présentent le même rayon de courbure par rapport à la courbure dans la direction longitudinale.
  6. Réflecteur selon l'une des revendications précédentes, caractérisé en ce que dans le réflecteur (1) est disposée une source lumineuse (6) de manière que le centre de la surface émettrice d'une source lumineuse (6) est confondu avec le point de source lumineuse (5).
  7. Émetteur, comprenant un réflecteur (1) selon l'une des revendications 1 à 5, un ballast électronique ainsi qu'une source lumineuse (6) disposée dans le réflecteur à l'aide d'un dispositif de montage prévu sur l'évidemment (7) dans la paroi de réflecteur (7), de telle manière que le centre de la surface émettrice de la source lumineuse (6) est confondu avec le point de source lumineuse (5), ladite source lumineuse (6) étant couplée électriquement au ballast électronique.
EP12189928.0A 2011-10-28 2012-10-25 Réflecteur pour sources lumineuses semi-conductrices Active EP2587132B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011085418A DE102011085418A1 (de) 2011-10-28 2011-10-28 Reflektor für Halbleiterlichtquellen

Publications (3)

Publication Number Publication Date
EP2587132A2 EP2587132A2 (fr) 2013-05-01
EP2587132A3 EP2587132A3 (fr) 2014-06-18
EP2587132B1 true EP2587132B1 (fr) 2017-10-25

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Application Number Title Priority Date Filing Date
EP12189928.0A Active EP2587132B1 (fr) 2011-10-28 2012-10-25 Réflecteur pour sources lumineuses semi-conductrices

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EP (1) EP2587132B1 (fr)
DE (1) DE102011085418A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042915B4 (de) * 2004-09-02 2011-04-14 Erco Gmbh Leuchte zur Ausleuchtung von Gebäudeflächen oder Gebäudeteilflächen
DE102007016748A1 (de) * 2007-04-07 2008-10-09 Tetsuhiro Kano Reflektor für eine Leuchte
DE202007015488U1 (de) * 2007-07-26 2008-12-11 Erco Leuchten Gmbh Leuchte
JP4576490B2 (ja) * 2008-12-09 2010-11-10 フェニックス電機株式会社 発光装置用のリフレクタおよびそれを用いた発光装置
EP2428727B1 (fr) * 2010-08-25 2013-11-13 Jordan Reflektoren GmbH & Co.KG Réflecteur à lampes et son dispositif de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2587132A2 (fr) 2013-05-01
DE102011085418A1 (de) 2013-05-02
EP2587132A3 (fr) 2014-06-18

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