EP2561388A2 - Guide de lumière plan et luminaire - Google Patents

Guide de lumière plan et luminaire

Info

Publication number
EP2561388A2
EP2561388A2 EP11710732A EP11710732A EP2561388A2 EP 2561388 A2 EP2561388 A2 EP 2561388A2 EP 11710732 A EP11710732 A EP 11710732A EP 11710732 A EP11710732 A EP 11710732A EP 2561388 A2 EP2561388 A2 EP 2561388A2
Authority
EP
European Patent Office
Prior art keywords
light guide
surface light
main
scattering
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.)
Withdrawn
Application number
EP11710732A
Other languages
German (de)
English (en)
Inventor
Peter Brick
Julius Muschaweck
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.)
Siteco GmbH
Original Assignee
Osram GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2561388A2 publication Critical patent/EP2561388A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • a surface light guide is specified.
  • a light is specified.
  • One problem to be solved is to emit a uniformly radiating surface light guide and a
  • planar light guide has two main sides facing one another and at least one set up as a light entry side
  • the front side is one here
  • Light entrance side means that this page to do so
  • the planar light guide has at least one main light guide direction, which extends away from the light entry side.
  • the surface light guide can have several Stilbitleitidesen
  • this comprises a scattering means for scattering light.
  • the scattering agent has a specific scattering cross section. Due to the scattering of the light at the scattering means, an angle of the light, relative to the main sides, is changed, in particular light hits after one or more
  • the scattering means is also a
  • spreading agent includes, in particular, sites which are formed by particles and / or by defects and / or by cavities.
  • the coupling-out coefficient is along the
  • Decoupling coefficients are based exclusively or essentially on a specific distribution of the scattering agent within the surface light guide. Under distribution In particular, the litter must not be understood as a statistically determined, local concentration fluctuation.
  • this has, in particular in a direction perpendicular
  • At least one of the main sides has a turbidity value of at most 0.10, preferably of at most 0.05.
  • Turbidity value is also referred to as Haze value or Haziness.
  • the turbidity value is for example
  • Transmission is defined as the quotient of the proportion of radiation that is scattered when passing through a medium through an angle greater than 2.5 °, and the total radiation transmitted through the medium. In other words, the surface light guide is then clear or near
  • this has, in particular in a direction perpendicular
  • Transmission coefficient at least 85%, in particular at least 90%.
  • At least one of the main sides has a continuous radiation area, which is provided in the
  • Area light guide emitted light to radiate the emission area forms a radiating surface the main pages.
  • the radiating region preferably extends over the entire main side or over a majority of the main side, for example over more than 90% or over more than 95% of a surface of the main side.
  • the surface light guide has exactly one radiation area per main page.
  • a quotient of a minimum luminance and a maximum luminance, as seen over the at least one emission area is at least 0.75, preferably at least 0.80 or at least 0.85, in particular when radiation is guided into the surface light guide.
  • the surface light guide is configured to have one in the
  • the latter has two main sides opposite one another and at least one set up as a light entry side
  • At least one Kleinlichtleitraum runs away from the light entrance side.
  • Surface light guide includes at least one scattering means for scattering light, wherein by the scattering means
  • the coupling-out coefficient is set varying along the main light-guiding direction. In a direction perpendicular to one of the main sides, there is a haze value of
  • Radiating range of at least one of the main sides at least 0.75.
  • the at least one emission region of the surface light guide appears uniformly bright during the operation of the light source. Outside the operation of the light source, the surface light guide then acts clear, for example similar to a window pane, and thus absorbs little
  • the coupling-out coefficient follows along the
  • W represents an average extension of the emission area along the main direction of light z.
  • K is a real number and may be, for example, in m -2 z is arbitrarily scalable, but preferably has values between 0 and W inclusive.
  • W, z, k and ⁇ can also be given in units.
  • the surface light guide this is formed from at least two or exactly two mutually different basic molding compounds.
  • the basic molding compounds have different, medium specific
  • Auskoppelkostoryen can then be a kind of discontinuous phase transition at a boundary of the basic molding compositions.
  • a surface light guide is, for example, by means of a multi-component injection molding, in particular one
  • Two-component injection molding can be produced.
  • Material components in injection molding are preferably processed and / or shaped in the same casting mold.
  • the latter has at least one or exactly one basic molding compound which comprises the scattering agent. Furthermore, the Surface light guide at least one or exactly one basic molding compound, which is free of the scattering agent.
  • the basic compounds can, as in the other
  • Embodiments as a base material have the same material, wherein in the one of the basic molding compounds, for example, particles of the scattering agent are embedded in the base material acting as a matrix material and the other of the
  • Basic molding compound has only the base material.
  • Scattering agent is preferably in the form of particles with an average particle diameter in particular between
  • this comprises at least two or exactly two
  • scattering agents means that they are in terms of a material from which the scattering agents are formed, or with respect to geometric characteristics of the
  • this comprises at least two or exactly two
  • the latter has exactly one basic molding compound in which, preferably, exactly one scattering agent is distributed in a targeted inhomogeneous manner.
  • the surface light guide can in this case have a constant, uniform thickness. It is possible that a concentration of the scattering means varies only along the at least one main light direction and in the direction perpendicular to the main side, in the context of
  • the lamp includes in particular one or more
  • this includes a surface light guide, as indicated in connection with one of the preceding embodiments.
  • the lamp comprises at least one electric
  • the light source is attached to at least one of the end faces of the surface light guide.
  • the luminaire has a plurality of light sources.
  • the light sources are preferably located on exactly one of the front sides or on exactly two opposite end sides or on exactly four mutually opposite end faces.
  • the light sources comprise light-emitting diodes or consist of the light sources from light emitting diodes and optional electric and / or
  • the light-emitting diodes are arranged like a strip along at least one of the end sides.
  • the luminaire it emits in operation on both main sides of the luminaire
  • the luminaire is designed to emit light on both sides, preferably equally strong or approximately equally strong. When switched off, the light in the area of the surface light guide particularly preferably appears translucent and clear.
  • a surface light guide described here and a luminaire described here will be explained in more detail with reference to the drawings with reference to embodiments.
  • the same reference numerals indicate the same elements in the individual figures. However, they are not
  • FIGS 1 to 4 and 7 are schematic representations of
  • Figure 5 are schematic representations of a course of a
  • Figure 6 is a schematic representation of a
  • Figure 1A is a plan view and in Figure 1B a
  • Surface light guide 1 has two basic molding compounds 7a, 7b, to each of which a scattering agent 5 is added.
  • Scattering agent 5 is in the form of particles.
  • An average diameter of the particles is preferably between
  • the particles of the scattering agent 5 consist of or comprise, for example, at least one of the following components: silicon dioxide, titanium dioxide,
  • the particles of the scattering agent 5 are randomly distributed in the unfused basic molding compounds 7a, 7b.
  • Basic molding compounds 7a, 7b have the same base material in which the particles of the scattering agent 5 are embedded.
  • the base material is or includes, for example
  • the base materials of the basic molding compounds 7a, 7b are: Polymethyl methacrylate, PMMA for short, or polycarbonate, PC for short.
  • the base materials of the basic molding compounds 7a, 7b are:
  • various scattering agents 5 are added, which differ from each other in an average particle diameter and / or in a material of the particles. As a result, the
  • Basic molding compound 7b thereby forming a lower proportion of radiation from the surface light guide 1 through the basic molding compound 7a is decoupled. Except at an interface between the scattering means 5 and the basic molding compounds 7a, 7b or within the scattering means 5, occurs in the surface light guide first
  • Surface light guide 1 are flat and smooth and arranged parallel to each other. Smooth or optically smooth means, for example, that a change in direction of a local normal vector of the main sides 2a, 2b on one
  • Length scale of for example 1 ⁇ or for example 100 ⁇ is not more than 2 °.
  • the main sides 2a, 2b are
  • Radiation area A of the surface light guide 1 therefore extends over the entire main sides 2a, 2b.
  • the main sides 2a, 2b are connected to one another via end faces 3, which are made flat.
  • end faces 3 At the end faces 3 is in each case a strip of a plurality of light sources 6, which are formed by light-emitting diodes mounted.
  • Opposite end faces 3 thus also represent light entry sides 4, on the light in the
  • Surface light guide 1 is coupled.
  • the light entry sides 4, as well as in all others are coupled.
  • Embodiments with a roughening or a
  • the surface light guide 1 can be produced, for example, by means of two-component injection molding, in particular in a so-called endless belt.
  • a thickness D of the surface light guide 1 and of the entire luminaire 10 is preferably between 1 mm and 25 mm inclusive, in particular between 2 mm and 15 mm inclusive.
  • a width W of the surface light guide 1 is for example more than 50 mm, in particular between 50 mm and 1 m, for example approximately 150 mm.
  • Radiation range A is preferably at least 100 cm ⁇ , at least 750 cm ⁇ or at least 2000 cm ⁇ .
  • the electrically operable light sources 6 can directly to the end faces 3 and to the
  • Light entry 4 may be appropriate. Unlike drawn, it is also possible that the light sources 6 of the
  • Light entry sides 4 are arranged spaced apart, as well as in all other embodiments. A distance between the light entry sides 4 and the light sources 6,
  • the luminaire 10 according to FIG. 1 is free of further scattering means in addition to those in the basic molding compounds 7a, 7b
  • Main sides 2a, 2b of the surface light guide 1 smooth or optically smooth and the surface light guide 1 is not provided with a diffuser film. Seen in a direction parallel to the solder L, the surface light guide 1 thus acts for a viewer, in particular when switched off
  • Light sources 6, not milky or cloudy, but clear and transparent.
  • the clarity when the light sources 6 are switched off is achieved in particular in that the main sides 2a, 2b are smooth and that the particles of the scattering agent 5
  • the surface light guide 6 in the emission region A is in particular free of structures, such as outcoupling structures, which are visible to the naked human eye.
  • FIG. 2 shows further side views of FIG
  • the basic molding compound 7a is free of a scattering agent.
  • the scattering means 5 is present exclusively in the basic molding compound 7b, in which the scattering agent 5 is distributed uniformly and statistically.
  • the basic molding compound 7b extends to each other
  • the basic molding compound 7b does not reach the main sides 2a, 2b with the scattering means 5 in each case. In other words, in a direction perpendicular to the main sides 2a, 2b, the basic molding compound 7b with the scattering means 5 in the
  • Basic molding compound 7a embedded without scattering agent According to FIG. 2B, the basic molding compound 7a is free of one
  • the basic molding compound 7b with the scattering means 5 is present in two separate regions which extend away from the main sides 2a, 2b, respectively. A proportion of the basic molding compound 7b, seen in a direction perpendicular to the main sides 2a, 2b, increases along the
  • Main light direction z in the context of manufacturing tolerances monotonous or strictly monotonous.
  • the basic molding compound 7b does not reach up to the light entry side 4, but extends to one of the light entry side 4
  • the light sources 6 are only attached to one of the end faces 3, as in FIG. 2C.
  • Concentration of the scattering agent 5 in the basic molding compound 7b is higher, whereby the basic molding compound 7b has a larger specific scattering cross-section or specific
  • Auskoppelkostoryen has as the basic molding compound 7a.
  • the basic molding compound 7b widens, seen in a side view,
  • the basic molding compound 7b extends to the
  • Main pages 2a, 2b zoom.
  • a mirror 8 is optionally attached.
  • the mirror 8 can be designed to be diffuse or specularly reflective. Unlike shown, it is also possible that one of the main sides 2a, 2b with a preferably specular, so according to the
  • Reflection law reflective mirror is provided. In turned off state of the light sources 6 acts
  • Surface light guide 1 only a single basic molding compound 7, in which the particles of the scattering agent 5 are distributed inhomogeneous. Thus, a concentration of the particles of the scattering agent 5 in a central region of the surface light guide 1 is greatest and decreases towards the light entry sides 4 steadily.
  • the surface light guide 1 may optionally have one or, in contrast to the drawing, a plurality of constrictions 9 in addition to the scattering means 5.
  • the constriction 9 is formed by the main side 2b being at an angle to the main side 2a which has just been formed.
  • An angle between the main sides 2a, 2b is preferably between 0.5 ° and 4 °, in particular between 1.25 ° and 2.5 °. Through this small angle between the main sides 2a, 2b
  • the surface light guide 1 takes place, when viewed through the surface light guide 1, no significant distortion of the transmitted radiation.
  • the surface light guide 1 is also clear-sighted in this case and does not distort the prism.
  • the light sources 6 are furthermore fastened to the surface light guide 1 via a frame 60.
  • the frame 60 is impermeable to light, for example, and partially extends to the main sides 2a, 2b.
  • Radiation area A is only through such areas of
  • Main side 2a, 2b which are uncovered by the frame 60.
  • a corresponding arrangement can also be present in all other embodiments.
  • the light sources 6 are at all four
  • the surface light guide 1 has a rectangular cross section. In a central region of the surface light guide 1, seen in plan view, a
  • the light sources 6 preferably do not reach each other as far as corners of the planar light guide 1.
  • FIGS. 1, 2A and 3. A bell-shaped course of the coupling-out coefficient according to FIG. 5B is present in particular in the exemplary embodiments according to FIGS. 1, 2A and 3.
  • a maximum intensity I max is within an angular range of +/- 20 ° to the Lot L before.
  • a maximum intensity I in an angular range with angles of> 70 ° to the solder L is at most 0.5, preferably at most 0.3 of the maximum intensity I max .
  • the turbidity value is equal to
  • Angular region a is emitted, and from the total, transmitted intensity. Those rays which, when passing through the surface light guide 1, undergo a directional deviation of ⁇ 2.5 ° with respect to an ideally transmitting, plane-parallel plate, are not scattered.
  • the angle range a which is considered not to be scattered, is delimited in FIG. 7A by a dashed-dotted line from an angular range b, in which the transmitted beams are regarded as scattered or as little scattered.
  • the turbidity value is defined
  • FIG. 7C shows a modified light guide 1 'to which no scattering agent has been added.
  • Light source 6 the radiation remains at a constant intensity along the
  • the main pages 2 are subdivided into identically sized, notional sections.
  • the individual sections which the surface light guide 1 in the direction perpendicular to the
  • Main pages 2 have lateral dimensions, for example, have at most 1/20 or at most 1/100 of the width W of the radiation area A.
  • Sections is a radiation intensity I approximately equal.
  • the decoupling coefficients are to be given averaged over each of the sections, for example.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Led Device Packages (AREA)

Abstract

Dans au moins un mode de réalisation, l'invention concerne un guide de lumière plan (1) qui présente au moins un moyen de diffusion (5) pour diffuser la lumière, le moyen de diffusion (5) créant un coefficient de découplage. Le coefficient de découplage est réglé variable le long d'une direction principale de guidage de lumière (z). Dans une direction (L) perpendiculaire aux faces principales (2) du guide de lumière plan (1), une valeur d'opacité s'élève au maximum à 0,10, un coefficient de transmission est d'au moins 0,75 et le quotient entre une luminance minimale et une luminance maximale, vu sur l'ensemble d'une zone de rayonnement (A) d'au moins une des faces principales (2), représente au moins 0,75.
EP11710732A 2010-04-23 2011-03-21 Guide de lumière plan et luminaire Withdrawn EP2561388A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010018028A DE102010018028A1 (de) 2010-04-23 2010-04-23 Flächenlichtleiter und Leuchte
PCT/EP2011/054226 WO2011131434A2 (fr) 2010-04-23 2011-03-21 Guide de lumière plan et luminaire

Publications (1)

Publication Number Publication Date
EP2561388A2 true EP2561388A2 (fr) 2013-02-27

Family

ID=43982257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11710732A Withdrawn EP2561388A2 (fr) 2010-04-23 2011-03-21 Guide de lumière plan et luminaire

Country Status (5)

Country Link
US (1) US9182531B2 (fr)
EP (1) EP2561388A2 (fr)
CN (1) CN102906607B (fr)
DE (1) DE102010018028A1 (fr)
WO (1) WO2011131434A2 (fr)

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Also Published As

Publication number Publication date
CN102906607A (zh) 2013-01-30
US9182531B2 (en) 2015-11-10
DE102010018028A1 (de) 2011-10-27
US20130114291A1 (en) 2013-05-09
WO2011131434A2 (fr) 2011-10-27
CN102906607B (zh) 2016-03-09
WO2011131434A3 (fr) 2012-01-12

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