WO2011131429A1 - Guide de lumière plan, luminaire et procédé de fabrication d'un guide de lumière plan - Google Patents

Guide de lumière plan, luminaire et procédé de fabrication d'un guide de lumière plan Download PDF

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Publication number
WO2011131429A1
WO2011131429A1 PCT/EP2011/053992 EP2011053992W WO2011131429A1 WO 2011131429 A1 WO2011131429 A1 WO 2011131429A1 EP 2011053992 W EP2011053992 W EP 2011053992W WO 2011131429 A1 WO2011131429 A1 WO 2011131429A1
Authority
WO
WIPO (PCT)
Prior art keywords
light guide
region
surface light
scattering
area
Prior art date
Application number
PCT/EP2011/053992
Other languages
German (de)
English (en)
Inventor
Peter Brick
Uli Hiller
Stephan Kaiser
Gerhard Kuhn
Ales Markytan
Julius Muschaweck
Christian Neugirg
Original Assignee
Osram Opto Semiconductors 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 Opto Semiconductors Gmbh filed Critical Osram Opto Semiconductors Gmbh
Publication of WO2011131429A1 publication Critical patent/WO2011131429A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • Specify surface light guide which is clear and over which a symbol and / or a lettering can be displayed.
  • the latter has at least one main side which is adjacent thereto
  • At least one main page is a radiating surface. It is also possible that two opposite main sides of the
  • Surface light guide are designed as radiating surfaces.
  • the latter has at least one first region and at least one second region.
  • the surface light guide has at least one first region and at least one second region.
  • Area light guide a plurality of first and second
  • the second areas preferably a symbol or a lettering is formed.
  • the first and the second area are arranged adjacent.
  • the first and second regions directly adjoin one another so that there is no intermediate region between the first and second regions.
  • the first and the second area are respectively, as seen in plan view, contiguous surface areas of the main side.
  • a mean light extraction coefficient of the second region differs by at least a factor of two from a mean light extraction coefficient of the first
  • Average light extraction coefficient may mean that the light extraction coefficient is averaged over the entire area.
  • Lichtauskoppelkoefficient can also mean that along a particular narrow strip perpendicular to the
  • the difference is at least a factor of 3.5,
  • the average light decoupling coefficient is one
  • the light decoupling coefficient indicates which portion of a radiation guided in the surface light guide, in particular per unit length, is coupled out of the surface light guide along a main light direction.
  • the surface light guide has a turbidity value of at most 0.15, preferably at most, both in the first and in the second region, as viewed in a direction perpendicular or in a direction approximately perpendicular to the main side 0.10, in particular of at most 0.05 on.
  • the turbidity value is also referred to as Haze value or Haziness.
  • the turbidity value is defined for transmission as the quotient of the proportion of radiation that is at
  • Passage through a medium is scattered by an angle of more than 2.5 °, and from the entire, through the medium
  • planar light guide has, both in the first and in the second region, in each case a direction perpendicular or nearly perpendicular to the main side
  • the surface light guide is then transparent or almost transparent.
  • the transmission coefficient here is in particular the total transmitted light power divided by the incident light power.
  • the latter has at least one main side designed as a radiating surface and at least one first region and
  • At least a second area Seen in plan view of the main page, the first and the second area are arranged adjacent.
  • Lichtauskoppelkostoryen differ from each other, a symbol or a lettering through the surface light guide can be displayed, if in this a radiation is coupled. Since the surface light guide is clear and transparent, if no or only negligible little radiation is guided in the surface light guide, the first and the second region are not or with the naked human eye
  • an area ratio of the first area at the main side designed as a radiating surface is at most 40%
  • the second region or all the second regions taken together have an area that is smaller than a surface of the first region or of all first regions.
  • the latter has a light guide body, which is preferably designed to guide a radiation in the surface light guide by means of total internal reflection.
  • Light guide is guided a guided in the surface light guide radiation.
  • the light guide body is preferred
  • the first area is formed integrally and coherently and extends in particular both over the first area as well over the second area.
  • the second area is formed integrally and coherently and extends in particular both over the first area as well over the second area.
  • the light guide body preferably has a uniform thickness. In other words, a thickness of the light guide body over the entire surface light guide is constant, in the context of
  • Thickness means the geometric thickness of the light guide.
  • the light guide can be any shape.
  • the scattering agent may be added at least one scattering agent completely or in some areas.
  • the scattering agent may be
  • a scattering body is, for example, such a body which has a light output coefficient which is higher by at least a factor of 2 or by a factor of 3.5, in particular by a factor of 5 or by a factor of 10 than the light-conducting body.
  • a base material of the first and the second region are free of connecting means and / or form-fitting and preferably formed directly on one another.
  • first region is formed for example by a first casting compound and the second region by a second casting compound.
  • first and the second region are in particular formed at the same time and preferably in the same casting mold.
  • the light guide can be formed.
  • the first region surrounds the second region in one
  • one of the areas is embedded in the others.
  • one of the first regions is completely enclosed laterally by the second region and the second one
  • the shaped bodies do not completely penetrate the light guide body in a direction perpendicular to the main side.
  • the moldings do not extend from one main page to the opposite main page.
  • one or even both main sides are completely formed by one of the basic materials of the regions.
  • the shaped bodies of the first or second regions are also in the direction perpendicular to one of the main sides of base material of the second or first regions
  • a mean concentration of the differs
  • the concentration indication may be an indication of particles per unit volume. If different types of scattering agents are used in the first area and in the second area, concentration in the present context may also be used
  • An average concentration of the scattering agent in particular in the region of greater concentration, is, for example, between 100 and 100,000 particles per mm 2, in particular between 250 and 50,000 particles per mm 2 or between 500 and 25,000 particles per mm 3 or between 1,000 inclusive and 15000 particles per mm ⁇ .
  • a mean scattering cross section per scattering point of the scattering means is at one wavelength a radiation to be conducted in the surface light guide in this case, for example, between 0.001 ym 2 and 25 ym 2 , in particular between 0.01 ym 2 and 5 ym 2 , preferably between 0.025 ym 2 and 1.5 ym 2 .
  • the light extraction coefficient is within the at least one first or second region along the
  • a (z) (a, Q + k z) / (1 -ag z),
  • CXQ is a light extraction coefficient of the
  • L is an extension of the light guide body or the corresponding first or second area along the main light guide z.
  • k is a real number and can be given in m -2 .
  • L, z, k as well as ⁇ can also
  • Light extraction coefficient one of the above Relationships preferably over all of these, for example, first areas seen across.
  • the light extraction coefficient follows one of the above
  • the average light extraction coefficient of the second region is preferably smaller than the middle one
  • the first and the second region are defined by a roughening or by at least one diffuser.
  • a roughening or by at least one diffuser In other words, either exclusively in the first area or only in the second area is one
  • the light-guiding body is preferably continuous and formed in one piece and made of one
  • the scattering body (4) is arranged on one of the main side (2).
  • this is a jump in the optical
  • a luminaire is specified with a surface light guide according to one of the previous embodiments.
  • the luminaire In at least one embodiment, the luminaire
  • the light source is preferably light emitting diodes, in particular inorganic light emitting diodes based on a semiconductor material such as GaN or GaP.
  • a mean luminance of the first range differs from one here
  • the different luminances are in particular by the different
  • the luminaire comprises at least one mirror.
  • the mirror is preferably attached to the other main side of the surface light guide, the other main side being the radiating surface
  • the mirror is optically attached directly to the surface light guide.
  • Optically immediate can mean that between the surface light guide and the mirror no jump in
  • optical refractive index in particular no air gap, is present.
  • Luminaire are therefore also disclosed for the process and vice versa.
  • this includes the steps:
  • FIGs 1 to 7 and 10 to 12 are schematic representations of embodiments of luminaires described herein with here described
  • Figure 8 is a schematic representation of a
  • Figure 9 is a schematic representation of another
  • Figure 1 is a schematic plan view of a
  • the light sources 6 are attached to two opposing end faces of a light guide body 3, which are arranged as light entry sides 7.
  • a radiation R During operation of the light sources 6, a radiation R,
  • Surface light guide 1 has a first region 11 and a second region 22.
  • the second area 22 is in
  • An average light extraction coefficient of the second region 22 is greater than a mean one
  • the second region 22 appears brighter than the first region 11.
  • the light-conducting body 2 extends both over the first region 11 and over the second region 22 and is designed in one piece and coherently.
  • FIG. 10 Another embodiment of the luminaire 10 is illustrated in a schematic cross section in FIG. In the second region 22 is in the light guide 3 a
  • Light entrance side 7 generated radiation R.
  • various beam paths are shown.
  • a scattering of the radiation R occurs approximately exclusively in the region 22.
  • the radiation R can be radiated on such a partial surface of the main side 2, which appears at angles to the scattering means 40, which are smaller than a total reflection angle.
  • a lateral extent of the second region 22 is therefore
  • the first region 11 a decoupling of radiation from the light guide body 3 takes place only via so-called Fresnel reflections, via which only a small and / or negligible proportion of the radiation R can be coupled out.
  • the first regions 11 therefore appear in operation of the light sources 6, as compared to the second
  • Diffuser 4 preferably formed by particles, wherein the particles, for example, a mean diameter
  • the particles of the scattering agent 40 consist of or comprise, for example, at least one of the following
  • the scattering means 40 is embedded in particular in a base material 18 of the light guide body 3.
  • the base material 18 is, as in all other embodiments, for example polycarbonate, PC for short, polymethyl methacrylate, PMMA for short, or a glass.
  • Lamp 10 can be, as well as in all others
  • Embodiments behave as follows: A
  • Feature width W of the second region 22 is at least twice a thickness T of the light guide body 3,
  • An extension L in particular an overall extension of the light guide body 3 or an extension of all the first regions 11 along the main light guide z, is at least ten times the thickness T of
  • Light guide 3 in particular at least one
  • the thickness T of the light guide 3 is preferably between
  • FIG. 3 A further exemplary embodiment of the luminaire 10 is shown in FIG. 3 in a schematic side view. On one of the arranged as a radiating surface main page 2
  • Surface light guide 1 is on the light guide 3 a Diffuser 4 attached.
  • the scattering body 4 has the scattering means 40.
  • Optical guide 3 is seen over the entire surface light guide 1 along the main light direction z away, designed with the same material and is preferably free of a scattering agent.
  • a scattering agent 40 may also be added to the light-guiding body 3 in a low concentration.
  • the thickness D of the scattering body 4 is a ratio of a thickness D of the scattering body 4 and the thickness T of the light guide 3 preferably between 0.2 and 1, in particular between 0.25 and 0.75.
  • the thickness D of the scattering body 4 is a ratio of a thickness D of the scattering body 4 and the thickness T of the light guide 3 preferably between 0.2 and 1, in particular between 0.25 and 0.75.
  • scattering body 4 is at most 20% or at most 10% or at most 5% of the extent L of
  • the structure width W of the scattering body 4 is, for example, at least one double or at least one fivefold, in particular at least ten times the thickness D of the scattering body 4. Further preferred is the
  • Diffuser 4 occurs, which is greater than 0.2 or as 0.05.
  • both the light guide body 3 and the scattering body 4 are based on the same base material and have the same refractive index. Unlike the embodiment of Figure 3 are the
  • the relationships between the thickness D shown in FIG Structure width W and the thickness T of the light guide body 3 preferably also apply to the exemplary embodiment according to FIG. 4.
  • the diffuser 4b which is farther from the light source 6, to have a larger size
  • the scattering body 4b has a lower light power compared to the scattering body 4a within the light guide body 3, which can be compensated by, for example, different concentrations of a scattering agent in the scattering bodies 4a, 4b. If the scattering bodies 4a, 4b have comparatively large lateral expansions along the main side 2, then it is also possible for the scattering means 40 to be distributed inhomogeneously in the optical waveguides 4a, 4b and to concentrate in a direction away from the light source 6 within one of the Scattering body 4 increases.
  • a specific luminance of the light extraction decoupled regions 11, 22 is for example at least 5 cd / m 2, preferably at least 10 cd / m 2 or at least 25 cd / m 2.
  • FIGS. 5 and 6 show schematic side views of further exemplary embodiments of the luminaire 10, in which the light-guiding body 3 is provided with a roughening 5, 5a, 5b. According to Figure 5, the roughening 5 at the Main page 2 facing away from another main page 20 of the
  • the second region 22 is arranged to emit radiation generated by the light source 6. Only the roughening 5 or even the entire second main side 20 are optional with a reflective coating
  • the roughenings 5a, 5b are in the first
  • the first regions 11 are therefore designed to emit radiation generated in the light source 6.
  • the roughening 5b can lead to a higher light extraction coefficient than the roughening 5a, in each case based on one area unit.
  • the roughenings 5, 5a, 5b according to FIGS. 5 and 6 are designed in such a way that the surface light guide 1 in FIG.
  • partial areas of the roughenings 5, 5a, 5b have angles to the main light direction z of less than 4 ° or less than 2 °.
  • the roughenings 5, 5 a, 5 b are structured, for example, by means of grinding, sandblasting or dry-chemical or wet-chemical etching, in particular with the aid of a mask which covers either the first regions 11 or the second regions 22.
  • the roughening can be irregular or regular.
  • the light emission on the main side 2 preferably takes place via, for example, the first regions 11 homogeneous. A local luminance of the main side 2 deviates from averaged over the entire first region 11
  • the surface light guide 1 has a non-rectangular plan, for example a circular or elliptical plan.
  • the surface light guide 1 has, for example, an all-round light entry side 7, which is not interrupted by edges.
  • the light sources 6 are preferably arranged rotationally symmetrically on the light entry side 7.
  • Figure 8 is an embodiment of a
  • a base body 16 is provided. From the base body 16 are molded body 15, for example, the word OSRAM represent, about a saw, a
  • the molded bodies 15 forming, for example, the second regions 22, are, as shown in FIG. 8B, in a shape 17 corresponding to the later ones
  • the scattering body 4 are thus manufactured in particular separately from the light guide 3 and completely formed at the time of
  • the feature width W is in particular a line width of the letters of Lettering.
  • the feature width W corresponds to a minimum feature size to be displayed.
  • Regions 22 of the base material 18 for the first regions 11 encapsulated or overmolded, at least in a lateral direction. Subsequently, the base material 18 is cured. Thus, the molded bodies 15 for the second regions are formed separately from the first regions 11.
  • Curing of the base material 18 for the first regions 11 is a positive, connection-free and mechanically strong connection between the base material 18 and the moldings 15. By curing or solidification of the base material 18 so the one-piece, continuous Lichtleit stresses 3 is formed.
  • the first regions 11 and the second regions 22 may be made of the same or different basic materials 18. Alternatively, it is also possible that the first
  • Areas 11 and the second regions 22 are made by, for example, a two-component injection molding substantially simultaneously in the same mold 17.
  • Scattering agent and the base material 18 for the first regions 11 is added to a scattering agent 40.
  • the Scattering agent 40 is selectively distributed inhomogeneous in the light guide 3. It is illustrated in FIGS. 8D and 12B that when the light sources 6 are switched off, the lettering which is formed by the second regions 22 can not be recognized. In addition to lettering, other patterns, symbols and / or pictograms can also be constructed and displayed by the first regions 11 and the second regions 22.
  • FIG. 9A it is illustrated that the molded bodies 15 extend from the main side 2 as far as the further main side 20 and, in a direction perpendicular to the main side 2, thus completely penetrate the optical waveguide 3.
  • One of the first regions 11 is completely enclosed laterally by the two second regions 22, which in turn are laterally separated from the two peripheral regions 1
  • Regions 11 are shown, see Figure 8C.
  • the shaped bodies 15 penetrate the light-guiding body 3 in a direction perpendicular to the light guide body 3
  • the shaped bodies 15 preferably form part of the main side 2.
  • a configuration of the molded body 15 is for example a
  • Shaped body 15 are connected to each other, preferably to facilitate placing and / or injection molding of the molded body 15.
  • the luminaire 10 has a mirror 8 on the further main side 20.
  • Mirror 8 preferably reflects completely or predominantly specularly, so that the angles of incidence of the reflected
  • the scattering means 40a, 40b are present both in the first regions 11 and in the second regions 22 of the light guide body 3, the concentrations of the scattering means 40a, 40b or the scattering cross sections caused thereby being preferred deviate by at least a factor of 2.
  • the mirror 8 is formed for example by a glued foil or by a vapor-deposited layer.
  • Light guide 9 mounted, for example, in each case glued so that no significant refractive index jump
  • the scattering body 4 is in the lateral direction of air or other medium with low optical
  • Refractive index of the scattering body 4 is surrounded.

Landscapes

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

Abstract

Dans au moins un mode de réalisation, l'invention concerne un guide de lumière plan (1) qui présente au moins une face principale (2) conçue comme surface de rayonnement ainsi qu'au moins une première zone (11) et au moins une deuxième zone (22), la première zone (11) et la deuxième zone (22) étant disposée au voisinage l'une de l'autre, vu au-dessus de la face principale (1). Un coefficient de découplage de lumière moyen de la deuxième zone (22) diffère d'au moins un facteur 2 d'un coefficient de découplage de lumière moyen de la première zone (11). Pour la première zone (11) et la deuxième zone (22), vu respectivement dans une direction perpendiculaire à la face principale (2), une valeur d'opacité s'élève au maximum à 0,15 et un coefficient de transmission est d'au moins 0,70.
PCT/EP2011/053992 2010-04-23 2011-03-16 Guide de lumière plan, luminaire et procédé de fabrication d'un guide de lumière plan WO2011131429A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010018029 DE102010018029A1 (de) 2010-04-23 2010-04-23 Flächenlichtleiter, Leuchte und Verfahren zur Herstellung eines Flächenlichtleiters
DE102010018029.7 2010-04-23

Publications (1)

Publication Number Publication Date
WO2011131429A1 true WO2011131429A1 (fr) 2011-10-27

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PCT/EP2011/053992 WO2011131429A1 (fr) 2010-04-23 2011-03-16 Guide de lumière plan, luminaire et procédé de fabrication d'un guide de lumière plan

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DE (1) DE102010018029A1 (fr)
WO (1) WO2011131429A1 (fr)

Cited By (1)

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WO2024100117A1 (fr) 2022-11-11 2024-05-16 Karl Storz Se & Co. Kg Dispositif d'éclairage et dispositif de formation d'images doté d'un dispositif d'éclairage

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US20140132883A1 (en) * 2012-11-13 2014-05-15 3M Innovative Properties Company Optical stack including light extraction layer and polymer dispersed liquid crystal layer
DE102014116778A1 (de) * 2014-11-17 2016-05-19 Osram Opto Semiconductors Gmbh Verfahren zur Herstellung eines Konversionselements, Konversionselement sowie optoelektronisches Bauelement mit einem solchen Konversionselement
DE102017108829A1 (de) * 2017-04-25 2018-10-25 Pas Deutschland Gmbh Transparente Struktur, Anzeigevorrichtung, Haushaltsgerät und Verfahren zum Herstellen einer transparenten Struktur

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EP0457009A2 (fr) * 1990-05-17 1991-11-21 Nissen Kagakukogyo K.K. Membre réflecteur de lumière, procédé de fabrication et utilisation
US6206535B1 (en) * 1999-11-30 2001-03-27 Hayashi Telempu Co., Ltd. Planar lighting device and method of making light guides used therein
US20070183040A1 (en) * 2003-03-13 2007-08-09 Sinyugin Andrei V Device for obtaining light images
US20070127264A1 (en) * 2005-10-18 2007-06-07 Alps Electric Co., Ltd. Surface emitting device
US20090161388A1 (en) * 2005-12-14 2009-06-25 Omron Corporation Display unit
EP2009615A1 (fr) * 2006-04-20 2008-12-31 Fujikura, Ltd. Dispositif d'affichage et son procede de fabrication, procede d'affichage de motifs, et dispositif d'obturation et procede associe
WO2008058972A1 (fr) * 2006-11-15 2008-05-22 BSH Bosch und Siemens Hausgeräte GmbH Dispositif d'éclairage sur un appareil ménager
WO2009013930A1 (fr) * 2007-07-20 2009-01-29 Omron Corporation Dispositif d'affichage optique et dispositif de source lumineuse de surface
WO2009116009A1 (fr) * 2008-03-19 2009-09-24 I2Ic Corporation Source lumineuse directionnelle utilisant un système optique de réfraction et de réflexion

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024100117A1 (fr) 2022-11-11 2024-05-16 Karl Storz Se & Co. Kg Dispositif d'éclairage et dispositif de formation d'images doté d'un dispositif d'éclairage
DE102022129909A1 (de) 2022-11-11 2024-05-16 Karl Storz Se & Co. Kg Beleuchtungsvorrichtung und Bildgebungsvorrichtung mit einer Beleuchtungsvorrichtung

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