EP1929200A1 - Dispositif d'eclairage - Google Patents

Dispositif d'eclairage

Info

Publication number
EP1929200A1
EP1929200A1 EP06775850A EP06775850A EP1929200A1 EP 1929200 A1 EP1929200 A1 EP 1929200A1 EP 06775850 A EP06775850 A EP 06775850A EP 06775850 A EP06775850 A EP 06775850A EP 1929200 A1 EP1929200 A1 EP 1929200A1
Authority
EP
European Patent Office
Prior art keywords
radiation
reflector layer
lighting device
reflector
radiation source
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Withdrawn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
EP06775850A
Other languages
German (de)
English (en)
Inventor
Simon BLÜMEL
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.)
Ams Osram International GmbH
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 EP1929200A1 publication Critical patent/EP1929200A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/14—Arrangements of reflectors therein
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • 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
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/40—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of hollow light guides
    • 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
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • 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 present invention relates to a
  • Lighting device with a radiation source and a radiation exit surface.
  • a laterally homogeneous distribution of the radiation power generated by the radiation source on the radiation exit side is frequently desired.
  • the specific radiation watt of the radiant output per m 2 of the exit surface passing from an exit surface
  • a homogeneous distribution of the irradiance (watt of the radiant power per m 2 of the impact surface striking the surface to be illuminated) on a surface to be illuminated by means of the illumination device can thus be facilitated.
  • An object of the present invention is to provide a, in particular planar, lighting device, which comprises the formation of a homogeneous distribution of the radiation power on a radiation exit surface of the illumination device in the lateral direction. facilitated .
  • a lighting device should be specified, which can be made compact.
  • Embodiments of the invention are the subject of the dependent claims.
  • An illumination device comprises a radiation exit surface, a reflector arrangement which has a first reflector layer and a second reflector layer, and a radiation source, wherein the first reflector layer is arranged between the radiation exit surface and the radiation source, radiation generated by the radiation source partially transmits the first reflector layer and the second Reflector layer on the radiation exit surface opposite side of the first reflector layer • is arranged.
  • the reflector arrangement is preferably designed in such a way that radiation striking the first reflector layer is partially reflected in a targeted manner away from the radiation exit surface.
  • Back reflection at the second reflector layer may be reflected obliquely at the first reflector layer radiation component laterally from the point of incidence of the first reflection on the. spaced apart meet the first reflector layer and pass through it or be further reflected.
  • radiation generated power is advantageous in sequence on the first reflector layer and, accordingly, also on the simplified St 'rahlungsaustrittsflache laterally by means of the reflector arrangement of the radiation source is homogeneously distributed.
  • the first and the second reflector layer are arranged at a distance from one another. Furthermore, the side of the first reflector layer facing away from the radiation source can form the radiation exit surface of the reflector arrangement or the illumination device.
  • Radiation source to be illuminated can advantageously be arranged close to the first reflector layer, whereby the lateral distribution of the radiation power is accomplished by the reflector arrangement.
  • the formation of a small and compact lighting device with a small thickness and correspondingly small overall depth is advantageously facilitated in the sequence, without the lateral homogeneity of the illumination being impaired.
  • the area illuminated on the radiation exit side can advantageously be enlarged compared to a lighting device in which a first reflector layer is dispensed with be. If a first reflector layer is dispensed with, then the region of the surface to be illuminated, which is illuminated by means of the radiation source, is often determined by the radiation cone of the radiation source. • The use of the reflector arrangement, the illuminated area can - at the same distance of the radiation source from the surface to be illuminated - to be increased to the reflector layers due to the (multi-) reflection. Due to the reflection, the first and the second reflector layer furthermore contribute substantially to the homogenization of the radiation power distribution on the radiation exit surface of the illumination device.
  • the radiation source is designed as a separate radiation source.
  • the radiation source is designed as a separate radiation source.
  • Reflector arrangement preferably as a separate arrangement and • not executed integrated in the radiation source. In this way, a large-area, substantially independent of the extent of the radiation source lighting device can be realized in a simplified manner.
  • the radiation source is not to be regarded solely as a laser-active gain medium.
  • Such a lighting device is particularly suitable for, in particular direct, backlighting of a display device, such as a liquid crystal display device (LCD: Liquid Crystal Display), and is therefore preferably provided for this purpose.
  • a direct backlight is in contrast to indirect backlighting an arrangement of
  • Radiation source and the surface to be illuminated in such relative to each other that a main emission of a radiation-generating element of the radiation source directed directly in the direction of the surface to be illuminated.
  • An elaborate radiation deflection from the main emission direction in the direction of the surface to be illuminated can be dispensed with.
  • Radiation source which usually radiates mainly parallel to the surface to be illuminated, generated radiation from the main emission to the surface to be illuminated necessary.
  • the illumination device in particular the reflector arrangement, is preferably designed and / or arranged for the lateral illumination of the radiation exit surface.
  • the illumination device may have a laterally homogeneous specific emission from the radiation exit surface.
  • lateral illumination does not necessarily mean complete illumination of the radiation exit surface.
  • Edge regions of the radiation exit surface need not necessarily be completely illuminated.
  • the illuminated portions of the radiation exit surface are, however, due to the reflector arrangement with preference compared to a similar lighting device, in which the. first reflector layer or the reflector assembly is omitted, simplified homogeneous illumination.
  • the illumination device has a plurality of, in particular separate, radiation sources.
  • the first reflector layer is preferably arranged between the radiation sources and the radiation exit surface.
  • the Lighting device may, for example, 10 or more, preferably 50 or more, more preferably 100 or more, radiation sources.
  • the number of radiation sources expediently depends on the radiation power suitable or required by the radiation exit surface for the respective application. For a uniform illumination of the radiation exit surface, a plurality of radiation sources is advantageously not necessary, so that the number of radiation sources used for a homogeneous illumination of the 1
  • Radiation exit surface is substantially independent of the size of the radiation exit surface.
  • the occurrence of regions on the radiation exit surface or on the side of the first reflector layer facing the radiation sources which are illuminated with increased or reduced radiation power in relation to laterally adjacent regions can be largely suppressed by means of the reflector arrangement.
  • Such areas often occur in lighting devices with a plurality of radiation sources in areas of the radiation exit area, which is arranged in a lateral direction between the radiation sources.
  • an area of increased radiation power may be caused by an overlap of radiation cones of two radiation sources, whereas an area of reduced radiation power may be reduced
  • Radiation power can be caused by a not directly irradiated area.
  • the reflector arrangement both in a not directly irradiated area as Even in an overlap region of two radiation cone, the radiation power distribution on the first reflector layer or the radiation exit surface are homogenized.
  • the first reflector layer covers the second reflector layer completely and / or vice versa in the lateral direction.
  • the lateral beam guidance in the reflector arrangement between the first and the second reflector layer by means of multiple reflection can thus be facilitated.
  • first and the second reflector layer preferably run parallel to one another.
  • the angles of incidence of radiation reflected back and forth between the first reflector layer and the second reflector layer on the respective reflector layer are essentially the same in the case of a parallel arrangement of the reflector layers, whereby a homogeneous illumination of the first reflector layer and accordingly of the radiation exit surface is facilitated.
  • the first reflector layer ⁇ ⁇ covers the radiation source or the radiation sources in the lateral direction. A targeted reflection of the radiation source or the
  • Radiation sources generated, directly radiated in the direction of the reflector layer radiation is facilitated.
  • the reflector arrangement has a side reflector layer, which preferably extends from the first reflector layer to the second reflector layer. Particularly preferably, the side reflector layer extends from the first ⁇
  • the side reflector layer may extend in a vertical direction to a lateral main extension direction of the first reflector layer.
  • a plurality of side reflector layers is provided.
  • a beam space may be formed on which, in particular by means of the reflector arrangement, the radiation power generated by the radiation source or the radiation sources is concentrated.
  • the first and the second reflector layer preferably delimit the beam space in the vertical direction.
  • a plurality of side reflector layers may be provided. The formation of a beam space on which the radiation power generated by the radiation source (s) is concentrated. can be so relieved.
  • the side reflector layer (s) limit (limit) the beam space in the lateral direction.
  • Radiation reflected back and forth between the first and second reflector layers is distributed in the lateral direction. A frequently reflected radiation component could possibly leave the reflector arrangement laterally.
  • the blasting chamber is preferably substantially radiation-tight.
  • the beam space can be limited on all sides by reflective elements, such as the first reflector layer, the second reflector layer and the side reflector layer (s). A radiation density formation of the beam space is thereby simplified.
  • a reflective element or a plurality of reflective elements can be cut out.
  • a recess of this type is preferably designed such that the
  • the recess expediently has a correspondingly small lateral extent which, for example, is adapted to the lateral extent of the radiation source.
  • the radiation source can adjoin an edge of the recess for this purpose, and preferably terminate flush with the recess on the circumference.
  • the side reflector layer is preferably substantially perpendicular to the first reflector layer and / or the second reflector layer.
  • a laterally homogeneous illumination of the radiation exit surface can be simplified in this way.
  • Reflection on the side reflector layer between the first and the second reflector layer reflected back and reflected radiation on the first and the second reflector layer can be kept the same, in particular in a parallel arrangement of the first and the second reflector layer, simplified. - -
  • the side reflector layer is connected to the first reflector layer and / or the second reflector layer, or the side reflector layer is arranged on the first and / or the second reflector layer. A radiation density of the beam space can be facilitated.
  • the first reflector layer, the second reflector layer and / or the side reflector layer has a reflectivity of 90% or greater, preferably of 95% or greater, more preferably of 98% or greater.
  • the concentration of radiation power on the side of the first reflector layer facing away from the radiation exit surface can thus be facilitated.
  • Such reflectivities are suitable for the formation of a radiation exit side homogeneous distribution of the radiation power.
  • a reflectivity of 98% or greater has proven to be particularly advantageous. Since radiation is to pass through the first reflector layer, the first
  • Reflector layer advantageously has a reflectivity of less than 100%.
  • the second reflector layer and / or the side reflector layer may have a reflectivity of up to 99.9%, preferably 100%.
  • the reflectivity of the second reflector layer and / or the reflectivity of the side reflector layer is greater than the reflectivity of the first reflector layer.
  • a radiation exit from the beam space outside the first reflector layer can thus be suppressed in a simplified manner.
  • the whole of the Illuminating device generated by the radiation source or the radiation sources radiation power preferably exits through the first reflector layer from the beam space.
  • an additional reflector layer is arranged on the side of the second reflector layer opposite the first reflector layer.
  • the additional reflector layer which preferably runs parallel to the second reflector layer, radiation passing through the second reflector layer can be reflected again in the direction of the second reflector layer.
  • the second reflector layer of the beam passing area 'radiation can thus simplifies again coupled into the beam space and the reflection are fed by the first reflector layer.
  • Such an additional reflector layer may optionally also find application in the side reflector layer (s). Due to the formation of a reflector layer structure with a plurality of reflector layers, the formation of the. respective reflector layer as a single layer with a respect to the reflectivity ⁇ the first reflector layer specifically increased reflectivity are omitted, the reflector layer structure preferably has a correspondingly increased relative to the reflectivity of the first reflector layer overall reflectivity.
  • the first reflector layer, the second reflector layer and / or the side reflector layer contains a metal or the respective layer is metallic, for example as a metallization or metal foil.
  • a metal-containing reflector layer is characterized by a largely of the impact angle independent reflectivity, which is particularly advantageous for laterally homogeneous illumination.
  • An alloy-based reflector layer may also be suitable for this purpose.
  • the respective reflector layer may, for example, be applied as a metallization to a carrier body, e.g. vapor-deposited, or be applied as a reflector film, in particular metal foil, on the support body, e.g. be laminated.
  • the carrier body stabilizes the reflector layer with preference mechanically and can be designed as a light guide or a separate carrier element.
  • the carrier body is preferably arranged between the first and the second reflector layer.
  • the carrier body preferably does not essentially serve the purpose of guiding the beam, but simplifies the production of the reflector arrangement, since an application of the respective reflector layer on the carrier body with respect to a separate structure of the reflector arrangement with a
  • Reflector layer (s) mechanically supporting carrier body facilitates. becomes.
  • a carrier body may be arranged, for example, on the side of the respective reflector layer facing away from the beam space or facing the beam space.
  • the radiation exit surface, the first reflector layer, the second reflector layer and / or the side reflector layer are planar, in particular non-curved.
  • Lighting device is particularly suitable for the homogeneous illumination of a flat, in particular parallel to the radiation exit surface extending surface.
  • the ratio of the irradiation intensity on the first reflector layer to the specific radiation on the radiation exit surface is 0.2 or less, preferably 0.1 or less, particularly preferably 0.05 or less.
  • the ratio of the irradiance and the specific radiation on mutually overlapping surface areas of the first reflector layer and the radiation exit area can assume such values.
  • the irradiance and the specific radiation behave over substantially the entire lateral extent of the radiation exit surface accordingly.
  • the radiation power generated by the radiation source or the radiation sources is thus preferably concentrated on the side of the first reflector layer facing the radiation source or the radiation sources.
  • the radiation power passing through the first reflector layer is in this case advantageously homogeneously distributed laterally.
  • the lighting device is expediently designed such that the radiation power passing through the first reflector layer is sufficient for the respective application.
  • the reflectivity of the first reflector layer or the number of radiation sources can for this purpose be adjusted accordingly ⁇ . It is important to ensure that the reflectivity of the first reflector layer is large enough to ensure a homogeneous illumination of the radiation exit surface.
  • the first reflector layer, the second reflector layer and / or the Side reflector layer made in one piece. An interface between individual reflector layer pieces for the respective reflector layer with a resulting increased risk of leakage losses or undirected reflection in the region of the interfaces between reflector layer pieces can thus be avoided.
  • the first reflector layer, the second reflector layer and / or the side reflector layer is designed as a continuously reflecting, preferably uninterrupted, layer. A reduced, in particular in the range of an interruption, reduced reflectivity of the respective reflector layer is thereby avoided.
  • the first reflector layer, the second reflector layer and / or the side reflector layer have a uniform, preferably constant, reflectivity over their extent. A uniform reflection in substantially all areas of the respective reflector layer is facilitated.
  • the lateral extent of the first reflector layer and / or the second reflector layer is greater than the vertical extent of the
  • Lighting device can be achieved so simplified.
  • the surface area of the first reflector layer and / or the second reflector layer is greater than that of the side reflector layer or larger than that of each of the side reflector layers or that of the side reflector layers as a whole. A small, compact design of the lighting device with a large radiation exit surface is thus further facilitated.
  • the second reflector layer a recess or a plurality of recesses.
  • the recess is formed or provided as a passage opening for radiation through the second reflector layer or as an insertion opening for the introduction of a radiation source.
  • the radiation source can be arranged in a simplified manner on the side of the second reflector layer facing away from the first reflector layer.
  • the radiation generated by this element can pass through the recess without reflection on the second reflector layer through the region of the second reflector layer and impinge on the first reflector layer.
  • a plurality of radiation sources associated with a common recess Radiation generated by a plurality of radiation sources thus passes through a common recess through the region of the second reflector layer.
  • a radiation source is in each case assigned its own, discrete recess.
  • the recess can thus be simplified ⁇ on the respective radiation source are shaped to match.
  • Radiation sources the individual radiation sources often, e.g. montage employment, spaced apart from each other must be arranged so that the surface of the recess relative to the radiation passage alone required surface in this case is often increased. The not to
  • Radiation passage needed, but still recessed area increases the probability of radiation passage through the second reflector layer after reflection at the first reflector layer. Such penetrating radiation can be lost for the illumination. Compared with discrete recesses for each radiation source, however, a common recess for a plurality of radiation sources can, if appropriate, be manufactured in a simplified manner.
  • the radiation source engages or engages the plurality of radiation sources in the recess or the plurality of recesses.
  • a small and compact lighting device can be realized in a simplified manner.
  • a leakage of radiation from the beam space, which is caused by the passage of radiation through the recess on the side facing away from the first reflector layer side of the second • reflector layer can, by coordinated design of the recess and. the engaging radiation source can be reduced with advantage. For example, an edge of the recess frictionally with complete the radiation source.
  • the radiation source has an outcoupling surface through which the radiation generated in the radiation source leaves the radiation source.
  • these have, in particular in each case, an outcoupling surface through which the radiation generated in the radiation sources leaves the radiation sources.
  • the decoupling surface or a plurality of decoupling surfaces is arranged between the first reflector layer and the second reflector layer. Radiation can therefore be coupled out of the radiation source between the first and second reflector layer.
  • the decoupling surface can be guided, for example, through the recess in the second reflector layer through the second reflector layer.
  • a radiation-generating element of the radiation source can be arranged on the opposite side of the first reflector layer of the second reflector layer.
  • the decoupling surface may be arranged on the side of the second reflector layer facing the first reflector layer.
  • the Auskoppelflache concludes with the second reflector layer or is spaced from the second reflector layer disposed between the first and the second reflector layer. This way, in the
  • the decoupling surface may be arranged on the side of the second reflector layer facing away from the first reflector layer.
  • the generated radiation of the first reflector layer can be supplied through a recess of the second reflector layer for reflection.
  • Such an arrangement may be easier to implement as compared with the above arrangement.
  • the overall depth of the lighting device is, however, increased compared to the above arrangement.
  • the radiation source generates or generates a plurality of radiation sources between the first and the second
  • Reflector layer radiation A radiation-generating element of the radiation source can thus be arranged between the first and the second reflector layer. The formation of a small and compact lighting device is thus facilitated.
  • the second reflector layer, on which the radiation source is preferably arranged in this case, also serve for the electrical contacting of the radiation source.
  • the reflector layer is preferably made electrically conductive or provided with electrically conductive contact structures for electrical contacting of the radiation source.
  • a distance of the outcoupling surface or a plurality of outcoupling surfaces to the radiation exit surface and / or the first reflector layer is 5 mm or less, preferably 2 mm or less, particularly preferably 1 mm or less.
  • the decoupling surface relative to the first reflector layer is to ensure that the incident obliquely to the surface normal of the first reflector layer radiation component is not unnecessarily reduced.
  • a reduction in this angularly incident radiation component would entail an increase in the number of reflections at the first and the second reflector layer which are required for the lateral homogeneous illumination of a surface of predetermined size.
  • this distance is - Anlagenr or equal to '0.7 mm.
  • the radiation source is provided for generating visible radiation.
  • the radiation source is designed as a radiation emission diode or a plurality of radiation sources is designed as a radiation emission diode.
  • Radiation emission diode is particularly suitable as a radiation source due to the compared to conventional radiation sources such as incandescent bulbs or fluorescent tubes smaller footprint and long life for a compact lighting device.
  • the radiation emitting diode may be an organic radiation generating element such as an OLED (Organic Light Emitting diode), or an inorganic radiation generating element, preferably a semiconductor chip, for example, a semiconductor chip based on III-V semiconductor material, as in an LED (light emitting diode) include.
  • III-V semiconductor materials are particularly suitable for a semiconductor chip of the BeieuchtungsVorraum due to the high achievable internal quantum efficiency.
  • the radiation emission diode is preferably in the form of an optoelectronic, in particular surface mountable,
  • SMT Surface mounting technology
  • radiation generated in the radiation source occurs, in particular before the first impact on the first reflector layer, by an optical element, e.g. a lens, through.
  • the optical element is preferably arranged between the first reflector layer and the radiation-generating element of the radiation source.
  • the radiation generated in the radiation source can be formed by the radiation exit side of the optical element in accordance with a predetermined emission characteristic.
  • the optical element can be designed such that 1 illuminates by means of the radiation source
  • the optical element widens the emission characteristic of the radiation source with respect to a radiation characteristic of the radiation source without a provided optical element. As a result, the area of the first reflector layer directly illuminated by the radiation source is advantageously increased.
  • discrete optical elements each associated with a single radiation source are particularly suitable.
  • the surface of the optical element has, on the radiation exit side, in particular on the side facing the first reflector layer, a concavely curved partial region and a concavely curved partial region, in particular laterally surrounding, convexly curved partial region.
  • Subarea is preferably spaced from the optical axis.
  • the optical element in particular its optical functional surfaces, preferably designed rotationally symmetrical to the optical axis.
  • a broadening of the emission characteristic in particular symmetrical, can be achieved in a simplified manner, wherein the irradiation intensity is advantageously homogeneously distributed laterally on the surface to be illuminated, in particular flat.
  • the distance between the Auskoppelflache the Strahlu ⁇ gsario of the first reflector layer can be kept advantageously low due to the broadening of the radiation characteristic of the radiation source by means of the optical element with a uniform homogeneous illumination of the first reflector layer.
  • the optical element is attached to the radiation source as a separate optical element.
  • the decoupling surface of the radiation source can in this case be formed by a radiation exit surface of the optical element.
  • the beam shaping by means of the optical element then takes place in advantageous proximity to the radiation-generating element of the radiation source.
  • the optical element can, for example, be glued to the radiation source or, for example, plugged onto the radiation source by means of a plurality of dowel pins, preferably provided on the optical element.
  • FIG. 1 shows a first embodiment of a lighting device according to the invention with reference to a schematic sectional view
  • FIG. 2 shows a schematic sectional view of a second exemplary embodiment of a lighting device according to the invention
  • FIG. 3 shows a particularly advantageous arrangement of radiation sources for a lighting device
  • Figure 4 shows a schematic sectional view of a third embodiment of a lighting device according to the invention and ' .
  • FIG. 5 shows a schematic sectional view of a fourth exemplary embodiment of a lighting device according to the invention.
  • FIG. 1 shows a first exemplary embodiment of a lighting device 10 according to the invention on the basis of a schematic sectional view.
  • the lighting device 10 comprises a reflector arrangement having a first reflector layer 1 and a second reflector layer 2 and a plurality of
  • Radiation sources In the exemplary embodiment according to FIG. 1, a first radiation source 3 and a second radiation source 4 of the illumination device are shown. It may also be provided deviating, about larger, number of radiation sources. The number of
  • Radiation sources that are used in the lighting device expediently depends on the radiation power required for the respective application or, in the appropriate photometric quantity that takes into account the sensitivity of the human eye, according to the required luminous flux.
  • the lighting device 10 has a
  • the first reflector layer 1 is arranged between the radiation exit surface 5 and the radiation sources 3 and 4.
  • the radiation exit surface 5 may be given, for example, by the surface of the first reflector layer 1 facing away from the radiation sources.
  • the surface of a radiation element facing away from the surface of a remote from the radiation source side of the first reflector layer element of the lighting device form the radiation exit surface.
  • the second reflector layer 2 is arranged on the side of the first reflector layer 1 opposite the radiation exit surface 5. ⁇
  • the course of radiation generated in the radiation sources in the illumination device is illustrated in FIG. 1 by way of example with reference to the beam paths of the radiation components 81, 82 and 83 generated by the first radiation source 3.
  • the radiation cone of the radiation sources is limited in each case by the corresponding lines 7 indicated by dashed lines.
  • the radiation cones of the first radiation source 3 and of the second radiation source 4 in this case overlap on the first reflector layer 1. Despite the overlap on the first reflector layer 'a homogeneous radiation power distribution can be achieved on the radiation exit side by means of reflection of radiation at the first and the second reflector layer. The same applies to spaced, non-overlapping radiation cone.
  • a radiation component 81 leaving the first radiation source 3 via its outcoupling surface 6 strikes, in particular directly and / or obliquely, the first reflector layer 1 and passes through it.
  • a further radiation component 82 of the radiation generated by the first radiation source 3 obliquely strikes the first reflector layer 1 and is reflected there. After this reflection, the radiation component 82 strikes the " second reflector layer, where it is again reflected in the direction of the first reflector layer, strikes it and passes through the first reflector layer 1.
  • Reflector layer is laterally spaced from a second impingement point 99 of this radiation component on the first reflector layer.
  • the second impingement point 99 is in particular laterally further away from the radiation source 3 than the first impingement point 9.
  • Radiation generated by the radiation sources radiates through the first reflector layer, possibly after multiple reflections at the first and the second reflector layer, thus partially. This is part of the
  • Radiation source generated, striking the first reflector layer luminous flux per square meter of Auf Economicsflache on the first reflector layer - are achieved on the radiation sources facing side of the first reflector layer 1.
  • regions of the first reflector layer that are not directly illuminated by the radiation source 3 can also be illuminated via, if appropriate, multiple reflection on the first and / or the second reflector layer. The same 'is true of the second from the radiation source
  • the radiation power which has passed through the first reflector layer is advantageously distributed homogeneously on the radiation exit surface 5.
  • the illumination device can thus be distinguished by a specific, specifically distributed, lateral, homogenous light emission, indicated in lumens of the luminous flux emerging from the illumination device per square meter of the exit surface.
  • the occurrence of islands (hotspots) of increased radiation power on the radiation exit surface 5 can be avoided in a simplified manner by means of the reflector arrangement.
  • the illumination of a surface to be illuminated by means of the illumination device can have a substantially laterally constant illuminance. be achieved in a simplified manner.
  • the first reflector layer 1 and the second reflector layer 2 completely overlap each other in the lateral direction.
  • the first reflector layer 1 also covers the radiation sources in the lateral direction.
  • the first and the second reflector layer also preferably run parallel to one another.
  • a beam space 11 is formed and preferably limited in the vertical direction. In the lateral direction, i. In the main extension direction of the first reflector layer, the beam space 11 is bounded by one or a plurality of side reflector layers 12. Radiation power generated by the radiation sources can be detected by means of the first and second reflector layer and the
  • the beam space is preferably formed substantially radiation-tight, that is, radiation generated by the radiation sources leaves the beam space substantially only over the space provided for this, which is given in the present embodiment by the first reflector layer 1 ' .
  • the side reflector layers 12 prevent a lateral, lateral outcoupling of radiation from the beam space 11.
  • the radiation portion 83 which is first reflected by the first reflector layer 1, then hits the side reflector layer 12 and from this in turn is reflected in the direction of the second reflector layer 2, illustrated. If the side reflector layer 12 were omitted, the radiation component 83 would leave the beam space 11. This would mean an undesirable reduction in radiant power in the beam space and, accordingly, radiation power exiting via the radiation exit surface 5.
  • the second reflector layer 2 in turn reflects the radiation component 83 in the direction of the first reflector layer 1.
  • the radiation component 83 can either be further reflected on it or pass through the first reflector layer 1.
  • the side reflector layers 12 preferably extend in the vertical direction from the first reflector layer 1 to the second reflector layer 2. Particularly preferably, the side reflector layer is perpendicular to the first and the second reflector layer.
  • the side reflector layers 12 are furthermore preferably arranged or attached directly to the first and / or the second reflector layer. The formation of a light-tight beam space 11 is thus facilitated.
  • the individual reflector layers for example by means of an adhesive bond, be connected.
  • the first reflector layer 1, the second reflector layer 2 and the side reflector layers 12 preferably have one
  • these reflector layers preferably contain a metal or are metallic. So that the predominant radiation fraction exits via the first reflector layer have the second reflector layer and the
  • Side reflector layers preferably have a greater reflectivity than the first reflector layer, for example up to 10%.
  • the first reflector layer 1 and the side reflector layer (s) is (are) preferably carried out continuously and continuously reflecting.
  • these reflector layers have a reflectivity that is substantially constant over their extent, so that regardless of the point of impact of radiation on the first reflector layer, constant portions of radiation are reflected and constant proportions of radiation power can pass through the first reflector layer.
  • the first reflector layer is preferably arranged on a first carrier element 13, the second reflector layer on a second carrier element 14 and / or the side reflector layer (s) 12 are (are) arranged and / or fixed on third carrier elements 15.
  • each side reflector layer 12 is assigned a discrete carrier element 15.
  • the carrier elements 13, 14 and 15 may for example form part of a housing of the lighting device. The respective ones
  • Reflector layers can be applied to the respective carrier elements, for example adhesively bonded, laminated or vapor-deposited.
  • the first carrier element 13 of the first reflector layer 1 is preferably arranged on the side of the first reflector layer facing away from the radiation sources 3 and 4.
  • the first carrier element 13 is expediently radiation permeable formed for the radiation generated by the radiation source.
  • the first carrier element for further homogenization of the ⁇ radiant power distribution of the passing through the 'support member through radiation as a diffuser element, such as a diffuser plate, for example of Plexiglas, be formed.
  • the second or third carrier element since it does not essentially serve for the radiation exit or the respectively supported reflector layer is highly reflective, can be designed to be absorbent.
  • the ratio of the illuminance on the side of the first reflector layer 1 facing the radiation sources to the specific light emission on the radiation exit surface is 0.2 or less, preferably 0.1 or less, particularly preferably 0.05 or less. This can be achieved by the above-mentioned high reflectivities, in particular greater than or equal to 98%.
  • the illumination arrangement formed particularly compact due to the lateral distribution of the radiation power by means of the reflector assembly can be.
  • the, lighting device is cuboid.
  • the second reflector layer 2 which is preferably formed in one piece, has a plurality of recesses 16 into which the radiation sources 3, 4 engage.
  • the radiation sources can engage in the recess such that the coupling-out surfaces 6 of the radiation sources terminate with the surface of the second reflector layer facing the first reflector layer. This ensures that substantially all of the radiation leaving the radiation source is between the first and the second radiation source
  • the number of recesses 16 preferably corresponds to the number of radiation sources, so that reflection losses due to the passage of radiation through a recess not occupied by a radiation source are avoided.
  • Recesses 16 preferably also extend through the second support element 14 carrying the second reflector layer.
  • a radiation source is assigned in each case its own, discrete recess.
  • the recesses are preferably adapted to the radiation sources such that the radiation sources terminate laterally with the respective recess, for example by frictional engagement.
  • an additional reflector layer may be arranged.
  • Additional reflector layer is not explicitly shown in Figure 1, but can be between the illustrated Reflector layers and the respective carrier element may be arranged.
  • a reflector layer structure comprising the respective reflector layer - side reflector layer (s) or second reflector layer - and a corresponding additional reflector layer
  • the first reflector layer can be used so simplified similar single reflector layers, wherein when forming the first reflector layer on a
  • Additional reflector layer can be dispensed with, so that a radiation exit over the first reflector layer is made possible in a simplified manner.
  • Radiation sources 3 and 4 of the first reflector layer 5 mm or less are preferably 2 mm or less, about 1 mm or less. The formation of a small and compact lighting device is thus facilitated. A distance greater than 0.7 mm is further particularly preferred.
  • the radiation sources 3 and 4 of the illumination device 10 are preferably designed as radiation emission diodes.
  • the radiation emission diodes are particularly preferably designed as light emission diodes for generating visible radiation.
  • the radiation emission emission diodes preferably each have a semiconductor chip 17 provided for generating radiation. This semiconductor chip can in a cavity 18 of a housing body 19, for example, containing a plastic, a
  • Radiation emission diode component 20 may be arranged. Furthermore, the semiconductor chip is preferably embedded in a cladding 21, for example containing a resin or a silicone, which protects it from harmful external influences.
  • a surface mount radiation emission diode device is particularly suitable for a small and compact illumination device. An illustration of the electrical connections of the radiation emission diodes has been omitted in FIG. 1 for reasons of clarity.
  • the radiation sources can be arranged on a radiation source carrier 22 which mechanically stabilizes the radiation sources with preference.
  • Radiation source carrier can in particular form the rear wall of a housing of the lighting device.
  • radiation emission diode components of the radiation source carrier is preferably designed as a printed circuit board, which can serve the electrical contacting of the components.
  • the radiation source carrier 22, unlike that shown, can also be arranged directly on the second carrier element 14 or, if appropriate, attached thereto.
  • surface mounted radiation emission diode components are
  • semiconductor chips may also be mounted directly on the second reflector layer, which is then preferably embodied as electrically conductive and particularly preferably as a chip carrier, for illumination of the first reflector layer, and may be electrically contacted by means of the second reflector layer.
  • ⁇ radiation is generated between the first and the second reflector layer.
  • the source of the current can be in
  • Radiation generated in the radiation sources 3 and 4 occurs, in particular before the, preferably direct or initial, impact, on the first reflector layer 1 of the reflector arrangement through an optical element 23 therethrough.
  • the optical element 23 can ⁇ be formed for example by suitable shaping of the sheath 21 as exemplified at the radiation source 3, in the diode integrated or the optical element may, as shown by way of example in the radiation source 4, as a separate optical element on one
  • Radiation emission diode component arranged and / or attached to this.
  • the optical element can for example be plugged or glued onto the radiation emission diode.
  • corresponding fastening devices are preferably formed in the housing body and / or on the optical element. These are not explicitly shown for reasons of clarity.
  • a radiation source which is particularly suitable for the illumination device and has an optical element which can be attached to a radiation emission diode and which is particularly suitable for broadening the emission characteristic of the radiation emission diode and homogenous illumination is described in greater detail in patent application DE 10 2005 020 908.4, the disclosure of which is hereby incorporated by reference this patent application is incorporated.
  • this radiation emission diode has a separate thermal connection part, which is separated from the electrical connection parts, for example, to a heat sink, connectable to.
  • this radiation emitting diode is particularly suitable for lighting applications.
  • radiation emission diodes are further components with the following type designations of the manufacturer Osram Opto Semiconductors GmbH or related components as
  • Radiation source suitable for a lighting device LB A670, LB W5SG.
  • This component is particularly suitable for high to be generated
  • a optical element can be easily fixed, e.g., plugged, for example, by means of dowel pins provided on the optical element.
  • the surface of the optical element 23, which is embodied, for example, as a lens, preferably has a concavely curved partial region 230 on the radiation exit side, through which an optical axis 231 particularly preferably extends.
  • the optical axis 231 furthermore preferably runs through the radiation source, in particular the semiconductor chip 17.
  • the optical element 23, in particular the radiation exit area has, furthermore preferably 'a the concavely curved subregion, in particular at a distance to the optical axis 231, laterally surrounding, in particular peripheral, convexly curved portion 232.
  • Radiation exit surface of the optical element is preferably the decoupling surface 6 of the radiation source.
  • the emission characteristic of the radiation source can advantageously be widened with respect to the unmodified emission characteristic of the radiation-generating element of this radiation source, for example of the semiconductor chip.
  • the curved shaping of the radiation exit surface radiation is refracted away from the optical axis on the radiation exit side.
  • the region of the first reflector layer which is directly illuminated by means of the radiation source is advantageously enlarged at a predetermined distance of the radiation exit surface of the optical element from the first reflector layer.
  • the radiation source can advantageously be arranged closer to the first reflector layer due to the broadening of the emission characteristic by the optical element. Radiation thus increasingly encounters the surface normal of the first reflector layer at large angles to it. This results in an increased reflection at relatively large angles at the first reflector layer, whereby a lateral 'homogeneous illumination can be achieved in a simplified manner.
  • the optical element 2-3 is preferably designed such that the illuminance on the means of Radiation source illuminated portion of the, in particular planar, first reflector layer 1 is laterally distributed homogeneously.
  • the optical element 23 is particularly preferably rotationally symmetrical with respect to the optical axis 231.
  • the optical axis 231 preferably runs parallel to the surface normal of the first reflector layer. A homogeneous direct illumination of the first reflector layer 1 is facilitated.
  • the lighting device can be realized both small and compact.
  • a lighting device facilitates the homogeneous homogeneous illumination of a surface to be illuminated, the part of the
  • Radiation exit surface is arranged.
  • Such a device can be used for example for display devices with a surface diagonal of up to 57 ''. Also display devices with a larger area diagonals, in particular the
  • Radiation exit surface can be simplified by means of the lighting device and in particular made compact.
  • a layer structure 24 may be arranged.
  • a layer stack is also called a brightness enhancement film (BEF) because the brightness perceived by an observer in the vicinity of the surface normal is increased by means of the layer structure. The contrast can be increased.
  • a D-BEF Double-BEF is particularly suitable as a brightness enhancement film.
  • the layer structure 24 preferably comprises a plurality of
  • Radiation generated by the radiation source passing through the first reflector layer impinges, preferably after passing through the first carrier element and / or the layer structure 24, to a backlighted display device 25, for.
  • a backlighted display device 25 for.
  • FIG. 2 shows a schematic sectional view of a second embodiment of a lighting device according to the invention.
  • the embodiment according to FIG. 2 corresponds to that shown in FIG.
  • the radiation source carrier 22 is arranged directly on the second carrier element 14 and preferably fixed.
  • the illumination device has a plurality of beam units 30, which in each case in each case, in turn, a plurality of radiation sources include.
  • a jet unit 30 in this case has a first radiation source 3, a second radiation source 4 and a third radiation source 26.
  • the radiation sources of a jet unit produce with preference, in particular in pairs, different colored radiations.
  • the first radiation source 3 generates radiation in the red spectral range
  • the second radiation source 4 generates radiation in the green spectral range
  • the third radiation source 26 generates radiation in the blue spectral range.
  • a jet unit can also generate mixed-color radiation, in particular white light, during simultaneous operation of a plurality of radiation sources.
  • mixed-color radiation in particular white light
  • An explicit representation of the beam path was omitted in FIG.
  • the radiation sources of a jet unit are preferably arranged laterally next to each other, in particular grouped.
  • the distance between the decoupling surfaces 6 of the radiation sources from the first reflector layer 1 may be, for example, 3.5 mm.
  • the first support member 13 may be, for example, as, e.g. 3 mm thicker, diffuser, made of Plexiglas, for example.
  • the distance between the first reflector layer 1 and the second reflector layer 2 may be, for example, 5 mm.
  • the third support elements 15, which preferably determine this distance or are formed as spacers, are accordingly, e.g. with a height of 5 mm, executed.
  • the reflector layers for example, each have a reflectivity of 98%.
  • the total thickness of such a lighting device 10 can
  • a luminance can be achieved on the radiation exit side which corresponds to a luminance that is suitable for ⁇ .
  • cuboid-shaped test lighting device comprising a rectangular in plan radiation exit surface with the dimensions 100 mm * 120 -mm and two at a distance of 70 mm on a diagonal of a base of the cuboid arranged radiation emission diodes , could radiation side a very homogeneous
  • Radiation power distribution can be achieved.
  • the individual light sources were no longer distinguishable on the exit side.
  • FIG. 3 shows schematically an arrangement of the radiation sources of a jet unit which is particularly advantageous for a lighting device.
  • the beam unit 30 preferably comprises a first radiation source 3. a second radiation source 4, a third radiation source 26, and a fourth radiation source 27.
  • the radiation sources are preferably designed as radiation emission diodes.
  • the radiation in the radiation sources is preferably generated by means of optoelectronic semiconductor chips.
  • Radiation source 4 is preferably designed for generating radiation in the red spectral range, the radiation sources 3 and 26 in the green spectral range and the radiation source 27 for generating radiation in the blue spectral range.
  • Two radiation sources of a radiation unit can therefore be designed to produce the same color radiation, in particular radiation of the same peak wavelength, for example green radiation.
  • a BeieuchtungsVorraum in particular a flat lighting device, a diamond-like arrangement of the four radiation sources of the jet unit has been found to be particularly suitable.
  • Adjacent radiation sources preferably each have, apart from the radiation sources 3 and 26, the same distance a. This arrangement is particularly suitable for generating homogeneous mixed-color light by means of the beam unit for illuminating the first reflector layer. A distance a of about 10 mm has proven to be particularly advantageous.
  • the illumination device preferably comprises a plurality of beam units, wherein individual beam units are particularly preferably arranged on grid points of a two-dimensional hexagonal grid.
  • the individual radiation sources are preferably arranged grouped around the respective grid point.
  • FIG. 4 shows a schematic sectional view of a third exemplary embodiment of a lighting device according to the invention.
  • the exemplary embodiment according to FIG. 4 essentially corresponds to that shown in FIGS. 1 and 2, whereby beam units 30 whose radiation sources can generate differently colored radiation are also used here (compare also FIGS. 2 and 3).
  • the carrier elements 13, ' In contrast to the preceding figures, in the exemplary embodiment according to FIG. 4 the carrier elements 13, '
  • an optical waveguide 28 is also arranged between the first reflector layer 1 and the second reflector layer 2.
  • the beam space 11 can essentially be formed by the light guide 28.
  • the first reflector layer 1, the second reflector layer 2 and / or the side reflector layers 12 are preferably arranged or formed on the corresponding surfaces of the light guide.
  • this can be a metallization, such as by vapor deposition, be formed on the light guide 28 or a mirror film laminated to the light guide.
  • a diffuser element 29 is arranged on the radiation sources 3, 4 and 26 facing away from the first reflector layer.
  • the diffuser element preferably has no mechanically supporting function for the first one
  • the light guide which is arranged between the first and the second reflector layer, the first reflector layer and preferably also carry the other reflector layers.
  • a recess 31 can be formed in the light guide, into which the outcoupling surface 6 of the. each radiation source can intervene. Prefers For each radiation source one, in particular discrete, such recess 31 is formed.
  • the recesses can be preformed in the light guide body, for example in the production of the light guide, for example by injection molding.
  • a refractive index adjustment material such as a silicone gel
  • Reflection losses in the passage of radiation from the recess in the light guide on the light guide can be reduced.
  • the refractive index matching material advantageously reduces the refractive index jump between the material in the recess, such as air, and the material of the light guide or optical element. This preferably has
  • Refractive index matching material has a refractive index between the side adjacent to the decoupling material and the material of the optical fiber. Further, the refractive index matching material preferably adjoins the outcoupling surface and the light guide. The clearance may be substantially completely filled with the refractive index matching material.
  • Figure 5 shows a schematic sectional view of a fourth embodiment of an inventive
  • FIG. 5 corresponds to that shown in FIG.
  • a reflector element 32 is arranged and / or formed on the side of the recess 31 opposite the coupling-out surface 6, in particular in each case.
  • the cross-section of the reflector element 32 preferably tapers in the direction of the light guide
  • the reflector element is arranged symmetrically to the optical axis 231 of the optical element 23.
  • the reflector element 32 may be provided, for example, with a reflection-enhancing material, e.g. a metal, be coated.
  • the reflector element 32 has a substantially triangular cross-section.
  • the radiation which leaves the radiation source via the outcoupling surface 6 may optionally be distributed in the lateral direction in addition to beam shaping in the optical element 23. This is illustrated by the radiation component 84 whose angle to the optical axis 231 is increased by reflection at the reflector element.
  • the Auf Economicsflache of radiation on the first reflector layer can be increased.
  • a large-area radiation power distribution on the first reflector layer can be achieved in a simplified manner.
  • the reflector element is preferably spaced from the Auskoppelflache 6. Already sufficiently large angles to the optical axis having radiation components can be made so simplified without reflection on the reflector element to the first reflector layer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage (10) comprenant une surface de sortie de rayonnement (5), un système réfléchissant qui présente une première couche réfléchissante (1) et une seconde couche réfléchissante (2), ainsi qu'une source de rayonnement (3, 4, 26, 27). La première couche réfléchissante (1) se trouve entre la surface de sortie de rayonnement (5) et la source de rayonnement (3, 4, 26, 27). Le rayonnement produit par la source de rayonnement traverse partiellement la première couche réfléchissante (1). La seconde couche réfléchissante (2) se trouve sur la face opposée à la surface de sortie de rayonnement (5) de la première couche réfléchissante (1).
EP06775850A 2005-09-30 2006-08-14 Dispositif d'eclairage Withdrawn EP1929200A1 (fr)

Applications Claiming Priority (3)

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DE102005047154 2005-09-30
DE102005061208A DE102005061208A1 (de) 2005-09-30 2005-12-21 Beleuchtungsvorrichtung
PCT/DE2006/001421 WO2007036185A1 (fr) 2005-09-30 2006-08-14 Dispositif d'eclairage

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EP1929200A1 true EP1929200A1 (fr) 2008-06-11

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EP (1) EP1929200A1 (fr)
JP (1) JP2009510678A (fr)
KR (1) KR20080066750A (fr)
DE (1) DE102005061208A1 (fr)
TW (1) TW200722681A (fr)
WO (1) WO2007036185A1 (fr)

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KR20080066750A (ko) 2008-07-16
WO2007036185A1 (fr) 2007-04-05
DE102005061208A1 (de) 2007-04-12
US20080198597A1 (en) 2008-08-21
TW200722681A (en) 2007-06-16

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